Bump version: 6.2 → 6.3

.bumpversion.cfg

@@ -1,7 +1,7 @@
 [bumpversion]
 commit = True
 tag = True
-current_version = 5.54
+current_version = 6.3
 parse = (?P<major>\d+)\.(?P<minor>\d+)
 serialize = 
 	{major}.{minor}

.github/workflows/docker-alpine-image.yaml

@@ -66,7 +66,7 @@ jobs:
         uses: docker/build-push-action@v3
         with:
           context: .
-          platforms: linux/arm64,linux/amd64,linux/arm/v7
+          platforms: linux/arm64,linux/amd64,linux/arm/v6,linux/arm/v7
           file: pkg/docker/Dockerfile.alpine
       -
         name: Push

.gitignore

@@ -7,7 +7,7 @@
 /python/ustreamer.egg-info/
 /janus/build/
 /ustreamer
-/ustreamer-dump
+/ustreamer-*
 /config.mk
 vgcore.*
 *.sock

Makefile

@@ -36,7 +36,9 @@ endif
 
 apps:
 	$(MAKE) -C src
-	$(ECHO) ln -sf src/*.bin .
+	for i in src/*.bin; do \
+		test ! -x $$i || ln -sf $$i `basename $$i .bin`; \
+	done
 
 
 python:
@@ -69,9 +71,8 @@ install-strip: install
 
 
 regen:
-	tools/$(MAKE)-jpeg-h.py src/ustreamer/data/blank.jpeg src/ustreamer/data/blank_jpeg.c BLANK
-	tools/$(MAKE)-ico-h.py src/ustreamer/data/favicon.ico src/ustreamer/data/favicon_ico.c FAVICON
-	tools/$(MAKE)-html-h.py src/ustreamer/data/index.html src/ustreamer/data/index_html.c INDEX
+	tools/make-ico-h.py src/ustreamer/data/favicon.ico src/ustreamer/data/favicon_ico.c FAVICON
+	tools/make-html-h.py src/ustreamer/data/index.html src/ustreamer/data/index_html.c INDEX
 
 
 release:
@@ -118,7 +119,7 @@ clean-all: linters clean
 
 clean:
 	rm -rf pkg/arch/pkg pkg/arch/src pkg/arch/v*.tar.gz pkg/arch/ustreamer-*.pkg.tar.{xz,zst}
-	rm -f *.bin *.so
+	rm -f ustreamer ustreamer-* *.so
 	$(MAKE) -C src clean
 	$(MAKE) -C python clean
 	$(MAKE) -C janus clean

README.md

@@ -85,13 +85,13 @@ Without arguments, ```ustreamer``` will try to open ```/dev/video0``` with 640x4
 
 :exclamation: Please note that since µStreamer v2.0 cross-domain requests were disabled by default for [security reasons](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS). To enable the old behavior, use the option `--allow-origin=\*`.
 
-The recommended way of running µStreamer with [Auvidea B101](https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=120702&start=400#p1339178) on Raspberry Pi:
+The recommended way of running µStreamer with [TC358743-based capture device](https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=120702&start=400#p1339178) on Raspberry Pi:
 ```
 $ ./ustreamer \
     --format=uyvy \ # Device input format
     --encoder=m2m-image \ # Hardware encoding on V4L2 M2M driver
     --workers=3 \ # Workers number
-    --persistent \ # Don't re-initialize device on timeout (for example when HDMI cable was disconnected)
+    --persistent \ # Suppress repetitive signal source errors (for example when HDMI cable was disconnected)
     --dv-timings \ # Use DV-timings
     --drop-same-frames=30 # Save the traffic
 ```

janus/src/audio.c

@@ -51,6 +51,9 @@ typedef struct {
 } _enc_buffer_s;
 
 
+static _pcm_buffer_s *_pcm_buffer_init(void);
+static _enc_buffer_s *_enc_buffer_init(void);
+
 static void *_pcm_thread(void *v_audio);
 static void *_encoder_thread(void *v_audio);
 
@@ -72,8 +75,8 @@ us_audio_s *us_audio_init(const char *name, unsigned pcm_hz) {
 	us_audio_s *audio;
 	US_CALLOC(audio, 1);
 	audio->pcm_hz = pcm_hz;
-	audio->pcm_queue = us_queue_init(8);
-	audio->enc_queue = us_queue_init(8);
+	US_RING_INIT_WITH_ITEMS(audio->pcm_ring, 8, _pcm_buffer_init);
+	US_RING_INIT_WITH_ITEMS(audio->enc_ring, 8, _enc_buffer_init);
 	atomic_init(&audio->stop, false);
 
 	int err;
@@ -151,8 +154,8 @@ void us_audio_destroy(us_audio_s *audio) {
 	US_DELETE(audio->res, speex_resampler_destroy);
 	US_DELETE(audio->pcm, snd_pcm_close);
 	US_DELETE(audio->pcm_params, snd_pcm_hw_params_free);
-	US_QUEUE_DELETE_WITH_ITEMS(audio->enc_queue, free);
-	US_QUEUE_DELETE_WITH_ITEMS(audio->pcm_queue, free);
+	US_RING_DELETE_WITH_ITEMS(audio->enc_ring, free);
+	US_RING_DELETE_WITH_ITEMS(audio->pcm_ring, free);
 	if (audio->tids_created) {
 		US_JLOG_INFO("audio", "Pipeline closed");
 	}
@@ -163,23 +166,36 @@ int us_audio_get_encoded(us_audio_s *audio, uint8_t *data, size_t *size, uint64_
 	if (atomic_load(&audio->stop)) {
 		return -1;
 	}
-	_enc_buffer_s *buf;
-	if (!us_queue_get(audio->enc_queue, (void **)&buf, 0.1)) {
-		if (*size < buf->used) {
-			free(buf);
-			return -3;
-		}
-		memcpy(data, buf->data, buf->used);
-		*size = buf->used;
-		*pts = buf->pts;
-		free(buf);
-		return 0;
+	const int ri = us_ring_consumer_acquire(audio->enc_ring, 0.1);
+	if (ri < 0) {
+		return -2;
 	}
-	return -2;
+	const _enc_buffer_s *const buf = audio->enc_ring->items[ri];
+	if (*size < buf->used) {
+		us_ring_consumer_release(audio->enc_ring, ri);
+		return -3;
+	}
+	memcpy(data, buf->data, buf->used);
+	*size = buf->used;
+	*pts = buf->pts;
+	us_ring_consumer_release(audio->enc_ring, ri);
+	return 0;
+}
+
+static _pcm_buffer_s *_pcm_buffer_init(void) {
+	_pcm_buffer_s *buf;
+	US_CALLOC(buf, 1);
+	return buf;
+}
+
+static _enc_buffer_s *_enc_buffer_init(void) {
+	_enc_buffer_s *buf;
+	US_CALLOC(buf, 1);
+	return buf;
 }
 
 static void *_pcm_thread(void *v_audio) {
-	US_THREAD_RENAME("us_a_pcm");
+	US_THREAD_SETTLE("us_a_pcm");
 
 	us_audio_s *const audio = (us_audio_s *)v_audio;
 	uint8_t in[_MAX_BUF8];
@@ -194,13 +210,13 @@ static void *_pcm_thread(void *v_audio) {
 			break;
 		}
 
-		if (us_queue_get_free(audio->pcm_queue)) {
-			_pcm_buffer_s *out;
-			US_CALLOC(out, 1);
+		const int ri = us_ring_producer_acquire(audio->pcm_ring, 0);
+		if (ri >= 0) {
+			_pcm_buffer_s *const out = audio->pcm_ring->items[ri];
 			memcpy(out->data, in, audio->pcm_size);
-			assert(!us_queue_put(audio->pcm_queue, out, 0));
+			us_ring_producer_release(audio->pcm_ring, ri);
 		} else {
-			US_JLOG_ERROR("audio", "PCM queue is full");
+			US_JLOG_ERROR("audio", "PCM ring is full");
 		}
 	}
 
@@ -209,45 +225,50 @@ static void *_pcm_thread(void *v_audio) {
 }
 
 static void *_encoder_thread(void *v_audio) {
-	US_THREAD_RENAME("us_a_enc");
+	US_THREAD_SETTLE("us_a_enc");
 
 	us_audio_s *const audio = (us_audio_s *)v_audio;
 	int16_t in_res[_MAX_BUF16];
 
 	while (!atomic_load(&audio->stop)) {
-		_pcm_buffer_s *in;
-		if (!us_queue_get(audio->pcm_queue, (void **)&in, 0.1)) {
-			int16_t *in_ptr;
-			if (audio->res != NULL) {
-				assert(audio->pcm_hz != _ENCODER_INPUT_HZ);
-				uint32_t in_count = audio->pcm_frames;
-				uint32_t out_count = _HZ_TO_FRAMES(_ENCODER_INPUT_HZ);
-				speex_resampler_process_interleaved_int(audio->res, in->data, &in_count, in_res, &out_count);
-				in_ptr = in_res;
-			} else {
-				assert(audio->pcm_hz == _ENCODER_INPUT_HZ);
-				in_ptr = in->data;
-			}
+		const int in_ri = us_ring_consumer_acquire(audio->pcm_ring, 0.1);
+		if (in_ri < 0) {
+			continue;
+		}
+		_pcm_buffer_s *const in = audio->pcm_ring->items[in_ri];
 
-			_enc_buffer_s *out;
-			US_CALLOC(out, 1);
-			const int size = opus_encode(audio->enc, in_ptr, _HZ_TO_FRAMES(_ENCODER_INPUT_HZ), out->data, US_ARRAY_LEN(out->data));
-			free(in);
-			if (size < 0) {
-				_JLOG_PERROR_OPUS(size, "audio", "Fatal: Can't encode PCM frame to OPUS");
-				free(out);
-				break;
-			}
+		int16_t *in_ptr;
+		if (audio->res != NULL) {
+			assert(audio->pcm_hz != _ENCODER_INPUT_HZ);
+			uint32_t in_count = audio->pcm_frames;
+			uint32_t out_count = _HZ_TO_FRAMES(_ENCODER_INPUT_HZ);
+			speex_resampler_process_interleaved_int(audio->res, in->data, &in_count, in_res, &out_count);
+			in_ptr = in_res;
+		} else {
+			assert(audio->pcm_hz == _ENCODER_INPUT_HZ);
+			in_ptr = in->data;
+		}
+
+		const int out_ri = us_ring_producer_acquire(audio->enc_ring, 0);
+		if (out_ri < 0) {
+			US_JLOG_ERROR("audio", "OPUS encoder queue is full");
+			us_ring_consumer_release(audio->pcm_ring, in_ri);
+			continue;
+		}
+		_enc_buffer_s *const out = audio->enc_ring->items[out_ri];
+
+		const int size = opus_encode(audio->enc, in_ptr, _HZ_TO_FRAMES(_ENCODER_INPUT_HZ), out->data, US_ARRAY_LEN(out->data));
+		us_ring_consumer_release(audio->pcm_ring, in_ri);
+
+		if (size >= 0) {
 			out->used = size;
 			out->pts = audio->pts;
 			// https://datatracker.ietf.org/doc/html/rfc7587#section-4.2
 			audio->pts += _HZ_TO_FRAMES(_ENCODER_INPUT_HZ);
-
-			if (us_queue_put(audio->enc_queue, out, 0) != 0) {
-				US_JLOG_ERROR("audio", "OPUS encoder queue is full");
-				free(out);
-			}
+		} else {
+			_JLOG_PERROR_OPUS(size, "audio", "Fatal: Can't encode PCM frame to OPUS");
 		}
+		us_ring_producer_release(audio->enc_ring, out_ri);
 	}
 
 	atomic_store(&audio->stop, true);

janus/src/audio.h

@@ -37,10 +37,10 @@
 
 #include "uslibs/tools.h"
 #include "uslibs/array.h"
+#include "uslibs/ring.h"
 #include "uslibs/threading.h"
 
 #include "logging.h"
-#include "queue.h"
 
 
 typedef struct {
@@ -52,8 +52,8 @@ typedef struct {
 	SpeexResamplerState	*res;
 	OpusEncoder			*enc;
 
-	us_queue_s			*pcm_queue;
-	us_queue_s			*enc_queue;
+	us_ring_s			*pcm_ring;
+	us_ring_s			*enc_ring;
 	uint32_t			pts;
 
 	pthread_t			pcm_tid;

janus/src/client.c

@@ -33,9 +33,9 @@
 #include "uslibs/tools.h"
 #include "uslibs/threading.h"
 #include "uslibs/list.h"
+#include "uslibs/ring.h"
 
 #include "logging.h"
-#include "queue.h"
 #include "rtp.h"
 
 
@@ -54,10 +54,10 @@ us_janus_client_s *us_janus_client_init(janus_callbacks *gw, janus_plugin_sessio
 
 	atomic_init(&client->stop, false);
 
-	client->video_queue = us_queue_init(2048);
+	US_RING_INIT_WITH_ITEMS(client->video_ring, 2048, us_rtp_init);
 	US_THREAD_CREATE(client->video_tid, _video_thread, client);
 
-	client->audio_queue = us_queue_init(64);
+	US_RING_INIT_WITH_ITEMS(client->audio_ring, 64, us_rtp_init);
 	US_THREAD_CREATE(client->audio_tid, _audio_thread, client);
 
 	return client;
@@ -65,14 +65,12 @@ us_janus_client_s *us_janus_client_init(janus_callbacks *gw, janus_plugin_sessio
 
 void us_janus_client_destroy(us_janus_client_s *client) {
 	atomic_store(&client->stop, true);
-	us_queue_put(client->video_queue, NULL, 0);
-	us_queue_put(client->audio_queue, NULL, 0);
 
 	US_THREAD_JOIN(client->video_tid);
-	US_QUEUE_DELETE_WITH_ITEMS(client->video_queue, us_rtp_destroy);
+	US_RING_DELETE_WITH_ITEMS(client->video_ring, us_rtp_destroy);
 
 	US_THREAD_JOIN(client->audio_tid);
-	US_QUEUE_DELETE_WITH_ITEMS(client->audio_queue, us_rtp_destroy);
+	US_RING_DELETE_WITH_ITEMS(client->audio_ring, us_rtp_destroy);
 
 	free(client);
 }
@@ -82,64 +80,69 @@ void us_janus_client_send(us_janus_client_s *client, const us_rtp_s *rtp) {
 		atomic_load(&client->transmit)
 		&& (rtp->video || atomic_load(&client->transmit_audio))
 	) {
-		us_rtp_s *const new = us_rtp_dup(rtp);
-		if (us_queue_put((new->video ? client->video_queue : client->audio_queue), new, 0) != 0) {
-			US_JLOG_ERROR("client", "Session %p %s queue is full",
-				client->session, (new->video ? "video" : "audio"));
-			us_rtp_destroy(new);
+		us_ring_s *const ring = (rtp->video ? client->video_ring : client->audio_ring);
+		const int ri = us_ring_producer_acquire(ring, 0);
+		if (ri < 0) {
+			US_JLOG_ERROR("client", "Session %p %s ring is full",
+				client->session, (rtp->video ? "video" : "audio"));
+			return;
 		}
+		memcpy(ring->items[ri], rtp, sizeof(us_rtp_s));
+		us_ring_producer_release(ring, ri);
 	}
 }
 
 static void *_video_thread(void *v_client) {
+	US_THREAD_SETTLE("us_c_video");
 	return _common_thread(v_client, true);
 }
 
 static void *_audio_thread(void *v_client) {
+	US_THREAD_SETTLE("us_c_audio");
 	return _common_thread(v_client, false);
 }
 
 static void *_common_thread(void *v_client, bool video) {
 	us_janus_client_s *const client = (us_janus_client_s *)v_client;
-	us_queue_s *const queue = (video ? client->video_queue : client->audio_queue);
-	assert(queue != NULL); // Audio may be NULL
+	us_ring_s *const ring = (video ? client->video_ring : client->audio_ring);
+	assert(ring != NULL); // Audio may be NULL
 
 	while (!atomic_load(&client->stop)) {
-		us_rtp_s *rtp;
-		if (!us_queue_get(queue, (void **)&rtp, 0.1)) {
-			if (rtp == NULL) {
-				break;
-			}
+		const int ri = us_ring_consumer_acquire(ring, 0.1);
+		if (ri < 0) {
+			continue;
+		}
+		us_rtp_s rtp;
+		memcpy(&rtp, ring->items[ri], sizeof(us_rtp_s));
+		us_ring_consumer_release(ring, ri);
 
-			if (
-				atomic_load(&client->transmit)
-				&& (video || atomic_load(&client->transmit_audio))
-			) {
-				janus_plugin_rtp packet = {
-					.video = rtp->video,
-					.buffer = (char *)rtp->datagram,
-					.length = rtp->used,
-#					if JANUS_PLUGIN_API_VERSION >= 100
-					// The uStreamer Janus plugin places video in stream index 0 and audio
-					// (if available) in stream index 1.
-					.mindex = (rtp->video ? 0 : 1),
-#					endif
-				};
-				janus_plugin_rtp_extensions_reset(&packet.extensions);
-				/*if (rtp->zero_playout_delay) {
-					// https://github.com/pikvm/pikvm/issues/784
-					packet.extensions.min_delay = 0;
-					packet.extensions.max_delay = 0;
-				} else {
-					packet.extensions.min_delay = 0;
-					// 10s - Chromium/WebRTC default
-					// 3s - Firefox default
-					packet.extensions.max_delay = 300; // == 3s, i.e. 10ms granularity
-				}*/
+		if (
+			atomic_load(&client->transmit)
+			&& (video || atomic_load(&client->transmit_audio))
+		) {
+			janus_plugin_rtp packet = {
+				.video = rtp.video,
+				.buffer = (char*)rtp.datagram,
+				.length = rtp.used,
+#				if JANUS_PLUGIN_API_VERSION >= 100
+				// The uStreamer Janus plugin places video in stream index 0 and audio
+				// (if available) in stream index 1.
+				.mindex = (rtp.video ? 0 : 1),
+#				endif
+			};
+			janus_plugin_rtp_extensions_reset(&packet.extensions);
+			/*if (rtp->zero_playout_delay) {
+				// https://github.com/pikvm/pikvm/issues/784
+				packet.extensions.min_delay = 0;
+				packet.extensions.max_delay = 0;
+			} else {
+				packet.extensions.min_delay = 0;
+				// 10s - Chromium/WebRTC default
+				// 3s - Firefox default
+				packet.extensions.max_delay = 300; // == 3s, i.e. 10ms granularity
+			}*/
 
-				client->gw->relay_rtp(client->session, &packet);
-			}
-			us_rtp_destroy(rtp);
+			client->gw->relay_rtp(client->session, &packet);
 		}
 	}
 	return NULL;

janus/src/client.h

@@ -29,8 +29,8 @@
 
 #include "uslibs/types.h"
 #include "uslibs/list.h"
+#include "uslibs/ring.h"
 
-#include "queue.h"
 #include "rtp.h"
 
 
@@ -44,8 +44,8 @@ typedef struct us_janus_client_sx {
 	pthread_t				audio_tid;
 	atomic_bool				stop;
 
-	us_queue_s				*video_queue;
-	us_queue_s				*audio_queue;
+	us_ring_s				*video_ring;
+	us_ring_s				*audio_ring;
 
     US_LIST_STRUCT(struct us_janus_client_sx);
 } us_janus_client_s;

janus/src/logging.h

@@ -36,11 +36,3 @@
 		JANUS_LOG(LOG_ERR, "[%s/%-9s] " x_msg ": %s\n", US_PLUGIN_NAME, x_prefix, ##__VA_ARGS__, m_perror_str); \
 		free(m_perror_str); \
 	}
-
-#define US_ONCE(...) { \
-		const int m_reported = __LINE__; \
-		if (m_reported != once) { \
-			__VA_ARGS__; \
-			once = m_reported; \
-		} \
-	}

janus/src/memsinkfd.c

@@ -34,7 +34,7 @@
 #include "logging.h"
 
 
-int us_memsink_fd_wait_frame(int fd, us_memsink_shared_s* mem, u64 last_id) {
+int us_memsink_fd_wait_frame(int fd, us_memsink_shared_s *mem, u64 last_id) {
 	const ldf deadline_ts = us_get_now_monotonic() + 1; // wait_timeout
 	ldf now_ts;
 	do {
@@ -57,8 +57,7 @@ int us_memsink_fd_wait_frame(int fd, us_memsink_shared_s* mem, u64 last_id) {
 	return -2;
 }
 
-us_frame_s *us_memsink_fd_get_frame(int fd, us_memsink_shared_s *mem, u64 *frame_id, bool key_required) {
-	us_frame_s *frame = us_frame_init();
+int us_memsink_fd_get_frame(int fd, us_memsink_shared_s *mem, us_frame_s *frame, u64 *frame_id, bool key_required) {
 	us_frame_set_data(frame, mem->data, mem->used);
 	US_FRAME_COPY_META(mem, frame);
 	*frame_id = mem->id;
@@ -67,17 +66,14 @@ us_frame_s *us_memsink_fd_get_frame(int fd, us_memsink_shared_s *mem, u64 *frame
 		mem->key_requested = true;
 	}
 
-	bool ok = true;
+	bool retval = 0;
 	if (frame->format != V4L2_PIX_FMT_H264) {
 		US_JLOG_ERROR("video", "Got non-H264 frame from memsink");
-		ok = false;
+		retval = -1;
 	}
 	if (flock(fd, LOCK_UN) < 0) {
 		US_JLOG_PERROR("video", "Can't unlock memsink");
-		ok = false;
+		retval = -1;
 	}
-	if (!ok) {
-		US_DELETE(frame, us_frame_destroy);
-	}
-	return frame;
+	return retval;
 }

janus/src/memsinkfd.h

@@ -27,5 +27,5 @@
 #include "uslibs/memsinksh.h"
 
 
-int us_memsink_fd_wait_frame(int fd, us_memsink_shared_s* mem, u64 last_id);
-us_frame_s *us_memsink_fd_get_frame(int fd, us_memsink_shared_s *mem, u64 *frame_id, bool key_required);
+int us_memsink_fd_wait_frame(int fd, us_memsink_shared_s *mem, u64 last_id);
+int us_memsink_fd_get_frame(int fd, us_memsink_shared_s *mem, us_frame_s *frame, u64 *frame_id, bool key_required);

janus/src/plugin.c

@@ -40,14 +40,14 @@
 #include "uslibs/tools.h"
 #include "uslibs/threading.h"
 #include "uslibs/list.h"
+#include "uslibs/ring.h"
 #include "uslibs/memsinksh.h"
+#include "uslibs/tc358743.h"
 
 #include "const.h"
 #include "logging.h"
-#include "queue.h"
 #include "client.h"
 #include "audio.h"
-#include "tc358743.h"
 #include "rtp.h"
 #include "rtpv.h"
 #include "rtpa.h"
@@ -60,7 +60,7 @@ static const useconds_t	_g_watchers_polling = 100000;
 
 static us_janus_client_s	*_g_clients = NULL;
 static janus_callbacks		*_g_gw = NULL;
-static us_queue_s			*_g_video_queue = NULL;
+static us_ring_s			*_g_video_ring = NULL;
 static us_rtpv_s			*_g_rtpv = NULL;
 static us_rtpa_s			*_g_rtpa = NULL;
 
@@ -100,18 +100,18 @@ janus_plugin *create(void);
 
 static void *_video_rtp_thread(void *arg) {
 	(void)arg;
-
-	US_THREAD_RENAME("us_video_rtp");
+	US_THREAD_SETTLE("us_video_rtp");
 	atomic_store(&_g_video_rtp_tid_created, true);
 
 	while (!_STOP) {
-		us_frame_s *frame;
-		if (us_queue_get(_g_video_queue, (void **)&frame, 0.1) == 0) {
+		const int ri = us_ring_consumer_acquire(_g_video_ring, 0.1);
+		if (ri >= 0) {
+			const us_frame_s *const frame = _g_video_ring->items[ri];
 			_LOCK_VIDEO;
 			const bool zero_playout_delay = (frame->gop == 0);
 			us_rtpv_wrap(_g_rtpv, frame, zero_playout_delay);
 			_UNLOCK_VIDEO;
-			us_frame_destroy(frame);
+			us_ring_consumer_release(_g_video_ring, ri);
 		}
 	}
 	return NULL;
@@ -119,10 +119,10 @@ static void *_video_rtp_thread(void *arg) {
 
 static void *_video_sink_thread(void *arg) {
 	(void)arg;
-
-	US_THREAD_RENAME("us_video_sink");
+	US_THREAD_SETTLE("us_video_sink");
 	atomic_store(&_g_video_sink_tid_created, true);
 
+	us_frame_s *drop = us_frame_init();
 	u64 frame_id = 0;
 	int once = 0;
 
@@ -150,38 +150,65 @@ static void *_video_sink_thread(void *arg) {
 
 		US_JLOG_INFO("video", "Memsink opened; reading frames ...");
 		while (!_STOP && _HAS_WATCHERS) {
-			const int result = us_memsink_fd_wait_frame(fd, mem, frame_id);
-			if (result == 0) {
-				us_frame_s *const frame = us_memsink_fd_get_frame(fd, mem, &frame_id, atomic_load(&_g_key_required));
-				if (frame == NULL) {
+			const int waited = us_memsink_fd_wait_frame(fd, mem, frame_id);
+			if (waited == 0) {
+				const int ri = us_ring_producer_acquire(_g_video_ring, 0);
+				us_frame_s *frame;
+				if (ri >= 0) {
+					frame = _g_video_ring->items[ri];
+				} else {
+					US_ONCE({ US_JLOG_PERROR("video", "Video ring is full"); });
+					frame = drop;
+				}
+
+				const int got = us_memsink_fd_get_frame(fd, mem, frame, &frame_id, atomic_load(&_g_key_required));
+				if (ri >= 0) {
+					us_ring_producer_release(_g_video_ring, ri);
+				}
+				if (got < 0) {
 					goto close_memsink;
 				}
-				if (frame->key) {
+
+				if (ri >= 0 && frame->key) {
 					atomic_store(&_g_key_required, false);
 				}
-				if (us_queue_put(_g_video_queue, frame, 0) != 0) {
-					US_ONCE({ US_JLOG_PERROR("video", "Video queue is full"); });
-					us_frame_destroy(frame);
-				}
-			} else if (result == -1) {
+			} else if (waited != -2) {
 				goto close_memsink;
 			}
 		}
 
 	close_memsink:
 		US_DELETE(mem, us_memsink_shared_unmap);
-		US_CLOSE_FD(fd, close);
+		US_CLOSE_FD(fd);
 		US_JLOG_INFO("video", "Memsink closed");
 		sleep(1); // error_delay
 	}
+
+	us_frame_destroy(drop);
 	return NULL;
 }
 
+static int _check_tc358743_audio(uint *audio_hz) {
+	int fd;
+	if ((fd = open(_g_config->tc358743_dev_path, O_RDWR)) < 0) {
+		US_JLOG_PERROR("audio", "Can't open TC358743 V4L2 device");
+		return -1;
+	}
+	const int checked = us_tc358743_xioctl_get_audio_hz(fd, audio_hz);
+	if (checked < 0) {
+		US_JLOG_PERROR("audio", "Can't check TC358743 audio state (%d)", checked);
+		close(fd);
+		return -1;
+	}
+	close(fd);
+	return 0;
+}
+
 static void *_audio_thread(void *arg) {
 	(void)arg;
-
-	US_THREAD_RENAME("us_audio");
+	US_THREAD_SETTLE("us_audio");
 	atomic_store(&_g_audio_tid_created, true);
+
 	assert(_g_config->audio_dev_name != NULL);
 	assert(_g_config->tc358743_dev_path != NULL);
 
@@ -193,32 +220,27 @@ static void *_audio_thread(void *arg) {
 			continue;
 		}
 
-		us_tc358743_info_s info = {0};
+		uint audio_hz = 0;
 		us_audio_s *audio = NULL;
 
-		if (us_tc358743_read_info(_g_config->tc358743_dev_path, &info) < 0) {
+		if (_check_tc358743_audio(&audio_hz) < 0) {
 			goto close_audio;
 		}
-		if (!info.has_audio) {
+		if (audio_hz == 0) {
 			US_ONCE({ US_JLOG_INFO("audio", "No audio presented from the host"); });
 			goto close_audio;
 		}
 		US_ONCE({ US_JLOG_INFO("audio", "Detected host audio"); });
-		if ((audio = us_audio_init(_g_config->audio_dev_name, info.audio_hz)) == NULL) {
+		if ((audio = us_audio_init(_g_config->audio_dev_name, audio_hz)) == NULL) {
 			goto close_audio;
 		}
 
 		once = 0;
 
 		while (!_STOP && _HAS_WATCHERS && _HAS_LISTENERS) {
-			if (
-				us_tc358743_read_info(_g_config->tc358743_dev_path, &info) < 0
-				|| !info.has_audio
-				|| audio->pcm_hz != info.audio_hz
-			) {
+			if (_check_tc358743_audio(&audio_hz) < 0 || audio->pcm_hz != audio_hz) {
 				goto close_audio;
 			}
-
 			uz size = US_RTP_DATAGRAM_SIZE - US_RTP_HEADER_SIZE;
 			u8 data[size];
 			u64 pts;
@@ -258,7 +280,7 @@ static int _plugin_init(janus_callbacks *gw, const char *config_dir_path) {
 	}
 	_g_gw = gw;
 
-	_g_video_queue = us_queue_init(1024);
+	US_RING_INIT_WITH_ITEMS(_g_video_ring, 64, us_frame_init);
 	_g_rtpv = us_rtpv_init(_relay_rtp_clients);
 	if (_g_config->audio_dev_name != NULL && us_audio_probe(_g_config->audio_dev_name)) {
 		_g_rtpa = us_rtpa_init(_relay_rtp_clients);
@@ -286,7 +308,7 @@ static void _plugin_destroy(void) {
 		us_janus_client_destroy(client);
 	});
 
-	US_QUEUE_DELETE_WITH_ITEMS(_g_video_queue, us_frame_destroy);
+	US_RING_DELETE_WITH_ITEMS(_g_video_ring, us_frame_destroy);
 
 	US_DELETE(_g_rtpa, us_rtpa_destroy);
 	US_DELETE(_g_rtpv, us_rtpv_destroy);

janus/src/rtp.c

@@ -31,26 +31,22 @@
 #include "uslibs/tools.h"
 
 
-us_rtp_s *us_rtp_init(uint payload, bool video) {
+us_rtp_s *us_rtp_init(void) {
 	us_rtp_s *rtp;
 	US_CALLOC(rtp, 1);
-	rtp->payload = payload;
-	rtp->video = video;
-	rtp->ssrc = us_triple_u32(us_get_now_monotonic_u64());
 	return rtp;
 }
 
-us_rtp_s *us_rtp_dup(const us_rtp_s *rtp) {
-	us_rtp_s *new;
-	US_CALLOC(new, 1);
-	memcpy(new, rtp, sizeof(us_rtp_s));
-	return new;
-}
-
 void us_rtp_destroy(us_rtp_s *rtp) {
 	free(rtp);
 }
 
+void us_rtp_assign(us_rtp_s *rtp, uint payload, bool video) {
+	rtp->payload = payload;
+	rtp->video = video;
+	rtp->ssrc = us_triple_u32(us_get_now_monotonic_u64());
+}
+
 void us_rtp_write_header(us_rtp_s *rtp, u32 pts, bool marked) {
 	u32 word0 = 0x80000000;
 	if (marked) {

janus/src/rtp.h

@@ -44,8 +44,8 @@ typedef struct {
 typedef void (*us_rtp_callback_f)(const us_rtp_s *rtp);
 
 
-us_rtp_s *us_rtp_init(uint payload, bool video);
-us_rtp_s *us_rtp_dup(const us_rtp_s *rtp);
+us_rtp_s *us_rtp_init(void);
 void us_rtp_destroy(us_rtp_s *rtp);
 
+void us_rtp_assign(us_rtp_s *rtp, uint payload, bool video);
 void us_rtp_write_header(us_rtp_s *rtp, u32 pts, bool marked);

janus/src/rtpa.c

@@ -32,7 +32,8 @@
 us_rtpa_s *us_rtpa_init(us_rtp_callback_f callback) {
 	us_rtpa_s *rtpa;
 	US_CALLOC(rtpa, 1);
-	rtpa->rtp = us_rtp_init(111, false);
+	rtpa->rtp = us_rtp_init();
+	us_rtp_assign(rtpa->rtp, 111, false);
 	rtpa->callback = callback;
 	return rtpa;
 }

janus/src/rtpv.c

@@ -44,7 +44,8 @@ static sz _find_annexb(const u8 *data, uz size);
 us_rtpv_s *us_rtpv_init(us_rtp_callback_f callback) {
 	us_rtpv_s *rtpv;
 	US_CALLOC(rtpv, 1);
-	rtpv->rtp = us_rtp_init(96, true);
+	rtpv->rtp = us_rtp_init();
+	us_rtp_assign(rtpv->rtp, 96, true);
 	rtpv->callback = callback;
 	return rtpv;
 }

janus/src/uslibs/queue.c

@@ -0,0 +1 @@
+../../../src/libs/queue.c

janus/src/uslibs/queue.h

@@ -0,0 +1 @@
+../../../src/libs/queue.h

janus/src/uslibs/ring.c

@@ -0,0 +1 @@
+../../../src/libs/ring.c

janus/src/uslibs/ring.h

@@ -0,0 +1 @@
+../../../src/libs/ring.h

janus/src/uslibs/tc358743.c

@@ -0,0 +1 @@
+../../../src/libs/tc358743.c

janus/src/uslibs/tc358743.h

@@ -0,0 +1 @@
+../../../src/libs/tc358743.h

linters/pylint.ini

@@ -33,7 +33,7 @@ max-line-length = 160
 
 [BASIC]
 # Good variable names which should always be accepted, separated by a comma
-good-names = _, __, x, y, ws, make-html-h, make-jpeg-h, make-ico-h
+good-names = _, __, x, y, ws, make-html-h, make-ico-h
 
 # Regular expression matching correct method names
 method-rgx = [a-z_][a-z0-9_]{2,50}$

linters/tox.ini

@@ -13,7 +13,7 @@ commands = cppcheck \
 			--std=c17 \
 			--error-exitcode=1 \
 			--quiet \
-			--enable=warning,unusedFunction,portability,performance,style \
+			--enable=warning,portability,performance,style \
 			--suppress=assignmentInAssert \
 			--suppress=variableScope \
 			--inline-suppr \

man/ustreamer-dump.1

@@ -1,6 +1,6 @@
 .\" Manpage for ustreamer-dump.
 .\" Open an issue or pull request to https://github.com/pikvm/ustreamer to correct errors or typos
-.TH USTREAMER-DUMP 1 "version 5.54" "January 2021"
+.TH USTREAMER-DUMP 1 "version 6.3" "January 2021"
 
 .SH NAME
 ustreamer-dump \- Dump uStreamer's memory sink to file

man/ustreamer.1

@@ -1,6 +1,6 @@
 .\" Manpage for ustreamer.
 .\" Open an issue or pull request to https://github.com/pikvm/ustreamer to correct errors or typos
-.TH USTREAMER 1 "version 5.54" "November 2020"
+.TH USTREAMER 1 "version 6.3" "November 2020"
 
 .SH NAME
 ustreamer \- stream MJPEG video from any V4L2 device to the network
@@ -17,7 +17,7 @@ Without arguments, \fBustreamer\fR will try to open \fB/dev/video0\fR with 640x4
 
 Please note that since µStreamer v2\.0 cross\-domain requests were disabled by default for security reasons\. To enable the old behavior, use the option \fB\-\-allow\-origin=\e*\fR\.
 
-For example, the recommended way of running µStreamer with Auvidea B101 on a Raspberry Pi is:
+For example, the recommended way of running µStreamer with TC358743-based capture device on a Raspberry Pi is:
 
 \fBustreamer \e\fR
 .RS
@@ -27,7 +27,7 @@ For example, the recommended way of running µStreamer with Auvidea B101 on a Ra
 .nf
 \fB\-\-workers=3 \e\fR # Maximum workers for V4L2 encoder
 .nf
-\fB\-\-persistent \e\fR # Don\'t re\-initialize device on timeout (for example when HDMI cable was disconnected)
+\fB\-\-persistent \e\fR # Suppress repetitive signal source errors (for example when HDMI cable was disconnected)
 .nf
 \fB\-\-dv\-timings \e\fR # Use DV\-timings
 .nf
@@ -69,7 +69,7 @@ Desired FPS. Default: maximum possible.
 Drop frames smaller then this limit. Useful if the device produces small\-sized garbage frames. Default: 128 bytes.
 .TP
 .BR \-n ", " \-\-persistent
-Don't re\-initialize device on timeout. Default: disabled.
+Suppress repetitive signal source errors. Default: disabled.
 .TP
 .BR \-t ", " \-\-dv\-timings
 Enable DV-timings querying and events processing to automatic resolution change. Default: disabled.
@@ -103,10 +103,10 @@ NOOP ─ Don't compress MJPEG stream (do nothing).
 It doesn't do anything. Still here for compatibility.
 .TP
 .BR \-k\ \fIpath ", " \-\-blank\ \fIpath
-Path to JPEG file that will be shown when the device is disconnected during the streaming. Default: black screen 640x480 with 'NO SIGNAL'.
+It doesn't do anything. Still here for compatibility.
 .TP
 .BR \-K\ \fIsec ", " \-\-last\-as\-blank\ \fIsec
-Show the last frame received from the camera after it was disconnected, but no more than specified time (or endlessly if 0 is specified). If the device has not yet been online, display 'NO SIGNAL' or the image specified by option \-\-blank. Note: currently this option has no effect on memory sinks. Default: disabled.
+It doesn't do anything. Still here for compatibility.
 .TP
 .BR \-l ", " \-\-slowdown
 Slowdown capturing to 1 FPS or less when no stream or sink clients are connected. Useful to reduce CPU consumption. Default: disabled.

pkg/arch/PKGBUILD

@@ -3,7 +3,7 @@
 
 
 pkgname=ustreamer
-pkgver=5.54
+pkgver=6.3
 pkgrel=1
 pkgdesc="Lightweight and fast MJPEG-HTTP streamer"
 url="https://github.com/pikvm/ustreamer"

pkg/openwrt/Makefile

@@ -6,7 +6,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ustreamer
-PKG_VERSION:=5.54
+PKG_VERSION:=6.3
 PKG_RELEASE:=1
 PKG_MAINTAINER:=Maxim Devaev <mdevaev@gmail.com>
 

python/setup.py

@@ -17,7 +17,7 @@ def _find_sources(suffix: str) -> list[str]:
 if __name__ == "__main__":
     setup(
         name="ustreamer",
-        version="5.54",
+        version="6.3",
         description="uStreamer tools",
         author="Maxim Devaev",
         author_email="mdevaev@gmail.com",

python/src/ustreamer.c

@@ -38,7 +38,7 @@ typedef struct {
 
 static void _MemsinkObject_destroy_internals(_MemsinkObject *self) {
 	US_DELETE(self->mem, us_memsink_shared_unmap);
-	US_CLOSE_FD(self->fd, close);
+	US_CLOSE_FD(self->fd);
 	US_DELETE(self->frame, us_frame_destroy);
 }
 
@@ -109,57 +109,66 @@ static PyObject *_MemsinkObject_exit(_MemsinkObject *self, PyObject *Py_UNUSED(i
 static int _wait_frame(_MemsinkObject *self) {
 	const ldf deadline_ts = us_get_now_monotonic() + self->wait_timeout;
 
-#	define RETURN_OS_ERROR { \
-			Py_BLOCK_THREADS \
-			PyErr_SetFromErrno(PyExc_OSError); \
-			return -1; \
-		}
-
+	int locked = -1;
 	ldf now_ts;
 	do {
 		Py_BEGIN_ALLOW_THREADS
 
-		const int retval = us_flock_timedwait_monotonic(self->fd, self->lock_timeout);
+		locked = us_flock_timedwait_monotonic(self->fd, self->lock_timeout);
 		now_ts = us_get_now_monotonic();
-
-		if (retval < 0 && errno != EWOULDBLOCK) {
-			RETURN_OS_ERROR;
-
-		} else if (retval == 0) {
-			us_memsink_shared_s *mem = self->mem;
-			if (mem->magic == US_MEMSINK_MAGIC && mem->version == US_MEMSINK_VERSION && mem->id != self->frame_id) {
-				if (self->drop_same_frames > 0) {
-					if (
-						US_FRAME_COMPARE_META_USED_NOTS(self->mem, self->frame)
-						&& (self->frame_ts + self->drop_same_frames > now_ts)
-						&& !memcmp(self->frame->data, mem->data, mem->used)
-					) {
-						self->frame_id = mem->id;
-						goto drop;
-					}
-				}
-
-				Py_BLOCK_THREADS
-				return 0;
+		if (locked < 0) {
+			if (errno == EWOULDBLOCK) {
+				goto retry;
 			}
+			goto os_error;
+		}
 
-			if (flock(self->fd, LOCK_UN) < 0) {
-				RETURN_OS_ERROR;
+		us_memsink_shared_s *mem = self->mem;
+		if (mem->magic != US_MEMSINK_MAGIC || mem->version != US_MEMSINK_VERSION) {
+			goto retry;
+		}
+
+		// Let the sink know that the client is alive
+		mem->last_client_ts = now_ts;
+
+		if (mem->id == self->frame_id) {
+			goto retry;
+		}
+
+		if (self->drop_same_frames > 0) {
+			if (
+				US_FRAME_COMPARE_GEOMETRY(self->mem, self->frame)
+				&& (self->frame_ts + self->drop_same_frames > now_ts)
+				&& !memcmp(self->frame->data, mem->data, mem->used)
+			) {
+				self->frame_id = mem->id;
+				goto retry;
 			}
 		}
 
-	drop:
+		// New frame found
+		Py_BLOCK_THREADS
+		return 0;
+
+	os_error:
+		Py_BLOCK_THREADS
+		PyErr_SetFromErrno(PyExc_OSError);
+		return -1;
+
+	retry:
+		if (locked >= 0 && flock(self->fd, LOCK_UN) < 0) {
+			goto os_error;
+		}
 		if (usleep(1000) < 0) {
-			RETURN_OS_ERROR;
+			goto os_error;
 		}
 		Py_END_ALLOW_THREADS
 		if (PyErr_CheckSignals() < 0) {
 			return -1;
 		}
-	} while (now_ts < deadline_ts);
 
+	} while (now_ts < deadline_ts);
 	return -2;
-#	undef RETURN_OS_ERROR
 }
 
 static PyObject *_MemsinkObject_wait_frame(_MemsinkObject *self, PyObject *args, PyObject *kwargs) {
@@ -185,7 +194,6 @@ static PyObject *_MemsinkObject_wait_frame(_MemsinkObject *self, PyObject *args,
 	US_FRAME_COPY_META(self->mem, self->frame);
 	self->frame_id = mem->id;
 	self->frame_ts = us_get_now_monotonic();
-	mem->last_client_ts = self->frame_ts;
 	if (key_required) {
 		mem->key_requested = true;
 	}
@@ -285,7 +293,7 @@ static PyModuleDef _Module = {
 	.m_size = -1,
 };
 
-PyMODINIT_FUNC PyInit_ustreamer(void) { // cppcheck-suppress unusedFunction
+PyMODINIT_FUNC PyInit_ustreamer(void) {
 	PyObject *module = PyModule_Create(&_Module);
 	if (module == NULL) {
 		return NULL;

src/Makefile

@@ -14,7 +14,7 @@ _V4P = ustreamer-v4p.bin
 _CFLAGS = -MD -c -std=c17 -Wall -Wextra -D_GNU_SOURCE $(CFLAGS)
 _LDFLAGS = $(LDFLAGS)
 
-_COMMON_LIBS = -lm -ljpeg -pthread -lrt
+_COMMON_LIBS = -lm -ljpeg -pthread -lrt -latomic
 
 _USTR_LIBS = $(_COMMON_LIBS) -levent -levent_pthreads
 _USTR_SRCS = $(shell ls \
@@ -88,13 +88,16 @@ override _CFLAGS += $(shell pkg-config --cflags libdrm)
 _V4P_LDFLAGS = $(shell pkg-config --libs libdrm)
 endif
 
+
 # =====
 all: $(_TARGETS)
 
 
 install: all
 	mkdir -p $(DESTDIR)$(PREFIX)/bin
-	for i in $(subst .bin,,$(_TARGETS)); do install -m755 $$i.bin $(DESTDIR)$(PREFIX)/bin/$$i; done
+	for i in $(subst .bin,,$(_TARGETS)); do \
+		install -m755 $$i.bin $(DESTDIR)$(PREFIX)/bin/$$i; \
+	done
 
 
 install-strip: install

src/dump/main.c

@@ -24,7 +24,6 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <unistd.h>
-#include <signal.h>
 #include <limits.h>
 #include <float.h>
 #include <getopt.h>
@@ -36,6 +35,7 @@
 #include "../libs/logging.h"
 #include "../libs/frame.h"
 #include "../libs/memsink.h"
+#include "../libs/signal.h"
 #include "../libs/options.h"
 
 #include "file.h"
@@ -95,7 +95,6 @@ typedef struct {
 
 
 static void _signal_handler(int signum);
-static void _install_signal_handlers(void);
 
 static int _dump_sink(
 	const char *sink_name, unsigned sink_timeout,
@@ -190,7 +189,7 @@ int main(int argc, char *argv[]) {
 		ctx.destroy = us_output_file_destroy;
 	}
 
-	_install_signal_handlers();
+	us_install_signals_handler(_signal_handler, false);
 	const int retval = abs(_dump_sink(sink_name, sink_timeout, count, interval, key_required, &ctx));
 	if (ctx.v_output && ctx.destroy) {
 		ctx.destroy(ctx.v_output);
@@ -206,25 +205,6 @@ static void _signal_handler(int signum) {
 	_g_stop = true;
 }
 
-static void _install_signal_handlers(void) {
-	struct sigaction sig_act = {0};
-
-	assert(!sigemptyset(&sig_act.sa_mask));
-	sig_act.sa_handler = _signal_handler;
-	assert(!sigaddset(&sig_act.sa_mask, SIGINT));
-	assert(!sigaddset(&sig_act.sa_mask, SIGTERM));
-	assert(!sigaddset(&sig_act.sa_mask, SIGPIPE));
-
-	US_LOG_DEBUG("Installing SIGINT handler ...");
-	assert(!sigaction(SIGINT, &sig_act, NULL));
-
-	US_LOG_DEBUG("Installing SIGTERM handler ...");
-	assert(!sigaction(SIGTERM, &sig_act, NULL));
-
-	US_LOG_DEBUG("Installing SIGTERM handler ...");
-	assert(!sigaction(SIGPIPE, &sig_act, NULL));
-}
-
 static int _dump_sink(
 	const char *sink_name, unsigned sink_timeout,
 	long long count, long double interval,

src/libs/const.h

@@ -25,8 +25,8 @@
 #include "types.h"
 
 
-#define US_VERSION_MAJOR 5
-#define US_VERSION_MINOR 54
+#define US_VERSION_MAJOR 6
+#define US_VERSION_MINOR 3
 
 #define US_MAKE_VERSION2(_major, _minor) #_major "." #_minor
 #define US_MAKE_VERSION1(_major, _minor) US_MAKE_VERSION2(_major, _minor)

src/libs/device.c

@@ -23,6 +23,7 @@
 #include "device.h"
 
 #include <stdlib.h>
+#include <stdatomic.h>
 #include <stddef.h>
 #include <string.h>
 #include <strings.h>
@@ -80,12 +81,12 @@ static const struct {
 	{"USERPTR",	V4L2_MEMORY_USERPTR},
 };
 
-
+static int _device_wait_buffer(us_device_s *dev);
+static int _device_consume_event(us_device_s *dev);
 static void _v4l2_buffer_copy(const struct v4l2_buffer *src, struct v4l2_buffer *dest);
 static bool _device_is_buffer_valid(us_device_s *dev, const struct v4l2_buffer *buf, const u8 *data);
 static int _device_open_check_cap(us_device_s *dev);
-static int _device_open_dv_timings(us_device_s *dev);
-static int _device_apply_dv_timings(us_device_s *dev);
+static int _device_open_dv_timings(us_device_s *dev, bool apply);
 static int _device_open_format(us_device_s *dev, bool first);
 static void _device_open_hw_fps(us_device_s *dev);
 static void _device_open_jpeg_quality(us_device_s *dev);
@@ -93,6 +94,7 @@ static int _device_open_io_method(us_device_s *dev);
 static int _device_open_io_method_mmap(us_device_s *dev);
 static int _device_open_io_method_userptr(us_device_s *dev);
 static int _device_open_queue_buffers(us_device_s *dev);
+static int _device_open_export_to_dma(us_device_s *dev);
 static int _device_apply_resolution(us_device_s *dev, uint width, uint height, float hz);
 
 static void _device_apply_controls(us_device_s *dev);
@@ -148,16 +150,16 @@ int us_device_parse_format(const char *str) {
 			return item->format;
 		}
 	});
-	return US_FORMAT_UNKNOWN;
+	return -1;
 }
 
-v4l2_std_id us_device_parse_standard(const char *str) {
-	US_ARRAY_ITERATE(_STANDARDS, 1, item, {
+int us_device_parse_standard(const char *str) {
+	US_ARRAY_ITERATE(_STANDARDS, 0, item, {
 		if (!strcasecmp(item->name, str)) {
 			return item->standard;
 		}
 	});
-	return US_STANDARD_UNKNOWN;
+	return -1;
 }
 
 int us_device_parse_io_method(const char *str) {
@@ -166,22 +168,46 @@ int us_device_parse_io_method(const char *str) {
 			return item->io_method;
 		}
 	});
-	return US_IO_METHOD_UNKNOWN;
+	return -1;
 }
 
 int us_device_open(us_device_s *dev) {
 	us_device_runtime_s *const run = dev->run;
 
-	if ((run->fd = open(dev->path, O_RDWR|O_NONBLOCK)) < 0) {
-		_D_LOG_PERROR("Can't open device");
+	if (access(dev->path, R_OK | W_OK) < 0) {
+		if (run->open_error_reported != -errno) {
+			run->open_error_reported = -errno; // Don't confuse it with __LINE__
+			US_LOG_PERROR("No access to capture device");
+		}
+		goto tmp_error;
+	}
+
+	_D_LOG_DEBUG("Opening capture device ...");
+	if ((run->fd = open(dev->path, O_RDWR | O_NONBLOCK)) < 0) {
+		_D_LOG_PERROR("Can't capture open device");
 		goto error;
 	}
-	_D_LOG_INFO("Device fd=%d opened", run->fd);
+	_D_LOG_DEBUG("Capture device fd=%d opened", run->fd);
+
+	if (dev->dv_timings && dev->persistent) {
+		_D_LOG_DEBUG("Probing DV-timings or QuerySTD ...");
+		if (_device_open_dv_timings(dev, false) < 0) {
+			const int line = __LINE__;
+			if (run->open_error_reported != line) {
+				run->open_error_reported = line;
+				_D_LOG_ERROR("No signal from source");
+			}
+			goto tmp_error;
+		}
+	}
 
 	if (_device_open_check_cap(dev) < 0) {
 		goto error;
 	}
-	if (_device_open_dv_timings(dev) < 0) {
+	if (_device_apply_resolution(dev, dev->width, dev->height, dev->run->hz)) {
+		goto error;
+	}
+	if (dev->dv_timings && _device_open_dv_timings(dev, true) < 0) {
 		goto error;
 	}
 	if (_device_open_format(dev, true) < 0) {
@@ -195,12 +221,32 @@ int us_device_open(us_device_s *dev) {
 	if (_device_open_queue_buffers(dev) < 0) {
 		goto error;
 	}
+	if (dev->dma_export && !us_is_jpeg(run->format)) {
+		// uStreamer doesn't have any component that could handle JPEG capture via DMA
+		run->dma = !_device_open_export_to_dma(dev);
+		if (!run->dma && dev->dma_required) {
+			goto error;
+		}
+	}
 	_device_apply_controls(dev);
 
-	_D_LOG_DEBUG("Device fd=%d initialized", run->fd);
+	enum v4l2_buf_type type = run->capture_type;
+	if (us_xioctl(run->fd, VIDIOC_STREAMON, &type) < 0) {
+		_D_LOG_PERROR("Can't start capturing");
+		goto error;
+	}
+	run->streamon = true;
+
+	run->open_error_reported = 0;
+	_D_LOG_INFO("Capturing started");
 	return 0;
 
+tmp_error:
+	us_device_close(dev);
+	return -2;
+
 error:
+	run->open_error_reported = 0;
 	us_device_close(dev);
 	return -1;
 }
@@ -208,19 +254,30 @@ error:
 void us_device_close(us_device_s *dev) {
 	us_device_runtime_s *const run = dev->run;
 
-	run->persistent_timeout_reported = false;
+	bool say = false;
+
+	if (run->streamon) {
+		say = true;
+		_D_LOG_DEBUG("Calling VIDIOC_STREAMOFF ...");
+		enum v4l2_buf_type type = run->capture_type;
+		if (us_xioctl(run->fd, VIDIOC_STREAMOFF, &type) < 0) {
+			_D_LOG_PERROR("Can't stop capturing");
+		}
+		run->streamon = false;
+	}
 
 	if (run->hw_bufs != NULL) {
-		_D_LOG_DEBUG("Releasing device buffers ...");
+		say = true;
+		_D_LOG_DEBUG("Releasing HW buffers ...");
 		for (uint index = 0; index < run->n_bufs; ++index) {
 			us_hw_buffer_s *hw = &run->hw_bufs[index];
 
-			US_CLOSE_FD(hw->dma_fd, close);
+			US_CLOSE_FD(hw->dma_fd);
 
 			if (dev->io_method == V4L2_MEMORY_MMAP) {
 				if (hw->raw.allocated > 0 && hw->raw.data != NULL) {
 					if (munmap(hw->raw.data, hw->raw.allocated) < 0) {
-						_D_LOG_PERROR("Can't unmap device buffer=%u", index);
+						_D_LOG_PERROR("Can't unmap HW buffer=%u", index);
 					}
 				}
 			} else { // V4L2_MEMORY_USERPTR
@@ -235,105 +292,26 @@ void us_device_close(us_device_s *dev) {
 		run->n_bufs = 0;
 	}
 
-	if (run->fd >= 0) {
-		_D_LOG_DEBUG("Closing device ...");
-		if (close(run->fd) < 0) {
-			_D_LOG_PERROR("Can't close device fd=%d", run->fd);
-		} else {
-			_D_LOG_INFO("Device fd=%d closed", run->fd);
-		}
-		run->fd = -1;
+	US_CLOSE_FD(run->fd);
+
+	if (say) {
+		_D_LOG_INFO("Capturing stopped");
 	}
 }
 
-int us_device_export_to_dma(us_device_s *dev) {
-	us_device_runtime_s *const run = dev->run;
-
-	for (uint index = 0; index < run->n_bufs; ++index) {
-		struct v4l2_exportbuffer exp = {
-			.type = run->capture_type,
-			.index = index,
-		};
-		_D_LOG_DEBUG("Exporting device buffer=%u to DMA ...", index);
-		if (us_xioctl(run->fd, VIDIOC_EXPBUF, &exp) < 0) {
-			_D_LOG_PERROR("Can't export device buffer=%u to DMA", index);
-			goto error;
-		}
-		run->hw_bufs[index].dma_fd = exp.fd;
-	}
-	return 0;
-
-error:
-	for (uint index = 0; index < run->n_bufs; ++index) {
-		US_CLOSE_FD(run->hw_bufs[index].dma_fd, close);
-	}
-	return -1;
-}
-
-int us_device_switch_capturing(us_device_s *dev, bool enable) {
-	us_device_runtime_s *const run = dev->run;
-
-	if (enable != run->capturing) {
-		enum v4l2_buf_type type = run->capture_type;
-
-		_D_LOG_DEBUG("%s device capturing ...", (enable ? "Starting" : "Stopping"));
-		if (us_xioctl(run->fd, (enable ? VIDIOC_STREAMON : VIDIOC_STREAMOFF), &type) < 0) {
-			_D_LOG_PERROR("Can't %s capturing", (enable ? "start" : "stop"));
-			if (enable) {
-				return -1;
-			}
-		}
-		run->capturing = enable;
-		_D_LOG_INFO("Capturing %s", (enable ? "started" : "stopped"));
-	}
-	return 0;
-}
-
-int us_device_select(us_device_s *dev, bool *has_read, bool *has_write, bool *has_error) {
-	us_device_runtime_s *const run = dev->run;
-
-#	define INIT_FD_SET(x_set) \
-		fd_set x_set; FD_ZERO(&x_set); FD_SET(run->fd, &x_set);
-	INIT_FD_SET(read_fds);
-	INIT_FD_SET(write_fds);
-	INIT_FD_SET(error_fds);
-#	undef INIT_FD_SET
-
-	struct timeval timeout;
-	timeout.tv_sec = dev->timeout;
-	timeout.tv_usec = 0;
-
-	_D_LOG_DEBUG("Calling select() on video device ...");
-
-	int retval = select(run->fd + 1, &read_fds, &write_fds, &error_fds, &timeout);
-	if (retval > 0) {
-		*has_read = FD_ISSET(run->fd, &read_fds);
-		*has_write = FD_ISSET(run->fd, &write_fds);
-		*has_error = FD_ISSET(run->fd, &error_fds);
-	} else {
-		*has_read = false;
-		*has_write = false;
-		*has_error = false;
-	}
-	_D_LOG_DEBUG("Device select() --> %d", retval);
-
-	if (retval > 0) {
-		run->persistent_timeout_reported = false;
-	} else if (retval == 0) {
-		if (dev->persistent) {
-			if (!run->persistent_timeout_reported) {
-				_D_LOG_ERROR("Persistent device timeout (unplugged)");
-				run->persistent_timeout_reported = true;
-			}
-		} else {
-			// Если устройство не персистентное, то таймаут является ошибкой
-			retval = -1;
-		}
-	}
-	return retval;
-}
-
 int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
+	// Это сложная функция, которая делает сразу много всего, чтобы получить новый фрейм.
+	//   - Вызывается _device_wait_buffer() с select() внутри, чтобы подождать новый фрейм
+	//     или эвент V4L2. Обработка эвентов более приоритетна, чем кадров.
+	//   - Если есть новые фреймы, то пропустить их все, пока не закончатся и вернуть
+	//     самый-самый свежий, содержащий при этом валидные данные.
+	//   - Если таковых не нашлось, вернуть -2.
+	//   - Ошибка -1 возвращается при любых сбоях.
+
+	if (_device_wait_buffer(dev) < 0) {
+		return -1;
+	}
+
 	us_device_runtime_s *const run = dev->run;
 
 	*hw = NULL;
@@ -349,7 +327,7 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 	uint skipped = 0;
 	bool broken = false;
 
-	_D_LOG_DEBUG("Grabbing device buffer ...");
+	_D_LOG_DEBUG("Grabbing hw buffer ...");
 
 	do {
 		struct v4l2_buffer new = {0};
@@ -365,7 +343,7 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 
 		if (new_got) {
 			if (new.index >= run->n_bufs) {
-				_D_LOG_ERROR("V4L2 error: grabbed invalid device buffer=%u, n_bufs=%u", new.index, run->n_bufs);
+				_D_LOG_ERROR("V4L2 error: grabbed invalid HW buffer=%u, n_bufs=%u", new.index, run->n_bufs);
 				return -1;
 			}
 
@@ -373,7 +351,7 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 #			define FRAME_DATA(x_buf) run->hw_bufs[x_buf.index].raw.data
 
 			if (GRABBED(new)) {
-				_D_LOG_ERROR("V4L2 error: grabbed device buffer=%u is already used", new.index);
+				_D_LOG_ERROR("V4L2 error: grabbed HW buffer=%u is already used", new.index);
 				return -1;
 			}
 			GRABBED(new) = true;
@@ -384,9 +362,9 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 
 			broken = !_device_is_buffer_valid(dev, &new, FRAME_DATA(new));
 			if (broken) {
-				_D_LOG_DEBUG("Releasing device buffer=%u (broken frame) ...", new.index);
+				_D_LOG_DEBUG("Releasing HW buffer=%u (broken frame) ...", new.index);
 				if (us_xioctl(run->fd, VIDIOC_QBUF, &new) < 0) {
-					_D_LOG_PERROR("Can't release device buffer=%u (broken frame)", new.index);
+					_D_LOG_PERROR("Can't release HW buffer=%u (broken frame)", new.index);
 					return -1;
 				}
 				GRABBED(new) = false;
@@ -395,7 +373,7 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 
 			if (buf_got) {
 				if (us_xioctl(run->fd, VIDIOC_QBUF, &buf) < 0) {
-					_D_LOG_PERROR("Can't release device buffer=%u (skipped frame)", buf.index);
+					_D_LOG_PERROR("Can't release HW buffer=%u (skipped frame)", buf.index);
 					return -1;
 				}
 				GRABBED(buf) = false;
@@ -417,12 +395,13 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 					return -2; // If we have only broken frames on this capture session
 				}
 			}
-			_D_LOG_PERROR("Can't grab device buffer");
+			_D_LOG_PERROR("Can't grab HW buffer");
 			return -1;
 		}
 	} while (true);
 
 	*hw = &run->hw_bufs[buf.index];
+	atomic_store(&(*hw)->refs, 0);
 	(*hw)->raw.dma_fd = (*hw)->dma_fd;
 	(*hw)->raw.used = buf.bytesused;
 	(*hw)->raw.width = run->width;
@@ -433,36 +412,89 @@ int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw) {
 	_v4l2_buffer_copy(&buf, &(*hw)->buf);
 	(*hw)->raw.grab_ts = (ldf)((buf.timestamp.tv_sec * (u64)1000) + (buf.timestamp.tv_usec / 1000)) / 1000;
 
-	_D_LOG_DEBUG("Grabbed new frame: buffer=%u, bytesused=%u, grab_ts=%.3Lf, latency=%.3Lf, skipped=%u",
+	_D_LOG_DEBUG("Grabbed HW buffer=%u: bytesused=%u, grab_ts=%.3Lf, latency=%.3Lf, skipped=%u",
 		buf.index, buf.bytesused, (*hw)->raw.grab_ts, us_get_now_monotonic() - (*hw)->raw.grab_ts, skipped);
 	return buf.index;
 }
 
 int us_device_release_buffer(us_device_s *dev, us_hw_buffer_s *hw) {
+	assert(atomic_load(&hw->refs) == 0);
 	const uint index = hw->buf.index;
-	_D_LOG_DEBUG("Releasing device buffer=%u ...", index);
+	_D_LOG_DEBUG("Releasing HW buffer=%u ...", index);
 	if (us_xioctl(dev->run->fd, VIDIOC_QBUF, &hw->buf) < 0) {
-		_D_LOG_PERROR("Can't release device buffer=%u", index);
+		_D_LOG_PERROR("Can't release HW buffer=%u", index);
 		return -1;
 	}
 	hw->grabbed = false;
+	_D_LOG_DEBUG("HW buffer=%u released", index);
 	return 0;
 }
 
-int us_device_consume_event(us_device_s *dev) {
-	struct v4l2_event event;
-	_D_LOG_DEBUG("Consuming V4L2 event ...");
-	if (us_xioctl(dev->run->fd, VIDIOC_DQEVENT, &event) == 0) {
-		switch (event.type) {
-			case V4L2_EVENT_SOURCE_CHANGE:
-				_D_LOG_INFO("Got V4L2_EVENT_SOURCE_CHANGE: source changed");
-				return -1;
-			case V4L2_EVENT_EOS:
-				_D_LOG_INFO("Got V4L2_EVENT_EOS: end of stream (ignored)");
-				return 0;
+void us_device_buffer_incref(us_hw_buffer_s *hw) {
+	atomic_fetch_add(&hw->refs, 1);
+}
+
+void us_device_buffer_decref(us_hw_buffer_s *hw) {
+	atomic_fetch_sub(&hw->refs, 1);
+}
+
+int _device_wait_buffer(us_device_s *dev) {
+	us_device_runtime_s *const run = dev->run;
+
+#	define INIT_FD_SET(x_set) \
+		fd_set x_set; FD_ZERO(&x_set); FD_SET(run->fd, &x_set);
+	INIT_FD_SET(read_fds);
+	INIT_FD_SET(error_fds);
+#	undef INIT_FD_SET
+
+	// Раньше мы проверяли и has_write, но потом выяснилось, что libcamerify зачем-то
+	// генерирует эвенты на запись, вероятно ошибочно. Судя по всему, игнорирование
+	// has_write не делает никому плохо.
+
+	struct timeval timeout;
+	timeout.tv_sec = dev->timeout;
+	timeout.tv_usec = 0;
+
+	_D_LOG_DEBUG("Calling select() on video device ...");
+
+	bool has_read = false;
+	bool has_error = false;
+	const int selected = select(run->fd + 1, &read_fds, NULL, &error_fds, &timeout);
+	if (selected > 0) {
+		has_read = FD_ISSET(run->fd, &read_fds);
+		has_error = FD_ISSET(run->fd, &error_fds);
+	}
+	_D_LOG_DEBUG("Device select() --> %d; has_read=%d, has_error=%d", selected, has_read, has_error);
+
+	if (selected < 0) {
+		if (errno != EINTR) {
+			_D_LOG_PERROR("Device select() error");
 		}
+		return -1;
+	} else if (selected == 0) {
+		_D_LOG_ERROR("Device select() timeout");
+		return -1;
 	} else {
-		_D_LOG_PERROR("Got some V4L2 device event, but where is it? ");
+		if (has_error && _device_consume_event(dev) < 0) {
+			return -1; // Restart required
+		}
+	}
+	return 0;
+}
+
+static int _device_consume_event(us_device_s *dev) {
+	struct v4l2_event event;
+	if (us_xioctl(dev->run->fd, VIDIOC_DQEVENT, &event) < 0) {
+		_D_LOG_PERROR("Can't consume V4L2 event");
+		return -1;
+	}
+	switch (event.type) {
+		case V4L2_EVENT_SOURCE_CHANGE:
+			_D_LOG_INFO("Got V4L2_EVENT_SOURCE_CHANGE: Source changed");
+			return -1;
+		case V4L2_EVENT_EOS:
+			_D_LOG_INFO("Got V4L2_EVENT_EOS: End of stream");
+			return -1;
 	}
 	return 0;
 }
@@ -565,68 +597,81 @@ static int _device_open_check_cap(us_device_s *dev) {
 	return 0;
 }
 
-static int _device_open_dv_timings(us_device_s *dev) {
-	_device_apply_resolution(dev, dev->width, dev->height, dev->run->hz);
-	if (dev->dv_timings) {
-		_D_LOG_DEBUG("Using DV-timings");
+static int _device_open_dv_timings(us_device_s *dev, bool apply) {
+	// Just probe only if @apply is false
 
-		if (_device_apply_dv_timings(dev) < 0) {
-			return -1;
-		}
+	const us_device_runtime_s *const run = dev->run;
 
-		struct v4l2_event_subscription sub = {.type = V4L2_EVENT_SOURCE_CHANGE};
-		_D_LOG_DEBUG("Subscribing to DV-timings events ...")
-		if (us_xioctl(dev->run->fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
-			_D_LOG_PERROR("Can't subscribe to DV-timings events");
-			return -1;
-		}
-	}
-	return 0;
-}
-
-static int _device_apply_dv_timings(us_device_s *dev) {
-	us_device_runtime_s *const run = dev->run; // cppcheck-suppress constVariablePointer
+	int dv_errno = 0;
 
 	struct v4l2_dv_timings dv = {0};
-
-	_D_LOG_DEBUG("Calling us_xioctl(VIDIOC_QUERY_DV_TIMINGS) ...");
-	if (us_xioctl(run->fd, VIDIOC_QUERY_DV_TIMINGS, &dv) == 0) {
-		float hz = 0;
-		if (dv.type == V4L2_DV_BT_656_1120) {
-			// See v4l2_print_dv_timings() in the kernel
-			const uint htot = V4L2_DV_BT_FRAME_WIDTH(&dv.bt);
-			const uint vtot = V4L2_DV_BT_FRAME_HEIGHT(&dv.bt) / (dv.bt.interlaced ? 2 : 1);
-			const uint fps = ((htot * vtot) > 0 ? ((100 * (u64)dv.bt.pixelclock)) / (htot * vtot) : 0);
-			hz = (fps / 100) + (fps % 100) / 100.0;
-			_D_LOG_INFO("Got new DV-timings: %ux%u%s%.02f, pixclk=%llu, vsync=%u, hsync=%u",
-				dv.bt.width, dv.bt.height, (dv.bt.interlaced ? "i" : "p"), hz,
-				(ull)dv.bt.pixelclock, dv.bt.vsync, dv.bt.hsync); // See #11 about %llu
-		} else {
-			_D_LOG_INFO("Got new DV-timings: %ux%u, pixclk=%llu, vsync=%u, hsync=%u",
-				dv.bt.width, dv.bt.height,
-				(ull)dv.bt.pixelclock, dv.bt.vsync, dv.bt.hsync);
-		}
-
-		_D_LOG_DEBUG("Calling us_xioctl(VIDIOC_S_DV_TIMINGS) ...");
-		if (us_xioctl(run->fd, VIDIOC_S_DV_TIMINGS, &dv) < 0) {
-			_D_LOG_PERROR("Failed to set DV-timings");
-			return -1;
-		}
-
-		if (_device_apply_resolution(dev, dv.bt.width, dv.bt.height, hz) < 0) {
-			return -1;
-		}
-
-	} else {
-		_D_LOG_DEBUG("Calling us_xioctl(VIDIOC_QUERYSTD) ...");
-		if (us_xioctl(run->fd, VIDIOC_QUERYSTD, &dev->standard) == 0) {
-			_D_LOG_INFO("Applying the new VIDIOC_S_STD: %s ...", _standard_to_string(dev->standard));
-			if (us_xioctl(run->fd, VIDIOC_S_STD, &dev->standard) < 0) {
-				_D_LOG_PERROR("Can't set video standard");
-				return -1;
-			}
-		}
+	_D_LOG_DEBUG("Querying DV-timings (apply=%u) ...", apply);
+	if (us_xioctl(run->fd, VIDIOC_QUERY_DV_TIMINGS, &dv) < 0) {
+		// TC358743 errors here (see in the kernel: drivers/media/i2c/tc358743.c):
+		//   - ENOLINK: No valid signal (SYS_STATUS & MASK_S_TMDS)
+		//   - ENOLCK:  No sync on signal (SYS_STATUS & MASK_S_SYNC)
+		dv_errno = errno;
+		goto querystd;
+	} else if (!apply) {
+		goto probe_only;
 	}
+
+	float hz = 0;
+	if (dv.type == V4L2_DV_BT_656_1120) {
+		// See v4l2_print_dv_timings() in the kernel
+		const uint htot = V4L2_DV_BT_FRAME_WIDTH(&dv.bt);
+		const uint vtot = V4L2_DV_BT_FRAME_HEIGHT(&dv.bt) / (dv.bt.interlaced ? 2 : 1);
+		const uint fps = ((htot * vtot) > 0 ? ((100 * (u64)dv.bt.pixelclock)) / (htot * vtot) : 0);
+		hz = (fps / 100) + (fps % 100) / 100.0;
+		_D_LOG_INFO("Detected DV-timings: %ux%u%s%.02f, pixclk=%llu, vsync=%u, hsync=%u",
+			dv.bt.width, dv.bt.height, (dv.bt.interlaced ? "i" : "p"), hz,
+			(ull)dv.bt.pixelclock, dv.bt.vsync, dv.bt.hsync); // See #11 about %llu
+	} else {
+		_D_LOG_INFO("Detected DV-timings: %ux%u, pixclk=%llu, vsync=%u, hsync=%u",
+			dv.bt.width, dv.bt.height,
+			(ull)dv.bt.pixelclock, dv.bt.vsync, dv.bt.hsync);
+	}
+
+	_D_LOG_DEBUG("Applying DV-timings ...");
+	if (us_xioctl(run->fd, VIDIOC_S_DV_TIMINGS, &dv) < 0) {
+		_D_LOG_PERROR("Failed to apply DV-timings");
+		return -1;
+	}
+	if (_device_apply_resolution(dev, dv.bt.width, dv.bt.height, hz) < 0) {
+		return -1;
+	}
+	goto subscribe;
+
+querystd:
+	_D_LOG_DEBUG("Failed to query DV-timings, trying QuerySTD ...");
+	if (us_xioctl(run->fd, VIDIOC_QUERYSTD, &dev->standard) < 0) {
+		if (apply) {
+			char *std_error = us_errno_to_string(errno); // Read the errno first
+			char *dv_error = us_errno_to_string(dv_errno);
+			_D_LOG_ERROR("Failed to query DV-timings (%s) and QuerySTD (%s)", dv_error, std_error);
+			free(dv_error);
+			free(std_error);
+		}
+		return -1;
+	} else if (!apply) {
+		goto probe_only;
+	}
+	if (us_xioctl(run->fd, VIDIOC_S_STD, &dev->standard) < 0) {
+		_D_LOG_PERROR("Can't set apply standard: %s", _standard_to_string(dev->standard));
+		return -1;
+	}
+	_D_LOG_DEBUG("Applied new video standard: %s", _standard_to_string(dev->standard));
+
+subscribe:
+	; // Empty statement for the goto label above
+	struct v4l2_event_subscription sub = {.type = V4L2_EVENT_SOURCE_CHANGE};
+	_D_LOG_DEBUG("Subscribing to V4L2_EVENT_SOURCE_CHANGE ...")
+	if (us_xioctl(dev->run->fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
+		_D_LOG_PERROR("Can't subscribe to V4L2_EVENT_SOURCE_CHANGE");
+		return -1;
+	}
+
+probe_only:
 	return 0;
 }
 
@@ -689,7 +734,7 @@ static int _device_open_format(us_device_s *dev, bool first) {
 			_format_to_string_supported(FMT(pixelformat)));
 
 		char *format_str;
-		if ((format_str = (char *)_format_to_string_nullable(FMT(pixelformat))) != NULL) {
+		if ((format_str = (char*)_format_to_string_nullable(FMT(pixelformat))) != NULL) {
 			_D_LOG_INFO("Falling back to format=%s", format_str);
 		} else {
 			char fourcc_str[8];
@@ -837,6 +882,7 @@ static int _device_open_io_method_mmap(us_device_s *dev) {
 		}
 
 		us_hw_buffer_s *hw = &run->hw_bufs[run->n_bufs];
+		atomic_init(&hw->refs, 0);
 		const uz buf_size = (run->capture_mplane ? buf.m.planes[0].length : buf.length);
 		const off_t buf_offset = (run->capture_mplane ? buf.m.planes[0].m.mem_offset : buf.m.offset);
 
@@ -931,6 +977,30 @@ static int _device_open_queue_buffers(us_device_s *dev) {
 	return 0;
 }
 
+static int _device_open_export_to_dma(us_device_s *dev) {
+	us_device_runtime_s *const run = dev->run;
+
+	for (uint index = 0; index < run->n_bufs; ++index) {
+		struct v4l2_exportbuffer exp = {
+			.type = run->capture_type,
+			.index = index,
+		};
+		_D_LOG_DEBUG("Exporting device buffer=%u to DMA ...", index);
+		if (us_xioctl(run->fd, VIDIOC_EXPBUF, &exp) < 0) {
+			_D_LOG_PERROR("Can't export device buffer=%u to DMA", index);
+			goto error;
+		}
+		run->hw_bufs[index].dma_fd = exp.fd;
+	}
+	return 0;
+
+error:
+	for (uint index = 0; index < run->n_bufs; ++index) {
+		US_CLOSE_FD(run->hw_bufs[index].dma_fd);
+	}
+	return -1;
+}
+
 static int _device_apply_resolution(us_device_s *dev, uint width, uint height, float hz) {
 	// Тут VIDEO_MIN_* не используются из-за странностей минимального разрешения при отсутствии сигнала
 	// у некоторых устройств, например TC358743
@@ -1066,7 +1136,7 @@ static const char *_standard_to_string(v4l2_std_id standard) {
 			return item->name;
 		}
 	});
-	return _STANDARDS[0].name;
+	return "???";
 }
 
 static const char *_io_method_to_string_supported(enum v4l2_memory io_method) {

src/libs/device.h

@@ -22,6 +22,8 @@
 
 #pragma once
 
+#include <stdatomic.h>
+
 #include <linux/videodev2.h>
 
 #include "types.h"
@@ -29,20 +31,15 @@
 
 
 #define US_VIDEO_MIN_WIDTH		((uint)160)
-#define US_VIDEO_MAX_WIDTH		((uint)15360)
+#define US_VIDEO_MAX_WIDTH		((uint)15360) // Remember about stream->run->http_capture_state;
 
 #define US_VIDEO_MIN_HEIGHT		((uint)120)
 #define US_VIDEO_MAX_HEIGHT		((uint)8640)
 
 #define US_VIDEO_MAX_FPS		((uint)120)
 
-#define US_STANDARD_UNKNOWN		V4L2_STD_UNKNOWN
 #define US_STANDARDS_STR		"PAL, NTSC, SECAM"
-
-#define US_FORMAT_UNKNOWN		-1
 #define US_FORMATS_STR			"YUYV, YVYU, UYVY, RGB565, RGB24, BGR24, MJPEG, JPEG"
-
-#define US_IO_METHOD_UNKNOWN	-1
 #define US_IO_METHODS_STR		"MMAP, USERPTR"
 
 
@@ -51,6 +48,7 @@ typedef struct {
 	struct v4l2_buffer	buf;
 	int					dma_fd;
 	bool				grabbed;
+	atomic_int			refs;
 } us_hw_buffer_s;
 
 typedef struct {
@@ -65,10 +63,11 @@ typedef struct {
 	uz					raw_size;
 	uint				n_bufs;
 	us_hw_buffer_s		*hw_bufs;
+	bool				dma;
 	enum v4l2_buf_type	capture_type;
 	bool				capture_mplane;
-	bool				capturing;
-	bool				persistent_timeout_reported;
+	bool				streamon;
+	int					open_error_reported;
 } us_device_runtime_s;
 
 typedef enum {
@@ -110,6 +109,8 @@ typedef struct {
 	enum v4l2_memory	io_method;
 	bool				dv_timings;
 	uint				n_bufs;
+	bool				dma_export;
+	bool				dma_required;
 	uint				desired_fps;
 	uz					min_frame_size;
 	bool				persistent;
@@ -123,15 +124,14 @@ us_device_s *us_device_init(void);
 void us_device_destroy(us_device_s *dev);
 
 int us_device_parse_format(const char *str);
-v4l2_std_id us_device_parse_standard(const char *str);
+int us_device_parse_standard(const char *str);
 int us_device_parse_io_method(const char *str);
 
 int us_device_open(us_device_s *dev);
 void us_device_close(us_device_s *dev);
 
-int us_device_export_to_dma(us_device_s *dev);
-int us_device_switch_capturing(us_device_s *dev, bool enable);
-int us_device_select(us_device_s *dev, bool *has_read, bool *has_write, bool *has_error);
 int us_device_grab_buffer(us_device_s *dev, us_hw_buffer_s **hw);
 int us_device_release_buffer(us_device_s *dev, us_hw_buffer_s *hw);
-int us_device_consume_event(us_device_s *dev);
+
+void us_device_buffer_incref(us_hw_buffer_s *hw);
+void us_device_buffer_decref(us_hw_buffer_s *hw);

src/libs/frame.c

@@ -74,7 +74,7 @@ void us_frame_copy(const us_frame_s *src, us_frame_s *dest) {
 bool us_frame_compare(const us_frame_s *a, const us_frame_s *b) {
 	return (
 		a->allocated && b->allocated
-		&& US_FRAME_COMPARE_META_USED_NOTS(a, b)
+		&& US_FRAME_COMPARE_GEOMETRY(a, b)
 		&& !memcmp(a->data, b->data, b->used)
 	);
 }
@@ -99,6 +99,10 @@ uint us_frame_get_padding(const us_frame_s *frame) {
 	return 0;
 }
 
+bool us_is_jpeg(uint format) {
+	return (format == V4L2_PIX_FMT_JPEG || format == V4L2_PIX_FMT_MJPEG);
+}
+
 const char *us_fourcc_to_string(uint format, char *buf, uz size) {
 	assert(size >= 8);
 	buf[0] = format & 0x7F;

src/libs/frame.h

@@ -22,8 +22,6 @@
 
 #pragma once
 
-#include <linux/videodev2.h>
-
 #include "types.h"
 #include "tools.h"
 
@@ -41,7 +39,6 @@ typedef struct {
 	// Stride is a bytesperline in V4L2
 	// https://www.kernel.org/doc/html/v4.14/media/uapi/v4l/pixfmt-v4l2.html
 	// https://medium.com/@oleg.shipitko/what-does-stride-mean-in-image-processing-bba158a72bcd
-
 	bool	online;
 	bool	key;
 	uint	gop;
@@ -60,17 +57,16 @@ typedef struct {
 		x_dest->online = x_src->online; \
 		x_dest->key = x_src->key; \
 		x_dest->gop = x_src->gop; \
+		\
 		x_dest->grab_ts = x_src->grab_ts; \
 		x_dest->encode_begin_ts = x_src->encode_begin_ts; \
 		x_dest->encode_end_ts = x_src->encode_end_ts; \
 	}
 
-static inline void us_frame_copy_meta(const us_frame_s *src, us_frame_s *dest) {
-	US_FRAME_COPY_META(src, dest);
-}
-
-#define US_FRAME_COMPARE_META_USED_NOTS(x_a, x_b) ( \
+#define US_FRAME_COMPARE_GEOMETRY(x_a, x_b) ( \
+		/* Compare the used size and significant meta (no timings) */ \
 		x_a->used == x_b->used \
+		\
 		&& x_a->width == x_b->width \
 		&& x_a->height == x_b->height \
 		&& x_a->format == x_b->format \
@@ -83,7 +79,7 @@ static inline void us_frame_copy_meta(const us_frame_s *src, us_frame_s *dest) {
 
 static inline void us_frame_encoding_begin(const us_frame_s *src, us_frame_s *dest, uint format) {
 	assert(src->used > 0);
-	us_frame_copy_meta(src, dest);
+	US_FRAME_COPY_META(src, dest);
 	dest->encode_begin_ts = us_get_now_monotonic();
 	dest->format = format;
 	dest->stride = 0;
@@ -108,8 +104,5 @@ bool us_frame_compare(const us_frame_s *a, const us_frame_s *b);
 
 uint us_frame_get_padding(const us_frame_s *frame);
 
+bool us_is_jpeg(uint format);
 const char *us_fourcc_to_string(uint format, char *buf, uz size);
-
-static inline bool us_is_jpeg(uint format) {
-	return (format == V4L2_PIX_FMT_JPEG || format == V4L2_PIX_FMT_MJPEG);
-}

src/libs/frametext.c

@@ -20,7 +20,7 @@
 *****************************************************************************/
 
 
-#include "ftext.h"
+#include "frametext.h"
 
 #include <string.h>
 
@@ -28,32 +28,62 @@
 
 #include <linux/videodev2.h>
 
-#include "../libs/tools.h"
-#include "../libs/frame.h"
-
-#include "ftext_font.h"
+#include "tools.h"
+#include "frame.h"
+#include "frametext_font.h"
 
 
-static void _ftext_draw_line(
-	us_ftext_s *ft, const char *line,
+static void _frametext_draw_line(
+	us_frametext_s *ft, const char *line,
 	uint scale_x, uint scale_y,
 	uint start_x, uint start_y);
 
 
-us_ftext_s *us_ftext_init(void) {
-	us_ftext_s *ft;
+us_frametext_s *us_frametext_init(void) {
+	us_frametext_s *ft;
 	US_CALLOC(ft, 1);
 	ft->frame = us_frame_init();
 	return ft;
 }
 
-void us_ftext_destroy(us_ftext_s *ft) {
+void us_frametext_destroy(us_frametext_s *ft) {
 	us_frame_destroy(ft->frame);
 	US_DELETE(ft->text, free);
 	free(ft);
 }
 
-void us_ftext_draw(us_ftext_s *ft, const char *text, uint width, uint height) {
+/*
+Every character in the font is encoded row-wise in 8 bytes.
+The least significant bit of each byte corresponds to the first pixel in a row. 
+The character 'A' (0x41 / 65) is encoded as { 0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00}
+
+    0x0C => 0000 1100 => ..XX....
+    0X1E => 0001 1110 => .XXXX...
+    0x33 => 0011 0011 => XX..XX..
+    0x33 => 0011 0011 => XX..XX..
+    0x3F => 0011 1111 => xxxxxx..
+    0x33 => 0011 0011 => XX..XX..
+    0x33 => 0011 0011 => XX..XX..
+    0x00 => 0000 0000 => ........
+
+To access the nth pixel in a row, right-shift by n.
+
+                         . . X X . . . .
+                         | | | | | | | |
+    (0x0C >> 0) & 1 == 0-+ | | | | | | |
+    (0x0C >> 1) & 1 == 0---+ | | | | | |
+    (0x0C >> 2) & 1 == 1-----+ | | | | |
+    (0x0C >> 3) & 1 == 1-------+ | | | |
+    (0x0C >> 4) & 1 == 0---------+ | | |
+    (0x0C >> 5) & 1 == 0-----------+ | |
+    (0x0C >> 6) & 1 == 0-------------+ |
+    (0x0C >> 7) & 1 == 0---------------+
+*/
+
+void us_frametext_draw(us_frametext_s *ft, const char *text, uint width, uint height) {
+	assert(width > 0);
+	assert(height > 0);
+
 	us_frame_s *const frame = ft->frame;
 
 	if (
@@ -110,7 +140,7 @@ void us_ftext_draw(us_ftext_s *ft, const char *text, uint width, uint height) {
 		const uint start_x = (frame->width >= line_width
 			? ((frame->width - line_width) / 2)
 			: 0);
-		_ftext_draw_line(ft, line, scale_x, scale_y, start_x, start_y + n_line * 8 * scale_y);
+		_frametext_draw_line(ft, line, scale_x, scale_y, start_x, start_y + n_line * 8 * scale_y);
 		++n_line;
 	}
 
@@ -118,8 +148,8 @@ empty:
 	free(str);
 }
 
-void _ftext_draw_line(
-	us_ftext_s *ft, const char *line,
+void _frametext_draw_line(
+	us_frametext_s *ft, const char *line,
 	uint scale_x, uint scale_y,
 	uint start_x, uint start_y) {
 
@@ -139,16 +169,16 @@ void _ftext_draw_line(
 				break;
 			}
 
-			const u8 ch = US_MIN((u8)line[ch_x / 8 / scale_x], sizeof(US_FTEXT_FONT) / 8 - 1);
+			const u8 ch = US_MIN((u8)line[ch_x / 8 / scale_x], sizeof(US_FRAMETEXT_FONT) / 8 - 1);
 			const uint ch_byte = (ch_y / scale_y) % 8;
 			const uint ch_bit = (ch_x / scale_x) % 8;
-			const bool pix_on = !!(US_FTEXT_FONT[ch][ch_byte] & (1 << ch_bit));
+			const bool pix_on = !!(US_FRAMETEXT_FONT[ch][ch_byte] & (1 << ch_bit));
 
-			u8 *const b = &frame->data[offset]; // XXX: Big endian for Raspberry
-			u8 *const g = b + 1;
-			u8 *const r = g + 1;
+			u8 *const r = &frame->data[offset];
+			u8 *const g = r + 1;
+			u8 *const b = r + 2;
 
-			*r = pix_on * 0x51;
+			*r = pix_on * 0x65; // RGB/BGR-friendly
 			*g = pix_on * 0x65;
 			*b = pix_on * 0x65;
 		}

src/libs/frametext.h

@@ -23,17 +23,17 @@
 #pragma once
 
 
-#include "../libs/types.h"
-#include "../libs/frame.h"
+#include "types.h"
+#include "frame.h"
 
 
 typedef struct {
 	char		*text;
 	us_frame_s	*frame;
-} us_ftext_s;
+} us_frametext_s;
 
 
-us_ftext_s *us_ftext_init(void);
-void us_ftext_destroy(us_ftext_s *ft);
+us_frametext_s *us_frametext_init(void);
+void us_frametext_destroy(us_frametext_s *ft);
 
-void us_ftext_draw(us_ftext_s *ft, const char *text, uint width, uint height);
+void us_frametext_draw(us_frametext_s *ft, const char *text, uint width, uint height);

src/libs/frametext_font.c

@@ -20,11 +20,15 @@
 *****************************************************************************/
 
 
-#include "ftext_font.h"
+#include "frametext_font.h"
+
+#include "types.h"
 
 
-const u8 US_FTEXT_FONT[128][8] = {
+const u8 US_FRAMETEXT_FONT[128][8] = {
 	// https://github.com/dhepper/font8x8/blob/master/font8x8_basic.h
+	// Author: Daniel Hepper <daniel@hepper.net>
+	// License: Public Domain
 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0000 (nul)
 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0001
 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0002

src/libs/frametext_font.h

@@ -22,7 +22,7 @@
 
 #pragma once
 
-#include "../libs/types.h"
+#include "types.h"
 
 
-extern const u8 US_FTEXT_FONT[128][8];
+extern const u8 US_FRAMETEXT_FONT[128][8];

src/libs/memsink.c

@@ -101,16 +101,35 @@ void us_memsink_destroy(us_memsink_s *sink) {
 }
 
 bool us_memsink_server_check(us_memsink_s *sink, const us_frame_s *frame) {
-	// Return true (the need to write to memsink) on any of these conditions:
-	//   - EWOULDBLOCK - we have an active client;
-	//   - Incorrect magic or version - need to first write;
-	//   - We have some active clients by last_client_ts;
-	//   - Frame meta differs (like size, format, but not timestamp).
+	// Если frame == NULL, то только проверяем наличие клиентов
+	// или необходимость инициализировать память.
 
 	assert(sink->server);
 
+	if (sink->mem->magic != US_MEMSINK_MAGIC || sink->mem->version != US_MEMSINK_VERSION) {
+		// Если регион памяти не был инициализирован, то нужно что-то туда положить.
+		// Блокировка не нужна, потому что только сервер пишет в эти переменные.
+		return true;
+	}
+
+	const ldf unsafe_ts = sink->mem->last_client_ts;
+	if (unsafe_ts != sink->unsafe_last_client_ts) {
+		// Клиент пишет в синке свою отметку last_client_ts при любом действии.
+		// Мы не берем блокировку здесь, а просто проверяем, является ли это число тем же самым,
+		// что было прочитано нами в предыдущих итерациях. Значению не нужно быть консистентным,
+		// и даже если мы прочитали мусор из-за гонки в памяти между чтением здеси и записью
+		// из клиента, мы все равно можем сделать вывод, есть ли у нас клиенты вообще.
+		// Если число число поменялось то у нас точно есть клиенты и дальнейшие проверки
+		// проводить не требуется. Если же число неизменно, то стоит поставить блокировку
+		// и проверить, нужно ли записать что-нибудь в память для инициализации фрейма.
+		sink->unsafe_last_client_ts = unsafe_ts;
+		atomic_store(&sink->has_clients, true);
+		return true;
+	}
+
 	if (flock(sink->fd, LOCK_EX | LOCK_NB) < 0) {
 		if (errno == EWOULDBLOCK) {
+			// Есть живой клиент, который прямо сейчас взял блокировку и читает фрейм из синка
 			atomic_store(&sink->has_clients, true);
 			return true;
 		}
@@ -118,10 +137,7 @@ bool us_memsink_server_check(us_memsink_s *sink, const us_frame_s *frame) {
 		return false;
 	}
 
-	if (sink->mem->magic != US_MEMSINK_MAGIC || sink->mem->version != US_MEMSINK_VERSION) {
-		return true;
-	}
-
+	// Проверяем, есть ли у нас живой клиент по таймауту
 	const bool has_clients = (sink->mem->last_client_ts + sink->client_ttl > us_get_now_monotonic());
 	atomic_store(&sink->has_clients, has_clients);
 
@@ -129,13 +145,20 @@ bool us_memsink_server_check(us_memsink_s *sink, const us_frame_s *frame) {
 		US_LOG_PERROR("%s-sink: Can't unlock memory", sink->name);
 		return false;
 	}
-	return (has_clients || !US_FRAME_COMPARE_META_USED_NOTS(sink->mem, frame));;
+	if (has_clients) {
+		return true;
+	}
+	if (frame != NULL && !US_FRAME_COMPARE_GEOMETRY(sink->mem, frame)) {
+		// Если есть изменения в геометрии/формате фрейма, то их тоже нобходимо сразу записать в синк
+		return true;
+	}
+	return false;
 }
 
 int us_memsink_server_put(us_memsink_s *sink, const us_frame_s *frame, bool *key_requested) {
 	assert(sink->server);
 
-	const long double now = us_get_now_monotonic();
+	const ldf now = us_get_now_monotonic();
 
 	if (frame->used > US_MEMSINK_MAX_DATA) {
 		US_LOG_ERROR("%s-sink: Can't put frame: is too big (%zu > %zu)",
@@ -146,12 +169,13 @@ int us_memsink_server_put(us_memsink_s *sink, const us_frame_s *frame, bool *key
 	if (us_flock_timedwait_monotonic(sink->fd, 1) == 0) {
 		US_LOG_VERBOSE("%s-sink: >>>>> Exposing new frame ...", sink->name);
 
-		sink->last_id = us_get_now_id();
-		sink->mem->id = sink->last_id;
+		sink->mem->id = us_get_now_id();
 		if (sink->mem->key_requested && frame->key) {
 			sink->mem->key_requested = false;
 		}
-		*key_requested = sink->mem->key_requested;
+		if (key_requested != NULL) { // We don't need it for non-H264 sinks
+			*key_requested = sink->mem->key_requested;
+		}
 
 		memcpy(sink->mem->data, frame->data, frame->used);
 		sink->mem->used = frame->used;
@@ -179,7 +203,7 @@ int us_memsink_server_put(us_memsink_s *sink, const us_frame_s *frame, bool *key
 	return 0;
 }
 
-int us_memsink_client_get(us_memsink_s *sink, us_frame_s *frame, bool *key_requested, bool key_required) { // cppcheck-suppress unusedFunction
+int us_memsink_client_get(us_memsink_s *sink, us_frame_s *frame, bool *key_requested, bool key_required) {
 	assert(!sink->server); // Client only
 
 	if (us_flock_timedwait_monotonic(sink->fd, sink->timeout) < 0) {
@@ -190,26 +214,35 @@ int us_memsink_client_get(us_memsink_s *sink, us_frame_s *frame, bool *key_reque
 		return -1;
 	}
 
-	int retval = -2; // Not updated
+	int retval = 0;
 
-	if (sink->mem->magic == US_MEMSINK_MAGIC) {
-		if (sink->mem->version != US_MEMSINK_VERSION) {
-			US_LOG_ERROR("%s-sink: Protocol version mismatch: sink=%u, required=%u",
-				sink->name, sink->mem->version, US_MEMSINK_VERSION);
-			retval = -1;
-			goto done;
-		}
-		if (sink->mem->id != sink->last_id) { // When updated
-			sink->last_id = sink->mem->id;
-			us_frame_set_data(frame, sink->mem->data, sink->mem->used);
-			US_FRAME_COPY_META(sink->mem, frame);
-			*key_requested = sink->mem->key_requested;
-			retval = 0;
-		}
-		sink->mem->last_client_ts = us_get_now_monotonic();
-		if (key_required) {
-			sink->mem->key_requested = true;
-		}
+	if (sink->mem->magic != US_MEMSINK_MAGIC) {
+		retval = -2; // Not updated
+		goto done;
+	}
+	if (sink->mem->version != US_MEMSINK_VERSION) {
+		US_LOG_ERROR("%s-sink: Protocol version mismatch: sink=%u, required=%u",
+			sink->name, sink->mem->version, US_MEMSINK_VERSION);
+		retval = -1;
+		goto done;
+	}
+
+	// Let the sink know that the client is alive
+	sink->mem->last_client_ts = us_get_now_monotonic();
+
+	if (sink->mem->id == sink->last_readed_id) {
+		retval = -2; // Not updated
+		goto done;
+	}
+
+	sink->last_readed_id = sink->mem->id;
+	us_frame_set_data(frame, sink->mem->data, sink->mem->used);
+	US_FRAME_COPY_META(sink->mem, frame);
+	if (key_requested != NULL) { // We don't need it for non-H264 sinks
+		*key_requested = sink->mem->key_requested;
+	}
+	if (key_required) {
+		sink->mem->key_requested = true;
 	}
 
 done:

src/libs/memsink.h

@@ -41,8 +41,11 @@ typedef struct {
 
 	int					fd;
 	us_memsink_shared_s	*mem;
-	u64					last_id;
-	atomic_bool			has_clients; // Only for server
+
+	u64			last_readed_id; // Only for client
+
+	atomic_bool	has_clients; // Only for server results
+	ldf			unsafe_last_client_ts; // Only for server
 } us_memsink_s;
 
 

src/libs/queue.c

@@ -28,9 +28,9 @@
 
 #include <pthread.h>
 
-#include "uslibs/types.h"
-#include "uslibs/tools.h"
-#include "uslibs/threading.h"
+#include "types.h"
+#include "tools.h"
+#include "threading.h"
 
 
 us_queue_s *us_queue_init(uint capacity) {
@@ -104,9 +104,9 @@ int us_queue_get(us_queue_s *queue, void **item, ldf timeout) {
 
 #undef _WAIT_OR_UNLOCK
 
-int us_queue_get_free(us_queue_s *queue) {
+bool us_queue_is_empty(us_queue_s *queue) {
 	US_MUTEX_LOCK(queue->mutex);
 	const uint size = queue->size;
 	US_MUTEX_UNLOCK(queue->mutex);
-	return queue->capacity - size;
+	return (bool)(queue->capacity - size);
 }

src/libs/queue.h

@@ -24,8 +24,8 @@
 
 #include <pthread.h>
 
-#include "uslibs/types.h"
-#include "uslibs/tools.h"
+#include "types.h"
+#include "tools.h"
 
 
 // Based on https://github.com/seifzadeh/c-pthread-queue/blob/master/queue.h
@@ -45,7 +45,7 @@ typedef struct {
 
 #define US_QUEUE_DELETE_WITH_ITEMS(x_queue, x_free_item) { \
 		if (x_queue) { \
-			while (!us_queue_get_free(x_queue)) { \
+			while (!us_queue_is_empty(x_queue)) { \
 				void *m_ptr; \
 				if (!us_queue_get(x_queue, &m_ptr, 0)) { \
 					US_DELETE(m_ptr, x_free_item); \
@@ -61,4 +61,4 @@ void us_queue_destroy(us_queue_s *queue);
 
 int us_queue_put(us_queue_s *queue, void *item, ldf timeout);
 int us_queue_get(us_queue_s *queue, void **item, ldf timeout);
-int us_queue_get_free(us_queue_s *queue);
+bool us_queue_is_empty(us_queue_s *queue);

src/libs/ring.c

@@ -0,0 +1,86 @@
+/*****************************************************************************
+#                                                                            #
+#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
+#                                                                            #
+#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#include <assert.h>
+
+#include "ring.h"
+
+#include "types.h"
+#include "tools.h"
+#include "queue.h"
+
+
+int _acquire(us_ring_s *ring, us_queue_s *queue, ldf timeout);
+void _release(us_ring_s *ring, us_queue_s *queue, uint index);
+
+
+us_ring_s *us_ring_init(uint capacity) {
+	us_ring_s *ring;
+	US_CALLOC(ring, 1);
+	US_CALLOC(ring->items, capacity);
+	US_CALLOC(ring->places, capacity);
+	ring->capacity = capacity;
+	ring->producer = us_queue_init(capacity);
+	ring->consumer = us_queue_init(capacity);
+	for (uint index = 0; index < capacity; ++index) {
+		ring->places[index] = index; // XXX: Just to avoid casting between pointer and uint
+		assert(!us_queue_put(ring->producer, (void*)(ring->places + index), 0));
+	}
+	return ring;
+}
+
+void us_ring_destroy(us_ring_s *ring) {
+	us_queue_destroy(ring->consumer);
+	us_queue_destroy(ring->producer);
+	free(ring->places);
+	free(ring->items);
+	free(ring);
+}
+
+int us_ring_producer_acquire(us_ring_s *ring, ldf timeout) {
+	return _acquire(ring, ring->producer, timeout);
+}
+
+void us_ring_producer_release(us_ring_s *ring, uint index) {
+	_release(ring, ring->consumer, index);
+}
+
+int us_ring_consumer_acquire(us_ring_s *ring, ldf timeout) {
+	return _acquire(ring, ring->consumer, timeout);
+}
+
+void us_ring_consumer_release(us_ring_s *ring, uint index) {
+	_release(ring, ring->producer, index);
+}
+
+int _acquire(us_ring_s *ring, us_queue_s *queue, ldf timeout) {
+	(void)ring;
+	uint *place;
+	if (us_queue_get(queue, (void**)&place, timeout) < 0) {
+		return -1;
+	}
+	return *place;
+}
+
+void _release(us_ring_s *ring, us_queue_s *queue, uint index) {
+	assert(!us_queue_put(queue, (void*)(ring->places + index), 0));
+}

src/libs/ring.h

@@ -0,0 +1,63 @@
+/*****************************************************************************
+#                                                                            #
+#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
+#                                                                            #
+#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#pragma once
+
+
+#include "types.h"
+#include "queue.h"
+
+
+typedef struct {
+	uz			capacity;
+	void		**items;
+	uint		*places;
+	us_queue_s	*producer;
+	us_queue_s	*consumer;
+} us_ring_s;
+
+
+#define US_RING_INIT_WITH_ITEMS(x_ring, x_capacity, x_init_item) { \
+		(x_ring) = us_ring_init(x_capacity); \
+		for (uz m_index = 0; m_index < (x_ring)->capacity; ++m_index) { \
+			(x_ring)->items[m_index] = x_init_item(); \
+		} \
+	}
+
+#define US_RING_DELETE_WITH_ITEMS(x_ring, x_destroy_item) { \
+		if (x_ring) { \
+			for (uz m_index = 0; m_index < (x_ring)->capacity; ++m_index) { \
+				x_destroy_item((x_ring)->items[m_index]); \
+			} \
+			us_ring_destroy(x_ring); \
+		} \
+	}
+
+
+us_ring_s *us_ring_init(uint capacity);
+void us_ring_destroy(us_ring_s *ring);
+
+int us_ring_producer_acquire(us_ring_s *ring, ldf timeout);
+void us_ring_producer_release(us_ring_s *ring, uint index);
+
+int us_ring_consumer_acquire(us_ring_s *ring, ldf timeout);
+void us_ring_consumer_release(us_ring_s *ring, uint index);

src/libs/signal.c

@@ -0,0 +1,82 @@
+/*****************************************************************************
+#                                                                            #
+#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
+#                                                                            #
+#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#include "signal.h"
+
+#include <string.h>
+#include <signal.h>
+#include <assert.h>
+
+#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 32
+#	define HAS_SIGABBREV_NP
+#endif
+
+#include "types.h"
+#include "tools.h"
+#include "logging.h"
+
+
+char *us_signum_to_string(int signum) {
+#	ifdef HAS_SIGABBREV_NP
+	const char *const name = sigabbrev_np(signum);
+#	else
+	const char *const name = (
+		signum == SIGTERM ? "TERM" :
+		signum == SIGINT ? "INT" :
+		signum == SIGPIPE ? "PIPE" :
+		NULL
+	);
+#	endif
+	char *buf;
+	if (name != NULL) {
+		US_ASPRINTF(buf, "SIG%s", name);
+	} else {
+		US_ASPRINTF(buf, "SIG[%d]", signum);
+	}
+	return buf;
+}
+
+void us_install_signals_handler(us_signal_handler_f handler, bool ignore_sigpipe) {
+	struct sigaction sig_act = {0};
+
+	assert(!sigemptyset(&sig_act.sa_mask));
+	sig_act.sa_handler = handler;
+	assert(!sigaddset(&sig_act.sa_mask, SIGINT));
+	assert(!sigaddset(&sig_act.sa_mask, SIGTERM));
+	if (!ignore_sigpipe) {
+	    assert(!sigaddset(&sig_act.sa_mask, SIGPIPE));
+	}
+
+	US_LOG_DEBUG("Installing SIGINT handler ...");
+	assert(!sigaction(SIGINT, &sig_act, NULL));
+
+	US_LOG_DEBUG("Installing SIGTERM handler ...");
+	assert(!sigaction(SIGTERM, &sig_act, NULL));
+
+	if (!ignore_sigpipe) {
+		US_LOG_DEBUG("Installing SIGPIPE handler ...");
+		assert(!sigaction(SIGPIPE, &sig_act, NULL));
+	} else {
+		US_LOG_DEBUG("Ignoring SIGPIPE ...");
+		assert(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
+	}
+}

src/libs/signal.h

@@ -22,13 +22,11 @@
 
 #pragma once
 
-#include <stdint.h>
-
-#include <sys/types.h>
+#include "types.h"
 
 
-extern const unsigned US_BLANK_JPEG_WIDTH;
-extern const unsigned US_BLANK_JPEG_HEIGHT;
+typedef void (*us_signal_handler_f)(int);
 
-extern const size_t US_BLANK_JPEG_DATA_SIZE;
-extern const uint8_t US_BLANK_JPEG_DATA[];
+
+char *us_signum_to_string(int signum);
+void us_install_signals_handler(us_signal_handler_f handler, bool ignore_sigpipe);

src/libs/tc358743.c

@@ -28,11 +28,9 @@
 #include <linux/videodev2.h>
 #include <linux/v4l2-controls.h>
 
-#include "uslibs/types.h"
-#include "uslibs/tools.h"
-#include "uslibs/xioctl.h"
-
-#include "logging.h"
+#include "types.h"
+#include "tools.h"
+#include "xioctl.h"
 
 
 #ifndef V4L2_CID_USER_TC358743_BASE
@@ -46,28 +44,22 @@
 #endif
 
 
-int us_tc358743_read_info(const char *path, us_tc358743_info_s *info) {
-	US_MEMSET_ZERO(*info);
+int us_tc358743_xioctl_get_audio_hz(int fd, uint *audio_hz) {
+	*audio_hz = 0;
 
-	int fd = -1;
-	if ((fd = open(path, O_RDWR)) < 0) {
-		US_JLOG_PERROR("audio", "Can't open TC358743 V4L2 device");
+	struct v4l2_control ctl = {.id = TC358743_CID_AUDIO_PRESENT};
+	if (us_xioctl(fd, VIDIOC_G_CTRL, &ctl) < 0) {
 		return -1;
 	}
+	if (!ctl.value) {
+		return 0; // No audio
+	}
 
-#	define READ_CID(x_cid, x_field) { \
-			struct v4l2_control m_ctl = {.id = x_cid}; \
-			if (us_xioctl(fd, VIDIOC_G_CTRL, &m_ctl) < 0) { \
-				US_JLOG_PERROR("audio", "Can't get value of " #x_cid); \
-				close(fd); \
-				return -1; \
-			} \
-			info->x_field = m_ctl.value; \
-		}
-	READ_CID(TC358743_CID_AUDIO_PRESENT,		has_audio);
-	READ_CID(TC358743_CID_AUDIO_SAMPLING_RATE,	audio_hz);
-#	undef READ_CID
-
-	close(fd);
+	US_MEMSET_ZERO(ctl);
+	ctl.id = TC358743_CID_AUDIO_SAMPLING_RATE;
+	if (us_xioctl(fd, VIDIOC_G_CTRL, &ctl) < 0) {
+		return -2;
+	}
+	*audio_hz = ctl.value;
 	return 0;
 }

src/libs/tc358743.h

@@ -22,13 +22,7 @@
 
 #pragma once
 
-#include "uslibs/types.h"
+#include "types.h"
 
 
-typedef struct {
-	bool	has_audio;
-	uint	audio_hz;
-} us_tc358743_info_s;
-
-
-int us_tc358743_read_info(const char *path, us_tc358743_info_s *info);
+int us_tc358743_xioctl_get_audio_hz(int fd, uint *audio_hz);

src/libs/threading.h

@@ -24,6 +24,7 @@
 
 #include <stdio.h>
 #include <unistd.h>
+#include <signal.h>
 #include <assert.h>
 
 #include <sys/syscall.h>
@@ -56,9 +57,14 @@
 			us_thread_set_name(m_new_tname_buf); \
 		}
 #else
-#	define US_THREAD_RENAME(_fmt, ...)
+#	define US_THREAD_RENAME(x_fmt, ...)
 #endif
 
+#define US_THREAD_SETTLE(x_fmt, ...) { \
+		US_THREAD_RENAME((x_fmt), ##__VA_ARGS__); \
+		us_thread_block_signals(); \
+	}
+
 #define US_MUTEX_INIT(x_mutex)		assert(!pthread_mutex_init(&(x_mutex), NULL))
 #define US_MUTEX_DESTROY(x_mutex)	assert(!pthread_mutex_destroy(&(x_mutex)))
 #define US_MUTEX_LOCK(x_mutex)		assert(!pthread_mutex_lock(&(x_mutex)))
@@ -124,3 +130,11 @@ INLINE void us_thread_get_name(char *name) { // Always required for logging
 	}
 #endif
 }
+
+INLINE void us_thread_block_signals(void) {
+	sigset_t mask;
+	assert(!sigemptyset(&mask));
+	assert(!sigaddset(&mask, SIGINT));
+	assert(!sigaddset(&mask, SIGTERM));
+	assert(!pthread_sigmask(SIG_BLOCK, &mask, NULL));
+}

src/libs/tools.h

@@ -27,6 +27,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <limits.h>
+#include <locale.h> // Make C locale for strerror_l()
 #include <errno.h>
 #include <math.h>
 #include <time.h>
@@ -34,12 +35,6 @@
 
 #include <sys/file.h>
 
-#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 32
-#	define HAS_SIGABBREV_NP
-#else
-#	include <signal.h>
-#endif
-
 #include "types.h"
 
 
@@ -59,7 +54,7 @@
 #define US_CALLOC(x_dest, x_nmemb)		assert(((x_dest) = calloc((x_nmemb), sizeof(*(x_dest)))) != NULL)
 #define US_REALLOC(x_dest, x_nmemb)		assert(((x_dest) = realloc((x_dest), (x_nmemb) * sizeof(*(x_dest)))) != NULL)
 #define US_DELETE(x_dest, x_free)		{ if (x_dest) { x_free(x_dest); x_dest = NULL; } }
-#define US_CLOSE_FD(x_dest, x_close)	{ if (x_dest >= 0) { x_close(x_dest); x_dest = -1; } }
+#define US_CLOSE_FD(x_dest)				{ if (x_dest >= 0) { close(x_dest); x_dest = -1; } }
 #define US_MEMSET_ZERO(x_obj)			memset(&(x_obj), 0, sizeof(x_obj))
 
 #define US_SNPRINTF(x_dest, x_size, x_fmt, ...)	assert(snprintf((x_dest), (x_size), (x_fmt), ##__VA_ARGS__) > 0)
@@ -77,6 +72,14 @@
 		(m_a > m_b ? m_a : m_b); \
 	})
 
+#define US_ONCE(...) { \
+		const int m_reported = __LINE__; \
+		if (m_reported != once) { \
+			__VA_ARGS__; \
+			once = m_reported; \
+		} \
+	}
+
 
 INLINE char *us_strdup(const char *str) {
 	char *const new = strdup(str);
@@ -181,34 +184,26 @@ INLINE int us_flock_timedwait_monotonic(int fd, ldf timeout) {
 }
 
 INLINE char *us_errno_to_string(int error) {
+#	if (_POSIX_C_SOURCE >= 200112L) && !defined(_GNU_SOURCE) // XSI
 	char buf[2048];
 	const uz max_len = sizeof(buf) - 1;
-#	if (_POSIX_C_SOURCE >= 200112L) && ! _GNU_SOURCE
 	if (strerror_r(error, buf, max_len) != 0) {
 		US_SNPRINTF(buf, max_len, "Errno = %d", error);
 	}
 	return us_strdup(buf);
-#	else
-	return us_strdup(strerror_r(error, buf, max_len));
-#	endif
-}
 
-INLINE char *us_signum_to_string(int signum) {
-#	ifdef HAS_SIGABBREV_NP
-	const char *const name = sigabbrev_np(signum);
-#	else
-	const char *const name = (
-		signum == SIGTERM ? "TERM" :
-		signum == SIGINT ? "INT" :
-		signum == SIGPIPE ? "PIPE" :
-		NULL
-	);
-#	endif
-	char *buf;
-	if (name != NULL) {
-		US_ASPRINTF(buf, "SIG%s", name);
-	} else {
-		US_ASPRINTF(buf, "SIG[%d]", signum);
+#	elif defined(__GLIBC__) && defined(_GNU_SOURCE) // GNU
+	char buf[2048];
+	const uz max_len = sizeof(buf) - 1;
+	return us_strdup(strerror_r(error, buf, max_len));
+
+#	else // BSD
+	locale_t locale = newlocale(LC_MESSAGES_MASK, "C", NULL);
+	if (locale) {
+		char *ptr = us_strdup(strerror_l(error, locale));
+		freelocale(locale);
+		return ptr;
 	}
-	return buf;
+	return us_strdup("!!! newlocale() error !!!");
+#	endif
 }

src/libs/unjpeg.c

@@ -54,7 +54,7 @@ int us_unjpeg(const us_frame_s *src, us_frame_s *dest, bool decode) {
 
 	// https://stackoverflow.com/questions/19857766/error-handling-in-libjpeg
 	_jpeg_error_manager_s jpeg_error;
-	jpeg.err = jpeg_std_error((struct jpeg_error_mgr *)&jpeg_error);
+	jpeg.err = jpeg_std_error((struct jpeg_error_mgr*)&jpeg_error);
 	jpeg_error.mgr.error_exit = _jpeg_error_handler;
 	jpeg_error.frame = src;
 	if (setjmp(jpeg_error.jmp) < 0) {
@@ -68,12 +68,12 @@ int us_unjpeg(const us_frame_s *src, us_frame_s *dest, bool decode) {
 
 	jpeg_start_decompress(&jpeg);
 
-	us_frame_copy_meta(src, dest);
-	dest->format = V4L2_PIX_FMT_RGB24;
-	dest->width = jpeg.output_width;
-	dest->height = jpeg.output_height;
-	dest->stride = jpeg.output_width * jpeg.output_components; // Row stride
-	dest->used = 0;
+	US_FRAME_COPY_META(src, dest); // cppcheck-suppress redundantAssignment
+	dest->format = V4L2_PIX_FMT_RGB24; // cppcheck-suppress redundantAssignment
+	dest->width = jpeg.output_width; // cppcheck-suppress redundantAssignment
+	dest->height = jpeg.output_height; // cppcheck-suppress redundantAssignment
+	dest->stride = jpeg.output_width * jpeg.output_components; // cppcheck-suppress redundantAssignment
+	dest->used = 0; // cppcheck-suppress redundantAssignment
 
 	if (decode) {
 		JSAMPARRAY scanlines;
@@ -94,7 +94,7 @@ done:
 }
 
 static void _jpeg_error_handler(j_common_ptr jpeg) {
-	_jpeg_error_manager_s *jpeg_error = (_jpeg_error_manager_s *)jpeg->err;
+	_jpeg_error_manager_s *jpeg_error = (_jpeg_error_manager_s*)jpeg->err;
 	char msg[JMSG_LENGTH_MAX];
 
 	(*jpeg_error->mgr.format_message)(jpeg, msg);

src/ustreamer/blank.c

@@ -22,81 +22,31 @@
 
 #include "blank.h"
 
+#include "../libs/types.h"
+#include "../libs/tools.h"
+#include "../libs/frame.h"
+#include "../libs/frametext.h"
 
-static us_frame_s *_init_internal(void);
-static us_frame_s *_init_external(const char *path);
+#include "encoders/cpu/encoder.h"
 
 
-us_frame_s *us_blank_frame_init(const char *path) {
-	us_frame_s *blank = NULL;
-
-	if (path && path[0] != '\0') {
-		blank = _init_external(path);
-	}
-
-	if (blank != NULL) {
-		US_LOG_INFO("Using external blank placeholder: %s", path);
-	} else {
-		blank = _init_internal();
-		US_LOG_INFO("Using internal blank placeholder");
-	}
+us_blank_s *us_blank_init(void) {
+	us_blank_s *blank;
+	US_CALLOC(blank, 1);
+	blank->ft = us_frametext_init();
+	blank->raw = blank->ft->frame;
+	blank->jpeg = us_frame_init();
+	us_blank_draw(blank, "< NO SIGNAL >", 640, 480);
 	return blank;
 }
 
-static us_frame_s *_init_internal(void) {
-	us_frame_s *const blank = us_frame_init();
-	us_frame_set_data(blank, US_BLANK_JPEG_DATA, US_BLANK_JPEG_DATA_SIZE);
-	blank->width = US_BLANK_JPEG_WIDTH;
-	blank->height = US_BLANK_JPEG_HEIGHT;
-	blank->format = V4L2_PIX_FMT_JPEG;
-	return blank;
+void us_blank_draw(us_blank_s *blank, const char *text, uint width, uint height) {
+	us_frametext_draw(blank->ft, text, width, height);
+	us_cpu_encoder_compress(blank->raw, blank->jpeg, 95);
 }
 
-static us_frame_s *_init_external(const char *path) {
-	FILE *fp = NULL;
-
-	us_frame_s *blank = us_frame_init();
-	blank->format = V4L2_PIX_FMT_JPEG;
-
-	if ((fp = fopen(path, "rb")) == NULL) {
-		US_LOG_PERROR("Can't open blank placeholder '%s'", path);
-		goto error;
-	}
-
-	const size_t chunk_size = 100 * 1024;
-	while (true) {
-		if (blank->used + chunk_size >= blank->allocated) {
-			us_frame_realloc_data(blank, blank->used + chunk_size * 2);
-		}
-
-		const size_t readed = fread(blank->data + blank->used, 1, chunk_size, fp);
-		blank->used += readed;
-
-		if (readed < chunk_size) {
-			if (feof(fp)) {
-				break;
-			} else {
-				US_LOG_PERROR("Can't read blank placeholder");
-				goto error;
-			}
-		}
-	}
-
-	us_frame_s *const decoded = us_frame_init();
-	if (us_unjpeg(blank, decoded, false) < 0) {
-		us_frame_destroy(decoded);
-		goto error;
-	}
-	blank->width = decoded->width;
-	blank->height = decoded->height;
-	us_frame_destroy(decoded);
-
-	goto ok;
-
-error:
-	US_DELETE(blank, us_frame_destroy);
-
-ok:
-	US_DELETE(fp, fclose);
-	return blank;
+void us_blank_destroy(us_blank_s *blank) {
+	us_frame_destroy(blank->jpeg);
+	us_frametext_destroy(blank->ft);
+	free(blank);
 }

src/ustreamer/blank.h

@@ -22,17 +22,19 @@
 
 #pragma once
 
-#include <stdio.h>
-#include <stdbool.h>
-
-#include <linux/videodev2.h>
-
-#include "../libs/tools.h"
-#include "../libs/logging.h"
+#include "../libs/types.h"
 #include "../libs/frame.h"
-#include "../libs/unjpeg.h"
-
-#include "data/blank_jpeg.h"
+#include "../libs/frametext.h"
 
 
-us_frame_s *us_blank_frame_init(const char *path);
+typedef struct {
+	us_frametext_s	*ft;
+	us_frame_s		*raw;
+	us_frame_s		*jpeg;
+} us_blank_s;
+
+
+us_blank_s *us_blank_init(void);
+void us_blank_destroy(us_blank_s *blank);
+
+void us_blank_draw(us_blank_s *blank, const char *text, uint width, uint height);

src/ustreamer/data/blank_jpeg.c

@@ -1,723 +0,0 @@
-/*****************************************************************************
-#                                                                            #
-#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
-#                                                                            #
-#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
-#                                                                            #
-#    This program is free software: you can redistribute it and/or modify    #
-#    it under the terms of the GNU General Public License as published by    #
-#    the Free Software Foundation, either version 3 of the License, or       #
-#    (at your option) any later version.                                     #
-#                                                                            #
-#    This program is distributed in the hope that it will be useful,         #
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
-#    GNU General Public License for more details.                            #
-#                                                                            #
-#    You should have received a copy of the GNU General Public License       #
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
-#                                                                            #
-*****************************************************************************/
-
-#include "blank_jpeg.h"
-
-
-const unsigned US_BLANK_JPEG_WIDTH = 640;
-const unsigned US_BLANK_JPEG_HEIGHT = 480;
-
-const size_t US_BLANK_JPEG_DATA_SIZE = 13845;
-const uint8_t US_BLANK_JPEG_DATA[] = {
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-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xD7, 0xAF, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xD0, 0xAF, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xD1, 0xAF, 0xFC, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xFF,
-	0xD2, 0xAF, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x07, 0xFF, 0xD9,
-};

src/ustreamer/encoder.c

@@ -73,13 +73,13 @@ void us_encoder_destroy(us_encoder_s *enc) {
 	free(enc);
 }
 
-us_encoder_type_e us_encoder_parse_type(const char *str) {
+int us_encoder_parse_type(const char *str) {
 	US_ARRAY_ITERATE(_ENCODER_TYPES, 0, item, {
 		if (!strcasecmp(item->name, str)) {
 			return item->type;
 		}
 	});
-	return US_ENCODER_TYPE_UNKNOWN;
+	return -1;
 }
 
 const char *us_encoder_type_to_string(us_encoder_type_e type) {
@@ -91,7 +91,9 @@ const char *us_encoder_type_to_string(us_encoder_type_e type) {
 	return _ENCODER_TYPES[0].name;
 }
 
-us_workers_pool_s *us_encoder_workers_pool_init(us_encoder_s *enc, us_device_s *dev) {
+void us_encoder_open(us_encoder_s *enc, us_device_s *dev) {
+	assert(enc->run->pool == NULL);
+
 #	define DR(x_next) dev->run->x_next
 
 	us_encoder_type_e type = (_ER(cpu_forced) ? US_ENCODER_TYPE_CPU : enc->type);
@@ -162,7 +164,7 @@ us_workers_pool_s *us_encoder_workers_pool_init(us_encoder_s *enc, us_device_s *
 			: 0
 		);
 
-		return us_workers_pool_init(
+		enc->run->pool = us_workers_pool_init(
 			"JPEG", "jw", n_workers, desired_interval,
 			_worker_job_init, (void *)enc,
 			_worker_job_destroy,
@@ -171,6 +173,11 @@ us_workers_pool_s *us_encoder_workers_pool_init(us_encoder_s *enc, us_device_s *
 #	undef DR
 }
 
+void us_encoder_close(us_encoder_s *enc) {
+	assert(enc->run->pool != NULL);
+	US_DELETE(enc->run->pool, us_workers_pool_destroy);
+}
+
 void us_encoder_get_runtime_params(us_encoder_s *enc, us_encoder_type_e *type, unsigned *quality) {
 	US_MUTEX_LOCK(_ER(mutex));
 	*type = _ER(type);
@@ -198,8 +205,6 @@ static bool _worker_run_job(us_worker_s *wr) {
 	const us_frame_s *src = &job->hw->raw;
 	us_frame_s *dest = job->dest;
 
-	assert(_ER(type) != US_ENCODER_TYPE_UNKNOWN);
-
 	if (_ER(type) == US_ENCODER_TYPE_CPU) {
 		US_LOG_VERBOSE("Compressing JPEG using CPU: worker=%s, buffer=%u",
 			wr->name, job->hw->buf.index);
@@ -223,6 +228,9 @@ static bool _worker_run_job(us_worker_s *wr) {
 		us_frame_encoding_begin(src, dest, V4L2_PIX_FMT_JPEG);
 		usleep(5000); // Просто чтобы работала логика desired_fps
 		dest->encode_end_ts = us_get_now_monotonic(); // us_frame_encoding_end()
+
+	} else {
+		assert(0 && "Unknown encoder type");
 	}
 
 	US_LOG_VERBOSE("Compressed new JPEG: size=%zu, time=%0.3Lf, worker=%s, buffer=%u",

src/ustreamer/encoder.h

@@ -47,7 +47,6 @@
 #define ENCODER_TYPES_STR "CPU, HW, M2M-VIDEO, M2M-IMAGE, NOOP"
 
 typedef enum {
-	US_ENCODER_TYPE_UNKNOWN, // Only for us_encoder_parse_type() and main()
 	US_ENCODER_TYPE_CPU,
 	US_ENCODER_TYPE_HW,
 	US_ENCODER_TYPE_M2M_VIDEO,
@@ -63,6 +62,8 @@ typedef struct {
 
 	unsigned			n_m2ms;
 	us_m2m_encoder_s	**m2ms;
+
+	us_workers_pool_s	*pool;
 } us_encoder_runtime_s;
 
 typedef struct {
@@ -83,10 +84,10 @@ typedef struct {
 us_encoder_s *us_encoder_init(void);
 void us_encoder_destroy(us_encoder_s *enc);
 
-us_encoder_type_e us_encoder_parse_type(const char *str);
+int us_encoder_parse_type(const char *str);
 const char *us_encoder_type_to_string(us_encoder_type_e type);
 
-us_workers_pool_s *us_encoder_workers_pool_init(us_encoder_s *enc, us_device_s *dev);
-void us_encoder_get_runtime_params(us_encoder_s *enc, us_encoder_type_e *type, unsigned *quality);
+void us_encoder_open(us_encoder_s *enc, us_device_s *dev);
+void us_encoder_close(us_encoder_s *enc);
 
-int us_encoder_compress(us_encoder_s *enc, unsigned worker_number, us_frame_s *src, us_frame_s *dest);
+void us_encoder_get_runtime_params(us_encoder_s *enc, us_encoder_type_e *type, unsigned *quality);

src/ustreamer/h264.c

@@ -22,8 +22,19 @@
 
 #include "h264.h"
 
+#include <stdatomic.h>
 
-us_h264_stream_s *us_h264_stream_init(us_memsink_s *sink, const char *path, unsigned bitrate, unsigned gop) {
+#include "../libs/types.h"
+#include "../libs/tools.h"
+#include "../libs/logging.h"
+#include "../libs/frame.h"
+#include "../libs/memsink.h"
+#include "../libs/unjpeg.h"
+
+#include "m2m.h"
+
+
+us_h264_stream_s *us_h264_stream_init(us_memsink_s *sink, const char *path, uint bitrate, uint gop) {
 	us_h264_stream_s *h264;
 	US_CALLOC(h264, 1);
 	h264->sink = sink;
@@ -42,18 +53,15 @@ void us_h264_stream_destroy(us_h264_stream_s *h264) {
 }
 
 void us_h264_stream_process(us_h264_stream_s *h264, const us_frame_s *frame, bool force_key) {
-	if (!us_memsink_server_check(h264->sink, frame)) {
-		return;
-	}
-
 	if (us_is_jpeg(frame->format)) {
-		const long double now = us_get_now_monotonic();
+		const ldf now_ts = us_get_now_monotonic();
 		US_LOG_DEBUG("H264: Input frame is JPEG; decoding ...");
 		if (us_unjpeg(frame, h264->tmp_src, true) < 0) {
+			atomic_store(&h264->online, false);
 			return;
 		}
 		frame = h264->tmp_src;
-		US_LOG_VERBOSE("H264: JPEG decoded; time=%.3Lf", us_get_now_monotonic() - now);
+		US_LOG_VERBOSE("H264: JPEG decoded; time=%.3Lf", us_get_now_monotonic() - now_ts);
 	}
 
 	if (h264->key_requested) {

src/ustreamer/h264.h

@@ -22,15 +22,12 @@
 
 #pragma once
 
-#include <stdbool.h>
 #include <stdatomic.h>
-#include <assert.h>
 
-#include "../libs/tools.h"
-#include "../libs/logging.h"
+#include "../libs/types.h"
 #include "../libs/frame.h"
 #include "../libs/memsink.h"
-#include "../libs/unjpeg.h"
+
 #include "m2m.h"
 
 
@@ -44,6 +41,6 @@ typedef struct {
 } us_h264_stream_s;
 
 
-us_h264_stream_s *us_h264_stream_init(us_memsink_s *sink, const char *path, unsigned bitrate, unsigned gop);
+us_h264_stream_s *us_h264_stream_init(us_memsink_s *sink, const char *path, uint bitrate, uint gop);
 void us_h264_stream_destroy(us_h264_stream_s *h264);
 void us_h264_stream_process(us_h264_stream_s *h264, const us_frame_s *frame, bool force_key);

src/ustreamer/http/bev.c

@@ -22,6 +22,14 @@
 
 #include "bev.h"
 
+#include <string.h>
+#include <errno.h>
+
+#include <event2/util.h>
+#include <event2/bufferevent.h>
+
+#include "../../libs/tools.h"
+
 
 char *us_bufferevent_format_reason(short what) {
 	char *reason;
@@ -34,6 +42,7 @@ char *us_bufferevent_format_reason(short what) {
 	strncat(reason, perror_str, 1023);
 	free(perror_str);
 	strcat(reason, " (");
+
 #	define FILL_REASON(x_bev, x_name) { \
 			if (what & x_bev) { \
 				if (first) { \
@@ -44,7 +53,6 @@ char *us_bufferevent_format_reason(short what) {
 				strcat(reason, x_name); \
 			} \
 		}
-
 	FILL_REASON(BEV_EVENT_READING, "reading");
 	FILL_REASON(BEV_EVENT_WRITING, "writing");
 	FILL_REASON(BEV_EVENT_ERROR, "error");

src/ustreamer/http/bev.h

@@ -22,14 +22,5 @@
 
 #pragma once
 
-#include <string.h>
-#include <errno.h>
-
-#include <event2/util.h>
-#include <event2/bufferevent.h>
-
-#include "../../libs/tools.h"
-#include "../../libs/logging.h"
-
 
 char *us_bufferevent_format_reason(short what);

src/ustreamer/http/mime.c

@@ -22,6 +22,13 @@
 
 #include "mime.h"
 
+#include <string.h>
+
+#include <event2/util.h>
+
+#include "../../libs/tools.h"
+#include "../../libs/array.h"
+
 
 static const struct {
 	const char *ext; // cppcheck-suppress unusedStructMember

src/ustreamer/http/mime.h

@@ -22,12 +22,5 @@
 
 #pragma once
 
-#include <string.h>
-
-#include <event2/util.h>
-
-#include "../../libs/tools.h"
-#include "../../libs/array.h"
-
 
 const char *us_guess_mime_type(const char *str);

src/ustreamer/http/path.c

@@ -22,6 +22,14 @@
 
 #include "path.h"
 
+#ifdef TEST_HTTP_PATH
+#	include <stdio.h>
+#	include <stdlib.h>
+#endif
+#include <string.h>
+
+#include "../../libs/tools.h"
+
 
 char *us_simplify_request_path(const char *str) {
 	// Based on Lighttpd sources:

src/ustreamer/http/path.h

@@ -22,13 +22,5 @@
 
 #pragma once
 
-#ifdef TEST_HTTP_PATH
-#	include <stdio.h>
-#	include <stdlib.h>
-#endif
-#include <string.h>
-
-#include "../../libs/tools.h"
-
 
 char *us_simplify_request_path(const char *str);

src/ustreamer/http/server.c

@@ -22,6 +22,61 @@
 
 #include "server.h"
 
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdatomic.h>
+#include <string.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <assert.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+
+#include <event2/util.h>
+#include <event2/event.h>
+#include <event2/thread.h>
+#include <event2/http.h>
+#include <event2/buffer.h>
+#include <event2/bufferevent.h>
+#include <event2/keyvalq_struct.h>
+
+#ifndef EVTHREAD_USE_PTHREADS_IMPLEMENTED
+#	error Required libevent-pthreads support
+#endif
+
+#include "../../libs/types.h"
+#include "../../libs/tools.h"
+#include "../../libs/threading.h"
+#include "../../libs/logging.h"
+#include "../../libs/process.h"
+#include "../../libs/frame.h"
+#include "../../libs/base64.h"
+#include "../../libs/list.h"
+#include "../data/index_html.h"
+#include "../data/favicon_ico.h"
+#include "../encoder.h"
+#include "../stream.h"
+#ifdef WITH_GPIO
+#	include "../gpio/gpio.h"
+#endif
+
+#include "bev.h"
+#include "unix.h"
+#include "uri.h"
+#include "mime.h"
+#include "static.h"
+#ifdef WITH_SYSTEMD
+#	include "systemd/systemd.h"
+#endif
+
 
 static int _http_preprocess_request(struct evhttp_request *request, us_server_s *server);
 
@@ -37,33 +92,38 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_ctx);
 static void _http_callback_stream_error(struct bufferevent *buf_event, short what, void *v_ctx);
 
-static void _http_request_watcher(int fd, short event, void *v_server);
 static void _http_refresher(int fd, short event, void *v_server);
-static void _http_queue_send_stream(us_server_s *server, bool stream_updated, bool frame_updated);
+static void _http_send_stream(us_server_s *server, bool stream_updated, bool frame_updated);
+static void _http_send_snapshot(us_server_s *server);
 
-static bool _expose_new_frame(us_server_s *server);
+static bool _expose_frame(us_server_s *server, const us_frame_s *frame);
 
 static const char *_http_get_header(struct evhttp_request *request, const char *key);
 static char *_http_get_client_hostport(struct evhttp_request *request);
 
 
+#define _S_LOG_ERROR(x_msg, ...)	US_LOG_ERROR("HTTP: " x_msg, ##__VA_ARGS__)
+#define _S_LOG_PERROR(x_msg, ...)	US_LOG_PERROR("HTTP: " x_msg, ##__VA_ARGS__)
+#define _S_LOG_INFO(x_msg, ...)		US_LOG_INFO("HTTP: " x_msg, ##__VA_ARGS__)
+#define _S_LOG_VERBOSE(x_msg, ...)	US_LOG_VERBOSE("HTTP: " x_msg, ##__VA_ARGS__)
+#define _S_LOG_DEBUG(x_msg, ...)	US_LOG_DEBUG("HTTP: " x_msg, ##__VA_ARGS__)
+
 #define _A_EVBUFFER_NEW(x_buf)						assert((x_buf = evbuffer_new()) != NULL)
 #define _A_EVBUFFER_ADD(x_buf, x_data, x_size)		assert(!evbuffer_add(x_buf, x_data, x_size))
 #define _A_EVBUFFER_ADD_PRINTF(x_buf, x_fmt, ...)	assert(evbuffer_add_printf(x_buf, x_fmt, ##__VA_ARGS__) >= 0)
 
-#define _VID(x_next)	server->run->stream->run->video->x_next
-#define _EX(x_next)		server->run->exposed->x_next
+#define _A_ADD_HEADER(x_request, x_key, x_value) \
+		assert(!evhttp_add_header(evhttp_request_get_output_headers(x_request), x_key, x_value))
 
 
 us_server_s *us_server_init(us_stream_s *stream) {
-	us_exposed_s *exposed;
+	us_server_exposed_s *exposed;
 	US_CALLOC(exposed, 1);
 	exposed->frame = us_frame_init();
 
 	us_server_runtime_s *run;
 	US_CALLOC(run, 1);
 	run->ext_fd = -1;
-	run->stream = stream;
 	run->exposed = exposed;
 
 	us_server_s *server;
@@ -77,6 +137,7 @@ us_server_s *us_server_init(us_stream_s *stream) {
 	server->allow_origin = "";
 	server->instance_id = "";
 	server->timeout = 10;
+	server->stream = stream;
 	server->run = run;
 
 	assert(!evthread_use_pthreads());
@@ -94,19 +155,18 @@ void us_server_destroy(us_server_s *server) {
 		event_free(run->refresher);
 	}
 
-	if (run->request_watcher != NULL) {
-		event_del(run->request_watcher);
-		event_free(run->request_watcher);
-	}
-
 	evhttp_free(run->http);
-	US_CLOSE_FD(run->ext_fd, close);
+	US_CLOSE_FD(run->ext_fd);
 	event_base_free(run->base);
 
 #	if LIBEVENT_VERSION_NUMBER >= 0x02010100
 	libevent_global_shutdown();
 #	endif
 
+	US_LIST_ITERATE(run->snapshot_clients, client, { // cppcheck-suppress constStatement
+		free(client);
+	});
+
 	US_LIST_ITERATE(run->stream_clients, client, { // cppcheck-suppress constStatement
 		free(client->key);
 		free(client->hostport);
@@ -123,32 +183,25 @@ void us_server_destroy(us_server_s *server) {
 
 int us_server_listen(us_server_s *server) {
 	us_server_runtime_s *const run = server->run;
-	us_stream_s *const stream = run->stream;
+	us_server_exposed_s *const ex = run->exposed;
+	us_stream_s *const stream = server->stream;
 
 	{
 		if (server->static_path[0] != '\0') {
-			US_LOG_INFO("Enabling HTTP file server: %s", server->static_path);
-			evhttp_set_gencb(run->http, _http_callback_static, (void *)server);
+			_S_LOG_INFO("Enabling the file server: %s", server->static_path);
+			evhttp_set_gencb(run->http, _http_callback_static, (void*)server);
 		} else {
-			assert(!evhttp_set_cb(run->http, "/", _http_callback_root, (void *)server));
-			assert(!evhttp_set_cb(run->http, "/favicon.ico", _http_callback_favicon, (void *)server));
+			assert(!evhttp_set_cb(run->http, "/", _http_callback_root, (void*)server));
+			assert(!evhttp_set_cb(run->http, "/favicon.ico", _http_callback_favicon, (void*)server));
 		}
-		assert(!evhttp_set_cb(run->http, "/state", _http_callback_state, (void *)server));
-		assert(!evhttp_set_cb(run->http, "/snapshot", _http_callback_snapshot, (void *)server));
-		assert(!evhttp_set_cb(run->http, "/stream", _http_callback_stream, (void *)server));
+		assert(!evhttp_set_cb(run->http, "/state", _http_callback_state, (void*)server));
+		assert(!evhttp_set_cb(run->http, "/snapshot", _http_callback_snapshot, (void*)server));
+		assert(!evhttp_set_cb(run->http, "/stream", _http_callback_stream, (void*)server));
 	}
 
-	us_frame_copy(stream->blank, _EX(frame));
-	_EX(notify_last_width) = _EX(frame->width);
-	_EX(notify_last_height) = _EX(frame->height);
-
-	if (server->exit_on_no_clients > 0) {
-		run->last_request_ts = us_get_now_monotonic();
-		struct timeval interval = {0};
-		interval.tv_usec = 100000;
-		assert((run->request_watcher = event_new(run->base, -1, EV_PERSIST, _http_request_watcher, server)) != NULL);
-		assert(!event_add(run->request_watcher, &interval));
-	}
+	us_frame_copy(stream->run->blank->jpeg, ex->frame);
+	ex->notify_last_width = ex->frame->width;
+	ex->notify_last_height = ex->frame->height;
 
 	{
 		struct timeval interval = {0};
@@ -168,17 +221,17 @@ int us_server_listen(us_server_s *server) {
 
 		char *raw_token;
 		US_ASPRINTF(raw_token, "%s:%s", server->user, server->passwd);
-		us_base64_encode((uint8_t *)raw_token, strlen(raw_token), &encoded_token, NULL);
+		us_base64_encode((u8*)raw_token, strlen(raw_token), &encoded_token, NULL);
 		free(raw_token);
 
 		US_ASPRINTF(run->auth_token, "Basic %s", encoded_token);
 		free(encoded_token);
 
-		US_LOG_INFO("Using HTTP basic auth");
+		_S_LOG_INFO("Using HTTP basic auth");
 	}
 
 	if (server->unix_path[0] != '\0') {
-		US_LOG_DEBUG("Binding HTTP to UNIX socket '%s' ...", server->unix_path);
+		_S_LOG_DEBUG("Binding server to UNIX socket '%s' ...", server->unix_path);
 		if ((run->ext_fd = us_evhttp_bind_unix(
 			run->http,
 			server->unix_path,
@@ -187,57 +240,55 @@ int us_server_listen(us_server_s *server) {
 		) {
 			return -1;
 		}
-		US_LOG_INFO("Listening HTTP on UNIX socket '%s'", server->unix_path);
+		_S_LOG_INFO("Listening HTTP on UNIX socket '%s'", server->unix_path);
 
 #	ifdef WITH_SYSTEMD
 	} else if (server->systemd) {
-		US_LOG_DEBUG("Binding HTTP to systemd socket ...");
+		_S_LOG_DEBUG("Binding HTTP to systemd socket ...");
 		if ((run->ext_fd = us_evhttp_bind_systemd(run->http)) < 0) {
 			return -1;
 		}
-		US_LOG_INFO("Listening systemd socket ...");
+		_S_LOG_INFO("Listening systemd socket ...");
 #	endif
 
 	} else {
-		US_LOG_DEBUG("Binding HTTP to [%s]:%u ...", server->host, server->port);
+		_S_LOG_DEBUG("Binding HTTP to [%s]:%u ...", server->host, server->port);
 		if (evhttp_bind_socket(run->http, server->host, server->port) < 0) {
-			US_LOG_PERROR("Can't bind HTTP on [%s]:%u", server->host, server->port)
+			_S_LOG_PERROR("Can't bind HTTP on [%s]:%u", server->host, server->port)
 			return -1;
 		}
-		US_LOG_INFO("Listening HTTP on [%s]:%u", server->host, server->port);
+		_S_LOG_INFO("Listening HTTP on [%s]:%u", server->host, server->port);
 	}
 
 	return 0;
 }
 
 void us_server_loop(us_server_s *server) {
-	US_LOG_INFO("Starting HTTP eventloop ...");
+	_S_LOG_INFO("Starting eventloop ...");
 	event_base_dispatch(server->run->base);
-	US_LOG_INFO("HTTP eventloop stopped");
+	_S_LOG_INFO("Eventloop stopped");
 }
 
 void us_server_loop_break(us_server_s *server) {
 	event_base_loopbreak(server->run->base);
 }
 
-#define ADD_HEADER(x_key, x_value) assert(!evhttp_add_header(evhttp_request_get_output_headers(request), x_key, x_value))
-
 static int _http_preprocess_request(struct evhttp_request *request, us_server_s *server) {
-	us_server_runtime_s *const run = server->run;
+	const us_server_runtime_s *const run = server->run;
 
-	run->last_request_ts = us_get_now_monotonic();
+	atomic_store(&server->stream->run->http_last_request_ts, us_get_now_monotonic());
 
 	if (server->allow_origin[0] != '\0') {
 		const char *const cors_headers = _http_get_header(request, "Access-Control-Request-Headers");
 		const char *const cors_method = _http_get_header(request, "Access-Control-Request-Method");
 
-		ADD_HEADER("Access-Control-Allow-Origin", server->allow_origin);
-		ADD_HEADER("Access-Control-Allow-Credentials", "true");
+		_A_ADD_HEADER(request, "Access-Control-Allow-Origin", server->allow_origin);
+		_A_ADD_HEADER(request, "Access-Control-Allow-Credentials", "true");
 		if (cors_headers != NULL) {
-			ADD_HEADER("Access-Control-Allow-Headers", cors_headers);
+			_A_ADD_HEADER(request, "Access-Control-Allow-Headers", cors_headers);
 		}
 		if (cors_method != NULL) {
-			ADD_HEADER("Access-Control-Allow-Methods", cors_method);
+			_A_ADD_HEADER(request, "Access-Control-Allow-Methods", cors_method);
 		}
 	}
 
@@ -248,9 +299,8 @@ static int _http_preprocess_request(struct evhttp_request *request, us_server_s
 
 	if (run->auth_token != NULL) {
 		const char *const token = _http_get_header(request, "Authorization");
-
 		if (token == NULL || strcmp(token, run->auth_token) != 0) {
-			ADD_HEADER("WWW-Authenticate", "Basic realm=\"Restricted area\"");
+			_A_ADD_HEADER(request, "WWW-Authenticate", "Basic realm=\"Restricted area\"");
 			evhttp_send_reply(request, 401, "Unauthorized", NULL);
 			return -1;
 		}
@@ -260,7 +310,6 @@ static int _http_preprocess_request(struct evhttp_request *request, us_server_s
 		evhttp_send_reply(request, HTTP_OK, "OK", NULL);
 		return -1;
 	}
-
 	return 0;
 }
 
@@ -298,7 +347,7 @@ static int _http_check_run_compat_action(struct evhttp_request *request, void *v
 	}
 
 static void _http_callback_root(struct evhttp_request *request, void *v_server) {
-	us_server_s *const server = (us_server_s *)v_server;
+	us_server_s *const server = v_server;
 
 	PREPROCESS_REQUEST;
 	COMPAT_REQUEST;
@@ -306,28 +355,28 @@ static void _http_callback_root(struct evhttp_request *request, void *v_server)
 	struct evbuffer *buf;
 	_A_EVBUFFER_NEW(buf);
 	_A_EVBUFFER_ADD_PRINTF(buf, "%s", US_HTML_INDEX_PAGE);
-	ADD_HEADER("Content-Type", "text/html");
+	_A_ADD_HEADER(request, "Content-Type", "text/html");
 	evhttp_send_reply(request, HTTP_OK, "OK", buf);
 
 	evbuffer_free(buf);
 }
 
 static void _http_callback_favicon(struct evhttp_request *request, void *v_server) {
-	us_server_s *const server = (us_server_s *)v_server;
+	us_server_s *const server = v_server;
 
 	PREPROCESS_REQUEST;
 
 	struct evbuffer *buf;
 	_A_EVBUFFER_NEW(buf);
-	_A_EVBUFFER_ADD(buf, (const void *)US_FAVICON_ICO_DATA, US_FAVICON_ICO_DATA_SIZE);
-	ADD_HEADER("Content-Type", "image/x-icon");
+	_A_EVBUFFER_ADD(buf, (const void*)US_FAVICON_ICO_DATA, US_FAVICON_ICO_DATA_SIZE);
+	_A_ADD_HEADER(request, "Content-Type", "image/x-icon");
 	evhttp_send_reply(request, HTTP_OK, "OK", buf);
 
 	evbuffer_free(buf);
 }
 
 static void _http_callback_static(struct evhttp_request *request, void *v_server) {
-	us_server_s *const server = (us_server_s *)v_server;
+	us_server_s *const server = v_server;
 
 	PREPROCESS_REQUEST;
 	COMPAT_REQUEST;
@@ -343,7 +392,7 @@ static void _http_callback_static(struct evhttp_request *request, void *v_server
 		if ((uri = evhttp_uri_parse(evhttp_request_get_uri(request))) == NULL) {
 			goto bad_request;
 		}
-		if ((uri_path = (char *)evhttp_uri_get_path(uri)) == NULL) {
+		if ((uri_path = (char*)evhttp_uri_get_path(uri)) == NULL) {
 			uri_path = "/";
 		}
 		if ((decoded_path = evhttp_uridecode(uri_path, 0, NULL)) == NULL) {
@@ -358,19 +407,18 @@ static void _http_callback_static(struct evhttp_request *request, void *v_server
 	}
 
 	if ((fd = open(static_path, O_RDONLY)) < 0) {
-		US_LOG_PERROR("HTTP: Can't open found static file %s", static_path);
+		_S_LOG_PERROR("Can't open found static file %s", static_path);
 		goto not_found;
 	}
 
 	{
 		struct stat st;
-
 		if (fstat(fd, &st) < 0) {
-			US_LOG_PERROR("HTTP: Can't stat() found static file %s", static_path);
+			_S_LOG_PERROR("Can't stat() found static file %s", static_path);
 			goto not_found;
 		}
 		if (st.st_size > 0 && evbuffer_add_file(buf, fd, 0, st.st_size) < 0) {
-			US_LOG_ERROR("HTTP: Can't serve static file %s", static_path);
+			_S_LOG_ERROR("Can't serve static file %s", static_path);
 			goto not_found;
 		}
 
@@ -378,7 +426,7 @@ static void _http_callback_static(struct evhttp_request *request, void *v_server
 		// and will close it when finished transferring data
 		fd = -1;
 
-		ADD_HEADER("Content-Type", us_guess_mime_type(static_path));
+		_A_ADD_HEADER(request, "Content-Type", us_guess_mime_type(static_path));
 		evhttp_send_reply(request, HTTP_OK, "OK", buf);
 		goto cleanup;
 	}
@@ -392,7 +440,7 @@ not_found:
 	goto cleanup;
 
 cleanup:
-	US_CLOSE_FD(fd, close); // cppcheck-suppress unreadVariable
+	US_CLOSE_FD(fd); // cppcheck-suppress unreadVariable
 	US_DELETE(static_path, free);
 	US_DELETE(buf, evbuffer_free);
 	US_DELETE(decoded_path, free);
@@ -402,14 +450,15 @@ cleanup:
 #undef COMPAT_REQUEST
 
 static void _http_callback_state(struct evhttp_request *request, void *v_server) {
-	us_server_s *const server = (us_server_s *)v_server;
+	us_server_s *const server = v_server;
 	us_server_runtime_s *const run = server->run;
-	us_stream_s *const stream = run->stream;
+	us_server_exposed_s *const ex = run->exposed;
+	us_stream_s *const stream = server->stream;
 
 	PREPROCESS_REQUEST;
 
 	us_encoder_type_e enc_type;
-	unsigned enc_quality;
+	uint enc_quality;
 	us_encoder_get_runtime_params(stream->enc, &enc_type, &enc_quality);
 
 	struct evbuffer *buf;
@@ -433,34 +482,39 @@ static void _http_callback_state(struct evhttp_request *request, void *v_server)
 		);
 	}
 
-	if (stream->sink != NULL || stream->h264_sink != NULL) {
+	if (stream->jpeg_sink != NULL || stream->h264_sink != NULL) {
 		_A_EVBUFFER_ADD_PRINTF(buf, " \"sinks\": {");
-		if (stream->sink != NULL) {
+		if (stream->jpeg_sink != NULL) {
 			_A_EVBUFFER_ADD_PRINTF(buf,
 				"\"jpeg\": {\"has_clients\": %s}",
-				us_bool_to_string(atomic_load(&stream->sink->has_clients))
+				us_bool_to_string(atomic_load(&stream->jpeg_sink->has_clients))
 			);
 		}
 		if (stream->h264_sink != NULL) {
 			_A_EVBUFFER_ADD_PRINTF(buf,
 				"%s\"h264\": {\"has_clients\": %s}",
-				(stream->sink ? ", " : ""),
+				(stream->jpeg_sink ? ", " : ""),
 				us_bool_to_string(atomic_load(&stream->h264_sink->has_clients))
 			);
 		}
 		_A_EVBUFFER_ADD_PRINTF(buf, "},");
 	}
 
+	uint width;
+	uint height;
+	bool online;
+	uint captured_fps;
+	us_stream_get_capture_state(stream, &width, &height, &online, &captured_fps);
 	_A_EVBUFFER_ADD_PRINTF(buf,
 		" \"source\": {\"resolution\": {\"width\": %u, \"height\": %u},"
 		" \"online\": %s, \"desired_fps\": %u, \"captured_fps\": %u},"
 		" \"stream\": {\"queued_fps\": %u, \"clients\": %u, \"clients_stat\": {",
-		(server->fake_width ? server->fake_width : _EX(frame->width)),
-		(server->fake_height ? server->fake_height : _EX(frame->height)),
-		us_bool_to_string(_EX(frame->online)),
+		(server->fake_width ? server->fake_width : width),
+		(server->fake_height ? server->fake_height : height),
+		us_bool_to_string(online),
 		stream->dev->desired_fps,
-		_EX(captured_fps),
-		_EX(queued_fps),
+		captured_fps,
+		ex->queued_fps,
 		run->stream_clients_count
 	);
 
@@ -481,61 +535,26 @@ static void _http_callback_state(struct evhttp_request *request, void *v_server)
 
 	_A_EVBUFFER_ADD_PRINTF(buf, "}}}}");
 
-	ADD_HEADER("Content-Type", "application/json");
+	_A_ADD_HEADER(request, "Content-Type", "application/json");
 	evhttp_send_reply(request, HTTP_OK, "OK", buf);
 	evbuffer_free(buf);
 }
 
 static void _http_callback_snapshot(struct evhttp_request *request, void *v_server) {
-	us_server_s *const server = (us_server_s *)v_server;
+	us_server_s *const server = v_server;
 
 	PREPROCESS_REQUEST;
 
-	struct evbuffer *buf;
-	_A_EVBUFFER_NEW(buf);
-	_A_EVBUFFER_ADD(buf, (const void *)_EX(frame->data), _EX(frame->used));
+	us_snapshot_client_s *client;
+	US_CALLOC(client, 1);
+	client->server = server;
+	client->request = request;
+	client->request_ts = us_get_now_monotonic();
 
-	ADD_HEADER("Cache-Control", "no-store, no-cache, must-revalidate, proxy-revalidate, pre-check=0, post-check=0, max-age=0");
-	ADD_HEADER("Pragma", "no-cache");
-	ADD_HEADER("Expires", "Mon, 3 Jan 2000 12:34:56 GMT");
-
-	char header_buf[256];
-
-#	define ADD_TIME_HEADER(x_key, x_value) { \
-			US_SNPRINTF(header_buf, 255, "%.06Lf", x_value); \
-			ADD_HEADER(x_key, header_buf); \
-		}
-
-#	define ADD_UNSIGNED_HEADER(x_key, x_value) { \
-			US_SNPRINTF(header_buf, 255, "%u", x_value); \
-			ADD_HEADER(x_key, header_buf); \
-		}
-
-	ADD_TIME_HEADER("X-Timestamp", us_get_now_real());
-
-	ADD_HEADER("X-UStreamer-Online",						us_bool_to_string(_EX(frame->online)));
-	ADD_UNSIGNED_HEADER("X-UStreamer-Dropped",				_EX(dropped));
-	ADD_UNSIGNED_HEADER("X-UStreamer-Width",				_EX(frame->width));
-	ADD_UNSIGNED_HEADER("X-UStreamer-Height",				_EX(frame->height));
-	ADD_TIME_HEADER("X-UStreamer-Grab-Timestamp",			_EX(frame->grab_ts));
-	ADD_TIME_HEADER("X-UStreamer-Encode-Begin-Timestamp",	_EX(frame->encode_begin_ts));
-	ADD_TIME_HEADER("X-UStreamer-Encode-End-Timestamp",		_EX(frame->encode_end_ts));
-	ADD_TIME_HEADER("X-UStreamer-Expose-Begin-Timestamp",	_EX(expose_begin_ts));
-	ADD_TIME_HEADER("X-UStreamer-Expose-Cmp-Timestamp",		_EX(expose_cmp_ts));
-	ADD_TIME_HEADER("X-UStreamer-Expose-End-Timestamp",		_EX(expose_end_ts));
-	ADD_TIME_HEADER("X-UStreamer-Send-Timestamp",			us_get_now_monotonic());
-
-#	undef ADD_UNSUGNED_HEADER
-#	undef ADD_TIME_HEADER
-
-	ADD_HEADER("Content-Type", "image/jpeg");
-
-	evhttp_send_reply(request, HTTP_OK, "OK", buf);
-	evbuffer_free(buf);
+	atomic_fetch_add(&server->stream->run->http_snapshot_requested, 1);
+	US_LIST_APPEND(server->run->snapshot_clients, client);
 }
 
-#undef ADD_HEADER
-
 static void _http_callback_stream(struct evhttp_request *request, void *v_server) {
 	// https://github.com/libevent/libevent/blob/29cc8386a2f7911eaa9336692a2c5544d8b4734f/http.c#L2814
 	// https://github.com/libevent/libevent/blob/29cc8386a2f7911eaa9336692a2c5544d8b4734f/http.c#L2789
@@ -543,7 +562,7 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 	// https://github.com/libevent/libevent/blob/29cc8386a2f7911eaa9336692a2c5544d8b4734f/http.c#L791
 	// https://github.com/libevent/libevent/blob/29cc8386a2f7911eaa9336692a2c5544d8b4734f/http.c#L1458
 
-	us_server_s *const server = (us_server_s *)v_server;
+	us_server_s *const server = v_server;
 	us_server_runtime_s *const run = server->run;
 
 	PREPROCESS_REQUEST;
@@ -574,26 +593,26 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 		US_LIST_APPEND_C(run->stream_clients, client, run->stream_clients_count);
 
 		if (run->stream_clients_count == 1) {
-			atomic_store(&_VID(has_clients), true);
+			atomic_store(&server->stream->run->http_has_clients, true);
 #			ifdef WITH_GPIO
 			us_gpio_set_has_http_clients(true);
 #			endif
 		}
 
-		US_LOG_INFO("HTTP: NEW client (now=%u): %s, id=%" PRIx64,
+		_S_LOG_INFO("NEW client (now=%u): %s, id=%" PRIx64,
 			run->stream_clients_count, client->hostport, client->id);
 
 		struct bufferevent *const buf_event = evhttp_connection_get_bufferevent(conn);
 		if (server->tcp_nodelay && run->ext_fd >= 0) {
-			US_LOG_DEBUG("HTTP: Setting up TCP_NODELAY to the client %s ...", client->hostport);
+			_S_LOG_DEBUG("Setting up TCP_NODELAY to the client %s ...", client->hostport);
 			const evutil_socket_t fd = bufferevent_getfd(buf_event);
 			assert(fd >= 0);
 			int on = 1;
-			if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (void *)&on, sizeof(on)) != 0) {
-				US_LOG_PERROR("HTTP: Can't set TCP_NODELAY to the client %s", client->hostport);
+			if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (void*)&on, sizeof(on)) != 0) {
+				_S_LOG_PERROR("Can't set TCP_NODELAY to the client %s", client->hostport);
 			}
 		}
-		bufferevent_setcb(buf_event, NULL, NULL, _http_callback_stream_error, (void *)client);
+		bufferevent_setcb(buf_event, NULL, NULL, _http_callback_stream_error, (void*)client);
 		bufferevent_enable(buf_event, EV_READ);
 	} else {
 		evhttp_request_free(request);
@@ -603,16 +622,17 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 #undef PREPROCESS_REQUEST
 
 static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_client) {
-	us_stream_client_s *const client = (us_stream_client_s *)v_client;
+	us_stream_client_s *const client = v_client;
 	us_server_s *const server = client->server;
+	us_server_exposed_s *const ex = server->run->exposed;
 
-	const long double now = us_get_now_monotonic();
-	const long long now_second = us_floor_ms(now);
+	const ldf now_ts = us_get_now_monotonic();
+	const sll now_sec_ts = us_floor_ms(now_ts);
 
-	if (now_second != client->fps_accum_second) {
+	if (now_sec_ts != client->fps_ts) {
 		client->fps = client->fps_accum;
 		client->fps_accum = 0;
-		client->fps_accum_second = now_second;
+		client->fps_ts = now_sec_ts;
 	}
 	client->fps_accum += 1;
 
@@ -692,7 +712,7 @@ static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_c
 			"Content-Length: %zu" RN
 			"X-Timestamp: %.06Lf" RN
 			"%s",
-			(!client->zero_data ? _EX(frame->used) : 0),
+			(!client->zero_data ? ex->frame->used : 0),
 			us_get_now_real(),
 			(client->extra_headers ? "" : RN)
 		);
@@ -712,25 +732,25 @@ static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_c
 				"X-UStreamer-Send-Time: %.06Lf" RN
 				"X-UStreamer-Latency: %.06Lf" RN
 				RN,
-				us_bool_to_string(_EX(frame->online)),
-				_EX(dropped),
-				_EX(frame->width),
-				_EX(frame->height),
+				us_bool_to_string(ex->frame->online),
+				ex->dropped,
+				ex->frame->width,
+				ex->frame->height,
 				client->fps,
-				_EX(frame->grab_ts),
-				_EX(frame->encode_begin_ts),
-				_EX(frame->encode_end_ts),
-				_EX(expose_begin_ts),
-				_EX(expose_cmp_ts),
-				_EX(expose_end_ts),
-				now,
-				now - _EX(frame->grab_ts)
+				ex->frame->grab_ts,
+				ex->frame->encode_begin_ts,
+				ex->frame->encode_end_ts,
+				ex->expose_begin_ts,
+				ex->expose_cmp_ts,
+				ex->expose_end_ts,
+				now_ts,
+				now_ts - ex->frame->grab_ts
 			);
 		}
 	}
 
 	if (!client->zero_data) {
-		_A_EVBUFFER_ADD(buf, (void *)_EX(frame->data), _EX(frame->used));
+		_A_EVBUFFER_ADD(buf, (void*)ex->frame->data, ex->frame->used);
 	}
 	_A_EVBUFFER_ADD_PRINTF(buf, RN "--" BOUNDARY RN);
 
@@ -741,7 +761,7 @@ static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_c
 	assert(!bufferevent_write_buffer(buf_event, buf));
 	evbuffer_free(buf);
 
-	bufferevent_setcb(buf_event, NULL, NULL, _http_callback_stream_error, (void *)client);
+	bufferevent_setcb(buf_event, NULL, NULL, _http_callback_stream_error, (void*)client);
 	bufferevent_enable(buf_event, EV_READ);
 
 #	undef ADD_ADVANCE_HEADERS
@@ -752,21 +772,21 @@ static void _http_callback_stream_error(struct bufferevent *buf_event, short wha
 	(void)buf_event;
 	(void)what;
 
-	us_stream_client_s *const client = (us_stream_client_s *)v_client;
+	us_stream_client_s *const client = v_client;
 	us_server_s *const server = client->server;
 	us_server_runtime_s *const run = server->run;
 
 	US_LIST_REMOVE_C(run->stream_clients, client, run->stream_clients_count);
 
 	if (run->stream_clients_count == 0) {
-		atomic_store(&_VID(has_clients), false);
+		atomic_store(&server->stream->run->http_has_clients, false);
 #		ifdef WITH_GPIO
 		us_gpio_set_has_http_clients(false);
 #		endif
 	}
 
 	char *const reason = us_bufferevent_format_reason(what);
-	US_LOG_INFO("HTTP: DEL client (now=%u): %s, id=%" PRIx64 ", %s",
+	_S_LOG_INFO("DEL client (now=%u): %s, id=%" PRIx64 ", %s",
 		run->stream_clients_count, client->hostport, client->id, reason);
 	free(reason);
 
@@ -778,8 +798,9 @@ static void _http_callback_stream_error(struct bufferevent *buf_event, short wha
 	free(client);
 }
 
-static void _http_queue_send_stream(us_server_s *server, bool stream_updated, bool frame_updated) {
+static void _http_send_stream(us_server_s *server, bool stream_updated, bool frame_updated) {
 	us_server_runtime_s *const run = server->run;
+	us_server_exposed_s *const ex = run->exposed;
 
 	bool has_clients = false;
 	bool queued = false;
@@ -803,7 +824,7 @@ static void _http_queue_send_stream(us_server_s *server, bool stream_updated, bo
 
 			if (dual_update || frame_updated || client->need_first_frame) {
 				struct bufferevent *const buf_event = evhttp_connection_get_bufferevent(conn);
-				bufferevent_setcb(buf_event, NULL, _http_callback_stream_write, _http_callback_stream_error, (void *)client);
+				bufferevent_setcb(buf_event, NULL, _http_callback_stream_write, _http_callback_stream_error, (void*)client);
 				bufferevent_enable(buf_event, EV_READ|EV_WRITE);
 
 				client->need_first_frame = false;
@@ -818,121 +839,177 @@ static void _http_queue_send_stream(us_server_s *server, bool stream_updated, bo
 	});
 
 	if (queued) {
-		static unsigned queued_fps_accum = 0;
-		static long long queued_fps_second = 0;
-		const long long now = us_floor_ms(us_get_now_monotonic());
-		if (now != queued_fps_second) {
-			_EX(queued_fps) = queued_fps_accum;
+		static uint queued_fps_accum = 0;
+		static sll queued_fps_ts = 0;
+		const sll now_sec_ts = us_floor_ms(us_get_now_monotonic());
+		if (now_sec_ts != queued_fps_ts) {
+			ex->queued_fps = queued_fps_accum;
 			queued_fps_accum = 0;
-			queued_fps_second = now;
+			queued_fps_ts = now_sec_ts;
 		}
 		queued_fps_accum += 1;
 	} else if (!has_clients) {
-		_EX(queued_fps) = 0;
+		ex->queued_fps = 0;
 	}
 }
 
-static void _http_request_watcher(int fd, short what, void *v_server) {
-	(void)fd;
-	(void)what;
+static void _http_send_snapshot(us_server_s *server) {
+	us_server_exposed_s *const ex = server->run->exposed;
+	us_blank_s *blank = NULL;
 
-	us_server_s *const server = (us_server_s *)v_server;
-	us_server_runtime_s *const run = server->run;
-	const long double now = us_get_now_monotonic();
+#	define ADD_TIME_HEADER(x_key, x_value) { \
+			US_SNPRINTF(header_buf, 255, "%.06Lf", x_value); \
+			_A_ADD_HEADER(request, x_key, header_buf); \
+		}
 
-	if (us_stream_has_clients(run->stream)) {
-		run->last_request_ts = now;
-	} else if (run->last_request_ts + server->exit_on_no_clients < now) {
-		US_LOG_INFO("HTTP: No requests or HTTP/sink clients found in last %u seconds, exiting ...",
-			server->exit_on_no_clients);
-		us_process_suicide();
-		run->last_request_ts = now;
-	}
+#	define ADD_UNSIGNED_HEADER(x_key, x_value) { \
+			US_SNPRINTF(header_buf, 255, "%u", x_value); \
+			_A_ADD_HEADER(request, x_key, header_buf); \
+		}
+	uint width;
+	uint height;
+	uint captured_fps; // Unused
+	bool online;
+	us_stream_get_capture_state(server->stream, &width, &height, &online, &captured_fps);
+
+	US_LIST_ITERATE(server->run->snapshot_clients, client, { // cppcheck-suppress constStatement
+		struct evhttp_request *request = client->request;
+
+		const bool has_fresh_snapshot = (atomic_load(&server->stream->run->http_snapshot_requested) == 0);
+		const bool timed_out = (client->request_ts + US_MAX((uint)1, server->stream->error_delay * 3) < us_get_now_monotonic());
+
+		if (has_fresh_snapshot || timed_out) {
+			us_frame_s *frame = ex->frame;
+			if (!online) {
+				if (blank == NULL) {
+					blank = us_blank_init();
+					us_blank_draw(blank, "< NO SIGNAL >", width, height);
+				}
+				frame = blank->jpeg;
+			}
+
+			struct evbuffer *buf;
+			_A_EVBUFFER_NEW(buf);
+			_A_EVBUFFER_ADD(buf, (const void*)frame->data, frame->used);
+
+			_A_ADD_HEADER(request, "Cache-Control", "no-store, no-cache, must-revalidate, proxy-revalidate, pre-check=0, post-check=0, max-age=0");
+			_A_ADD_HEADER(request, "Pragma", "no-cache");
+			_A_ADD_HEADER(request, "Expires", "Mon, 3 Jan 2000 12:34:56 GMT");
+
+			char header_buf[256];
+
+			ADD_TIME_HEADER("X-Timestamp", us_get_now_real());
+
+			_A_ADD_HEADER(request, "X-UStreamer-Online",			us_bool_to_string(frame->online));
+			ADD_UNSIGNED_HEADER("X-UStreamer-Width",				frame->width);
+			ADD_UNSIGNED_HEADER("X-UStreamer-Height",				frame->height);
+			ADD_TIME_HEADER("X-UStreamer-Grab-Timestamp",			frame->grab_ts);
+			ADD_TIME_HEADER("X-UStreamer-Encode-Begin-Timestamp",	frame->encode_begin_ts);
+			ADD_TIME_HEADER("X-UStreamer-Encode-End-Timestamp",		frame->encode_end_ts);
+			ADD_TIME_HEADER("X-UStreamer-Send-Timestamp",			us_get_now_monotonic());
+
+			_A_ADD_HEADER(request, "Content-Type", "image/jpeg");
+
+			evhttp_send_reply(request, HTTP_OK, "OK", buf);
+			evbuffer_free(buf);
+
+			US_LIST_REMOVE(server->run->snapshot_clients, client);
+			free(client);
+		}
+	});
+
+#	undef ADD_UNSUGNED_HEADER
+#	undef ADD_TIME_HEADER
+
+	US_DELETE(blank, us_blank_destroy);
 }
 
 static void _http_refresher(int fd, short what, void *v_server) {
 	(void)fd;
 	(void)what;
 
-	us_server_s *server = (us_server_s *)v_server;
+	us_server_s *server = v_server;
+	us_server_exposed_s *ex = server->run->exposed;
+	us_ring_s *const ring = server->stream->run->http_jpeg_ring;
+
 	bool stream_updated = false;
 	bool frame_updated = false;
 
-	if (atomic_load(&_VID(updated))) {
-		frame_updated = _expose_new_frame(server);
+	const int ri = us_ring_consumer_acquire(ring, 0);
+	if (ri >= 0) {
+		const us_frame_s *const frame = ring->items[ri];
+		frame_updated = _expose_frame(server, frame);
 		stream_updated = true;
-	} else if (_EX(expose_end_ts) + 1 < us_get_now_monotonic()) {
-		US_LOG_DEBUG("HTTP: Repeating exposed ...");
-		_EX(expose_begin_ts) = us_get_now_monotonic();
-		_EX(expose_cmp_ts) = _EX(expose_begin_ts);
-		_EX(expose_end_ts) = _EX(expose_begin_ts);
+		us_ring_consumer_release(ring, ri);
+	} else if (ex->expose_end_ts + 1 < us_get_now_monotonic()) {
+		_S_LOG_DEBUG("Repeating exposed ...");
+		ex->expose_begin_ts = us_get_now_monotonic();
+		ex->expose_cmp_ts = ex->expose_begin_ts;
+		ex->expose_end_ts = ex->expose_begin_ts;
 		frame_updated = true;
 		stream_updated = true;
 	}
 
-	_http_queue_send_stream(server, stream_updated, frame_updated);
+	_http_send_stream(server, stream_updated, frame_updated);
+	_http_send_snapshot(server);
 
 	if (
 		frame_updated
 		&& server->notify_parent
 		&& (
-			_EX(notify_last_online) != _EX(frame->online)
-			|| _EX(notify_last_width) != _EX(frame->width)
-			|| _EX(notify_last_height) != _EX(frame->height)
+			ex->notify_last_online != ex->frame->online
+			|| ex->notify_last_width != ex->frame->width
+			|| ex->notify_last_height != ex->frame->height
 		)
 	) {
-		_EX(notify_last_online) = _EX(frame->online);
-		_EX(notify_last_width) = _EX(frame->width);
-		_EX(notify_last_height) = _EX(frame->height);
+		ex->notify_last_online = ex->frame->online;
+		ex->notify_last_width = ex->frame->width;
+		ex->notify_last_height = ex->frame->height;
 		us_process_notify_parent();
 	}
 }
 
-static bool _expose_new_frame(us_server_s *server) {
-	bool updated = false;
+static bool _expose_frame(us_server_s *server, const us_frame_s *frame) {
+	us_server_exposed_s *const ex = server->run->exposed;
 
-	US_MUTEX_LOCK(_VID(mutex));
+	_S_LOG_DEBUG("Updating exposed frame (online=%d) ...", frame->online);
+	ex->expose_begin_ts = us_get_now_monotonic();
 
-	US_LOG_DEBUG("HTTP: Updating exposed frame (online=%d) ...", _VID(frame->online));
-
-	_EX(captured_fps) = _VID(captured_fps);
-	_EX(expose_begin_ts) = us_get_now_monotonic();
-
-	if (server->drop_same_frames && _VID(frame->online)) {
+	if (server->drop_same_frames && frame->online) {
 		bool need_drop = false;
 		bool maybe_same = false;
 		if (
-			(need_drop = (_EX(dropped) < server->drop_same_frames))
-			&& (maybe_same = us_frame_compare(_EX(frame), _VID(frame)))
+			(need_drop = (ex->dropped < server->drop_same_frames))
+			&& (maybe_same = us_frame_compare(ex->frame, frame))
 		) {
-			_EX(expose_cmp_ts) = us_get_now_monotonic();
-			_EX(expose_end_ts) = _EX(expose_cmp_ts);
-			US_LOG_VERBOSE("HTTP: Dropped same frame number %u; cmp_time=%.06Lf",
-				_EX(dropped), _EX(expose_cmp_ts) - _EX(expose_begin_ts));
-			_EX(dropped) += 1;
-			goto not_updated;
+			ex->expose_cmp_ts = us_get_now_monotonic();
+			ex->expose_end_ts = ex->expose_cmp_ts;
+			_S_LOG_VERBOSE("Dropped same frame number %u; cmp_time=%.06Lf",
+				ex->dropped, (ex->expose_cmp_ts - ex->expose_begin_ts));
+			ex->dropped += 1;
+			return false; // Not updated
 		} else {
-			_EX(expose_cmp_ts) = us_get_now_monotonic();
-			US_LOG_VERBOSE("HTTP: Passed same frame check (need_drop=%d, maybe_same=%d); cmp_time=%.06Lf",
-				need_drop, maybe_same, (_EX(expose_cmp_ts) - _EX(expose_begin_ts)));
+			ex->expose_cmp_ts = us_get_now_monotonic();
+			_S_LOG_VERBOSE("Passed same frame check (need_drop=%d, maybe_same=%d); cmp_time=%.06Lf",
+				need_drop, maybe_same, (ex->expose_cmp_ts - ex->expose_begin_ts));
 		}
 	}
 
-	us_frame_copy(_VID(frame), _EX(frame));
+	if (frame->used == 0) {
+		// Фрейм нулевой длины означает, что мы просто должны повторить то,
+		// что у нас уже есть, с поправкой на онлайн.
+		ex->frame->online = frame->online;
+	} else {
+		us_frame_copy(frame, ex->frame);
+	}
 
-	_EX(dropped) = 0;
-	_EX(expose_cmp_ts) = _EX(expose_begin_ts);
-	_EX(expose_end_ts) = us_get_now_monotonic();
+	ex->dropped = 0;
+	ex->expose_cmp_ts = ex->expose_begin_ts;
+	ex->expose_end_ts = us_get_now_monotonic();
 
-	US_LOG_VERBOSE("HTTP: Exposed frame: online=%d, exp_time=%.06Lf",
-		 _EX(frame->online), _EX(expose_end_ts) - _EX(expose_begin_ts));
-
-	updated = true;
-
-not_updated:
-	atomic_store(&_VID(updated), false);
-	US_MUTEX_UNLOCK(_VID(mutex));
-	return updated;
+	_S_LOG_VERBOSE("Exposed frame: online=%d, exp_time=%.06Lf",
+		 ex->frame->online, (ex->expose_end_ts - ex->expose_begin_ts));
+	return true; // Updated
 }
 
 static const char *_http_get_header(struct evhttp_request *request, const char *key) {
@@ -953,7 +1030,7 @@ static char *_http_get_client_hostport(struct evhttp_request *request) {
 	if (xff != NULL) {
 		US_DELETE(addr, free);
 		assert((addr = strndup(xff, 1024)) != NULL);
-		for (unsigned index = 0; addr[index]; ++index) {
+		for (uint index = 0; addr[index]; ++index) {
 			if (addr[index] == ',') {
 				addr[index] = '\0';
 				break;

src/ustreamer/http/server.h

@@ -22,96 +22,62 @@
 
 #pragma once
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <stdatomic.h>
-#include <string.h>
-#include <inttypes.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <assert.h>
-
-#include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/time.h>
-#include <netinet/tcp.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
 
 #include <event2/util.h>
 #include <event2/event.h>
-#include <event2/thread.h>
 #include <event2/http.h>
-#include <event2/buffer.h>
-#include <event2/bufferevent.h>
-#include <event2/keyvalq_struct.h>
 
-#ifndef EVTHREAD_USE_PTHREADS_IMPLEMENTED
-#	error Required libevent-pthreads support
-#endif
-
-#include "../../libs/tools.h"
-#include "../../libs/threading.h"
-#include "../../libs/logging.h"
-#include "../../libs/process.h"
+#include "../../libs/types.h"
 #include "../../libs/frame.h"
-#include "../../libs/base64.h"
 #include "../../libs/list.h"
-#include "../data/index_html.h"
-#include "../data/favicon_ico.h"
 #include "../encoder.h"
 #include "../stream.h"
-#ifdef WITH_GPIO
-#	include "../gpio/gpio.h"
-#endif
-
-#include "bev.h"
-#include "unix.h"
-#include "uri.h"
-#include "mime.h"
-#include "static.h"
-#ifdef WITH_SYSTEMD
-#	include "systemd/systemd.h"
-#endif
 
 
 typedef struct us_stream_client_sx {
 	struct us_server_sx		*server;
 	struct evhttp_request	*request;
 
-	char		*key;
-	bool		extra_headers;
-	bool		advance_headers;
-	bool		dual_final_frames;
-	bool		zero_data;
+	char	*key;
+	bool	extra_headers;
+	bool	advance_headers;
+	bool	dual_final_frames;
+	bool	zero_data;
 
-	char		*hostport;
-	uint64_t	id;
-	bool		need_initial;
-	bool		need_first_frame;
-	bool		updated_prev;
-	unsigned	fps;
-	unsigned	fps_accum;
-	long long	fps_accum_second;
+	char	*hostport;
+	u64		id;
+	bool	need_initial;
+	bool	need_first_frame;
+	bool	updated_prev;
+	uint	fps_accum;
+	sll		fps_ts;
+	uint	fps;
 
 	US_LIST_STRUCT(struct us_stream_client_sx);
 } us_stream_client_s;
 
-typedef struct {
-	us_frame_s		*frame;
-	unsigned		captured_fps;
-	unsigned		queued_fps;
-	unsigned		dropped;
-	long double		expose_begin_ts;
-	long double		expose_cmp_ts;
-	long double		expose_end_ts;
+typedef struct us_snapshot_client_sx {
+	struct us_server_sx		*server;
+	struct evhttp_request	*request;
+	ldf						request_ts;
 
-	bool			notify_last_online;
-	unsigned		notify_last_width;
-	unsigned		notify_last_height;
-} us_exposed_s;
+	US_LIST_STRUCT(struct us_snapshot_client_sx);
+} us_snapshot_client_s;
+
+typedef struct {
+	us_frame_s	*frame;
+	uint		captured_fps;
+	uint		queued_fps;
+	uint		dropped;
+	ldf			expose_begin_ts;
+	ldf			expose_cmp_ts;
+	ldf			expose_end_ts;
+
+	bool		notify_last_online;
+	uint		notify_last_width;
+	uint		notify_last_height;
+} us_server_exposed_s;
 
 typedef struct {
 	struct event_base	*base;
@@ -120,44 +86,43 @@ typedef struct {
 
 	char				*auth_token;
 
-	struct event		*request_watcher;
-	long double			last_request_ts;
-
 	struct event		*refresher;
-	us_stream_s			*stream;
-	us_exposed_s		*exposed;
+	us_server_exposed_s	*exposed;
 
 	us_stream_client_s	*stream_clients;
-	unsigned			stream_clients_count;
+	uint				stream_clients_count;
+
+	us_snapshot_client_s *snapshot_clients;
 } us_server_runtime_s;
 
 typedef struct us_server_sx {
-	char		*host;
-	unsigned	port;
+	us_stream_s	*stream;
 
-	char		*unix_path;
-	bool		unix_rm;
-	mode_t		unix_mode;
+	char	*host;
+	uint	port;
+
+	char	*unix_path;
+	bool	unix_rm;
+	mode_t	unix_mode;
 
 #	ifdef WITH_SYSTEMD
-	bool		systemd;
+	bool	systemd;
 #	endif
 
-	bool		tcp_nodelay;
-	unsigned	timeout;
+	bool	tcp_nodelay;
+	uint	timeout;
 
-	char		*user;
-	char		*passwd;
-	char		*static_path;
-	char		*allow_origin;
-	char		*instance_id;
+	char	*user;
+	char	*passwd;
+	char	*static_path;
+	char	*allow_origin;
+	char	*instance_id;
 
-	unsigned	drop_same_frames;
-	unsigned	fake_width;
-	unsigned	fake_height;
+	uint	drop_same_frames;
+	uint	fake_width;
+	uint	fake_height;
 
-	bool		notify_parent;
-	unsigned	exit_on_no_clients;
+	bool	notify_parent;
 
 	us_server_runtime_s *run;
 } us_server_s;

src/ustreamer/http/static.c

@@ -22,6 +22,19 @@
 
 #include "static.h"
 
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <sys/stat.h>
+
+#include "../../libs/tools.h"
+#include "../../libs/logging.h"
+
+#include "path.h"
+
 
 char *us_find_static_file_path(const char *root_path, const char *request_path) {
 	char *path = NULL;

src/ustreamer/http/static.h

@@ -22,18 +22,5 @@
 
 #pragma once
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <assert.h>
-
-#include <sys/stat.h>
-
-#include "../../libs/tools.h"
-#include "../../libs/logging.h"
-
-#include "path.h"
-
 
 char *us_find_static_file_path(const char *root_path, const char *request_path);

src/ustreamer/http/systemd/systemd.c

@@ -22,11 +22,22 @@
 
 #include "systemd.h"
 
+#include <unistd.h>
+#include <assert.h>
+
+#include <event2/http.h>
+#include <event2/util.h>
+
+#include <systemd/sd-daemon.h>
+
+#include "../../../libs/tools.h"
+#include "../../../libs/logging.h"
+
 
 evutil_socket_t us_evhttp_bind_systemd(struct evhttp *http) {
 	const int fds = sd_listen_fds(1);
 	if (fds < 1) {
-		US_LOG_ERROR("No available systemd sockets");
+		US_LOG_ERROR("HTTP: No available systemd sockets");
 		return -1;
 	}
 
@@ -39,7 +50,7 @@ evutil_socket_t us_evhttp_bind_systemd(struct evhttp *http) {
 	assert(!evutil_make_socket_nonblocking(fd));
 
 	if (evhttp_accept_socket(http, fd) < 0) {
-		US_LOG_PERROR("Can't evhttp_accept_socket() systemd socket");
+		US_LOG_PERROR("HTTP: Can't evhttp_accept_socket() systemd socket");
 		return -1;
 	}
 	return fd;

src/ustreamer/http/systemd/systemd.h

@@ -22,16 +22,8 @@
 
 #pragma once
 
-#include <unistd.h>
-#include <assert.h>
-
 #include <event2/http.h>
 #include <event2/util.h>
 
-#include <systemd/sd-daemon.h>
-
-#include "../../../libs/tools.h"
-#include "../../../libs/logging.h"
-
 
 evutil_socket_t us_evhttp_bind_systemd(struct evhttp *http);

src/ustreamer/http/unix.c

@@ -22,13 +22,29 @@
 
 #include "unix.h"
 
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/stat.h>
+
+#include <event2/http.h>
+#include <event2/util.h>
+
+#include "../../libs/types.h"
+#include "../../libs/tools.h"
+#include "../../libs/logging.h"
+
 
 evutil_socket_t us_evhttp_bind_unix(struct evhttp *http, const char *path, bool rm, mode_t mode) {
 	struct sockaddr_un addr = {0};
-	const size_t max_sun_path = sizeof(addr.sun_path) - 1;
+	const uz max_sun_path = sizeof(addr.sun_path) - 1;
 
 	if (strlen(path) > max_sun_path) {
-		US_LOG_ERROR("UNIX socket path is too long; max=%zu", max_sun_path);
+		US_LOG_ERROR("HTTP: UNIX socket path is too long; max=%zu", max_sun_path);
 		return -1;
 	}
 
@@ -41,24 +57,24 @@ evutil_socket_t us_evhttp_bind_unix(struct evhttp *http, const char *path, bool
 
 	if (rm && unlink(path) < 0) {
 		if (errno != ENOENT) {
-			US_LOG_PERROR("Can't remove old UNIX socket '%s'", path);
+			US_LOG_PERROR("HTTP: Can't remove old UNIX socket '%s'", path);
 			return -1;
 		}
 	}
-	if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0) {
-		US_LOG_PERROR("Can't bind HTTP to UNIX socket '%s'", path);
+	if (bind(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0) {
+		US_LOG_PERROR("HTTP: Can't bind HTTP to UNIX socket '%s'", path);
 		return -1;
 	}
 	if (mode && chmod(path, mode) < 0) {
-		US_LOG_PERROR("Can't set permissions %o to UNIX socket '%s'", mode, path);
+		US_LOG_PERROR("HTTP: Can't set permissions %o to UNIX socket '%s'", mode, path);
 		return -1;
 	}
 	if (listen(fd, 128) < 0) {
-		US_LOG_PERROR("Can't listen UNIX socket '%s'", path);
+		US_LOG_PERROR("HTTP: Can't listen UNIX socket '%s'", path);
 		return -1;
 	}
 	if (evhttp_accept_socket(http, fd) < 0) {
-		US_LOG_PERROR("Can't evhttp_accept_socket() UNIX socket '%s'", path);
+		US_LOG_PERROR("HTTP: Can't evhttp_accept_socket() UNIX socket '%s'", path);
 		return -1;
 	}
 	return fd;

src/ustreamer/http/unix.h

@@ -22,21 +22,12 @@
 
 #pragma once
 
-#include <stdbool.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <assert.h>
-
-#include <sys/socket.h>
-#include <sys/un.h>
 #include <sys/stat.h>
 
 #include <event2/http.h>
 #include <event2/util.h>
 
-#include "../../libs/tools.h"
-#include "../../libs/logging.h"
+#include "../../libs/types.h"
 
 
 evutil_socket_t us_evhttp_bind_unix(struct evhttp *http, const char *path, bool rm, mode_t mode);

src/ustreamer/http/uri.c

@@ -22,6 +22,12 @@
 
 #include "uri.h"
 
+#include <event2/util.h>
+#include <event2/http.h>
+#include <event2/keyvalq_struct.h>
+
+#include "../../libs/types.h"
+
 
 bool us_uri_get_true(struct evkeyvalq *params, const char *key) {
 	const char *value_str = evhttp_find_header(params, key);

src/ustreamer/http/uri.h

@@ -22,12 +22,10 @@
 
 #pragma once
 
-#include <stdbool.h>
-
-#include <event2/util.h>
-#include <event2/http.h>
 #include <event2/keyvalq_struct.h>
 
+#include "../../libs/types.h"
+
 
 bool us_uri_get_true(struct evkeyvalq *params, const char *key);
 char *us_uri_get_string(struct evkeyvalq *params, const char *key);

src/ustreamer/m2m.c

@@ -22,16 +22,34 @@
 
 #include "m2m.h"
 
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <sys/mman.h>
+
+#include <linux/videodev2.h>
+
+#include "../libs/types.h"
+#include "../libs/tools.h"
+#include "../libs/logging.h"
+#include "../libs/frame.h"
+#include "../libs/xioctl.h"
+
 
 static us_m2m_encoder_s *_m2m_encoder_init(
-	const char *name, const char *path, unsigned output_format,
-	unsigned fps, unsigned bitrate, unsigned gop, unsigned quality, bool allow_dma);
+	const char *name, const char *path, uint output_format,
+	uint bitrate, uint gop, uint quality, bool allow_dma);
 
-static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame);
+static void _m2m_encoder_ensure(us_m2m_encoder_s *enc, const us_frame_s *frame);
 
 static int _m2m_encoder_init_buffers(
 	us_m2m_encoder_s *enc, const char *name, enum v4l2_buf_type type,
-	us_m2m_buffer_s **bufs_ptr, unsigned *n_bufs_ptr, bool dma);
+	us_m2m_buffer_s **bufs_ptr, uint *n_bufs_ptr, bool dma);
 
 static void _m2m_encoder_cleanup(us_m2m_encoder_s *enc);
 
@@ -44,18 +62,13 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 #define _E_LOG_VERBOSE(x_msg, ...)	US_LOG_VERBOSE("%s: " x_msg, enc->name, ##__VA_ARGS__)
 #define _E_LOG_DEBUG(x_msg, ...)	US_LOG_DEBUG("%s: " x_msg, enc->name, ##__VA_ARGS__)
 
-#define _RUN(x_next) enc->run->x_next
 
-
-us_m2m_encoder_s *us_m2m_h264_encoder_init(const char *name, const char *path, unsigned bitrate, unsigned gop) {
-	// FIXME: 30 or 0? https://github.com/6by9/yavta/blob/master/yavta.c#L2100
-	// По логике вещей правильно 0, но почему-то на низких разрешениях типа 640x480
-	// енкодер через несколько секунд перестает производить корректные фреймы.
+us_m2m_encoder_s *us_m2m_h264_encoder_init(const char *name, const char *path, uint bitrate, uint gop) {
 	bitrate *= 1000; // From Kbps
-	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_H264, 30, bitrate, gop, 0, true);
+	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_H264, bitrate, gop, 0, true);
 }
 
-us_m2m_encoder_s *us_m2m_mjpeg_encoder_init(const char *name, const char *path, unsigned quality) {
+us_m2m_encoder_s *us_m2m_mjpeg_encoder_init(const char *name, const char *path, uint quality) {
 	const double b_min = 25;
 	const double b_max = 20000;
 	const double step = 25;
@@ -63,13 +76,12 @@ us_m2m_encoder_s *us_m2m_mjpeg_encoder_init(const char *name, const char *path,
 	bitrate = step * round(bitrate / step);
 	bitrate *= 1000; // From Kbps
 	assert(bitrate > 0);
-	// FIXME: То же самое про 30 or 0, но еще даже не проверено на низких разрешениях
-	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_MJPEG, 30, bitrate, 0, 0, true);
+	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_MJPEG, bitrate, 0, 0, true);
 }
 
-us_m2m_encoder_s *us_m2m_jpeg_encoder_init(const char *name, const char *path, unsigned quality) {
+us_m2m_encoder_s *us_m2m_jpeg_encoder_init(const char *name, const char *path, uint quality) {
 	// FIXME: DMA не работает
-	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_JPEG, 30, 0, 0, quality, false);
+	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_JPEG, 0, 0, quality, false);
 }
 
 void us_m2m_encoder_destroy(us_m2m_encoder_s *enc) {
@@ -81,22 +93,18 @@ void us_m2m_encoder_destroy(us_m2m_encoder_s *enc) {
 }
 
 int us_m2m_encoder_compress(us_m2m_encoder_s *enc, const us_frame_s *src, us_frame_s *dest, bool force_key) {
+	us_m2m_encoder_runtime_s *const run = enc->run;
+
 	us_frame_encoding_begin(src, dest, (enc->output_format == V4L2_PIX_FMT_MJPEG ? V4L2_PIX_FMT_JPEG : enc->output_format));
 
-	if (
-		_RUN(width) != src->width
-		|| _RUN(height) != src->height
-		|| _RUN(input_format) != src->format
-		|| _RUN(stride) != src->stride
-		|| _RUN(dma) != (enc->allow_dma && src->dma_fd >= 0)
-	) {
-		_m2m_encoder_prepare(enc, src);
-	}
-	if (!_RUN(ready)) { // Already prepared but failed
+	_m2m_encoder_ensure(enc, src);
+	if (!run->ready) { // Already prepared but failed
 		return -1;
 	}
 
-	force_key = (enc->output_format == V4L2_PIX_FMT_H264 && (force_key || _RUN(last_online) != src->online));
+	force_key = (enc->output_format == V4L2_PIX_FMT_H264 && (force_key || run->last_online != src->online));
+
+	_E_LOG_DEBUG("Compressing new frame; force_key=%d ...", force_key);
 
 	if (_m2m_encoder_compress_raw(enc, src, dest, force_key) < 0) {
 		_m2m_encoder_cleanup(enc);
@@ -109,13 +117,13 @@ int us_m2m_encoder_compress(us_m2m_encoder_s *enc, const us_frame_s *src, us_fra
 	_E_LOG_VERBOSE("Compressed new frame: size=%zu, time=%0.3Lf, force_key=%d",
 		dest->used, dest->encode_end_ts - dest->encode_begin_ts, force_key);
 
-	_RUN(last_online) = src->online;
+	run->last_online = src->online;
 	return 0;
 }
 
 static us_m2m_encoder_s *_m2m_encoder_init(
-	const char *name, const char *path, unsigned output_format,
-	unsigned fps, unsigned bitrate, unsigned gop, unsigned quality, bool allow_dma) {
+	const char *name, const char *path, uint output_format,
+	uint bitrate, uint gop, uint quality, bool allow_dma) {
 
 	US_LOG_INFO("%s: Initializing encoder ...", name);
 
@@ -133,7 +141,6 @@ static us_m2m_encoder_s *_m2m_encoder_init(
 		enc->path = us_strdup(path);
 	}
 	enc->output_format = output_format;
-	enc->fps = fps;
 	enc->bitrate = bitrate;
 	enc->gop = gop;
 	enc->quality = quality;
@@ -143,30 +150,49 @@ static us_m2m_encoder_s *_m2m_encoder_init(
 }
 
 #define _E_XIOCTL(x_request, x_value, x_msg, ...) { \
-		if (us_xioctl(_RUN(fd), x_request, x_value) < 0) { \
+		if (us_xioctl(run->fd, x_request, x_value) < 0) { \
 			_E_LOG_PERROR(x_msg, ##__VA_ARGS__); \
 			goto error; \
 		} \
 	}
 
-static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame) {
+static void _m2m_encoder_ensure(us_m2m_encoder_s *enc, const us_frame_s *frame) {
+	us_m2m_encoder_runtime_s *const run = enc->run;
+
 	const bool dma = (enc->allow_dma && frame->dma_fd >= 0);
+	if (
+		run->p_width == frame->width
+		&& run->p_height == frame->height
+		&& run->p_input_format == frame->format
+		&& run->p_stride == frame->stride
+		&& run->p_dma == dma
+	) {
+		return; // Configured already
+	}
 
 	_E_LOG_INFO("Configuring encoder: DMA=%d ...", dma);
 
+	_E_LOG_DEBUG("Encoder changes: width=%u->%u, height=%u->%u, input_format=%u->%u, stride=%u->%u, dma=%u->%u",
+		run->p_width, frame->width,
+		run->p_height, frame->height,
+		run->p_input_format, frame->format,
+		run->p_stride, frame->stride,
+		run->p_dma, dma);
+
 	_m2m_encoder_cleanup(enc);
 
-	_RUN(width) = frame->width;
-	_RUN(height) = frame->height;
-	_RUN(input_format) = frame->format;
-	_RUN(stride) = frame->stride;
-	_RUN(dma) = dma;
+	run->p_width = frame->width;
+	run->p_height = frame->height;
+	run->p_input_format = frame->format;
+	run->p_stride = frame->stride;
+	run->p_dma = dma;
 
-	if ((_RUN(fd) = open(enc->path, O_RDWR)) < 0) {
+	_E_LOG_DEBUG("Opening encoder device ...");
+	if ((run->fd = open(enc->path, O_RDWR)) < 0) {
 		_E_LOG_PERROR("Can't open encoder device");
 		goto error;
 	}
-	_E_LOG_DEBUG("Encoder device fd=%d opened", _RUN(fd));
+	_E_LOG_DEBUG("Encoder device fd=%d opened", run->fd);
 
 #	define SET_OPTION(x_cid, x_value) { \
 			struct v4l2_control m_ctl = {0}; \
@@ -175,12 +201,11 @@ static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame)
 			_E_LOG_DEBUG("Configuring option " #x_cid " ..."); \
 			_E_XIOCTL(VIDIOC_S_CTRL, &m_ctl, "Can't set option " #x_cid); \
 		}
-
 	if (enc->output_format == V4L2_PIX_FMT_H264) {
 		SET_OPTION(V4L2_CID_MPEG_VIDEO_BITRATE,				enc->bitrate);
 		SET_OPTION(V4L2_CID_MPEG_VIDEO_H264_I_PERIOD,		enc->gop);
 		SET_OPTION(V4L2_CID_MPEG_VIDEO_H264_PROFILE,		V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE);
-		if (_RUN(width) * _RUN(height) <= 1920 * 1080) { // https://forums.raspberrypi.com/viewtopic.php?t=291447#p1762296
+		if (run->p_width * run->p_height <= 1920 * 1080) { // https://forums.raspberrypi.com/viewtopic.php?t=291447#p1762296
 			SET_OPTION(V4L2_CID_MPEG_VIDEO_H264_LEVEL,		V4L2_MPEG_VIDEO_H264_LEVEL_4_0);
 		} else {
 			SET_OPTION(V4L2_CID_MPEG_VIDEO_H264_LEVEL,		V4L2_MPEG_VIDEO_H264_LEVEL_5_1);
@@ -193,19 +218,18 @@ static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame)
 	} else if (enc->output_format == V4L2_PIX_FMT_JPEG) {
 		SET_OPTION(V4L2_CID_JPEG_COMPRESSION_QUALITY,		enc->quality);
 	}
-
 #	undef SET_OPTION
 
 	{
 		struct v4l2_format fmt = {0};
 		fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
-		fmt.fmt.pix_mp.width = _RUN(width);
-		fmt.fmt.pix_mp.height = _RUN(height);
-		fmt.fmt.pix_mp.pixelformat = _RUN(input_format);
+		fmt.fmt.pix_mp.width = run->p_width;
+		fmt.fmt.pix_mp.height = run->p_height;
+		fmt.fmt.pix_mp.pixelformat = run->p_input_format;
 		fmt.fmt.pix_mp.field = V4L2_FIELD_ANY;
 		fmt.fmt.pix_mp.colorspace = V4L2_COLORSPACE_JPEG; // libcamera currently has no means to request the right colour space
 		fmt.fmt.pix_mp.num_planes = 1;
-		// fmt.fmt.pix_mp.plane_fmt[0].bytesperline = _RUN(stride);
+		// fmt.fmt.pix_mp.plane_fmt[0].bytesperline = run->p_stride;
 		_E_LOG_DEBUG("Configuring INPUT format ...");
 		_E_XIOCTL(VIDIOC_S_FMT, &fmt, "Can't set INPUT format");
 	}
@@ -213,8 +237,8 @@ static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame)
 	{
 		struct v4l2_format fmt = {0};
 		fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
-		fmt.fmt.pix_mp.width = _RUN(width);
-		fmt.fmt.pix_mp.height = _RUN(height);
+		fmt.fmt.pix_mp.width = run->p_width;
+		fmt.fmt.pix_mp.height = run->p_height;
 		fmt.fmt.pix_mp.pixelformat = enc->output_format;
 		fmt.fmt.pix_mp.field = V4L2_FIELD_ANY;
 		fmt.fmt.pix_mp.colorspace = V4L2_COLORSPACE_DEFAULT;
@@ -236,21 +260,37 @@ static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame)
 		}
 	}
 
-	if (enc->fps > 0) { // TODO: Check this for MJPEG
+	if (run->p_width * run->p_height <= 1280 * 720) {
+		// H264 требует каких-то лимитов. Больше 30 не поддерживается, а при 0
+		// через какое-то время начинает производить некорректные фреймы.
+		// Если же привысить fps, то резко увеличивается время кодирования.
+		run->fps_limit = 60;
+	} else {
+		run->fps_limit = 30;
+	}
+	// H264: 30 or 0? https://github.com/6by9/yavta/blob/master/yavta.c#L2100
+	// По логике вещей правильно 0, но почему-то на низких разрешениях типа 640x480
+	// енкодер через несколько секунд перестает производить корректные фреймы.
+	// JPEG: То же самое про 30 or 0, но еще даже не проверено на низких разрешениях.
+	{
 		struct v4l2_streamparm setfps = {0};
 		setfps.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
 		setfps.parm.output.timeperframe.numerator = 1;
-		setfps.parm.output.timeperframe.denominator = enc->fps;
+		setfps.parm.output.timeperframe.denominator = run->fps_limit;
 		_E_LOG_DEBUG("Configuring INPUT FPS ...");
 		_E_XIOCTL(VIDIOC_S_PARM, &setfps, "Can't set INPUT FPS");
 	}
 
-	if (_m2m_encoder_init_buffers(enc, (dma ? "INPUT-DMA" : "INPUT"), V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
-		&_RUN(input_bufs), &_RUN(n_input_bufs), dma) < 0) {
+	if (_m2m_encoder_init_buffers(
+		enc, (dma ? "INPUT-DMA" : "INPUT"), V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
+		&run->input_bufs, &run->n_input_bufs, dma
+	) < 0) {
 		goto error;
 	}
-	if (_m2m_encoder_init_buffers(enc, "OUTPUT", V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
-		&_RUN(output_bufs), &_RUN(n_output_bufs), false) < 0) {
+	if (_m2m_encoder_init_buffers(
+		enc, "OUTPUT", V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
+		&run->output_bufs, &run->n_output_bufs, false
+	) < 0) {
 		goto error;
 	}
 
@@ -264,18 +304,20 @@ static void _m2m_encoder_prepare(us_m2m_encoder_s *enc, const us_frame_s *frame)
 		_E_XIOCTL(VIDIOC_STREAMON, &type, "Can't start OUTPUT");
 	}
 
-	_RUN(ready) = true;
-	_E_LOG_DEBUG("Encoder state: *** READY ***");
+	run->ready = true;
+	_E_LOG_INFO("Encoder is ready");
 	return;
 
-	error:
-		_m2m_encoder_cleanup(enc);
-		_E_LOG_ERROR("Encoder destroyed due an error (prepare)");
+error:
+	_m2m_encoder_cleanup(enc);
+	_E_LOG_ERROR("Encoder destroyed due an error (prepare)");
 }
 
 static int _m2m_encoder_init_buffers(
 	us_m2m_encoder_s *enc, const char *name, enum v4l2_buf_type type,
-	us_m2m_buffer_s **bufs_ptr, unsigned *n_bufs_ptr, bool dma) {
+	us_m2m_buffer_s **bufs_ptr, uint *n_bufs_ptr, bool dma) {
+
+	us_m2m_encoder_runtime_s *const run = enc->run;
 
 	_E_LOG_DEBUG("Initializing %s buffers ...", name);
 
@@ -294,98 +336,102 @@ static int _m2m_encoder_init_buffers(
 
 	if (dma) {
 		*n_bufs_ptr = req.count;
-	} else {
-		US_CALLOC(*bufs_ptr, req.count);
-		for (*n_bufs_ptr = 0; *n_bufs_ptr < req.count; ++(*n_bufs_ptr)) {
-			struct v4l2_buffer buf = {0};
-			struct v4l2_plane plane = {0};
-			buf.type = type;
-			buf.memory = V4L2_MEMORY_MMAP;
-			buf.index = *n_bufs_ptr;
-			buf.length = 1;
-			buf.m.planes = &plane;
-
-			_E_LOG_DEBUG("Querying %s buffer=%u ...", name, *n_bufs_ptr);
-			_E_XIOCTL(VIDIOC_QUERYBUF, &buf, "Can't query %s buffer=%u", name, *n_bufs_ptr);
-
-			_E_LOG_DEBUG("Mapping %s buffer=%u ...", name, *n_bufs_ptr);
-			if (((*bufs_ptr)[*n_bufs_ptr].data = mmap(
-				NULL,
-				plane.length,
-				PROT_READ | PROT_WRITE,
-				MAP_SHARED,
-				_RUN(fd),
-				plane.m.mem_offset
-			)) == MAP_FAILED) {
-				_E_LOG_PERROR("Can't map %s buffer=%u", name, *n_bufs_ptr);
-				goto error;
-			}
-			assert((*bufs_ptr)[*n_bufs_ptr].data != NULL);
-			(*bufs_ptr)[*n_bufs_ptr].allocated = plane.length;
-
-			_E_LOG_DEBUG("Queuing %s buffer=%u ...", name, *n_bufs_ptr);
-			_E_XIOCTL(VIDIOC_QBUF, &buf, "Can't queue %s buffer=%u", name, *n_bufs_ptr);
-		}
+		return 0;
 	}
 
+	US_CALLOC(*bufs_ptr, req.count);
+	for (*n_bufs_ptr = 0; *n_bufs_ptr < req.count; ++(*n_bufs_ptr)) {
+		struct v4l2_buffer buf = {0};
+		struct v4l2_plane plane = {0};
+		buf.type = type;
+		buf.memory = V4L2_MEMORY_MMAP;
+		buf.index = *n_bufs_ptr;
+		buf.length = 1;
+		buf.m.planes = &plane;
+
+		_E_LOG_DEBUG("Querying %s buffer=%u ...", name, *n_bufs_ptr);
+		_E_XIOCTL(VIDIOC_QUERYBUF, &buf, "Can't query %s buffer=%u", name, *n_bufs_ptr);
+
+		_E_LOG_DEBUG("Mapping %s buffer=%u ...", name, *n_bufs_ptr);
+		if (((*bufs_ptr)[*n_bufs_ptr].data = mmap(
+			NULL, plane.length,
+			PROT_READ | PROT_WRITE, MAP_SHARED,
+			run->fd, plane.m.mem_offset
+		)) == MAP_FAILED) {
+			_E_LOG_PERROR("Can't map %s buffer=%u", name, *n_bufs_ptr);
+			goto error;
+		}
+		assert((*bufs_ptr)[*n_bufs_ptr].data != NULL);
+		(*bufs_ptr)[*n_bufs_ptr].allocated = plane.length;
+
+		_E_LOG_DEBUG("Queuing %s buffer=%u ...", name, *n_bufs_ptr);
+		_E_XIOCTL(VIDIOC_QBUF, &buf, "Can't queue %s buffer=%u", name, *n_bufs_ptr);
+	}
+	_E_LOG_DEBUG("All %s buffers are ready", name);
 	return 0;
-	error:
-		return -1;
+
+error: // Mostly for _E_XIOCTL
+	return -1;
 }
 
 static void _m2m_encoder_cleanup(us_m2m_encoder_s *enc) {
-	if (_RUN(ready)) {
+	us_m2m_encoder_runtime_s *const run = enc->run;
+
+	bool say = false;
+
+	if (run->ready) {
+		say = true;
 #		define STOP_STREAM(x_name, x_type) { \
 				enum v4l2_buf_type m_type_var = x_type; \
 				_E_LOG_DEBUG("Stopping %s ...", x_name); \
-				if (us_xioctl(_RUN(fd), VIDIOC_STREAMOFF, &m_type_var) < 0) { \
+				if (us_xioctl(run->fd, VIDIOC_STREAMOFF, &m_type_var) < 0) { \
 					_E_LOG_PERROR("Can't stop %s", x_name); \
 				} \
 			}
-
 		STOP_STREAM("OUTPUT", V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
 		STOP_STREAM("INPUT", V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
-
 #		undef STOP_STREAM
 	}
 
-#	define DESTROY_BUFFERS(x_name, x_target) { \
-		if (_RUN(x_target##_bufs) != NULL) { \
-			for (unsigned m_index = 0; m_index < _RUN(n_##x_target##_bufs); ++m_index) { \
-				if (_RUN(x_target##_bufs[m_index].allocated) > 0 && _RUN(x_target##_bufs[m_index].data) != NULL) { \
-					if (munmap(_RUN(x_target##_bufs[m_index].data), _RUN(x_target##_bufs[m_index].allocated)) < 0) { \
+#	define DELETE_BUFFERS(x_name, x_target) { \
+		if (run->x_target##_bufs != NULL) { \
+			say = true; \
+			for (uint m_index = 0; m_index < run->n_##x_target##_bufs; ++m_index) { \
+				us_m2m_buffer_s *m_buf = &run->x_target##_bufs[m_index]; \
+				if (m_buf->allocated > 0 && m_buf->data != NULL) { \
+					if (munmap(m_buf->data, m_buf->allocated) < 0) { \
 						_E_LOG_PERROR("Can't unmap %s buffer=%u", #x_name, m_index); \
 					} \
 				} \
 			} \
-			free(_RUN(x_target##_bufs)); \
-			_RUN(x_target##_bufs) = NULL; \
+			US_DELETE(run->x_target##_bufs, free); \
 		} \
-		_RUN(n_##x_target##_bufs) = 0; \
+		run->n_##x_target##_bufs = 0; \
 	}
+	DELETE_BUFFERS("OUTPUT", output);
+	DELETE_BUFFERS("INPUT", input);
+#	undef DELETE_BUFFERS
 
-	DESTROY_BUFFERS("OUTPUT", output);
-	DESTROY_BUFFERS("INPUT", input);
-
-#	undef DESTROY_BUFFERS
-
-	if (_RUN(fd) >= 0) {
-		if (close(_RUN(fd)) < 0) {
+	if (run->fd >= 0) {
+		say = true;
+		if (close(run->fd) < 0) {
 			_E_LOG_PERROR("Can't close encoder device");
 		}
-		_RUN(fd) = -1;
+		run->fd = -1;
 	}
 
-	_RUN(last_online) = -1;
-	_RUN(ready) = false;
+	run->last_online = -1;
+	run->ready = false;
 
-	_E_LOG_DEBUG("Encoder state: ~~~ NOT READY ~~~");
+	if (say) {
+		_E_LOG_INFO("Encoder closed");
+	}
 }
 
 static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *src, us_frame_s *dest, bool force_key) {
-	assert(_RUN(ready));
+	us_m2m_encoder_runtime_s *const run = enc->run;
 
-	_E_LOG_DEBUG("Compressing new frame; force_key=%d ...", force_key);
+	assert(run->ready);
 
 	if (force_key) {
 		struct v4l2_control ctl = {0};
@@ -401,7 +447,7 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 	input_buf.length = 1;
 	input_buf.m.planes = &input_plane;
 
-	if (_RUN(dma)) {
+	if (run->p_dma) {
 		input_buf.index = 0;
 		input_buf.memory = V4L2_MEMORY_DMABUF;
 		input_buf.field = V4L2_FIELD_NONE;
@@ -411,39 +457,47 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 		input_buf.memory = V4L2_MEMORY_MMAP;
 		_E_LOG_DEBUG("Grabbing INPUT buffer ...");
 		_E_XIOCTL(VIDIOC_DQBUF, &input_buf, "Can't grab INPUT buffer");
-		if (input_buf.index >= _RUN(n_input_bufs)) {
+		if (input_buf.index >= run->n_input_bufs) {
 			_E_LOG_ERROR("V4L2 error: grabbed invalid INPUT: buffer=%u, n_bufs=%u",
-				input_buf.index, _RUN(n_input_bufs));
+				input_buf.index, run->n_input_bufs);
 			goto error;
 		}
 		_E_LOG_DEBUG("Grabbed INPUT buffer=%u", input_buf.index);
 	}
 
-	const uint64_t now = us_get_now_monotonic_u64();
+	const u64 now_ts = us_get_now_monotonic_u64();
 	struct timeval ts = {
-		.tv_sec = now / 1000000,
-		.tv_usec = now % 1000000,
+		.tv_sec = now_ts / 1000000,
+		.tv_usec = now_ts % 1000000,
 	};
 
 	input_buf.timestamp.tv_sec = ts.tv_sec;
 	input_buf.timestamp.tv_usec = ts.tv_usec;
 	input_plane.bytesused = src->used;
 	input_plane.length = src->used;
-	if (!_RUN(dma)) {
-		memcpy(_RUN(input_bufs[input_buf.index].data), src->data, src->used);
+	if (!run->p_dma) {
+		memcpy(run->input_bufs[input_buf.index].data, src->data, src->used);
 	}
 
-	const char *input_name = (_RUN(dma) ? "INPUT-DMA" : "INPUT");
+	const char *input_name = (run->p_dma ? "INPUT-DMA" : "INPUT");
 
-	_E_LOG_DEBUG("Sending%s %s buffer ...", (!_RUN(dma) ? " (releasing)" : ""), input_name);
+	_E_LOG_DEBUG("Sending%s %s buffer ...", (!run->p_dma ? " (releasing)" : ""), input_name);
 	_E_XIOCTL(VIDIOC_QBUF, &input_buf, "Can't send %s buffer", input_name);
 
 	// Для не-DMA отправка буфера по факту являтся освобождением этого буфера
-	bool input_released = !_RUN(dma);
+	bool input_released = !run->p_dma;
+
+	// https://github.com/pikvm/ustreamer/issues/253
+	// За секунду точно должно закодироваться.
+	const ldf deadline_ts = us_get_now_monotonic() + 1;
 
 	while (true) {
-		struct pollfd enc_poll = {_RUN(fd), POLLIN, 0};
+		if (us_get_now_monotonic() > deadline_ts) {
+			_E_LOG_ERROR("Waiting for the encoder is too long");
+			goto error;
+		}
 
+		struct pollfd enc_poll = {run->fd, POLLIN, 0};
 		_E_LOG_DEBUG("Polling encoder ...");
 		if (poll(&enc_poll, 1, 1000) < 0 && errno != EINTR) {
 			_E_LOG_PERROR("Can't poll encoder");
@@ -474,7 +528,7 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 				// входному (с тем же таймстампом).
 				_E_LOG_DEBUG("Need to retry OUTPUT buffer due timestamp mismatch");
 			} else {
-				us_frame_set_data(dest, _RUN(output_bufs[output_buf.index].data), output_plane.bytesused);
+				us_frame_set_data(dest, run->output_bufs[output_buf.index].data, output_plane.bytesused);
 				dest->key = output_buf.flags & V4L2_BUF_FLAG_KEYFRAME;
 				dest->gop = enc->gop;
 				done = true;
@@ -488,10 +542,10 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 			}
 		}
 	}
-
 	return 0;
-	error:
-		return -1;
+
+error: // Mostly for _E_XIOCTL
+	return -1;
 }
 
 #undef _E_XIOCTL

src/ustreamer/m2m.h

@@ -22,65 +22,49 @@
 
 #pragma once
 
-#include <stdlib.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <math.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <errno.h>
-#include <assert.h>
-
-#include <sys/mman.h>
-
-#include <linux/videodev2.h>
-
-#include "../libs/tools.h"
-#include "../libs/logging.h"
+#include "../libs/types.h"
 #include "../libs/frame.h"
-#include "../libs/xioctl.h"
 
 
 typedef struct {
-	uint8_t	*data;
-	size_t	allocated;
+	u8	*data;
+	uz	allocated;
 } us_m2m_buffer_s;
 
 typedef struct {
 	int				fd;
+	uint			fps_limit;
 	us_m2m_buffer_s	*input_bufs;
-	unsigned		n_input_bufs;
+	uint			n_input_bufs;
 	us_m2m_buffer_s	*output_bufs;
-	unsigned		n_output_bufs;
+	uint			n_output_bufs;
 
-	unsigned		width;
-	unsigned		height;
-	unsigned		input_format;
-	unsigned		stride;
-	bool			dma;
-	bool			ready;
+	uint	p_width;
+	uint	p_height;
+	uint	p_input_format;
+	uint	p_stride;
+	bool	p_dma;
 
-	int				last_online;
+	bool	ready;
+	int		last_online;
 } us_m2m_encoder_runtime_s;
 
 typedef struct {
-	char			*name;
-	char			*path;
-	unsigned		output_format;
-	unsigned		fps;
-	unsigned		bitrate;
-	unsigned		gop;
-	unsigned		quality;
-	bool			allow_dma;
+	char	*name;
+	char	*path;
+	uint	output_format;
+	uint	bitrate;
+	uint	gop;
+	uint	quality;
+	bool	allow_dma;
 
 	us_m2m_encoder_runtime_s *run;
 } us_m2m_encoder_s;
 
 
-us_m2m_encoder_s *us_m2m_h264_encoder_init(const char *name, const char *path, unsigned bitrate, unsigned gop);
-us_m2m_encoder_s *us_m2m_mjpeg_encoder_init(const char *name, const char *path, unsigned quality);
-us_m2m_encoder_s *us_m2m_jpeg_encoder_init(const char *name, const char *path, unsigned quality);
+us_m2m_encoder_s *us_m2m_h264_encoder_init(const char *name, const char *path, uint bitrate, uint gop);
+us_m2m_encoder_s *us_m2m_mjpeg_encoder_init(const char *name, const char *path, uint quality);
+us_m2m_encoder_s *us_m2m_jpeg_encoder_init(const char *name, const char *path, uint quality);
 void us_m2m_encoder_destroy(us_m2m_encoder_s *enc);
 
 int us_m2m_encoder_compress(us_m2m_encoder_s *enc, const us_frame_s *src, us_frame_s *dest, bool force_key);

src/ustreamer/main.c

@@ -22,7 +22,6 @@
 
 #include <stdio.h>
 #include <stdbool.h>
-#include <signal.h>
 
 #include <pthread.h>
 
@@ -30,6 +29,7 @@
 #include "../libs/threading.h"
 #include "../libs/logging.h"
 #include "../libs/device.h"
+#include "../libs/signal.h"
 
 #include "options.h"
 #include "encoder.h"
@@ -54,7 +54,7 @@ static void _block_thread_signals(void) {
 
 static void *_stream_loop_thread(void *arg) {
 	(void)arg;
-	US_THREAD_RENAME("stream");
+	US_THREAD_SETTLE("stream");
 	_block_thread_signals();
 	us_stream_loop(_g_stream);
 	return NULL;
@@ -62,7 +62,7 @@ static void *_stream_loop_thread(void *arg) {
 
 static void *_server_loop_thread(void *arg) {
 	(void)arg;
-	US_THREAD_RENAME("http");
+	US_THREAD_SETTLE("http");
 	_block_thread_signals();
 	us_server_loop(_g_server);
 	return NULL;
@@ -76,24 +76,6 @@ static void _signal_handler(int signum) {
 	us_server_loop_break(_g_server);
 }
 
-static void _install_signal_handlers(void) {
-	struct sigaction sig_act = {0};
-
-	assert(!sigemptyset(&sig_act.sa_mask));
-	sig_act.sa_handler = _signal_handler;
-	assert(!sigaddset(&sig_act.sa_mask, SIGINT));
-	assert(!sigaddset(&sig_act.sa_mask, SIGTERM));
-
-	US_LOG_DEBUG("Installing SIGINT handler ...");
-	assert(!sigaction(SIGINT, &sig_act, NULL));
-
-	US_LOG_DEBUG("Installing SIGTERM handler ...");
-	assert(!sigaction(SIGTERM, &sig_act, NULL));
-
-	US_LOG_DEBUG("Ignoring SIGPIPE ...");
-	assert(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
-}
-
 int main(int argc, char *argv[]) {
 	assert(argc >= 0);
 	int exit_code = 0;
@@ -112,7 +94,7 @@ int main(int argc, char *argv[]) {
 		us_gpio_init();
 #		endif
 
-		_install_signal_handlers();
+		us_install_signals_handler(_signal_handler, true);
 
 		if ((exit_code = us_server_listen(_g_server)) == 0) {
 #			ifdef WITH_GPIO

src/ustreamer/options.c

@@ -250,12 +250,10 @@ us_options_s *us_options_init(unsigned argc, char *argv[]) {
 }
 
 void us_options_destroy(us_options_s *options) {
-	US_DELETE(options->sink, us_memsink_destroy);
+	US_DELETE(options->jpeg_sink, us_memsink_destroy);
 	US_DELETE(options->raw_sink, us_memsink_destroy);
 	US_DELETE(options->h264_sink, us_memsink_destroy);
 
-	US_DELETE(options->blank, us_frame_destroy);
-
 	for (unsigned index = 0; index < options->argc; ++index) {
 		free(options->argv_copy[index]);
 	}
@@ -298,11 +296,13 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 			break; \
 		}
 
-#	define OPT_PARSE(x_name, x_dest, x_func, x_invalid, x_available) { \
-			if ((x_dest = x_func(optarg)) == x_invalid) { \
+#	define OPT_PARSE_ENUM(x_name, x_dest, x_func, x_available) { \
+			const int m_value = x_func(optarg); \
+			if (m_value < 0) { \
 				printf("Unknown " x_name ": %s; available: %s\n", optarg, x_available); \
 				return -1; \
 			} \
+			x_dest = m_value; \
 			break; \
 		}
 
@@ -332,15 +332,13 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 			break; \
 		}
 
-	char *blank_path = NULL;
-
 #	define ADD_SINK(x_prefix) \
 		char *x_prefix##_name = NULL; \
 		mode_t x_prefix##_mode = 0660; \
 		bool x_prefix##_rm = false; \
 		unsigned x_prefix##_client_ttl = 10; \
 		unsigned x_prefix##_timeout = 1;
-	ADD_SINK(sink);
+	ADD_SINK(jpeg_sink);
 	ADD_SINK(raw_sink);
 	ADD_SINK(h264_sink);
 #	undef ADD_SINK
@@ -359,10 +357,10 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 			case _O_RESOLUTION:			OPT_RESOLUTION("--resolution", dev->width, dev->height, true);
 #			pragma GCC diagnostic ignored "-Wsign-compare"
 #			pragma GCC diagnostic push
-			case _O_FORMAT:				OPT_PARSE("pixel format", dev->format, us_device_parse_format, US_FORMAT_UNKNOWN, US_FORMATS_STR);
+			case _O_FORMAT:				OPT_PARSE_ENUM("pixel format", dev->format, us_device_parse_format, US_FORMATS_STR);
 #			pragma GCC diagnostic pop
-			case _O_TV_STANDARD:		OPT_PARSE("TV standard", dev->standard, us_device_parse_standard, US_STANDARD_UNKNOWN, US_STANDARDS_STR);
-			case _O_IO_METHOD:			OPT_PARSE("IO method", dev->io_method, us_device_parse_io_method, US_IO_METHOD_UNKNOWN, US_IO_METHODS_STR);
+			case _O_TV_STANDARD:		OPT_PARSE_ENUM("TV standard", dev->standard, us_device_parse_standard, US_STANDARDS_STR);
+			case _O_IO_METHOD:			OPT_PARSE_ENUM("IO method", dev->io_method, us_device_parse_io_method, US_IO_METHODS_STR);
 			case _O_DESIRED_FPS:		OPT_NUMBER("--desired-fps", dev->desired_fps, 0, US_VIDEO_MAX_FPS, 0);
 			case _O_MIN_FRAME_SIZE:		OPT_NUMBER("--min-frame-size", dev->min_frame_size, 1, 8192, 0);
 			case _O_PERSISTENT:			OPT_SET(dev->persistent, true);
@@ -370,10 +368,10 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 			case _O_BUFFERS:			OPT_NUMBER("--buffers", dev->n_bufs, 1, 32, 0);
 			case _O_WORKERS:			OPT_NUMBER("--workers", enc->n_workers, 1, 32, 0);
 			case _O_QUALITY:			OPT_NUMBER("--quality", dev->jpeg_quality, 1, 100, 0);
-			case _O_ENCODER:			OPT_PARSE("encoder type", enc->type, us_encoder_parse_type, US_ENCODER_TYPE_UNKNOWN, ENCODER_TYPES_STR);
+			case _O_ENCODER:			OPT_PARSE_ENUM("encoder type", enc->type, us_encoder_parse_type, ENCODER_TYPES_STR);
 			case _O_GLITCHED_RESOLUTIONS: break; // Deprecated
-			case _O_BLANK:				OPT_SET(blank_path, optarg);
-			case _O_LAST_AS_BLANK:		OPT_NUMBER("--last-as-blank", stream->last_as_blank, 0, 86400, 0);
+			case _O_BLANK:				break; // Deprecated
+			case _O_LAST_AS_BLANK:		break; // Deprecated
 			case _O_SLOWDOWN:			OPT_SET(stream->slowdown, true);
 			case _O_DEVICE_TIMEOUT:		OPT_NUMBER("--device-timeout", dev->timeout, 1, 60, 0);
 			case _O_DEVICE_ERROR_DELAY:	OPT_NUMBER("--device-error-delay", stream->error_delay, 1, 60, 0);
@@ -438,7 +436,7 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 				case _O_##x_up##_RM:			OPT_SET(x_lp##_rm, true); \
 				case _O_##x_up##_CLIENT_TTL:	OPT_NUMBER("--" #x_opt "sink-client-ttl", x_lp##_client_ttl, 1, 60, 0); \
 				case _O_##x_up##_TIMEOUT:		OPT_NUMBER("--" #x_opt "sink-timeout", x_lp##_timeout, 1, 60, 0);
-			ADD_SINK("", sink, SINK)
+			ADD_SINK("", jpeg_sink, SINK)
 			ADD_SINK("raw-", raw_sink, RAW_SINK)
 			ADD_SINK("h264-", h264_sink, H264_SINK)
 			case _O_H264_BITRATE:			OPT_NUMBER("--h264-bitrate", stream->h264_bitrate, 25, 20000, 0);
@@ -461,7 +459,7 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 				};
 				break;
 #			endif
-			case _O_EXIT_ON_NO_CLIENTS:		OPT_NUMBER("--exit-on-no-clients", server->exit_on_no_clients, 0, 86400, 0);
+			case _O_EXIT_ON_NO_CLIENTS:		OPT_NUMBER("--exit-on-no-clients", stream->exit_on_no_clients, 0, 86400, 0);
 #			ifdef WITH_SETPROCTITLE
 			case _O_PROCESS_NAME_PREFIX:	OPT_SET(process_name_prefix, optarg);
 #			endif
@@ -485,9 +483,6 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 
 	US_LOG_INFO("Starting PiKVM uStreamer %s ...", US_VERSION);
 
-	options->blank = us_blank_frame_init(blank_path);
-	stream->blank = options->blank;
-
 #	define ADD_SINK(x_label, x_prefix) { \
 			if (x_prefix##_name && x_prefix##_name[0] != '\0') { \
 				options->x_prefix = us_memsink_init( \
@@ -502,7 +497,7 @@ int options_parse(us_options_s *options, us_device_s *dev, us_encoder_s *enc, us
 			} \
 			stream->x_prefix = options->x_prefix; \
 		}
-	ADD_SINK("JPEG", sink);
+	ADD_SINK("JPEG", jpeg_sink);
 	ADD_SINK("RAW", raw_sink);
 	ADD_SINK("H264", h264_sink);
 #	undef ADD_SINK
@@ -629,13 +624,8 @@ static void _help(FILE *fp, const us_device_s *dev, const us_encoder_s *enc, con
 	SAY("                                             * M2M-IMAGE  ── GPU-accelerated JPEG encoding using V4L2 M2M image interface;");
 	SAY("                                             * NOOP  ─────── Don't compress MJPEG stream (do nothing).\n");
 	SAY("    -g|--glitched-resolutions <WxH,...>  ─ It doesn't do anything. Still here for compatibility.\n");
-	SAY("    -k|--blank <path>  ─────────────────── Path to JPEG file that will be shown when the device is disconnected");
-	SAY("                                           during the streaming. Default: black screen 640x480 with 'NO SIGNAL'.\n");
-	SAY("    -K|--last-as-blank <sec>  ──────────── Show the last frame received from the camera after it was disconnected,");
-	SAY("                                           but no more than specified time (or endlessly if 0 is specified).");
-	SAY("                                           If the device has not yet been online, display 'NO SIGNAL' or the image");
-	SAY("                                           specified by option --blank. Default: disabled.");
-	SAY("                                           Note: currently this option has no effect on memory sinks.\n");
+	SAY("    -k|--blank <path>  ─────────────────── It doesn't do anything. Still here for compatibility.\n");
+	SAY("    -K|--last-as-blank <sec>  ──────────── It doesn't do anything. Still here for compatibility.\n");
 	SAY("    -l|--slowdown  ─────────────────────── Slowdown capturing to 1 FPS or less when no stream or sink clients");
 	SAY("                                           are connected. Useful to reduce CPU consumption. Default: disabled.\n");
 	SAY("    --device-timeout <sec>  ────────────── Timeout for device querying. Default: %u.\n", dev->timeout);

src/ustreamer/options.h

@@ -42,7 +42,6 @@
 #include "../libs/device.h"
 
 #include "encoder.h"
-#include "blank.h"
 #include "stream.h"
 #include "http/server.h"
 #ifdef WITH_GPIO
@@ -54,8 +53,7 @@ typedef struct {
 	unsigned		argc;
 	char			**argv;
 	char			**argv_copy;
-	us_frame_s		*blank;
-	us_memsink_s	*sink;
+	us_memsink_s	*jpeg_sink;
 	us_memsink_s	*raw_sink;
 	us_memsink_s	*h264_sink;
 } us_options_s;

src/ustreamer/stream.c

@@ -22,338 +22,557 @@
 
 #include "stream.h"
 
+#include <stdlib.h>
+#include <stdatomic.h>
+#include <unistd.h>
+#include <errno.h>
+#include <assert.h>
 
-static us_workers_pool_s *_stream_init_loop(us_stream_s *stream);
-static us_workers_pool_s *_stream_init_one(us_stream_s *stream);
-static void _stream_expose_frame(us_stream_s *stream, us_frame_s *frame, unsigned captured_fps);
+#include <pthread.h>
+
+#include "../libs/types.h"
+#include "../libs/tools.h"
+#include "../libs/threading.h"
+#include "../libs/process.h"
+#include "../libs/logging.h"
+#include "../libs/ring.h"
+#include "../libs/frame.h"
+#include "../libs/memsink.h"
+#include "../libs/device.h"
+
+#include "blank.h"
+#include "encoder.h"
+#include "workers.h"
+#include "h264.h"
+#ifdef WITH_GPIO
+#	include "gpio/gpio.h"
+#endif
 
 
-#define _RUN(x_next) stream->run->x_next
+typedef struct {
+	pthread_t		tid;
+	us_device_s		*dev;
+	us_queue_s		*queue;
+	pthread_mutex_t	*mutex;
+	atomic_bool		*stop;
+} _releaser_context_s;
 
-#define _SINK_PUT(x_sink, x_frame) { \
-		if (stream->x_sink && us_memsink_server_check(stream->x_sink, x_frame)) {\
-			bool m_key_requested; /* Unused */ \
-			us_memsink_server_put(stream->x_sink, x_frame, &m_key_requested); \
-		} \
-	}
+typedef struct {
+	pthread_t	tid;
+	us_queue_s	*queue;
+	us_stream_s	*stream;
+	atomic_bool	*stop;
+} _worker_context_s;
 
-#define _H264_PUT(x_frame, x_force_key) { \
-		if (_RUN(h264)) { \
-			us_h264_stream_process(_RUN(h264), x_frame, x_force_key); \
-		} \
-	}
+
+static void _stream_set_capture_state(us_stream_s *stream, uint width, uint height, bool online, uint captured_fps);
+
+static void *_releaser_thread(void *v_ctx);
+static void *_jpeg_thread(void *v_ctx);
+static void *_h264_thread(void *v_ctx);
+static void *_raw_thread(void *v_ctx);
+
+static us_hw_buffer_s *_get_latest_hw(us_queue_s *queue);
+
+static bool _stream_has_jpeg_clients_cached(us_stream_s *stream);
+static bool _stream_has_any_clients_cached(us_stream_s *stream);
+static int _stream_init_loop(us_stream_s *stream);
+static void _stream_expose_jpeg(us_stream_s *stream, const us_frame_s *frame);
+static void _stream_expose_raw(us_stream_s *stream, const us_frame_s *frame);
+static void _stream_check_suicide(us_stream_s *stream);
 
 
 us_stream_s *us_stream_init(us_device_s *dev, us_encoder_s *enc) {
 	us_stream_runtime_s *run;
 	US_CALLOC(run, 1);
+	US_RING_INIT_WITH_ITEMS(run->http_jpeg_ring, 4, us_frame_init);
+	atomic_init(&run->http_has_clients, false);
+	atomic_init(&run->http_snapshot_requested, 0);
+	atomic_init(&run->http_last_request_ts, 0);
+	atomic_init(&run->http_capture_state, 0);
 	atomic_init(&run->stop, false);
-
-	us_video_s *video;
-	US_CALLOC(video, 1);
-	video->frame = us_frame_init();
-	atomic_init(&video->updated, false);
-	US_MUTEX_INIT(video->mutex);
-	atomic_init(&video->has_clients, false);
-	run->video = video;
+	run->blank = us_blank_init();
 
 	us_stream_s *stream;
 	US_CALLOC(stream, 1);
 	stream->dev = dev;
 	stream->enc = enc;
-	stream->last_as_blank = -1;
 	stream->error_delay = 1;
 	stream->h264_bitrate = 5000; // Kbps
 	stream->h264_gop = 30;
 	stream->run = run;
+
+	us_blank_draw(run->blank, "< NO SIGNAL >", dev->width, dev->height);
+	_stream_set_capture_state(stream, dev->width, dev->height, false, 0);
 	return stream;
 }
 
 void us_stream_destroy(us_stream_s *stream) {
-	US_MUTEX_DESTROY(_RUN(video->mutex));
-	us_frame_destroy(_RUN(video->frame));
-	free(_RUN(video));
+	us_blank_destroy(stream->run->blank);
+	US_RING_DELETE_WITH_ITEMS(stream->run->http_jpeg_ring, us_frame_destroy);
 	free(stream->run);
 	free(stream);
 }
 
 void us_stream_loop(us_stream_s *stream) {
-	assert(stream->blank != NULL);
+	us_stream_runtime_s *const run = stream->run;
+	us_device_s *const dev = stream->dev;
 
-	US_LOG_INFO("Using V4L2 device: %s", stream->dev->path);
-	US_LOG_INFO("Using desired FPS: %u", stream->dev->desired_fps);
+	US_LOG_INFO("Using V4L2 device: %s", dev->path);
+	US_LOG_INFO("Using desired FPS: %u", dev->desired_fps);
+
+	atomic_store(&run->http_last_request_ts, us_get_now_monotonic());
 
 	if (stream->h264_sink != NULL) {
-		_RUN(h264) = us_h264_stream_init(stream->h264_sink, stream->h264_m2m_path, stream->h264_bitrate, stream->h264_gop);
+		run->h264 = us_h264_stream_init(stream->h264_sink, stream->h264_m2m_path, stream->h264_bitrate, stream->h264_gop);
 	}
 
-	for (us_workers_pool_s *pool; (pool = _stream_init_loop(stream)) != NULL;) {
-		long double grab_after = 0;
-		unsigned fluency_passed = 0;
-		unsigned captured_fps = 0;
-		unsigned captured_fps_accum = 0;
-		long long captured_fps_second = 0;
+	while (!_stream_init_loop(stream)) {
+		atomic_bool threads_stop;
+		atomic_init(&threads_stop, false);
+
+		pthread_mutex_t release_mutex;
+		US_MUTEX_INIT(release_mutex);
+		const uint n_releasers = dev->run->n_bufs;
+		_releaser_context_s *releasers;
+		US_CALLOC(releasers, n_releasers);
+		for (uint index = 0; index < n_releasers; ++index) {
+			_releaser_context_s *ctx = &releasers[index];
+			ctx->dev = dev;
+			ctx->queue = us_queue_init(1);
+			ctx->mutex = &release_mutex;
+			ctx->stop = &threads_stop;
+			US_THREAD_CREATE(ctx->tid, _releaser_thread, ctx);
+		}
+
+		_worker_context_s jpeg_ctx = {
+			.queue = us_queue_init(dev->run->n_bufs),
+			.stream = stream,
+			.stop = &threads_stop,
+		};
+		US_THREAD_CREATE(jpeg_ctx.tid, _jpeg_thread, &jpeg_ctx);
+
+		_worker_context_s h264_ctx;
+		if (run->h264 != NULL) {
+			h264_ctx.queue = us_queue_init(dev->run->n_bufs);
+			h264_ctx.stream = stream;
+			h264_ctx.stop = &threads_stop;
+			US_THREAD_CREATE(h264_ctx.tid, _h264_thread, &h264_ctx);
+		}
+
+		_worker_context_s raw_ctx;
+		if (stream->raw_sink != NULL) {
+			raw_ctx.queue = us_queue_init(2);
+			raw_ctx.stream = stream;
+			raw_ctx.stop = &threads_stop;
+			US_THREAD_CREATE(raw_ctx.tid, _raw_thread, &raw_ctx);
+		}
+
+		uint captured_fps_accum = 0;
+		sll captured_fps_ts = 0;
+		uint captured_fps = 0;
 
 		US_LOG_INFO("Capturing ...");
 
-		while (!atomic_load(&_RUN(stop))) {
-			US_SEP_DEBUG('-');
-			US_LOG_DEBUG("Waiting for worker ...");
-
-			us_worker_s *const ready_wr = us_workers_pool_wait(pool);
-			us_encoder_job_s *const ready_job = (us_encoder_job_s *)(ready_wr->job);
-
-			if (ready_job->hw != NULL) {
-				if (us_device_release_buffer(stream->dev, ready_job->hw) < 0) {
-					ready_wr->job_failed = true;
-				}
-				ready_job->hw = NULL;
-
-				if (!ready_wr->job_failed) {
-					if (ready_wr->job_timely) {
-						_stream_expose_frame(stream, ready_job->dest, captured_fps);
-						US_LOG_PERF("##### Encoded JPEG exposed; worker=%s, latency=%.3Lf",
-							ready_wr->name, us_get_now_monotonic() - ready_job->dest->grab_ts);
-					} else {
-						US_LOG_PERF("----- Encoded JPEG dropped; worker=%s", ready_wr->name);
-					}
-				} else {
-					break;
-				}
+		uint slowdown_count = 0;
+		while (!atomic_load(&run->stop) && !atomic_load(&threads_stop)) {
+			us_hw_buffer_s *hw;
+			switch (us_device_grab_buffer(dev, &hw)) {
+				case -2: continue; // Broken frame
+				case -1: goto close; // Error
+				default: break; // Grabbed on >= 0
 			}
 
-			bool h264_force_key = false;
-			if (stream->slowdown) {
-				unsigned slc = 0;
-				for (; slc < 10 && !atomic_load(&_RUN(stop)) && !us_stream_has_clients(stream); ++slc) {
-					usleep(100000);
-				}
-				h264_force_key = (slc == 10);
+			const sll now_sec_ts = us_floor_ms(us_get_now_monotonic());
+			if (now_sec_ts != captured_fps_ts) {
+				captured_fps = captured_fps_accum;
+				captured_fps_accum = 0;
+				captured_fps_ts = now_sec_ts;
+				US_LOG_PERF_FPS("A new second has come; captured_fps=%u", captured_fps);
 			}
+			captured_fps_accum += 1;
 
-			if (atomic_load(&_RUN(stop))) {
-				break;
+			_stream_set_capture_state(stream, dev->run->width, dev->run->height, true, captured_fps);
+#			ifdef WITH_GPIO
+			us_gpio_set_stream_online(true);
+#			endif
+
+			us_device_buffer_incref(hw); // JPEG
+			us_queue_put(jpeg_ctx.queue, hw, 0);
+			if (run->h264 != NULL) {
+				us_device_buffer_incref(hw); // H264
+				us_queue_put(h264_ctx.queue, hw, 0);
 			}
+			if (stream->raw_sink != NULL) {
+				us_device_buffer_incref(hw); // RAW
+				us_queue_put(raw_ctx.queue, hw, 0);
+			}
+			us_queue_put(releasers[hw->buf.index].queue, hw, 0); // Plan to release
 
-			bool has_read;
-			bool has_write;
-			bool has_error;
-			const int selected = us_device_select(stream->dev, &has_read, &has_write, &has_error);
-
-			if (selected < 0) {
-				if (errno != EINTR) {
-					US_LOG_PERROR("Mainloop select() error");
-					break;
-				}
-			} else if (selected == 0) { // Persistent timeout
-#				ifdef WITH_GPIO
-				us_gpio_set_stream_online(false);
-#				endif
-			} else {
-				if (has_read) {
-					US_LOG_DEBUG("Frame is ready");
-
-#					ifdef WITH_GPIO
-					us_gpio_set_stream_online(true);
-#					endif
-
-					const long double now = us_get_now_monotonic();
-					const long long now_second = us_floor_ms(now);
-
-					us_hw_buffer_s *hw;
-					const int buf_index = us_device_grab_buffer(stream->dev, &hw);
-
-					if (buf_index >= 0) {
-						if (now < grab_after) {
-							fluency_passed += 1;
-							US_LOG_VERBOSE("Passed %u frames for fluency: now=%.03Lf, grab_after=%.03Lf",
-								fluency_passed, now, grab_after);
-							if (us_device_release_buffer(stream->dev, hw) < 0) {
-								break;
-							}
-						} else {
-							fluency_passed = 0;
-
-							if (now_second != captured_fps_second) {
-								captured_fps = captured_fps_accum;
-								captured_fps_accum = 0;
-								captured_fps_second = now_second;
-								US_LOG_PERF_FPS("A new second has come; captured_fps=%u", captured_fps);
-							}
-							captured_fps_accum += 1;
-
-							const long double fluency_delay = us_workers_pool_get_fluency_delay(pool, ready_wr);
-							grab_after = now + fluency_delay;
-							US_LOG_VERBOSE("Fluency: delay=%.03Lf, grab_after=%.03Lf", fluency_delay, grab_after);
-
-							ready_job->hw = hw;
-							us_workers_pool_assign(pool, ready_wr);
-							US_LOG_DEBUG("Assigned new frame in buffer=%d to worker=%s", buf_index, ready_wr->name);
-
-							_SINK_PUT(raw_sink, &hw->raw);
-							_H264_PUT(&hw->raw, h264_force_key);
-						}
-					} else if (buf_index != -2) { // -2 for broken frame
-						break;
-					}
-				}
-
-				// Это условие было добавлено из параноидальных соображений, и мы ни разу не сталкивались
-				// с подобными ошибками, кроме случая с libcamerify, который генерит эвенты на запись.
-				// Судя по всему, игнорирование has_write не делает никому плохо.
-				/*if (has_write) {
-					US_LOG_ERROR("Got unexpected writing event, seems device was disconnected");
-					break;
-				}*/
-
-				if (has_error) {
-					US_LOG_INFO("Got V4L2 event");
-					if (us_device_consume_event(stream->dev) < 0) {
-						break;
-					}
+			// Мы не обновляем здесь состояние синков, потому что это происходит внутри обслуживающих их потоков
+			_stream_check_suicide(stream);
+			if (stream->slowdown && !_stream_has_any_clients_cached(stream)) {
+				usleep(100 * 1000);
+				slowdown_count = (slowdown_count + 1) % 10;
+				if (slowdown_count > 0) {
+					continue;
 				}
 			}
 		}
 
-		us_workers_pool_destroy(pool);
-		us_device_switch_capturing(stream->dev, false);
-		us_device_close(stream->dev);
+	close:
+		atomic_store(&threads_stop, true);
 
-#		ifdef WITH_GPIO
-		us_gpio_set_stream_online(false);
-#		endif
+		if (stream->raw_sink != NULL) {
+			US_THREAD_JOIN(raw_ctx.tid);
+			us_queue_destroy(raw_ctx.queue);
+		}
+
+		if (run->h264 != NULL) {
+			US_THREAD_JOIN(h264_ctx.tid);
+			us_queue_destroy(h264_ctx.queue);
+		}
+
+		US_THREAD_JOIN(jpeg_ctx.tid);
+		us_queue_destroy(jpeg_ctx.queue);
+
+		for (uint index = 0; index < n_releasers; ++index) {
+			US_THREAD_JOIN(releasers[index].tid);
+			us_queue_destroy(releasers[index].queue);
+		}
+		free(releasers);
+		US_MUTEX_DESTROY(release_mutex);
+
+		atomic_store(&threads_stop, false);
+
+		us_encoder_close(stream->enc);
+		us_device_close(dev);
+
+		if (!atomic_load(&run->stop)) {
+			US_SEP_INFO('=');
+		}
 	}
 
-	US_DELETE(_RUN(h264), us_h264_stream_destroy);
+	US_DELETE(run->h264, us_h264_stream_destroy);
 }
 
 void us_stream_loop_break(us_stream_s *stream) {
-	atomic_store(&_RUN(stop), true);
+	atomic_store(&stream->run->stop, true);
 }
 
-bool us_stream_has_clients(us_stream_s *stream) {
+void us_stream_get_capture_state(us_stream_s *stream, uint *width, uint *height, bool *online, uint *captured_fps) {
+	const u64 state = atomic_load(&stream->run->http_capture_state);
+	*width = state & 0xFFFF;
+	*height = (state >> 16) & 0xFFFF;
+	*captured_fps = (state >> 32) & 0xFFFF;
+	*online = (state >> 48) & 1;
+}
+
+void _stream_set_capture_state(us_stream_s *stream, uint width, uint height, bool online, uint captured_fps) {
+	const u64 state = (
+		(u64)(width & 0xFFFF)
+		| ((u64)(height & 0xFFFF) << 16)
+		| ((u64)(captured_fps & 0xFFFF) << 32)
+		| ((u64)(online ? 1 : 0) << 48)
+	);
+	atomic_store(&stream->run->http_capture_state, state);
+}
+
+static void *_releaser_thread(void *v_ctx) {
+	US_THREAD_SETTLE("str_rel")
+	_releaser_context_s *ctx = v_ctx;
+
+	while (!atomic_load(ctx->stop)) {
+		us_hw_buffer_s *hw;
+		if (us_queue_get(ctx->queue, (void**)&hw, 0.1) < 0) {
+			continue;
+		}
+
+		while (atomic_load(&hw->refs) > 0) {
+			if (atomic_load(ctx->stop)) {
+				goto done;
+			}
+			usleep(5 * 1000);
+		}
+
+		US_MUTEX_LOCK(*ctx->mutex);
+		const int released = us_device_release_buffer(ctx->dev, hw);
+		US_MUTEX_UNLOCK(*ctx->mutex);
+		if (released < 0) {
+			goto done;
+		}
+	}
+
+done:
+	atomic_store(ctx->stop, true); // Stop all other guys on error
+	return NULL;
+}
+
+static void *_jpeg_thread(void *v_ctx) {
+	US_THREAD_SETTLE("str_jpeg")
+	_worker_context_s *ctx = v_ctx;
+	us_stream_s *stream = ctx->stream;
+
+	ldf grab_after_ts = 0;
+	uint fluency_passed = 0;
+
+	while (!atomic_load(ctx->stop)) {
+		us_worker_s *const ready_wr = us_workers_pool_wait(stream->enc->run->pool);
+		us_encoder_job_s *const ready_job = ready_wr->job;
+
+		if (ready_job->hw != NULL) {
+			us_device_buffer_decref(ready_job->hw);
+			ready_job->hw = NULL;
+			if (ready_wr->job_failed) {
+				// pass
+			} else if (ready_wr->job_timely) {
+				_stream_expose_jpeg(stream, ready_job->dest);
+				if (atomic_load(&stream->run->http_snapshot_requested) > 0) { // Process real snapshots
+					atomic_fetch_sub(&stream->run->http_snapshot_requested, 1);
+				}
+				US_LOG_PERF("JPEG: ##### Encoded JPEG exposed; worker=%s, latency=%.3Lf",
+					ready_wr->name, us_get_now_monotonic() - ready_job->dest->grab_ts);
+			} else {
+				US_LOG_PERF("JPEG: ----- Encoded JPEG dropped; worker=%s", ready_wr->name);
+			}
+		}
+
+		us_hw_buffer_s *hw = _get_latest_hw(ctx->queue);
+		if (hw == NULL) {
+			continue;
+		}
+
+		const bool update_required = (stream->jpeg_sink != NULL && us_memsink_server_check(stream->jpeg_sink, NULL));
+		if (!update_required && !_stream_has_jpeg_clients_cached(stream)) {
+			US_LOG_VERBOSE("JPEG: Passed encoding because nobody is watching");
+			us_device_buffer_decref(hw);
+			continue;
+		}
+
+		const ldf now_ts = us_get_now_monotonic();
+		if (now_ts < grab_after_ts) {
+			fluency_passed += 1;
+			US_LOG_VERBOSE("JPEG: Passed %u frames for fluency: now=%.03Lf, grab_after=%.03Lf",
+				fluency_passed, now_ts, grab_after_ts);
+			us_device_buffer_decref(hw);
+			continue;
+		}
+		fluency_passed = 0;
+
+		const ldf fluency_delay = us_workers_pool_get_fluency_delay(stream->enc->run->pool, ready_wr);
+		grab_after_ts = now_ts + fluency_delay;
+		US_LOG_VERBOSE("JPEG: Fluency: delay=%.03Lf, grab_after=%.03Lf", fluency_delay, grab_after_ts);
+
+		ready_job->hw = hw;
+		us_workers_pool_assign(stream->enc->run->pool, ready_wr);
+		US_LOG_DEBUG("JPEG: Assigned new frame in buffer=%d to worker=%s", hw->buf.index, ready_wr->name);
+	}
+	return NULL;
+}
+
+static void *_h264_thread(void *v_ctx) {
+	US_THREAD_SETTLE("str_h264");
+	_worker_context_s *ctx = v_ctx;
+	us_h264_stream_s *h264 = ctx->stream->run->h264;
+
+	ldf grab_after_ts = 0;
+	ldf last_encode_ts = us_get_now_monotonic();
+
+	while (!atomic_load(ctx->stop)) {
+		us_hw_buffer_s *hw = _get_latest_hw(ctx->queue);
+		if (hw == NULL) {
+			continue;
+		}
+
+		if (!us_memsink_server_check(h264->sink, NULL)) {
+			us_device_buffer_decref(hw);
+			US_LOG_VERBOSE("H264: Passed encoding because nobody is watching");
+			continue;
+		}
+
+		if (hw->raw.grab_ts < grab_after_ts) {
+			us_device_buffer_decref(hw);
+			US_LOG_VERBOSE("H264: Passed encoding for FPS limit: %u", h264->enc->run->fps_limit);
+			continue;
+		}
+
+		// Форсим кейфрейм, если от захвата давно не было фреймов
+		const ldf now_ts = us_get_now_monotonic();
+		const bool force_key = (last_encode_ts + 0.5 < now_ts);
+		us_h264_stream_process(h264, &hw->raw, force_key);
+		last_encode_ts = now_ts;
+
+		// M2M-енкодер увеличивает задержку на 100 милисекунд при 1080p, если скормить ему больше 30 FPS.
+		// Поэтому у нас есть два режима: 60 FPS для маленьких видео и 30 для 1920x1080(1200).
+		// Следующй фрейм захватывается не раньше, чем это требуется по FPS, минус небольшая
+		// погрешность (если захват неравномерный) - немного меньше 1/60, и примерно треть от 1/30.
+		const ldf frame_interval = (ldf)1 / h264->enc->run->fps_limit;
+		grab_after_ts = hw->raw.grab_ts + frame_interval - 0.01;
+
+		us_device_buffer_decref(hw);
+	}
+	return NULL;
+}
+
+static void *_raw_thread(void *v_ctx) {
+	US_THREAD_SETTLE("str_raw");
+	_worker_context_s *ctx = v_ctx;
+
+	while (!atomic_load(ctx->stop)) {
+		us_hw_buffer_s *hw = _get_latest_hw(ctx->queue);
+		if (hw == NULL) {
+			continue;
+		}
+
+		if (!us_memsink_server_check(ctx->stream->raw_sink, NULL)) {
+			us_device_buffer_decref(hw);
+			US_LOG_VERBOSE("RAW: Passed publishing because nobody is watching");
+			continue;
+		}
+
+		us_memsink_server_put(ctx->stream->raw_sink, &hw->raw, false);
+		us_device_buffer_decref(hw);
+	}
+	return NULL;
+}
+
+static us_hw_buffer_s *_get_latest_hw(us_queue_s *queue) {
+	us_hw_buffer_s *hw;
+	if (us_queue_get(queue, (void**)&hw, 0.1) < 0) {
+		return NULL;
+	}
+	while (!us_queue_is_empty(queue)) { // Берем только самый свежий кадр
+		us_device_buffer_decref(hw);
+		assert(!us_queue_get(queue, (void**)&hw, 0));
+	}
+	return hw;
+}
+
+static bool _stream_has_jpeg_clients_cached(us_stream_s *stream) {
+	const us_stream_runtime_s *const run = stream->run;
 	return (
-		atomic_load(&_RUN(video->has_clients))
-		// has_clients синков НЕ обновляются в реальном времени
-		|| (stream->sink != NULL && atomic_load(&stream->sink->has_clients))
-		|| (_RUN(h264) != NULL && /*_RUN(h264->sink) == NULL ||*/ atomic_load(&_RUN(h264->sink->has_clients)))
+		atomic_load(&run->http_has_clients)
+		|| (atomic_load(&run->http_snapshot_requested) > 0)
+		|| (stream->jpeg_sink != NULL && atomic_load(&stream->jpeg_sink->has_clients))
 	);
 }
 
-static us_workers_pool_s *_stream_init_loop(us_stream_s *stream) {
+static bool _stream_has_any_clients_cached(us_stream_s *stream) {
+	const us_stream_runtime_s *const run = stream->run;
+	return (
+		_stream_has_jpeg_clients_cached(stream)
+		|| (run->h264 != NULL && atomic_load(&run->h264->sink->has_clients))
+		|| (stream->raw_sink != NULL && atomic_load(&stream->raw_sink->has_clients))
+	);
+}
 
-	us_workers_pool_s *pool = NULL;
-	int access_error = 0;
+static int _stream_init_loop(us_stream_s *stream) {
+	us_stream_runtime_s *const run = stream->run;
 
-	US_LOG_DEBUG("%s: stream->run->stop=%d", __FUNCTION__, atomic_load(&_RUN(stop)));
+	bool waiting_reported = false;
+	while (!atomic_load(&stream->run->stop)) {
+#		ifdef WITH_GPIO
+		us_gpio_set_stream_online(false);
+#		endif
 
-	while (!atomic_load(&_RUN(stop))) {
-		_stream_expose_frame(stream, NULL, 0);
+		// Флаги has_clients у синков не обновляются сами по себе, поэтому обновим их
+		// на каждой итерации старта стрима. После старта этим будут заниматься воркеры.
+		if (stream->jpeg_sink != NULL) {
+			us_memsink_server_check(stream->jpeg_sink, NULL);
+		}
+		if (stream->run->h264 != NULL) {
+			us_memsink_server_check(stream->run->h264->sink, NULL);
+		}
+		if (stream->raw_sink != NULL) {
+			us_memsink_server_check(stream->raw_sink, NULL);
+		}
 
-		if (access(stream->dev->path, R_OK|W_OK) < 0) {
-			if (access_error != errno) {
-				US_SEP_INFO('=');
-				US_LOG_PERROR("Can't access device");
-				US_LOG_INFO("Waiting for the device access ...");
-				access_error = errno;
+		_stream_check_suicide(stream);
+
+		stream->dev->dma_export = (
+			stream->enc->type == US_ENCODER_TYPE_M2M_VIDEO
+			|| stream->enc->type == US_ENCODER_TYPE_M2M_IMAGE
+			|| run->h264 != NULL
+		);
+		switch (us_device_open(stream->dev)) {
+			case -2:
+				if (!waiting_reported) {
+					waiting_reported = true;
+					US_LOG_INFO("Waiting for the capture device ...");
+				}
+				goto offline_and_retry;
+			case -1:
+				waiting_reported = false;
+				goto offline_and_retry;
+			default: break;
+		}
+		us_encoder_open(stream->enc, stream->dev);
+		return 0;
+
+	offline_and_retry:
+		for (uint count = 0; count < stream->error_delay * 10; ++count) {
+			if (atomic_load(&run->stop)) {
+				break;
 			}
-			sleep(stream->error_delay);
-			continue;
-		} else {
-			US_SEP_INFO('=');
-			access_error = 0;
-		}
+			if (count % 10 == 0) {
+				// Каждую секунду повторяем blank
+				uint width = stream->dev->run->width;
+				uint height = stream->dev->run->height;
+				if (width == 0 || height == 0) {
+					width = stream->dev->width;
+					height = stream->dev->height;
+				}
+				us_blank_draw(run->blank, "< NO SIGNAL >", width, height);
 
-		if ((pool = _stream_init_one(stream)) == NULL) {
-			US_LOG_INFO("Sleeping %u seconds before new stream init ...", stream->error_delay);
-			sleep(stream->error_delay);
-		} else {
-			break;
-		}
-	}
-	return pool;
-}
+				_stream_set_capture_state(stream, width, height, false, 0);
 
-static us_workers_pool_s *_stream_init_one(us_stream_s *stream) {
-	if (us_device_open(stream->dev) < 0) {
-		goto error;
-	}
-	if (
-		stream->enc->type == US_ENCODER_TYPE_M2M_VIDEO
-		|| stream->enc->type == US_ENCODER_TYPE_M2M_IMAGE
-		|| (_RUN(h264) && !us_is_jpeg(stream->dev->run->format))
-	) {
-		us_device_export_to_dma(stream->dev);
-	}
-	if (us_device_switch_capturing(stream->dev, true) < 0) {
-		goto error;
-	}
-	return us_encoder_workers_pool_init(stream->enc, stream->dev);
-	error:
-		us_device_close(stream->dev);
-		return NULL;
-}
-
-static void _stream_expose_frame(us_stream_s *stream, us_frame_s *frame, unsigned captured_fps) {
-#	define VID(x_next) _RUN(video->x_next)
-
-	us_frame_s *new = NULL;
-
-	US_MUTEX_LOCK(VID(mutex));
-
-	if (frame != NULL) {
-		new = frame;
-		_RUN(last_as_blank_ts) = 0; // Останавливаем таймер
-		US_LOG_DEBUG("Exposed ALIVE video frame");
-
-	} else {
-		if (VID(frame->used == 0)) {
-			new = stream->blank; // Инициализация
-			_RUN(last_as_blank_ts) = 0;
-
-		} else if (VID(frame->online)) { // Если переходим из online в offline
-			if (stream->last_as_blank < 0) { // Если last_as_blank выключен, просто покажем старую картинку
-				new = stream->blank;
-				US_LOG_INFO("Changed video frame to BLANK");
-			} else if (stream->last_as_blank > 0) { // // Если нужен таймер - запустим
-				_RUN(last_as_blank_ts) = us_get_now_monotonic() + stream->last_as_blank;
-				US_LOG_INFO("Freezed last ALIVE video frame for %d seconds", stream->last_as_blank);
-			} else {  // last_as_blank == 0 - показываем последний фрейм вечно
-				US_LOG_INFO("Freezed last ALIVE video frame forever");
+				_stream_expose_jpeg(stream, run->blank->jpeg);
+				if (run->h264 != NULL) {
+					us_h264_stream_process(run->h264, run->blank->raw, true);
+				}
+				_stream_expose_raw(stream, run->blank->raw);
 			}
-
-		} else if (stream->last_as_blank < 0) {
-			new = stream->blank;
-			// US_LOG_INFO("Changed video frame to BLANK");
-		}
-
-		if ( // Если уже оффлайн, включена фича last_as_blank с таймером и он запущен
-			stream->last_as_blank > 0
-			&& _RUN(last_as_blank_ts) != 0
-			&& _RUN(last_as_blank_ts) < us_get_now_monotonic()
-		) {
-			new = stream->blank;
-			_RUN(last_as_blank_ts) = 0; // // Останавливаем таймер
-			US_LOG_INFO("Changed last ALIVE video frame to BLANK");
+			usleep(100 * 1000);
 		}
 	}
-
-	if (new != NULL) {
-		us_frame_copy(new, VID(frame));
-	}
-	VID(frame->online) = (frame != NULL);
-	VID(captured_fps) = captured_fps;
-	atomic_store(&VID(updated), true);
-
-	US_MUTEX_UNLOCK(VID(mutex));
-
-	new = (frame ? frame : stream->blank);
-	_SINK_PUT(sink, new);
-
-	if (frame == NULL) {
-		_SINK_PUT(raw_sink, stream->blank);
-		_H264_PUT(stream->blank, false);
-	}
-
-#	undef VID
+	return -1;
+}
+
+static void _stream_expose_jpeg(us_stream_s *stream, const us_frame_s *frame) {
+	us_stream_runtime_s *const run = stream->run;
+	int ri;
+	while ((ri = us_ring_producer_acquire(run->http_jpeg_ring, 0)) < 0) {
+		if (atomic_load(&run->stop)) {
+			return;
+		}
+	}
+	us_frame_s *const dest = run->http_jpeg_ring->items[ri];
+	us_frame_copy(frame, dest);
+	us_ring_producer_release(run->http_jpeg_ring, ri);
+	if (stream->jpeg_sink != NULL) {
+		us_memsink_server_put(stream->jpeg_sink, dest, NULL);
+	}
+}
+
+static void _stream_expose_raw(us_stream_s *stream, const us_frame_s *frame) {
+	if (stream->raw_sink != NULL) {
+		us_memsink_server_put(stream->raw_sink, frame, NULL);
+	}
+}
+
+static void _stream_check_suicide(us_stream_s *stream) {
+	if (stream->exit_on_no_clients == 0) {
+		return;
+	}
+	us_stream_runtime_s *const run = stream->run;
+	const ldf now_ts = us_get_now_monotonic();
+	const ull http_last_request_ts = atomic_load(&run->http_last_request_ts); // Seconds
+	if (_stream_has_any_clients_cached(stream)) {
+		atomic_store(&run->http_last_request_ts, now_ts);
+	} else if (http_last_request_ts + stream->exit_on_no_clients < now_ts) {
+		US_LOG_INFO("No requests or HTTP/sink clients found in last %u seconds, exiting ...",
+			stream->exit_on_no_clients);
+		us_process_suicide();
+		atomic_store(&run->http_last_request_ts, now_ts);
+	}
 }

src/ustreamer/stream.h

@@ -22,47 +22,32 @@
 
 #pragma once
 
-#include <stdlib.h>
-#include <stdbool.h>
 #include <stdatomic.h>
-#include <unistd.h>
-#include <errno.h>
-#include <assert.h>
 
 #include <pthread.h>
-#include <linux/videodev2.h>
 
-#include "../libs/tools.h"
-#include "../libs/threading.h"
-#include "../libs/logging.h"
-#include "../libs/frame.h"
+#include "../libs/types.h"
+#include "../libs/queue.h"
+#include "../libs/ring.h"
 #include "../libs/memsink.h"
 #include "../libs/device.h"
 
 #include "blank.h"
 #include "encoder.h"
-#include "workers.h"
 #include "h264.h"
-#ifdef WITH_GPIO
-#	include "gpio/gpio.h"
-#endif
 
 
 typedef struct {
-	us_frame_s		*frame;
-	unsigned		captured_fps;
-	atomic_bool		updated;
-	pthread_mutex_t	mutex;
-
-	atomic_bool		has_clients; // For slowdown
-} us_video_s;
-
-typedef struct {
-	us_video_s		*video;
-	long double		last_as_blank_ts;
-
 	us_h264_stream_s	*h264;
 
+	us_ring_s		*http_jpeg_ring;
+	atomic_bool		http_has_clients;
+	atomic_uint		http_snapshot_requested;
+	atomic_ullong	http_last_request_ts; // Seconds
+	atomic_ullong	http_capture_state; // Bits
+
+	us_blank_s		*blank;
+
 	atomic_bool		stop;
 } us_stream_runtime_s;
 
@@ -70,17 +55,17 @@ typedef struct {
 	us_device_s		*dev;
 	us_encoder_s	*enc;
 
-	us_frame_s		*blank;
 	int				last_as_blank;
 	bool			slowdown;
-	unsigned		error_delay;
+	uint			error_delay;
+	uint			exit_on_no_clients;
 
-	us_memsink_s	*sink;
+	us_memsink_s	*jpeg_sink;
 	us_memsink_s	*raw_sink;
 
 	us_memsink_s	*h264_sink;
-	unsigned		h264_bitrate;
-	unsigned		h264_gop;
+	uint			h264_bitrate;
+	uint			h264_gop;
 	char			*h264_m2m_path;
 
 	us_stream_runtime_s	*run;
@@ -93,4 +78,4 @@ void us_stream_destroy(us_stream_s *stream);
 void us_stream_loop(us_stream_s *stream);
 void us_stream_loop_break(us_stream_s *stream);
 
-bool us_stream_has_clients(us_stream_s *stream);
+void us_stream_get_capture_state(us_stream_s *stream, uint *width, uint *height, bool *online, uint *captured_fps);

src/ustreamer/workers.c

@@ -178,7 +178,7 @@ long double us_workers_pool_get_fluency_delay(us_workers_pool_s *pool, const us_
 static void *_worker_thread(void *v_worker) {
 	us_worker_s *wr = (us_worker_s *)v_worker;
 
-	US_THREAD_RENAME("%s", wr->name);
+	US_THREAD_SETTLE("%s", wr->name);
 	US_LOG_DEBUG("Hello! I am a worker %s ^_^", wr->name);
 
 	while (!atomic_load(&wr->pool->stop)) {

src/v4p/drm.c

@@ -27,6 +27,10 @@
 #include <fcntl.h>
 
 #include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+
+#include <linux/videodev2.h>
 
 #include <xf86drm.h>
 #include <xf86drmMode.h>
@@ -37,18 +41,17 @@
 #include "../libs/tools.h"
 #include "../libs/logging.h"
 #include "../libs/frame.h"
-
-#include "ftext.h"
+#include "../libs/frametext.h"
 
 
-static void _drm_vsync_callback(int fd, uint n_frame, uint sec, uint usec, void *v_run);
-static int _drm_expose_raw(us_drm_s *drm, const us_frame_s *frame);
-static void _drm_cleanup(us_drm_s *drm);
-static void _drm_ensure(us_drm_s *drm, const us_frame_s *frame, float hz);
-static int _drm_init_video(us_drm_s *drm);
-static int _drm_init_buffers(us_drm_s *drm);
+static void _drm_vsync_callback(int fd, uint n_frame, uint sec, uint usec, void *v_buf);
+static int _drm_check_status(us_drm_s *drm);
+static void _drm_ensure_dpms_power(us_drm_s *drm, bool on);
+static int _drm_init_buffers(us_drm_s *drm, const us_device_s *dev);
 static int _drm_find_sink(us_drm_s *drm, uint width, uint height, float hz);
 
+static drmModeModeInfo *_find_best_mode(drmModeConnector *conn, uint width, uint height, float hz);
+static u32 _find_dpms(int fd, drmModeConnector *conn);
 static u32 _find_crtc(int fd, drmModeRes *res, drmModeConnector *conn, u32 *taken_crtcs);
 static const char *_connector_type_to_string(u32 type);
 static float _get_refresh_rate(const drmModeModeInfo *mode);
@@ -65,35 +68,204 @@ us_drm_s *us_drm_init(void) {
 	us_drm_runtime_s *run;
 	US_CALLOC(run, 1);
 	run->fd = -1;
-	run->conn_type = -1;
-	run->conn_type_id = -1;
-	run->ft = us_ftext_init();
-	run->state = US_DRM_STATE_CLOSED;
+	run->status_fd = -1;
+	run->dpms_state = -1;
+	run->has_vsync = true;
+	run->exposing_dma_fd = -1;
+	run->ft = us_frametext_init();
 
 	us_drm_s *drm;
 	US_CALLOC(drm, 1);
-	drm->path = "/dev/dri/card0";
+	// drm->path = "/dev/dri/card0";
+	drm->path = "/dev/dri/by-path/platform-gpu-card";
 	drm->port = "HDMI-A-1";
-	drm->n_bufs = 4;
 	drm->timeout = 5;
 	drm->run = run;
 	return drm;
 }
 
 void us_drm_destroy(us_drm_s *drm) {
-	_drm_cleanup(drm);
-	us_ftext_destroy(drm->run->ft);
+	us_frametext_destroy(drm->run->ft);
 	US_DELETE(drm->run, free);
 	US_DELETE(drm, free); // cppcheck-suppress uselessAssignmentPtrArg
 }
 
+int us_drm_open(us_drm_s *drm, const us_device_s *dev) {
+	us_drm_runtime_s *const run = drm->run;
+
+	assert(run->fd < 0);
+
+	switch (_drm_check_status(drm)) {
+		case 0: break;
+		case -2: goto unplugged;
+		default: goto error;
+	}
+
+	_D_LOG_INFO("Configuring DRM device for %s ...", (dev == NULL ? "STUB" : "DMA"));
+
+	if ((run->fd = open(drm->path, O_RDWR | O_CLOEXEC | O_NONBLOCK)) < 0) {
+		_D_LOG_PERROR("Can't open DRM device");
+		goto error;
+	}
+	_D_LOG_DEBUG("DRM device fd=%d opened", run->fd);
+
+	int stub = 0; // Open the real device with DMA
+	if (dev == NULL) {
+		stub = US_DRM_STUB_USER;
+	} else if (dev->run->format != V4L2_PIX_FMT_RGB24) {
+		stub = US_DRM_STUB_BAD_FORMAT;
+		char fourcc_str[8];
+		us_fourcc_to_string(dev->run->format, fourcc_str, 8);
+		_D_LOG_ERROR("Input format %s is not supported, forcing to STUB ...", fourcc_str);
+	}
+
+#	define CHECK_CAP(x_cap) { \
+			_D_LOG_DEBUG("Checking %s ...", #x_cap); \
+			u64 m_check; \
+			if (drmGetCap(run->fd, x_cap, &m_check) < 0) { \
+				_D_LOG_PERROR("Can't check " #x_cap); \
+				goto error; \
+			} \
+			if (!m_check) { \
+				_D_LOG_ERROR(#x_cap " is not supported"); \
+				goto error; \
+			} \
+		}
+	CHECK_CAP(DRM_CAP_DUMB_BUFFER);
+	if (stub == 0) {
+		CHECK_CAP(DRM_CAP_PRIME);
+	}
+#	undef CHECK_CAP
+
+	const uint width = (stub > 0 ? 0 : dev->run->width);
+	const uint height = (stub > 0 ? 0 : dev->run->height);
+	const uint hz = (stub > 0 ? 0 : dev->run->hz);
+	switch (_drm_find_sink(drm, width, height, hz)) {
+		case 0: break;
+		case -2: goto unplugged;
+		default: goto error;
+	}
+	if ((stub == 0) && (width != run->mode.hdisplay || height < run->mode.vdisplay)) {
+		// We'll try to show something instead of nothing if height != vdisplay
+		stub = US_DRM_STUB_BAD_RESOLUTION;
+		_D_LOG_ERROR("There is no appropriate modes for the capture, forcing to STUB ...");
+	}
+
+	if (_drm_init_buffers(drm, (stub > 0 ? NULL : dev)) < 0) {
+		goto error;
+	}
+
+	run->saved_crtc = drmModeGetCrtc(run->fd, run->crtc_id);
+	_D_LOG_DEBUG("Setting up CRTC ...");
+	if (drmModeSetCrtc(run->fd, run->crtc_id, run->bufs[0].id, 0, 0, &run->conn_id, 1, &run->mode) < 0) {
+		_D_LOG_PERROR("Can't set CRTC");
+		goto error;
+	}
+
+	run->opened_for_stub = (stub > 0);
+	run->exposing_dma_fd = -1;
+	run->unplugged_reported = false;
+	_D_LOG_INFO("Opened for %s ...", (run->opened_for_stub ? "STUB" : "DMA"));
+	return stub;
+
+error:
+	us_drm_close(drm);
+	return -1;
+
+unplugged:
+	if (!run->unplugged_reported) {
+		_D_LOG_ERROR("Display is not plugged");
+		run->unplugged_reported = true;
+	}
+	us_drm_close(drm);
+	return -2;
+}
+
+void us_drm_close(us_drm_s *drm) {
+	us_drm_runtime_s *const run = drm->run;
+
+	if (run->exposing_dma_fd >= 0) {
+		// Нужно подождать, пока dma_fd не освободится, прежде чем прерывать процесс.
+		// Просто на всякий случай.
+		assert(run->fd >= 0);
+		us_drm_wait_for_vsync(drm);
+		run->exposing_dma_fd = -1;
+	}
+
+	if (run->saved_crtc != NULL) {
+		_D_LOG_DEBUG("Restoring CRTC ...");
+		if (drmModeSetCrtc(run->fd,
+			run->saved_crtc->crtc_id, run->saved_crtc->buffer_id,
+			run->saved_crtc->x, run->saved_crtc->y,
+			&run->conn_id, 1, &run->saved_crtc->mode
+		) < 0 && errno != ENOENT) {
+			_D_LOG_PERROR("Can't restore CRTC");
+		}
+		drmModeFreeCrtc(run->saved_crtc);
+		run->saved_crtc = NULL;
+	}
+
+	if (run->bufs != NULL) {
+		_D_LOG_DEBUG("Releasing buffers ...");
+		for (uint n_buf = 0; n_buf < run->n_bufs; ++n_buf) {
+			us_drm_buffer_s *const buf = &run->bufs[n_buf];
+			if (buf->fb_added && drmModeRmFB(run->fd, buf->id) < 0) {
+				_D_LOG_PERROR("Can't remove buffer=%u", n_buf);
+			}
+			if (buf->dumb_created) {
+				struct drm_mode_destroy_dumb destroy = {.handle = buf->handle};
+				if (drmIoctl(run->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy) < 0) {
+					_D_LOG_PERROR("Can't destroy dumb buffer=%u", n_buf);
+				}
+			}
+			if (buf->data != NULL && munmap(buf->data, buf->allocated)) {
+				_D_LOG_PERROR("Can't unmap buffer=%u", n_buf);
+			}
+		}
+		US_DELETE(run->bufs, free);
+		run->n_bufs = 0;
+	}
+
+	const bool say = (run->fd >= 0);
+	US_CLOSE_FD(run->status_fd);
+	US_CLOSE_FD(run->fd);
+
+	run->crtc_id = 0;
+	run->dpms_state = -1;
+	run->has_vsync = true;
+	run->stub_n_buf = 0;
+
+	if (say) {
+		_D_LOG_INFO("Closed");
+	}
+}
+
+int us_drm_dpms_power_off(us_drm_s *drm) {
+	assert(drm->run->fd >= 0);
+	switch (_drm_check_status(drm)) {
+		case 0: break;
+		case -2: return 0; // Unplugged, nice
+		// Во время переключения DPMS монитор моргает один раз состоянием disconnected,
+		// а потом почему-то снова оказывается connected. Так что просто считаем,
+		// что отсоединенный монитор на этом этапе - это нормально.
+		default: return -1;
+	}
+	_drm_ensure_dpms_power(drm, false);
+	return 0;
+}
+
 int us_drm_wait_for_vsync(us_drm_s *drm) {
 	us_drm_runtime_s *const run = drm->run;
 
-	_drm_ensure(drm, NULL, 0);
-	if (run->state != US_DRM_STATE_OK) {
-		return -1;
+	assert(run->fd >= 0);
+
+	switch (_drm_check_status(drm)) {
+		case 0: break;
+		case -2: return -2;
+		default: return -1;
 	}
+	_drm_ensure_dpms_power(drm, true);
+
 	if (run->has_vsync) {
 		return 0;
 	}
@@ -107,10 +279,10 @@ int us_drm_wait_for_vsync(us_drm_s *drm) {
 	const int result = select(run->fd + 1, &fds, NULL, NULL, &timeout);
 	if (result < 0) {
 		_D_LOG_PERROR("Can't select(%d) device for VSync", run->fd);
-		goto error;
+		return -1;
 	} else if (result == 0) {
 		_D_LOG_ERROR("Device timeout while waiting VSync");
-		goto error;
+		return -1;
 	}
 
 	drmEventContext ctx = {
@@ -120,294 +292,234 @@ int us_drm_wait_for_vsync(us_drm_s *drm) {
 	_D_LOG_DEBUG("Handling DRM event (maybe VSync) ...");
 	if (drmHandleEvent(run->fd, &ctx) < 0) {
 		_D_LOG_PERROR("Can't handle DRM event");
-		goto error;
-	}
-	return 0;
-
-error:
-	_drm_cleanup(drm);
-	_D_LOG_ERROR("Device destroyed due an error (vsync)");
-	return -1;
-}
-
-int us_drm_expose(us_drm_s *drm, us_drm_expose_e ex, const us_frame_s *frame, float hz) {
-	us_drm_runtime_s *const run = drm->run;
-
-	_drm_ensure(drm, frame, hz);
-	if (run->state != US_DRM_STATE_OK) {
 		return -1;
 	}
-
-	const drmModeModeInfo *const mode = &run->mode;
-	bool msg_drawn = false;
-
-#	define DRAW_MSG(x_msg) { \
-			us_ftext_draw(run->ft, (x_msg), mode->hdisplay, mode->vdisplay); \
-			frame = run->ft->frame; \
-			msg_drawn = true; \
-		}
-
-	if (frame == NULL) {
-		switch (ex) {
-			case US_DRM_EXPOSE_NO_SIGNAL:
-				DRAW_MSG("=== PiKVM ===\n \n< NO SIGNAL >");
-				break;
-			case US_DRM_EXPOSE_BUSY:
-				DRAW_MSG("=== PiKVM ===\n \n< ONLINE IS ACTIVE >");
-				break;
-			default:
-				DRAW_MSG("=== PiKVM ===\n \n< ??? >");
-		}
-	} else if (mode->hdisplay != frame->width/* || mode->vdisplay != frame->height*/) {
-		// XXX: At least we'll try to show something instead of nothing ^^^
-		char msg[1024];
-		US_SNPRINTF(msg, 1023,
-			"=== PiKVM ==="
-			"\n \n< UNSUPPORTED RESOLUTION >"
-			"\n \n< %ux%up%.02f >"
-			"\n \nby this display",
-			frame->width, frame->height, hz);
-		DRAW_MSG(msg);
-	} else if (frame->format != V4L2_PIX_FMT_RGB24) {
-		DRAW_MSG(
-			"=== PiKVM ==="
-			"\n \n< UNSUPPORTED CAPTURE FORMAT >"
-			"\n \nIt shouldn't happen ever."
-			"\n \nPlease check the logs and report a bug:"
-			"\n \n- https://github.com/pikvm/pikvm -");
-	}
-
-#	undef DRAW_MSG
-
-	if (_drm_expose_raw(drm, frame) < 0) {
-		_drm_cleanup(drm);
-		_D_LOG_ERROR("Device destroyed due an error (expose)");
-	}
-	return (msg_drawn ? -1 : 0);
+	return 0;
 }
 
-static void _drm_vsync_callback(int fd, uint n_frame, uint sec, uint usec, void *v_run) {
+static void _drm_vsync_callback(int fd, uint n_frame, uint sec, uint usec, void *v_buf) {
 	(void)fd;
 	(void)n_frame;
 	(void)sec;
 	(void)usec;
-	us_drm_runtime_s *const run = v_run;
-	run->has_vsync = true;
+	us_drm_buffer_s *const buf = v_buf;
+	*buf->ctx.has_vsync = true;
+	*buf->ctx.exposing_dma_fd = -1;
 	_D_LOG_DEBUG("Got VSync signal");
 }
 
-static int _drm_expose_raw(us_drm_s *drm, const us_frame_s *frame) {
+int us_drm_expose_stub(us_drm_s *drm, us_drm_stub_e stub, const us_device_s *dev) {
 	us_drm_runtime_s *const run = drm->run;
-	us_drm_buffer_s *const buf = &run->bufs[run->next_n_buf];
 
-	_D_LOG_DEBUG("Exposing%s framebuffer n_buf=%u, vsync=%d ...",
-		(frame == NULL ? " EMPTY" : ""), run->next_n_buf, run->has_vsync);
+	assert(run->fd >= 0);
+	assert(run->opened_for_stub);
+
+	switch (_drm_check_status(drm)) {
+		case 0: break;
+		case -2: return -2;
+		default: return -1;
+	}
+	_drm_ensure_dpms_power(drm, true);
+
+#	define DRAW_MSG(x_msg) us_frametext_draw(run->ft, (x_msg), run->mode.hdisplay, run->mode.vdisplay)
+	switch (stub) {
+		case US_DRM_STUB_BAD_RESOLUTION: {
+			assert(dev != NULL);
+			char msg[1024];
+			US_SNPRINTF(msg, 1023,
+				"=== PiKVM ==="
+				"\n \n< UNSUPPORTED RESOLUTION >"
+				"\n \n< %ux%up%.02f >"
+				"\n \nby this display",
+				dev->run->width, dev->run->height, dev->run->hz);
+			DRAW_MSG(msg);
+			break;
+		};
+		case US_DRM_STUB_BAD_FORMAT:
+			DRAW_MSG(
+				"=== PiKVM ==="
+				"\n \n< UNSUPPORTED CAPTURE FORMAT >"
+				"\n \nIt shouldn't happen ever."
+				"\n \nPlease check the logs and report a bug:"
+				"\n \n- https://github.com/pikvm/pikvm -");
+			break;
+		case US_DRM_STUB_NO_SIGNAL:
+			DRAW_MSG("=== PiKVM ===\n \n< NO SIGNAL >");
+			break;
+		case US_DRM_STUB_BUSY:
+			DRAW_MSG("=== PiKVM ===\n \n< ONLINE IS ACTIVE >");
+			break;
+		default:
+			DRAW_MSG("=== PiKVM ===\n \n< ??? >");
+			break;
+	}
+#	undef DRAW_MSG
+
+	us_drm_buffer_s *const buf = &run->bufs[run->stub_n_buf];
 
 	run->has_vsync = false;
 
-	if (frame == NULL) {
-		memset(buf->data, 0, buf->allocated);
-	} else {
-		memcpy(buf->data, frame->data, US_MIN(frame->used, buf->allocated));
-	}
+	_D_LOG_DEBUG("Copying STUB frame ...")
+	memcpy(buf->data, run->ft->frame->data, US_MIN(run->ft->frame->used, buf->allocated));
 
+	_D_LOG_DEBUG("Exposing STUB framebuffer n_buf=%u ...", run->stub_n_buf);
 	const int retval = drmModePageFlip(
-			run->fd, run->crtc_id, buf->id,
-			DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_PAGE_FLIP_ASYNC,
-			run);
-	if (retval == 0) {
-		run->next_n_buf = (run->next_n_buf + 1) % run->n_bufs;
+		run->fd, run->crtc_id, buf->id,
+		DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_PAGE_FLIP_ASYNC,
+		buf);
+	if (retval < 0) {
+		_D_LOG_PERROR("Can't expose STUB framebuffer n_buf=%u ...", run->stub_n_buf);
 	}
+	_D_LOG_DEBUG("Exposed STUB framebuffer n_buf=%u", run->stub_n_buf);
+
+	run->stub_n_buf = (run->stub_n_buf + 1) % run->n_bufs;
 	return retval;
 }
 
-static void _drm_cleanup(us_drm_s *drm) {
+int us_drm_expose_dma(us_drm_s *drm, const us_hw_buffer_s *hw) {
 	us_drm_runtime_s *const run = drm->run;
+	us_drm_buffer_s *const buf = &run->bufs[hw->buf.index];
 
-	_D_LOG_DEBUG("Cleaning up ...");
+	assert(run->fd >= 0);
+	assert(!run->opened_for_stub);
 
-	if (run->saved_crtc != NULL) {
-		if (drmModeSetCrtc(run->fd,
-			run->saved_crtc->crtc_id, run->saved_crtc->buffer_id,
-			run->saved_crtc->x, run->saved_crtc->y,
-			&run->conn_id, 1, &run->saved_crtc->mode
-		) < 0) {
-			_D_LOG_PERROR("Can't restore CRTC");
-		}
-		drmModeFreeCrtc(run->saved_crtc);
-		run->saved_crtc = NULL;
+	switch (_drm_check_status(drm)) {
+		case 0: break;
+		case -2: return -2;
+		default: return -1;
 	}
+	_drm_ensure_dpms_power(drm, true);
 
-	if (run->bufs != NULL) {
-		for (uint n_buf = 0; n_buf < run->n_bufs; ++n_buf) {
-			us_drm_buffer_s *const buf = &run->bufs[n_buf];
-			if (buf->data != NULL && munmap(buf->data, buf->allocated)) {
-				_D_LOG_PERROR("Can't unmap buffer=%u", n_buf);
-			}
-			if (buf->fb_added && drmModeRmFB(run->fd, buf->id) < 0) {
-				_D_LOG_PERROR("Can't remove buffer=%u", n_buf);
-			}
-			if (buf->dumb_created) {
-				struct drm_mode_destroy_dumb destroy = {.handle = buf->handle};
-				if (drmIoctl(run->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy) < 0) {
-					_D_LOG_PERROR("Can't destroy dumb buffer=%u", n_buf);
-				}
-			}
-		}
-		US_DELETE(run->bufs, free);
-		run->n_bufs = 0;
-	}
-
-	if (run->fd >= 0) {
-		if (close(run->fd) < 0) {
-			_D_LOG_PERROR("Can't close device");
-		}
-		run->fd = -1;
-	}
-
-	run->crtc_id = 0;
-	run->next_n_buf = 0;
 	run->has_vsync = false;
 
-	if (run->state == US_DRM_STATE_OK) {
-		_D_LOG_INFO("Stopped");
-		run->state = US_DRM_STATE_CLOSED;
+	_D_LOG_DEBUG("Exposing DMA framebuffer n_buf=%u ...", hw->buf.index);
+	const int retval = drmModePageFlip(
+		run->fd, run->crtc_id, buf->id,
+		DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_PAGE_FLIP_ASYNC,
+		buf);
+	if (retval < 0) {
+		_D_LOG_PERROR("Can't expose DMA framebuffer n_buf=%u ...", run->stub_n_buf);
 	}
+	_D_LOG_DEBUG("Exposed DMA framebuffer n_buf=%u", run->stub_n_buf);
+	run->exposing_dma_fd = hw->dma_fd;
+	return retval;
 }
 
-static void _drm_ensure(us_drm_s *drm, const us_frame_s *frame, float hz) {
-	us_drm_runtime_s *const run = drm->run;
+static int _drm_check_status(us_drm_s *drm) {
+	us_drm_runtime_s *run = drm->run;
 
-	if (frame == NULL) {
-		if (run->state == US_DRM_STATE_OK) {
-			return;
+	if (run->status_fd < 0) {
+		_D_LOG_DEBUG("Trying to find status file ...");
+		struct stat st;
+		if (stat(drm->path, &st) < 0) {
+			_D_LOG_PERROR("Can't stat() DRM device");
+			goto error;
 		}
-	} else {
-		if (
-			run->p_width == frame->width
-			&& run->p_height == frame->height
-			&& run->p_hz == hz
-			&& run->state <= US_DRM_STATE_RETRY
-		) {
-			return;
+		const uint mi = minor(st.st_rdev);
+		_D_LOG_DEBUG("DRM device minor(st_rdev)=%u", mi);
+
+		char path[128];
+		US_SNPRINTF(path, 127, "/sys/class/drm/card%u-%s/status", mi, drm->port);
+		_D_LOG_DEBUG("Opening status file %s ...", path);
+		if ((run->status_fd = open(path, O_RDONLY | O_CLOEXEC)) < 0) {
+			_D_LOG_PERROR("Can't open status file: %s", path);
+			goto error;
 		}
+		_D_LOG_DEBUG("Status file fd=%d opened", run->status_fd);
 	}
 
-	_drm_cleanup(drm);
-
-	if (run->state <= US_DRM_STATE_RETRY) {
-		_D_LOG_INFO("Configuring DRM device ...");
-	}
-
-	if (frame == NULL) {
-		run->p_width = 0; // Find the native resolution
-		run->p_height = 0;
-	} else {
-		run->p_width = frame->width;
-		run->p_height = frame->height;
-	}
-	run->p_hz = hz;
-
-	if ((run->fd = open(drm->path, O_RDWR|O_CLOEXEC|O_NONBLOCK)) < 0) {
-		_D_LOG_PERROR("Can't open DRM device");
+	char status_ch;
+	if (read(run->status_fd, &status_ch, 1) != 1) {
+		_D_LOG_PERROR("Can't read status file");
 		goto error;
 	}
-
-#	define CHECK_CAP(x_cap) { \
-			u64 m_check; \
-			if (drmGetCap(run->fd, x_cap, &m_check) < 0) { \
-				_D_LOG_PERROR("Can't check " #x_cap); \
-				goto error; \
-			} \
-			if (!m_check) { \
-				_D_LOG_ERROR(#x_cap " is not supported"); \
-				goto error; \
-			} \
-		}
-	CHECK_CAP(DRM_CAP_DUMB_BUFFER);
-	// CHECK_CAP(DRM_CAP_PRIME);
-#	undef CHECK_CAP
-
-	if (_drm_find_sink(drm, run->p_width, run->p_height, run->p_hz) < 0) {
+	if (lseek(run->status_fd, 0, SEEK_SET) != 0) {
+		_D_LOG_PERROR("Can't rewind status file");
 		goto error;
 	}
-
-	if (run->crtc_id == 0) {
-		if (run->state != US_DRM_STATE_NO_DISPLAY) {
-			_D_LOG_INFO("Using %s mode: Display unplugged", drm->port);
-			run->state = US_DRM_STATE_NO_DISPLAY;
-		}
-		goto error;
-	} else {
-		const float mode_hz = _get_refresh_rate(&run->mode);
-		if (frame == NULL) {
-			run->p_width = run->mode.hdisplay;
-			run->p_height = run->mode.vdisplay;
-			run->p_hz = mode_hz;
-		}
-		_D_LOG_INFO("Using %s mode: %ux%up%.02f",
-			drm->port, run->mode.hdisplay, run->mode.vdisplay, mode_hz);
-	}
-
-	if (_drm_init_buffers(drm) < 0) {
-		goto error;
-	}
-
-	if (_drm_init_video(drm) < 0) {
-		goto error;
-	}
-
-	_D_LOG_INFO("Showing ...");
-	run->state = US_DRM_STATE_OK;
-	return;
+	_D_LOG_DEBUG("Current display status: %c", status_ch);
+	return (status_ch == 'd' ? -2 : 0);
 
 error:
-	if (run->state == US_DRM_STATE_CLOSED) {
-		_D_LOG_ERROR("Device destroyed due an error (prepare)");
-	}
-	_drm_cleanup(drm);
+	US_CLOSE_FD(run->status_fd);
+	return -1;
 }
 
-static int _drm_init_video(us_drm_s *drm) {
+static void _drm_ensure_dpms_power(us_drm_s *drm, bool on) {
 	us_drm_runtime_s *const run = drm->run;
-	run->saved_crtc = drmModeGetCrtc(run->fd, run->crtc_id);
-	_D_LOG_DEBUG("Setting up CRTC ...");
-	if (drmModeSetCrtc(run->fd, run->crtc_id, run->bufs[0].id, 0, 0, &run->conn_id, 1, &run->mode) < 0) {
-		_D_LOG_PERROR("Can't set CRTC");
-		return -1;
+	if (run->dpms_id > 0 && run->dpms_state != (int)on) {
+		_D_LOG_INFO("Changing DPMS power mode: %d -> %u ...", run->dpms_state, on);
+		if (drmModeConnectorSetProperty(
+			run->fd, run->conn_id, run->dpms_id,
+			(on ? DRM_MODE_DPMS_ON : DRM_MODE_DPMS_OFF)
+		) < 0) {
+			_D_LOG_PERROR("Can't set DPMS power=%u (ignored)", on);
+		}
 	}
-	if (_drm_expose_raw(drm, NULL) < 0) {
-		_D_LOG_PERROR("Can't flip the first page");
-		return -1;
-	}
-	return 0;
+	run->dpms_state = (int)on;
 }
 
-static int _drm_init_buffers(us_drm_s *drm) {
+static int _drm_init_buffers(us_drm_s *drm, const us_device_s *dev) {
 	us_drm_runtime_s *const run = drm->run;
 
-	_D_LOG_DEBUG("Initializing %u buffers ...", drm->n_bufs);
+	const uint n_bufs = (dev == NULL ? 4 : dev->run->n_bufs);
+	const char *name = (dev == NULL ? "STUB" : "DMA");
 
-	US_CALLOC(run->bufs, drm->n_bufs);
-	for (run->n_bufs = 0; run->n_bufs < drm->n_bufs; ++run->n_bufs) {
+	_D_LOG_DEBUG("Initializing %u %s buffers ...", n_bufs, name);
+
+	US_CALLOC(run->bufs, n_bufs);
+	for (run->n_bufs = 0; run->n_bufs < n_bufs; ++run->n_bufs) {
 		const uint n_buf = run->n_bufs;
 		us_drm_buffer_s *const buf = &run->bufs[n_buf];
 
-		struct drm_mode_create_dumb create = {
-			.width = run->mode.hdisplay,
-			.height = run->mode.vdisplay,
-			.bpp = 24,
-		};
-		if (drmIoctl(run->fd, DRM_IOCTL_MODE_CREATE_DUMB, &create) < 0) {
-			_D_LOG_PERROR("Can't create dumb buffer=%u", n_buf);
-			return -1;
-		}
-		buf->handle = create.handle;
-		buf->dumb_created = true;
+		buf->ctx.has_vsync = &run->has_vsync;
+		buf->ctx.exposing_dma_fd = &run->exposing_dma_fd;
 
-		u32 handles[4] = {create.handle};
-		u32 strides[4] = {create.pitch};
+		u32 handles[4] = {0};
+		u32 strides[4] = {0};
 		u32 offsets[4] = {0};
+
+		if (dev == NULL) {
+			struct drm_mode_create_dumb create = {
+				.width = run->mode.hdisplay,
+				.height = run->mode.vdisplay,
+				.bpp = 24,
+			};
+			if (drmIoctl(run->fd, DRM_IOCTL_MODE_CREATE_DUMB, &create) < 0) {
+				_D_LOG_PERROR("Can't create %s buffer=%u", name, n_buf);
+				return -1;
+			}
+			buf->handle = create.handle;
+			buf->dumb_created = true;
+
+			struct drm_mode_map_dumb map = {.handle = create.handle};
+			if (drmIoctl(run->fd, DRM_IOCTL_MODE_MAP_DUMB, &map) < 0) {
+				_D_LOG_PERROR("Can't prepare dumb buffer=%u to mapping", n_buf);
+				return -1;
+			}
+			if ((buf->data = mmap(
+				NULL, create.size,
+				PROT_READ | PROT_WRITE, MAP_SHARED,
+				run->fd, map.offset
+			)) == MAP_FAILED) {
+				_D_LOG_PERROR("Can't map buffer=%u", n_buf);
+				return -1;
+			}
+			memset(buf->data, 0, create.size);
+			buf->allocated = create.size;
+
+			handles[0] = create.handle;
+			strides[0] = create.pitch;
+
+		} else {
+			if (drmPrimeFDToHandle(run->fd, dev->run->hw_bufs[n_buf].dma_fd, &buf->handle) < 0) {
+				_D_LOG_PERROR("Can't import DMA buffer=%u from capture device", n_buf);
+				return -1;
+			}
+			handles[0] = buf->handle;
+			strides[0] = dev->run->stride;
+		}
+
 		if (drmModeAddFB2(
 			run->fd,
 			run->mode.hdisplay, run->mode.vdisplay, DRM_FORMAT_RGB888,
@@ -417,22 +529,6 @@ static int _drm_init_buffers(us_drm_s *drm) {
 			return -1;
 		}
 		buf->fb_added = true;
-
-		struct drm_mode_map_dumb map = {.handle = create.handle};
-		if (drmIoctl(run->fd, DRM_IOCTL_MODE_MAP_DUMB, &map) < 0) {
-			_D_LOG_PERROR("Can't prepare dumb buffer=%u to mapping", n_buf);
-			return -1;
-		}
-
-		if ((buf->data = mmap(
-			NULL, create.size,
-			PROT_READ | PROT_WRITE, MAP_SHARED,
-			run->fd, map.offset
-		)) == MAP_FAILED) {
-			_D_LOG_PERROR("Can't map buffer=%u", n_buf);
-			return -1;
-		}
-		buf->allocated = create.size;
 	}
 	return 0;
 }
@@ -440,8 +536,6 @@ static int _drm_init_buffers(us_drm_s *drm) {
 static int _drm_find_sink(us_drm_s *drm, uint width, uint height, float hz) {
 	us_drm_runtime_s *const run = drm->run;
 
-	int retval = -1;
-
 	run->crtc_id = 0;
 
 	_D_LOG_DEBUG("Trying to find the appropriate sink ...");
@@ -449,102 +543,130 @@ static int _drm_find_sink(us_drm_s *drm, uint width, uint height, float hz) {
 	drmModeRes *res = drmModeGetResources(run->fd);
 	if (res == NULL) {
 		_D_LOG_PERROR("Can't get resources info");
-		goto error;
+		goto done;
+	}
+	if (res->count_connectors <= 0) {
+		_D_LOG_ERROR("Can't find any connectors");
+		goto done;
 	}
-	_D_LOG_DEBUG("Found %u connectors", res->count_connectors);
 
 	for (int ci = 0; ci < res->count_connectors; ++ci) {
 		drmModeConnector *conn = drmModeGetConnector(run->fd, res->connectors[ci]);
 		if (conn == NULL) {
 			_D_LOG_PERROR("Can't get connector index=%d", ci);
-			goto error;
+			goto done;
 		}
 
-		if (run->conn_type < 0) {
-			char port[32];
-			US_SNPRINTF(port, 31, "%s-%u",
-				_connector_type_to_string(conn->connector_type),
-				conn->connector_type_id);
-			if (!strcmp(port, drm->port)) {
-				run->conn_type = conn->connector_type;
-				run->conn_type_id = conn->connector_type_id;
-			}
-		}
-		if (
-			(int)conn->connector_type != run->conn_type
-			|| (int)conn->connector_type_id != run->conn_type_id
-		) {
+		char port[32];
+		US_SNPRINTF(port, 31, "%s-%u",
+			_connector_type_to_string(conn->connector_type),
+			conn->connector_type_id);
+		if (strcmp(port, drm->port) != 0) {
 			drmModeFreeConnector(conn);
 			continue;
 		}
-		_D_LOG_DEBUG("Found requested connector for port %s: conn_type=%d, conn_type_id=%d",
-			drm->port, run->conn_type, run->conn_type_id);
+		_D_LOG_INFO("Using connector %s: conn_type=%d, conn_type_id=%d",
+			drm->port, conn->connector_type, conn->connector_type_id);
 
 		if (conn->connection != DRM_MODE_CONNECTED) {
-			_D_LOG_DEBUG("Display is not connected");
+			_D_LOG_ERROR("Connector for port %s has !DRM_MODE_CONNECTED", drm->port);
 			drmModeFreeConnector(conn);
-			break;
+			goto done;
 		}
 
-		drmModeModeInfo *best = NULL;// (conn->count_modes > 0 ? &conn->modes[0] : NULL);
-		drmModeModeInfo *closest = NULL;
-		drmModeModeInfo *pref = NULL;
-		for (int mi = 0; mi < conn->count_modes; ++mi) {
-			drmModeModeInfo *const mode = &conn->modes[mi];
-			if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
-				continue; // Paranoia for size and discard interlaced
-			}
-			const float mode_hz = _get_refresh_rate(mode);
-			if (mode->hdisplay == width && mode->vdisplay == height) {
-				best = mode; // Any mode with exact resolution
-				if (hz > 0 && mode_hz == hz) {
-					break; // Exact mode with same freq
-				}
-			}
-			if (mode->hdisplay == width && mode->vdisplay < height) {
-				if (closest == NULL || _get_refresh_rate(closest) != hz) {
-					closest = mode; // Something like 1920x1080p60 for 1920x1200p60 source
-				}
-			}
-			if (pref == NULL && (mode->type & DRM_MODE_TYPE_PREFERRED)) {
-				pref = mode; // Preferred mode if nothing is found
-			}
-		}
-		if (best == NULL) {
-			best = closest;
-		}
-		if (best == NULL) {
-			best = pref;
-		}
-		if (best == NULL) {
-			best = (conn->count_modes > 0 ? &conn->modes[0] : NULL);
-		}
-		if (best == NULL) {
-			_D_LOG_ERROR("Can't find any resolutions");
+		drmModeModeInfo *best;
+		if ((best = _find_best_mode(conn, width, height, hz)) == NULL) {
+			_D_LOG_ERROR("Can't find any appropriate display modes");
 			drmModeFreeConnector(conn);
-			break;
+			goto unplugged;
+		}
+		_D_LOG_INFO("Using best mode: %ux%up%.02f",
+			best->hdisplay, best->vdisplay, _get_refresh_rate(best));
+
+		if ((run->dpms_id = _find_dpms(run->fd, conn)) > 0) {
+			_D_LOG_INFO("Using DPMS: id=%u", run->dpms_id);
+		} else {
+			_D_LOG_INFO("Using DPMS: None");
 		}
-		assert(best->hdisplay > 0);
-		assert(best->vdisplay > 0);
 
 		u32 taken_crtcs = 0; // Unused here
 		if ((run->crtc_id = _find_crtc(run->fd, res, conn, &taken_crtcs)) == 0) {
 			_D_LOG_ERROR("Can't find CRTC");
 			drmModeFreeConnector(conn);
-			goto error;
+			goto done;
 		}
-		memcpy(&run->mode, best, sizeof(drmModeModeInfo));
+		_D_LOG_INFO("Using CRTC: id=%u", run->crtc_id);
+
 		run->conn_id = conn->connector_id;
+		memcpy(&run->mode, best, sizeof(drmModeModeInfo));
 
 		drmModeFreeConnector(conn);
 		break;
 	}
 
-	retval = 0;
-
-error:
+done:
 	drmModeFreeResources(res);
-	return retval;
+	return (run->crtc_id > 0 ? 0 : -1);
+
+unplugged:
+	drmModeFreeResources(res);
+	return -2;
+}
+
+static drmModeModeInfo *_find_best_mode(drmModeConnector *conn, uint width, uint height, float hz) {
+	drmModeModeInfo *best = NULL;
+	drmModeModeInfo *closest = NULL;
+	drmModeModeInfo *pref = NULL;
+
+	for (int mi = 0; mi < conn->count_modes; ++mi) {
+		drmModeModeInfo *const mode = &conn->modes[mi];
+		if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
+			continue; // Discard interlaced
+		}
+		const float mode_hz = _get_refresh_rate(mode);
+		if (mode->hdisplay == width && mode->vdisplay == height) {
+			best = mode; // Any mode with exact resolution
+			if (hz > 0 && mode_hz == hz) {
+				break; // Exact mode with same freq
+			}
+		}
+		if (mode->hdisplay == width && mode->vdisplay < height) {
+			if (closest == NULL || _get_refresh_rate(closest) != hz) {
+				closest = mode; // Something like 1920x1080p60 for 1920x1200p60 source
+			}
+		}
+		if (pref == NULL && (mode->type & DRM_MODE_TYPE_PREFERRED)) {
+			pref = mode; // Preferred mode if nothing is found
+		}
+	}
+
+	if (best == NULL) {
+		best = closest;
+	}
+	if (best == NULL) {
+		best = pref;
+	}
+	if (best == NULL) {
+		best = (conn->count_modes > 0 ? &conn->modes[0] : NULL);
+	}
+	assert(best == NULL || best->hdisplay > 0);
+	assert(best == NULL || best->vdisplay > 0);
+	return best;
+}
+
+static u32 _find_dpms(int fd, drmModeConnector *conn) {
+	for (int pi = 0; pi < conn->count_props; pi++) {
+		drmModePropertyPtr prop = drmModeGetProperty(fd, conn->props[pi]);
+		if (prop != NULL) {
+			if (!strcmp(prop->name, "DPMS")) {
+				const u32 id = prop->prop_id;
+				drmModeFreeProperty(prop);
+				return id;
+			}
+			drmModeFreeProperty(prop);
+		}
+	}
+	return 0;
 }
 
 static u32 _find_crtc(int fd, drmModeRes *res, drmModeConnector *conn, u32 *taken_crtcs) {
@@ -574,22 +696,26 @@ static const char *_connector_type_to_string(u32 type) {
 	switch (type) {
 #		define CASE_NAME(x_suffix, x_name) \
 			case DRM_MODE_CONNECTOR_##x_suffix: return x_name;
-		CASE_NAME(VGA, "VGA");
-		CASE_NAME(DVII, "DVI-I");
-		CASE_NAME(DVID, "DVI-D");
-		CASE_NAME(DVIA, "DVI-A");
-		CASE_NAME(Composite, "Composite");
-		CASE_NAME(SVIDEO, "SVIDEO");
-		CASE_NAME(LVDS, "LVDS");
-		CASE_NAME(Component, "Component");
-		CASE_NAME(9PinDIN, "DIN");
-		CASE_NAME(DisplayPort, "DP");
-		CASE_NAME(HDMIA, "HDMI-A");
-		CASE_NAME(HDMIB, "HDMI-B");
-		CASE_NAME(TV, "TV");
-		CASE_NAME(eDP, "eDP");
-		CASE_NAME(VIRTUAL, "Virtual");
-		CASE_NAME(DSI, "DSI");
+		CASE_NAME(VGA,			"VGA");
+		CASE_NAME(DVII,			"DVI-I");
+		CASE_NAME(DVID,			"DVI-D");
+		CASE_NAME(DVIA,			"DVI-A");
+		CASE_NAME(Composite,	"Composite");
+		CASE_NAME(SVIDEO,		"SVIDEO");
+		CASE_NAME(LVDS,			"LVDS");
+		CASE_NAME(Component,	"Component");
+		CASE_NAME(9PinDIN,		"DIN");
+		CASE_NAME(DisplayPort,	"DP");
+		CASE_NAME(HDMIA,		"HDMI-A");
+		CASE_NAME(HDMIB,		"HDMI-B");
+		CASE_NAME(TV,			"TV");
+		CASE_NAME(eDP,			"eDP");
+		CASE_NAME(VIRTUAL,		"Virtual");
+		CASE_NAME(DSI,			"DSI");
+		CASE_NAME(DPI,			"DPI");
+		CASE_NAME(WRITEBACK,	"Writeback");
+		CASE_NAME(SPI,			"SPI");
+		CASE_NAME(USB,			"USB");
 		case DRM_MODE_CONNECTOR_Unknown: break;
 #		undef CASE_NAME
 	}

src/v4p/drm.h

@@ -27,22 +27,17 @@
 
 #include "../libs/types.h"
 #include "../libs/frame.h"
-
-#include "ftext.h"
+#include "../libs/frametext.h"
+#include "../libs/device.h"
 
 
 typedef enum {
-	US_DRM_EXPOSE_FRAME = 0,
-	US_DRM_EXPOSE_NO_SIGNAL,
-	US_DRM_EXPOSE_BUSY,
-} us_drm_expose_e;
-
-typedef enum {
-	US_DRM_STATE_OK = 0,
-	US_DRM_STATE_CLOSED,
-	US_DRM_STATE_RETRY, // Not used directly
-	US_DRM_STATE_NO_DISPLAY,
-} us_drm_state_e;
+	US_DRM_STUB_USER = 1,
+	US_DRM_STUB_BAD_RESOLUTION,
+	US_DRM_STUB_BAD_FORMAT,
+	US_DRM_STUB_NO_SIGNAL,
+	US_DRM_STUB_BUSY,
+} us_drm_stub_e;
 
 typedef struct {
 	u32		id;
@@ -51,34 +46,34 @@ typedef struct {
 	uz		allocated;
 	bool	dumb_created;
 	bool	fb_added;
+	struct {
+		bool	*has_vsync;
+		int		*exposing_dma_fd;
+	} ctx;
 } us_drm_buffer_s;
 
 typedef struct {
+	int				status_fd;
 	int				fd;
-	int				conn_type;
-	int				conn_type_id;
 	u32				crtc_id;
-	drmModeModeInfo	mode;
 	u32				conn_id;
+	u32				dpms_id;
+	drmModeModeInfo	mode;
 	us_drm_buffer_s	*bufs;
 	uint			n_bufs;
 	drmModeCrtc		*saved_crtc;
-	uint			next_n_buf;
+	int				dpms_state;
+	bool			opened_for_stub;
 	bool			has_vsync;
-
-	us_ftext_s		*ft;
-
-	uint			p_width;
-	uint			p_height;
-	float			p_hz;
-
-	us_drm_state_e	state;
+	int				exposing_dma_fd;
+	uint			stub_n_buf;
+	bool			unplugged_reported;
+	us_frametext_s	*ft;
 } us_drm_runtime_s;
 
 typedef struct {
 	char	*path;
 	char	*port;
-	uint	n_bufs;
 	uint	timeout;
 
 	us_drm_runtime_s *run;
@@ -88,5 +83,10 @@ typedef struct {
 us_drm_s *us_drm_init(void);
 void us_drm_destroy(us_drm_s *drm);
 
+int us_drm_open(us_drm_s *drm, const us_device_s *dev);
+void us_drm_close(us_drm_s *drm);
+
+int us_drm_dpms_power_off(us_drm_s *drm);
 int us_drm_wait_for_vsync(us_drm_s *drm);
-int us_drm_expose(us_drm_s *drm, us_drm_expose_e ex, const us_frame_s *frame, float hz);
+int us_drm_expose_stub(us_drm_s *drm, us_drm_stub_e stub, const us_device_s *dev);
+int us_drm_expose_dma(us_drm_s *drm, const us_hw_buffer_s *hw);

src/v4p/main.c

@@ -25,7 +25,6 @@
 #include <stdatomic.h>
 #include <string.h>
 #include <unistd.h>
-#include <signal.h>
 #include <getopt.h>
 #include <errno.h>
 #include <assert.h>
@@ -41,6 +40,7 @@
 #include "../libs/tools.h"
 #include "../libs/logging.h"
 #include "../libs/device.h"
+#include "../libs/signal.h"
 #include "../libs/options.h"
 
 #include "drm.h"
@@ -82,7 +82,6 @@ atomic_bool _g_ustreamer_online = false;
 
 
 static void _signal_handler(int signum);
-static void _install_signal_handlers(void);
 
 static void _main_loop();
 static void *_follower_thread(void *v_unix_follow);
@@ -137,13 +136,13 @@ int main(int argc, char *argv[]) {
 #	undef OPT_NUMBER
 #	undef OPT_SET
 
-	_install_signal_handlers();
+	us_install_signals_handler(_signal_handler, false);
 
 	pthread_t follower_tid;
 	if (unix_follow != NULL) {
 		US_THREAD_CREATE(follower_tid, _follower_thread, unix_follow);
 	}
-	_main_loop(unix_follow);
+	_main_loop();
 	if (unix_follow != NULL) {
 		US_THREAD_JOIN(follower_tid);
 	}
@@ -159,114 +158,103 @@ static void _signal_handler(int signum) {
 	atomic_store(&_g_stop, true);
 }
 
-static void _install_signal_handlers(void) {
-	struct sigaction sig_act = {0};
-
-	assert(!sigemptyset(&sig_act.sa_mask));
-	sig_act.sa_handler = _signal_handler;
-	assert(!sigaddset(&sig_act.sa_mask, SIGINT));
-	assert(!sigaddset(&sig_act.sa_mask, SIGTERM));
-	assert(!sigaddset(&sig_act.sa_mask, SIGPIPE));
-
-	US_LOG_DEBUG("Installing SIGINT handler ...");
-	assert(!sigaction(SIGINT, &sig_act, NULL));
-
-	US_LOG_DEBUG("Installing SIGTERM handler ...");
-	assert(!sigaction(SIGTERM, &sig_act, NULL));
-
-	US_LOG_DEBUG("Installing SIGTERM handler ...");
-	assert(!sigaction(SIGPIPE, &sig_act, NULL));
-}
-
 static void _main_loop(void) {
 	us_drm_s *drm = us_drm_init();
 	drm->port = "HDMI-A-2";
 
 	us_device_s *dev = us_device_init();
 	dev->path = "/dev/kvmd-video";
-	dev->n_bufs = drm->n_bufs;
+	dev->n_bufs = 6;
 	dev->format = V4L2_PIX_FMT_RGB24;
 	dev->dv_timings = true;
 	dev->persistent = true;
+	dev->dma_export = true;
+	dev->dma_required = true;
 
+	int once = 0;
+	ldf blank_at_ts = 0;
+	int drm_opened = -1;
 	while (!atomic_load(&_g_stop)) {
+#		define CHECK(x_arg) if ((x_arg) < 0) { goto close; }
+
+		if (drm_opened <= 0) {
+			blank_at_ts = 0;
+			CHECK(drm_opened = us_drm_open(drm, NULL));
+		}
+		assert(drm_opened > 0);
+
 		if (atomic_load(&_g_ustreamer_online)) {
-			if (us_drm_wait_for_vsync(drm) == 0) {
-				us_drm_expose(drm, US_DRM_EXPOSE_BUSY, NULL, 0);
-			}
-			if (dev->run->capturing) {
-				goto close;
-			} else {
-				_slowdown();
-				continue;
-			}
+			blank_at_ts = 0;
+			US_ONCE({ US_LOG_INFO("DRM: Online stream is active, stopping capture ..."); });
+			CHECK(us_drm_wait_for_vsync(drm));
+			CHECK(us_drm_expose_stub(drm, US_DRM_STUB_BUSY, NULL));
+			_slowdown();
+			continue;
 		}
 
 		if (us_device_open(dev) < 0) {
-			goto close;
-		}
-		if (us_device_switch_capturing(dev, true) < 0) {
-			goto close;
+			ldf now_ts = us_get_now_monotonic();
+			if (blank_at_ts == 0) {
+				blank_at_ts = now_ts + 5;
+			}
+			if (now_ts <= blank_at_ts) {
+				CHECK(us_drm_wait_for_vsync(drm));
+				CHECK(us_drm_expose_stub(drm, US_DRM_STUB_NO_SIGNAL, NULL));
+			} else {
+				US_ONCE({ US_LOG_INFO("DRM: Turning off the display by timeout ..."); });
+				CHECK(us_drm_dpms_power_off(drm));
+			}
+			_slowdown();
+			continue;
 		}
 
+		once = 0;
+		blank_at_ts = 0;
+		us_drm_close(drm);
+		CHECK(drm_opened = us_drm_open(drm, dev));
+
+		us_hw_buffer_s *prev_hw = NULL;
 		while (!atomic_load(&_g_stop)) {
 			if (atomic_load(&_g_ustreamer_online)) {
-				if (us_drm_wait_for_vsync(drm) == 0) {
-					us_drm_expose(drm, US_DRM_EXPOSE_BUSY, NULL, 0);
-				}
 				goto close;
 			}
 
-			if (us_drm_wait_for_vsync(drm) < 0) {
-				_slowdown();
-				continue;
+			CHECK(us_drm_wait_for_vsync(drm));
+
+			if (prev_hw != NULL) {
+				CHECK(us_device_release_buffer(dev, prev_hw));
+				prev_hw = NULL;
 			}
 
-			bool has_read;
-			bool has_write;
-			bool has_error;
-			const int selected = us_device_select(dev, &has_read, &has_write, &has_error);
+			us_hw_buffer_s *hw;
+			switch (us_device_grab_buffer(dev, &hw)) {
+				case -2: continue; // Broken frame
+				case -1: goto close; // Any error
+				default: break; // Grabbed on >= 0
+			}
 
-			if (selected < 0) {
-				if (errno != EINTR) {
-					US_LOG_PERROR("Mainloop select() error");
-					goto close;
-				}
-			} else if (selected == 0) { // Persistent timeout
-				if (us_drm_expose(drm, US_DRM_EXPOSE_NO_SIGNAL, NULL, 0) < 0) {
-					_slowdown();
-					continue;
-				}
+			if (drm_opened == 0) {
+				CHECK(us_drm_expose_dma(drm, hw));
+				prev_hw = hw;
 			} else {
-				if (has_read) {
-					US_LOG_DEBUG("Frame is ready");
-					us_hw_buffer_s *hw;
-					const int buf_index = us_device_grab_buffer(dev, &hw);
-					if (buf_index >= 0) {
-						if (us_drm_expose(drm, US_DRM_EXPOSE_FRAME, &hw->raw, dev->run->hz) < 0) {
-							_slowdown();
-							continue;
-						}
-						if (us_device_release_buffer(dev, hw) < 0) {
-							goto close;
-						}
-					} else if (buf_index == -2) {
-						goto close;
-					}
-				}
-				if (has_error) {
-					US_LOG_INFO("Got V4L2 event");
-					if (us_device_consume_event(dev) < 0) {
-						goto close;
-					}
-				}
+				CHECK(us_drm_expose_stub(drm, drm_opened, dev));
+				CHECK(us_device_release_buffer(dev, hw));
+			}
+
+			if (drm_opened > 0) {
+				_slowdown();
 			}
 		}
 
 	close:
-		us_device_switch_capturing(dev, false);
+		us_drm_close(drm);
+		drm_opened = -1;
+
 		us_device_close(dev);
+
 		_slowdown();
+
+#		undef CHECK
 	}
 
 	us_device_destroy(dev);
@@ -274,11 +262,10 @@ static void _main_loop(void) {
 }
 
 static void *_follower_thread(void *v_unix_follow) {
+	US_THREAD_SETTLE("follower");
 	const char *path = v_unix_follow;
 	assert(path != NULL);
 
-	US_THREAD_RENAME("follower");
-
 	while (!atomic_load(&_g_stop)) {
 		int fd = socket(AF_UNIX, SOCK_STREAM, 0);
 		assert(fd >= 0);
@@ -289,7 +276,7 @@ static void *_follower_thread(void *v_unix_follow) {
 
 		const bool online = !connect(fd, (struct sockaddr *)&addr, sizeof(addr));
 		atomic_store(&_g_ustreamer_online, online);
-		US_CLOSE_FD(fd, close); // cppcheck-suppress unreadVariable
+		US_CLOSE_FD(fd); // cppcheck-suppress unreadVariable
 
 		usleep(200 * 1000);
 	}

tools/make-jpeg-h.py

@@ -1,94 +0,0 @@
-#!/usr/bin/env -S python3 -B
-# ========================================================================== #
-#                                                                            #
-#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
-#                                                                            #
-#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
-#                                                                            #
-#    This program is free software: you can redistribute it and/or modify    #
-#    it under the terms of the GNU General Public License as published by    #
-#    the Free Software Foundation, either version 3 of the License, or       #
-#    (at your option) any later version.                                     #
-#                                                                            #
-#    This program is distributed in the hope that it will be useful,         #
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
-#    GNU General Public License for more details.                            #
-#                                                                            #
-#    You should have received a copy of the GNU General Public License       #
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
-#                                                                            #
-# ========================================================================== #
-
-
-import sys
-import os
-import io
-import struct
-
-import common
-
-
-# =====
-def _get_jpeg_size(data: bytes) -> tuple[int, int]:
-    # https://sheep.horse/2013/9/finding_the_dimensions_of_a_jpeg_file_in_python.html
-
-    stream = io.BytesIO(data)
-    while True:
-        marker = struct.unpack(">H", stream.read(2))[0]
-        if marker == 0xFFD9:
-            raise RuntimeError("Can't find jpeg size")
-
-        if (
-            marker == 0xFFD8  # Start of image
-            or marker == 0xFF01  # Private marker
-            or 0xFFD0 <= marker <= 0xFFD7  # Restart markers
-        ):
-            continue
-
-        # All other markers specify chunks with lengths
-        length = struct.unpack(">H", stream.read(2))[0]
-
-        if marker == 0xFFC0:  # Baseline DCT chunk, has the info we want
-            (_, height, width) = struct.unpack(">BHH", stream.read(5))
-            return (width, height)
-
-        # Not the chunk we want, skip it
-        stream.seek(length - 2, 1)
-
-
-# =====
-def main() -> None:
-    assert len(sys.argv) == 4, f"{sys.argv[0]} <file.jpeg> <file.h> <name>"
-    jpeg_path = sys.argv[1]
-    c_path = sys.argv[2]
-    h_path = os.path.basename(c_path[:-2]) + ".h"
-    name = sys.argv[3]
-
-    with open(jpeg_path, "rb") as file:
-        data = file.read()
-
-    (width, height) = _get_jpeg_size(data)
-
-    data_text = "{\n\t" + ",\n\t".join(
-        ", ".join(
-            f"0x{ch:02X}"
-            for ch in data[index:index + 20]
-        )
-        for index in range(0, len(data), 20)
-    ) + ",\n}"
-
-    text = f"{common.C_PREPEND}\n"
-    text += f"#include \"{h_path}\"\n\n\n"
-    text += f"const unsigned US_{name}_JPEG_WIDTH = {width};\n"
-    text += f"const unsigned US_{name}_JPEG_HEIGHT = {height};\n\n"
-    text += f"const size_t US_{name}_JPEG_DATA_SIZE = {len(data)};\n"
-    text += f"const uint8_t US_{name}_JPEG_DATA[] = {data_text};\n"
-
-    with open(c_path, "w") as file:
-        file.write(text)
-
-
-# =====
-if __name__ == "__main__":
-    main()