Bump version: 0.58 → 0.59

.bumpversion.cfg

@@ -1,7 +1,7 @@
 [bumpversion]
 commit = True
 tag = True
-current_version = 0.55
+current_version = 0.59
 parse = (?P<major>\d+)\.(?P<minor>\d+)(\.(?P<patch>\d+)(\-(?P<release>[a-z]+))?)?
 serialize = 
 	{major}.{minor}

Makefile

@@ -7,7 +7,7 @@ CC ?= gcc
 
 # =====
 LIBS = -lm -ljpeg -pthread -levent -levent_pthreads -luuid
-override CFLAGS += -c -std=c99 -Wall -Wextra -D_GNU_SOURCE
+override CFLAGS += -c -std=c11 -Wall -Wextra -D_GNU_SOURCE
 SOURCES = $(shell ls src/*.c src/encoders/cpu/*.c src/encoders/hw/*.c)
 PROG = ustreamer
 

PKGBUILD

@@ -3,7 +3,7 @@
 
 
 pkgname=ustreamer
-pkgver=0.55
+pkgver=0.59
 pkgrel=1
 pkgdesc="Lightweight and fast MJPG-HTTP streamer"
 url="https://github.com/pi-kvm/ustreamer"

README.md

@@ -56,6 +56,8 @@ The recommended way of running µStreamer with [Auvidea B101](https://www.raspbe
 $ ./ustreamer \
     --format=uyvy \ # Device input format
     --encoder=omx \ # Hardware encoding with OpenMAX
+    --workers=3 \ # Maximum workers for OpenMAX
+    --persistent \ # Don't re-initialize device on timeout (for example when HDMI cable was disconnected)
     --dv-timings \ # Use DV-timings
     --drop-same-frames=30 # Save that traffic
 ```

README.ru.md

@@ -56,6 +56,8 @@ $ ./ustreamer --help
 $ ./ustreamer \
     --format=uyvy \ # Настройка входного формата устройства
     --encoder=omx \ # Использование аппаратного кодирования с помощью OpenMAX
+    --workers=3 \ # Максимум воркеров для OpenMAX
+    --persistent \ # Не переинициализировать устройство при таймауте (например, когда был отключен HDMI-кабель)
     --dv-timings \ # Включение DV-таймингов
     --drop-same-frames=30 # Экономим трафик
 ```

src/config.h

@@ -22,4 +22,4 @@
 
 #pragma once
 
-#define VERSION "0.55"
+#define VERSION "0.59"

src/device.c

@@ -95,7 +95,7 @@ struct device_t *device_init() {
 	dev->height = 480;
 	dev->format = V4L2_PIX_FMT_YUYV;
 	dev->standard = V4L2_STD_UNKNOWN;
-	dev->n_buffers = max_u(sysconf(_SC_NPROCESSORS_ONLN), 1) + 1;
+	dev->n_buffers = max_u(min_u(sysconf(_SC_NPROCESSORS_ONLN), 4), 1) + 1;
 	dev->n_workers = dev->n_buffers;
 	dev->timeout = 1;
 	dev->error_delay = 1;
@@ -201,6 +201,71 @@ void device_close(struct device_t *dev) {
 	}
 }
 
+int device_switch_capturing(struct device_t *dev, bool enable) {
+	if (enable != dev->run->capturing) {
+		enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+		LOG_DEBUG("Calling ioctl(%s) ...", (enable ? "VIDIOC_STREAMON" : "VIDIOC_STREAMOFF"));
+		if (xioctl(dev->run->fd, (enable ? VIDIOC_STREAMON : VIDIOC_STREAMOFF), &type) < 0) {
+			LOG_PERROR("Unable to %s capturing", (enable ? "start" : "stop"));
+			if (enable) {
+				return -1;
+			}
+		}
+
+		dev->run->capturing = enable;
+		LOG_INFO("Capturing %s", (enable ? "started" : "stopped"));
+	}
+    return 0;
+}
+
+int device_grab_buffer(struct device_t *dev, struct v4l2_buffer *buf_info) {
+	MEMSET_ZERO_PTR(buf_info);
+	buf_info->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	buf_info->memory = V4L2_MEMORY_MMAP;
+
+	LOG_DEBUG("Calling ioctl(VIDIOC_DQBUF) ...");
+	if (xioctl(dev->run->fd, VIDIOC_DQBUF, buf_info) < 0) {
+		LOG_PERROR("Unable to dequeue buffer");
+		return -1;
+	}
+
+	LOG_DEBUG("Got a new frame in buffer index=%u; bytesused=%u", buf_info->index, buf_info->bytesused);
+	if (buf_info->index >= dev->run->n_buffers) {
+		LOG_ERROR("Got invalid buffer index=%u; nbuffers=%u", buf_info->index, dev->run->n_buffers);
+		return -1;
+	}
+	return 0;
+}
+
+int device_release_buffer(struct device_t *dev, struct v4l2_buffer *buf_info) {
+	LOG_DEBUG("Calling ioctl(VIDIOC_QBUF) ...");
+	if (xioctl(dev->run->fd, VIDIOC_QBUF, buf_info) < 0) {
+		LOG_PERROR("Unable to requeue buffer");
+		return -1;
+	}
+	return 0;
+}
+
+int device_consume_event(struct device_t *dev) {
+	struct v4l2_event event;
+
+	LOG_DEBUG("Calling ioctl(VIDIOC_DQEVENT) ...");
+	if (!xioctl(dev->run->fd, VIDIOC_DQEVENT, &event)) {
+		switch (event.type) {
+			case V4L2_EVENT_SOURCE_CHANGE:
+				LOG_INFO("Got V4L2_EVENT_SOURCE_CHANGE: source changed");
+				return -1;
+			case V4L2_EVENT_EOS:
+				LOG_INFO("Got V4L2_EVENT_EOS: end of stream (ignored)");
+				return 0;
+		}
+	} else {
+		LOG_PERROR("Got some V4L2 device event, but where is it? ");
+	}
+	return 0;
+}
+
 static int _device_open_check_cap(struct device_t *dev) {
 	struct v4l2_capability cap;
 	int input = dev->input; // Needs pointer to int for ioctl()

src/device.h

@@ -24,7 +24,6 @@
 
 #include <stddef.h>
 #include <stdbool.h>
-#include <signal.h>
 
 #include <linux/videodev2.h>
 
@@ -106,7 +105,6 @@ struct device_t {
 	struct controls_t *ctl;
 
 	struct device_runtime_t *run;
-	sig_atomic_t volatile stop;
 };
 
 
@@ -118,3 +116,8 @@ v4l2_std_id device_parse_standard(const char *str);
 
 int device_open(struct device_t *dev);
 void device_close(struct device_t *dev);
+
+int device_switch_capturing(struct device_t *dev, bool enable);
+int device_grab_buffer(struct device_t *dev, struct v4l2_buffer *buf_info);
+int device_release_buffer(struct device_t *dev, struct v4l2_buffer *buf_info);
+int device_consume_event(struct device_t *dev);

src/encoder.c

@@ -57,7 +57,7 @@ struct encoder_t *encoder_init() {
 	A_CALLOC(run, 1);
 	run->type = ENCODER_TYPE_CPU;
 	run->quality = 80;
-	A_PTHREAD_M_INIT(&run->mutex);
+	A_MUTEX_INIT(&run->mutex);
 
 	A_CALLOC(encoder, 1);
 	encoder->type = run->type;
@@ -119,7 +119,7 @@ void encoder_destroy(struct encoder_t *encoder) {
 		free(encoder->run->omxs);
 	}
 #	endif
-	A_PTHREAD_M_DESTROY(&encoder->run->mutex);
+	A_MUTEX_DESTROY(&encoder->run->mutex);
 	free(encoder->run);
 	free(encoder);
 }
@@ -150,9 +150,9 @@ void encoder_prepare_live(struct encoder_t *encoder, struct device_t *dev) {
 		&& encoder->run->type != ENCODER_TYPE_HW
 	) {
 		LOG_INFO("Switching to HW JPEG encoder because the input format is (M)JPEG");
-		A_PTHREAD_M_LOCK(&encoder->run->mutex);
+		A_MUTEX_LOCK(&encoder->run->mutex);
 		encoder->run->type = ENCODER_TYPE_HW;
-		A_PTHREAD_M_UNLOCK(&encoder->run->mutex);
+		A_MUTEX_UNLOCK(&encoder->run->mutex);
 	}
 
 	if (encoder->run->type == ENCODER_TYPE_HW) {
@@ -161,9 +161,9 @@ void encoder_prepare_live(struct encoder_t *encoder, struct device_t *dev) {
 			goto use_fallback;
 		}
 		if (hw_encoder_prepare_live(dev, encoder->quality) < 0) {
-			A_PTHREAD_M_LOCK(&encoder->run->mutex);
+			A_MUTEX_LOCK(&encoder->run->mutex);
 			encoder->run->quality = 0;
-			A_PTHREAD_M_UNLOCK(&encoder->run->mutex);
+			A_MUTEX_UNLOCK(&encoder->run->mutex);
 			LOG_INFO("Using JPEG quality: HW-default");
 		}
 	}
@@ -181,10 +181,10 @@ void encoder_prepare_live(struct encoder_t *encoder, struct device_t *dev) {
 	return;
 
 	use_fallback:
-		A_PTHREAD_M_LOCK(&encoder->run->mutex);
+		A_MUTEX_LOCK(&encoder->run->mutex);
 		encoder->run->type = ENCODER_TYPE_CPU;
 		encoder->run->quality = encoder->quality;
-		A_PTHREAD_M_UNLOCK(&encoder->run->mutex);
+		A_MUTEX_UNLOCK(&encoder->run->mutex);
 }
 
 #pragma GCC diagnostic ignored "-Wunused-label"
@@ -213,10 +213,10 @@ int encoder_compress_buffer(struct encoder_t *encoder, struct device_t *dev, uns
 #	pragma GCC diagnostic push
 	use_fallback:
 		LOG_INFO("Error while compressing, falling back to CPU");
-		A_PTHREAD_M_LOCK(&encoder->run->mutex);
+		A_MUTEX_LOCK(&encoder->run->mutex);
 		encoder->run->type = ENCODER_TYPE_CPU;
 		encoder->run->quality = encoder->quality;
-		A_PTHREAD_M_UNLOCK(&encoder->run->mutex);
+		A_MUTEX_UNLOCK(&encoder->run->mutex);
 		return -1;
 #	pragma GCC diagnostic pop
 }

src/encoders/omx/encoder.c

@@ -42,8 +42,8 @@
 #include "encoder.h"
 
 
-#define INPUT_PORT 340
-#define OUTPUT_PORT 341
+static const OMX_U32 _INPUT_PORT = 340;
+static const OMX_U32 _OUTPUT_PORT = 341;
 
 
 static int _i_omx = 0;
@@ -300,7 +300,7 @@ static int _omx_setup_input(struct omx_encoder_t *omx, struct device_t *dev) {
 
 	LOG_DEBUG("Setting up OMX JPEG input port ...");
 
-	if (component_get_portdef(&omx->encoder, &portdef, INPUT_PORT) < 0) {
+	if (component_get_portdef(&omx->encoder, &portdef, _INPUT_PORT) < 0) {
 		LOG_ERROR("... first");
 		return -1;
 	}
@@ -338,17 +338,17 @@ static int _omx_setup_input(struct omx_encoder_t *omx, struct device_t *dev) {
 		return -1;
 	}
 
-	if (component_get_portdef(&omx->encoder, &portdef, INPUT_PORT) < 0) {
+	if (component_get_portdef(&omx->encoder, &portdef, _INPUT_PORT) < 0) {
 		LOG_ERROR("... second");
 		return -1;
 	}
 
-	if (component_enable_port(&omx->encoder, INPUT_PORT) < 0) {
+	if (component_enable_port(&omx->encoder, _INPUT_PORT) < 0) {
 		return -1;
 	}
 	omx->i_input_port_enabled = true;
 
-	if ((error = OMX_AllocateBuffer(omx->encoder, &omx->input_buffer, INPUT_PORT, NULL, portdef.nBufferSize)) != OMX_ErrorNone) {
+	if ((error = OMX_AllocateBuffer(omx->encoder, &omx->input_buffer, _INPUT_PORT, NULL, portdef.nBufferSize)) != OMX_ErrorNone) {
 		LOG_OMX_ERROR(error, "Can't allocate OMX JPEG input buffer");
 		return -1;
 	}
@@ -361,7 +361,7 @@ static int _omx_setup_output(struct omx_encoder_t *omx, unsigned quality) {
 
 	LOG_DEBUG("Setting up OMX JPEG output port ...");
 
-	if (component_get_portdef(&omx->encoder, &portdef, OUTPUT_PORT) < 0) {
+	if (component_get_portdef(&omx->encoder, &portdef, _OUTPUT_PORT) < 0) {
 		LOG_ERROR("... first");
 		return -1;
 	}
@@ -374,7 +374,7 @@ static int _omx_setup_output(struct omx_encoder_t *omx, unsigned quality) {
 		return -1;
 	}
 
-	if (component_get_portdef(&omx->encoder, &portdef, OUTPUT_PORT) < 0) {
+	if (component_get_portdef(&omx->encoder, &portdef, _OUTPUT_PORT) < 0) {
 		LOG_ERROR("... second");
 		return -1;
 	}
@@ -395,7 +395,7 @@ static int _omx_setup_output(struct omx_encoder_t *omx, unsigned quality) {
 		OMX_PARAM_IJGSCALINGTYPE ijg;
 
 		OMX_INIT_STRUCTURE(ijg);
-		ijg.nPortIndex = OUTPUT_PORT;
+		ijg.nPortIndex = _OUTPUT_PORT;
 		ijg.bEnabled = OMX_TRUE;
 
 		if ((error = OMX_SetParameter(omx->encoder, OMX_IndexParamBrcmEnableIJGTableScaling, &ijg)) != OMX_ErrorNone) {
@@ -408,7 +408,7 @@ static int _omx_setup_output(struct omx_encoder_t *omx, unsigned quality) {
 		OMX_IMAGE_PARAM_QFACTORTYPE qfactor;
 
 		OMX_INIT_STRUCTURE(qfactor);
-		qfactor.nPortIndex = OUTPUT_PORT;
+		qfactor.nPortIndex = _OUTPUT_PORT;
 		qfactor.nQFactor = quality;
 
 		if ((error = OMX_SetParameter(omx->encoder, OMX_IndexParamQFactor, &qfactor)) != OMX_ErrorNone) {
@@ -417,12 +417,12 @@ static int _omx_setup_output(struct omx_encoder_t *omx, unsigned quality) {
 		}
 	}
 
-	if (component_enable_port(&omx->encoder, OUTPUT_PORT) < 0) {
+	if (component_enable_port(&omx->encoder, _OUTPUT_PORT) < 0) {
 		return -1;
 	}
 	omx->i_output_port_enabled = true;
 
-	if ((error = OMX_AllocateBuffer(omx->encoder, &omx->output_buffer, OUTPUT_PORT, NULL, portdef.nBufferSize)) != OMX_ErrorNone) {
+	if ((error = OMX_AllocateBuffer(omx->encoder, &omx->output_buffer, _OUTPUT_PORT, NULL, portdef.nBufferSize)) != OMX_ErrorNone) {
 		LOG_OMX_ERROR(error, "Can't allocate OMX JPEG output buffer");
 		return -1;
 	}
@@ -434,23 +434,23 @@ static int _omx_encoder_clear_ports(struct omx_encoder_t *omx) {
 	int retcode = 0;
 
 	if (omx->i_output_port_enabled) {
-		retcode -= component_disable_port(&omx->encoder, OUTPUT_PORT);
+		retcode -= component_disable_port(&omx->encoder, _OUTPUT_PORT);
 		omx->i_output_port_enabled = false;
 	}
 	if (omx->i_input_port_enabled) {
-		retcode -= component_disable_port(&omx->encoder, INPUT_PORT);
+		retcode -= component_disable_port(&omx->encoder, _INPUT_PORT);
 		omx->i_input_port_enabled = false;
 	}
 
 	if (omx->input_buffer) {
-		if ((error = OMX_FreeBuffer(omx->encoder, INPUT_PORT, omx->input_buffer)) != OMX_ErrorNone) {
+		if ((error = OMX_FreeBuffer(omx->encoder, _INPUT_PORT, omx->input_buffer)) != OMX_ErrorNone) {
 			LOG_OMX_ERROR(error, "Can't free OMX JPEG input buffer");
 			// retcode -= 1;
 		}
 		omx->input_buffer = NULL;
 	}
 	if (omx->output_buffer) {
-		if ((error = OMX_FreeBuffer(omx->encoder, OUTPUT_PORT, omx->output_buffer)) != OMX_ErrorNone) {
+		if ((error = OMX_FreeBuffer(omx->encoder, _OUTPUT_PORT, omx->output_buffer)) != OMX_ErrorNone) {
 			LOG_OMX_ERROR(error, "Can't free OMX JPEG output buffer");
 			// retcode -= 1;
 		}

src/http.c

@@ -22,6 +22,7 @@
 
 #include <stdlib.h>
 #include <stdbool.h>
+#include <stdatomic.h>
 #include <string.h>
 #include <strings.h>
 #include <unistd.h>
@@ -147,6 +148,10 @@ int http_server_listen(struct http_server_t *server) {
 
 	server->run->drop_same_frames_blank = max_u(server->drop_same_frames, server->run->drop_same_frames_blank);
 
+	if (server->slowdown) {
+		stream_switch_slowdown(server->run->stream, true);
+	}
+
 	evhttp_set_timeout(server->run->http, server->timeout);
 
 	if (server->unix_path) {
@@ -264,10 +269,10 @@ static void _http_callback_state(struct evhttp_request *request, void *v_server)
 
 #	define ENCODER(_next) server->run->stream->encoder->_next
 
-	A_PTHREAD_M_LOCK(&ENCODER(run->mutex));
+	A_MUTEX_LOCK(&ENCODER(run->mutex));
 	encoder_run_type = ENCODER(run->type);
 	encoder_run_quality = ENCODER(run->quality);
-	A_PTHREAD_M_UNLOCK(&ENCODER(run->mutex));
+	A_MUTEX_UNLOCK(&ENCODER(run->mutex));
 
 	assert((buf = evbuffer_new()));
 
@@ -326,11 +331,15 @@ static void _http_callback_snapshot(struct evhttp_request *request, void *v_serv
 	ADD_HEADER("Pragma", "no-cache");
 	ADD_HEADER("Expires", "Mon, 3 Jan 2000 12:34:56 GMT");
 
-#	define ADD_TIME_HEADER(_key, _value) \
-		{ sprintf(header_buf, "%.06Lf", _value); ADD_HEADER(_key, header_buf); }
+#	define ADD_TIME_HEADER(_key, _value) { \
+			sprintf(header_buf, "%.06Lf", _value); \
+			ADD_HEADER(_key, header_buf); \
+		}
 
-#	define ADD_UNSIGNED_HEADER(_key, _value) \
-		{ sprintf(header_buf, "%u", _value); ADD_HEADER(_key, header_buf); }
+#	define ADD_UNSIGNED_HEADER(_key, _value) { \
+			sprintf(header_buf, "%u", _value); \
+			ADD_HEADER(_key, header_buf); \
+		}
 
 	ADD_TIME_HEADER("X-Timestamp", get_now_real());
 
@@ -406,14 +415,13 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 		}
 		server->run->stream_clients_count += 1;
 
+		if (server->slowdown && server->run->stream_clients_count == 1) {
+			stream_switch_slowdown(server->run->stream, false);
+		}
+
 		evhttp_connection_get_peer(conn, &client_addr, &client_port);
-		LOG_INFO("HTTP: Registered the new stream client: [%s]:%u; id=%s; advance_headers=%s; dual_final_frames=%s; clients now: %u",
-			client_addr,
-			client_port,
-			client->id,
-			bool_to_string(client->advance_headers),
-			bool_to_string(client->dual_final_frames),
-			server->run->stream_clients_count);
+		LOG_INFO("HTTP: Registered the new stream client: [%s]:%u; id=%s; clients now: %u",
+			client_addr, client_port, client->id, server->run->stream_clients_count);
 
 		buf_event = evhttp_connection_get_bufferevent(conn);
 		bufferevent_setcb(buf_event, NULL, NULL, _http_callback_stream_error, (void *)client);
@@ -463,8 +471,8 @@ static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_c
 	// по тем же причинам, по которым у нас нет Content-Length.
 
 #	define ADD_ADVANCE_HEADERS \
-		{ assert(evbuffer_add_printf(buf, \
-		"Content-Type: image/jpeg" RN "X-Timestamp: %.06Lf" RN RN, get_now_real())); }
+		assert(evbuffer_add_printf(buf, \
+			"Content-Type: image/jpeg" RN "X-Timestamp: %.06Lf" RN RN, get_now_real()))
 
 	if (client->need_initial) {
 		assert(evbuffer_add_printf(buf,
@@ -559,20 +567,25 @@ static void _http_callback_stream_error(UNUSED struct bufferevent *buf_event, UN
 	char *client_addr = "???";
 	unsigned short client_port = 0;
 
-	client->server->run->stream_clients_count -= 1;
+#	define RUN(_next) client->server->run->_next
+
+	RUN(stream_clients_count) -= 1;
+	if (client->server->slowdown && RUN(stream_clients_count) <= 0) {
+		stream_switch_slowdown(RUN(stream), true);
+	}
 
 	conn = evhttp_request_get_connection(client->request);
 	if (conn != NULL) {
 		evhttp_connection_get_peer(conn, &client_addr, &client_port);
 	}
 	LOG_INFO("HTTP: Disconnected the stream client: [%s]:%u; clients now: %u",
-		client_addr, client_port, client->server->run->stream_clients_count);
+		client_addr, client_port, RUN(stream_clients_count));
 	if (conn != NULL) {
 		evhttp_connection_free(conn);
 	}
 
 	if (client->prev == NULL) {
-		client->server->run->stream_clients = client->next;
+		RUN(stream_clients) = client->next;
 	} else {
 		client->prev->next = client->next;
 	}
@@ -581,6 +594,8 @@ static void _http_callback_stream_error(UNUSED struct bufferevent *buf_event, UN
 	}
 	free(client->key);
 	free(client);
+
+#	undef RUN
 }
 
 static void _http_queue_send_stream(struct http_server_t *server, bool stream_updated, bool picture_updated) {
@@ -637,12 +652,14 @@ static void _http_exposed_refresh(UNUSED int fd, UNUSED short what, void *v_serv
 	bool stream_updated = false;
 	bool picture_updated = false;
 
-#	define UNLOCK_STREAM \
-		{ server->run->stream->updated = false; A_PTHREAD_M_UNLOCK(&server->run->stream->mutex); }
+#	define UNLOCK_STREAM { \
+			atomic_store(&server->run->stream->updated, false); \
+			A_MUTEX_UNLOCK(&server->run->stream->mutex); \
+		}
 
-	if (server->run->stream->updated) {
+	if (atomic_load(&server->run->stream->updated)) {
 		LOG_DEBUG("Refreshing HTTP exposed ...");
-		A_PTHREAD_M_LOCK(&server->run->stream->mutex);
+		A_MUTEX_LOCK(&server->run->stream->mutex);
 		if (server->run->stream->picture.size > 0) { // If online
 			picture_updated = _expose_new_picture(server);
 			UNLOCK_STREAM;

src/http.h

@@ -85,6 +85,7 @@ struct http_server_t {
 	bool		unix_rm;
 	mode_t		unix_mode;
 	unsigned	drop_same_frames;
+	bool		slowdown;
 	unsigned	fake_width;
 	unsigned	fake_height;
 	unsigned	timeout;

src/main.c

@@ -41,8 +41,8 @@
 #include "http.h"
 
 
-static const char _short_opts[] = "d:i:x:y:m:a:f:z:tb:w:q:c:s:p:u:ro:e:h";
-static const struct option _long_opts[] = {
+static const char _SHORT_OPTS[] = "d:i:x:y:m:a:f:z:ntb:w:q:c:s:p:u:ro:e:lhv";
+static const struct option _LONG_OPTS[] = {
 	{"device",					required_argument,	NULL,	'd'},
 	{"input",					required_argument,	NULL,	'i'},
 	{"width",					required_argument,	NULL,	'x'},
@@ -51,14 +51,14 @@ static const struct option _long_opts[] = {
 	{"tv-standard",				required_argument,	NULL,	'a'},
 	{"desired-fps",				required_argument,	NULL,	'f'},
 	{"min-frame-size",			required_argument,	NULL,	'z'},
+	{"persistent",				no_argument,		NULL,	'n'},
 	{"dv-timings",				no_argument,		NULL,	't'},
 	{"buffers",					required_argument,	NULL,	'b'},
 	{"workers",					required_argument,	NULL,	'w'},
 	{"quality",					required_argument,	NULL,	'q'},
 	{"encoder",					required_argument,	NULL,	'c'},
 	{"device-timeout",			required_argument,	NULL,	1000},
-	{"device-persistent",		no_argument,		NULL,	1001},
-	{"device-error-delay",		required_argument,	NULL,	1002},
+	{"device-error-delay",		required_argument,	NULL,	1001},
 
 	{"brightness",				required_argument,	NULL,	2000},
 	{"brightness-auto",			no_argument,		NULL,	2001},
@@ -80,6 +80,7 @@ static const struct option _long_opts[] = {
 	{"unix-rm",					no_argument,		NULL,	'r'},
 	{"unix-mode",				required_argument,	NULL,	'o'},
 	{"drop-same-frames",		required_argument,	NULL,	'e'},
+	{"slowdown",				no_argument,		NULL,	'l'},
 	{"fake-width",				required_argument,	NULL,	3001},
 	{"fake-height",				required_argument,	NULL,	3002},
 	{"server-timeout",			required_argument,	NULL,	3003},
@@ -89,7 +90,7 @@ static const struct option _long_opts[] = {
 	{"debug",					no_argument,		NULL,	5002},
 	{"log-level",				required_argument,	NULL,	5010},
 	{"help",					no_argument,		NULL,	'h'},
-	{"version",					no_argument,		NULL,	6000},
+	{"version",					no_argument,		NULL,	'v'},
 	{NULL, 0, NULL, 0},
 };
 
@@ -105,76 +106,79 @@ static void _version(bool nl) {
 
 static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_server_t *server) {
 	printf("\nuStreamer - Lightweight and fast MJPG-HTTP streamer\n");
-	printf("===================================================\n\n");
+	printf("═══════════════════════════════════════════════════\n\n");
 	printf("Version: ");
 	_version(false);
 	printf("; license: GPLv3\n");
 	printf("Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com>\n\n");
 	printf("Capturing options:\n");
-	printf("------------------\n");
-	printf("    -d|--device </dev/path>          -- Path to V4L2 device. Default: %s.\n\n", dev->path);
-	printf("    -i|--input <N>                   -- Input channel. Default: %u.\n\n", dev->input);
-	printf("    -x|--width <N>                   -- Initial image width. Default: %u.\n\n", dev->width);
-	printf("    -y|--height <N>                  -- Initial image height. Default: %u.\n\n", dev->height);
-	printf("    -m|--format <fmt>                -- Image format.\n");
-	printf("                                        Available: %s; default: YUYV.\n\n", FORMATS_STR);
-	printf("    -a|--tv-standard <std>           -- Force TV standard.\n");
-	printf("                                        Available: %s; default: disabled.\n\n", STANDARDS_STR);
-	printf("    -f|--desired-fps <N>             -- Desired FPS. Default: maximum as possible.\n\n");
-	printf("    -z|--min-frame-size <N>          -- Drop frames smaller then this limit.\n");
-	printf("                                        Useful if the device produces small-sized garbage frames.\n\n");
-	printf("    -t|--dv-timings                  -- Enable DV timings queriyng and events processing.\n");
-	printf("                                        Supports automatic resolution changing. Default: disabled.\n\n");
-	printf("    -b|--buffers <N>                 -- The number of buffers to receive data from the device.\n");
-	printf("                                        Each buffer may processed using an intermediate thread.\n");
-	printf("                                        Default: %u (number of CPU cores + 1)\n\n", dev->n_buffers);
-	printf("    -w|--workers <N>                 -- The number of compressing threads. Default: %u (== --buffers).\n\n", dev->n_workers);
-	printf("    -q|--quality <N>                 -- Set quality of JPEG encoding from 1 to 100 (best). Default: %u.\n\n", encoder->quality);
-	printf("    -c|--encoder <type>              -- Use specified encoder. It may affects to workers number.\n");
-	printf("                                     -- Available: %s; default: CPU.\n\n", ENCODER_TYPES_STR);
-	printf("    --device-timeout <seconds>       -- Timeout for device querying. Default: %u\n\n", dev->timeout);
-	printf("    --device-persistent              -- Don't re-initialize device on timeout. Default: disabled.\n\n");
-	printf("    --device-error-delay <seconds>   -- Delay before trying to connect to the device again\n");
-	printf("                                        after a timeout. Default: %u\n\n", dev->error_delay);
+	printf("══════════════════\n");
+	printf("    -d|--device </dev/path>  ──────── Path to V4L2 device. Default: %s.\n\n", dev->path);
+	printf("    -i|--input <N>  ───────────────── Input channel. Default: %u.\n\n", dev->input);
+	printf("    -x|--width <N>  ───────────────── Initial image width. Default: %u.\n\n", dev->width);
+	printf("    -y|--height <N>  ──────────────── Initial image height. Default: %u.\n\n", dev->height);
+	printf("    -m|--format <fmt>  ────────────── Image format.\n");
+	printf("                                      Available: %s; default: YUYV.\n\n", FORMATS_STR);
+	printf("    -a|--tv-standard <std>  ───────── Force TV standard.\n");
+	printf("                                      Available: %s; default: disabled.\n\n", STANDARDS_STR);
+	printf("    -f|--desired-fps <N>  ─────────── Desired FPS. Default: maximum as possible.\n\n");
+	printf("    -z|--min-frame-size <N>  ──────── Drop frames smaller then this limit.\n");
+	printf("                                      Useful if the device produces small-sized garbage frames.\n\n");
+	printf("    -n|--persistent  ──────────────── Don't re-initialize device on timeout. Default: disabled.\n\n");
+	printf("    -t|--dv-timings  ──────────────── Enable DV timings queriyng and events processing.\n");
+	printf("                                      Supports automatic resolution changing. Default: disabled.\n\n");
+	printf("    -b|--buffers <N>  ─────────────── The number of buffers to receive data from the device.\n");
+	printf("                                      Each buffer may processed using an intermediate thread.\n");
+	printf("                                      Default: %u (the number of CPU cores (but not more 4) + 1)\n\n", dev->n_buffers);
+	printf("    -w|--workers <N>  ─────────────── The number of worker threads. Default: %u (== --buffers).\n\n", dev->n_workers);
+	printf("    -q|--quality <N>  ─────────────── Set quality of JPEG encoding from 1 to 100 (best). Default: %u.\n\n", encoder->quality);
+	printf("    -c|--encoder <type>  ──────────── Use specified encoder. It may affects to workers number.\n");
+	printf("                                      Available: %s; default: CPU.\n\n", ENCODER_TYPES_STR);
+	printf("    --device-timeout <seconds>  ───── Timeout for device querying. Default: %u\n\n", dev->timeout);
+	printf("    --device-error-delay <seconds>  ─ Delay before trying to connect to the device again\n");
+	printf("                                      after timeout. Default: %u\n\n", dev->error_delay);
 	printf("Image control options:\n");
-	printf("---------------\n");
-	printf("    --brightness <N>             -- Set brightness. Default: no change.\n\n");
-	printf("    --brightness-auto            -- Enable automatic brightness control. Default: no change.\n\n");
-	printf("    --contrast <N>               -- Set contrast. Default: no change.\n\n");
-	printf("    --saturation <N>             -- Set saturation. Default: no change.\n\n");
-	printf("    --hue <N>                    -- Set hue. Default: no change.\n\n");
-	printf("    --hue-auto                   -- Enable automatic hue control. Default: no change.\n\n");
-	printf("    --gamma <N>                  -- Set gamma. Default: no change.\n\n");
-	printf("    --sharpness <N>              -- Set sharpness. Default: no change.\n\n");
-	printf("    --backlight-compensation <N> -- Set backlight compensation. Default: no change.\n\n");
-	printf("    --white-balance <N>          -- Set white balance. Default: no change.\n\n");
-	printf("    --white-balance-auto         -- Enable automatic white balance control. Default: no change.\n\n");
-	printf("    --gain <N>                   -- Set gain. Default: no change.\n\n");
-	printf("    --gain-auto                  -- Enable automatic gain control. Default: no change.\n\n");
+	printf("══════════════════════\n");
+	printf("    --brightness <N>  ───────────── Set brightness. Default: no change.\n\n");
+	printf("    --brightness-auto  ──────────── Enable automatic brightness control. Default: no change.\n\n");
+	printf("    --contrast <N>  ─────────────── Set contrast. Default: no change.\n\n");
+	printf("    --saturation <N>  ───────────── Set saturation. Default: no change.\n\n");
+	printf("    --hue <N>  ──────────────────── Set hue. Default: no change.\n\n");
+	printf("    --hue-auto  ─────────────────── Enable automatic hue control. Default: no change.\n\n");
+	printf("    --gamma <N>  ────────────────── Set gamma. Default: no change.\n\n");
+	printf("    --sharpness <N>  ────────────── Set sharpness. Default: no change.\n\n");
+	printf("    --backlight-compensation <N>  ─ Set backlight compensation. Default: no change.\n\n");
+	printf("    --white-balance <N>  ────────── Set white balance. Default: no change.\n\n");
+	printf("    --white-balance-auto  ───────── Enable automatic white balance control. Default: no change.\n\n");
+	printf("    --gain <N>  ─────────────────── Set gain. Default: no change.\n\n");
+	printf("    --gain-auto  ────────────────── Enable automatic gain control. Default: no change.\n\n");
 	printf("HTTP server options:\n");
-	printf("--------------------\n");
-	printf("    -s|--host <address>        -- Listen on Hostname or IP. Default: %s\n\n", server->host);
-	printf("    -p|--port <N>              -- Bind to this TCP port. Default: %u\n\n", server->port);
-	printf("    -u|--unix <path>           -- Bind to UNIX domain socket. Default: disabled\n\n");
-	printf("    -r|--unix-rm               -- Try to remove old UNIX socket file before binding. Default: disabled\n\n");
-	printf("    -o|--unix-mode <mode>      -- Set UNIX socket file permissions (like 777). Default: disabled\n\n");
-	printf("    -e|--drop-same-frames <N>  -- Don't send same frames to clients, but no more than specified number.\n");
+	printf("════════════════════\n");
+	printf("    -s|--host <address>  ──────── Listen on Hostname or IP. Default: %s\n\n", server->host);
+	printf("    -p|--port <N>  ────────────── Bind to this TCP port. Default: %u\n\n", server->port);
+	printf("    -u|--unix <path>  ─────────── Bind to UNIX domain socket. Default: disabled\n\n");
+	printf("    -r|--unix-rm  ─────────────── Try to remove old UNIX socket file before binding. Default: disabled\n\n");
+	printf("    -o|--unix-mode <mode>  ────── Set UNIX socket file permissions (like 777). Default: disabled\n\n");
+	printf("    -e|--drop-same-frames <N>  ── Don't send same frames to clients, but no more than specified number.\n");
 	printf("                                  It can significantly reduce the outgoing traffic, but will increase\n");
 	printf("                                  the CPU loading. Don't use this option with analog signal sources\n");
 	printf("                                  or webcams, it's useless. Default: disabled.\n\n");
-	printf("    --fake-width <N>           -- Override image width for /state. Default: disabled\n\n");
-	printf("    --fake-height <N>          -- Override image height for /state. Default: disabled.\n\n");
-	printf("    --server-timeout <seconds> -- Timeout for client connections. Default: %u\n\n", server->timeout);
+	printf("    -l|--slowdown  ────────────── Slowdown capturing to 1 FPS or less when no stream clients connected.\n");
+	printf("                                  Useful to reduce CPU cosumption. Default: disabled.\n\n");
+	printf("    --fake-width <N>  ─────────── Override image width for /state. Default: disabled\n\n");
+	printf("    --fake-height <N>  ────────── Override image height for /state. Default: disabled.\n\n");
+	printf("    --server-timeout <seconds>  ─ Timeout for client connections. Default: %u\n\n", server->timeout);
 	printf("Misc options:\n");
-	printf("-------------\n");
-	printf("    --log-level <N> -- Verbosity level of messages from 0 (info) to 3 (debug).\n");
+	printf("═════════════\n");
+	printf("    --log-level <N>  ─ Verbosity level of messages from 0 (info) to 3 (debug).\n");
 	printf("                       Enabling debugging messages can slow down the program.\n");
 	printf("                       Available levels: 0=info, 1=performance, 2=verbose, 3=debug.\n");
 	printf("                       Default: %u.\n\n", log_level);
-	printf("    --perf          -- Enable performance messages (same as --log-level=1). Default: disabled.\n\n");
-	printf("    --verbose       -- Enable verbose messages and lower (same as --log-level=2). Default: disabled.\n\n");
-	printf("    --debug         -- Enable debug messages and lower (same as --log-level=3). Default: disabled.\n\n");
-	printf("    -h|--help       -- Print this messages and exit.\n\n");
+	printf("    --perf  ────────── Enable performance messages (same as --log-level=1). Default: disabled.\n\n");
+	printf("    --verbose  ─────── Enable verbose messages and lower (same as --log-level=2). Default: disabled.\n\n");
+	printf("    --debug  ───────── Enable debug messages and lower (same as --log-level=3). Default: disabled.\n\n");
+	printf("    -h|--help  ─────── Print this text and exit.\n\n");
+	printf("    -v|--version  ──── Print version and exit.\n\n");
 }
 
 static int _parse_options(int argc, char *argv[], struct device_t *dev, struct encoder_t *encoder, struct http_server_t *server) {
@@ -229,7 +233,7 @@ static int _parse_options(int argc, char *argv[], struct device_t *dev, struct e
 	int ch;
 
 	log_level = LOG_LEVEL_INFO;
-	while ((ch = getopt_long(argc, argv, _short_opts, _long_opts, &index)) >= 0) {
+	while ((ch = getopt_long(argc, argv, _SHORT_OPTS, _LONG_OPTS, &index)) >= 0) {
 		switch (ch) {
 			case 'd':	OPT_SET(dev->path, optarg);
 			case 'i':	OPT_UNSIGNED(dev->input, "--input", 0, 128);
@@ -242,14 +246,14 @@ static int _parse_options(int argc, char *argv[], struct device_t *dev, struct e
 			case 'a':	OPT_PARSE(dev->standard, device_parse_standard, STANDARD_UNKNOWN, "TV standard");
 			case 'f':	OPT_UNSIGNED(dev->desired_fps, "--desired-fps", 0, 30);
 			case 'z':	OPT_UNSIGNED(dev->min_frame_size, "--min-frame-size", 0, 8192);
+			case 'n':	OPT_SET(dev->persistent, true);
 			case 't':	OPT_SET(dev->dv_timings, true);
 			case 'b':	OPT_UNSIGNED(dev->n_buffers, "--buffers", 1, 32);
 			case 'w':	OPT_UNSIGNED(dev->n_workers, "--workers", 1, 32);
 			case 'q':	OPT_UNSIGNED(encoder->quality, "--quality", 1, 100);
 			case 'c':	OPT_PARSE(encoder->type, encoder_parse_type, ENCODER_TYPE_UNKNOWN, "encoder type");
 			case 1000:	OPT_UNSIGNED(dev->timeout, "--device-timeout", 1, 60);
-			case 1001:	OPT_SET(dev->persistent, true);
-			case 1002:	OPT_UNSIGNED(dev->error_delay, "--device-error-delay", 1, 60);
+			case 1001:	OPT_UNSIGNED(dev->error_delay, "--device-error-delay", 1, 60);
 
 			case 2000:	OPT_CTL(brightness);
 			case 2001:	OPT_CTL_AUTO(brightness);
@@ -271,6 +275,7 @@ static int _parse_options(int argc, char *argv[], struct device_t *dev, struct e
 			case 'r':	OPT_SET(server->unix_rm, true);
 			case 'o':	OPT_CHMOD(server->unix_mode, "--unix-mode");
 			case 'e':	OPT_UNSIGNED(server->drop_same_frames, "--drop-same-frames", 0, 30);
+			case 3000:	OPT_SET(server->slowdown, true);
 			case 3001:	OPT_UNSIGNED(server->fake_width, "--fake-width", 0, 1920);
 			case 3002:	OPT_UNSIGNED(server->fake_height, "--fake-height", 0, 1200);
 			case 3003:	OPT_UNSIGNED(server->timeout, "--server-timeout", 1, 60);
@@ -280,7 +285,7 @@ static int _parse_options(int argc, char *argv[], struct device_t *dev, struct e
 			case 5002:	OPT_SET(log_level, LOG_LEVEL_DEBUG);
 			case 5010:	OPT_UNSIGNED(log_level, "--log-level", 0, 3);
 			case 'h':	_help(dev, encoder, server); return 1;
-			case 6000:	_version(true); return 1;
+			case 'v':	_version(true); return 1;
 			case 0:		break;
 			default:	_help(dev, encoder, server); return -1;
 		}
@@ -375,10 +380,10 @@ int main(int argc, char *argv[]) {
 		_ctx = &ctx;
 
 		if ((exit_code = http_server_listen(server)) == 0) {
-			A_PTHREAD_CREATE(&stream_loop_tid, _stream_loop_thread, NULL);
-			A_PTHREAD_CREATE(&server_loop_tid, _server_loop_thread, NULL);
-			A_PTHREAD_JOIN(stream_loop_tid);
-			A_PTHREAD_JOIN(server_loop_tid);
+			A_THREAD_CREATE(&stream_loop_tid, _stream_loop_thread, NULL);
+			A_THREAD_CREATE(&server_loop_tid, _server_loop_thread, NULL);
+			A_THREAD_JOIN(server_loop_tid);
+			A_THREAD_JOIN(stream_loop_tid);
 		}
 	}
 

src/stream.c

@@ -20,6 +20,8 @@
 *****************************************************************************/
 
 
+#include <stdatomic.h>
+#include <unistd.h>
 #include <errno.h>
 #include <time.h>
 #include <assert.h>
@@ -40,46 +42,48 @@
 static long double _stream_get_fluency_delay(struct device_t *dev, struct workers_pool_t *pool);
 static void _stream_expose_picture(struct stream_t *stream, unsigned buf_index);
 
-static int _stream_init_loop(struct device_t *dev, struct workers_pool_t *pool);
-static int _stream_init(struct device_t *dev, struct workers_pool_t *pool);
+static int _stream_init_loop(struct stream_t *stream, struct workers_pool_t *pool);
+static int _stream_init(struct stream_t *stream, struct workers_pool_t *pool);
 
-static void _stream_init_workers(struct device_t *dev, struct workers_pool_t *pool);
-static void *_stream_worker_thread(void *v_ctx);
-static void _stream_destroy_workers(struct device_t *dev, struct workers_pool_t *pool);
-
-static int _stream_control(struct device_t *dev, bool enable);
-static int _stream_grab_buffer(struct device_t *dev, struct v4l2_buffer *buf_info);
-static int _stream_release_buffer(struct device_t *dev, struct v4l2_buffer *buf_info);
-static int _stream_handle_event(struct device_t *dev);
+static void _stream_init_workers(struct stream_t *stream, struct workers_pool_t *pool);
+static void *_stream_worker_thread(void *v_worker);
+static void _stream_destroy_workers(struct stream_t *stream, struct workers_pool_t *pool);
 
 
 struct stream_t *stream_init(struct device_t *dev, struct encoder_t *encoder) {
+	struct process_t *proc;
 	struct stream_t *stream;
 
+	A_CALLOC(proc, 1);
+	atomic_init(&proc->stop, false);
+	atomic_init(&proc->slowdown, false);
+
 	A_CALLOC(stream, 1);
 	stream->dev = dev;
 	stream->encoder = encoder;
-	A_PTHREAD_M_INIT(&stream->mutex);
+	atomic_init(&stream->updated, false);
+	A_MUTEX_INIT(&stream->mutex);
+	stream->proc = proc;
 	return stream;
 }
 
 void stream_destroy(struct stream_t *stream) {
-	A_PTHREAD_M_DESTROY(&stream->mutex);
+	A_MUTEX_DESTROY(&stream->mutex);
+	free(stream->proc);
 	free(stream);
 }
 
 void stream_loop(struct stream_t *stream) {
 	struct workers_pool_t pool;
-	bool workers_stop;
 
 	MEMSET_ZERO(pool);
+	atomic_init(&pool.workers_stop, false);
 	pool.encoder = stream->encoder;
-	pool.workers_stop = &workers_stop;
 
 	LOG_INFO("Using V4L2 device: %s", stream->dev->path);
 	LOG_INFO("Using desired FPS: %u", stream->dev->desired_fps);
 
-	while (_stream_init_loop(stream->dev, &pool) == 0) {
+	while (_stream_init_loop(stream, &pool) == 0) {
 		struct worker_t *oldest_worker = NULL;
 		struct worker_t *last_worker = NULL;
 		long double grab_after = 0;
@@ -93,31 +97,31 @@ void stream_loop(struct stream_t *stream) {
 
 		LOG_INFO("Capturing ...");
 
-		while (!stream->dev->stop) {
+		while (!atomic_load(&stream->proc->stop)) {
 			int free_worker_number = -1;
 
 			SEP_DEBUG('-');
 
 			LOG_DEBUG("Waiting for workers ...");
-			A_PTHREAD_M_LOCK(&pool.free_workers_mutex);
-			A_PTHREAD_C_WAIT_TRUE(pool.free_workers, &pool.free_workers_cond, &pool.free_workers_mutex);
-			A_PTHREAD_M_UNLOCK(&pool.free_workers_mutex);
+			A_MUTEX_LOCK(&pool.free_workers_mutex);
+			A_COND_WAIT_TRUE(pool.free_workers, &pool.free_workers_cond, &pool.free_workers_mutex);
+			A_MUTEX_UNLOCK(&pool.free_workers_mutex);
 
-			if (oldest_worker && !oldest_worker->has_job && oldest_worker->ctx.buf_index >= 0) {
+			if (oldest_worker && !atomic_load(&oldest_worker->has_job) && oldest_worker->buf_index >= 0) {
 				if (oldest_worker->job_failed) {
 					break;
 				}
 
-				_stream_expose_picture(stream, oldest_worker->ctx.buf_index);
+				_stream_expose_picture(stream, oldest_worker->buf_index);
 
-				free_worker_number = oldest_worker->ctx.number;
+				free_worker_number = oldest_worker->number;
 				oldest_worker = oldest_worker->order_next;
 
 				LOG_PERF("##### Raw frame accepted; worker = %u", free_worker_number);
 			} else {
 				for (unsigned number = 0; number < stream->dev->n_workers; ++number) {
 					if (
-						!pool.workers[number].has_job && (
+						!atomic_load(&pool.workers[number].has_job) && (
 							free_worker_number == -1
 							|| pool.workers[free_worker_number].job_start_time < pool.workers[number].job_start_time
 						)
@@ -128,15 +132,19 @@ void stream_loop(struct stream_t *stream) {
 				}
 
 				assert(free_worker_number >= 0);
-				assert(!pool.workers[free_worker_number].has_job);
+				assert(!atomic_load(&pool.workers[free_worker_number].has_job));
 
 				LOG_PERF("----- Raw frame dropped;  worker = %u", free_worker_number);
 			}
 
-			if (stream->dev->stop) {
+			if (atomic_load(&stream->proc->stop)) {
 				break;
 			}
 
+			if (atomic_load(&stream->proc->slowdown)) {
+				usleep(1000000);
+			}
+
 #			define INIT_FD_SET(_set) \
 				fd_set _set; FD_ZERO(&_set); FD_SET(stream->dev->run->fd, &_set);
 
@@ -182,7 +190,7 @@ void stream_loop(struct stream_t *stream) {
 					long double now = get_now_monotonic();
 					long long now_second = floor_ms(now);
 
-					if (_stream_grab_buffer(stream->dev, &buf_info) < 0) {
+					if (device_grab_buffer(stream->dev, &buf_info) < 0) {
 						break;
 					}
 					stream->dev->run->pictures[buf_info.index].grab_time = now;
@@ -222,7 +230,7 @@ void stream_loop(struct stream_t *stream) {
 #					define FREE_WORKER(_next) pool.workers[free_worker_number]._next
 
 					LOG_DEBUG("Grabbed a new frame to buffer %u", buf_info.index);
-					FREE_WORKER(ctx.buf_info) = buf_info;
+					FREE_WORKER(buf_info) = buf_info;
 
 					if (!oldest_worker) {
 						oldest_worker = &pool.workers[free_worker_number];
@@ -240,23 +248,23 @@ void stream_loop(struct stream_t *stream) {
 					}
 					last_worker->order_next = NULL;
 
-					A_PTHREAD_M_LOCK(&FREE_WORKER(has_job_mutex));
-					FREE_WORKER(ctx.buf_index) = buf_info.index;
-					FREE_WORKER(has_job) = true;
-					A_PTHREAD_M_UNLOCK(&FREE_WORKER(has_job_mutex));
-					A_PTHREAD_C_SIGNAL(&FREE_WORKER(has_job_cond));
+					A_MUTEX_LOCK(&FREE_WORKER(has_job_mutex));
+					FREE_WORKER(buf_index) = buf_info.index;
+					atomic_store(&FREE_WORKER(has_job), true);
+					A_MUTEX_UNLOCK(&FREE_WORKER(has_job_mutex));
+					A_COND_SIGNAL(&FREE_WORKER(has_job_cond));
 
 #					undef FREE_WORKER
 
-					A_PTHREAD_M_LOCK(&pool.free_workers_mutex);
+					A_MUTEX_LOCK(&pool.free_workers_mutex);
 					pool.free_workers -= 1;
-					A_PTHREAD_M_UNLOCK(&pool.free_workers_mutex);
+					A_MUTEX_UNLOCK(&pool.free_workers_mutex);
 
 					goto next_handlers; // Поток сам освободит буфер
 
 					pass_frame:
 
-					if (_stream_release_buffer(stream->dev, &buf_info) < 0) {
+					if (device_release_buffer(stream->dev, &buf_info) < 0) {
 						break;
 					}
 				}
@@ -270,35 +278,39 @@ void stream_loop(struct stream_t *stream) {
 
 				if (FD_ISSET(stream->dev->run->fd, &error_fds)) {
 					LOG_INFO("Got V4L2 event");
-					if (_stream_handle_event(stream->dev) < 0) {
+					if (device_consume_event(stream->dev) < 0) {
 						break;
 					}
 				}
 			}
 		}
 
-		A_PTHREAD_M_LOCK(&stream->mutex);
+		A_MUTEX_LOCK(&stream->mutex);
 		stream->picture.size = 0; // On stream offline
 		free(stream->picture.data);
 		stream->width = 0;
 		stream->height = 0;
-		stream->updated = true;
-		A_PTHREAD_M_UNLOCK(&stream->mutex);
+		atomic_store(&stream->updated, true);
+		A_MUTEX_UNLOCK(&stream->mutex);
 	}
 
-	_stream_destroy_workers(stream->dev, &pool);
-	_stream_control(stream->dev, false);
+	_stream_destroy_workers(stream, &pool);
+	device_switch_capturing(stream->dev, false);
 	device_close(stream->dev);
 }
 
 void stream_loop_break(struct stream_t *stream) {
-	stream->dev->stop = 1;
+	atomic_store(&stream->proc->stop, true);
+}
+
+void stream_switch_slowdown(struct stream_t *stream, bool slowdown) {
+	atomic_store(&stream->proc->slowdown, slowdown);
 }
 
 static void _stream_expose_picture(struct stream_t *stream, unsigned buf_index) {
 #	define PICTURE(_next) stream->dev->run->pictures[buf_index]._next
 
-	A_PTHREAD_M_LOCK(&stream->mutex);
+	A_MUTEX_LOCK(&stream->mutex);
 
 	stream->picture.size = PICTURE(size);
 	stream->picture.allocated = PICTURE(allocated);
@@ -311,9 +323,9 @@ static void _stream_expose_picture(struct stream_t *stream, unsigned buf_index)
 
 	stream->width = stream->dev->run->width;
 	stream->height = stream->dev->run->height;
-	stream->updated = true;
+	atomic_store(&stream->updated, true);
 
-	A_PTHREAD_M_UNLOCK(&stream->mutex);
+	A_MUTEX_UNLOCK(&stream->mutex);
 
 #	undef PICTURE
 }
@@ -327,11 +339,11 @@ static long double _stream_get_fluency_delay(struct device_t *dev, struct worker
 	for (unsigned number = 0; number < dev->n_workers; ++number) {
 #		define WORKER(_next) pool->workers[number]._next
 
-		A_PTHREAD_M_LOCK(&WORKER(last_comp_time_mutex));
+		A_MUTEX_LOCK(&WORKER(last_comp_time_mutex));
 		if (WORKER(last_comp_time) > 0) {
 			sum_comp_time += WORKER(last_comp_time);
 		}
-		A_PTHREAD_M_UNLOCK(&WORKER(last_comp_time_mutex));
+		A_MUTEX_UNLOCK(&WORKER(last_comp_time_mutex));
 
 #		undef WORKER
 	}
@@ -348,14 +360,14 @@ static long double _stream_get_fluency_delay(struct device_t *dev, struct worker
 	return min_delay;
 }
 
-static int _stream_init_loop(struct device_t *dev, struct workers_pool_t *pool) {
+static int _stream_init_loop(struct stream_t *stream, struct workers_pool_t *pool) {
 	int retval = -1;
 
-	LOG_DEBUG("%s: *dev->stop = %d", __FUNCTION__, dev->stop);
-	while (!dev->stop) {
-		if ((retval = _stream_init(dev, pool)) < 0) {
-			LOG_INFO("Sleeping %u seconds before new stream init ...", dev->error_delay);
-			sleep(dev->error_delay);
+	LOG_DEBUG("%s: stream->proc->stop = %d", __FUNCTION__, atomic_load(&stream->proc->stop));
+	while (!atomic_load(&stream->proc->stop)) {
+		if ((retval = _stream_init(stream, pool)) < 0) {
+			LOG_INFO("Sleeping %u seconds before new stream init ...", stream->dev->error_delay);
+			sleep(stream->dev->error_delay);
 		} else {
 			break;
 		}
@@ -363,218 +375,143 @@ static int _stream_init_loop(struct device_t *dev, struct workers_pool_t *pool)
 	return retval;
 }
 
-static int _stream_init(struct device_t *dev, struct workers_pool_t *pool) {
+static int _stream_init(struct stream_t *stream, struct workers_pool_t *pool) {
 	SEP_INFO('=');
 
-	_stream_destroy_workers(dev, pool);
-	_stream_control(dev, false);
-	device_close(dev);
+	_stream_destroy_workers(stream, pool);
+	device_switch_capturing(stream->dev, false);
+	device_close(stream->dev);
 
-	if (device_open(dev) < 0) {
+	if (device_open(stream->dev) < 0) {
 		goto error;
 	}
-	if (_stream_control(dev, true) < 0) {
+	if (device_switch_capturing(stream->dev, true) < 0) {
 		goto error;
 	}
 
-	encoder_prepare_live(pool->encoder, dev);
+	encoder_prepare_live(pool->encoder, stream->dev);
 
-	_stream_init_workers(dev, pool);
+	_stream_init_workers(stream, pool);
 
 	return 0;
 
 	error:
-		device_close(dev);
+		device_close(stream->dev);
 		return -1;
 }
 
-static void _stream_init_workers(struct device_t *dev, struct workers_pool_t *pool) {
-	LOG_INFO("Spawning %u workers ...", dev->n_workers);
+static void _stream_init_workers(struct stream_t *stream, struct workers_pool_t *pool) {
+	LOG_INFO("Spawning %u workers ...", stream->dev->n_workers);
 
-	*pool->workers_stop = false;
-	A_CALLOC(pool->workers, dev->n_workers);
+	atomic_store(&pool->workers_stop, false);
+	A_CALLOC(pool->workers, stream->dev->n_workers);
 
-	A_PTHREAD_M_INIT(&pool->free_workers_mutex);
-	A_PTHREAD_C_INIT(&pool->free_workers_cond);
+	A_MUTEX_INIT(&pool->free_workers_mutex);
+	A_COND_INIT(&pool->free_workers_cond);
 
-	for (unsigned number = 0; number < dev->n_workers; ++number) {
+	for (unsigned number = 0; number < stream->dev->n_workers; ++number) {
 #		define WORKER(_next)	pool->workers[number]._next
-#		define CTX(_next)		WORKER(ctx._next)
 
 		pool->free_workers += 1;
 
-		A_PTHREAD_M_INIT(&WORKER(has_job_mutex));
-		A_PTHREAD_C_INIT(&WORKER(has_job_cond));
+		A_MUTEX_INIT(&WORKER(has_job_mutex));
+		atomic_init(&WORKER(has_job), false);
+		A_COND_INIT(&WORKER(has_job_cond));
 
-		CTX(number)			= number;
-		CTX(dev)			= dev;
-		CTX(dev_stop)		= (sig_atomic_t *volatile)&dev->stop;
-		CTX(workers_stop)	= pool->workers_stop;
+		WORKER(number)			= number;
+		WORKER(proc_stop)		= &stream->proc->stop;
+		WORKER(workers_stop)	= &pool->workers_stop;
 
-		CTX(encoder) = pool->encoder;
+		WORKER(free_workers_mutex)	= &pool->free_workers_mutex;
+		WORKER(free_workers)		= &pool->free_workers;
+		WORKER(free_workers_cond)	= &pool->free_workers_cond;
 
-		CTX(last_comp_time_mutex)	= &WORKER(last_comp_time_mutex);
-		CTX(last_comp_time)			= &WORKER(last_comp_time);
+		WORKER(dev)		= stream->dev;
+		WORKER(encoder)	= pool->encoder;
 
-		CTX(has_job_mutex)	= &WORKER(has_job_mutex);
-		CTX(has_job)		= &WORKER(has_job);
-		CTX(job_failed)		= &WORKER(job_failed);
-		CTX(job_start_time)	= &WORKER(job_start_time);
-		CTX(has_job_cond)	= &WORKER(has_job_cond);
+		A_THREAD_CREATE(&WORKER(tid), _stream_worker_thread, (void *)&(pool->workers[number]));
 
-		CTX(free_workers_mutex)	= &pool->free_workers_mutex;
-		CTX(free_workers)		= &pool->free_workers;
-		CTX(free_workers_cond)	= &pool->free_workers_cond;
-
-		A_PTHREAD_CREATE(&WORKER(tid), _stream_worker_thread, (void *)&WORKER(ctx));
-
-#		undef CTX
 #		undef WORKER
 	}
 }
 
-static void *_stream_worker_thread(void *v_ctx) {
-	struct worker_context_t *ctx = (struct worker_context_t *)v_ctx;
+static void *_stream_worker_thread(void *v_worker) {
+	struct worker_t *worker = (struct worker_t *)v_worker;
 
-	LOG_DEBUG("Hello! I am a worker #%u ^_^", ctx->number);
+	LOG_DEBUG("Hello! I am a worker #%u ^_^", worker->number);
 
-	while (!*ctx->dev_stop && !*ctx->workers_stop) {
-		LOG_DEBUG("Worker %u waiting for a new job ...", ctx->number);
-		A_PTHREAD_M_LOCK(ctx->has_job_mutex);
-		A_PTHREAD_C_WAIT_TRUE(*ctx->has_job, ctx->has_job_cond, ctx->has_job_mutex);
-		A_PTHREAD_M_UNLOCK(ctx->has_job_mutex);
+	while (!atomic_load(worker->proc_stop) && !atomic_load(worker->workers_stop)) {
+		LOG_DEBUG("Worker %u waiting for a new job ...", worker->number);
+		A_MUTEX_LOCK(&worker->has_job_mutex);
+		A_COND_WAIT_TRUE(atomic_load(&worker->has_job), &worker->has_job_cond, &worker->has_job_mutex);
+		A_MUTEX_UNLOCK(&worker->has_job_mutex);
 
-		if (!*ctx->workers_stop) {
-#			define PICTURE(_next) ctx->dev->run->pictures[ctx->buf_index]._next
+		if (!atomic_load(worker->workers_stop)) {
+#			define PICTURE(_next) worker->dev->run->pictures[worker->buf_index]._next
 
-			LOG_DEBUG("Worker %u compressing JPEG from buffer %u ...", ctx->number, ctx->buf_index);
+			LOG_DEBUG("Worker %u compressing JPEG from buffer %u ...", worker->number, worker->buf_index);
 
 			PICTURE(encode_begin_time) = get_now_monotonic();
-			if (encoder_compress_buffer(ctx->encoder, ctx->dev, ctx->number, ctx->buf_index) < 0) {
-				*ctx->job_failed = true;
+			if (encoder_compress_buffer(worker->encoder, worker->dev, worker->number, worker->buf_index) < 0) {
+				worker->job_failed = true;
 			}
 			PICTURE(encode_end_time) = get_now_monotonic();
 
-			if (_stream_release_buffer(ctx->dev, &ctx->buf_info) == 0) {
-				*ctx->job_start_time = PICTURE(encode_begin_time);
-				*ctx->has_job = false;
+			if (device_release_buffer(worker->dev, &worker->buf_info) == 0) {
+				worker->job_start_time = PICTURE(encode_begin_time);
+				atomic_store(&worker->has_job, false);
 
-				long double last_comp_time = PICTURE(encode_end_time) - *ctx->job_start_time;
+				long double last_comp_time = PICTURE(encode_end_time) - worker->job_start_time;
 
-				A_PTHREAD_M_LOCK(ctx->last_comp_time_mutex);
-				*ctx->last_comp_time = last_comp_time;
-				A_PTHREAD_M_UNLOCK(ctx->last_comp_time_mutex);
+				A_MUTEX_LOCK(&worker->last_comp_time_mutex);
+				worker->last_comp_time = last_comp_time;
+				A_MUTEX_UNLOCK(&worker->last_comp_time_mutex);
 
 				LOG_VERBOSE("Compressed JPEG size=%zu; time=%0.3Lf; worker=%u; buffer=%u",
-					PICTURE(size), last_comp_time, ctx->number, ctx->buf_index);
+					PICTURE(size), last_comp_time, worker->number, worker->buf_index);
 			} else {
-				*ctx->job_failed = true;
-				*ctx->has_job = false;
+				worker->job_failed = true;
+				atomic_store(&worker->has_job, false);
 			}
 
 #			undef PICTURE
 		}
 
-		A_PTHREAD_M_LOCK(ctx->free_workers_mutex);
-		*ctx->free_workers += 1;
-		A_PTHREAD_M_UNLOCK(ctx->free_workers_mutex);
-		A_PTHREAD_C_SIGNAL(ctx->free_workers_cond);
+		A_MUTEX_LOCK(worker->free_workers_mutex);
+		*worker->free_workers += 1;
+		A_MUTEX_UNLOCK(worker->free_workers_mutex);
+		A_COND_SIGNAL(worker->free_workers_cond);
 	}
 
-	LOG_DEBUG("Bye-bye (worker %u)", ctx->number);
+	LOG_DEBUG("Bye-bye (worker %u)", worker->number);
 	return NULL;
 }
 
-static void _stream_destroy_workers(struct device_t *dev, struct workers_pool_t *pool) {
+static void _stream_destroy_workers(struct stream_t *stream, struct workers_pool_t *pool) {
 	if (pool->workers) {
 		LOG_INFO("Destroying workers ...");
 
-		*pool->workers_stop = true;
-		for (unsigned number = 0; number < dev->n_workers; ++number) {
+		atomic_store(&pool->workers_stop, true);
+		for (unsigned number = 0; number < stream->dev->n_workers; ++number) {
 #			define WORKER(_next) pool->workers[number]._next
 
-			A_PTHREAD_M_LOCK(&WORKER(has_job_mutex));
-			WORKER(has_job) = true; // Final job: die
-			A_PTHREAD_M_UNLOCK(&WORKER(has_job_mutex));
-			A_PTHREAD_C_SIGNAL(&WORKER(has_job_cond));
+			A_MUTEX_LOCK(&WORKER(has_job_mutex));
+			atomic_store(&WORKER(has_job), true); // Final job: die
+			A_MUTEX_UNLOCK(&WORKER(has_job_mutex));
+			A_COND_SIGNAL(&WORKER(has_job_cond));
 
-			A_PTHREAD_JOIN(WORKER(tid));
-			A_PTHREAD_M_DESTROY(&WORKER(has_job_mutex));
-			A_PTHREAD_C_DESTROY(&WORKER(has_job_cond));
+			A_THREAD_JOIN(WORKER(tid));
+			A_MUTEX_DESTROY(&WORKER(has_job_mutex));
+			A_COND_DESTROY(&WORKER(has_job_cond));
 
 #			undef WORKER
 		}
 
-		A_PTHREAD_M_DESTROY(&pool->free_workers_mutex);
-		A_PTHREAD_C_DESTROY(&pool->free_workers_cond);
+		A_MUTEX_DESTROY(&pool->free_workers_mutex);
+		A_COND_DESTROY(&pool->free_workers_cond);
 
 		free(pool->workers);
 	}
 	pool->free_workers = 0;
 	pool->workers = NULL;
 }
-
-static int _stream_control(struct device_t *dev, bool enable) {
-	if (enable != dev->run->capturing) {
-		enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
-		LOG_DEBUG("Calling ioctl(%s) ...", (enable ? "VIDIOC_STREAMON" : "VIDIOC_STREAMOFF"));
-		if (xioctl(dev->run->fd, (enable ? VIDIOC_STREAMON : VIDIOC_STREAMOFF), &type) < 0) {
-			LOG_PERROR("Unable to %s capturing", (enable ? "start" : "stop"));
-			if (enable) {
-				return -1;
-			}
-		}
-
-		dev->run->capturing = enable;
-		LOG_INFO("Capturing %s", (enable ? "started" : "stopped"));
-	}
-    return 0;
-}
-
-static int _stream_grab_buffer(struct device_t *dev, struct v4l2_buffer *buf_info) {
-	MEMSET_ZERO_PTR(buf_info);
-	buf_info->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	buf_info->memory = V4L2_MEMORY_MMAP;
-
-	LOG_DEBUG("Calling ioctl(VIDIOC_DQBUF) ...");
-	if (xioctl(dev->run->fd, VIDIOC_DQBUF, buf_info) < 0) {
-		LOG_PERROR("Unable to dequeue buffer");
-		return -1;
-	}
-
-	LOG_DEBUG("Got a new frame in buffer index=%u; bytesused=%u", buf_info->index, buf_info->bytesused);
-	if (buf_info->index >= dev->run->n_buffers) {
-		LOG_ERROR("Got invalid buffer index=%u; nbuffers=%u", buf_info->index, dev->run->n_buffers);
-		return -1;
-	}
-	return 0;
-}
-
-static int _stream_release_buffer(struct device_t *dev, struct v4l2_buffer *buf_info) {
-	LOG_DEBUG("Calling ioctl(VIDIOC_QBUF) ...");
-	if (xioctl(dev->run->fd, VIDIOC_QBUF, buf_info) < 0) {
-		LOG_PERROR("Unable to requeue buffer");
-		return -1;
-	}
-	return 0;
-}
-
-static int _stream_handle_event(struct device_t *dev) {
-	struct v4l2_event event;
-
-	LOG_DEBUG("Calling ioctl(VIDIOC_DQEVENT) ...");
-	if (!xioctl(dev->run->fd, VIDIOC_DQEVENT, &event)) {
-		switch (event.type) {
-			case V4L2_EVENT_SOURCE_CHANGE:
-				LOG_INFO("Got V4L2_EVENT_SOURCE_CHANGE: source changed");
-				return -1;
-			case V4L2_EVENT_EOS:
-				LOG_INFO("Got V4L2_EVENT_EOS: end of stream (ignored)");
-				return 0;
-		}
-	} else {
-		LOG_PERROR("Got some V4L2 device event, but where is it? ");
-	}
-	return 0;
-}

src/stream.h

@@ -23,7 +23,7 @@
 #pragma once
 
 #include <stdbool.h>
-#include <signal.h>
+#include <stdatomic.h>
 
 #include <pthread.h>
 
@@ -31,50 +31,37 @@
 #include "encoder.h"
 
 
-struct worker_context_t {
+struct worker_t {
+	pthread_t			tid;
 	unsigned			number;
-	struct device_t		*dev;
+	atomic_bool			*proc_stop;
+	atomic_bool			*workers_stop;
+
+	pthread_mutex_t		last_comp_time_mutex;
+	long double			last_comp_time;
+
+	pthread_mutex_t		has_job_mutex;
 	int					buf_index;
 	struct v4l2_buffer	buf_info;
-	sig_atomic_t		*volatile dev_stop;
-	bool				*workers_stop;
-
-	struct encoder_t	*encoder;
-
-	pthread_mutex_t		*last_comp_time_mutex;
-	long double			*last_comp_time;
-
-	pthread_mutex_t		*has_job_mutex;
-	bool				*has_job;
-	bool				*job_failed;
-	long double			*job_start_time;
-	pthread_cond_t		*has_job_cond;
+	atomic_bool			has_job;
+	bool				job_failed;
+	long double			job_start_time;
+	pthread_cond_t		has_job_cond;
 
 	pthread_mutex_t		*free_workers_mutex;
 	unsigned			*free_workers;
 	pthread_cond_t		*free_workers_cond;
-};
 
-struct worker_t {
-	struct worker_context_t	ctx;
-	pthread_t				tid;
+	struct worker_t		*order_prev;
+	struct worker_t		*order_next;
 
-	pthread_mutex_t			last_comp_time_mutex;
-	long double				last_comp_time;
-
-	pthread_mutex_t			has_job_mutex;
-	bool					has_job;
-	bool					job_failed;
-	long double				job_start_time;
-	pthread_cond_t			has_job_cond;
-
-	struct worker_t			*order_prev;
-	struct worker_t			*order_next;
+	struct device_t		*dev;
+	struct encoder_t	*encoder;
 };
 
 struct workers_pool_t {
 	struct worker_t		*workers;
-	bool				*workers_stop;
+	atomic_bool			workers_stop;
 
 	pthread_mutex_t		free_workers_mutex;
 	unsigned			free_workers;
@@ -83,13 +70,20 @@ struct workers_pool_t {
 	struct encoder_t	*encoder;
 };
 
+struct process_t {
+	atomic_bool stop;
+	atomic_bool slowdown;
+};
+
 struct stream_t {
 	struct picture_t	picture;
 	unsigned			width;
 	unsigned			height;
 	unsigned			captured_fps;
-	bool				updated;
+	atomic_bool			updated;
 	pthread_mutex_t		mutex;
+
+	struct process_t	*proc;
 	struct device_t		*dev;
 	struct encoder_t	*encoder;
 };
@@ -100,3 +94,4 @@ void stream_destroy(struct stream_t *stream);
 
 void stream_loop(struct stream_t *stream);
 void stream_loop_break(struct stream_t *stream);
+void stream_switch_slowdown(struct stream_t *stream, bool slowdown);

src/tools.h

@@ -35,18 +35,18 @@
 #include <sys/syscall.h>
 
 
-#define A_PTHREAD_CREATE(_tid, _func, _arg)	assert(!pthread_create(_tid, NULL, _func, _arg))
-#define A_PTHREAD_JOIN(_tid)				assert(!pthread_join(_tid, NULL))
+#define A_THREAD_CREATE(_tid, _func, _arg)	assert(!pthread_create(_tid, NULL, _func, _arg))
+#define A_THREAD_JOIN(_tid)					assert(!pthread_join(_tid, NULL))
 
-#define A_PTHREAD_M_INIT(_mutex)	assert(!pthread_mutex_init(_mutex, NULL))
-#define A_PTHREAD_M_DESTROY(_mutex)	assert(!pthread_mutex_destroy(_mutex))
-#define A_PTHREAD_M_LOCK(_mutex)	assert(!pthread_mutex_lock(_mutex))
-#define A_PTHREAD_M_UNLOCK(_mutex)	assert(!pthread_mutex_unlock(_mutex))
+#define A_MUTEX_INIT(_mutex)	assert(!pthread_mutex_init(_mutex, NULL))
+#define A_MUTEX_DESTROY(_mutex)	assert(!pthread_mutex_destroy(_mutex))
+#define A_MUTEX_LOCK(_mutex)	assert(!pthread_mutex_lock(_mutex))
+#define A_MUTEX_UNLOCK(_mutex)	assert(!pthread_mutex_unlock(_mutex))
 
-#define A_PTHREAD_C_INIT(_cond)		assert(!pthread_cond_init(_cond, NULL))
-#define A_PTHREAD_C_DESTROY(_cond)	assert(!pthread_cond_destroy(_cond))
-#define A_PTHREAD_C_SIGNAL(...)		assert(!pthread_cond_signal(__VA_ARGS__))
-#define A_PTHREAD_C_WAIT_TRUE(_var, _cond, _mutex) { while(!_var) assert(!pthread_cond_wait(_cond, _mutex)); }
+#define A_COND_INIT(_cond)		assert(!pthread_cond_init(_cond, NULL))
+#define A_COND_DESTROY(_cond)	assert(!pthread_cond_destroy(_cond))
+#define A_COND_SIGNAL(...)		assert(!pthread_cond_signal(__VA_ARGS__))
+#define A_COND_WAIT_TRUE(_var, _cond, _mutex) { while(!_var) assert(!pthread_cond_wait(_cond, _mutex)); }
 
 #define A_CALLOC(_dest, _nmemb)		assert((_dest = calloc(_nmemb, sizeof(*(_dest)))))
 #define A_REALLOC(_dest, _nmemb)	assert((_dest = realloc(_dest, _nmemb * sizeof(*(_dest)))))
@@ -63,12 +63,16 @@ INLINE char *bool_to_string(bool flag) {
 	return (flag ? "true" : "false");
 }
 
+INLINE unsigned min_u(unsigned a, unsigned b) {
+	return (a < b ? a : b);
+}
+
 INLINE unsigned max_u(unsigned a, unsigned b) {
 	return (a > b ? a : b);
 }
 
 INLINE long long floor_ms(long double now) {
-	return (long long) now - (now < (long long) now); // floor()
+	return (long long)now - (now < (long long)now); // floor()
 }
 
 INLINE void get_now(clockid_t clk_id, time_t *sec, long *msec) {