Bump version: 6.45 → 6.46

An alternative implementation of pikvm/ustreamer#304.
Thanks for the idea.

.bumpversion.cfg

@@ -1,7 +1,7 @@
 [bumpversion]
 commit = True
 tag = True
-current_version = 6.32
+current_version = 6.46
 parse = (?P<major>\d+)\.(?P<minor>\d+)
 serialize = 
 	{major}.{minor}

README.md

@@ -11,7 +11,7 @@
 |----------|---------------|-------------------|
 | Multithreaded JPEG encoding | ✔ | ✘ |
 | Hardware image encoding<br>on Raspberry Pi | ✔ | ✘ |
-| Behavior when the device<br>is disconnected while streaming | ✔ Shows a black screen<br>with ```NO SIGNAL``` on it<br>until reconnected | ✘ Stops the streaming <sup>1</sup> |
+| Behavior when the device<br>is disconnected while streaming | ✔ Shows a black screen<br>with ```NO LIVE VIDEO``` on it<br>until reconnected | ✘ Stops the streaming <sup>1</sup> |
 | [DV-timings](https://linuxtv.org/downloads/v4l-dvb-apis-new/userspace-api/v4l/dv-timings.html) support -<br>the ability to change resolution<br>on the fly by source signal | ✔ | ☹ Partially yes <sup>1</sup> |
 | Option to skip frames when streaming<br>static images by HTTP to save the traffic | ✔ <sup>2</sup> | ✘ |
 | Streaming via UNIX domain socket | ✔ | ✘ |
@@ -44,7 +44,7 @@ You need to download the µStreamer onto your system and build it from the sourc
 * FreeBSD port: https://www.freshports.org/multimedia/ustreamer.
 
 ### Preconditions
-You'll need  ```make```, ```gcc```, ```libevent``` with ```pthreads``` support, ```libjpeg9```/```libjpeg-turbo``` and ```libbsd``` (only for Linux).
+You'll need  ```make```, ```gcc```, ```pkg-config```, ```libevent``` with ```pthreads``` support, ```libjpeg9```/```libjpeg-turbo``` and ```libbsd``` (only for Linux).
 
 * Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
 * Raspberry OS Bullseye: `sudo apt install libevent-dev libjpeg62-turbo libbsd-dev`. Add `libgpiod-dev` for `WITH_GPIO=1` and `libsystemd-dev` for `WITH_SYSTEMD=1` and `libasound2-dev libspeex-dev libspeexdsp-dev libopus-dev` for `WITH_JANUS=1`.

janus/Makefile

@@ -10,14 +10,19 @@ LDFLAGS ?=
 # =====
 _PLUGIN = libjanus_ustreamer.so
 
-_CFLAGS = -fPIC -MD -c -std=c17 -Wall -Wextra -D_GNU_SOURCE $(shell $(PKG_CONFIG) --cflags glib-2.0) $(CFLAGS)
-_LDFLAGS = -shared -lm -pthread -lrt -ljansson -lopus -lasound -lspeexdsp $(shell $(PKG_CONFIG) --libs glib-2.0) $(LDFLAGS)
+_CFLAGS = -fPIC -MD -c -std=c17 -Wall -Wextra -D_GNU_SOURCE $(shell $(PKG_CONFIG) --cflags janus-gateway) $(CFLAGS)
+_LDFLAGS = -shared -lm -pthread -lrt -ljansson -lopus -lasound -lspeexdsp $(shell $(PKG_CONFIG) --libs janus-gateway) $(LDFLAGS)
 
 _SRCS = $(shell ls src/uslibs/*.c src/*.c)
 
 _BUILD = build
 
 
+# =====
+ifneq ($(shell sh -c 'uname 2>/dev/null || echo Unknown'),FreeBSD)
+override _LDFLAGS += -latomic
+endif
+
 ifneq ($(MK_WITH_PTHREAD_NP),)
 override _CFLAGS += -DWITH_PTHREAD_NP
 endif

janus/src/acap.c

@@ -47,19 +47,6 @@ static void *_pcm_thread(void *v_acap);
 static void *_encoder_thread(void *v_acap);
 
 
-bool us_acap_probe(const char *name) {
-	snd_pcm_t *dev;
-	int err;
-	US_JLOG_INFO("acap", "Probing PCM capture ...");
-	if ((err = snd_pcm_open(&dev, name, SND_PCM_STREAM_CAPTURE, 0)) < 0) {
-		US_JLOG_PERROR_ALSA(err, "acap", "Can't probe PCM capture");
-		return false;
-	}
-	snd_pcm_close(dev);
-	US_JLOG_INFO("acap", "PCM capture is available");
-	return true;
-}
-
 us_acap_s *us_acap_init(const char *name, uint pcm_hz) {
 	us_acap_s *acap;
 	US_CALLOC(acap, 1);

janus/src/acap.h

@@ -53,8 +53,6 @@ typedef struct {
 } us_acap_s;
 
 
-bool us_acap_probe(const char *name);
-
 us_acap_s *us_acap_init(const char *name, uint pcm_hz);
 void us_acap_destroy(us_acap_s *acap);
 

janus/src/au.c

@@ -23,10 +23,78 @@
 #include "au.h"
 
 #include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <sys/stat.h>
 
 #include "uslibs/tools.h"
 
 
+bool us_au_probe(const char *name) {
+	// This function is very limited. It takes something like:
+	//   hw:0,0 or hw:tc358743,0 or plughw:UAC2Gadget,0
+	// parses card name (0, tc358743, UAC2Gadget) and checks
+	// the existence of it in /proc/asound/.
+	// It's enough for our case.
+
+	if (name == NULL) {
+		return false;
+	}
+
+	if (strchr(name, '/') || strchr(name, '.')) {
+		return false;
+	}
+
+	const char *begin = strchr(name, ':');
+	if (begin == NULL) {
+		return false;
+	}
+	begin += 1;
+	if (*begin == '\0') {
+		return false;
+	}
+
+	const char *end = strchr(begin, ',');
+	if (end == NULL) {
+		return false;
+	}
+	if (end - begin < 1) {
+		return false;
+	}
+
+	char *card = us_strdup(begin);
+	card[end - begin] = '\0';
+
+	bool numeric = true;
+	for (uz index = 0; card[index] != '\0'; ++index) {
+		if (!isdigit(card[index])) {
+			numeric = false;
+			break;
+		}
+	}
+
+	char *path;
+	if (numeric) {
+		US_ASPRINTF(path, "/proc/asound/card%s", card);
+	} else {
+		US_ASPRINTF(path, "/proc/asound/%s", card);
+	}
+
+	bool ok = false;
+	struct stat st;
+	if (lstat(path, &st) == 0) {
+		if (numeric && S_ISDIR(st.st_mode)) {
+			ok = true;
+		} else if (!numeric && S_ISLNK(st.st_mode)) {
+			ok = true;
+		}
+	}
+	free(path);
+	free(card);
+	return ok;
+}
+
 us_au_pcm_s *us_au_pcm_init(void) {
 	us_au_pcm_s *pcm;
 	US_CALLOC(pcm, 1);

janus/src/au.h

@@ -51,6 +51,7 @@ typedef struct {
 	u64		pts;
 } us_au_encoded_s;
 
+bool us_au_probe(const char *name);
 
 us_au_pcm_s *us_au_pcm_init(void);
 void us_au_pcm_destroy(us_au_pcm_s *pcm);

janus/src/client.c

@@ -193,16 +193,16 @@ static void *_video_or_acap_thread(void *v_client, bool video) {
 			};
 			janus_plugin_rtp_extensions_reset(&packet.extensions);
 
-			/*if (rtp->zero_playout_delay) {
+			if (rtp.zero_playout_delay) {
 				// https://github.com/pikvm/pikvm/issues/784
 				packet.extensions.min_delay = 0;
 				packet.extensions.max_delay = 0;
 			} else {
+				// Эти дефолты используются в Chrome/Safari/Firefox.
+				// Работает всё одинаково, потому что у них общая кодовая база WebRTC.
 				packet.extensions.min_delay = 0;
-				// 10s - Chromium/WebRTC default
-				// 3s - Firefox default
-				packet.extensions.max_delay = 300; // == 3s, i.e. 10ms granularity
-			}*/
+				packet.extensions.max_delay = 1000; // == 10s, i.e. 10ms granularity
+			}
 
 			if (rtp.video) {
 				uint video_orient = atomic_load(&client->video_orient);

janus/src/config.c

@@ -24,11 +24,11 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 
 #include <janus/config.h>
 #include <janus/plugins/plugin.h>
 
+#include "uslibs/types.h"
 #include "uslibs/tools.h"
 
 #include "const.h"
@@ -36,6 +36,7 @@
 
 
 static char *_get_value(janus_config *jcfg, const char *section, const char *option);
+static uint _get_uint(janus_config *jcfg, const char *section, const char *option, uint def);
 // static bool _get_bool(janus_config *jcfg, const char *section, const char *option, bool def);
 
 
@@ -61,20 +62,13 @@ us_config_s *us_config_init(const char *config_dir_path) {
 		goto error;
 	}
 	if ((config->acap_dev_name = _get_value(jcfg, "acap", "device")) != NULL) {
-		if ((config->tc358743_dev_path = _get_value(jcfg, "acap", "tc358743")) == NULL) {
-			US_JLOG_INFO("config", "Missing config value: acap.tc358743");
+		config->acap_hz = _get_uint(jcfg, "acap", "sampling_rate", 0);
+		config->tc358743_dev_path = _get_value(jcfg, "acap", "tc358743");
+		if (config->acap_hz == 0 && config->tc358743_dev_path == NULL) {
+			US_JLOG_ERROR("config", "Either acap.sampling_rate or acap.tc358743 required");
 			goto error;
 		}
-		if ((config->aplay_dev_name = _get_value(jcfg, "aplay", "device")) != NULL) {
-			char *path = _get_value(jcfg, "aplay", "check");
-			if (path != NULL) {
-				if (access(path, F_OK) != 0) {
-					US_JLOG_INFO("config", "No check file found, aplay will be disabled");
-					US_DELETE(config->aplay_dev_name, free);
-				}
-				US_DELETE(path, free);
-			}
-		}
+		config->aplay_dev_name = _get_value(jcfg, "aplay", "device");
 	}
 
 	goto ok;
@@ -105,6 +99,20 @@ static char *_get_value(janus_config *jcfg, const char *section, const char *opt
 	return us_strdup(option_obj->value);
 }
 
+static uint _get_uint(janus_config *jcfg, const char *section, const char *option, uint def) {
+	char *const tmp = _get_value(jcfg, section, option);
+	uint value = def;
+	if (tmp != NULL) {
+		errno = 0;
+		value = (uint)strtoul(tmp, NULL, 10);
+		if (errno != 0) {
+			value = def;
+		}
+		free(tmp);
+	}
+	return value;
+}
+
 /*static bool _get_bool(janus_config *jcfg, const char *section, const char *option, bool def) {
 	char *const tmp = _get_value(jcfg, section, option);
 	bool value = def;

janus/src/config.h

@@ -23,10 +23,14 @@
 #pragma once
 
 
+#include "uslibs/types.h"
+
+
 typedef struct {
 	char	*video_sink_name;
 
 	char	*acap_dev_name;
+	uint	acap_hz;
 	char	*tc358743_dev_path;
 
 	char	*aplay_dev_name;

janus/src/plugin.c

@@ -60,6 +60,8 @@
 #include "config.h"
 
 
+static const char *const	default_ice_url = "stun:stun.l.google.com:19302";
+
 static us_config_s		*_g_config = NULL;
 static const useconds_t	_g_watchers_polling = 100000;
 
@@ -67,7 +69,7 @@ static us_janus_client_s	*_g_clients = NULL;
 static janus_callbacks		*_g_gw = NULL;
 static us_ring_s			*_g_video_ring = NULL;
 static us_rtpv_s			*_g_rtpv = NULL;
-static us_rtpa_s			*_g_rtpa = NULL; // Also indicates "audio capture is available"
+static us_rtpa_s			*_g_rtpa = NULL;
 
 static pthread_t		_g_video_rtp_tid;
 static atomic_bool		_g_video_rtp_tid_created = false;
@@ -212,7 +214,15 @@ static void *_video_sink_thread(void *arg) {
 	return NULL;
 }
 
-static int _check_tc358743_acap(uint *hz) {
+static int _get_acap_hz(uint *hz) {
+	if (_g_config->acap_hz != 0) {
+		*hz = _g_config->acap_hz;
+		return 0;
+	}
+	if (_g_config->tc358743_dev_path == NULL) {
+		US_JLOG_ERROR("acap", "No configured sampling rate");
+		return -1;
+	}
 	int fd;
 	if ((fd = open(_g_config->tc358743_dev_path, O_RDWR)) < 0) {
 		US_JLOG_PERROR("acap", "Can't open TC358743 V4L2 device");
@@ -234,7 +244,6 @@ static void *_acap_thread(void *arg) {
 	atomic_store(&_g_acap_tid_created, true);
 
 	assert(_g_config->acap_dev_name != NULL);
-	assert(_g_config->tc358743_dev_path != NULL);
 	assert(_g_rtpa != NULL);
 
 	int once = 0;
@@ -248,7 +257,11 @@ static void *_acap_thread(void *arg) {
 		uint hz = 0;
 		us_acap_s *acap = NULL;
 
-		if (_check_tc358743_acap(&hz) < 0) {
+		if (!us_au_probe(_g_config->acap_dev_name)) {
+			US_ONCE({ US_JLOG_ERROR("acap", "No PCM capture device"); });
+			goto close_acap;
+		}
+		if (_get_acap_hz(&hz) < 0) {
 			goto close_acap;
 		}
 		if (hz == 0) {
@@ -263,7 +276,7 @@ static void *_acap_thread(void *arg) {
 		once = 0;
 
 		while (!_STOP && _HAS_WATCHERS && _HAS_LISTENERS) {
-			if (_check_tc358743_acap(&hz) < 0 || acap->pcm_hz != hz) {
+			if (_get_acap_hz(&hz) < 0 || acap->pcm_hz != hz) {
 				goto close_acap;
 			}
 			uz size = US_RTP_DATAGRAM_SIZE - US_RTP_HEADER_SIZE;
@@ -337,6 +350,11 @@ static void *_aplay_thread(void *arg) {
 			}
 
 			if (dev == NULL) {
+				if (!us_au_probe(_g_config->aplay_dev_name)) {
+					US_ONCE({ US_JLOG_ERROR("aplay", "No PCM playback device"); });
+					goto close_aplay;
+				}
+
 				int err = snd_pcm_open(&dev, _g_config->aplay_dev_name, SND_PCM_STREAM_PLAYBACK, 0);
 				if (err < 0) {
 					US_ONCE({ US_JLOG_PERROR_ALSA(err, "aplay", "Can't open PCM playback"); });
@@ -422,7 +440,7 @@ static int _plugin_init(janus_callbacks *gw, const char *config_dir_path) {
 
 	US_RING_INIT_WITH_ITEMS(_g_video_ring, 64, us_frame_init);
 	_g_rtpv = us_rtpv_init(_relay_rtp_clients);
-	if (_g_config->acap_dev_name != NULL && us_acap_probe(_g_config->acap_dev_name)) {
+	if (_g_config->acap_dev_name != NULL) {
 		_g_rtpa = us_rtpa_init(_relay_rtp_clients);
 		US_THREAD_CREATE(_g_acap_tid, _acap_thread, NULL);
 		if (_g_config->aplay_dev_name != NULL) {
@@ -600,13 +618,13 @@ static struct janus_plugin_result *_plugin_handle_message(
 				{
 					json_t *const obj = json_object_get(params, "audio");
 					if (obj != NULL && json_is_boolean(obj)) {
-						with_acap = (_g_rtpa != NULL && json_boolean_value(obj));
+						with_acap = (us_au_probe(_g_config->acap_dev_name) && json_boolean_value(obj));
 					}
 				}
 				{
 					json_t *const obj = json_object_get(params, "mic");
 					if (obj != NULL && json_is_boolean(obj)) {
-						with_aplay = (_g_config->aplay_dev_name != NULL && with_acap && json_boolean_value(obj));
+						with_aplay = (us_au_probe(_g_config->aplay_dev_name) && json_boolean_value(obj));
 					}
 				}
 				{
@@ -670,15 +688,13 @@ static struct janus_plugin_result *_plugin_handle_message(
 		}
 
 	} else if (!strcmp(request_str, "features")) {
-		const char *const stun_host = getenv("JANUS_USTREAMER_STUN_HOST");
-		const char *const stun_port = getenv("JANUS_USTREAMER_STUN_PORT");
+		const char *const ice_url = getenv("JANUS_USTREAMER_WEB_ICE_URL");
+		const bool acap_avail = us_au_probe(_g_config->acap_dev_name);
 		json_t *const features = json_pack(
-			"{s:b, s:b, s:{s:s, s:i}}",
-			"audio", (_g_rtpa != NULL),
-			"mic", (_g_rtpa != NULL && _g_config->aplay_dev_name != NULL),
-			"stun",
-			"host", (stun_host != NULL ? stun_host : ""),
-			"port", (stun_port != NULL ? atoi(stun_port) : 0)
+			"{s:b, s:b, s:{s:s?}}",
+			"audio", acap_avail,
+			"mic", (acap_avail && us_au_probe(_g_config->aplay_dev_name)),
+			"ice", "url", (ice_url != NULL ? ice_url : default_ice_url)
 		);
 		PUSH_STATUS("features", features, NULL);
 		json_decref(features);

janus/src/rtpa.c

@@ -54,6 +54,8 @@ char *us_rtpa_make_sdp(us_rtpa_s *rtpa, bool mic) {
 		"a=rtcp-fb:%u nack" RN
 		"a=rtcp-fb:%u nack pli" RN
 		"a=rtcp-fb:%u goog-remb" RN
+		"a=mid:a" RN
+		"a=msid:audio a" RN
 		"a=ssrc:%" PRIu32 " cname:ustreamer" RN
 		"a=%s" RN,
 		pl, pl,

janus/src/rtpv.c

@@ -69,6 +69,8 @@ char *us_rtpv_make_sdp(us_rtpv_s *rtpv) {
 		"a=rtcp-fb:%u nack" RN
 		"a=rtcp-fb:%u nack pli" RN
 		"a=rtcp-fb:%u goog-remb" RN
+		"a=mid:v" RN
+		"a=msid:video v" RN
 		"a=ssrc:%" PRIu32 " cname:ustreamer" RN
 		"a=extmap:1 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay" RN
 		"a=extmap:2 urn:3gpp:video-orientation" RN

linters/mypy.ini

@@ -1,5 +1,5 @@
 [mypy]
-python_version = 3.9
+python_version = 3.14
 ignore_missing_imports = true
 disallow_untyped_defs = true
 strict_optional = true

linters/tox.ini

@@ -3,7 +3,7 @@ envlist = cppcheck, flake8, pylint, mypy, vulture, htmlhint
 skipsdist = true
 
 [testenv]
-basepython = python3.13
+basepython = python3.14
 changedir = /src
 
 [testenv:cppcheck]

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 6.32" "January 2021"
+.TH USTREAMER-DUMP 1 "version 6.46" "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 6.32" "November 2020"
+.TH USTREAMER 1 "version 6.46" "November 2020"
 
 .SH NAME
 ustreamer \- stream MJPEG video from any V4L2 device to the network
@@ -52,7 +52,7 @@ Initial image resolution. Default: 640x480.
 .TP
 .BR \-m\ \fIfmt ", " \-\-format\ \fIfmt
 Image format.
-Available: YUYV, YVYU, UYVY, YUV420, YVU420, RGB565, RGB24, JPEG; default: YUYV.
+Available: YUYV, YVYU, UYVY, YUV420, YVU420, RGB565, RGB24, GREY, MJPEG, JPEG; default: YUYV.
 .TP
 .BR \-a\ \fIstd ", " \-\-tv\-standard\ \fIstd
 Force TV standard.
@@ -253,6 +253,9 @@ Interval between keyframes. Default: 30.
 .TP
 .BR \-\-h264\-m2m\-device\ \fI/dev/path
 Path to V4L2 mem-to-mem encoder device. Default: auto-select.
+.TP
+.BR \-\-h264\-boost\-device
+Increase encoder performance on PiKVM V4. Default: disabled.
 
 .SS "RAW sink options"
 .TP
@@ -276,6 +279,9 @@ Timeout for lock. Default: 1.
 .BR \-\-exit\-on\-parent\-death
 Exit the program if the parent process is dead. Required \fBWITH_PDEATHSIG\fR feature. Default: disabled.
 .TP
+.BR \-\-exit\-on\-device\-error
+Exit on any device error instead of polling until success. Default: disabled.
+.TP
 .BR \-\-exit\-on\-no\-clients \fIsec
 Exit the program if there have been no stream or sink clients or any HTTP requests in the last N seconds. Default: 0 (disabled).
 .TP

pkg/arch/PKGBUILD

@@ -3,7 +3,7 @@
 
 
 pkgname=ustreamer
-pkgver=6.32
+pkgver=6.46
 pkgrel=1
 pkgdesc="Lightweight and fast MJPEG-HTTP streamer"
 url="https://github.com/pikvm/ustreamer"
@@ -18,7 +18,7 @@ md5sums=(SKIP)
 _options="WITH_GPIO=1 WITH_SYSTEMD=1"
 if [ -e /usr/bin/python3 ]; then
 	_options="$_options WITH_PYTHON=1"
-	depends+=("python>=3.13" "python<3.14")
+	depends+=("python>=3.14" "python<3.15")
 	makedepends+=(python-setuptools python-pip python-build python-wheel)
 fi
 if [ -e /usr/include/janus/plugins/plugin.h ];then

pkg/openwrt/Makefile

@@ -6,7 +6,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ustreamer
-PKG_VERSION:=6.32
+PKG_VERSION:=6.46
 PKG_RELEASE:=1
 PKG_MAINTAINER:=Maxim Devaev <mdevaev@gmail.com>
 
@@ -25,7 +25,7 @@ define Package/ustreamer
   SECTION:=multimedia
   CATEGORY:=Multimedia
   TITLE:=uStreamer
-  DEPENDS:=+libpthread +libjpeg +libv4l +libbsd +libevent2 +libevent2-core +libevent2-extra +libevent2-pthreads
+  DEPENDS:=+libatomic +libpthread +libjpeg +libv4l +libbsd +libevent2 +libevent2-core +libevent2-extra +libevent2-pthreads
   URL:=https://github.com/pikvm/ustreamer
 endef
 

python/setup.py

@@ -34,7 +34,7 @@ def main() -> None:
     flags = _find_flags()
     setup(
         name="ustreamer",
-        version="6.32",
+        version="6.46",
         description="uStreamer tools",
         author="Maxim Devaev",
         author_email="mdevaev@gmail.com",

python/src/ustreamer.c

@@ -241,7 +241,8 @@ static PyObject *_MemsinkObject_wait_frame(_MemsinkObject *self, PyObject *args,
 	SET_NUMBER(online, Long, Bool);
 	SET_NUMBER(key, Long, Bool);
 	SET_NUMBER(gop, Long, Long);
-	SET_NUMBER(grab_ts, Double, Float);
+	SET_NUMBER(grab_begin_ts, Double, Float);
+	SET_NUMBER(grab_end_ts, Double, Float);
 	SET_NUMBER(encode_begin_ts, Double, Float);
 	SET_NUMBER(encode_end_ts, Double, Float);
 	SET_VALUE("data", PyBytes_FromStringAndSize((const char*)self->frame->data, self->frame->used));

src/Makefile

@@ -14,9 +14,9 @@ _V4P = ustreamer-v4p.bin
 
 _CFLAGS = -MD -c -std=c17 -Wall -Wextra -D_GNU_SOURCE $(CFLAGS)
 
-_USTR_LDFLAGS = $(LDFLAGS) -lm -ljpeg -pthread -lrt -latomic -levent -levent_pthreads
-_DUMP_LDFLAGS = $(LDFLAGS) -lm -ljpeg -pthread -lrt -latomic
-_V4P_LDFLAGS = $(LDFLAGS) -lm -ljpeg -pthread -lrt -latomic
+_USTR_LDFLAGS = $(LDFLAGS) -lm -ljpeg -pthread -lrt -levent -levent_pthreads
+_DUMP_LDFLAGS = $(LDFLAGS) -lm -ljpeg -pthread -lrt
+_V4P_LDFLAGS = $(LDFLAGS) -lm -ljpeg -pthread -lrt
 
 _USTR_SRCS = $(shell ls \
 	libs/*.c \
@@ -46,6 +46,12 @@ _OBJS = $(_USTR_SRCS:%.c=$(_BUILD)/%.o) $(_DUMP_SRCS:%.c=$(_BUILD)/%.o)
 
 
 # =====
+ifneq ($(shell sh -c 'uname 2>/dev/null || echo Unknown'),FreeBSD)
+override _USTR_LDFLAGS += -latomic
+override _DUMP_LDFLAGS += -latomic
+override _V4P_LDFLAGS += -latomic
+endif
+
 ifneq ($(MK_WITH_PYTHON),)
 override _CFLAGS += -DMK_WITH_PYTHON
 endif

src/dump/file.c

@@ -53,11 +53,13 @@ void us_output_file_write(void *v_output, const us_frame_s *frame) {
 		fprintf(output->fp,
 			"{\"size\": %zu, \"width\": %u, \"height\": %u,"
 			" \"format\": %u, \"stride\": %u, \"online\": %u, \"key\": %u, \"gop\": %u,"
-			" \"grab_ts\": %.3Lf, \"encode_begin_ts\": %.3Lf, \"encode_end_ts\": %.3Lf,"
+			" \"grab_begin_ts\": %.3Lf, \"grab_end_ts\": %.3Lf,"
+			" \"encode_begin_ts\": %.3Lf, \"encode_end_ts\": %.3Lf,"
 			" \"data\": \"%s\"}\n",
 			frame->used, frame->width, frame->height,
 			frame->format, frame->stride, frame->online, frame->key, frame->gop,
-			frame->grab_ts, frame->encode_begin_ts, frame->encode_end_ts,
+			frame->grab_begin_ts, frame->grab_end_ts,
+			frame->encode_begin_ts, frame->encode_end_ts,
 			output->base64_data);
 	} else {
 		fwrite(frame->data, 1, frame->used, output->fp);

src/dump/main.c

@@ -240,16 +240,22 @@ static int _dump_sink(
 			const long double now = us_get_now_monotonic();
 
 			char fourcc_str[8];
-			US_LOG_VERBOSE("Frame: %s - %ux%u -- online=%d, key=%d, kr=%d, gop=%u, latency=%.3Lf, backlog=%.3Lf, size=%zu",
+			US_LOG_VERBOSE("%s %.3Lf - %s %ux%u - gop=%u, key=%u, kr=%u - GRAB=%.3Lf ~~%.3Lf~~ ENC=%.3Lf ~~> LAT=%.3Lf - size=%zu",
+				(frame->online ? " ON" : "OFF"),
+				(last_ts ? now - last_ts : 0),
 				us_fourcc_to_string(frame->format, fourcc_str, 8),
-				frame->width, frame->height,
-				frame->online, frame->key, key_requested, frame->gop,
-				now - frame->grab_ts, (last_ts ? now - last_ts : 0),
+				frame->width,
+				frame->height,
+				frame->gop,
+				frame->key,
+				key_requested,
+				frame->grab_end_ts - frame->grab_begin_ts,
+				frame->encode_begin_ts - frame->grab_end_ts,
+				frame->encode_end_ts - frame->encode_begin_ts,
+				now - frame->grab_begin_ts,
 				frame->used);
-			last_ts = now;
 
-			US_LOG_DEBUG("       stride=%u, grab_ts=%.3Lf, encode_begin_ts=%.3Lf, encode_end_ts=%.3Lf",
-				frame->stride, frame->grab_ts, frame->encode_begin_ts, frame->encode_end_ts);
+			last_ts = now;
 
 			us_fpsi_update(fpsi, true, NULL);
 

src/libs/capture.c

@@ -48,6 +48,7 @@
 #include "threading.h"
 #include "frame.h"
 #include "xioctl.h"
+#include "tc358743.h"
 
 
 static const struct {
@@ -69,6 +70,7 @@ static const struct {
 	{"UYVY",	V4L2_PIX_FMT_UYVY},
 	{"YUV420",	V4L2_PIX_FMT_YUV420},
 	{"YVU420",	V4L2_PIX_FMT_YVU420},
+	{"GREY",	V4L2_PIX_FMT_GREY},
 	{"RGB565",	V4L2_PIX_FMT_RGB565},
 	{"RGB24",	V4L2_PIX_FMT_RGB24},
 	{"BGR24",	V4L2_PIX_FMT_BGR24},
@@ -192,12 +194,18 @@ int us_capture_open(us_capture_s *cap) {
 	_LOG_DEBUG("Capture device fd=%d opened", run->fd);
 
 	if (cap->dv_timings && cap->persistent) {
+		struct v4l2_control ctl = {.id = V4L2_CID_DV_RX_POWER_PRESENT};
+		if (!us_xioctl(run->fd, VIDIOC_G_CTRL, &ctl)) {
+			if (!ctl.value) {
+				goto error_no_cable;
+			}
+		}
 		_LOG_DEBUG("Probing DV-timings or QuerySTD ...");
-		if (_capture_open_dv_timings(cap, false) < 0) {
-			US_ONCE_FOR(run->open_error_once, __LINE__, {
-				_LOG_ERROR("No signal from source");
-			});
-			goto error_no_signal;
+		switch (_capture_open_dv_timings(cap, false)) {
+			case 0: break;
+			case US_ERROR_NO_SIGNAL: goto error_no_signal;
+			case US_ERROR_NO_SYNC: goto error_no_sync;
+			default: goto error;
 		}
 	}
 
@@ -215,6 +223,15 @@ int us_capture_open(us_capture_s *cap) {
 	if (_capture_open_format(cap, true) < 0) {
 		goto error;
 	}
+	if (cap->dv_timings && cap->persistent) {
+		struct v4l2_control ctl = {.id = TC358743_CID_LANES_ENOUGH};
+		if (!us_xioctl(run->fd, VIDIOC_G_CTRL, &ctl)) {
+			if (!ctl.value) {
+				_LOG_ERROR("Not enough lanes, hardware can't handle this signal");
+				goto error_no_lanes;
+			}
+		}
+	}
 	_capture_open_hw_fps(cap);
 	_capture_open_jpeg_quality(cap);
 	if (_capture_open_io_method(cap) < 0) {
@@ -247,9 +264,23 @@ error_no_device:
 	us_capture_close(cap);
 	return US_ERROR_NO_DEVICE;
 
-error_no_signal:
+error_no_cable:
 	us_capture_close(cap);
-	return US_ERROR_NO_DATA;
+	return US_ERROR_NO_CABLE;
+
+error_no_signal:
+	US_ONCE_FOR(run->open_error_once, __LINE__, { _LOG_ERROR("No signal from source"); });
+	us_capture_close(cap);
+	return US_ERROR_NO_SIGNAL;
+
+error_no_sync:
+	US_ONCE_FOR(run->open_error_once, __LINE__, { _LOG_ERROR("No sync on signal"); });
+	us_capture_close(cap);
+	return US_ERROR_NO_SYNC;
+
+error_no_lanes:
+	us_capture_close(cap);
+	return US_ERROR_NO_LANES;
 
 error:
 	run->open_error_once = 0;
@@ -416,10 +447,16 @@ int us_capture_hwbuf_grab(us_capture_s *cap, us_capture_hwbuf_s **hw) {
 	(*hw)->raw.stride = run->stride;
 	(*hw)->raw.online = true;
 	_v4l2_buffer_copy(&buf, &(*hw)->buf);
-	(*hw)->raw.grab_ts = (ldf)((buf.timestamp.tv_sec * (u64)1000) + (buf.timestamp.tv_usec / 1000)) / 1000;
+	(*hw)->raw.grab_begin_ts = (ldf)((buf.timestamp.tv_sec * (u64)1000) + (buf.timestamp.tv_usec / 1000)) / 1000;
+	(*hw)->raw.grab_end_ts = us_get_now_monotonic();
+
+	_LOG_DEBUG("Grabbed HW buffer=%u: bytesused=%u, grab_begin_ts=%.3Lf, grab_end_ts=%.3Lf, latency=%.3Lf, skipped=%u",
+		buf.index, buf.bytesused,
+		(*hw)->raw.grab_begin_ts,
+		(*hw)->raw.grab_end_ts,
+		(*hw)->raw.grab_end_ts - (*hw)->raw.grab_begin_ts,
+		skipped);
 
-	_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;
 }
 
@@ -538,19 +575,28 @@ bool _capture_is_buffer_valid(const us_capture_s *cap, const struct v4l2_buffer
 	if (us_is_jpeg(cap->run->format)) {
 		if (buf->bytesused < 125) {
 			// https://stackoverflow.com/questions/2253404/what-is-the-smallest-valid-jpeg-file-size-in-bytes
-			_LOG_DEBUG("Discarding invalid frame, too small to be a valid JPEG: bytesused=%u", buf->bytesused);
+			_LOG_DEBUG("Discarding invalid frame, too small to be a valid JPEG: bytesused=%u",
+				buf->bytesused);
 			return false;
 		}
 
-		const u8 *const end_ptr = data + buf->bytesused;
-		const u8 *const eoi_ptr = end_ptr - 2;
-		const u16 eoi_marker = (((u16)(eoi_ptr[0]) << 8) | eoi_ptr[1]);
-		if (eoi_marker != 0xFFD9 && eoi_marker != 0xD900 && eoi_marker != 0x0000) {
+		const u16 begin_marker = (((u16)(data[0]) << 8) | data[1]);
+		if (begin_marker != 0xFFD8) {
+			_LOG_DEBUG("Discarding JPEG frame with invalid header: begin_marker=0x%04x, bytesused=%u",
+				begin_marker, buf->bytesused);
+			return false;
+		}
+
+		const u8 *const end_ptr = data + buf->bytesused - 2;
+		const u16 end_marker = (((u16)(end_ptr[0]) << 8) | end_ptr[1]);
+		if (end_marker != 0xFFD9 && end_marker != 0xD900 && end_marker != 0x0000) {
 			if (!cap->allow_truncated_frames) {
-				_LOG_DEBUG("Discarding truncated JPEG frame: eoi_marker=0x%04x, bytesused=%u", eoi_marker, buf->bytesused);
+				_LOG_DEBUG("Discarding truncated JPEG frame: end_marker=0x%04x, bytesused=%u",
+					end_marker, buf->bytesused);
 				return false;
 			}
-			_LOG_DEBUG("Got truncated JPEG frame: eoi_marker=0x%04x, bytesused=%u", eoi_marker, buf->bytesused);
+			_LOG_DEBUG("Got truncated JPEG frame: end_marker=0x%04x, bytesused=%u",
+				end_marker, buf->bytesused);
 		}
 	}
 
@@ -619,6 +665,10 @@ static int _capture_open_dv_timings(us_capture_s *cap, bool apply) {
 		// 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)
+		switch (errno) {
+			case ENOLINK: return US_ERROR_NO_SIGNAL;
+			case ENOLCK: return US_ERROR_NO_SYNC;
+		}
 		dv_errno = errno;
 		goto querystd;
 	} else if (!apply) {
@@ -781,10 +831,8 @@ static int _capture_open_format(us_capture_s *cap, bool first) {
 	return 0;
 }
 
-static void _capture_open_hw_fps(us_capture_s *cap) {
-	us_capture_runtime_s *const run = cap->run;
-
-	run->hw_fps = 0;
+static void _capture_open_hw_fps(us_capture_s *cap) { // cppcheck-suppress constParameterPointer
+	const us_capture_runtime_s *const run = cap->run;
 
 	struct v4l2_streamparm setfps = {.type = run->capture_type};
 	_LOG_DEBUG("Querying HW FPS ...");
@@ -807,7 +855,7 @@ static void _capture_open_hw_fps(us_capture_s *cap) {
 	US_MEMSET_ZERO(setfps);
 	setfps.type = run->capture_type;
 	SETFPS_TPF(numerator) = 1;
-	SETFPS_TPF(denominator) = (cap->desired_fps == 0 ? 255 : cap->desired_fps);
+	SETFPS_TPF(denominator) = -1; // Request maximum possible FPS
 
 	if (us_xioctl(run->fd, VIDIOC_S_PARM, &setfps) < 0) {
 		_LOG_PERROR("Can't set HW FPS");
@@ -824,12 +872,7 @@ static void _capture_open_hw_fps(us_capture_s *cap) {
 		return;
 	}
 
-	run->hw_fps = SETFPS_TPF(denominator);
-	if (cap->desired_fps != run->hw_fps) {
-		_LOG_INFO("Using HW FPS: %u -> %u (coerced)", cap->desired_fps, run->hw_fps);
-	} else {
-		_LOG_INFO("Using HW FPS: %u", run->hw_fps);
-	}
+	_LOG_INFO("Using HW FPS: %u/%u", SETFPS_TPF(numerator), SETFPS_TPF(denominator));
 
 #	undef SETFPS_TPF
 }

src/libs/capture.h

@@ -39,7 +39,7 @@
 #define US_VIDEO_MAX_FPS		((uint)120)
 
 #define US_STANDARDS_STR		"PAL, NTSC, SECAM"
-#define US_FORMATS_STR			"YUYV, YVYU, UYVY, YUV420, YVU420, RGB565, RGB24, BGR24, MJPEG, JPEG"
+#define US_FORMATS_STR			"YUYV, YVYU, UYVY, YUV420, YVU420, RGB565, RGB24, BGR24, GREY, MJPEG, JPEG"
 #define US_IO_METHODS_STR		"MMAP, USERPTR"
 
 
@@ -58,7 +58,6 @@ typedef struct {
 	uint				format;
 	uint				stride;
 	float				hz;
-	uint				hw_fps;
 	uint				jpeg_quality;
 	uz					raw_size;
 	uint				n_bufs;
@@ -113,7 +112,6 @@ typedef struct {
 	uint				n_bufs;
 	bool				dma_export;
 	bool				dma_required;
-	uint				desired_fps;
 	uz					min_frame_size;
 	bool				allow_truncated_frames;
 	bool				persistent;

src/libs/const.h

@@ -26,7 +26,7 @@
 
 
 #define US_VERSION_MAJOR 6
-#define US_VERSION_MINOR 32
+#define US_VERSION_MINOR 46
 
 #define US_MAKE_VERSION2(_major, _minor) #_major "." #_minor
 #define US_MAKE_VERSION1(_major, _minor) US_MAKE_VERSION2(_major, _minor)

src/libs/drm/drm.c

@@ -28,7 +28,9 @@
 
 #include <sys/mman.h>
 #include <sys/stat.h>
-#include <sys/sysmacros.h>
+#ifdef __linux__
+#	include <sys/sysmacros.h>
+#endif
 
 #include <linux/videodev2.h>
 
@@ -376,7 +378,7 @@ int us_drm_expose_stub(us_drm_s *drm, us_drm_stub_e stub, const us_capture_s *ca
 			DRAW_MSG("=== PiKVM ===\n \n< UNSUPPORTED CAPTURE FORMAT >");
 			break;
 		case US_DRM_STUB_NO_SIGNAL:
-			DRAW_MSG("=== PiKVM ===\n \n< NO SIGNAL >");
+			DRAW_MSG("=== PiKVM ===\n \n< NO LIVE VIDEO >");
 			break;
 		case US_DRM_STUB_BUSY:
 			DRAW_MSG("=== PiKVM ===\n \n< ONLINE IS ACTIVE >");
@@ -664,6 +666,15 @@ static drmModeModeInfo *_find_best_mode(drmModeConnector *conn, uint width, uint
 			continue; // Discard interlaced
 		}
 		const float mode_hz = _get_refresh_rate(mode);
+		if (width == 640 && height == 416 && mode->hdisplay == 640 && mode->vdisplay == 480) {
+			// A special case for some ancient DOS device with VGA converter.
+			// @CapnKirk in Discord
+			if (hz > 0 && mode_hz < hz) {
+				best = mode;
+				best->vdisplay = 416;
+				break;
+			}
+		}
 		if (mode->hdisplay == width && mode->vdisplay == height) {
 			best = mode; // Any mode with exact resolution
 			if (hz > 0 && mode_hz == hz) {

src/libs/errors.h

@@ -24,4 +24,8 @@
 
 #define US_ERROR_COMMON		-1
 #define US_ERROR_NO_DEVICE	-2
-#define US_ERROR_NO_DATA	-3
+#define US_ERROR_NO_CABLE	-3
+#define US_ERROR_NO_SIGNAL	-4
+#define US_ERROR_NO_SYNC	-5
+#define US_ERROR_NO_LANES	-6
+#define US_ERROR_NO_DATA	-7

src/libs/fpsi.c

@@ -85,8 +85,6 @@ void us_fpsi_update(us_fpsi_s *fpsi, bool bump, const us_fpsi_meta_s *meta) {
 uint us_fpsi_get(us_fpsi_s *fpsi, us_fpsi_meta_s *meta) {
 	if (meta != NULL) {
 		assert(fpsi->with_meta);
-	} else {
-		assert(!fpsi->with_meta);
 	}
 
 	// Между чтением инфы и времени может быть гонка,
@@ -97,8 +95,7 @@ uint us_fpsi_get(us_fpsi_s *fpsi, us_fpsi_meta_s *meta) {
 	const ull state = atomic_load(&fpsi->state); // Потом инфа
 
 	uint current = state & 0xFFFF;
-	if (fpsi->with_meta) {
-		assert(meta != NULL);
+	if (fpsi->with_meta && meta != NULL) {
 		meta->width = (state >> 16) & 0xFFFF;
 		meta->height = (state >> 32) & 0xFFFF;
 		meta->online = (state >> 48) & 1;

src/libs/frame.c

@@ -36,7 +36,7 @@
 us_frame_s *us_frame_init(void) {
 	us_frame_s *frame;
 	US_CALLOC(frame, 1);
-	us_frame_realloc_data(frame, 512 * 1024);
+	us_frame_realloc_data(frame, 32 * 1024);
 	frame->dma_fd = -1;
 	return frame;
 }
@@ -84,6 +84,7 @@ uint us_frame_get_padding(const us_frame_s *frame) {
 	switch (frame->format) {
 		case V4L2_PIX_FMT_YUV420:
 		case V4L2_PIX_FMT_YVU420:
+		case V4L2_PIX_FMT_GREY:
 			bytes_per_pixel = 1;
 			break;
 

src/libs/frame.h

@@ -38,7 +38,8 @@
 	bool	key; \
 	uint	gop; \
 	\
-	ldf		grab_ts; \
+	ldf		grab_begin_ts; \
+	ldf		grab_end_ts; \
 	ldf		encode_begin_ts; \
 	ldf		encode_end_ts;
 
@@ -62,7 +63,8 @@ typedef struct {
 		(x_dest)->key = (x_src)->key; \
 		(x_dest)->gop = (x_src)->gop; \
 		\
-		(x_dest)->grab_ts = (x_src)->grab_ts; \
+		(x_dest)->grab_begin_ts = (x_src)->grab_begin_ts; \
+		(x_dest)->grab_end_ts = (x_src)->grab_end_ts; \
 		(x_dest)->encode_begin_ts = (x_src)->encode_begin_ts; \
 		(x_dest)->encode_end_ts = (x_src)->encode_end_ts; \
 	}

src/libs/frametext.c

@@ -121,9 +121,16 @@ void us_frametext_draw(us_frametext_s *ft, const char *text, uint width, uint he
 	if (block_width == 0 || block_height == 0) {
 		goto empty;
 	}
-	uint scale_x = frame->width / block_width / 2;
-	uint scale_y = frame->height / block_height / 3;
-	if (scale_x < scale_y / 1.5) {
+
+	// Ширина текста должна быть от 75%, до половины экрана, в зависимости от длины
+	const float div_x = US_MAX(US_MIN((100 / block_width * 2), 2.0), 1.5);
+
+	// Высоту тоже отрегулировать как-нибудь
+	const float div_y = US_MAX(US_MIN((70 / block_height * 2), 2.0), 1.5);
+
+	uint scale_x = frame->width / block_width / div_x;
+	uint scale_y = frame->height / block_height / div_y;
+	if (scale_x < scale_y / 1.5) { // Keep proportions
 		scale_y = scale_x * 1.5;
 	} else if (scale_y < scale_x * 1.5) {
 		scale_x = scale_y / 1.5;

src/libs/tc358743.c

@@ -33,17 +33,6 @@
 #include "xioctl.h"
 
 
-#ifndef V4L2_CID_USER_TC358743_BASE
-#	define V4L2_CID_USER_TC358743_BASE (V4L2_CID_USER_BASE + 0x1080)
-#endif
-#ifndef TC358743_CID_AUDIO_PRESENT
-#	define TC358743_CID_AUDIO_PRESENT (V4L2_CID_USER_TC358743_BASE + 1)
-#endif
-#ifndef TC358743_CID_AUDIO_SAMPLING_RATE
-#	define TC358743_CID_AUDIO_SAMPLING_RATE (V4L2_CID_USER_TC358743_BASE + 0)
-#endif
-
-
 int us_tc358743_xioctl_get_audio_hz(int fd, uint *audio_hz) {
 	*audio_hz = 0;
 

src/libs/tc358743.h

@@ -22,7 +22,26 @@
 
 #pragma once
 
+#include <linux/v4l2-controls.h>
+
 #include "types.h"
 
 
+#ifndef V4L2_CID_USER_TC358743_BASE
+#	define V4L2_CID_USER_TC358743_BASE (V4L2_CID_USER_BASE + 0x1080)
+#endif
+
+#ifndef TC358743_CID_AUDIO_SAMPLING_RATE
+#	define TC358743_CID_AUDIO_SAMPLING_RATE (V4L2_CID_USER_TC358743_BASE + 0)
+#endif
+
+#ifndef TC358743_CID_AUDIO_PRESENT
+#	define TC358743_CID_AUDIO_PRESENT (V4L2_CID_USER_TC358743_BASE + 1)
+#endif
+
+#ifndef TC358743_CID_LANES_ENOUGH
+#	define TC358743_CID_LANES_ENOUGH (V4L2_CID_USER_TC358743_BASE + 2)
+#endif
+
+
 int us_tc358743_xioctl_get_audio_hz(int fd, uint *audio_hz);

src/ustreamer/blank.c

@@ -36,7 +36,7 @@ us_blank_s *us_blank_init(void) {
 	blank->ft = us_frametext_init();
 	blank->raw = blank->ft->frame;
 	blank->jpeg = us_frame_init();
-	us_blank_draw(blank, "< NO SIGNAL >", 640, 480);
+	us_blank_draw(blank, "< NO LIVE VIDEO >", 640, 480);
 	return blank;
 }
 

src/ustreamer/encoder.c

@@ -131,7 +131,7 @@ void us_encoder_open(us_encoder_s *enc, us_capture_s *cap) {
 		} else {
 			US_LOG_INFO("Switching to CPU encoder: the input format is not (M)JPEG ...");
 			type = US_ENCODER_TYPE_CPU;
-			quality = cap->jpeg_quality;
+			quality = cap->jpeg_quality; // cppcheck-suppress redundantAssignment
 		}
 
 	} else if (type == US_ENCODER_TYPE_M2M_VIDEO || type == US_ENCODER_TYPE_M2M_IMAGE) {
@@ -162,14 +162,8 @@ void us_encoder_open(us_encoder_s *enc, us_capture_s *cap) {
 	run->quality = quality;
 	US_MUTEX_UNLOCK(run->mutex);
 
-	const ldf desired_interval = (
-		cap->desired_fps > 0 && (cap->desired_fps < cap->run->hw_fps || cap->run->hw_fps == 0)
-		? (ldf)1 / cap->desired_fps
-		: 0
-	);
-
 	enc->run->pool = us_workers_pool_init(
-		"JPEG", "jw", n_workers, desired_interval,
+		"JPEG", "jw", n_workers,
 		_worker_job_init, (void*)enc,
 		_worker_job_destroy,
 		_worker_run_job);

src/ustreamer/encoders/cpu/encoder.c

@@ -39,6 +39,7 @@ static void _jpeg_set_dest_frame(j_compress_ptr jpeg, us_frame_s *frame);
 
 static void _jpeg_write_scanlines_yuv(struct jpeg_compress_struct *jpeg, const us_frame_s *frame);
 static void _jpeg_write_scanlines_yuv_planar(struct jpeg_compress_struct *jpeg, const us_frame_s *frame);
+static void _jpeg_write_scanlines_grey(struct jpeg_compress_struct *jpeg, const us_frame_s *frame);
 static void _jpeg_write_scanlines_rgb565(struct jpeg_compress_struct *jpeg, const us_frame_s *frame);
 static void _jpeg_write_scanlines_rgb24(struct jpeg_compress_struct *jpeg, const us_frame_s *frame);
 #ifndef JCS_EXTENSIONS
@@ -75,6 +76,10 @@ void us_cpu_encoder_compress(const us_frame_s *src, us_frame_s *dest, uint quali
 		case V4L2_PIX_FMT_YVU420:
 			jpeg.in_color_space = JCS_YCbCr;
 			break;
+		case V4L2_PIX_FMT_GREY:
+			jpeg.input_components = 1;
+			jpeg.in_color_space = JCS_GRAYSCALE;
+			break;
 #		ifdef JCS_EXTENSIONS
 		case V4L2_PIX_FMT_BGR24:
 			jpeg.in_color_space = JCS_EXT_BGR;
@@ -102,6 +107,10 @@ void us_cpu_encoder_compress(const us_frame_s *src, us_frame_s *dest, uint quali
 		case V4L2_PIX_FMT_YVU420:
 			_jpeg_write_scanlines_yuv_planar(&jpeg, src);
 			break;
+		
+		case V4L2_PIX_FMT_GREY:
+			_jpeg_write_scanlines_grey(&jpeg, src);
+			break;
 
 		case V4L2_PIX_FMT_RGB565:
 			_jpeg_write_scanlines_rgb565(&jpeg, src);
@@ -249,6 +258,30 @@ static void _jpeg_write_scanlines_yuv_planar(struct jpeg_compress_struct *jpeg,
 	free(line_buf);
 }
 
+static void _jpeg_write_scanlines_grey(struct jpeg_compress_struct *jpeg, const us_frame_s *frame) {
+	u8 *line_buf;
+	US_CALLOC(line_buf, frame->width);
+
+	const uint padding = us_frame_get_padding(frame);
+	const u8 *data = frame->data;
+
+	while (jpeg->next_scanline < frame->height) {
+		u8 *ptr = line_buf;
+
+		for (uint x = 0; x < frame->width; ++x) {
+			ptr[0] = data[x];
+			ptr += 1;
+		}
+
+		data += frame->width + padding;
+
+		JSAMPROW scanlines[1] = {line_buf};
+		jpeg_write_scanlines(jpeg, scanlines, 1);
+	}
+
+	free(line_buf);
+}
+
 static void _jpeg_write_scanlines_rgb565(struct jpeg_compress_struct *jpeg, const us_frame_s *frame) {
 	u8 *line_buf;
 	US_CALLOC(line_buf, frame->width * 3);

src/ustreamer/http/server.c

@@ -198,16 +198,8 @@ int us_server_listen(us_server_s *server) {
 
 	us_frame_copy(stream->run->blank->jpeg, ex->frame);
 
-	{
-		struct timeval interval = {0};
-		if (stream->cap->desired_fps > 0) {
-			interval.tv_usec = 1000000 / (stream->cap->desired_fps * 2);
-		} else {
-			interval.tv_usec = 16000; // ~60fps
-		}
-		assert((run->refresher = event_new(run->base, -1, EV_PERSIST, _http_refresher, server)) != NULL);
-		assert(!event_add(run->refresher, &interval));
-	}
+	assert((run->refresher = event_new(run->base, -1, 0, _http_refresher, server)) != NULL);
+	stream->run->http->jpeg_refresher = run->refresher;
 
 	evhttp_set_timeout(run->http, server->timeout);
 
@@ -519,7 +511,7 @@ static void _http_callback_state(struct evhttp_request *request, void *v_server)
 		(server->fake_width ? server->fake_width : captured_meta.width),
 		(server->fake_height ? server->fake_height : captured_meta.height),
 		us_bool_to_string(captured_meta.online),
-		stream->cap->desired_fps,
+		stream->desired_fps,
 		captured_fps,
 		us_fpsi_get(ex->queued_fpsi, NULL),
 		run->stream_clients_count
@@ -730,7 +722,8 @@ static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_c
 				"X-UStreamer-Width: %u" RN
 				"X-UStreamer-Height: %u" RN
 				"X-UStreamer-Client-FPS: %u" RN
-				"X-UStreamer-Grab-Time: %.06Lf" RN
+				"X-UStreamer-Grab-Begin-Time: %.06Lf" RN
+				"X-UStreamer-Grab-End-Time: %.06Lf" RN
 				"X-UStreamer-Encode-Begin-Time: %.06Lf" RN
 				"X-UStreamer-Encode-End-Time: %.06Lf" RN
 				"X-UStreamer-Expose-Begin-Time: %.06Lf" RN
@@ -744,14 +737,15 @@ static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_c
 				ex->frame->width,
 				ex->frame->height,
 				us_fpsi_get(client->fpsi, NULL),
-				ex->frame->grab_ts,
+				ex->frame->grab_begin_ts,
+				ex->frame->grab_end_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
+				now_ts - ex->frame->grab_begin_ts
 			);
 		}
 	}
@@ -880,7 +874,7 @@ static void _http_send_snapshot(us_server_s *server) {
 			if (!captured_meta.online) {
 				if (blank == NULL) {
 					blank = us_blank_init();
-					us_blank_draw(blank, "< NO SIGNAL >", captured_meta.width, captured_meta.height);
+					us_blank_draw(blank, "< NO LIVE VIDEO >", captured_meta.width, captured_meta.height);
 				}
 				frame = blank->jpeg;
 			}
@@ -900,7 +894,8 @@ static void _http_send_snapshot(us_server_s *server) {
 			_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-Grab-Begin-Timestamp",		frame->grab_begin_ts);
+			ADD_TIME_HEADER("X-UStreamer-Grab-End-Timestamp",		frame->grab_end_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());
@@ -932,13 +927,15 @@ static void _http_refresher(int fd, short what, void *v_server) {
 	bool stream_updated = false;
 	bool frame_updated = false;
 
-	const int ri = us_ring_consumer_acquire(ring, 0);
-	if (ri >= 0) {
+	int ri;
+	while ((ri = us_ring_consumer_acquire(ring, 0)) >= 0) {
 		const us_frame_s *const frame = ring->items[ri];
 		frame_updated = _expose_frame(server, frame);
 		stream_updated = true;
 		us_ring_consumer_release(ring, ri);
-	} else if (ex->expose_end_ts + 1 < us_get_now_monotonic()) {
+	}
+
+	if (!stream_updated && (ex->expose_end_ts + 1 < us_get_now_monotonic())) {
 		_LOG_DEBUG("Repeating exposed ...");
 		ex->expose_begin_ts = us_get_now_monotonic();
 		ex->expose_cmp_ts = ex->expose_begin_ts;

src/ustreamer/m2m.c

@@ -43,7 +43,7 @@
 
 static us_m2m_encoder_s *_m2m_encoder_init(
 	const char *name, const char *path, uint output_format,
-	uint bitrate, uint gop, uint quality, bool allow_dma);
+	uint bitrate, uint gop, uint quality, bool allow_dma, bool boost);
 
 static void _m2m_encoder_ensure(us_m2m_encoder_s *enc, const us_frame_s *frame);
 
@@ -63,9 +63,9 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 #define _LOG_DEBUG(x_msg, ...)	US_LOG_DEBUG("%s: " x_msg, enc->name, ##__VA_ARGS__)
 
 
-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_h264_encoder_init(const char *name, const char *path, uint bitrate, uint gop, bool boost) {
 	bitrate *= 1000; // From Kbps
-	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_H264, bitrate, gop, 0, true);
+	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_H264, bitrate, gop, 0, true, boost);
 }
 
 us_m2m_encoder_s *us_m2m_mjpeg_encoder_init(const char *name, const char *path, uint quality) {
@@ -76,12 +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);
-	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_MJPEG, bitrate, 0, 0, true);
+	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_MJPEG, bitrate, 0, 0, true, false);
 }
 
 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, 0, 0, quality, false);
+	return _m2m_encoder_init(name, path, V4L2_PIX_FMT_JPEG, 0, 0, quality, false, false);
 }
 
 void us_m2m_encoder_destroy(us_m2m_encoder_s *enc) {
@@ -139,7 +139,7 @@ int us_m2m_encoder_compress(us_m2m_encoder_s *enc, const us_frame_s *src, us_fra
 
 static us_m2m_encoder_s *_m2m_encoder_init(
 	const char *name, const char *path, uint output_format,
-	uint bitrate, uint gop, uint quality, bool allow_dma) {
+	uint bitrate, uint gop, uint quality, bool allow_dma, bool boost) {
 
 	US_LOG_INFO("%s: Initializing encoder ...", name);
 
@@ -161,6 +161,7 @@ static us_m2m_encoder_s *_m2m_encoder_init(
 	enc->gop = gop;
 	enc->quality = quality;
 	enc->allow_dma = allow_dma;
+	enc->boost = boost;
 	enc->run = run;
 	return enc;
 }
@@ -222,7 +223,11 @@ static void _m2m_encoder_ensure(us_m2m_encoder_s *enc, const us_frame_s *frame)
 		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->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);
+			if (enc->boost) {
+				SET_OPTION(V4L2_CID_MPEG_VIDEO_H264_LEVEL, V4L2_MPEG_VIDEO_H264_LEVEL_4_2);
+			} else {
+				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);
 		}
@@ -276,10 +281,13 @@ static void _m2m_encoder_ensure(us_m2m_encoder_s *enc, const us_frame_s *frame)
 		}
 	}
 
-	if (run->p_width * run->p_height <= 1280 * 720) {
+	if (
+		(run->p_width * run->p_height <= 1280 * 720)
+		|| ((enc->output_format == V4L2_PIX_FMT_H264) && enc->boost)
+	) {
 		// 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.
+		// Если же превысить fps, то резко увеличивается время кодирования.
 		run->fps_limit = 60;
 	} else {
 		run->fps_limit = 30;

src/ustreamer/m2m.h

@@ -58,12 +58,13 @@ typedef struct {
 	uint	gop;
 	uint	quality;
 	bool	allow_dma;
+	bool	boost;
 
 	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, uint bitrate, uint gop);
+us_m2m_encoder_s *us_m2m_h264_encoder_init(const char *name, const char *path, uint bitrate, uint gop, bool boost);
 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);

src/ustreamer/options.c

@@ -100,6 +100,7 @@ enum _US_OPT_VALUES {
 	_O_H264_BITRATE,
 	_O_H264_GOP,
 	_O_H264_M2M_DEVICE,
+	_O_H264_BOOST,
 #	undef ADD_SINK
 
 #	ifdef WITH_V4P
@@ -117,6 +118,7 @@ enum _US_OPT_VALUES {
 #	ifdef WITH_PDEATHSIG
 	_O_EXIT_ON_PARENT_DEATH,
 #	endif
+	_O_EXIT_ON_DEVICE_ERROR,
 	_O_EXIT_ON_NO_CLIENTS,
 #	ifdef WITH_SETPROCTITLE
 	_O_PROCESS_NAME_PREFIX,
@@ -138,7 +140,7 @@ static const struct option _LONG_OPTS[] = {
 	{"input",					required_argument,	NULL,	_O_INPUT},
 	{"resolution",				required_argument,	NULL,	_O_RESOLUTION},
 	{"format",					required_argument,	NULL,	_O_FORMAT},
-	{"format-swap-rgb",			required_argument,	NULL,	_O_FORMAT_SWAP_RGB},
+	{"format-swap-rgb",			no_argument,		NULL,	_O_FORMAT_SWAP_RGB},
 	{"tv-standard",				required_argument,	NULL,	_O_TV_STANDARD},
 	{"io-method",				required_argument,	NULL,	_O_IO_METHOD},
 	{"desired-fps",				required_argument,	NULL,	_O_DESIRED_FPS},
@@ -205,6 +207,7 @@ static const struct option _LONG_OPTS[] = {
 	{"h264-bitrate",			required_argument,	NULL,	_O_H264_BITRATE},
 	{"h264-gop",				required_argument,	NULL,	_O_H264_GOP},
 	{"h264-m2m-device",			required_argument,	NULL,	_O_H264_M2M_DEVICE},
+	{"h264-boost",				no_argument,		NULL,	_O_H264_BOOST},
 	// Compatibility
 	{"sink",					required_argument,	NULL,	_O_JPEG_SINK},
 	{"sink-mode",				required_argument,	NULL,	_O_JPEG_SINK_MODE},
@@ -227,6 +230,7 @@ static const struct option _LONG_OPTS[] = {
 #	ifdef WITH_PDEATHSIG
 	{"exit-on-parent-death",	no_argument,		NULL,	_O_EXIT_ON_PARENT_DEATH},
 #	endif
+	{"exit-on-device-error",	no_argument,		NULL,	_O_EXIT_ON_DEVICE_ERROR},
 	{"exit-on-no-clients",		required_argument,	NULL,	_O_EXIT_ON_NO_CLIENTS},
 #	ifdef WITH_SETPROCTITLE
 	{"process-name-prefix",		required_argument,	NULL,	_O_PROCESS_NAME_PREFIX},
@@ -384,7 +388,7 @@ int options_parse(us_options_s *options, us_capture_s *cap, us_encoder_s *enc, u
 			case _O_FORMAT_SWAP_RGB:	OPT_SET(cap->format_swap_rgb, true);
 			case _O_TV_STANDARD:		OPT_PARSE_ENUM("TV standard", cap->standard, us_capture_parse_standard, US_STANDARDS_STR);
 			case _O_IO_METHOD:			OPT_PARSE_ENUM("IO method", cap->io_method, us_capture_parse_io_method, US_IO_METHODS_STR);
-			case _O_DESIRED_FPS:		OPT_NUMBER("--desired-fps", cap->desired_fps, 0, US_VIDEO_MAX_FPS, 0);
+			case _O_DESIRED_FPS:		OPT_NUMBER("--desired-fps", stream->desired_fps, 0, US_VIDEO_MAX_FPS, 0);
 			case _O_MIN_FRAME_SIZE:		OPT_NUMBER("--min-frame-size", cap->min_frame_size, 1, 8192, 0);
 			case _O_ALLOW_TRUNCATED_FRAMES:	OPT_SET(cap->allow_truncated_frames, true);
 			case _O_PERSISTENT:			OPT_SET(cap->persistent, true);
@@ -467,6 +471,7 @@ int options_parse(us_options_s *options, us_capture_s *cap, us_encoder_s *enc, u
 			case _O_H264_BITRATE:			OPT_NUMBER("--h264-bitrate", stream->h264_bitrate, 25, 20000, 0);
 			case _O_H264_GOP:				OPT_NUMBER("--h264-gop", stream->h264_gop, 0, 60, 0);
 			case _O_H264_M2M_DEVICE:		OPT_SET(stream->h264_m2m_path, optarg);
+			case _O_H264_BOOST:				OPT_SET(stream->h264_boost, true);
 
 #			ifdef WITH_V4P
 			case _O_V4P:
@@ -490,6 +495,7 @@ int options_parse(us_options_s *options, us_capture_s *cap, us_encoder_s *enc, u
 				};
 				break;
 #			endif
+			case _O_EXIT_ON_DEVICE_ERROR:	OPT_SET(stream->exit_on_device_error, true);
 			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);
@@ -743,6 +749,7 @@ static void _help(FILE *fp, const us_capture_s *cap, const us_encoder_s *enc, co
 	SAY("    --h264-bitrate <kbps>  ───────── H264 bitrate in Kbps. Default: %u.\n", stream->h264_bitrate);
 	SAY("    --h264-gop <N>  ──────────────── Interval between keyframes. Default: %u.\n", stream->h264_gop);
 	SAY("    --h264-m2m-device </dev/path>  ─ Path to V4L2 M2M encoder device. Default: auto select.\n");
+	SAY("    --h264-boost  ────────────────── Increase encoder performance on PiKVM V4. Default: disabled.\n");
 #	ifdef WITH_V4P
 	SAY("Passthrough options for PiKVM V4:");
 	SAY("═════════════════════════════════");

src/ustreamer/stream.c

@@ -28,9 +28,12 @@
 #include <unistd.h>
 #include <errno.h>
 #include <assert.h>
+#include <math.h>
 
 #include <pthread.h>
 
+#include <event2/event.h> // jpeg_refresher
+
 #include "../libs/types.h"
 #include "../libs/errors.h"
 #include "../libs/tools.h"
@@ -129,7 +132,7 @@ us_stream_s *us_stream_init(us_capture_s *cap, us_encoder_s *enc) {
 
 void us_stream_update_blank(us_stream_s *stream, const us_capture_s *cap) {
 	us_stream_runtime_s *const run = stream->run;
-	us_blank_draw(run->blank, "< NO SIGNAL >", cap->width, cap->height);
+	us_blank_draw(run->blank, "< NO LIVE VIDEO >", cap->width, cap->height);
 	us_fpsi_frame_to_meta(run->blank->raw, &run->notify_meta); // Initial "unchanged" meta
 	_stream_update_captured_fpsi(stream, run->blank->raw, false);
 }
@@ -154,7 +157,13 @@ void us_stream_loop(us_stream_s *stream) {
 	atomic_store(&run->http->last_request_ts, us_get_now_monotonic());
 
 	if (stream->h264_sink != NULL) {
-		run->h264_enc = us_m2m_h264_encoder_init("H264", stream->h264_m2m_path, stream->h264_bitrate, stream->h264_gop);
+		run->h264_enc = us_m2m_h264_encoder_init(
+			"H264",
+			stream->h264_m2m_path,
+			stream->h264_bitrate,
+			stream->h264_gop,
+			stream->h264_boost);
+
 		run->h264_tmp_src = us_frame_init();
 		run->h264_dest = us_frame_init();
 	}
@@ -312,6 +321,9 @@ static void *_jpeg_thread(void *v_ctx) {
 	_worker_context_s *ctx = v_ctx;
 	us_stream_s *stream = ctx->stream;
 
+	uint take = 1;
+	uint step = 1;
+
 	ldf grab_after_ts = 0;
 	uint fluency_passed = 0;
 
@@ -330,7 +342,7 @@ static void *_jpeg_thread(void *v_ctx) {
 					atomic_fetch_sub(&stream->run->http->snapshot_requested, 1);
 				}
 				US_LOG_PERF("JPEG: ##### Encoded JPEG exposed; worker=%s, latency=%.3Lf",
-					wr->name, us_get_now_monotonic() - job->dest->grab_ts);
+					wr->name, us_get_now_monotonic() - job->dest->grab_begin_ts);
 			} else {
 				US_LOG_PERF("JPEG: ----- Encoded JPEG dropped; worker=%s", wr->name);
 			}
@@ -348,6 +360,19 @@ static void *_jpeg_thread(void *v_ctx) {
 			continue;
 		}
 
+		if (stream->desired_fps > 0) {
+			const uint captured_fps = us_fpsi_get(stream->run->http->captured_fpsi, NULL);
+			take = ceilf((float)captured_fps / (float)stream->desired_fps);
+			if (step < take) {
+				US_LOG_DEBUG("JPEG: Passed encoding for FPS limit: step=%u, take=%u", step, take);
+				++step;
+				us_capture_hwbuf_decref(hw);
+				continue;
+			} else {
+				step = 1;
+			}
+		}
+
 		const ldf now_ts = us_get_now_monotonic();
 		if (now_ts < grab_after_ts) {
 			fluency_passed += 1;
@@ -394,7 +419,9 @@ static void *_h264_thread(void *v_ctx) {
 	_worker_context_s *ctx = v_ctx;
 	us_stream_s *stream = ctx->stream;
 
-	ldf grab_after_ts = 0;
+	uint take = 1;
+	uint step = 1;
+
 	while (!atomic_load(ctx->stop)) {
 		us_capture_hwbuf_s *hw = _get_latest_hw(ctx->queue);
 		if (hw == NULL) {
@@ -405,23 +432,25 @@ static void *_h264_thread(void *v_ctx) {
 			US_LOG_VERBOSE("H264: Passed encoding because nobody is watching");
 			goto decref;
 		}
-		if (hw->raw.grab_ts < grab_after_ts) {
-			US_LOG_DEBUG("H264: Passed encoding for FPS limit");
-			goto decref;
+
+		uint fps_limit = stream->run->h264_enc->run->fps_limit;
+		if (stream->desired_fps > 0 && (fps_limit == 0 || stream->desired_fps < fps_limit)) {
+			fps_limit = stream->desired_fps;
+		}
+		if (fps_limit > 0) {
+			const uint captured_fps = us_fpsi_get(stream->run->http->captured_fpsi, NULL);
+			take = ceilf((float)captured_fps / (float)fps_limit);
+			if (step < take) {
+				US_LOG_DEBUG("H264: Passed encoding for FPS limit: step=%u, take=%u", step, take);
+				++step;
+				goto decref;
+			} else {
+				step = 1;
+			}
 		}
 
 		_stream_encode_expose_h264(ctx->stream, &hw->raw, false);
 
-		// 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 uint fps_limit = stream->run->h264_enc->run->fps_limit;
-		if (fps_limit > 0) {
-			const ldf frame_interval = (ldf)1 / fps_limit;
-			grab_after_ts = hw->raw.grab_ts + frame_interval - 0.01;
-		}
-
 	decref:
 		us_capture_hwbuf_decref(hw);
 	}
@@ -529,6 +558,8 @@ static int _stream_init_loop(us_stream_s *stream) {
 
 	int once = 0;
 	while (!atomic_load(&stream->run->stop)) {
+		const char *blank_reason = "< NO LIVE VIDEO >";
+
 #		ifdef WITH_GPIO
 		us_gpio_set_stream_online(false);
 #		endif
@@ -554,17 +585,68 @@ static int _stream_init_loop(us_stream_s *stream) {
 		switch (us_capture_open(stream->cap)) {
 			case 0: break;
 			case US_ERROR_NO_DEVICE:
-			case US_ERROR_NO_DATA:
-				US_ONCE({ US_LOG_INFO("Waiting for the capture device ..."); });
-				goto offline_and_retry;
+				blank_reason = (
+					"< NO CAPTURE DEVICE >\n \n"
+					"  Possible reasons:  \n \n"
+					"  - Device unplugged \n \n"
+					"  - Bad config       \n \n"
+					"  - Malfunction      "
+				);
+				goto silent_error;
+			case US_ERROR_NO_CABLE:
+				blank_reason = (
+					"< NO VIDEO SOURCE >\n \n"
+					" Possible reasons: \n \n"
+					" - Source is off   \n \n"
+					" - Cable problems  "
+				);
+				goto silent_error;
+			case US_ERROR_NO_SIGNAL:
+				blank_reason = (
+					"< NO SIGNAL DETECTED >\n \n"
+					"   Possible reasons:  \n \n"
+                    "   - Video suspended  \n \n"
+					"   - Cable problems   "
+				);
+				goto silent_error;
+			case US_ERROR_NO_SYNC:
+				blank_reason = (
+					"< NO SYNC WITH SIGNAL >\n \n"
+					"   Possible reasons:   \n \n"
+					"   - Source is crazy   \n \n"
+					"   - Cable problems    "
+				);
+				goto silent_error;
+			case US_ERROR_NO_LANES:
+				blank_reason = (
+					"< UNSUPPORTED SIGNAL TIMINGS >\n \n"
+					"      Possible reasons:       \n \n"
+					"    - Too high frequency      \n \n"
+					"    - Source ignores EDID     \n \n"
+					"    - Invalid EDID            "
+				);
+				goto verbose_error;
 			default:
-				once = 0;
-				goto offline_and_retry;
+				goto verbose_error;
 		}
 		us_encoder_open(stream->enc, stream->cap);
 		return 0;
 
+	silent_error:
+		if (!stream->exit_on_device_error) {
+			US_ONCE({ US_LOG_INFO("Waiting for the capture device ..."); });
+		}
+		goto offline_and_retry;
+
+	verbose_error:
+		once = 0;
+		goto offline_and_retry;
+
 	offline_and_retry:
+		if (stream->exit_on_device_error) {
+			US_LOG_INFO("Device error, exiting ...");
+			us_process_suicide();
+		}
 		for (uint count = 0; count < stream->error_delay * 10; ++count) {
 			if (atomic_load(&run->stop)) {
 				break;
@@ -577,7 +659,7 @@ static int _stream_init_loop(us_stream_s *stream) {
 					width = stream->cap->width;
 					height = stream->cap->height;
 				}
-				us_blank_draw(run->blank, "< NO SIGNAL >", width, height);
+				us_blank_draw(run->blank, blank_reason, width, height);
 
 				_stream_update_captured_fpsi(stream, run->blank->raw, false);
 				_stream_expose_jpeg(stream, run->blank->jpeg);
@@ -643,6 +725,7 @@ static void _stream_expose_jpeg(us_stream_s *stream, const us_frame_s *frame) {
 	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);
+	event_active(run->http->jpeg_refresher, 0, 0);
 	if (stream->jpeg_sink != NULL) {
 		us_memsink_server_put(stream->jpeg_sink, dest, NULL);
 	}

src/ustreamer/stream.h

@@ -26,6 +26,8 @@
 
 #include <pthread.h>
 
+#include <event2/event.h> // jpeg_refresher
+
 #include "../libs/types.h"
 #include "../libs/queue.h"
 #include "../libs/ring.h"
@@ -51,6 +53,7 @@ typedef struct {
 	atomic_bool		h264_online;
 	us_fpsi_s		*h264_fpsi;
 
+	struct event	*jpeg_refresher;
 	us_ring_s		*jpeg_ring;
 	atomic_bool		has_clients;
 	atomic_uint		snapshot_requested;
@@ -77,9 +80,11 @@ typedef struct {
 	us_capture_s	*cap;
 	us_encoder_s	*enc;
 
+	uint			desired_fps;
 	bool			notify_parent;
 	bool			slowdown;
 	uint			error_delay;
+	bool			exit_on_device_error;
 	uint			exit_on_no_clients;
 
 	us_memsink_s	*jpeg_sink;
@@ -89,6 +94,7 @@ typedef struct {
 	uint			h264_bitrate;
 	uint			h264_gop;
 	char			*h264_m2m_path;
+	bool			h264_boost;
 
 #	ifdef WITH_V4P
 	us_drm_s		*drm;

src/ustreamer/workers.c

@@ -37,7 +37,7 @@ static void *_worker_thread(void *v_worker);
 
 
 us_workers_pool_s *us_workers_pool_init(
-	const char *name, const char *wr_prefix, uint n_workers, ldf desired_interval,
+	const char *name, const char *wr_prefix, uint n_workers,
 	us_workers_pool_job_init_f job_init, void *job_init_arg,
 	us_workers_pool_job_destroy_f job_destroy,
 	us_workers_pool_run_job_f run_job) {
@@ -47,7 +47,6 @@ us_workers_pool_s *us_workers_pool_init(
 	us_workers_pool_s *pool;
 	US_CALLOC(pool, 1);
 	pool->name = name;
-	pool->desired_interval = desired_interval;
 	pool->job_destroy = job_destroy;
 	pool->run_job = run_job;
 
@@ -147,14 +146,8 @@ ldf us_workers_pool_get_fluency_delay(us_workers_pool_s *pool, const us_worker_s
 
 	pool->approx_job_time = approx_job_time;
 
-	const ldf min_delay = pool->approx_job_time / pool->n_workers; // Среднее время работы размазывается на N воркеров
-
-	if (pool->desired_interval > 0 && min_delay > 0 && pool->desired_interval > min_delay) {
-		// Искусственное время задержки на основе желаемого FPS, если включен --desired-fps
-		// и аппаратный fps не попадает точно в желаемое значение
-		return pool->desired_interval;
-	}
-	return min_delay;
+	// Среднее время работы размазывается на N воркеров
+	return (pool->approx_job_time / pool->n_workers);
 }
 
 static void *_worker_thread(void *v_worker) {

src/ustreamer/workers.h

@@ -56,7 +56,6 @@ typedef bool (*us_workers_pool_run_job_f)(us_worker_s *wr);
 
 typedef struct us_workers_pool_sx {
 	const char		*name;
-	ldf				desired_interval;
 
 	us_workers_pool_job_destroy_f	job_destroy;
 	us_workers_pool_run_job_f		run_job;
@@ -76,7 +75,7 @@ typedef struct us_workers_pool_sx {
 
 
 us_workers_pool_s *us_workers_pool_init(
-	const char *name, const char *wr_prefix, uint n_workers, ldf desired_interval,
+	const char *name, const char *wr_prefix, uint n_workers,
 	us_workers_pool_job_init_f job_init, void *job_init_arg,
 	us_workers_pool_job_destroy_f job_destroy,
 	us_workers_pool_run_job_f run_job);

src/v4p/main.c

@@ -242,7 +242,7 @@ static void _main_loop(void) {
 	us_drm_destroy(drm);
 }
 
-static void *_follower_thread(void *v_unix_follow) {
+static void *_follower_thread(void *v_unix_follow) { // cppcheck-suppress constParameterCallback
 	US_THREAD_SETTLE("follower");
 	const char *path = v_unix_follow;
 	assert(path != NULL);