Bump version: 1.12 → 1.13

.bumpversion.cfg

@@ -1,7 +1,7 @@
 [bumpversion]
 commit = True
 tag = True
-current_version = 1.10
+current_version = 1.13
 parse = (?P<major>\d+)\.(?P<minor>\d+)(\.(?P<patch>\d+)(\-(?P<release>[a-z]+))?)?
 serialize = 
 	{major}.{minor}

Makefile

@@ -87,7 +87,7 @@ $(PROG): $(_SRCS:%.c=$(BUILD)/%.o)
 $(BUILD)/%.o: %.c
 	$(info -- CC $<)
 	@ mkdir -p $(dir $@) || true
-	@ $(CC) $< -o $@ $(CFLAGS) $(_LIBS)
+	@ $(CC) $< -o $@ $(CFLAGS)
 
 
 release:

README.md

@@ -32,6 +32,10 @@ If you're going to live-stream from your backyard webcam and need to control it,
 # Building
 You'll need  ```make```, ```gcc```, ```libevent``` with ```pthreads``` support, ```libjpeg8```/```libjpeg-turbo```, ```libuuid``` and ```libbsd``` (only for Linux).
 
+* Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
+* Raspbian: `sudo apt install libevent-dev libevent-pthreads-2.1-6-dev libjpeg8-dev uuid-dev libbsd-dev`.
+* Debian: `sudo apt install build-essential libevent-dev libjpeg62-turbo-dev uuid-dev libbsd-dev`.
+
 On Raspberry Pi you can build the program with OpenMAX IL. To do this pass option ```WITH_OMX=1``` to ```make```. To enable GPIO support install [wiringPi](http://wiringpi.com) and pass option ```WITH_GPIO=1```. If the compiler reports about a missing function ```pthread_get_name_np()``` (or similar), add option ```WITH_PTHREAD_NP=0``` (it's enabled by default). For the similar error with ```setproctitle()``` add option ```WITH_SETPROCTITLE=0```.
 
 ```
@@ -64,6 +68,10 @@ $ ./ustreamer \
 
 You can always view the full list of options with ```ustreamer --help```.
 
+-----
+# Tips
+* [Running uStreamer via systemd service](https://github.com/pikvm/ustreamer/issues/16)
+
 -----
 # License
 Copyright (C) 2018 by Maxim Devaev mdevaev@gmail.com

README.ru.md

@@ -32,6 +32,10 @@
 # Сборка
 Для сборки вам понадобятся ```make```, ```gcc```, ```libevent``` с поддержкой ```pthreads```, ```libjpeg8```/```libjpeg-turbo```, ```libuuid``` и ```libbsd``` (только для Linux).
 
+* Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
+* Raspbian: `sudo apt install libevent-dev libevent-pthreads-2.1-6-dev libjpeg8-dev uuid-dev libbsd-dev`.
+* Debian: `sudo apt install build-essential libevent-dev libjpeg62-turbo-dev uuid-dev libbsd-dev`.
+
 На Raspberry Pi программу можно собрать с поддержкой OpenMAX IL. Для этого передайте ```make``` параметр ```WITH_OMX=1```. Для включения сборки с поддержкой GPIO установите [wiringPi](http://wiringpi.com) и добавьте параметр ```WITH_GPIO=1```. Если при сборке компилятор ругается на отсутствие функции ```pthread_get_name_np()``` или другой подобной, добавьте параметр ```WITH_PTHREAD_NP=0``` (по умолчанию он включен). При аналогичной ошибке с функцией ```setproctitle()``` добавьте параметр ```WITH_SETPROCTITLE=0```.
 
 ```
@@ -64,6 +68,10 @@ $ ./ustreamer \
 
 За полным списком опций обращайтесь ко встроенной справке: ```ustreamer --help```.
 
+-----
+# Советы
+* [Запуск с помощью systemd-сервиса](https://github.com/pikvm/ustreamer/issues/16)
+
 -----
 # Лицензия
 Copyright (C) 2018 by Maxim Devaev mdevaev@gmail.com

pkg/arch/PKGBUILD

@@ -3,7 +3,7 @@
 
 
 pkgname=ustreamer
-pkgver=1.10
+pkgver=1.13
 pkgrel=1
 pkgdesc="Lightweight and fast MJPG-HTTP streamer"
 url="https://github.com/pikvm/ustreamer"

pkg/openwrt/Makefile

@@ -6,7 +6,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ustreamer
-PKG_VERSION:=1.10
+PKG_VERSION:=1.13
 PKG_RELEASE:=1
 PKG_MAINTAINER:=Maxim Devaev <mdevaev@gmail.com>
 

src/config.h

@@ -23,5 +23,5 @@
 #pragma once
 
 #ifndef VERSION
-#	define VERSION "1.10"
+#	define VERSION "1.13"
 #endif

src/device.c

@@ -77,9 +77,10 @@ static int _device_open_mmap(struct device_t *dev);
 static int _device_open_queue_buffers(struct device_t *dev);
 static void _device_open_alloc_picbufs(struct device_t *dev);
 static int _device_apply_resolution(struct device_t *dev, unsigned width, unsigned height);
+
 static void _device_apply_controls(struct device_t *dev);
-static int _device_check_control(struct device_t *dev, const char *name, unsigned cid, int value, bool quiet);
-static void _device_set_control(struct device_t *dev, const char *name, unsigned cid, int value, bool quiet);
+static int _device_query_control(struct device_t *dev, struct v4l2_queryctrl *query, const char *name, unsigned cid, bool quiet);
+static void _device_set_control(struct device_t *dev, struct v4l2_queryctrl *query, const char *name, unsigned cid, int value, bool quiet);
 
 static const char *_format_to_string_fourcc(char *buf, size_t size, unsigned format);
 static const char *_format_to_string_nullable(unsigned format);
@@ -390,7 +391,7 @@ static int _device_apply_dv_timings(struct device_t *dev) {
 	LOG_DEBUG("Calling ioctl(VIDIOC_QUERY_DV_TIMINGS) ...");
 	if (xioctl(dev->run->fd, VIDIOC_QUERY_DV_TIMINGS, &dv) == 0) {
 		LOG_INFO("Got new DV timings: resolution=%ux%u, pixclk=%llu",
-			dv.bt.width, dv.bt.height, dv.bt.pixelclock);
+			dv.bt.width, dv.bt.height, (unsigned long long)dv.bt.pixelclock); // Issue #11
 
 		LOG_DEBUG("Calling ioctl(VIDIOC_S_DV_TIMINGS) ...");
 		if (xioctl(dev->run->fd, VIDIOC_S_DV_TIMINGS, &dv) < 0) {
@@ -610,65 +611,81 @@ static int _device_apply_resolution(struct device_t *dev, unsigned width, unsign
 }
 
 static void _device_apply_controls(struct device_t *dev) {
-#	define SET_CID(_cid, _dest, _value, _quiet) { \
-			if (_device_check_control(dev, #_dest, _cid, _value, _quiet) == 0) { \
-				_device_set_control(dev, #_dest, _cid, _value, _quiet); \
+#	define SET_CID_VALUE(_cid, _field, _value, _quiet) { \
+			struct v4l2_queryctrl query; \
+			if (_device_query_control(dev, &query, #_field, _cid, _quiet) == 0) { \
+				_device_set_control(dev, &query, #_field, _cid, _value, _quiet); \
 			} \
 		}
 
-#	define SET_CID_MANUAL(_cid, _dest) { \
-			if (dev->ctl._dest.value_set) { \
-				SET_CID(_cid, _dest, dev->ctl._dest.value, false); \
+#	define SET_CID_DEFAULT(_cid, _field, _quiet) { \
+			struct v4l2_queryctrl query; \
+			if (_device_query_control(dev, &query, #_field, _cid, _quiet) == 0) { \
+				_device_set_control(dev, &query, #_field, _cid, query.default_value, _quiet); \
 			} \
 		}
 
-#	define SET_CID_AUTO(_cid_auto, _cid_manual, _dest) { \
-			if (dev->ctl._dest.value_set || dev->ctl._dest.auto_set) { \
-				SET_CID(_cid_auto, _dest##_auto, dev->ctl._dest.auto_set, dev->ctl._dest.value_set); \
-				SET_CID_MANUAL(_cid_manual, _dest); \
+#	define CONTROL_MANUAL_CID(_cid, _field) { \
+			if (dev->ctl._field.mode == CTL_MODE_VALUE) { \
+				SET_CID_VALUE(_cid, _field, dev->ctl._field.value, false); \
+			} else if (dev->ctl._field.mode == CTL_MODE_DEFAULT) { \
+				SET_CID_DEFAULT(_cid, _field, false); \
 			} \
 		}
 
-	SET_CID_AUTO	(V4L2_CID_AUTOBRIGHTNESS,		V4L2_CID_BRIGHTNESS,				brightness);
-	SET_CID_MANUAL	(								V4L2_CID_CONTRAST,					contrast);
-	SET_CID_MANUAL	(								V4L2_CID_SATURATION,				saturation);
-	SET_CID_AUTO	(V4L2_CID_HUE_AUTO,				V4L2_CID_HUE,						hue);
-	SET_CID_MANUAL	(								V4L2_CID_GAMMA,						gamma);
-	SET_CID_MANUAL	(								V4L2_CID_SHARPNESS,					sharpness);
-	SET_CID_MANUAL	(								V4L2_CID_BACKLIGHT_COMPENSATION,	backlight_compensation);
-	SET_CID_AUTO	(V4L2_CID_AUTO_WHITE_BALANCE,	V4L2_CID_WHITE_BALANCE_TEMPERATURE,	white_balance);
-	SET_CID_AUTO	(V4L2_CID_AUTOGAIN,				V4L2_CID_GAIN,						gain);
+#	define CONTROL_AUTO_CID(_cid_auto, _cid_manual, _field) { \
+			if (dev->ctl._field.mode == CTL_MODE_VALUE) { \
+				SET_CID_VALUE(_cid_auto, _field##_auto, 0, true); \
+				SET_CID_VALUE(_cid_manual, _field, dev->ctl._field.value, false); \
+			} else if (dev->ctl._field.mode == CTL_MODE_AUTO) { \
+				SET_CID_VALUE(_cid_auto, _field##_auto, 1, false); \
+			} else if (dev->ctl._field.mode == CTL_MODE_DEFAULT) { \
+				SET_CID_VALUE(_cid_auto, _field##_auto, 0, true); /* Reset inactive flag */ \
+				SET_CID_DEFAULT(_cid_manual, _field, false); \
+				SET_CID_DEFAULT(_cid_auto, _field##_auto, false); \
+			} \
+		}
 
-#	undef SET_CID_AUTO
-#	undef SET_CID_MANUAL
-#	undef SET_CID
+	CONTROL_AUTO_CID	(V4L2_CID_AUTOBRIGHTNESS,		V4L2_CID_BRIGHTNESS,				brightness);
+	CONTROL_MANUAL_CID	(								V4L2_CID_CONTRAST,					contrast);
+	CONTROL_MANUAL_CID	(								V4L2_CID_SATURATION,				saturation);
+	CONTROL_AUTO_CID	(V4L2_CID_HUE_AUTO,				V4L2_CID_HUE,						hue);
+	CONTROL_MANUAL_CID	(								V4L2_CID_GAMMA,						gamma);
+	CONTROL_MANUAL_CID	(								V4L2_CID_SHARPNESS,					sharpness);
+	CONTROL_MANUAL_CID	(								V4L2_CID_BACKLIGHT_COMPENSATION,	backlight_compensation);
+	CONTROL_AUTO_CID	(V4L2_CID_AUTO_WHITE_BALANCE,	V4L2_CID_WHITE_BALANCE_TEMPERATURE,	white_balance);
+	CONTROL_AUTO_CID	(V4L2_CID_AUTOGAIN,				V4L2_CID_GAIN,						gain);
+
+#	undef CONTROL_AUTO_CID
+#	undef CONTROL_MANUAL_CID
+#	undef SET_CID_DEFAULT
+#	undef SET_CID_VALUE
 }
 
-static int _device_check_control(struct device_t *dev, const char *name, unsigned cid, int value, bool quiet) {
-	struct v4l2_queryctrl query;
+static int _device_query_control(struct device_t *dev, struct v4l2_queryctrl *query, const char *name, unsigned cid, bool quiet) {
+	MEMSET_ZERO(*query);
+	query->id = cid;
 
-	MEMSET_ZERO(query);
-	query.id = cid;
-
-	if (xioctl(dev->run->fd, VIDIOC_QUERYCTRL, &query) < 0 || query.flags & V4L2_CTRL_FLAG_DISABLED) {
+	if (xioctl(dev->run->fd, VIDIOC_QUERYCTRL, query) < 0 || query->flags & V4L2_CTRL_FLAG_DISABLED) {
 		if (!quiet) {
 			LOG_ERROR("Changing control %s is unsupported", name);
 		}
 		return -1;
 	}
-	if (value < query.minimum || value > query.maximum || value % query.step != 0) {
-		if (!quiet) {
-			LOG_ERROR("Invalid value %d of control %s: min=%d, max=%d, default=%d, step=%u",
-				value, name, query.minimum, query.maximum, query.default_value, query.step);
-		}
-		return -2;
-	}
 	return 0;
 }
 
-static void _device_set_control(struct device_t *dev, const char *name, unsigned cid, int value, bool quiet) {
+static void _device_set_control(struct device_t *dev, struct v4l2_queryctrl *query, const char *name, unsigned cid, int value, bool quiet) {
 	struct v4l2_control ctl;
 
+	if (value < query->minimum || value > query->maximum || value % query->step != 0) {
+		if (!quiet) {
+			LOG_ERROR("Invalid value %d of control %s: min=%d, max=%d, default=%d, step=%u",
+				value, name, query->minimum, query->maximum, query->default_value, query->step);
+		}
+		return;
+	}
+
 	MEMSET_ZERO(ctl);
 	ctl.id = cid;
 	ctl.value = value;
@@ -678,7 +695,7 @@ static void _device_set_control(struct device_t *dev, const char *name, unsigned
 			LOG_PERROR("Can't set control %s", name);
 		}
 	} else if (!quiet) {
-		LOG_INFO("Using control %s: %d", name, ctl.value);
+		LOG_INFO("Applying control %s: %d", name, ctl.value);
 	}
 }
 

src/device.h

@@ -64,10 +64,16 @@ struct device_runtime_t {
 	bool				capturing;
 };
 
+enum control_mode_t {
+	CTL_MODE_NONE = 0,
+	CTL_MODE_VALUE,
+	CTL_MODE_AUTO,
+	CTL_MODE_DEFAULT,
+};
+
 struct control_t {
-	int		value;
-	bool	value_set;
-	bool	auto_set;
+	enum control_mode_t	mode;
+	int					value;
 };
 
 struct controls_t {

src/http/mime.c

@@ -56,7 +56,7 @@ const char *guess_mime_type(const char *path) {
 	char *dot;
 	char *ext;
 
-	dot = strchr(path, '.');
+	dot = strrchr(path, '.');
 	if (dot == NULL || strchr(dot, '/') != NULL) {
 		goto misc;
 	}

src/http/server.c

@@ -50,6 +50,7 @@
 #include "../tools.h"
 #include "../threading.h"
 #include "../logging.h"
+#include "../process.h"
 #include "../picture.h"
 #include "../encoder.h"
 #include "../stream.h"
@@ -157,6 +158,7 @@ void http_server_destroy(struct http_server_t *server) {
 int http_server_listen(struct http_server_t *server) {
 	{
 		if (server->static_path[0] != '\0') {
+			LOG_INFO("Enabling HTTP file server: %s", server->static_path);
 			evhttp_set_gencb(server->run->http, _http_callback_static, (void *)server);
 		} else {
 			assert(!evhttp_set_cb(server->run->http, "/", _http_callback_root, (void *)server));
@@ -175,6 +177,9 @@ int http_server_listen(struct http_server_t *server) {
 	EXPOSED(expose_begin_ts) = get_now_monotonic();
 	EXPOSED(expose_cmp_ts) = EXPOSED(expose_begin_ts);
 	EXPOSED(expose_end_ts) = EXPOSED(expose_begin_ts);
+	// See _http_exposed_refresh()
+	EXPOSED(notify_last_width) = EXPOSED(picture->width);
+	EXPOSED(notify_last_height) = EXPOSED(picture->height);
 #	undef EXPOSED
 
 	{
@@ -326,7 +331,7 @@ static void _http_callback_static(struct evhttp_request *request, void *v_server
 		goto not_found;
 	}
 
-	if (evbuffer_add_file(buf, fd, 0, st.st_size) < 0) {
+	if (st.st_size > 0 && evbuffer_add_file(buf, fd, 0, st.st_size) < 0) {
 		LOG_ERROR("HTTP: Can't serve static file %s", static_path);
 		goto not_found;
 	}
@@ -790,6 +795,25 @@ static void _http_exposed_refresh(UNUSED int fd, UNUSED short what, void *v_serv
 #	undef UNLOCK_STREAM
 
 	_http_queue_send_stream(server, stream_updated, picture_updated);
+
+#	define EXPOSED(_next) server->run->exposed->_next
+
+	if (
+		picture_updated
+		&& server->notify_parent
+		&& (
+			EXPOSED(notify_last_online) != EXPOSED(online)
+			|| EXPOSED(notify_last_width) != EXPOSED(picture->width)
+			|| EXPOSED(notify_last_height) != EXPOSED(picture->height)
+		)
+	) {
+		EXPOSED(notify_last_online) = EXPOSED(online);
+		EXPOSED(notify_last_width) = EXPOSED(picture->width);
+		EXPOSED(notify_last_height) = EXPOSED(picture->height);
+		process_notify_parent();
+	}
+
+#	undef EXPOSED
 }
 
 static bool _expose_new_picture_unsafe(struct http_server_t *server) {

src/http/server.h

@@ -65,6 +65,10 @@ struct exposed_t {
 	long double			expose_cmp_ts;
 	long double			expose_end_ts;
 	long double			last_as_blank_ts;
+
+	bool		notify_last_online;
+	unsigned	notify_last_width;
+	unsigned	notify_last_height;
 };
 
 struct http_server_runtime_t {
@@ -100,6 +104,8 @@ struct http_server_t {
 	unsigned	fake_width;
 	unsigned	fake_height;
 
+	bool		notify_parent;
+
 	struct http_server_runtime_t *run;
 };
 

src/main.c

@@ -25,6 +25,11 @@
 #	error WTF dude? Asserts are good things!
 #endif
 
+#include <limits.h>
+#if CHAR_BIT != 8
+#	error There are not 8 bits in a char!
+#endif
+
 #include <stdio.h>
 #include <signal.h>
 

src/options.c

@@ -26,6 +26,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
+#include <strings.h>
 #include <ctype.h>
 #include <limits.h>
 #include <getopt.h>
@@ -80,19 +81,16 @@ enum _OPT_VALUES {
 	_O_DEVICE_TIMEOUT = 10000,
 	_O_DEVICE_ERROR_DELAY,
 
+	_O_IMAGE_DEFAULT,
 	_O_BRIGHTNESS,
-	_O_BRIGHTNESS_AUTO,
 	_O_CONTRAST,
 	_O_SATURATION,
 	_O_HUE,
-	_O_HUE_AUTO,
 	_O_GAMMA,
 	_O_SHARPNESS,
 	_O_BACKLIGHT_COMPENSATION,
 	_O_WHITE_BALANCE,
-	_O_WHITE_BALANCE_AUTO,
 	_O_GAIN,
-	_O_GAIN_AUTO,
 
 	_O_USER,
 	_O_PASSWD,
@@ -112,6 +110,7 @@ enum _OPT_VALUES {
 #ifdef WITH_SETPROCTITLE
 	_O_PROCESS_NAME_PREFIX,
 #endif
+	_O_NOTIFY_PARENT,
 
 	_O_LOG_LEVEL,
 	_O_PERF,
@@ -143,19 +142,16 @@ static const struct option _LONG_OPTS[] = {
 	{"device-timeout",			required_argument,	NULL,	_O_DEVICE_TIMEOUT},
 	{"device-error-delay",		required_argument,	NULL,	_O_DEVICE_ERROR_DELAY},
 
+	{"image-default",			no_argument,		NULL,	_O_IMAGE_DEFAULT},
 	{"brightness",				required_argument,	NULL,	_O_BRIGHTNESS},
-	{"brightness-auto",			no_argument,		NULL,	_O_BRIGHTNESS_AUTO},
 	{"contrast",				required_argument,	NULL,	_O_CONTRAST},
 	{"saturation",				required_argument,	NULL,	_O_SATURATION},
 	{"hue",						required_argument,	NULL,	_O_HUE},
-	{"hue-auto",				no_argument,		NULL,	_O_HUE_AUTO},
 	{"gamma",					required_argument,	NULL,	_O_GAMMA},
 	{"sharpness",				required_argument,	NULL,	_O_SHARPNESS},
 	{"backlight-compensation",	required_argument,	NULL,	_O_BACKLIGHT_COMPENSATION},
 	{"white-balance",			required_argument,	NULL,	_O_WHITE_BALANCE},
-	{"white-balance-auto",		no_argument,		NULL,	_O_WHITE_BALANCE_AUTO},
 	{"gain",					required_argument,	NULL,	_O_GAIN},
-	{"gain-auto",				no_argument,		NULL,	_O_GAIN_AUTO},
 
 	{"host",					required_argument,	NULL,	_O_HOST},
 	{"port",					required_argument,	NULL,	_O_PORT},
@@ -185,6 +181,7 @@ static const struct option _LONG_OPTS[] = {
 #ifdef WITH_SETPROCTITLE
 	{"process-name-prefix",		required_argument,	NULL,	_O_PROCESS_NAME_PREFIX},
 #endif
+	{"notify-parent",			no_argument,		NULL,	_O_NOTIFY_PARENT},
 
 	{"log-level",				required_argument,	NULL,	_O_LOG_LEVEL},
 	{"perf",					no_argument,		NULL,	_O_PERF},
@@ -275,16 +272,29 @@ int options_parse(struct options_t *options, struct device_t *dev, struct encode
 			break; \
 		}
 
-#	define OPT_CTL(_dest) { \
-			dev->ctl._dest.value_set = true; \
-			dev->ctl._dest.auto_set = false; \
-			OPT_NUMBER("--"#_dest, dev->ctl._dest.value, INT_MIN, INT_MAX, 0); \
+#	define OPT_CTL_DEFAULT_NOBREAK(_dest) { \
+			dev->ctl._dest.mode = CTL_MODE_DEFAULT; \
+		}
+
+#	define OPT_CTL_MANUAL(_dest) { \
+			if (!strcasecmp(optarg, "default")) { \
+				OPT_CTL_DEFAULT_NOBREAK(_dest); \
+			} else { \
+				dev->ctl._dest.mode = CTL_MODE_VALUE; \
+				OPT_NUMBER("--"#_dest, dev->ctl._dest.value, INT_MIN, INT_MAX, 0); \
+			} \
 			break; \
 		}
 
 #	define OPT_CTL_AUTO(_dest) { \
-			dev->ctl._dest.value_set = false; \
-			dev->ctl._dest.auto_set = true; \
+			if (!strcasecmp(optarg, "default")) { \
+				OPT_CTL_DEFAULT_NOBREAK(_dest); \
+			} else if (!strcasecmp(optarg, "auto")) { \
+				dev->ctl._dest.mode = CTL_MODE_AUTO; \
+			} else { \
+				dev->ctl._dest.mode = CTL_MODE_VALUE; \
+				OPT_NUMBER("--"#_dest, dev->ctl._dest.value, INT_MIN, INT_MAX, 0); \
+			} \
 			break; \
 		}
 
@@ -335,19 +345,26 @@ int options_parse(struct options_t *options, struct device_t *dev, struct encode
 			case _O_DEVICE_TIMEOUT:		OPT_NUMBER("--device-timeout", dev->timeout, 1, 60, 0);
 			case _O_DEVICE_ERROR_DELAY:	OPT_NUMBER("--device-error-delay", dev->error_delay, 1, 60, 0);
 
-			case _O_BRIGHTNESS:				OPT_CTL(brightness);
-			case _O_BRIGHTNESS_AUTO:		OPT_CTL_AUTO(brightness);
-			case _O_CONTRAST:				OPT_CTL(contrast);
-			case _O_SATURATION:				OPT_CTL(saturation);
-			case _O_HUE:					OPT_CTL(hue);
-			case _O_HUE_AUTO:				OPT_CTL_AUTO(hue);
-			case _O_GAMMA:					OPT_CTL(gamma);
-			case _O_SHARPNESS:				OPT_CTL(sharpness);
-			case _O_BACKLIGHT_COMPENSATION:	OPT_CTL(backlight_compensation);
-			case _O_WHITE_BALANCE:			OPT_CTL(white_balance);
-			case _O_WHITE_BALANCE_AUTO:		OPT_CTL_AUTO(white_balance);
-			case _O_GAIN:					OPT_CTL(gain);
-			case _O_GAIN_AUTO:				OPT_CTL_AUTO(gain);
+			case _O_IMAGE_DEFAULT:
+				OPT_CTL_DEFAULT_NOBREAK(brightness);
+				OPT_CTL_DEFAULT_NOBREAK(contrast);
+				OPT_CTL_DEFAULT_NOBREAK(saturation);
+				OPT_CTL_DEFAULT_NOBREAK(hue);
+				OPT_CTL_DEFAULT_NOBREAK(gamma);
+				OPT_CTL_DEFAULT_NOBREAK(sharpness);
+				OPT_CTL_DEFAULT_NOBREAK(backlight_compensation);
+				OPT_CTL_DEFAULT_NOBREAK(white_balance);
+				OPT_CTL_DEFAULT_NOBREAK(gain);
+				break;
+			case _O_BRIGHTNESS:				OPT_CTL_AUTO(brightness);
+			case _O_CONTRAST:				OPT_CTL_MANUAL(contrast);
+			case _O_SATURATION:				OPT_CTL_MANUAL(saturation);
+			case _O_HUE:					OPT_CTL_AUTO(hue);
+			case _O_GAMMA:					OPT_CTL_MANUAL(gamma);
+			case _O_SHARPNESS:				OPT_CTL_MANUAL(sharpness);
+			case _O_BACKLIGHT_COMPENSATION:	OPT_CTL_MANUAL(backlight_compensation);
+			case _O_WHITE_BALANCE:			OPT_CTL_AUTO(white_balance);
+			case _O_GAIN:					OPT_CTL_AUTO(gain);
 
 			case _O_HOST:				OPT_SET(server->host, optarg);
 			case _O_PORT:				OPT_NUMBER("--port", server->port, 1, 65535, 0);
@@ -381,6 +398,7 @@ int options_parse(struct options_t *options, struct device_t *dev, struct encode
 #			ifdef WITH_SETPROCTITLE
 			case _O_PROCESS_NAME_PREFIX:	OPT_SET(process_name_prefix, optarg);
 #			endif
+			case _O_NOTIFY_PARENT:			OPT_SET(server->notify_parent, true);
 
 			case _O_LOG_LEVEL:			OPT_NUMBER("--log-level", log_level, LOG_LEVEL_INFO, LOG_LEVEL_DEBUG, 0);
 			case _O_PERF:				OPT_SET(log_level, LOG_LEVEL_PERF);
@@ -405,7 +423,8 @@ int options_parse(struct options_t *options, struct device_t *dev, struct encode
 #	endif
 
 #	undef OPT_CTL_AUTO
-#	undef OPT_CTL
+#	undef OPT_CTL_MANUAL
+#	undef OPT_CTL_DEFAULT_NOBREAK
 #	undef OPT_PARSE
 #	undef OPT_RESOLUTION
 #	undef OPT_NUMBER
@@ -562,19 +581,17 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
 	printf("                                           after an error (timeout for example). 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("    --image-default  ────────────────────── Reset all image settings bellow to default. Default: no change.\n\n");
+	printf("    --brightness <N|auto|default>  ──────── Set brightness. Default: no change.\n\n");
+	printf("    --contrast <N|default>  ─────────────── Set contrast. Default: no change.\n\n");
+	printf("    --saturation <N|default>  ───────────── Set saturation. Default: no change.\n\n");
+	printf("    --hue <N|auto|default>  ─────────────── Set hue. Default: no change.\n\n");
+	printf("    --gamma <N|default> ─────────────────── Set gamma. Default: no change.\n\n");
+	printf("    --sharpness <N|default>  ────────────── Set sharpness. Default: no change.\n\n");
+	printf("    --backlight-compensation <N|default>  ─ Set backlight compensation. Default: no change.\n\n");
+	printf("    --white-balance <N|auto|default>  ───── Set white balance. Default: no change.\n\n");
+	printf("    --gain <N|auto|default>  ────────────── Set gain. Default: no change.\n\n");
+	printf("    Hint: use v4l2-ctl --list-ctrls-menus to query available controls of the device.\n\n");
 	printf("HTTP server options:\n");
 	printf("════════════════════\n");
 	printf("    -s|--host <address>  ──────── Listen on Hostname or IP. Default: %s.\n\n", server->host);
@@ -619,6 +636,8 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
 #ifdef WITH_SETPROCTITLE
 	printf("    --process-name-prefix <str>  ── Set process name prefix which will be displayed in the process list\n");
 	printf("                                    like '<str>: ustreamer --blah-blah-blah'. Default: disabled.\n\n");
+	printf("    --notify-parent  ────────────── Send SIGUSR2 to the parent process when the stream parameters are changed.\n");
+	printf("                                    Checking changes is performed for the online flag and image resolution.\n\n");
 #endif
 	printf("Logging options:\n");
 	printf("════════════════\n");

src/process.h

@@ -22,6 +22,12 @@
 
 #pragma once
 
+#include <signal.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+
+
 #if defined(__linux__)
 #	define HAS_PDEATHSIG
 #elif defined(__FreeBSD__)
@@ -32,19 +38,14 @@
 #endif
 
 
-#ifdef HAS_PDEATHSIG
-#	include <signal.h>
-#	include <unistd.h>
-#endif
 #ifdef WITH_SETPROCTITLE
 #	include <stdlib.h>
 #	include <string.h>
 #	if defined(__linux__)
 #		include <bsd/unistd.h>
-#		include <sys/types.h>
 #	elif (defined(__FreeBSD__) || defined(__DragonFly__))
-#		include <unistd.h>
-#		include <sys/types.h>
+//#		include <unistd.h>
+//#		include <sys/types.h>
 #	elif (defined(__NetBSD__) || defined(__OpenBSD__)) // setproctitle() placed in stdlib.h
 #	else
 #		error setproctitle() not implemented, you can disable it using WITH_SETPROCTITLE=0
@@ -72,6 +73,7 @@ extern char **environ;
 
 #ifdef HAS_PDEATHSIG
 INLINE int process_track_parent_death(void) {
+	pid_t parent = getppid();
 	int signum = SIGTERM;
 #	if defined(__linux__)
 	int retval = prctl(PR_SET_PDEATHSIG, signum);
@@ -85,8 +87,8 @@ INLINE int process_track_parent_death(void) {
 		return -1;
 	}
 
-	if (kill(getppid(), 0) < 0) {
-		LOG_PERROR("The parent process is already dead");
+	if (kill(parent, 0) < 0) {
+		LOG_PERROR("The parent process %d is already dead", parent);
 		return -1;
 	}
 
@@ -128,3 +130,11 @@ INLINE void process_set_name_prefix(int argc, char *argv[], const char *prefix)
 	free(cmdline);
 }
 #endif
+
+INLINE void process_notify_parent(void) {
+	pid_t parent = getppid();
+
+	if (kill(parent, SIGUSR2) < 0) {
+		LOG_PERROR("Can't send SIGUSR2 to the parent process %d", parent);
+	}
+}