Bump version: 0.55 → 0.56

.bumpversion.cfg

@@ -1,7 +1,7 @@
 [bumpversion]
 commit = True
 tag = True
-current_version = 0.55
+current_version = 0.56
 parse = (?P<major>\d+)\.(?P<minor>\d+)(\.(?P<patch>\d+)(\-(?P<release>[a-z]+))?)?
 serialize = 
 	{major}.{minor}

PKGBUILD

@@ -3,7 +3,7 @@
 
 
 pkgname=ustreamer
-pkgver=0.55
+pkgver=0.56
 pkgrel=1
 pkgdesc="Lightweight and fast MJPG-HTTP streamer"
 url="https://github.com/pi-kvm/ustreamer"

src/config.h

@@ -22,4 +22,4 @@
 
 #pragma once
 
-#define VERSION "0.55"
+#define VERSION "0.56"

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;
 };
 
 

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/http.c

@@ -147,6 +147,10 @@ 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 +268,10 @@ 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()));
 
@@ -406,6 +410,10 @@ 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,
@@ -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) {
@@ -638,11 +653,11 @@ static void _http_exposed_refresh(UNUSED int fd, UNUSED short what, void *v_serv
 	bool picture_updated = false;
 
 #	define UNLOCK_STREAM \
-		{ server->run->stream->updated = false; A_PTHREAD_M_UNLOCK(&server->run->stream->mutex); }
+		{ server->run->stream->updated = false; A_MUTEX_UNLOCK(&server->run->stream->mutex); }
 
 	if (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

@@ -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,	3000},
 	{"fake-width",				required_argument,	NULL,	3001},
 	{"fake-height",				required_argument,	NULL,	3002},
 	{"server-timeout",			required_argument,	NULL,	3003},
@@ -162,6 +163,8 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
 	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("    --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);
@@ -271,6 +274,7 @@ 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);
@@ -375,10 +379,10 @@ 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 +20,7 @@
 *****************************************************************************/
 
 
+#include <unistd.h>
 #include <errno.h>
 #include <time.h>
 #include <assert.h>
@@ -40,12 +41,12 @@
 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 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);
 
 static int _stream_control(struct device_t *dev, bool enable);
 static int _stream_grab_buffer(struct device_t *dev, struct v4l2_buffer *buf_info);
@@ -54,17 +55,22 @@ static int _stream_handle_event(struct device_t *dev);
 
 
 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);
+
 	A_CALLOC(stream, 1);
 	stream->dev = dev;
 	stream->encoder = encoder;
-	A_PTHREAD_M_INIT(&stream->mutex);
+	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);
 }
 
@@ -79,7 +85,7 @@ void stream_loop(struct stream_t *stream) {
 	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;
@@ -93,24 +99,24 @@ void stream_loop(struct stream_t *stream) {
 
 		LOG_INFO("Capturing ...");
 
-		while (!stream->dev->stop) {
+		while (!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 && !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);
@@ -133,10 +139,14 @@ void stream_loop(struct stream_t *stream) {
 				LOG_PERF("----- Raw frame dropped;  worker = %u", free_worker_number);
 			}
 
-			if (stream->dev->stop) {
+			if (stream->proc->stop) {
 				break;
 			}
 
+			if (stream->proc->slowdown) {
+				usleep(1000000);
+			}
+
 #			define INIT_FD_SET(_set) \
 				fd_set _set; FD_ZERO(&_set); FD_SET(stream->dev->run->fd, &_set);
 
@@ -222,7 +232,7 @@ 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];
@@ -240,17 +250,17 @@ 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;
+					A_MUTEX_LOCK(&FREE_WORKER(has_job_mutex));
+					FREE_WORKER(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_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
 
@@ -277,28 +287,32 @@ void stream_loop(struct stream_t *stream) {
 			}
 		}
 
-		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);
+		A_MUTEX_UNLOCK(&stream->mutex);
 	}
 
-	_stream_destroy_workers(stream->dev, &pool);
+	_stream_destroy_workers(stream, &pool);
 	_stream_control(stream->dev, false);
 	device_close(stream->dev);
 }
 
 void stream_loop_break(struct stream_t *stream) {
-	stream->dev->stop = 1;
+	stream->proc->stop = 1;
+}
+
+void stream_switch_slowdown(struct stream_t *stream, bool slowdown) {
+	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);
@@ -313,7 +327,7 @@ static void _stream_expose_picture(struct stream_t *stream, unsigned buf_index)
 	stream->height = stream->dev->run->height;
 	stream->updated = true;
 
-	A_PTHREAD_M_UNLOCK(&stream->mutex);
+	A_MUTEX_UNLOCK(&stream->mutex);
 
 #	undef PICTURE
 }
@@ -327,11 +341,11 @@ 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 +362,14 @@ 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__, stream->proc->stop);
+	while (!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;
 		}
@@ -363,150 +377,139 @@ 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);
+	_stream_control(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 (_stream_control(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);
+	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));
+		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)		= (sig_atomic_t *volatile)&(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 (!*worker->proc_stop && !*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(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 (!*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 (_stream_release_buffer(worker->dev, &worker->buf_info) == 0) {
+				worker->job_start_time = PICTURE(encode_begin_time);
+				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;
+				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) {
+		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));
+			A_MUTEX_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_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);
 	}

src/stream.h

@@ -31,45 +31,32 @@
 #include "encoder.h"
 
 
-struct worker_context_t {
+struct worker_t {
+	pthread_t			tid;
 	unsigned			number;
-	struct device_t		*dev;
-	int					buf_index;
-	struct v4l2_buffer	buf_info;
-	sig_atomic_t		*volatile dev_stop;
+	sig_atomic_t		*volatile proc_stop;
 	bool				*workers_stop;
 
-	struct encoder_t	*encoder;
+	pthread_mutex_t		last_comp_time_mutex;
+	long double			last_comp_time;
 
-	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;
+	pthread_mutex_t		has_job_mutex;
+	int					buf_index;
+	struct v4l2_buffer	buf_info;
+	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 {
@@ -83,6 +70,11 @@ struct workers_pool_t {
 	struct encoder_t	*encoder;
 };
 
+struct process_t {
+	sig_atomic_t volatile	stop;
+	bool					slowdown;
+};
+
 struct stream_t {
 	struct picture_t	picture;
 	unsigned			width;
@@ -90,6 +82,8 @@ struct stream_t {
 	unsigned			captured_fps;
 	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)))))