2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2004,2005 Wim Taymans <wim@fluendo.com>
5 * gstpipeline.c: Overall pipeline management element
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
24 * @short_description: Top-level bin with scheduling and pipeline management functionality.
27 * In almost all cases, you'll want to use a GstPipeline when creating a filter
28 * graph. The GstPipeline will manage all the scheduling issues, including
29 * threading, as well as provide simple interfaces to common functions, like
32 * gst_pipeline_new() is used to create a pipeline. when you are done with
33 * the pipeline, use gst_object_unref() to free its resources including all
34 * added #GstElement objects (if not otherwiese referenced).
37 #include "gst_private.h"
39 #include "gstpipeline.h"
41 #include "gstsystemclock.h"
43 static GstElementDetails gst_pipeline_details =
44 GST_ELEMENT_DETAILS ("Pipeline object",
46 "Complete pipeline object",
47 "Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
49 /* Pipeline signals and args */
56 #define DEFAULT_DELAY 0
57 #define DEFAULT_PLAY_TIMEOUT (2*GST_SECOND)
67 static void gst_pipeline_base_init (gpointer g_class);
68 static void gst_pipeline_class_init (gpointer g_class, gpointer class_data);
69 static void gst_pipeline_init (GTypeInstance * instance, gpointer g_class);
71 static void gst_pipeline_dispose (GObject * object);
72 static void gst_pipeline_set_property (GObject * object, guint prop_id,
73 const GValue * value, GParamSpec * pspec);
74 static void gst_pipeline_get_property (GObject * object, guint prop_id,
75 GValue * value, GParamSpec * pspec);
77 static gboolean gst_pipeline_send_event (GstElement * element,
80 static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
81 static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
82 GstStateChange transition);
84 static GstBinClass *parent_class = NULL;
86 /* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
89 gst_pipeline_get_type (void)
91 static GType pipeline_type = 0;
94 static const GTypeInfo pipeline_info = {
95 sizeof (GstPipelineClass),
96 gst_pipeline_base_init,
98 (GClassInitFunc) gst_pipeline_class_init,
101 sizeof (GstPipeline),
108 g_type_register_static (GST_TYPE_BIN, "GstPipeline", &pipeline_info, 0);
110 return pipeline_type;
114 gst_pipeline_base_init (gpointer g_class)
116 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
118 gst_element_class_set_details (gstelement_class, &gst_pipeline_details);
122 gst_pipeline_class_init (gpointer g_class, gpointer class_data)
124 GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
125 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
126 GstPipelineClass *klass = GST_PIPELINE_CLASS (g_class);
128 parent_class = g_type_class_peek_parent (klass);
130 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pipeline_set_property);
131 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pipeline_get_property);
133 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DELAY,
134 g_param_spec_uint64 ("delay", "Delay",
135 "Expected delay needed for elements "
136 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
138 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PLAY_TIMEOUT,
139 g_param_spec_uint64 ("play-timeout", "Play Timeout",
140 "Max timeout for going to PLAYING in nanoseconds", 0, G_MAXUINT64,
141 DEFAULT_PLAY_TIMEOUT, G_PARAM_READWRITE));
143 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
145 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_pipeline_send_event);
146 gstelement_class->change_state =
147 GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
148 gstelement_class->provide_clock =
149 GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
153 gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
155 GstPipeline *pipeline = GST_PIPELINE (instance);
158 pipeline->delay = DEFAULT_DELAY;
159 pipeline->play_timeout = DEFAULT_PLAY_TIMEOUT;
161 bus = g_object_new (gst_bus_get_type (), NULL);
162 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
163 gst_object_unref (bus);
167 gst_pipeline_dispose (GObject * object)
169 GstPipeline *pipeline = GST_PIPELINE (object);
171 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
173 gst_object_replace ((GstObject **) & pipeline->fixed_clock, NULL);
175 G_OBJECT_CLASS (parent_class)->dispose (object);
179 gst_pipeline_set_property (GObject * object, guint prop_id,
180 const GValue * value, GParamSpec * pspec)
182 GstPipeline *pipeline = GST_PIPELINE (object);
187 pipeline->delay = g_value_get_uint64 (value);
189 case ARG_PLAY_TIMEOUT:
190 pipeline->play_timeout = g_value_get_uint64 (value);
193 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
196 GST_UNLOCK (pipeline);
200 gst_pipeline_get_property (GObject * object, guint prop_id,
201 GValue * value, GParamSpec * pspec)
203 GstPipeline *pipeline = GST_PIPELINE (object);
208 g_value_set_uint64 (value, pipeline->delay);
210 case ARG_PLAY_TIMEOUT:
211 g_value_set_uint64 (value, pipeline->play_timeout);
214 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
217 GST_UNLOCK (pipeline);
221 do_pipeline_seek (GstElement * element, GstEvent * event)
226 gboolean was_playing = FALSE;
229 gst_event_parse_seek (event, &rate, NULL, &flags, NULL, NULL, NULL, NULL);
231 flush = flags & GST_SEEK_FLAG_FLUSH;
237 GST_TIME_TO_TIMEVAL (0, timeout);
238 /* need to call _get_state() since a bin state is only updated
240 gst_element_get_state (element, &state, NULL, &timeout);
241 was_playing = state == GST_STATE_PLAYING;
244 gst_element_set_state (element, GST_STATE_PAUSED);
247 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
250 /* need to reset the stream time to 0 after a flushing seek */
251 gst_pipeline_set_new_stream_time (GST_PIPELINE (element), 0);
253 /* and continue playing */
254 gst_element_set_state (element, GST_STATE_PLAYING);
260 /* sending a seek event on the pipeline pauses the pipeline if it
264 gst_pipeline_send_event (GstElement * element, GstEvent * event)
267 GstEventType event_type = GST_EVENT_TYPE (event);
269 switch (event_type) {
271 res = do_pipeline_seek (element, event);
274 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
283 * @name: name of new pipeline
285 * Create a new pipeline with the given name.
287 * Returns: newly created GstPipeline
292 gst_pipeline_new (const gchar * name)
294 return gst_element_factory_make ("pipeline", name);
298 static GstStateChangeReturn
299 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
301 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
302 GstPipeline *pipeline = GST_PIPELINE (element);
303 GstClockTime play_timeout;
306 switch (transition) {
307 case GST_STATE_CHANGE_NULL_TO_READY:
310 gst_bus_set_flushing (element->bus, FALSE);
311 GST_UNLOCK (element);
313 case GST_STATE_CHANGE_READY_TO_PAUSED:
315 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
316 /* when going to playing, select a clock */
317 if ((clock = gst_element_provide_clock (element))) {
318 GstClockTime start_time;
322 start_time = gst_clock_get_time (clock);
325 new_clock = element->clock != clock;
326 element->base_time = start_time -
327 pipeline->stream_time + pipeline->delay;
328 GST_DEBUG ("stream_time=%" GST_TIME_FORMAT ", start_time=%"
329 GST_TIME_FORMAT ", base time %" GST_TIME_FORMAT,
330 GST_TIME_ARGS (pipeline->stream_time),
331 GST_TIME_ARGS (start_time), GST_TIME_ARGS (element->base_time));
332 GST_UNLOCK (element);
334 /* now distribute the clock */
335 gst_element_set_clock (element, clock);
338 /* if we selected a new clock, let the app know about it */
339 gst_element_post_message (element,
340 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
343 gst_object_unref (clock);
345 GST_DEBUG ("no clock, using base time of 0");
346 gst_element_set_base_time (element, 0);
349 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
350 case GST_STATE_CHANGE_PAUSED_TO_READY:
351 case GST_STATE_CHANGE_READY_TO_NULL:
355 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
357 switch (transition) {
358 case GST_STATE_CHANGE_NULL_TO_READY:
360 case GST_STATE_CHANGE_READY_TO_PAUSED:
361 gst_pipeline_set_new_stream_time (pipeline, 0);
363 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
365 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
367 if ((clock = element->clock)) {
370 gst_object_ref (clock);
371 GST_UNLOCK (element);
373 /* calculate the time when we stopped */
374 now = gst_clock_get_time (clock);
375 gst_object_unref (clock);
378 /* store the current stream time */
379 pipeline->stream_time = now - element->base_time;
380 GST_DEBUG ("stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
381 ", base time %" GST_TIME_FORMAT,
382 GST_TIME_ARGS (pipeline->stream_time),
383 GST_TIME_ARGS (now), GST_TIME_ARGS (element->base_time));
385 GST_UNLOCK (element);
387 case GST_STATE_CHANGE_PAUSED_TO_READY:
389 case GST_STATE_CHANGE_READY_TO_NULL:
392 gst_bus_set_flushing (element->bus, TRUE);
394 GST_UNLOCK (element);
398 if (result == GST_STATE_CHANGE_ASYNC) {
400 play_timeout = pipeline->play_timeout;
401 GST_UNLOCK (pipeline);
406 /* we wait for async state changes ourselves when we are in an
407 * intermediate state. */
408 if (play_timeout > 0) {
409 GTimeVal *timeval, timeout;
411 GST_STATE_UNLOCK (pipeline);
413 if (play_timeout == G_MAXUINT64) {
416 GST_TIME_TO_TIMEVAL (play_timeout, timeout);
420 result = gst_element_get_state (element, NULL, NULL, timeval);
421 if (result == GST_STATE_CHANGE_ASYNC) {
422 GST_WARNING_OBJECT (pipeline,
423 "timeout in PREROLL, forcing next state change");
424 g_warning ("timeout in PREROLL, forcing next state change");
425 result = GST_STATE_CHANGE_SUCCESS;
428 GST_STATE_LOCK (pipeline);
435 * gst_pipeline_get_bus:
436 * @pipeline: the pipeline
438 * Gets the #GstBus of this pipeline.
445 gst_pipeline_get_bus (GstPipeline * pipeline)
447 return gst_element_get_bus (GST_ELEMENT (pipeline));
451 * gst_pipeline_set_new_stream_time:
452 * @pipeline: the pipeline
453 * @time: the new stream time to set
455 * Set the new stream time of the pipeline. The stream time is used to
456 * set the base time on the elements (see @gst_element_set_base_time())
457 * in the PAUSED->PLAYING state transition.
462 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
464 g_return_if_fail (GST_IS_PIPELINE (pipeline));
467 pipeline->stream_time = time;
468 GST_DEBUG ("%s: set new stream_time to %" GST_TIME_FORMAT,
469 GST_ELEMENT_NAME (pipeline), GST_TIME_ARGS (time));
470 GST_UNLOCK (pipeline);
474 * gst_pipeline_get_last_stream_time:
475 * @pipeline: the pipeline
477 * Gets the last stream time of the pipeline. If the pipeline is PLAYING,
478 * the returned time is the stream time used to configure the elements
479 * in the PAUSED->PLAYING state. If the pipeline is PAUSED, the returned
480 * time is the stream time when the pipeline was paused.
482 * Returns: a GstClockTime
487 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
491 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
494 result = pipeline->stream_time;
495 GST_UNLOCK (pipeline);
501 gst_pipeline_provide_clock_func (GstElement * element)
503 GstClock *clock = NULL;
504 GstPipeline *pipeline = GST_PIPELINE (element);
506 /* if we have a fixed clock, use that one */
508 if (GST_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
509 clock = pipeline->fixed_clock;
510 gst_object_ref (clock);
511 GST_UNLOCK (pipeline);
513 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
514 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
516 GST_UNLOCK (pipeline);
518 GST_ELEMENT_CLASS (parent_class)->
519 provide_clock (GST_ELEMENT (pipeline));
520 /* no clock, use a system clock */
522 clock = gst_system_clock_obtain ();
524 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
525 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
527 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
528 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
535 * gst_pipeline_get_clock:
536 * @pipeline: the pipeline
538 * Gets the current clock used by the pipeline.
540 * Returns: a GstClock
543 gst_pipeline_get_clock (GstPipeline * pipeline)
545 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
547 return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
552 * gst_pipeline_use_clock:
553 * @pipeline: the pipeline
554 * @clock: the clock to use
556 * Force the pipeline to use the given clock. The pipeline will
557 * always use the given clock even if new clock providers are added
563 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
565 g_return_if_fail (GST_IS_PIPELINE (pipeline));
568 GST_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
570 gst_object_replace ((GstObject **) & pipeline->fixed_clock,
571 (GstObject *) clock);
572 GST_UNLOCK (pipeline);
574 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
575 (clock ? GST_OBJECT_NAME (clock) : "nil"));
579 * gst_pipeline_set_clock:
580 * @pipeline: the pipeline
581 * @clock: the clock to set
583 * Set the clock for the pipeline. The clock will be distributed
584 * to all the elements managed by the pipeline.
589 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
591 g_return_if_fail (pipeline != NULL);
592 g_return_if_fail (GST_IS_PIPELINE (pipeline));
594 GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline), clock);
598 * gst_pipeline_auto_clock:
599 * @pipeline: the pipeline
601 * Let the pipeline select a clock automatically.
606 gst_pipeline_auto_clock (GstPipeline * pipeline)
608 g_return_if_fail (pipeline != NULL);
609 g_return_if_fail (GST_IS_PIPELINE (pipeline));
612 GST_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
614 gst_object_replace ((GstObject **) & pipeline->fixed_clock, NULL);
615 GST_UNLOCK (pipeline);
617 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");