gstreamer/gst/gstpipeline.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2004,2005 Wim Taymans <wim@fluendo.com>
*
* gstpipeline.c: Overall pipeline management element
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstpipeline
* @short_description: Top-level bin with clocking and bus management functionality.
* @see_also: #GstBin
*
* In almost all cases, you'll want to use a GstPipeline when creating a filter
* graph. The GstPipeline will manage the selection and distribution of a global
* clock as well as provide a GstBus to the application.
*
* The pipeline will also use the selected clock to calculate the stream time of
* the pipeline.
*
* When sending a seek event to a GstPipeline, it will make sure that the
* pipeline is properly PAUSED and resumed as well as update the new stream time
* after the seek.
*
* gst_pipeline_new() is used to create a pipeline. when you are done with
* the pipeline, use gst_object_unref() to free its resources including all
* added #GstElement objects (if not otherwiese referenced).
*/
#include "gst_private.h"
#include "gstpipeline.h"
#include "gstinfo.h"
#include "gstsystemclock.h"
static GstElementDetails gst_pipeline_details =
GST_ELEMENT_DETAILS ("Pipeline object",
"Generic/Bin",
"Complete pipeline object",
"Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
/* Pipeline signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_DELAY 0
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enum
{
PROP_0,
PROP_DELAY,
/* FILL ME */
};
static void gst_pipeline_base_init (gpointer g_class);
static void gst_pipeline_class_init (gpointer g_class, gpointer class_data);
static void gst_pipeline_init (GTypeInstance * instance, gpointer g_class);
static void gst_pipeline_dispose (GObject * object);
static void gst_pipeline_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_pipeline_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_pipeline_send_event (GstElement * element,
GstEvent * event);
static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
GstStateChange transition);
WARNING: Don't grab this updated unless you're really, REALLY sure. Original commit message from CVS: WARNING: Don't grab this updated unless you're really, REALLY sure. WARNING: Wait for the next one. Whole lotta changes here, including a few random bits: examples/*/Makefile: updated to use `libtool gcc`, not just `gcc` gst/ gstbuffer.h: updated to new flag style gst.c, gstdebug.h: added new debugging for function ptrs gstpipeline.c: set type of parent_class to the class, not the object gstthread.c: ditto plugins/ cdparanoia/cdparanoia.c: added an argument type, updated some defaults cobin/spindentity.c: updated to new do/while loopfunction style mp3encode/lame/gstlame.c: argument types, whole lotta lame options tests/: various changes Now, for the big changes: Once again, the scheduling system has changed. And once again, it broke a whole bunch of things. The gist of the change is that there is now a function pointer for gst_pad_push and gst_pad_pull, instead of a hard-wired function. Well, currently they are functions, but that's for debugging purposes only, they just call the function pointer after spewing lots of DEBUG(). This changed the GstPad structure a bit, and the GstPad API as well. Where elements used to provide chain() and pull() functions, they provide chain() and get() functions. gst_pad_set_pull[region]_function has been changed to get_pad_set_get[region]_function. This means all the elements out there that used to have pull functions need to be updated. The calls to that function have been changed in the normal elements, but the names of the functions passed is still _pull[region](), which is an aesthetic issue more than anything. As for what doesn't work yet, just about anything dealing with Connections is hosed, meaning threaded stuff won't work. This will be fixed about 12 hours from now, after I've slept, etc. The simplefake.c test works in both cothreaded and chained cases, but not much else will work due to the Connection problem. Needless to say, don't grab this unless you *need* these features *now*, else wait to update this stuff until tomorrow. I'm going to sleep now.
2000-12-16 10:18:09 +00:00
static GstBinClass *parent_class = NULL;
/* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_pipeline_get_type (void)
{
static GType pipeline_type = 0;
if (!pipeline_type) {
static const GTypeInfo pipeline_info = {
sizeof (GstPipelineClass),
gst_pipeline_base_init,
NULL,
(GClassInitFunc) gst_pipeline_class_init,
NULL,
NULL,
sizeof (GstPipeline),
0,
gst_pipeline_init,
NULL
};
pipeline_type =
g_type_register_static (GST_TYPE_BIN, "GstPipeline", &pipeline_info, 0);
}
return pipeline_type;
}
static void
gst_pipeline_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_pipeline_details);
}
static void
gst_pipeline_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
GstPipelineClass *klass = GST_PIPELINE_CLASS (g_class);
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pipeline_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pipeline_get_property);
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELAY,
g_param_spec_uint64 ("delay", "Delay",
"Expected delay needed for elements "
"to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
G_PARAM_READWRITE));
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_pipeline_send_event);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
gstelement_class->provide_clock =
GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
}
static void
gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
{
GstPipeline *pipeline = GST_PIPELINE (instance);
GstBus *bus;
pipeline->delay = DEFAULT_DELAY;
bus = g_object_new (gst_bus_get_type (), NULL);
gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
gst_object_unref (bus);
}
static void
gst_pipeline_dispose (GObject * object)
{
GstPipeline *pipeline = GST_PIPELINE (object);
GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
gst_object_replace ((GstObject **) & pipeline->fixed_clock, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_pipeline_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPipeline *pipeline = GST_PIPELINE (object);
GST_LOCK (pipeline);
switch (prop_id) {
case PROP_DELAY:
pipeline->delay = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_UNLOCK (pipeline);
}
static void
gst_pipeline_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstPipeline *pipeline = GST_PIPELINE (object);
GST_LOCK (pipeline);
switch (prop_id) {
case PROP_DELAY:
g_value_set_uint64 (value, pipeline->delay);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_UNLOCK (pipeline);
}
static gboolean
do_pipeline_seek (GstElement * element, GstEvent * event)
{
gdouble rate;
GstSeekFlags flags;
gboolean flush;
gboolean was_playing = FALSE;
gboolean res;
gst_event_parse_seek (event, &rate, NULL, &flags, NULL, NULL, NULL, NULL);
flush = flags & GST_SEEK_FLAG_FLUSH;
if (flush) {
GstState state;
GTimeVal timeout;
GST_TIME_TO_TIMEVAL (0, timeout);
/* need to call _get_state() since a bin state is only updated
* with this call. */
gst_element_get_state (element, &state, NULL, &timeout);
was_playing = state == GST_STATE_PLAYING;
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if (was_playing) {
gst_element_set_state (element, GST_STATE_PAUSED);
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}
}
res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
if (flush && res) {
/* need to reset the stream time to 0 after a flushing seek */
gst_pipeline_set_new_stream_time (GST_PIPELINE (element), 0);
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if (was_playing)
/* and continue playing */
gst_element_set_state (element, GST_STATE_PLAYING);
}
return res;
}
/* sending a seek event on the pipeline pauses the pipeline if it
* was playing.
*/
static gboolean
gst_pipeline_send_event (GstElement * element, GstEvent * event)
{
gboolean res;
GstEventType event_type = GST_EVENT_TYPE (event);
switch (event_type) {
case GST_EVENT_SEEK:
res = do_pipeline_seek (element, event);
break;
default:
res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
break;
}
return res;
}
/**
* gst_pipeline_new:
* @name: name of new pipeline
*
* Create a new pipeline with the given name.
*
* Returns: newly created GstPipeline
*
* MT safe.
*/
GstElement *
gst_pipeline_new (const gchar * name)
{
return gst_element_factory_make ("pipeline", name);
}
/* MT safe */
static GstStateChangeReturn
gst_pipeline_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
GstPipeline *pipeline = GST_PIPELINE (element);
GstClock *clock;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
GST_LOCK (element);
if (element->bus)
gst_bus_set_flushing (element->bus, FALSE);
GST_UNLOCK (element);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
/* when going to playing, select a clock */
if ((clock = gst_element_provide_clock (element))) {
GstClockTime start_time;
gboolean new_clock;
/* get start time */
start_time = gst_clock_get_time (clock);
GST_LOCK (element);
new_clock = element->clock != clock;
element->base_time = start_time -
pipeline->stream_time + pipeline->delay;
GST_DEBUG ("stream_time=%" GST_TIME_FORMAT ", start_time=%"
GST_TIME_FORMAT ", base time %" GST_TIME_FORMAT,
GST_TIME_ARGS (pipeline->stream_time),
GST_TIME_ARGS (start_time), GST_TIME_ARGS (element->base_time));
GST_UNLOCK (element);
/* now distribute the clock */
gst_element_set_clock (element, clock);
if (new_clock) {
/* if we selected a new clock, let the app know about it */
gst_element_post_message (element,
gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
}
gst_object_unref (clock);
} else {
GST_DEBUG ("no clock, using base time of 0");
gst_element_set_base_time (element, 0);
}
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
case GST_STATE_CHANGE_PAUSED_TO_READY:
case GST_STATE_CHANGE_READY_TO_NULL:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_pipeline_set_new_stream_time (pipeline, 0);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_LOCK (element);
if ((clock = element->clock)) {
GstClockTime now;
gst_object_ref (clock);
GST_UNLOCK (element);
/* calculate the time when we stopped */
now = gst_clock_get_time (clock);
gst_object_unref (clock);
GST_LOCK (element);
/* store the current stream time */
pipeline->stream_time = now - element->base_time;
GST_DEBUG ("stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
", base time %" GST_TIME_FORMAT,
GST_TIME_ARGS (pipeline->stream_time),
GST_TIME_ARGS (now), GST_TIME_ARGS (element->base_time));
}
GST_UNLOCK (element);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
GST_LOCK (element);
if (element->bus) {
gst_bus_set_flushing (element->bus, TRUE);
}
GST_UNLOCK (element);
break;
}
return result;
}
/**
* gst_pipeline_get_bus:
* @pipeline: the pipeline
*
* Gets the #GstBus of this pipeline.
*
* Returns: a GstBus
*
* MT safe.
*/
GstBus *
gst_pipeline_get_bus (GstPipeline * pipeline)
{
return gst_element_get_bus (GST_ELEMENT (pipeline));
}
/**
* gst_pipeline_set_new_stream_time:
* @pipeline: the pipeline
* @time: the new stream time to set
*
* Set the new stream time of the pipeline. The stream time is used to
* set the base time on the elements (see @gst_element_set_base_time())
* in the PAUSED->PLAYING state transition.
*
* MT safe.
*/
void
gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
{
g_return_if_fail (GST_IS_PIPELINE (pipeline));
GST_LOCK (pipeline);
pipeline->stream_time = time;
GST_DEBUG ("%s: set new stream_time to %" GST_TIME_FORMAT,
GST_ELEMENT_NAME (pipeline), GST_TIME_ARGS (time));
GST_UNLOCK (pipeline);
}
/**
* gst_pipeline_get_last_stream_time:
* @pipeline: the pipeline
*
* Gets the last stream time of the pipeline. If the pipeline is PLAYING,
* the returned time is the stream time used to configure the elements
* in the PAUSED->PLAYING state. If the pipeline is PAUSED, the returned
* time is the stream time when the pipeline was paused.
*
* Returns: a GstClockTime
*
* MT safe.
*/
GstClockTime
gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
{
GstClockTime result;
g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
GST_LOCK (pipeline);
result = pipeline->stream_time;
GST_UNLOCK (pipeline);
return result;
}
static GstClock *
gst_pipeline_provide_clock_func (GstElement * element)
{
GstClock *clock = NULL;
GstPipeline *pipeline = GST_PIPELINE (element);
/* if we have a fixed clock, use that one */
GST_LOCK (pipeline);
if (GST_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
clock = pipeline->fixed_clock;
gst_object_ref (clock);
GST_UNLOCK (pipeline);
GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
} else {
GST_UNLOCK (pipeline);
clock =
GST_ELEMENT_CLASS (parent_class)->
provide_clock (GST_ELEMENT (pipeline));
/* no clock, use a system clock */
if (!clock) {
clock = gst_system_clock_obtain ();
GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
} else {
GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
}
}
return clock;
}
/**
* gst_pipeline_get_clock:
* @pipeline: the pipeline
*
* Gets the current clock used by the pipeline.
*
* Returns: a GstClock
*/
GstClock *
gst_pipeline_get_clock (GstPipeline * pipeline)
{
g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
}
/**
* gst_pipeline_use_clock:
* @pipeline: the pipeline
* @clock: the clock to use
*
* Force the pipeline to use the given clock. The pipeline will
* always use the given clock even if new clock providers are added
* to this pipeline.
*
* MT safe.
*/
void
gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
{
g_return_if_fail (GST_IS_PIPELINE (pipeline));
GST_LOCK (pipeline);
GST_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
gst_object_replace ((GstObject **) & pipeline->fixed_clock,
(GstObject *) clock);
GST_UNLOCK (pipeline);
GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
(clock ? GST_OBJECT_NAME (clock) : "nil"));
}
/**
* gst_pipeline_set_clock:
* @pipeline: the pipeline
* @clock: the clock to set
*
* Set the clock for the pipeline. The clock will be distributed
* to all the elements managed by the pipeline.
*
* MT safe.
*/
void
gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
{
g_return_if_fail (pipeline != NULL);
g_return_if_fail (GST_IS_PIPELINE (pipeline));
GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline), clock);
}
/**
* gst_pipeline_auto_clock:
* @pipeline: the pipeline
*
* Let the pipeline select a clock automatically.
*
* MT safe.
*/
void
gst_pipeline_auto_clock (GstPipeline * pipeline)
{
g_return_if_fail (pipeline != NULL);
g_return_if_fail (GST_IS_PIPELINE (pipeline));
GST_LOCK (pipeline);
GST_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
gst_object_replace ((GstObject **) & pipeline->fixed_clock, NULL);
GST_UNLOCK (pipeline);
GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
}