gstreamer/gst/gstpipeline.c
Wim Taymans 5c026ec0db gst/gstpipeline.c: Take snapshot of state without blocking.
Original commit message from CVS:
* gst/gstpipeline.c: (gst_pipeline_send_event):
Take snapshot of state without blocking.
2005-06-02 09:39:21 +00:00

618 lines
17 KiB
C

/* 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.
*/
#include "gst_private.h"
#include "gstpipeline.h"
#include "gstinfo.h"
#include "gstscheduler.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
#define DEFAULT_PLAY_TIMEOUT (2*GST_SECOND)
enum
{
ARG_0,
ARG_DELAY,
ARG_PLAY_TIMEOUT,
/* 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 GstBusSyncReply pipeline_bus_handler (GstBus * bus, GstMessage * message,
GstPipeline * pipeline);
static GstClock *gst_pipeline_get_clock_func (GstElement * element);
static GstElementStateReturn gst_pipeline_change_state (GstElement * element);
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), ARG_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));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PLAY_TIMEOUT,
g_param_spec_uint64 ("play-timeout", "Play Timeout",
"Max timeout for going " "to PLAYING in nanoseconds", 0, G_MAXUINT64,
DEFAULT_PLAY_TIMEOUT, 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->get_clock = GST_DEBUG_FUNCPTR (gst_pipeline_get_clock_func);
}
static void
gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
{
GstScheduler *scheduler;
GstPipeline *pipeline = GST_PIPELINE (instance);
GstBus *bus;
/* get an instance of the default scheduler */
scheduler = gst_scheduler_factory_make (NULL, GST_ELEMENT (pipeline));
/* FIXME need better error handling */
if (scheduler == NULL) {
const gchar *name = gst_scheduler_factory_get_default_name ();
g_error ("Critical error: could not get scheduler \"%s\"\n"
"Are you sure you have a registry ?\n"
"Run gst-register as root if you haven't done so yet.", name);
}
bus = g_object_new (gst_bus_get_type (), NULL);
gst_bus_set_sync_handler (bus,
(GstBusSyncHandler) pipeline_bus_handler, pipeline);
pipeline->eosed = NULL;
pipeline->delay = DEFAULT_DELAY;
pipeline->play_timeout = DEFAULT_PLAY_TIMEOUT;
/* we are our own manager */
GST_ELEMENT_MANAGER (pipeline) = pipeline;
gst_element_set_bus (GST_ELEMENT (pipeline), bus);
/* set_bus refs the bus via gst_object_replace, we drop our ref */
gst_object_unref ((GstObject *) bus);
gst_element_set_scheduler (GST_ELEMENT (pipeline), scheduler);
}
static void
gst_pipeline_dispose (GObject * object)
{
GstPipeline *pipeline = GST_PIPELINE (object);
gst_element_set_bus (GST_ELEMENT (pipeline), NULL);
gst_scheduler_reset (GST_ELEMENT_SCHEDULER (object));
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 ARG_DELAY:
pipeline->delay = g_value_get_uint64 (value);
break;
case ARG_PLAY_TIMEOUT:
pipeline->play_timeout = 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 ARG_DELAY:
g_value_set_uint64 (value, pipeline->delay);
break;
case ARG_PLAY_TIMEOUT:
g_value_set_uint64 (value, pipeline->play_timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_UNLOCK (pipeline);
}
static gboolean
is_eos (GstPipeline * pipeline)
{
GstIterator *sinks;
gboolean result = TRUE;
gboolean done = FALSE;
sinks = gst_bin_iterate_sinks (GST_BIN (pipeline));
while (!done) {
gpointer data;
switch (gst_iterator_next (sinks, &data)) {
case GST_ITERATOR_OK:
{
GstElement *element = GST_ELEMENT (data);
GList *eosed;
GstElementState state, pending;
GstElementStateReturn complete;
gchar *name;
complete = gst_element_get_state (element, &state, &pending, NULL);
name = gst_element_get_name (element);
if (complete == GST_STATE_ASYNC) {
GST_DEBUG ("element %s still performing state change", name);
result = FALSE;
done = TRUE;
goto done;
} else if (state != GST_STATE_PLAYING) {
GST_DEBUG ("element %s not playing %d %d", name, state, pending);
goto done;
}
eosed = g_list_find (pipeline->eosed, element);
if (!eosed) {
result = FALSE;
done = TRUE;
}
done:
g_free (name);
gst_object_unref (GST_OBJECT (element));
break;
}
case GST_ITERATOR_RESYNC:
result = TRUE;
gst_iterator_resync (sinks);
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
default:
g_assert_not_reached ();
break;
}
}
gst_iterator_free (sinks);
return result;
}
/* sending an event on the pipeline pauses the pipeline if it
* was playing.
*/
static gboolean
gst_pipeline_send_event (GstElement * element, GstEvent * event)
{
gboolean was_playing;
gboolean res;
GstElementState state;
GstEventType event_type = GST_EVENT_TYPE (event);
GTimeVal timeout;
/* need to call _get_state() since a bin state is only updated
* with this call. */
GST_TIME_TO_TIMEVAL (0, timeout);
gst_element_get_state (element, &state, NULL, &timeout);
was_playing = state == GST_STATE_PLAYING;
if (was_playing && event_type == GST_EVENT_SEEK)
gst_element_set_state (element, GST_STATE_PAUSED);
res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
if (was_playing && event_type == GST_EVENT_SEEK)
gst_element_set_state (element, GST_STATE_PLAYING);
return res;
}
/* FIXME, make me threadsafe */
static GstBusSyncReply
pipeline_bus_handler (GstBus * bus, GstMessage * message,
GstPipeline * pipeline)
{
GstBusSyncReply result = GST_BUS_PASS;
gboolean posteos = FALSE;
/* we don't want messages from the streaming thread while we're doing the
* state change. We do want them from the state change functions. */
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_EOS:
if (GST_MESSAGE_SRC (message) != GST_OBJECT (pipeline)) {
GST_DEBUG ("got EOS message");
GST_LOCK (bus);
pipeline->eosed =
g_list_prepend (pipeline->eosed, GST_MESSAGE_SRC (message));
GST_UNLOCK (bus);
if (is_eos (pipeline)) {
posteos = TRUE;
}
/* we drop all EOS messages */
result = GST_BUS_DROP;
gst_message_unref (message);
}
break;
case GST_MESSAGE_ERROR:
break;
default:
break;
}
if (posteos) {
gst_bus_post (bus, gst_message_new_eos (GST_OBJECT (pipeline)));
}
return result;
}
/**
* 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 GstElementStateReturn
gst_pipeline_change_state (GstElement * element)
{
GstElementStateReturn result = GST_STATE_SUCCESS;
GstPipeline *pipeline = GST_PIPELINE (element);
gint transition = GST_STATE_TRANSITION (element);
switch (transition) {
case GST_STATE_NULL_TO_READY:
if (element->bus)
gst_bus_set_flushing (element->bus, FALSE);
gst_scheduler_setup (GST_ELEMENT_SCHEDULER (pipeline));
break;
case GST_STATE_READY_TO_PAUSED:
{
GstClock *clock;
clock = gst_element_get_clock (element);
gst_element_set_clock (element, clock);
pipeline->eosed = NULL;
break;
}
case GST_STATE_PAUSED_TO_PLAYING:
if (element->clock) {
GstClockTime start_time = gst_clock_get_time (element->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));
} else {
element->base_time = 0;
GST_DEBUG ("no clock, using base time of 0");
}
break;
case GST_STATE_PLAYING_TO_PAUSED:
case GST_STATE_PAUSED_TO_READY:
case GST_STATE_READY_TO_NULL:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element);
switch (transition) {
case GST_STATE_READY_TO_PAUSED:
pipeline->stream_time = 0;
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
if (element->clock) {
GstClockTime now;
now = gst_clock_get_time (element->clock);
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));
}
break;
case GST_STATE_PAUSED_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
if (element->bus) {
gst_bus_set_flushing (element->bus, TRUE);
}
break;
}
/* we wait for async state changes ourselves.
* FIXME this can block forever, better do this in a worker
* thread or use a timeout? */
if (result == GST_STATE_ASYNC) {
GTimeVal *timeval, timeout;
GST_STATE_UNLOCK (pipeline);
GST_LOCK (pipeline);
if (pipeline->play_timeout > 0) {
GST_TIME_TO_TIMEVAL (pipeline->play_timeout, timeout);
timeval = &timeout;
} else {
timeval = NULL;
}
GST_UNLOCK (pipeline);
result = gst_element_get_state (element, NULL, NULL, timeval);
GST_STATE_LOCK (pipeline);
}
return result;
}
/**
* gst_pipeline_get_scheduler:
* @pipeline: the pipeline
*
* Gets the #GstScheduler of this pipeline.
*
* Returns: a GstScheduler.
*
* MT safe.
*/
GstScheduler *
gst_pipeline_get_scheduler (GstPipeline * pipeline)
{
return gst_element_get_scheduler (GST_ELEMENT (pipeline));
}
/**
* 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));
}
static GstClock *
gst_pipeline_get_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 (GST_OBJECT (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)->get_clock (GST_ELEMENT (pipeline));
/* no clock, use a system clock */
if (!clock) {
clock = gst_system_clock_obtain ();
/* we unref since this function is not supposed to increase refcount
* of clock object returned; this is ok since the systemclock always
* has a refcount of at least one in the current code. */
gst_object_unref (GST_OBJECT (clock));
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_get_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");
}