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pipeline: use START_TIME to keep track of time

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Use the element START_TIME to keep track of the running time when the pipeline
paused so that it can be used to restore the base_time.
Take the start_time before setting the children to PAUSED so that we can
distribute the start_time to the children.
This commit is contained in:
Wim Taymans 2009-05-28 16:30:52 +02:00 committed by Wim Taymans
parent 465b40a2b8
commit 6affcdd2ad
2 changed files with 55 additions and 56 deletions
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108
gst/gstpipeline.c
View file

@ -120,7 +120,7 @@ struct _GstPipelinePrivate
/* when we need to update stream_time or clock when going back to
* PLAYING*/
gboolean update_stream_time;
GstClockTime last_start_time;
gboolean update_clock;
};
@ -292,15 +292,16 @@ gst_pipeline_get_property (GObject * object, guint prop_id,
}
}
/* set the running time to 0 */
/* set the start_time to 0, this will cause us to select a new base_time and
* make the running_time start from 0 again. */
static void
reset_running_time (GstPipeline * pipeline)
reset_start_time (GstPipeline * pipeline)
{
GST_OBJECT_LOCK (pipeline);
if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
GST_DEBUG_OBJECT (pipeline, "reset stream_time to 0");
pipeline->stream_time = 0;
pipeline->priv->update_stream_time = TRUE;
if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) {
GST_DEBUG_OBJECT (pipeline, "reset start_time to 0");
GST_ELEMENT_START_TIME (pipeline) = 0;
pipeline->priv->last_start_time = -1;
} else {
GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time");
}
@ -346,8 +347,8 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
{
GstClockTime new_base_time;
GstClockTime start_time, stream_time, delay;
gboolean new_clock, update_stream_time, update_clock;
GstClockTime now, start_time, last_start_time, delay;
gboolean update_clock;
GstClock *cur_clock;
GST_DEBUG_OBJECT (element, "selecting clock and base_time");
@ -356,18 +357,20 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
cur_clock = element->clock;
if (cur_clock)
gst_object_ref (cur_clock);
stream_time = pipeline->stream_time;
update_stream_time = pipeline->priv->update_stream_time;
/* get the desired running_time of the first buffer aka the start_time */
start_time = GST_ELEMENT_START_TIME (pipeline);
last_start_time = pipeline->priv->last_start_time;
pipeline->priv->last_start_time = start_time;
/* see if we need to update the clock */
update_clock = pipeline->priv->update_clock;
pipeline->priv->update_stream_time = FALSE;
pipeline->priv->update_clock = FALSE;
delay = pipeline->delay;
GST_OBJECT_UNLOCK (element);
/* running time changed, either with a PAUSED or a flush, we need to check
* if there is a new clock & update the base time */
if (update_stream_time) {
GST_DEBUG_OBJECT (pipeline, "Need to update stream_time");
if (last_start_time != start_time) {
GST_DEBUG_OBJECT (pipeline, "Need to update start_time");
/* when going to PLAYING, select a clock when needed. If we just got
* flushed, we don't reselect the clock. */
@ -380,16 +383,14 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
clock = gst_object_ref (cur_clock);
}
new_clock = (clock != cur_clock);
if (clock) {
start_time = gst_clock_get_time (clock);
now = gst_clock_get_time (clock);
} else {
GST_DEBUG ("no clock, using base time of NONE");
start_time = GST_CLOCK_TIME_NONE;
now = GST_CLOCK_TIME_NONE;
}
if (new_clock) {
if (clock != cur_clock) {
/* now distribute the clock (which could be NULL). If some
* element refuses the clock, this will return FALSE and
* we effectively fail the state change. */
@ -405,13 +406,12 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
if (clock)
gst_object_unref (clock);
if (stream_time != GST_CLOCK_TIME_NONE
&& start_time != GST_CLOCK_TIME_NONE) {
new_base_time = start_time - stream_time + delay;
if (start_time != GST_CLOCK_TIME_NONE && now != GST_CLOCK_TIME_NONE) {
new_base_time = now - start_time + delay;
GST_DEBUG_OBJECT (element,
"stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
"start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
", base_time %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream_time), GST_TIME_ARGS (start_time),
GST_TIME_ARGS (start_time), GST_TIME_ARGS (now),
GST_TIME_ARGS (new_base_time));
} else
new_base_time = GST_CLOCK_TIME_NONE;
@ -420,7 +420,7 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
gst_element_set_base_time (element, new_base_time);
else
GST_DEBUG_OBJECT (pipeline,
"NOT adjusting base_time because stream_time is NONE");
"NOT adjusting base_time because start_time is NONE");
} else {
GST_DEBUG_OBJECT (pipeline,
"NOT adjusting base_time because we selected one before");
@ -430,25 +430,6 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
gst_object_unref (cur_clock);
break;
}
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
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:
{
reset_running_time (pipeline);
break;
}
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_OBJECT_LOCK (element);
if ((clock = element->clock)) {
@ -463,22 +444,40 @@ gst_pipeline_change_state (GstElement * element, GstStateChange transition)
GST_OBJECT_LOCK (element);
/* store the current running time */
if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
pipeline->stream_time = now - element->base_time;
if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) {
GST_ELEMENT_START_TIME (pipeline) = now - element->base_time;
/* we went to PAUSED, when going to PLAYING select clock and new
* base_time */
pipeline->priv->update_stream_time = TRUE;
pipeline->priv->update_clock = TRUE;
}
GST_DEBUG_OBJECT (element,
"stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
"start_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_TIME_ARGS (GST_ELEMENT_START_TIME (pipeline)),
GST_TIME_ARGS (now), GST_TIME_ARGS (element->base_time));
}
GST_OBJECT_UNLOCK (element);
break;
break;
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:
{
reset_start_time (pipeline);
break;
}
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
@ -543,7 +542,7 @@ gst_pipeline_handle_message (GstBin * bin, GstMessage * message)
/* reset our running time if we need to distribute a new base_time to the
* children. */
if (new_base_time)
reset_running_time (pipeline);
reset_start_time (pipeline);
break;
}
@ -596,8 +595,7 @@ gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
g_return_if_fail (GST_IS_PIPELINE (pipeline));
GST_OBJECT_LOCK (pipeline);
pipeline->stream_time = time;
pipeline->priv->update_stream_time = TRUE;
GST_ELEMENT_START_TIME (pipeline) = time;
GST_OBJECT_UNLOCK (pipeline);
GST_DEBUG_OBJECT (pipeline, "set new stream_time to %" GST_TIME_FORMAT,
@ -635,7 +633,7 @@ gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
GST_OBJECT_LOCK (pipeline);
result = pipeline->stream_time;
result = GST_ELEMENT_START_TIME (pipeline);
GST_OBJECT_UNLOCK (pipeline);
return result;

3
gst/gstpipeline.h
View file

@ -59,7 +59,8 @@ typedef enum {
* GST_PIPELINE_FLAG_FIXED_CLOCK is set.
* @stream_time: The stream time of the pipeline. A better name for this
* property would be the running_time, the total time spent in the
* PLAYING state without being flushed.
* PLAYING state without being flushed. (deprecated, use the start_time
* on GstElement).
* @delay: Extra delay added to base_time to compensate for computing delays
* when setting elements to PLAYING.
*