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decklink: fixup internal time tracking over buffering pauses

Browse source 
Instead of relying on buffers after a state change to PLAYING to always start
from 0, track the amount of time we have spent outside playing but not changed
state to PAUSED.
This commit is contained in:
Matthew Waters 2018-11-21 08:43:56 -06:00
parent 65c9c4b406
commit d67d866eb9
2 changed files with 16 additions and 12 deletions
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25
sys/decklink/gstdecklinkvideosink.cpp
View file

@ -640,20 +640,21 @@ gst_decklink_video_sink_convert_to_internal_clock (GstDecklinkVideoSink * self,
GST_TIME_FORMAT, GST_TIME_ARGS (*timestamp));
}
if (GST_CLOCK_TIME_IS_VALID (self->paused_start_time)) {
if (GST_CLOCK_TIME_IS_VALID (self->paused_start_time) &&
GST_CLOCK_TIME_IS_VALID (self->playing_base_time)) {
/* add the time since we were last playing. */
*timestamp += self->paused_start_time + self->playing_base_time;
} else {
/* only valid whil we're in PAUSED and most likely without a set clock,
* we update based on our internal clock */
*timestamp += gst_clock_get_internal_time (self->output->clock);
} else {
/* add the time since we were last playing. */
*timestamp += self->playing_start_time;
}
GST_LOG_OBJECT (self, "Output timestamp %" GST_TIME_FORMAT
" using paused start at %" GST_TIME_FORMAT " playing start at %"
GST_TIME_FORMAT, GST_TIME_ARGS (*timestamp),
GST_TIME_ARGS (self->paused_start_time),
GST_TIME_ARGS (self->playing_start_time));
GST_TIME_ARGS (self->playing_base_time));
}
static GstFlowReturn
@ -1211,6 +1212,9 @@ gst_decklink_video_sink_change_state (GstElement * element,
GST_STATE_CHANGE_FAILURE)
ret = GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
self->playing_exit_time = gst_clock_get_internal_time (self->output->clock);
break;
default:
break;
}
@ -1259,12 +1263,11 @@ gst_decklink_video_sink_state_changed (GstElement * element,
GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (element);
if (new_state == GST_STATE_PLAYING) {
self->paused_start_time = GST_CLOCK_TIME_NONE;
self->playing_start_time =
gst_clock_get_internal_time (self->output->clock);
GST_DEBUG_OBJECT (self,
"playing entered, new playing start time %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->playing_start_time));
self->playing_base_time = gst_clock_get_internal_time (self->output->clock) - self->playing_exit_time;
GST_DEBUG_OBJECT (self, "playing entered paused start time %"
GST_TIME_FORMAT "playing base time %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->paused_start_time),
GST_TIME_ARGS (self->playing_base_time));
}
if (new_state == GST_STATE_PAUSED) {

3
sys/decklink/gstdecklinkvideosink.h
View file

@ -63,9 +63,10 @@ struct _GstDecklinkVideoSink
/* all in internal time of the decklink clock */
/* really an internal base time */
GstClockTime playing_start_time; /* time that we entered playing */
GstClockTime playing_base_time; /* time that we entered playing */
/* really an internal start time */
GstClockTime paused_start_time; /* time we entered paused, used to track how long we are in paused while the clock is running */
GstClockTime playing_exit_time; /* time that we exit playing */
GstDecklinkOutput *output;