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decklinkvideosink: Consider pipeline latency, render delay and ts offset when scheduling frames

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Without this, we will schedule all frames too late in live pipelines.

https://bugzilla.gnome.org/show_bug.cgi?id=754666
This commit is contained in:
Sebastian Dröge 2015-09-07 13:36:19 +03:00
parent 21bfa428d1
commit a6744a915b
1 changed files with 23 additions and 0 deletions
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23
sys/decklink/gstdecklinkvideosink.cpp
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@ -416,6 +416,7 @@ gst_decklink_video_sink_prepare (GstBaseSink * bsink, GstBuffer * buffer)
HRESULT ret;
GstClockTime timestamp, duration;
GstClockTime running_time, running_time_duration;
GstClockTime latency, render_delay, ts_offset;
gint i;
GST_DEBUG_OBJECT (self, "Preparing buffer %p", buffer);
@ -439,6 +440,28 @@ gst_decklink_video_sink_prepare (GstBaseSink * bsink, GstBuffer * buffer)
gst_segment_to_running_time (&GST_BASE_SINK_CAST (self)->segment,
GST_FORMAT_TIME, timestamp + duration) - running_time;
/* See gst_base_sink_adjust_time() */
latency = gst_base_sink_get_latency (bsink);
render_delay = gst_base_sink_get_render_delay (bsink);
ts_offset = gst_base_sink_get_ts_offset (bsink);
running_time += latency;
if (ts_offset < 0) {
ts_offset = -ts_offset;
if (ts_offset < running_time)
running_time -= ts_offset;
else
running_time = 0;
} else {
running_time += ts_offset;
}
if (running_time > render_delay)
running_time -= render_delay;
else
running_time = 0;
ret = self->output->output->CreateVideoFrame (self->info.width,
self->info.height, self->info.stride[0], bmdFormat8BitYUV,
bmdFrameFlagDefault, &frame);