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basesink: Only drop buffer if their PTS is out of segment

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As of now, even for stream completly inside segment, there is no
guarantied that the DTS will be inside the segment. Specifically
for H.264 with B-Frames, the first few frames often have DTS that
are before the segment.

Instead of using the sync timestamp to clip out of segment buffer,
take the duration from the start/stop provided by the sub-class, and
check if the pts and pts_end is out of segment.

https://bugzilla.gnome.org/show_bug.cgi?id=752791
This commit is contained in:
Nicolas Dufresne 2015-08-05 15:51:27 -04:00
parent 60de1f26c7
commit e24e902d2f
1 changed files with 13 additions and 2 deletions
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15
libs/gst/base/gstbasesink.c
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@ -3400,10 +3400,21 @@ gst_base_sink_chain_unlocked (GstBaseSink * basesink, GstPad * pad,
GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (end));
/* a dropped buffer does not participate in anything */
/* a dropped buffer does not participate in anything. Buffer can only be
* dropped if their PTS falls completly outside the segment, while we sync
* preferably on DTS */
if (GST_CLOCK_TIME_IS_VALID (start) && (segment->format == GST_FORMAT_TIME)) {
GstClockTime pts = GST_BUFFER_PTS (sync_buf);
GstClockTime pts_end = GST_CLOCK_TIME_NONE;
if (!GST_CLOCK_TIME_IS_VALID (pts))
pts = start;
if (GST_CLOCK_TIME_IS_VALID (end))
pts_end = pts + (end - start);
if (G_UNLIKELY (!gst_segment_clip (segment,
GST_FORMAT_TIME, start, end, NULL, NULL)))
GST_FORMAT_TIME, pts, pts_end, NULL, NULL)))
goto out_of_segment;
}