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videorate: Fix buffer timestamp underflow in reverse playback

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And fix reverse playback buffer duration computation as in reverse
playback, buffer duration is prev_buffer.pts - buffer.pts not pts -
next_pts (buffers are displayed from buffer.pts + buffer.duration for
a duration of buffers.duration).

This is now tested with the `validate.test.clock_sync.videorate.*`
tests in the default integration testsuite where we check the exact
data flow and the synchronization on the clock behaviour with a
TestClock.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/646>
This commit is contained in:
Thibault Saunier 2020-04-27 09:57:30 -04:00 committed by GStreamer Merge Bot
parent 9ce93abb29
commit fc2810bada
1 changed files with 10 additions and 2 deletions
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12
gst/videorate/gstvideorate.c
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@ -673,14 +673,22 @@ gst_video_rate_push_buffer (GstVideoRate * videorate, GstBuffer * outbuf,
if (videorate->segment.rate < 0.0) {
if (videorate->to_rate_numerator) {
/* interpolate next expected timestamp in the segment */
videorate->next_ts =
GstClockTimeDiff next_ts =
videorate->segment.base + videorate->segment.stop -
videorate->base_ts -
gst_util_uint64_scale (videorate->out_frame_count + 1,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
GST_BUFFER_DURATION (outbuf) = push_ts - videorate->next_ts;
videorate->next_ts = next_ts < 0 ? GST_CLOCK_TIME_NONE : next_ts;
GST_BUFFER_DURATION (outbuf) =
gst_util_uint64_scale (videorate->out_frame_count,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator) -
gst_util_uint64_scale (videorate->out_frame_count - 1,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
} else if (next_intime != GST_CLOCK_TIME_NONE) {
videorate->next_ts = next_intime;
} else {