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decoder: mpeg2: respect any input PTS provided for a frame.

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The timestamp generator in gstvaapidecoder_mpeg2.c always interpolated
frame timestamps within a GOP, even when it's been fed input PTS for
every frame.

That leads to incorrect output timestamps in some situations - for example
live playback where input timestamps have been scaled based on arrival time
from the network and don't exactly match the framerate.

https://bugzilla.gnome.org/show_bug.cgi?id=732719
This commit is contained in:
Jan Schmidt 2014-07-04 15:13:32 +10:00 committed by Gwenole Beauchesne
parent 99bf1b1f98
commit 22dc8c4251
1 changed files with 4 additions and 1 deletions
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3
gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c
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@ -130,6 +130,8 @@ pts_eval(PTSGenerator *tsg, GstClockTime pic_pts, guint pic_tsn)
if (!GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
tsg->gop_pts = 0;
pts = pic_pts;
if (!GST_CLOCK_TIME_IS_VALID (pts))
pts = tsg->gop_pts + pts_get_duration(tsg, tsg->ovl_tsn * 1024 + pic_tsn);
if (!GST_CLOCK_TIME_IS_VALID(tsg->max_pts) || tsg->max_pts < pts)
@ -142,6 +144,7 @@ pts_eval(PTSGenerator *tsg, GstClockTime pic_pts, guint pic_tsn)
tsg->ovl_tsn++;
}
tsg->lst_tsn = pic_tsn;
return pts;
}