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avformat/matroskadec: fix DiscardPadding element parsing

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If the value is negative then it means padding at the start of the packet
instead of at the end.

Based on a patch by Hendrik Leppkes.

Reviewed-by: James Zern <jzern-at-google.com@ffmpeg.org>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2016-11-05 17:46:52 -03:00
parent 317be31eaf
commit 70c6a1bcf0
1 changed files with 7 additions and 3 deletions
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10
libavformat/matroskadec.c
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@ -3082,10 +3082,14 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
av_free(pkt);
return AVERROR(ENOMEM);
}
AV_WL32(side_data, 0);
AV_WL32(side_data + 4, av_rescale_q(discard_padding,
discard_padding = av_rescale_q(discard_padding,
(AVRational){1, 1000000000},
(AVRational){1, st->codecpar->sample_rate}));
(AVRational){1, st->codecpar->sample_rate});
if (discard_padding > 0) {
AV_WL32(side_data + 4, discard_padding);
} else {
AV_WL32(side_data, -discard_padding);
}
}
if (track->ms_compat)