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.
Signed-off-by: James Almer <jamr...@gmail.com>
---
libavformat/matroskadec.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 32f5e49..5a22193 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3082,10 +3082,16 @@ 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, 0);
+ AV_WL32(side_data + 4, discard_padding);
+ } else {
+ AV_WL32(side_data, -discard_padding);
+ AV_WL32(side_data + 4, 0);
+ }
}
if (track->ms_compat)
--
2.10.1
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