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dv: fix null ptr dereference

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Fixes Ticket1640

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-08-16 04:25:07 +02:00
parent f0896a6bd9
commit a39c5c4c6b
1 changed files with 5 additions and 1 deletions
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6
libavformat/dv.c
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@ -419,9 +419,13 @@ static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
{
c->frames= frame_offset;
if (c->ach)
if (c->ach) {
if (c->sys) {
c->abytes= av_rescale_q(c->frames, c->sys->time_base,
(AVRational){8, c->ast[0]->codec->bit_rate});
}else
av_log(c->fctx, AV_LOG_ERROR, "cannot adjust audio bytes\n");
}
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
}