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av_get_audio_frame_duration: fix FPE 

Fixes ticket1392

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-06-03 17:12:26 +02:00
parent 6df1cfa7e4
commit a5ad3c2382
1 changed files with 4 additions and 0 deletions
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4
libavcodec/utils.c
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@ -2199,8 +2199,12 @@ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
/* calc from frame_bytes, channels, and bits_per_coded_sample */
switch (avctx->codec_id) {
case CODEC_ID_PCM_DVD:
if(bps<4)
return 0;
return 2 * (frame_bytes / ((bps * 2 / 8) * ch));
case CODEC_ID_PCM_BLURAY:
if(bps<4)
return 0;
return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);
case CODEC_ID_S302M:
return 2 * (frame_bytes / ((bps + 4) / 4)) / ch;