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Fix an underflow/overflow that was causing some crackles when playing

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certain THP files.
patch by Marco Gerards, mgerards xs4all nl

Originally committed as revision 8703 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Marco Gerards 2007-04-10 08:18:04 +00:00 committed by Diego Biurrun
parent 44942d52b6
commit e457023a95
1 changed files with 3 additions and 1 deletions
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4
libavcodec/adpcm.c
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@ -1359,8 +1359,10 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
if(n&1) sampledat= *src++ <<28;
else sampledat= (*src&0xF0)<<24;
*samples = ((prev[ch][0]*factor1
sampledat = ((prev[ch][0]*factor1
+ prev[ch][1]*factor2) >> 11) + (sampledat>>exp);
CLAMP_TO_SHORT(sampledat);
*samples = sampledat;
prev[ch][1] = prev[ch][0];
prev[ch][0] = *samples++;