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warn the user if we had to clip some dct coefficient due to a crappy format which doenst support the whole needed range (msmpeg4/wmv mostly but mpeg1 too to a lesser extend)

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Originally committed as revision 2661 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-01-04 14:43:52 +00:00
parent baaf3f467b
commit 5ac59c559b
1 changed files with 12 additions and 3 deletions
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15
libavcodec/mpegvideo.c
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@ -3140,6 +3140,7 @@ static inline void clip_coeffs(MpegEncContext *s, DCTELEM *block, int last_index
int i; int i;
const int maxlevel= s->max_qcoeff; const int maxlevel= s->max_qcoeff;
const int minlevel= s->min_qcoeff; const int minlevel= s->min_qcoeff;
int overflow=0;
if(s->mb_intra){ if(s->mb_intra){
i=1; //skip clipping of intra dc i=1; //skip clipping of intra dc
@ -3150,11 +3151,19 @@ static inline void clip_coeffs(MpegEncContext *s, DCTELEM *block, int last_index
const int j= s->intra_scantable.permutated[i]; const int j= s->intra_scantable.permutated[i];
int level = block[j]; int level = block[j];
if (level>maxlevel) level=maxlevel; if (level>maxlevel){
else if(level<minlevel) level=minlevel; level=maxlevel;
overflow++;
}else if(level<minlevel){
level=minlevel;
overflow++;
}
block[j]= level; block[j]= level;
} }
if(overflow && s->avctx->mb_decision == FF_MB_DECISION_SIMPLE)
av_log(s->avctx, AV_LOG_INFO, "warning, cliping %d dct coefficents to %d..%d\n", overflow, minlevel, maxlevel);
} }
#if 0 #if 0