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normalize adaptive quantizatiuon fix (based upon a patch by (Jindrich Makovicka <makovick at kmlinux dot fjfi dot cvut dot cz>))

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Originally committed as revision 2780 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-14 13:37:58 +00:00
parent fafbc7c8c8
commit e9a4834a7d
1 changed files with 4 additions and 1 deletions
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5
libavcodec/ratecontrol.c
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@ -545,9 +545,10 @@ static void adaptive_quantization(MpegEncContext *s, double q){
/* handle qmin/qmax cliping */ /* handle qmin/qmax cliping */
if(s->flags&CODEC_FLAG_NORMALIZE_AQP){ if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
float factor= bits_sum/cplx_sum;
for(i=0; i<s->mb_num; i++){ for(i=0; i<s->mb_num; i++){
float newq= q*cplx_tab[i]/bits_tab[i]; float newq= q*cplx_tab[i]/bits_tab[i];
newq*= bits_sum/cplx_sum; newq*= factor;
if (newq > qmax){ if (newq > qmax){
bits_sum -= bits_tab[i]; bits_sum -= bits_tab[i];
@ -558,6 +559,8 @@ static void adaptive_quantization(MpegEncContext *s, double q){
cplx_sum -= cplx_tab[i]*q/qmin; cplx_sum -= cplx_tab[i]*q/qmin;
} }
} }
if(bits_sum < 0.001) bits_sum= 0.001;
if(cplx_sum < 0.001) cplx_sum= 0.001;
} }
for(i=0; i<s->mb_num; i++){ for(i=0; i<s->mb_num; i++){