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fix qmin==qmax==1 && msmpeg4 && intra bug

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Originally committed as revision 2051 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-07-16 11:48:59 +00:00
parent afdd82bbf0
commit fa12b5469d
1 changed files with 6 additions and 3 deletions
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9
libavcodec/ratecontrol.c
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@ -359,6 +359,8 @@ static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pic
int qmin= s->avctx->qmin; int qmin= s->avctx->qmin;
int qmax= s->avctx->qmax; int qmax= s->avctx->qmax;
assert(qmin <= qmax);
if(pict_type==B_TYPE){ if(pict_type==B_TYPE){
qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5); qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5); qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
@ -367,13 +369,14 @@ static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pic
qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5); qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
} }
if(qmin<1) qmin=1; qmin= clip(qmin, 1, 31);
qmax= clip(qmax, 1, 31);
if(qmin==1 && s->avctx->qmin>1) qmin=2; //avoid qmin=1 unless the user wants qmin=1 if(qmin==1 && s->avctx->qmin>1) qmin=2; //avoid qmin=1 unless the user wants qmin=1
if(qmin<3 && s->max_qcoeff<=128 && pict_type==I_TYPE) qmin=3; //reduce cliping problems if(qmin<3 && s->max_qcoeff<=128 && pict_type==I_TYPE) qmin=3; //reduce cliping problems
if(qmax>31) qmax=31; if(qmax<qmin) qmax= qmin;
if(qmax<=qmin) qmax= qmin= (qmax+qmin+1)>>1;
*qmin_ret= qmin; *qmin_ret= qmin;
*qmax_ret= qmax; *qmax_ret= qmax;