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improve horizontal chroma resolution with pal 

Originally committed as revision 22994 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Michael Niedermayer 2007-04-15 01:27:34 +00:00
parent 21c08a3f1c
commit fa65e2f63a
2 changed files with 7 additions and 6 deletions
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5
libswscale/swscale.c
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@ -2036,7 +2036,10 @@ SwsContext *sws_getContext(int srcW, int srcH, int srcFormat, int dstW, int dstH
c->chrSrcVSubSample+= c->vChrDrop;
// drop every 2. pixel for chroma calculation unless user wants full chroma
if((isBGR(srcFormat) || isRGB(srcFormat)) && !(flags&SWS_FULL_CHR_H_INP))
if((isBGR(srcFormat) || isRGB(srcFormat)) && !(flags&SWS_FULL_CHR_H_INP)
&& srcFormat!=PIX_FMT_RGB8 && srcFormat!=PIX_FMT_BGR8
&& srcFormat!=PIX_FMT_RGB4 && srcFormat!=PIX_FMT_BGR4
&& srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE)
c->chrSrcHSubSample=1;
if(param){

8
libswscale/swscale_template.c
View File

@ -2296,12 +2296,10 @@ static inline void RENAME(palToUV)(uint8_t *dstU, uint8_t *dstV, uint8_t *src1,
assert(src1 == src2);
for(i=0; i<width; i++)
{
int d0= src1[2*i ];
int d1= src1[2*i+1];
int p = (pal[d0]&0xFF00FF) + (pal[d1]&0xFF00FF);
int p= pal[src1[i]];
dstU[i]= (pal[d0]+pal[d1]-p)>>9;
dstV[i]= p>>17;
dstU[i]= p>>8;
dstV[i]= p>>16;
}
}