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Fix 4 and 8 bit RGB/BGR input. 

Originally committed as revision 27521 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Michael Niedermayer 2008-09-04 20:46:36 +00:00
parent f2eb8c5bf6
commit 1462302027
1 changed files with 34 additions and 9 deletions
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43
libswscale/swscale.c
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@ -2507,6 +2507,12 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
int i;
uint8_t* src2[4]= {src[0], src[1], src[2]};
uint32_t pal[256];
int use_pal= c->srcFormat == PIX_FMT_PAL8
|| c->srcFormat == PIX_FMT_BGR4_BYTE
|| c->srcFormat == PIX_FMT_RGB4_BYTE
|| c->srcFormat == PIX_FMT_BGR8
|| c->srcFormat == PIX_FMT_RGB8;
if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
return 0;
@ -2515,15 +2521,34 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
}
if (c->srcFormat == PIX_FMT_PAL8){
if (use_pal){
for (i=0; i<256; i++){
int p= ((uint32_t*)(src[1]))[i];
int r= (p>>16)&0xFF;
int g= (p>> 8)&0xFF;
int b= p &0xFF;
int y= av_clip_uint8(((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16 );
int u= av_clip_uint8(((RU*r + GU*g + BU*b)>>RGB2YUV_SHIFT) + 128);
int v= av_clip_uint8(((RV*r + GV*g + BV*b)>>RGB2YUV_SHIFT) + 128);
int p, r, g, b,y,u,v;
if(c->srcFormat == PIX_FMT_PAL8){
p=((uint32_t*)(src[1]))[i];
r= (p>>16)&0xFF;
g= (p>> 8)&0xFF;
b= p &0xFF;
}else if(c->srcFormat == PIX_FMT_RGB8){
r= (i>>5 )*36;
g= ((i>>2)&7)*36;
b= (i&3 )*85;
}else if(c->srcFormat == PIX_FMT_BGR8){
b= (i>>6 )*85;
g= ((i>>3)&7)*36;
r= (i&7 )*36;
}else if(c->srcFormat == PIX_FMT_RGB4_BYTE){
r= (i>>3 )*255;
g= ((i>>1)&3)*85;
b= (i&1 )*255;
}else if(c->srcFormat == PIX_FMT_BGR4_BYTE){
b= (i>>3 )*255;
g= ((i>>1)&3)*85;
r= (i&1 )*255;
}
y= av_clip_uint8(((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16 );
u= av_clip_uint8(((RU*r + GU*g + BU*b)>>RGB2YUV_SHIFT) + 128);
v= av_clip_uint8(((RV*r + GV*g + BV*b)>>RGB2YUV_SHIFT) + 128);
pal[i]= y + (u<<8) + (v<<16);
}
src2[1]= (uint8_t*)pal;
@ -2544,7 +2569,7 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
int dstStride2[4]= {-dstStride[0], -dstStride[1], -dstStride[2]};
src2[0] += (srcSliceH-1)*srcStride[0];
if (c->srcFormat != PIX_FMT_PAL8)
if (!use_pal)
src2[1] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[1];
src2[2] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[2];