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Code Issues Releases Activity

fix asymmetric CQMs with pre-transposed DCT.

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Originally committed as revision 4799 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2005-12-31 14:14:38 +00:00
parent f23af3d825
commit ab2e3e2c80
1 changed files with 3 additions and 1 deletions
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4
libavcodec/h264.c
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@ -2973,6 +2973,7 @@ static void init_dequant8_coeff_table(H264Context *h){
static void init_dequant4_coeff_table(H264Context *h){
int i,j,q,x;
const int transpose = (h->s.dsp.h264_idct_add != ff_h264_idct_add_c); //FIXME ugly
for(i=0; i<6; i++ ){
h->dequant4_coeff[i] = h->dequant4_buffer[i];
for(j=0; j<i; j++){
@ -2988,7 +2989,8 @@ static void init_dequant4_coeff_table(H264Context *h){
int shift = div6[q] + 2;
int idx = rem6[q];
for(x=0; x<16; x++)
h->dequant4_coeff[i][q][x] = ((uint32_t)dequant4_coeff_init[idx][(x&1) + ((x>>2)&1)] *
h->dequant4_coeff[i][q][transpose ? (x>>2)|((x<<2)&0xF) : x] =
((uint32_t)dequant4_coeff_init[idx][(x&1) + ((x>>2)&1)] *
h->pps.scaling_matrix4[i][x]) << shift;
}
}