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Don't do non-uniform quantization on zero coeffs.

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Originally committed as revision 5810 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-07-22 03:54:00 +00:00
parent aab7715910
commit 4b94465927
1 changed files with 4 additions and 4 deletions
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8
libavcodec/vc1.c
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@ -2061,13 +2061,13 @@ not_coded:
if(dc_pred_dir) { //left
for(k = 1; k < 8; k++) {
block[k << 3] = ac_val[k] * scale;
if(!v->pquantizer)
if(!v->pquantizer && block[k << 3])
block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;
}
} else { //top
for(k = 1; k < 8; k++) {
block[k] = ac_val[k + 8] * scale;
if(!v->pquantizer)
if(!v->pquantizer && block[k])
block[k] += (block[k] < 0) ? -v->pq : v->pq;
}
}
@ -2260,13 +2260,13 @@ static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int c
if(dc_pred_dir) { //left
for(k = 1; k < 8; k++) {
block[k << 3] = ac_val2[k] * scale;
if(!v->pquantizer)
if(!v->pquantizer && block[k << 3])
block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;
}
} else { //top
for(k = 1; k < 8; k++) {
block[k] = ac_val2[k + 8] * scale;
if(!v->pquantizer)
if(!v->pquantizer && block[k])
block[k] += (block[k] < 0) ? -mquant : mquant;
}
}