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Code Issues Releases Activity

CQM: fix fallback to JVT scaling lists

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Originally committed as revision 4798 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2005-12-31 13:20:24 +00:00
parent 11d86c979c
commit f23af3d825
1 changed files with 14 additions and 13 deletions
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27
libavcodec/h264.c
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@ -7112,18 +7112,19 @@ static inline int decode_vui_parameters(H264Context *h, SPS *sps){
return 0;
}
static void decode_scaling_list(H264Context *h, uint8_t *factors, int size, const uint8_t *default_list){
static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
const uint8_t *jvt_list, const uint8_t *fallback_list){
MpegEncContext * const s = &h->s;
int i, last = 8, next = 8;
const uint8_t *scan = size == 16 ? zigzag_scan : zigzag_scan8x8;
if(!get_bits1(&s->gb)) /* matrix not written, we use the default one */
memcpy(factors, default_list, size*sizeof(uint8_t));
if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
memcpy(factors, fallback_list, size*sizeof(uint8_t));
else
for(i=0;i<size;i++){
if(next)
next = (last + get_se_golomb(&s->gb)) & 0xff;
if(!i && !next){ /* matrix not written, we use the default one */
memcpy(factors, default_list, size*sizeof(uint8_t));
if(!i && !next){ /* matrix not written, we use the preset one */
memcpy(factors, jvt_list, size*sizeof(uint8_t));
break;
}
last = factors[scan[i]] = next ? next : last;
@ -7142,15 +7143,15 @@ static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_s
};
if(get_bits1(&s->gb)){
sps->scaling_matrix_present |= is_sps;
decode_scaling_list(h,scaling_matrix4[0],16,fallback[0]); // Intra, Y
decode_scaling_list(h,scaling_matrix4[1],16,scaling_matrix4[0]); // Intra, Cr
decode_scaling_list(h,scaling_matrix4[2],16,scaling_matrix4[1]); // Intra, Cb
decode_scaling_list(h,scaling_matrix4[3],16,fallback[1]); // Inter, Y
decode_scaling_list(h,scaling_matrix4[4],16,scaling_matrix4[3]); // Inter, Cr
decode_scaling_list(h,scaling_matrix4[5],16,scaling_matrix4[4]); // Inter, Cb
decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
if(is_sps || pps->transform_8x8_mode){
decode_scaling_list(h,scaling_matrix8[0],64,fallback[2]); // Intra, Y
decode_scaling_list(h,scaling_matrix8[1],64,fallback[3]); // Inter, Y
decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]); // Intra, Y
decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[1],fallback[3]); // Inter, Y
}
} else if(fallback_sps) {
memcpy(scaling_matrix4, sps->scaling_matrix4, 6*16*sizeof(uint8_t));