int
h264_decode_seq_parameter_set(elementary_stream_t *st, bitstream_t *bs)
{
int profile_idc, level_idc, poc_type;
unsigned int sps_id, tmp, i, width, height;
int cbpsize = -1;
h264_private_t *p;
if((p = st->es_priv) == NULL)
p = st->es_priv = calloc(1, sizeof(h264_private_t));
profile_idc= read_bits(bs, 8);
read_bits1(bs); //constraint_set0_flag
read_bits1(bs); //constraint_set1_flag
read_bits1(bs); //constraint_set2_flag
read_bits1(bs); //constraint_set3_flag
read_bits(bs, 4); // reserved
level_idc= read_bits(bs, 8);
sps_id= read_golomb_ue(bs);
i = 0;
while(h264_lev2cpbsize[i][0] != -1) {
if(h264_lev2cpbsize[i][0] >= level_idc) {
cbpsize = h264_lev2cpbsize[i][1];
break;
}
i++;
}
if(cbpsize < 0)
return -1;
p->sps[sps_id].cbpsize = cbpsize * 125; /* Convert from kbit to bytes */
if(profile_idc >= 100){ //high profile
if(read_golomb_ue(bs) == 3) //chroma_format_idc
read_bits1(bs); //residual_color_transform_flag
read_golomb_ue(bs); //bit_depth_luma_minus8
read_golomb_ue(bs); //bit_depth_chroma_minus8
read_bits1(bs);
if(read_bits1(bs)) {
/* Scaling matrices */
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 64);
decode_scaling_list(bs, 64);
}
}
p->sps[sps_id].max_frame_num_bits = read_golomb_ue(bs) + 4;
poc_type= read_golomb_ue(bs);
if(poc_type == 0){ //FIXME #define
read_golomb_ue(bs);
} else if(poc_type == 1){//FIXME #define
read_bits1(bs);
read_golomb_se(bs);
read_golomb_se(bs);
tmp = read_golomb_ue(bs); /* poc_cycle_length */
for(i = 0; i < tmp; i++)
read_golomb_se(bs);
}else if(poc_type != 2){
/* Illegal poc */
return -1;
}
tmp = read_golomb_ue(bs);
read_bits1(bs);
width = read_golomb_ue(bs) + 1; /* mb width */
height = read_golomb_ue(bs) + 1; /* mb height */
p->sps[sps_id].width = width * 16;
p->sps[sps_id].height = height * 16;
p->sps[sps_id].mbs_only_flag = read_bits1(bs);
if(!p->sps[sps_id].mbs_only_flag)
p->sps[sps_id].aff = read_bits1(bs);
read_bits1(bs);
/* CROP */
if(read_bits1(bs)){
tmp = read_golomb_ue(bs);
tmp = read_golomb_ue(bs);
tmp = read_golomb_ue(bs);
tmp = read_golomb_ue(bs);
}
if(read_bits1(bs)) {
decode_vui(p, bs, sps_id);
return 0;
} else {
return -1;
}
}
int
h264_decode_seq_parameter_set(elementary_stream_t *st, bitstream_t *bs)
{
uint32_t profile_idc, level_idc, poc_type;
uint32_t sps_id, tmp, i, width, height;
uint32_t cbpsize, mbs_only_flag, aff;
uint32_t max_frame_num_bits;
uint32_t crop_left, crop_right, crop_top, crop_bottom;
h264_private_t *p;
h264_sps_t *sps;
if ((p = st->es_priv) == NULL) {
p = st->es_priv = calloc(1, sizeof(h264_private_t));
p->start = dispatch_clock;
}
profile_idc = read_bits(bs, 8);
skip_bits1(bs); //constraint_set0_flag
skip_bits1(bs); //constraint_set1_flag
skip_bits1(bs); //constraint_set2_flag
skip_bits1(bs); //constraint_set3_flag
skip_bits(bs, 4); // reserved
level_idc = read_bits(bs, 8);
sps_id = read_golomb_ue(bs);
if(sps_id >= MAX_SPS_COUNT)
return -1;
sps = &p->sps[sps_id];
i = 0;
cbpsize = -1;
while (h264_lev2cpbsize[i][0] != -1) {
if (h264_lev2cpbsize[i][0] >= level_idc) {
cbpsize = h264_lev2cpbsize[i][1];
break;
}
i++;
}
if (cbpsize == -1)
return -1;
if (profile_idc >= 100){ //high profile
tmp = read_golomb_ue(bs);
if (tmp == 3) //chroma_format_idc
read_bits1(bs); //residual_color_transform_flag
read_golomb_ue(bs); //bit_depth_luma_minus8
read_golomb_ue(bs); //bit_depth_chroma_minus8
read_bits1(bs); //transform_bypass
if(read_bits1(bs)) {
/* Scaling matrices */
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 16);
decode_scaling_list(bs, 64);
decode_scaling_list(bs, 64);
}
}
max_frame_num_bits = read_golomb_ue(bs) + 4;
poc_type = read_golomb_ue(bs); // pic_order_cnt_type
if(poc_type == 0){
read_golomb_ue(bs);
} else if(poc_type == 1){
skip_bits1(bs);
read_golomb_se(bs);
read_golomb_se(bs);
tmp = read_golomb_ue(bs); /* poc_cycle_length */
for(i = 0; i < tmp; i++)
read_golomb_se(bs);
}else if(poc_type != 2){
/* Illegal poc */
return -1;
}
tmp = read_golomb_ue(bs);
read_bits1(bs);
width = read_golomb_ue(bs) + 1; /* mb width */
height = read_golomb_ue(bs) + 1; /* mb height */
mbs_only_flag = read_bits1(bs);
aff = 0;
if(!mbs_only_flag)
aff = read_bits1(bs);
read_bits1(bs);
/* CROP */
crop_left = crop_right = crop_top = crop_bottom = 0;
if (read_bits1(bs)){
crop_left = read_golomb_ue(bs) * 2;
crop_right = read_golomb_ue(bs) * 2;
crop_top = read_golomb_ue(bs) * 2;
crop_bottom = read_golomb_ue(bs) * 2;
}
if (read_bits1(bs)) /* vui present */
if (decode_vui(sps, bs))
return -1;
sps->max_frame_num_bits = max_frame_num_bits;
sps->mbs_only_flag = mbs_only_flag;
sps->aff = aff;
sps->cbpsize = cbpsize * 125; /* Convert from kbit to bytes */
sps->width = width * 16 - crop_left - crop_right;
sps->height = height * 16 - crop_top - crop_bottom;
sps->valid = 1;
return 0;
}
