/
hevc_stream.c
5184 lines (4754 loc) · 302 KB
/
hevc_stream.c
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/*
hevc_stream.c
Created by leslie_qiwa@gmail.com on 6/8/17
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "bs.h"
#include "h264_stream.h"
#include "hevc_stream.h"
#include "h264_sei.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
static void init_slice_hevc(hevc_stream_t* h)
{
memset(h->sh, 0, sizeof(hevc_slice_header_t));
h->sh->collocated_from_l0_flag = 1;
}
static int NumDeltaPocs[MAX_NUM_SHORT_TERM_REF_PICS];
static int NumNegativePics[MAX_NUM_NEGATIVE_PICS];
static int NumPositivePics[MAX_NUM_POSITIVE_PICS];
static int DeltaPocS0[MAX_NUM_REF_PICS_L0][MAX_NUM_NEGATIVE_PICS];
static int UsedByCurrPicS0[MAX_NUM_REF_PICS_L0][MAX_NUM_NEGATIVE_PICS];
static int DeltaPocS1[MAX_NUM_REF_PICS_L1][MAX_NUM_POSITIVE_PICS];
static int UsedByCurrPicS1[MAX_NUM_REF_PICS_L1][MAX_NUM_POSITIVE_PICS];
//TODO: return right one
static int getNumPicTotalCurr(hevc_sps_t* sps, hevc_slice_header_t* sh)
{
int i;
int NumPicTotalCurr = 0;
int CurrRpsIdx = sps->num_short_term_ref_pic_sets;
if( sh->short_term_ref_pic_set_sps_flag )
CurrRpsIdx = sh->short_term_ref_pic_set_idx;
for( i = 0; i < NumNegativePics[ CurrRpsIdx ]; i++ )
if( UsedByCurrPicS0[ CurrRpsIdx ][ i ] )
NumPicTotalCurr++;
for( i = 0; i < NumPositivePics[ CurrRpsIdx ]; i++)
if( UsedByCurrPicS1[ CurrRpsIdx ][ i ] )
NumPicTotalCurr++;
for( i = 0; i < sh->num_long_term_sps + sh->num_long_term_pics; i++ ) {
int UsedByCurrPicLt = 0;
if( i < sh->num_long_term_sps )
UsedByCurrPicLt = sps->used_by_curr_pic_lt_sps_flag[ sh->lt_idx_sps[ i ] ];
else
UsedByCurrPicLt = sh->used_by_curr_pic_lt_flag[ i ];
if( UsedByCurrPicLt )
NumPicTotalCurr++;
}
return NumPicTotalCurr;
}
static void updateNumDeltaPocs(hevc_st_ref_pic_set_t *st_ref_pic_set, int stRpsIdx) {
int RefRpsIdx = stRpsIdx - ( st_ref_pic_set->delta_idx_minus1 + 1 );
if( st_ref_pic_set->inter_ref_pic_set_prediction_flag ) {
int i, j, dPoc;
int deltaRps = ( 1 - 2 * st_ref_pic_set->delta_rps_sign ) * ( st_ref_pic_set->abs_delta_rps_minus1 + 1 );
i = 0;
for( j = NumPositivePics[ RefRpsIdx ] - 1; j >= 0; j-- ) {
dPoc = DeltaPocS1[ RefRpsIdx ][ j ] + deltaRps;
if( dPoc < 0 && st_ref_pic_set->use_delta_flag[ NumNegativePics[ RefRpsIdx ] + j ] ) {
DeltaPocS0[ stRpsIdx ][ i ] = dPoc;
UsedByCurrPicS0[ stRpsIdx ][ i++ ] = st_ref_pic_set->used_by_curr_pic_flag[ NumNegativePics[ RefRpsIdx ] + j ];
}
}
if( deltaRps < 0 && st_ref_pic_set->use_delta_flag[ NumDeltaPocs[ RefRpsIdx ] ] ) {
DeltaPocS0[ stRpsIdx ][ i ] = deltaRps;
UsedByCurrPicS0[ stRpsIdx ][ i++ ] = st_ref_pic_set->used_by_curr_pic_flag[ NumDeltaPocs[ RefRpsIdx ] ];
}
for( j = 0; j < NumNegativePics[ RefRpsIdx ]; j++ ) {
dPoc = DeltaPocS0[ RefRpsIdx ][ j ] + deltaRps;
if( dPoc < 0 && st_ref_pic_set->use_delta_flag[ j ] ) {
DeltaPocS0[ stRpsIdx ][ i ] = dPoc;
UsedByCurrPicS0[ stRpsIdx ][ i++ ] = st_ref_pic_set->used_by_curr_pic_flag[ j ];
}
}
NumNegativePics[ stRpsIdx ] = i;
i = 0;
for( j = NumNegativePics[ RefRpsIdx ] - 1; j >= 0; j-- ) {
dPoc = DeltaPocS0[ RefRpsIdx ][ j ] + deltaRps;
if( dPoc > 0 && st_ref_pic_set->use_delta_flag[ j ] ) {
DeltaPocS1[ stRpsIdx ][ i ] = dPoc;
UsedByCurrPicS1[ stRpsIdx ][ i++ ] = st_ref_pic_set->used_by_curr_pic_flag[ j ];
}
}
if( deltaRps > 0 && st_ref_pic_set->use_delta_flag[ NumDeltaPocs[ RefRpsIdx ] ] ) {
DeltaPocS1[ stRpsIdx ][ i ] = deltaRps;
UsedByCurrPicS1[ stRpsIdx ][ i++ ] = st_ref_pic_set->used_by_curr_pic_flag[ NumDeltaPocs[ RefRpsIdx ] ];
}
for( j = 0; j < NumPositivePics[ RefRpsIdx ]; j++) {
dPoc = DeltaPocS1[ RefRpsIdx ][ j ] + deltaRps;
if( dPoc > 0 && st_ref_pic_set->use_delta_flag[ NumNegativePics[ RefRpsIdx ] + j ] ) {
DeltaPocS1[ stRpsIdx ][ i ] = dPoc;
UsedByCurrPicS1[ stRpsIdx ][ i++ ] = st_ref_pic_set->used_by_curr_pic_flag[ NumNegativePics[ RefRpsIdx ] + j ];
}
}
NumPositivePics[ stRpsIdx ] = i;
} else {
NumNegativePics[ stRpsIdx ] = st_ref_pic_set->num_negative_pics;
NumPositivePics[ stRpsIdx ] = st_ref_pic_set->num_positive_pics;
}
NumDeltaPocs[ stRpsIdx ] = NumNegativePics[ stRpsIdx ] + NumPositivePics[ stRpsIdx ];
}
static int getSliceSegmentAddressBitLength(hevc_sps_t *sps) {
int MinCbLog2SizeY = sps->log2_min_luma_coding_block_size_minus3 + 3;
int CtbLog2SizeY = MinCbLog2SizeY + sps->log2_diff_max_min_luma_coding_block_size;
int CtbSizeY = 1 << CtbLog2SizeY;
int PicWidthInCtbsY = ceil( sps->pic_width_in_luma_samples * 1.0f / CtbSizeY );
int PicHeightInCtbsY = ceil( sps->pic_height_in_luma_samples * 1.0f / CtbSizeY );
int PicSizeInCtbsY = PicWidthInCtbsY * PicHeightInCtbsY;
return ceil( log2( PicSizeInCtbsY ) ) ;
}
void read_hevc_video_parameter_set_rbsp(hevc_stream_t* h, bs_t* b);
void read_hevc_seq_parameter_set_rbsp(hevc_stream_t* h, bs_t* b);
void read_hevc_sps_range_extension(hevc_sps_range_ext_t* sps_range_ext, bs_t* b);
void read_hevc_pic_parameter_set_rbsp(hevc_stream_t* h, bs_t* b);
void read_hevc_pps_range_extension(hevc_pps_t* pps, bs_t* b);
void read_sei_rbsp(hevc_stream_t* h, bs_t* b);
void read_sei_message(hevc_stream_t* h, bs_t* b);
void read_hevc_access_unit_delimiter_rbsp(hevc_stream_t* h, bs_t* b);
void read_hevc_end_of_seq_rbsp();
void read_end_of_bitstream_rbsp();
void read_filler_data_rbsp(bs_t* b);
void read_hevc_slice_layer_rbsp(hevc_stream_t* h, bs_t* b);
void read_hevc_rbsp_slice_trailing_bits(bs_t* b);
void read_hevc_rbsp_trailing_bits(bs_t* b);
void read_hevc_byte_alignment(bs_t* b);
void read_hevc_profile_tier_level(hevc_profile_tier_level_t* ptl, bs_t* b, int profilePresentFlag, int maxNumSubLayersMinus1);
void read_hevc_scaling_list_data( hevc_scaling_list_data_t *sld, bs_t* b );
void read_hevc_slice_header(hevc_stream_t* h, bs_t* b);
void read_hevc_ref_pic_lists_modification(hevc_stream_t* h, bs_t* b);
void read_hevc_pred_weight_table(hevc_stream_t* h, bs_t* b);
void read_hevc_st_ref_pic_set( hevc_st_ref_pic_set_t *st_ref_pic_set, bs_t* b, int stRpsIdx, int num_short_term_ref_pic_sets );
void read_hevc_vui_parameters(hevc_sps_t* sps, bs_t* b);
void read_hevc_hrd_parameters(hevc_hrd_t* hrd, bs_t* b, int commonInfPresentFlag, int maxNumSubLayersMinus1);
void read_hevc_sub_layer_hrd_parameters(hevc_sub_layer_hrd_t* sub_layer_hrd, bs_t* b, int CpbCnt, int sub_pic_hrd_params_present_flag);
//7.3.1 NAL unit syntax
int read_hevc_nal_unit(hevc_stream_t* h, uint8_t* buf, int size)
{
hevc_nal_t* nal = h->nal;
int nal_size = size;
int rbsp_size = size;
uint8_t* rbsp_buf = (uint8_t*)calloc(1, rbsp_size);
if( 1 )
{
int rc = nal_to_rbsp(buf, &nal_size, rbsp_buf, &rbsp_size);
if (rc < 0) { free(rbsp_buf); return -1; } // handle conversion error
}
if( 0 )
{
rbsp_size = size*3/4; // NOTE this may have to be slightly smaller (3/4 smaller, worst case) in order to be guaranteed to fit
}
bs_t* b = bs_new(rbsp_buf, rbsp_size);
/* forbidden_zero_bit */ bs_skip_u(b, 1);
nal->nal_unit_type = bs_read_u(b, 6);
nal->nal_layer_id = bs_read_u(b, 6);
nal->nal_temporal_id_plus1 = bs_read_u(b, 3);
switch ( nal->nal_unit_type )
{
case HEVC_NAL_UNIT_TYPE_TRAIL_N:
case HEVC_NAL_UNIT_TYPE_TRAIL_R:
case HEVC_NAL_UNIT_TYPE_TSA_N:
case HEVC_NAL_UNIT_TYPE_TSA_R:
case HEVC_NAL_UNIT_TYPE_STSA_N:
case HEVC_NAL_UNIT_TYPE_STSA_R:
case HEVC_NAL_UNIT_TYPE_RADL_N:
case HEVC_NAL_UNIT_TYPE_RADL_R:
case HEVC_NAL_UNIT_TYPE_RASL_N:
case HEVC_NAL_UNIT_TYPE_RASL_R:
case HEVC_NAL_UNIT_TYPE_BLA_W_LP:
case HEVC_NAL_UNIT_TYPE_BLA_W_RADL:
case HEVC_NAL_UNIT_TYPE_BLA_N_LP:
case HEVC_NAL_UNIT_TYPE_IDR_W_RADL:
case HEVC_NAL_UNIT_TYPE_IDR_N_LP:
case HEVC_NAL_UNIT_TYPE_CRA_NUT:
read_hevc_slice_layer_rbsp(h, b);
break;
#ifdef HAVE_SEI
case NAL_UNIT_TYPE_SEI:
read_hevc_sei_rbsp(h, b);
break;
#endif
case HEVC_NAL_UNIT_TYPE_VPS_NUT:
read_hevc_video_parameter_set_rbsp(h, b);
break;
case HEVC_NAL_UNIT_TYPE_SPS_NUT:
read_hevc_seq_parameter_set_rbsp(h, b);
break;
case HEVC_NAL_UNIT_TYPE_PPS_NUT:
read_hevc_pic_parameter_set_rbsp(h, b);
break;
default:
return -1;
}
if (bs_overrun(b)) { bs_free(b); free(rbsp_buf); return -1; }
if( 0 )
{
// now get the actual size used
rbsp_size = bs_pos(b);
int rc = rbsp_to_nal(rbsp_buf, &rbsp_size, buf, &nal_size);
if (rc < 0) { bs_free(b); free(rbsp_buf); return -1; }
}
bs_free(b);
free(rbsp_buf);
return nal_size;
}
//7.3.2.1 Sequence parameter set RBSP syntax
void read_hevc_video_parameter_set_rbsp(hevc_stream_t* h, bs_t* b)
{
int i, j;
hevc_vps_t* vps = h->vps;
if( 1 )
{
memset(vps, 0, sizeof(hevc_vps_t));
}
vps->vps_video_parameter_set_id = bs_read_u(b, 4);
vps->vps_base_layer_internal_flag = bs_read_u1(b);
vps->vps_base_layer_available_flag = bs_read_u1(b);
vps->vps_max_layers_minus1 = bs_read_u(b, 6);
vps->vps_max_sub_layers_minus1 = bs_read_u(b, 3);
vps->vps_temporal_id_nesting_flag = bs_read_u1(b);
/* vps_reserved_0xffff_16bits */ bs_skip_u(b, 16);
read_hevc_profile_tier_level(&vps->ptl, b, 1, vps->vps_max_sub_layers_minus1);
vps->vps_sub_layer_ordering_info_present_flag = bs_read_u1(b);
for( i = ( vps->vps_sub_layer_ordering_info_present_flag ? 0 : vps->vps_max_sub_layers_minus1 );
i <= vps->vps_max_sub_layers_minus1; i++ ) {
vps->vps_max_dec_pic_buffering_minus1[ i ] = bs_read_ue(b);
vps->vps_max_num_reorder_pics[ i ] = bs_read_ue(b);
vps->vps_max_latency_increase_plus1[ i ] = bs_read_ue(b);
}
vps->vps_max_layer_id = bs_read_u(b, 6);
vps->vps_num_layer_sets_minus1 = bs_read_ue(b);
for( i = 1; i <= vps->vps_num_layer_sets_minus1; i++ )
for( j = 0; j <= vps->vps_max_layer_id; j++ ) {
vps->layer_id_included_flag[ i ][ j ] = bs_read_u1(b);
}
vps->vps_timing_info_present_flag = bs_read_u1(b);
if( vps->vps_timing_info_present_flag ) {
vps->vps_num_units_in_tick = bs_read_u(b, 32);
vps->vps_time_scale = bs_read_u(b, 32);
vps->vps_poc_proportional_to_timing_flag = bs_read_u1(b);
if( vps->vps_poc_proportional_to_timing_flag ) {
vps->vps_num_ticks_poc_diff_one_minus1 = bs_read_ue(b);
}
vps->vps_num_hrd_parameters = bs_read_ue(b);
for( i = 0; i < vps->vps_num_hrd_parameters; i++ ) {
vps->hrd_layer_set_idx[ i ] = bs_read_ue(b);
if (i > 0) {
vps->cprms_present_flag[ i ] = bs_read_u1(b);
}
read_hevc_hrd_parameters(&vps->hrd[i], b,
vps->cprms_present_flag[ i ],
vps->vps_max_sub_layers_minus1);
}
}
vps->vps_extension_flag = bs_read_u1(b);
//TODO: support extension data
//if (vps->vps_extension_flag)
read_hevc_rbsp_trailing_bits(b);
}
//7.3.2.2 Sequence parameter set RBSP syntax
void read_hevc_seq_parameter_set_rbsp(hevc_stream_t* h, bs_t* b)
{
int i;
hevc_sps_t* sps = h->sps;
if( 1 )
{
memset(sps, 0, sizeof(hevc_sps_t));
}
sps->sps_video_parameter_set_id = bs_read_u(b, 4);
sps->sps_max_sub_layers_minus1 = bs_read_u(b, 3);
sps->sps_temporal_id_nesting_flag = bs_read_u1(b);
read_hevc_profile_tier_level(&sps->ptl, b, 1, sps->sps_max_sub_layers_minus1);
sps->sps_seq_parameter_set_id = bs_read_ue(b);
sps->chroma_format_idc = bs_read_ue(b);
if( sps->chroma_format_idc == 3 ) {
sps->separate_colour_plane_flag = bs_read_u1(b);
}
sps->pic_width_in_luma_samples = bs_read_ue(b);
sps->pic_height_in_luma_samples = bs_read_ue(b);
sps->conformance_window_flag = bs_read_u1(b);
if( sps->conformance_window_flag ) {
sps->conf_win_left_offset = bs_read_ue(b);
sps->conf_win_right_offset = bs_read_ue(b);
sps->conf_win_top_offset = bs_read_ue(b);
sps->conf_win_bottom_offset = bs_read_ue(b);
}
sps->bit_depth_luma_minus8 = bs_read_ue(b);
sps->bit_depth_chroma_minus8 = bs_read_ue(b);
sps->log2_max_pic_order_cnt_lsb_minus4 = bs_read_ue(b);
sps->sps_sub_layer_ordering_info_present_flag = bs_read_u1(b);
for( i = ( sps->sps_sub_layer_ordering_info_present_flag ? 0 : sps->sps_max_sub_layers_minus1 );
i <= sps->sps_max_sub_layers_minus1; i++ ) {
sps->sps_max_dec_pic_buffering_minus1 [ i ] = bs_read_ue(b);
sps->sps_max_num_reorder_pics [ i ] = bs_read_ue(b);
sps->sps_max_latency_increase_plus1 [ i ] = bs_read_ue(b);
}
sps->log2_min_luma_coding_block_size_minus3 = bs_read_ue(b);
sps->log2_diff_max_min_luma_coding_block_size = bs_read_ue(b);
sps->log2_min_luma_transform_block_size_minus2 = bs_read_ue(b);
sps->log2_diff_max_min_luma_transform_block_size = bs_read_ue(b);
sps->max_transform_hierarchy_depth_inter = bs_read_ue(b);
sps->max_transform_hierarchy_depth_intra = bs_read_ue(b);
sps->scaling_list_enabled_flag = bs_read_u1(b);
if( sps->scaling_list_enabled_flag ) {
sps->sps_scaling_list_data_present_flag = bs_read_u1(b);
if( sps->sps_scaling_list_data_present_flag ) {
read_hevc_scaling_list_data(&sps->scaling_list_data, b);
}
}
sps->amp_enabled_flag = bs_read_u1(b);
sps->sample_adaptive_offset_enabled_flag = bs_read_u1(b);
sps->pcm_enabled_flag = bs_read_u1(b);
if( sps->pcm_enabled_flag ) {
sps->pcm_sample_bit_depth_luma_minus1 = bs_read_u(b, 4);
sps->pcm_sample_bit_depth_chroma_minus1 = bs_read_u(b, 4);
sps->log2_min_pcm_luma_coding_block_size_minus3 = bs_read_ue(b);
sps->log2_diff_max_min_pcm_luma_coding_block_size = bs_read_ue(b);
sps->pcm_loop_filter_disabled_flag = bs_read_u1(b);
}
sps->num_short_term_ref_pic_sets = bs_read_ue(b);
for( i = 0; i < sps->num_short_term_ref_pic_sets; i++) {
read_hevc_st_ref_pic_set(&sps->st_ref_pic_set[i], b, i, sps->num_short_term_ref_pic_sets);
}
sps->long_term_ref_pics_present_flag = bs_read_u1(b);
if( sps->long_term_ref_pics_present_flag ) {
sps->num_long_term_ref_pics_sps = bs_read_ue(b);
for( i = 0; i < sps->num_long_term_ref_pics_sps; i++ ) {
sps->lt_ref_pic_poc_lsb_sps[ i ] = bs_read_u(b, sps->log2_max_pic_order_cnt_lsb_minus4 + 4 );
sps->used_by_curr_pic_lt_sps_flag[ i ] = bs_read_u1(b);
}
}
sps->sps_temporal_mvp_enabled_flag = bs_read_u1(b);
sps->strong_intra_smoothing_enabled_flag = bs_read_u1(b);
sps->vui_parameters_present_flag = bs_read_u1(b);
if( sps->vui_parameters_present_flag ) {
read_hevc_vui_parameters(sps, b);
}
sps->sps_extension_present_flag = bs_read_u1(b);
if( sps->sps_extension_present_flag ) {
sps->sps_range_extension_flag = bs_read_u1(b);
sps->sps_multilayer_extension_flag = bs_read_u1(b);
sps->sps_3d_extension_flag = bs_read_u1(b);
sps->sps_extension_5bits = bs_read_u(b, 5);
}
if( sps->sps_range_extension_flag ) {
read_hevc_sps_range_extension( &sps->sps_range_ext, b);
}
if( 1 )
{
memcpy(h->sps_table[sps->sps_seq_parameter_set_id], h->sps, sizeof(hevc_sps_t));
}
}
//7.3.2.2.2 Sequence parameter set range extension syntax
void read_hevc_sps_range_extension(hevc_sps_range_ext_t* sps_range_ext, bs_t* b)
{
sps_range_ext->transform_skip_rotation_enabled_flag = bs_read_u1(b);
sps_range_ext->transform_skip_context_enabled_flag = bs_read_u1(b);
sps_range_ext->implicit_rdpcm_enabled_flag = bs_read_u1(b);
sps_range_ext->explicit_rdpcm_enabled_flag = bs_read_u1(b);
sps_range_ext->extended_precision_processing_flag = bs_read_u1(b);
sps_range_ext->intra_smoothing_disabled_flag = bs_read_u1(b);
sps_range_ext->high_precision_offsets_enabled_flag = bs_read_u1(b);
sps_range_ext->persistent_rice_adaptation_enabled_flag = bs_read_u1(b);
sps_range_ext->cabac_bypass_alignment_enabled_flag = bs_read_u1(b);
}
//7.3.2.3 Picture parameter set RBSP syntax
void read_hevc_pic_parameter_set_rbsp(hevc_stream_t* h, bs_t* b)
{
int i;
hevc_pps_t* pps = h->pps;
if( 1 )
{
memset(pps, 0, sizeof(hevc_pps_t));
}
pps->pic_parameter_set_id = bs_read_ue(b);
pps->seq_parameter_set_id = bs_read_ue(b);
pps->dependent_slice_segments_enabled_flag = bs_read_u1(b);
pps->output_flag_present_flag = bs_read_u1(b);
pps->num_extra_slice_header_bits = bs_read_u(b, 3 );
pps->sign_data_hiding_enabled_flag = bs_read_u1(b);
pps->cabac_init_present_flag = bs_read_u1(b);
pps->num_ref_idx_l0_default_active_minus1 = bs_read_ue(b);
pps->num_ref_idx_l1_default_active_minus1 = bs_read_ue(b);
pps->init_qp_minus26 = bs_read_se(b);
pps->constrained_intra_pred_flag = bs_read_u1(b);
pps->transform_skip_enabled_flag = bs_read_u1(b);
pps->cu_qp_delta_enabled_flag = bs_read_u1(b);
if( pps->cu_qp_delta_enabled_flag ) {
pps->diff_cu_qp_delta_depth = bs_read_ue(b);
}
pps->pps_cb_qp_offset = bs_read_se(b);
pps->pps_cr_qp_offset = bs_read_se(b);
pps->pps_slice_chroma_qp_offsets_present_flag = bs_read_u1(b);
pps->weighted_pred_flag = bs_read_u1(b);
pps->weighted_bipred_flag = bs_read_u1(b);
pps->transquant_bypass_enabled_flag = bs_read_u1(b);
pps->tiles_enabled_flag = bs_read_u1(b);
pps->entropy_coding_sync_enabled_flag = bs_read_u1(b);
if( pps->tiles_enabled_flag ) {
pps->num_tile_columns_minus1 = bs_read_ue(b);
pps->num_tile_rows_minus1 = bs_read_ue(b);
pps->uniform_spacing_flag = bs_read_u1(b);
if( !pps->uniform_spacing_flag ) {
for( i = 0; i < pps->num_tile_columns_minus1; i++ ) {
pps->column_width_minus1[ i ] = bs_read_ue(b);
}
for( i = 0; i < pps->num_tile_rows_minus1; i++ ) {
pps->row_height_minus1[ i ] = bs_read_ue(b);
}
}
pps->loop_filter_across_tiles_enabled_flag = bs_read_u1(b);
}
pps->pps_loop_filter_across_slices_enabled_flag = bs_read_u1(b);
pps->deblocking_filter_control_present_flag = bs_read_u1(b);
if( pps->deblocking_filter_control_present_flag ) {
pps->deblocking_filter_override_enabled_flag = bs_read_u1(b);
pps->pps_deblocking_filter_disabled_flag = bs_read_u1(b);
if( pps->pps_deblocking_filter_disabled_flag ) {
pps->pps_beta_offset_div2 = bs_read_se(b);
pps->pps_tc_offset_div2 = bs_read_se(b);
}
}
pps->pps_scaling_list_data_present_flag = bs_read_u1(b);
if( pps->pps_scaling_list_data_present_flag ) {
read_hevc_scaling_list_data(&pps->scaling_list_data, b);
}
pps->lists_modification_present_flag = bs_read_u1(b);
pps->log2_parallel_merge_level_minus2 = bs_read_ue(b);
pps->slice_segment_header_extension_present_flag = bs_read_u1(b);
pps->pps_extension_present_flag = bs_read_u1(b);
if( pps->pps_extension_present_flag ) {
pps->pps_range_extension_flag = bs_read_u1(b);
pps->pps_multilayer_extension_flag = bs_read_u1(b);
pps->pps_3d_extension_flag = bs_read_u1(b);
pps->pps_extension_5bits = bs_read_u1(b);
}
if( pps->pps_range_extension_flag ) {
read_hevc_pps_range_extension( pps, b);
}
read_hevc_rbsp_trailing_bits(b);
if( 1 )
{
memcpy(h->pps_table[pps->pic_parameter_set_id], h->pps, sizeof(hevc_pps_t));
}
}
//7.3.2.3.2 Picture parameter set range extension syntax
void read_hevc_pps_range_extension(hevc_pps_t* pps, bs_t* b)
{
hevc_pps_range_ext_t *pps_range_ext = &pps->pps_range_ext;;
if( pps->transform_skip_enabled_flag ) {
pps_range_ext->log2_max_transform_skip_block_size_minus2 = bs_read_ue(b);
}
pps_range_ext->cross_component_prediction_enabled_flag = bs_read_u1(b);
pps_range_ext->chroma_qp_offset_list_enabled_flag = bs_read_u1(b);
if( pps_range_ext->chroma_qp_offset_list_enabled_flag ) {
pps_range_ext->diff_cu_chroma_qp_offset_depth = bs_read_ue(b);
pps_range_ext->chroma_qp_offset_list_len_minus1 = bs_read_ue(b);
for( int i = 0; i <= pps_range_ext->chroma_qp_offset_list_len_minus1; i++ ) {
pps_range_ext->cb_qp_offset_list[ i ] = bs_read_se(b);
pps_range_ext->cr_qp_offset_list[ i ] = bs_read_se(b);
}
}
pps_range_ext->log2_sao_offset_scale_luma = bs_read_ue(b);
pps_range_ext->log2_sao_offset_scale_chroma = bs_read_ue(b);
}
#ifdef HAVE_SEI
//7.3.2.4 Supplemental enhancement information RBSP syntax
void read_sei_rbsp(hevc_stream_t* h, bs_t* b)
{
if( 1 )
{
for( int i = 0; i < h->num_seis; i++ ) {
sei_free(h->seis[i]);
}
h->num_seis = 0;
do {
h->num_seis++;
h->seis = (sei_t**)realloc(h->seis, h->num_seis * sizeof(sei_t*));
h->seis[h->num_seis - 1] = sei_new();
h->sei = h->seis[h->num_seis - 1];
read_sei_message(h, b);
} while( more_rbsp_data(h, b) );
}
if( 0 )
{
for (int i = 0; i < h->num_seis; i++) {
h->sei = h->seis[i];
read_sei_message(h, b);
}
h->sei = NULL;
}
read_hevc_rbsp_trailing_bits(b);
}
//7.3.5 Supplemental enhancement information message syntax
void read_sei_message(hevc_stream_t* h, bs_t* b)
{
if( 0 )
{
_write_ff_coded_number(b, h->sei->payloadType);
_write_ff_coded_number(b, h->sei->payloadSize);
}
if( 1 )
{
h->sei->payloadType = _read_ff_coded_number(b);
h->sei->payloadSize = _read_ff_coded_number(b);
}
read_sei_payload( h, b, h->sei->payloadType, h->sei->payloadSize );
}
#endif
//7.3.2.5 Access unit delimiter RBSP syntax
void read_hevc_access_unit_delimiter_rbsp(hevc_stream_t* h, bs_t* b)
{
h->aud->primary_pic_type = bs_read_u(b, 3);
read_hevc_rbsp_trailing_bits(b);
}
//7.3.2.6 End of sequence RBSP syntax
void read_hevc_end_of_seq_rbsp()
{
}
//7.3.2.7 End of bitstream RBSP syntax
void read_end_of_bitstream_rbsp()
{
}
//7.3.2.8 Filler data RBSP syntax
void read_filler_data_rbsp(bs_t* b)
{
while( bs_next_bits(b, 8) == 0xFF )
{
/* ff_byte */ bs_skip_u(b, 8);
}
read_hevc_rbsp_trailing_bits(b);
}
//7.3.2.9 Slice segment layer RBSP syntax
void read_hevc_slice_layer_rbsp(hevc_stream_t* h, bs_t* b)
{
read_hevc_slice_header(h, b);
hevc_slice_data_rbsp_t* slice_data = h->slice_data;
if ( slice_data != NULL )
{
if ( slice_data->rbsp_buf != NULL ) free( slice_data->rbsp_buf );
uint8_t *sptr = b->p + (!!b->bits_left); // CABAC-specific: skip alignment bits, if there are any
slice_data->rbsp_size = b->end - sptr;
slice_data->rbsp_buf = (uint8_t*)malloc(slice_data->rbsp_size);
memcpy( slice_data->rbsp_buf, sptr, slice_data->rbsp_size );
}
//read_hevc_slice_data(h, b); /* all categories of slice_data( ) syntax */
read_hevc_rbsp_slice_trailing_bits( b );
}
//7.3.2.10 RBSP slice trailing bits syntax
void read_hevc_rbsp_slice_trailing_bits(bs_t* b)
{
read_hevc_rbsp_trailing_bits(b);
//while( more_rbsp_trailing_data(b) )
//{
// value( cabac_zero_word, f(16, 0x0000) );
//}
}
//7.3.2.11 RBSP trailing bits syntax
void read_hevc_rbsp_trailing_bits(bs_t* b)
{
/* rbsp_stop_one_bit */ bs_skip_u(b, 1);
while( !bs_byte_aligned(b) )
{
/* rbsp_alignment_zero_bit */ bs_skip_u(b, 1);
}
}
//7.3.2.12 Byte alignment syntax
void read_hevc_byte_alignment(bs_t* b)
{
/* alignment_bit_equal_to_one */ bs_skip_u(b, 1);
while( !bs_byte_aligned(b) )
{
/* alignment_bit_equal_to_zero */ bs_skip_u(b, 1);
}
}
//7.3.3 Profile, tier and level syntax
void read_hevc_profile_tier_level(hevc_profile_tier_level_t* ptl, bs_t* b, int profilePresentFlag, int maxNumSubLayersMinus1)
{
int i, j;
if( profilePresentFlag ) {
ptl->general_profile_space = bs_read_u(b, 2);
ptl->general_tier_flag = bs_read_u1(b);
ptl->general_profile_idc = bs_read_u(b, 5);
for( i = 0; i < 32; i++ ) {
ptl->general_profile_compatibility_flag[ i ] = bs_read_u1(b);
}
ptl->general_progressive_source_flag = bs_read_u1(b);
ptl->general_interlaced_source_flag = bs_read_u1(b);
ptl->general_non_packed_constraint_flag = bs_read_u1(b);
ptl->general_frame_only_constraint_flag = bs_read_u1(b);
if( ptl->general_profile_idc == 4 || ptl->general_profile_compatibility_flag[ 4 ] ||
ptl->general_profile_idc == 5 || ptl->general_profile_compatibility_flag[ 5 ] ||
ptl->general_profile_idc == 6 || ptl->general_profile_compatibility_flag[ 6 ] ||
ptl->general_profile_idc == 7 || ptl->general_profile_compatibility_flag[ 7 ] ) {
ptl->general_max_12bit_constraint_flag = bs_read_u1(b);
ptl->general_max_10bit_constraint_flag = bs_read_u1(b);
ptl->general_max_8bit_constraint_flag = bs_read_u1(b);
ptl->general_max_422chroma_constraint_flag = bs_read_u1(b);
ptl->general_max_420chroma_constraint_flag = bs_read_u1(b);
ptl->general_max_monochrome_constraint_flag = bs_read_u1(b);
ptl->general_intra_constraint_flag = bs_read_u1(b);
ptl->general_one_picture_only_constraint_flag = bs_read_u1(b);
ptl->general_lower_bit_rate_constraint_flag = bs_read_u1(b);
/* general_reserved_zero_34bits */ bs_skip_u(b, 34);
} else {
/* general_reserved_zero_43bits */ bs_skip_u(b, 43);
}
if( ( ptl->general_profile_idc >= 1 && ptl->general_profile_idc <= 5 ) ||
ptl->general_profile_compatibility_flag[ 1 ] ||
ptl->general_profile_compatibility_flag[ 2 ] ||
ptl->general_profile_compatibility_flag[ 3 ] ||
ptl->general_profile_compatibility_flag[ 4 ] ||
ptl->general_profile_compatibility_flag[ 5 ] ) {
ptl->general_inbld_flag = bs_read_u1(b);
} else {
/* general_reserved_zero_bit */ bs_skip_u(b, 1);
}
ptl->general_level_idc = bs_read_u8(b);
for( i = 0; i < maxNumSubLayersMinus1; i++ ) {
ptl->sub_layer_profile_present_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_level_present_flag[ i ] = bs_read_u1(b);
}
if( maxNumSubLayersMinus1 > 0 ) {
for( i = maxNumSubLayersMinus1; i < 8; i++ ) {
/* reserved_zero_xxbits */ bs_skip_u(b, 2);
}
}
for( i = 0; i < maxNumSubLayersMinus1; i++ ) {
if( ptl->sub_layer_profile_present_flag[ i ] ) {
ptl->sub_layer_profile_space[ i ] = bs_read_u(b, 2);
ptl->sub_layer_tier_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_profile_idc[ i ] = bs_read_u(b, 5);
for( j = 0; j < 32; j++ ) {
ptl->sub_layer_profile_compatibility_flag[ i ][ j ] = bs_read_u(b, 1);
}
ptl->sub_layer_progressive_source_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_interlaced_source_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_non_packed_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_frame_only_constraint_flag[ i ] = bs_read_u1(b);
if( ptl->sub_layer_profile_idc[ i ] == 4 ||
ptl->sub_layer_profile_compatibility_flag[ i ][ 4 ] ||
ptl->sub_layer_profile_idc[ i ] == 5 ||
ptl->sub_layer_profile_compatibility_flag[ i ][ 5 ] ||
ptl->sub_layer_profile_idc[ i ] == 6 ||
ptl->sub_layer_profile_compatibility_flag[ i ][ 6 ] ||
ptl->sub_layer_profile_idc[ i ] == 7 ||
ptl->sub_layer_profile_compatibility_flag[ i ][ 7 ] ) {
ptl->sub_layer_max_12bit_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_max_10bit_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_max_8bit_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_max_422chroma_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_max_420chroma_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_max_monochrome_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_intra_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_one_picture_only_constraint_flag[ i ] = bs_read_u1(b);
ptl->sub_layer_lower_bit_rate_constraint_flag[ i ] = bs_read_u1(b);
/* sub_layer_reserved_zero_34bits */ bs_skip_u(b, 34);
} else {
/* sub_layer_reserved_zero_43bits */ bs_skip_u(b, 43);
}
if( ( ptl->sub_layer_profile_idc[ i ] >= 1 && ptl->sub_layer_profile_idc[ i ] <= 5 ) ||
ptl->sub_layer_profile_compatibility_flag[ 1 ] ||
ptl->sub_layer_profile_compatibility_flag[ 2 ] ||
ptl->sub_layer_profile_compatibility_flag[ 3 ] ||
ptl->sub_layer_profile_compatibility_flag[ 4 ] ||
ptl->sub_layer_profile_compatibility_flag[ 5 ] ) {
ptl->sub_layer_inbld_flag[ i ] = bs_read_u1(b);
} else {
/* sub_layer_reserved_zero_bit */ bs_skip_u(b, 1);
}
}
if( ptl->sub_layer_level_present_flag[ i ] ) {
ptl->sub_layer_level_idc[ i ] = bs_read_u8(b);
}
}
}
}
//7.3.4 Scaling list data syntax
void read_hevc_scaling_list_data( hevc_scaling_list_data_t *sld, bs_t* b )
{
int nextCoef, coefNum;
for( int sizeId = 0; sizeId < 4; sizeId++ )
for( int matrixId = 0; matrixId < 6; matrixId += ( sizeId == 3 ) ? 3 : 1 ) {
sld->scaling_list_pred_mode_flag[ sizeId ][ matrixId ] = bs_read_u1(b);
if( !sld->scaling_list_pred_mode_flag[ sizeId ][ matrixId ] ) {
sld->scaling_list_pred_matrix_id_delta[ sizeId ][ matrixId ] = bs_read_ue(b);
} else {
nextCoef = 8;
coefNum=MIN(64, (1 << (4+(sizeId << 1))));
if( sizeId > 1 ) {
sld->scaling_list_dc_coef_minus8[ sizeId - 2 ][ matrixId ] = bs_read_se(b);
}
for( int i = 0; i < coefNum; i++) {
sld->scaling_list_delta_coef[ sizeId ][ matrixId ] = bs_read_se(b);
}
}
}
}
//7.3.6 Slice header syntax
void read_hevc_slice_header(hevc_stream_t* h, bs_t* b)
{
int i;
hevc_slice_header_t* sh = h->sh;
if( 1 )
{
init_slice_hevc(h);
}
hevc_nal_t* nal = h->nal;
sh->first_slice_segment_in_pic_flag = bs_read_u1(b);
if( nal->nal_unit_type >= HEVC_NAL_UNIT_TYPE_BLA_W_LP &&
nal->nal_unit_type <= HEVC_NAL_UNIT_TYPE_RSV_IRAP_VCL23) {
sh->no_output_of_prior_pics_flag = bs_read_u1(b);
}
sh->pic_parameter_set_id = bs_read_ue(b);
hevc_pps_t* pps = &h->pps[sh->pic_parameter_set_id];
hevc_sps_t* sps = &h->sps[pps->seq_parameter_set_id];
//set default value
sh->num_ref_idx_l0_active_minus1 = pps->num_ref_idx_l0_default_active_minus1;
sh->num_ref_idx_l1_active_minus1 = pps->num_ref_idx_l1_default_active_minus1;
if( !sh->first_slice_segment_in_pic_flag ) {
if( pps->dependent_slice_segments_enabled_flag ) {
sh->dependent_slice_segment_flag = bs_read_u1(b);
}
sh->slice_segment_address = bs_read_u(b, getSliceSegmentAddressBitLength( sps ) );
}
if( !sh->dependent_slice_segment_flag ) {
for( i = 0; i < pps->num_extra_slice_header_bits; i++ ) {
/* slice_reserved_flag */ bs_skip_u(b, 1);
}
sh->slice_type = bs_read_ue(b);
if( pps->output_flag_present_flag ) {
sh->pic_output_flag = bs_read_u1(b);
}
if( sps->separate_colour_plane_flag == 1 ) {
sh->colour_plane_id = bs_read_u(b, 2);
}
if( nal->nal_unit_type != HEVC_NAL_UNIT_TYPE_IDR_W_RADL &&
nal->nal_unit_type != HEVC_NAL_UNIT_TYPE_IDR_N_LP) {
sh->slice_pic_order_cnt_lsb = bs_read_u(b, sps->log2_max_pic_order_cnt_lsb_minus4 + 4 );
sh->short_term_ref_pic_set_sps_flag = bs_read_u1(b);
if( !sh->short_term_ref_pic_set_sps_flag ) {
read_hevc_st_ref_pic_set( &sh->st_ref_pic_set, b, sps->num_short_term_ref_pic_sets, sps->num_short_term_ref_pic_sets );
} else if( sps->num_short_term_ref_pic_sets > 1 ) {
sh->short_term_ref_pic_set_idx = bs_read_u(b, ceil( log2( sps->num_short_term_ref_pic_sets ) ) );
}
if( sps->long_term_ref_pics_present_flag ) {
if( sps->num_long_term_ref_pics_sps > 0 ) {
sh->num_long_term_sps = bs_read_ue(b);
}
sh->num_long_term_pics = bs_read_ue(b);
for( i = 0; i < sh->num_long_term_sps + sh->num_long_term_pics; i++ ) {
if( i < sh->num_long_term_sps ) {
if( sps->num_long_term_ref_pics_sps > 1 ) {
sh->lt_idx_sps[ i ] = bs_read_u(b, ceil( log2( sps->num_long_term_ref_pics_sps ) ) );
}
} else {
sh->poc_lsb_lt[ i ] = bs_read_u(b, sps->log2_max_pic_order_cnt_lsb_minus4 + 4 );
sh->used_by_curr_pic_lt_flag[ i ] = bs_read_u1(b);
}
sh->delta_poc_msb_present_flag[ i ] = bs_read_u1(b);
if( sh->delta_poc_msb_present_flag[ i ]) {
sh->delta_poc_msb_cycle_lt[ i ] = bs_read_ue(b);
}
}
}
if( sps->sps_temporal_mvp_enabled_flag ) {
sh->slice_temporal_mvp_enabled_flag = bs_read_u1(b);
}
}
if( sps->sample_adaptive_offset_enabled_flag ) {
sh->slice_sao_luma_flag = bs_read_u1(b);
int ChromaArrayType = 0;
if( sps->separate_colour_plane_flag == 0) {
ChromaArrayType = sps->chroma_format_idc;
}
if( ChromaArrayType != 0 ) {
sh->slice_sao_chroma_flag = bs_read_u1(b);
}
}
if( sh->slice_type == HEVC_SLICE_TYPE_P || sh->slice_type == HEVC_SLICE_TYPE_B ){
sh->num_ref_idx_active_override_flag = bs_read_u1(b);
if( sh->num_ref_idx_active_override_flag ) {
sh->num_ref_idx_l0_active_minus1 = bs_read_ue(b);
if( sh->slice_type == HEVC_SLICE_TYPE_B ) {
sh->num_ref_idx_l1_active_minus1 = bs_read_ue(b);
}
}
if( pps->lists_modification_present_flag && getNumPicTotalCurr( sps, sh ) > 1 ) {
read_hevc_ref_pic_lists_modification( h, b );
}
if( sh->slice_type == HEVC_SLICE_TYPE_B ) {
sh->mvd_l1_zero_flag = bs_read_u1(b);
}
if( pps->cabac_init_present_flag ) {
sh->cabac_init_flag = bs_read_u1(b);
}
if( sh->slice_temporal_mvp_enabled_flag ) {
if( sh->slice_type == HEVC_SLICE_TYPE_B ) {
sh->collocated_from_l0_flag = bs_read_u1(b);
}
if( ( sh->collocated_from_l0_flag && sh->num_ref_idx_l0_active_minus1 > 0 ) ||
( !sh->collocated_from_l0_flag && sh->num_ref_idx_l1_active_minus1 > 0 ) ) {
sh->collocated_ref_idx = bs_read_ue(b);
}
}
if( ( pps->weighted_pred_flag && sh->slice_type == HEVC_SLICE_TYPE_P ) ||
( pps->weighted_bipred_flag && sh->slice_type == HEVC_SLICE_TYPE_B ) ) {
read_hevc_pred_weight_table( h, b );
}
sh->five_minus_max_num_merge_cand = bs_read_ue(b);
}
sh->slice_qp_delta = bs_read_se(b);
if( pps->pps_slice_chroma_qp_offsets_present_flag ) {
sh->slice_cb_qp_offset = bs_read_se(b);
sh->slice_cr_qp_offset = bs_read_se(b);
}
if( pps->pps_range_ext.chroma_qp_offset_list_enabled_flag ) {
sh->cu_chroma_qp_offset_enabled_flag = bs_read_u1(b);
}
if( pps->deblocking_filter_override_enabled_flag ) {
sh->deblocking_filter_override_flag = bs_read_u1(b);
}
if( sh->deblocking_filter_override_flag ) {
sh->slice_deblocking_filter_disabled_flag = bs_read_u1(b);
if( !sh->slice_deblocking_filter_disabled_flag ) {
sh->slice_beta_offset_div2 = bs_read_se(b);
sh->slice_tc_offset_div2 = bs_read_se(b);
}
}
if( pps->pps_loop_filter_across_slices_enabled_flag &&
( sh->slice_sao_luma_flag || sh->slice_sao_chroma_flag || !sh->slice_deblocking_filter_disabled_flag ) ) {
sh->slice_loop_filter_across_slices_enabled_flag = bs_read_u1(b);
}
}
if( pps->tiles_enabled_flag || pps->entropy_coding_sync_enabled_flag ) {
sh->num_entry_point_offsets = bs_read_ue(b);
if( sh->num_entry_point_offsets > 0 ) {
sh->offset_len_minus1 = bs_read_ue(b);
for( i = 0; i < sh->num_entry_point_offsets; i++ ) {
sh->entry_point_offset_minus1[ i ] = bs_read_u(b, sh->offset_len_minus1 + 1 );
}
}
}
if( pps->slice_segment_header_extension_present_flag ) {
sh->slice_segment_header_extension_length = bs_read_ue(b);
//TODO: support header extension,
for( i = 0; i < sh->slice_segment_header_extension_length; i++) {
/* slice_segment_header_extension_data_byte */ bs_skip_u(b, 8);
}
}
read_hevc_byte_alignment( b );
}
//7.3.6.2 Reference picture list reordering syntax
void read_hevc_ref_pic_lists_modification(hevc_stream_t* h, bs_t* b)
{
int i;
hevc_slice_header_t* sh = h->sh;
hevc_pps_t* pps = &h->pps[sh->pic_parameter_set_id];
hevc_sps_t* sps = &h->sps[pps->seq_parameter_set_id];
sh->rpld.ref_pic_list_modification_flag_l0 = bs_read_u1(b);
if( sh->rpld.ref_pic_list_modification_flag_l0 ) {
for( i = 0; i <= sh->num_ref_idx_l0_active_minus1; i++ ) {
sh->rpld.list_entry_l0[ i ] = bs_read_u(b, ceil( log2( getNumPicTotalCurr( sps, sh ) ) ) );
}
}
if( sh->slice_type == HEVC_SLICE_TYPE_B ) {
// ERROR: value( sh->rpld.ref_pic_list_modification_flag_l1, 1 );
if( sh->rpld.ref_pic_list_modification_flag_l1 ) {
for( i = 0; i <= sh->num_ref_idx_l1_active_minus1; i++ ) {
sh->rpld.list_entry_l1[ i ] = bs_read_u(b, ceil( log2( getNumPicTotalCurr( sps, sh ) ) ) );
}
}
}
}
//7.3.6.3 Prediction weight table syntax
void read_hevc_pred_weight_table(hevc_stream_t* h, bs_t* b)
{
hevc_slice_header_t* sh = h->sh;
hevc_pps_t* pps = &h->pps[sh->pic_parameter_set_id];
hevc_sps_t* sps = &h->sps[pps->seq_parameter_set_id];
hevc_pred_weight_table_t *pwt = &sh->pwt;
int i, j;
pwt->luma_log2_weight_denom = bs_read_ue(b);
int ChromaArrayType = 0;
if( sps->separate_colour_plane_flag == 0) {
ChromaArrayType = sps->chroma_format_idc;
}
if( ChromaArrayType != 0 ) {
pwt->delta_chroma_log2_weight_denom = bs_read_se(b);
}
for( i = 0; i <= sh->num_ref_idx_l0_active_minus1; i++ ) {
pwt->luma_weight_l0_flag[i] = bs_read_u1(b);
}
if( ChromaArrayType != 0 )
for( i = 0; i <= sh->num_ref_idx_l0_active_minus1; i++ ) {
pwt->chroma_weight_l0_flag[i] = bs_read_u1(b);
}
for( i = 0; i <= sh->num_ref_idx_l0_active_minus1; i++ ) {
if( pwt->luma_weight_l0_flag[i] ) {
pwt->delta_luma_weight_l0[i] = bs_read_se(b);
pwt->luma_offset_l0[i] = bs_read_se(b);
}