int get_svlc(bitreader* br)
{
int v = get_uvlc(br);
if (v==0) return v;
bool negative = ((v&1)==0);
return negative ? -v/2 : (v+1)/2;
}
void read_short_term_ref_pic_set(bitreader* br, ref_pic_set* sets, int idxRps, int num_short_term_ref_pic_sets)
{
char inter_ref_pic_set_prediction_flag=0;
if (idxRps != 0) {
inter_ref_pic_set_prediction_flag = get_bits(br,1);
}
if (inter_ref_pic_set_prediction_flag) {
int delta_idx;
if (idxRps == num_short_term_ref_pic_sets) {
delta_idx = get_uvlc(br)+1;
} else {
delta_idx = 1;
}
int RIdx = idxRps - delta_idx;
assert(RIdx>=0);
int delta_rps_sign = get_bits(br,1);
int abs_delta_rps = get_uvlc(br)+1;
int DeltaRPS = (delta_rps_sign ? -abs_delta_rps : abs_delta_rps);
// bits are stored in this order:
// - all bits for negative Pocs (forward),
// - then all bits for positive Pocs (forward),
// - then bits for '0'
logtrace(LogHeaders,"predicted from %d with delta %d\n",RIdx,DeltaRPS);
int nDeltaPocsRIdx= sets[RIdx].NumDeltaPocs;
char *const used_by_curr_pic_flag = (char *)alloca((nDeltaPocsRIdx+1) * sizeof(char));
char *const use_delta_flag = (char *)alloca((nDeltaPocsRIdx+1) * sizeof(char));
for (int j=0;j<=nDeltaPocsRIdx;j++) {
used_by_curr_pic_flag[j] = get_bits(br,1);
if (!used_by_curr_pic_flag[j]) {
use_delta_flag[j] = get_bits(br,1);
} else {
use_delta_flag[j] = 1;
}
}
logtrace(LogHeaders,"flags: ");
for (int j=0;j<=nDeltaPocsRIdx;j++) {
logtrace(LogHeaders,"%d ", use_delta_flag[j]);
}
logtrace(LogHeaders,"\n");
int nNegativeRIdx = sets[RIdx].NumNegativePics;
// --- update list 0 (negative Poc) ---
// Iterate through all Pocs in decreasing value order (positive reverse, 0, negative forward).
int i=0;
for (int j=sets[RIdx].NumPositivePics-1;j>=0;j--) {
int dPoc = sets[RIdx].DeltaPocS1[j] + DeltaRPS;
if (dPoc<0 && use_delta_flag[nNegativeRIdx+j]) {
sets[idxRps].DeltaPocS0[i] = dPoc;
sets[idxRps].UsedByCurrPicS0[i] = used_by_curr_pic_flag[nNegativeRIdx+j];
i++;
}
}
if (DeltaRPS<0 && use_delta_flag[nDeltaPocsRIdx]) {
sets[idxRps].DeltaPocS0[i] = DeltaRPS;
sets[idxRps].UsedByCurrPicS0[i] = used_by_curr_pic_flag[nDeltaPocsRIdx];
i++;
}
for (int j=0;j<nNegativeRIdx;j++) {
int dPoc = sets[RIdx].DeltaPocS0[j] + DeltaRPS;
if (dPoc<0 && use_delta_flag[j]) {
sets[idxRps].DeltaPocS0[i] = dPoc;
sets[idxRps].UsedByCurrPicS0[i] = used_by_curr_pic_flag[j];
i++;
}
}
sets[idxRps].NumNegativePics = i;
// --- update list 1 (positive Poc) ---
// Iterate through all Pocs in increasing value order (negative reverse, 0, positive forward)
i=0;
for (int j=sets[RIdx].NumNegativePics-1;j>=0;j--) {
int dPoc = sets[RIdx].DeltaPocS0[j] + DeltaRPS;
if (dPoc>0 && use_delta_flag[j]) {
sets[idxRps].DeltaPocS1[i] = dPoc;
sets[idxRps].UsedByCurrPicS1[i] = used_by_curr_pic_flag[j];
i++;
}
}
if (DeltaRPS>0 && use_delta_flag[nDeltaPocsRIdx]) {
sets[idxRps].DeltaPocS1[i] = DeltaRPS;
sets[idxRps].UsedByCurrPicS1[i] = used_by_curr_pic_flag[nDeltaPocsRIdx];
i++;
}
for (int j=0;j<sets[RIdx].NumPositivePics;j++) {
int dPoc = sets[RIdx].DeltaPocS1[j] + DeltaRPS;
if (dPoc>0 && use_delta_flag[nNegativeRIdx+j]) {
sets[idxRps].DeltaPocS1[i] = dPoc;
sets[idxRps].UsedByCurrPicS1[i] = used_by_curr_pic_flag[nNegativeRIdx+j];
i++;
}
}
sets[idxRps].NumPositivePics = i;
sets[idxRps].NumDeltaPocs = sets[idxRps].NumNegativePics + sets[idxRps].NumPositivePics;
} else {
int num_negative_pics = get_uvlc(br);
int num_positive_pics = get_uvlc(br);
assert(num_negative_pics + num_positive_pics <= MAX_NUM_REF_PICS);
sets[idxRps].NumNegativePics = num_negative_pics;
sets[idxRps].NumPositivePics = num_positive_pics;
sets[idxRps].NumDeltaPocs = num_positive_pics + num_negative_pics;
int lastPocS=0;
for (int i=0;i<num_negative_pics;i++) {
int delta_poc_s0 = get_uvlc(br)+1;
char used_by_curr_pic_s0_flag = get_bits(br,1);
logtrace(LogHeaders,"neg: %d %d\n", delta_poc_s0, used_by_curr_pic_s0_flag);
sets[idxRps].DeltaPocS0[i] = lastPocS - delta_poc_s0;
sets[idxRps].UsedByCurrPicS0[i] = used_by_curr_pic_s0_flag;
lastPocS = sets[idxRps].DeltaPocS0[i];
}
lastPocS=0;
for (int i=0;i<num_positive_pics;i++) {
int delta_poc_s1 = get_uvlc(br)+1;
char used_by_curr_pic_s1_flag = get_bits(br,1);
logtrace(LogHeaders,"pos: %d %d\n", delta_poc_s1, used_by_curr_pic_s1_flag);
sets[idxRps].DeltaPocS1[i] = lastPocS + delta_poc_s1;
sets[idxRps].UsedByCurrPicS1[i] = used_by_curr_pic_s1_flag;
lastPocS = sets[idxRps].DeltaPocS1[i];
}
}
compute_NumPoc(&sets[idxRps]);
}
de265_error read_sps(bitreader* br, seq_parameter_set* sps, ref_pic_set** ref_pic_sets)
{
sps->video_parameter_set_id = get_bits(br,4);
sps->sps_max_sub_layers = get_bits(br,3) +1;
if (sps->sps_max_sub_layers>7) {
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
sps->sps_temporal_id_nesting_flag = get_bits(br,1);
read_profile_tier_level(br,&sps->profile_tier_level, true, sps->sps_max_sub_layers);
sps->seq_parameter_set_id = get_uvlc(br);
// --- decode chroma type ---
sps->chroma_format_idc = get_uvlc(br);
if (sps->chroma_format_idc == 3) {
sps->separate_colour_plane_flag = get_bits(br,1);
}
else {
sps->separate_colour_plane_flag = 0;
}
if (sps->separate_colour_plane_flag) {
sps->ChromaArrayType = 0;
}
else {
sps->ChromaArrayType = sps->chroma_format_idc;
}
sps->SubWidthC = SubWidthC [sps->chroma_format_idc];
sps->SubHeightC = SubHeightC[sps->chroma_format_idc];
// --- picture size ---
sps->pic_width_in_luma_samples = get_uvlc(br);
sps->pic_height_in_luma_samples = get_uvlc(br);
sps->conformance_window_flag = get_bits(br,1);
if (sps->conformance_window_flag) {
sps->conf_win_left_offset = get_uvlc(br);
sps->conf_win_right_offset = get_uvlc(br);
sps->conf_win_top_offset = get_uvlc(br);
sps->conf_win_bottom_offset= get_uvlc(br);
}
else {
sps->conf_win_left_offset = 0;
sps->conf_win_right_offset = 0;
sps->conf_win_top_offset = 0;
sps->conf_win_bottom_offset= 0;
}
if (sps->ChromaArrayType==0) {
sps->WinUnitX = 1;
sps->WinUnitY = 1;
}
else {
sps->WinUnitX = SubWidthC[sps->chroma_format_idc];
sps->WinUnitY = SubHeightC[sps->chroma_format_idc];
}
sps->bit_depth_luma = get_uvlc(br) +8;
sps->bit_depth_chroma = get_uvlc(br) +8;
sps->log2_max_pic_order_cnt_lsb = get_uvlc(br) +4;
sps->MaxPicOrderCntLsb = 1<<(sps->log2_max_pic_order_cnt_lsb);
// --- sub_layer_ordering_info ---
sps->sps_sub_layer_ordering_info_present_flag = get_bits(br,1);
int firstLayer = (sps->sps_sub_layer_ordering_info_present_flag ?
0 : sps->sps_max_sub_layers-1 );
for (int i=firstLayer ; i <= sps->sps_max_sub_layers-1; i++ ) {
sps->sps_max_dec_pic_buffering[i] = get_uvlc(br);
sps->sps_max_num_reorder_pics[i] = get_uvlc(br);
sps->sps_max_latency_increase[i] = get_uvlc(br);
}
// copy info to all layers if only specified once
if (sps->sps_sub_layer_ordering_info_present_flag) {
int ref = sps->sps_max_sub_layers-1;
for (int i=0 ; i < sps->sps_max_sub_layers-1; i++ ) {
sps->sps_max_dec_pic_buffering[i] = sps->sps_max_dec_pic_buffering[ref];
sps->sps_max_num_reorder_pics[i] = sps->sps_max_num_reorder_pics[ref];
sps->sps_max_latency_increase[i] = sps->sps_max_latency_increase[ref];
}
}
sps->log2_min_luma_coding_block_size = get_uvlc(br)+3;
sps->log2_diff_max_min_luma_coding_block_size = get_uvlc(br);
sps->log2_min_transform_block_size = get_uvlc(br)+2;
sps->log2_diff_max_min_transform_block_size = get_uvlc(br);
sps->max_transform_hierarchy_depth_inter = get_uvlc(br);
sps->max_transform_hierarchy_depth_intra = get_uvlc(br);
sps->scaling_list_enable_flag = get_bits(br,1);
if (sps->scaling_list_enable_flag) {
sps->sps_scaling_list_data_present_flag = get_bits(br,1);
if (sps->sps_scaling_list_data_present_flag) {
assert(0);
//scaling_list_data()
}
}
sps->amp_enabled_flag = get_bits(br,1);
sps->sample_adaptive_offset_enabled_flag = get_bits(br,1);
sps->pcm_enabled_flag = get_bits(br,1);
if (sps->pcm_enabled_flag) {
sps->pcm_sample_bit_depth_luma = get_bits(br,4)+1;
sps->pcm_sample_bit_depth_chroma = get_bits(br,4)+1;
sps->log2_min_pcm_luma_coding_block_size = get_uvlc(br)+3;
sps->log2_diff_max_min_pcm_luma_coding_block_size = get_uvlc(br);
sps->pcm_loop_filter_disable_flag = get_bits(br,1);
}
sps->num_short_term_ref_pic_sets = get_uvlc(br);
// --- allocate reference pic set ---
// allocate one more for the ref-pic-set that may be sent in the slice header
*ref_pic_sets = (ref_pic_set *)calloc(sizeof(ref_pic_set), sps->num_short_term_ref_pic_sets + 1);
for (int i = 0; i < sps->num_short_term_ref_pic_sets; i++) {
//alloc_ref_pic_set(&(*ref_pic_sets)[i],
//sps->sps_max_dec_pic_buffering[sps->sps_max_sub_layers-1]);
read_short_term_ref_pic_set(br,*ref_pic_sets, i, sps->num_short_term_ref_pic_sets);
dump_short_term_ref_pic_set(&(*ref_pic_sets)[i]);
}
sps->long_term_ref_pics_present_flag = get_bits(br,1);
if (sps->long_term_ref_pics_present_flag) {
sps->num_long_term_ref_pics_sps = get_uvlc(br);
if (sps->num_long_term_ref_pics_sps > 32) {
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
for (int i = 0; i < sps->num_long_term_ref_pics_sps; i++ ) {
sps->lt_ref_pic_poc_lsb_sps[i] = get_bits(br, sps->log2_max_pic_order_cnt_lsb);
sps->used_by_curr_pic_lt_sps_flag[i] = get_bits(br,1);
}
}
else {
sps->num_long_term_ref_pics_sps = 0; // NOTE: missing definition in standard !
}
sps->sps_temporal_mvp_enabled_flag = get_bits(br,1);
sps->strong_intra_smoothing_enable_flag = get_bits(br,1);
sps->vui_parameters_present_flag = get_bits(br,1);
if (sps->vui_parameters_present_flag) {
assert(false);
/*
vui_parameters()
sps_extension_flag
u(1)
if( sps_extension_flag )
while( more_rbsp_data() )
sps_extension_data_flag
u(1)
rbsp_trailing_bits()
*/
}
sps->sps_extension_flag = get_bits(br,1);
if (sps->sps_extension_flag) {
assert(false);
}
check_rbsp_trailing_bits(br);
// --- compute derived values ---
sps->BitDepth_Y = sps->bit_depth_luma;
sps->QpBdOffset_Y = 6*(sps->bit_depth_luma-8);
sps->BitDepth_C = sps->bit_depth_chroma;
sps->QpBdOffset_C = 6*(sps->bit_depth_chroma-8);
sps->Log2MinCbSizeY = sps->log2_min_luma_coding_block_size;
sps->Log2CtbSizeY = sps->Log2MinCbSizeY + sps->log2_diff_max_min_luma_coding_block_size;
sps->MinCbSizeY = 1 << sps->Log2MinCbSizeY;
sps->CtbSizeY = 1 << sps->Log2CtbSizeY;
sps->PicWidthInMinCbsY = sps->pic_width_in_luma_samples / sps->MinCbSizeY;
sps->PicWidthInCtbsY = ceil_div(sps->pic_width_in_luma_samples, sps->CtbSizeY);
sps->PicHeightInMinCbsY = sps->pic_height_in_luma_samples / sps->MinCbSizeY;
sps->PicHeightInCtbsY = ceil_div(sps->pic_height_in_luma_samples,sps->CtbSizeY);
sps->PicSizeInMinCbsY = sps->PicWidthInMinCbsY * sps->PicHeightInMinCbsY;
sps->PicSizeInCtbsY = sps->PicWidthInCtbsY * sps->PicHeightInCtbsY;
sps->PicSizeInSamplesY = sps->pic_width_in_luma_samples * sps->pic_height_in_luma_samples;
if (sps->chroma_format_idc==0 || sps->separate_colour_plane_flag) {
sps->CtbWidthC = 0;
sps->CtbHeightC = 0;
}
else {
sps->CtbWidthC = sps->CtbSizeY / sps->SubWidthC;
sps->CtbHeightC = sps->CtbSizeY / sps->SubHeightC;
}
sps->Log2MinTrafoSize = sps->log2_min_transform_block_size;
sps->Log2MaxTrafoSize = sps->log2_min_transform_block_size + sps->log2_diff_max_min_transform_block_size;
// the following are not in the standard
sps->PicWidthInTbsY = sps->PicWidthInCtbsY << (sps->Log2CtbSizeY - sps->Log2MinTrafoSize);
sps->PicHeightInTbsY = sps->PicHeightInCtbsY << (sps->Log2CtbSizeY - sps->Log2MinTrafoSize);
sps->PicSizeInTbsY = sps->PicWidthInTbsY * sps->PicHeightInTbsY;
sps->sps_read = true;
return DE265_OK;
}
void read_pps(bitreader* br, pic_parameter_set* pps, decoder_context* ctx)
{
pps->pic_parameter_set_id = get_uvlc(br);
pps->seq_parameter_set_id = get_uvlc(br);
pps->dependent_slice_segments_enabled_flag = get_bits(br,1);
pps->output_flag_present_flag = get_bits(br,1);
pps->num_extra_slice_header_bits = get_bits(br,3);
pps->sign_data_hiding_flag = get_bits(br,1);
pps->cabac_init_present_flag = get_bits(br,1);
pps->num_ref_idx_l0_default_active = get_uvlc(br)+1;
pps->num_ref_idx_l1_default_active = get_uvlc(br)+1;
seq_parameter_set* sps = get_sps(ctx, pps->seq_parameter_set_id);
pps->pic_init_qp = get_svlc(br)+26;
pps->constrained_intra_pred_flag = get_bits(br,1);
pps->transform_skip_enabled_flag = get_bits(br,1);
pps->cu_qp_delta_enabled_flag = get_bits(br,1);
if (pps->cu_qp_delta_enabled_flag) {
pps->diff_cu_qp_delta_depth = get_uvlc(br);
} else {
pps->diff_cu_qp_delta_depth = 0;
}
pps->pic_cb_qp_offset = get_svlc(br);
pps->pic_cr_qp_offset = get_svlc(br);
pps->pps_slice_chroma_qp_offsets_present_flag = get_bits(br,1);
pps->weighted_pred_flag = get_bits(br,1);
pps->weighted_bipred_flag = get_bits(br,1);
pps->transquant_bypass_enable_flag = get_bits(br,1);
pps->tiles_enabled_flag = get_bits(br,1);
pps->entropy_coding_sync_enabled_flag = get_bits(br,1);
// --- tiles ---
if (pps->tiles_enabled_flag ) {
pps->num_tile_columns = get_uvlc(br)+1;
pps->num_tile_rows = get_uvlc(br)+1;
pps->uniform_spacing_flag = get_bits(br,1);
assert(pps->num_tile_columns <= DE265_MAX_TILE_COLUMNS);
assert(pps->num_tile_rows <= DE265_MAX_TILE_ROWS);
if (pps->uniform_spacing_flag==false) {
int lastColumnWidth = sps->PicWidthInCtbsY;
int lastRowHeight = sps->PicHeightInCtbsY;
for (int i=0; i<pps->num_tile_columns-1; i++)
{
pps->colWidth[i] = get_uvlc(br)+1;
lastColumnWidth -= pps->colWidth[i];
}
pps->colWidth[pps->num_tile_columns-1] = lastColumnWidth;
for (int i=0; i<pps->num_tile_rows-1; i++)
{
pps->rowHeight[i] = get_uvlc(br)+1;
lastRowHeight -= pps->rowHeight[i];
}
pps->rowHeight[pps->num_tile_rows-1] = lastRowHeight;
}
pps->loop_filter_across_tiles_enabled_flag = get_bits(br,1);
} else {
pps->num_tile_columns = 1;
pps->num_tile_rows = 1;
pps->uniform_spacing_flag = 1;
}
if (pps->uniform_spacing_flag) {
// set columns widths
int *const colPos = (int *)alloca((pps->num_tile_columns+1) * sizeof(int));
for (int i=0; i<=pps->num_tile_columns; i++) {
colPos[i] = i*sps->PicWidthInCtbsY / pps->num_tile_columns;
}
for (int i=0; i<pps->num_tile_columns; i++) {
pps->colWidth[i] = colPos[i+1] - colPos[i];
}
// set row heights
int *const rowPos = (int *)alloca((pps->num_tile_rows+1) * sizeof(int));
for (int i=0; i<=pps->num_tile_rows; i++) {
rowPos[i] = i*sps->PicHeightInCtbsY / pps->num_tile_rows;
}
for (int i=0; i<pps->num_tile_rows; i++) {
pps->rowHeight[i] = rowPos[i+1] - rowPos[i];
}
}
// set tile boundaries
pps->colBd[0]=0;
for (int i=0; i<pps->num_tile_columns; i++) {
pps->colBd[i+1] = pps->colBd[i] + pps->colWidth[i];
}
pps->rowBd[0]=0;
for (int i=0; i<pps->num_tile_rows; i++) {
pps->rowBd[i+1] = pps->rowBd[i] + pps->rowHeight[i];
}
// alloc raster scan arrays
if (pps->CtbAddrRStoTS) {
free(pps->CtbAddrRStoTS);
}
if (pps->CtbAddrTStoRS) {
free(pps->CtbAddrTStoRS);
}
if (pps->TileId) {
free(pps->TileId);
}
if (pps->MinTbAddrZS) {
free(pps->MinTbAddrZS);
}
pps->CtbAddrRStoTS = (int *)malloc( sizeof(int) * sps->PicSizeInCtbsY );
pps->CtbAddrTStoRS = (int *)malloc( sizeof(int) * sps->PicSizeInCtbsY );
pps->TileId = (int *)malloc( sizeof(int) * sps->PicSizeInCtbsY );
pps->MinTbAddrZS = (int *)malloc( sizeof(int) * sps->PicSizeInTbsY );
// raster scan (RS) <-> tile scan (TS) conversion
for (int ctbAddrRS=0 ; ctbAddrRS < sps->PicSizeInCtbsY ; ctbAddrRS++)
{
int tbX = ctbAddrRS % sps->PicWidthInCtbsY;
int tbY = ctbAddrRS / sps->PicWidthInCtbsY;
int tileX=-1,tileY=-1;
for (int i=0; i<pps->num_tile_columns; i++)
if (tbX >= pps->colBd[i])
tileX=i;
for (int j=0; j<pps->num_tile_rows; j++)
if (tbY >= pps->rowBd[j])
tileY=j;
pps->CtbAddrRStoTS[ctbAddrRS] = 0;
for (int i=0; i<tileX; i++)
pps->CtbAddrRStoTS[ctbAddrRS] += pps->rowHeight[tileY]*pps->colWidth[i];
for (int j=0; j<tileY; j++)
{
//pps->CtbAddrRStoTS[ctbAddrRS] += (tbY - pps->rowBd[tileY])*pps->colWidth[tileX];
//pps->CtbAddrRStoTS[ctbAddrRS] += tbX - pps->colBd[tileX];
pps->CtbAddrRStoTS[ctbAddrRS] += sps->PicWidthInCtbsY * pps->rowHeight[j];
}
assert(tileX>=0 && tileY>=0);
pps->CtbAddrRStoTS[ctbAddrRS] += (tbY-pps->rowBd[tileY])*pps->colWidth[tileX];
pps->CtbAddrRStoTS[ctbAddrRS] += tbX - pps->colBd[tileX];
// inverse mapping
pps->CtbAddrTStoRS[ pps->CtbAddrRStoTS[ctbAddrRS] ] = ctbAddrRS;
}
logtrace(LogHeaders,"6.5.1 CtbAddrRSToTS\n");
for (int y=0; y<sps->PicHeightInCtbsY; y++)
{
for (int x=0; x<sps->PicWidthInCtbsY; x++)
{
logtrace(LogHeaders,"%3d ", pps->CtbAddrRStoTS[x + y*sps->PicWidthInCtbsY]);
}
logtrace(LogHeaders,"\n");
}
// tile id
for (int j=0, tIdx=0 ; j<pps->num_tile_rows ; j++)
for (int i=0 ; i<pps->num_tile_columns; i++)
{
for (int y=pps->rowBd[j] ; y<pps->rowBd[j+1] ; y++)
for (int x=pps->colBd[j] ; x<pps->colBd[j+1] ; x++)
pps->TileId[ pps->CtbAddrRStoTS[y*sps->PicWidthInCtbsY + x] ] = tIdx;
tIdx++;
}
// 6.5.2 Z-scan order array initialization process
for (int y=0; y<sps->PicHeightInTbsY; y++)
for (int x=0; x<sps->PicWidthInTbsY; x++)
{
int tbX = (x<<sps->Log2MinTrafoSize)>>sps->Log2CtbSizeY;
int tbY = (y<<sps->Log2MinTrafoSize)>>sps->Log2CtbSizeY;
int ctbAddrRS = sps->PicWidthInCtbsY*tbY + tbX;
pps->MinTbAddrZS[x + y*sps->PicWidthInTbsY] = pps->CtbAddrRStoTS[ctbAddrRS]
<< ((sps->Log2CtbSizeY-sps->Log2MinTrafoSize)*2);
int p=0;
for (int i=0 ; i<(sps->Log2CtbSizeY - sps->Log2MinTrafoSize) ; i++) {
int m=1<<i;
p += (m & x ? m*m : 0) + (m & y ? 2*m*m : 0);
}
pps->MinTbAddrZS[x + y*sps->PicWidthInTbsY] += p;
}
// --- debug logging ---
/*
logtrace(LogHeaders,"6.5.2 Z-scan order array\n");
for (int y=0;y<sps->PicHeightInTbsY;y++)
{
for (int x=0;x<sps->PicWidthInTbsY;x++)
{
logtrace(LogHeaders,"%4d ", pps->MinTbAddrZS[x + y*sps->PicWidthInTbsY]);
}
logtrace(LogHeaders,"\n");
}
for (int i=0;i<sps->PicSizeInTbsY;i++)
{
for (int y=0;y<sps->PicHeightInTbsY;y++)
{
for (int x=0;x<sps->PicWidthInTbsY;x++)
{
if (pps->MinTbAddrZS[x + y*sps->PicWidthInTbsY] == i) {
logtrace(LogHeaders,"%d %d\n",x,y);
}
}
}
}
*/
// END tiles
pps->Log2MinCuQpDeltaSize = sps->Log2CtbSizeY - pps->diff_cu_qp_delta_depth;
pps->beta_offset = 0; // default value
pps->tc_offset = 0; // default value
pps->pps_loop_filter_across_slices_enabled_flag = get_bits(br,1);
pps->deblocking_filter_control_present_flag = get_bits(br,1);
if (pps->deblocking_filter_control_present_flag) {
pps->deblocking_filter_override_enabled_flag = get_bits(br,1);
pps->pic_disable_deblocking_filter_flag = get_bits(br,1);
if (!pps->pic_disable_deblocking_filter_flag) {
pps->beta_offset = get_svlc(br)*2;
pps->tc_offset = get_svlc(br)*2;
}
}
else {
pps->deblocking_filter_override_enabled_flag = 0;
pps->pic_disable_deblocking_filter_flag = 0;
}
pps->pic_scaling_list_data_present_flag = get_bits(br,1);
if (pps->pic_scaling_list_data_present_flag) {
assert(false);
//scaling_list_data()
}
pps->lists_modification_present_flag = get_bits(br,1);
pps->log2_parallel_merge_level = get_uvlc(br)+2;
pps->slice_segment_header_extension_present_flag = get_bits(br,1);
pps->pps_extension_flag = get_bits(br,1);
if (pps->pps_extension_flag) {
assert(false);
/*
while( more_rbsp_data() )
pps_extension_data_flag
u(1)
rbsp_trailing_bits()
}
*/
}
pps->pps_read = true;
}
/* A ref-pic-set is coded either coded
- as a list of the relative POC deltas themselves, or
- by shifting an existing ref-pic-set by some number of frames
When shifting an existing set, the frame 0 is also shifted as an additional reference frame.
When coding the ref-pic-sets in the SPS, predicition is always from the previous set.
In the slice header, the ref-pic-set can use any previous set as reference.
*/
bool read_short_term_ref_pic_set(decoder_context* ctx,
const seq_parameter_set* sps,
bitreader* br,
ref_pic_set* out_set, // where to store the read set
int idxRps, // index of the set to be read
const ref_pic_set* sets, // previously read sets
bool sliceRefPicSet) // is this in the slice header?
{
// --- is this set coded in prediction mode (not possible for the first set)
char inter_ref_pic_set_prediction_flag;
if (idxRps != 0) {
inter_ref_pic_set_prediction_flag = get_bits(br,1);
}
else {
inter_ref_pic_set_prediction_flag = 0;
}
if (inter_ref_pic_set_prediction_flag) {
int vlc;
/* Only for the last ref_pic_set (that's the one coded in the slice header),
we can specify relative to which reference set we code the set. */
int delta_idx;
if (sliceRefPicSet) { // idxRps == num_short_term_ref_pic_sets) {
delta_idx = vlc = get_uvlc(br);
delta_idx++;
} else {
delta_idx = 1;
}
int RIdx = idxRps - delta_idx; // this is our source set, which we will modify
assert(RIdx>=0);
int delta_rps_sign = get_bits(br,1);
int abs_delta_rps = vlc = get_uvlc(br);
abs_delta_rps++;
int DeltaRPS = (delta_rps_sign ? -abs_delta_rps : abs_delta_rps);
// bits are stored in this order:
// - all bits for negative Pocs (forward),
// - then all bits for positive Pocs (forward),
// - then bits for '0', shifting of the current picture
// in total, these are 'nDeltaPocsRIdx'+1 bits
logtrace(LogHeaders,"predicted from %d with delta %d\n",RIdx,DeltaRPS);
int nDeltaPocsRIdx= sets[RIdx].NumDeltaPocs; // size of source set
char *const used_by_curr_pic_flag = (char *)alloca((nDeltaPocsRIdx+1) * sizeof(char));
char *const use_delta_flag = (char *)alloca((nDeltaPocsRIdx+1) * sizeof(char));
for (int j=0;j<=nDeltaPocsRIdx;j++) {
used_by_curr_pic_flag[j] = get_bits(br,1);
if (used_by_curr_pic_flag[j]) {
use_delta_flag[j] = 1; // if this frame is used, we also have to apply the delta
} else {
use_delta_flag[j] = get_bits(br,1); // otherwise, it is only optionally included
}
}
logtrace(LogHeaders,"flags: ");
for (int j=0;j<=nDeltaPocsRIdx;j++) {
logtrace(LogHeaders,"%d ", use_delta_flag[j]);
}
logtrace(LogHeaders,"\n");
int nNegativeRIdx = sets[RIdx].NumNegativePics;
int nPositiveRIdx = sets[RIdx].NumPositivePics;
// --- update list 0 (negative Poc) ---
// Iterate through all Pocs in decreasing value order (positive reverse, 0, negative forward).
int i=0; // target index
// positive list
for (int j=nPositiveRIdx-1;j>=0;j--) {
int dPoc = sets[RIdx].DeltaPocS1[j] + DeltaRPS; // new delta
if (dPoc<0 && use_delta_flag[nNegativeRIdx+j]) {
out_set->DeltaPocS0[i] = dPoc;
out_set->UsedByCurrPicS0[i] = used_by_curr_pic_flag[nNegativeRIdx+j];
i++;
}
}
// frame 0
if (DeltaRPS<0 && use_delta_flag[nDeltaPocsRIdx]) {
out_set->DeltaPocS0[i] = DeltaRPS;
out_set->UsedByCurrPicS0[i] = used_by_curr_pic_flag[nDeltaPocsRIdx];
i++;
}
// negative list
for (int j=0;j<nNegativeRIdx;j++) {
int dPoc = sets[RIdx].DeltaPocS0[j] + DeltaRPS;
if (dPoc<0 && use_delta_flag[j]) {
out_set->DeltaPocS0[i] = dPoc;
out_set->UsedByCurrPicS0[i] = used_by_curr_pic_flag[j];
i++;
}
}
out_set->NumNegativePics = i;
// --- update list 1 (positive Poc) ---
// Iterate through all Pocs in increasing value order (negative reverse, 0, positive forward)
i=0; // target index
// negative list
for (int j=nNegativeRIdx-1;j>=0;j--) {
int dPoc = sets[RIdx].DeltaPocS0[j] + DeltaRPS;
if (dPoc>0 && use_delta_flag[j]) {
out_set->DeltaPocS1[i] = dPoc;
out_set->UsedByCurrPicS1[i] = used_by_curr_pic_flag[j];
i++;
}
}
// frame 0
if (DeltaRPS>0 && use_delta_flag[nDeltaPocsRIdx]) {
out_set->DeltaPocS1[i] = DeltaRPS;
out_set->UsedByCurrPicS1[i] = used_by_curr_pic_flag[nDeltaPocsRIdx];
i++;
}
// positive list
for (int j=0;j<nPositiveRIdx;j++) {
int dPoc = sets[RIdx].DeltaPocS1[j] + DeltaRPS;
if (dPoc>0 && use_delta_flag[nNegativeRIdx+j]) {
out_set->DeltaPocS1[i] = dPoc;
out_set->UsedByCurrPicS1[i] = used_by_curr_pic_flag[nNegativeRIdx+j];
i++;
}
}
out_set->NumPositivePics = i;
out_set->NumDeltaPocs = out_set->NumNegativePics + out_set->NumPositivePics;
} else {
// --- first, read the number of past and future frames in this set ---
int num_negative_pics = get_uvlc(br);
int num_positive_pics = get_uvlc(br);
// total number of reference pictures may not exceed buffer capacity
if (num_negative_pics + num_positive_pics >
sps->sps_max_dec_pic_buffering[ sps->sps_max_sub_layers-1 ]) {
add_warning(ctx, DE265_WARNING_MAX_NUM_REF_PICS_EXCEEDED, false);
return false;
}
out_set->NumNegativePics = num_negative_pics;
out_set->NumPositivePics = num_positive_pics;
out_set->NumDeltaPocs = num_positive_pics + num_negative_pics;
// --- now, read the deltas between the reference frames to fill the lists ---
// past frames
int lastPocS=0;
for (int i=0;i<num_negative_pics;i++) {
int delta_poc_s0 = get_uvlc(br)+1;
char used_by_curr_pic_s0_flag = get_bits(br,1);
out_set->DeltaPocS0[i] = lastPocS - delta_poc_s0;
out_set->UsedByCurrPicS0[i] = used_by_curr_pic_s0_flag;
lastPocS = out_set->DeltaPocS0[i];
}
// future frames
lastPocS=0;
for (int i=0;i<num_positive_pics;i++) {
int delta_poc_s1 = get_uvlc(br)+1;
char used_by_curr_pic_s1_flag = get_bits(br,1);
out_set->DeltaPocS1[i] = lastPocS + delta_poc_s1;
out_set->UsedByCurrPicS1[i] = used_by_curr_pic_s1_flag;
lastPocS = out_set->DeltaPocS1[i];
}
}
compute_NumPoc(out_set);
return true;
}
