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slice.cc
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/*
* H.265 video codec.
* Copyright (c) 2013-2014 struktur AG, Dirk Farin <[email protected]>
*
* Authors: struktur AG, Dirk Farin <[email protected]>
* Min Chen <[email protected]>
*
* This file is part of libde265.
*
* libde265 is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* libde265 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libde265. If not, see <http://www.gnu.org/licenses/>.
*/
#include "slice.h"
#include "motion.h"
#include "util.h"
#include "scan.h"
#include "intrapred.h"
#include "transform.h"
#include "threads.h"
#include "image.h"
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#define LOCK de265_mutex_lock(&ctx->thread_pool.mutex)
#define UNLOCK de265_mutex_unlock(&ctx->thread_pool.mutex)
extern bool read_short_term_ref_pic_set(error_queue* errqueue,
const seq_parameter_set* sps,
bitreader* br,
ref_pic_set* out_set,
int idxRps, // index of the set to be read
const std::vector<ref_pic_set>& sets,
bool sliceRefPicSet);
void read_coding_tree_unit(thread_context* tctx);
void read_coding_quadtree(thread_context* tctx,
int xCtb, int yCtb,
int Log2CtbSizeY,
int ctDepth);
/*
void decode_inter_block(decoder_context* ctx,thread_context* tctx,
int xC, int yC, int log2CbSize);
*/
void slice_segment_header::set_defaults()
{
slice_index = 0;
first_slice_segment_in_pic_flag = 1;
no_output_of_prior_pics_flag = 0;
slice_pic_parameter_set_id = 0;
dependent_slice_segment_flag = 0;
slice_segment_address = 0;
slice_type = SLICE_TYPE_I;
pic_output_flag = 1;
colour_plane_id = 0;
slice_pic_order_cnt_lsb = 0;
short_term_ref_pic_set_sps_flag = 1;
// ref_pic_set slice_ref_pic_set;
short_term_ref_pic_set_idx = 0;
num_long_term_sps = 0;
num_long_term_pics = 0;
//uint8_t lt_idx_sps[MAX_NUM_REF_PICS];
//int poc_lsb_lt[MAX_NUM_REF_PICS];
//char used_by_curr_pic_lt_flag[MAX_NUM_REF_PICS];
//char delta_poc_msb_present_flag[MAX_NUM_REF_PICS];
//int delta_poc_msb_cycle_lt[MAX_NUM_REF_PICS];
slice_temporal_mvp_enabled_flag = 0;
slice_sao_luma_flag = 0;
slice_sao_chroma_flag = 0;
num_ref_idx_active_override_flag = 0;
num_ref_idx_l0_active=1; // [1;16]
num_ref_idx_l1_active=1; // [1;16]
ref_pic_list_modification_flag_l0 = 0;
ref_pic_list_modification_flag_l1 = 0;
//uint8_t list_entry_l0[16];
//uint8_t list_entry_l1[16];
mvd_l1_zero_flag = 0;
cabac_init_flag = 0;
collocated_from_l0_flag = 0;
collocated_ref_idx = 0;
// --- pred_weight_table ---
luma_log2_weight_denom=0; // [0;7]
ChromaLog2WeightDenom=0; // [0;7]
// first index is L0/L1
/*
uint8_t luma_weight_flag[2][16]; // bool
uint8_t chroma_weight_flag[2][16]; // bool
int16_t LumaWeight[2][16];
int8_t luma_offset[2][16];
int16_t ChromaWeight[2][16][2];
int8_t ChromaOffset[2][16][2];
*/
five_minus_max_num_merge_cand = 0;
slice_qp_delta = 0;
slice_cb_qp_offset = 0;
slice_cr_qp_offset = 0;
cu_chroma_qp_offset_enabled_flag = 0;
deblocking_filter_override_flag = 0;
slice_deblocking_filter_disabled_flag = 0;
slice_beta_offset=0; // = pps->beta_offset if undefined
slice_tc_offset=0; // = pps->tc_offset if undefined
slice_loop_filter_across_slices_enabled_flag = 0;
num_entry_point_offsets = 0;
//int offset_len;
//std::vector<int> entry_point_offset;
slice_segment_header_extension_length = 0;
SliceAddrRS = slice_segment_address;
}
bool read_pred_weight_table(bitreader* br, slice_segment_header* shdr, decoder_context* ctx)
{
int vlc;
pic_parameter_set* pps = ctx->get_pps((int)shdr->slice_pic_parameter_set_id);
assert(pps);
seq_parameter_set* sps = ctx->get_sps((int)pps->seq_parameter_set_id);
assert(sps);
shdr->luma_log2_weight_denom = vlc = get_uvlc(br);
if (vlc<0 || vlc>7) return false;
if (sps->chroma_format_idc != 0) {
vlc = get_svlc(br);
vlc += shdr->luma_log2_weight_denom;
if (vlc<0 || vlc>7) return false;
shdr->ChromaLog2WeightDenom = vlc;
}
int sumWeightFlags = 0;
for (int l=0;l<=1;l++)
if (l==0 || (l==1 && shdr->slice_type == SLICE_TYPE_B))
{
int num_ref = (l==0 ? shdr->num_ref_idx_l0_active-1 : shdr->num_ref_idx_l1_active-1);
for (int i=0;i<=num_ref;i++) {
shdr->luma_weight_flag[l][i] = get_bits(br,1);
if (shdr->luma_weight_flag[l][i]) sumWeightFlags++;
}
if (sps->chroma_format_idc != 0) {
for (int i=0;i<=num_ref;i++) {
shdr->chroma_weight_flag[l][i] = get_bits(br,1);
if (shdr->chroma_weight_flag[l][i]) sumWeightFlags+=2;
}
}
for (int i=0;i<=num_ref;i++) {
if (shdr->luma_weight_flag[l][i]) {
// delta_luma_weight
vlc = get_svlc(br);
if (vlc < -128 || vlc > 127) return false;
shdr->LumaWeight[l][i] = (1<<shdr->luma_log2_weight_denom) + vlc;
// luma_offset
vlc = get_svlc(br);
if (vlc < -sps->WpOffsetHalfRangeY || vlc > sps->WpOffsetHalfRangeY-1) return false;
shdr->luma_offset[l][i] = vlc;
}
else {
shdr->LumaWeight[l][i] = 1<<shdr->luma_log2_weight_denom;
shdr->luma_offset[l][i] = 0;
}
if (shdr->chroma_weight_flag[l][i])
for (int j=0;j<2;j++) {
// delta_chroma_weight
vlc = get_svlc(br);
if (vlc < -128 || vlc > 127) return false;
shdr->ChromaWeight[l][i][j] = (1<<shdr->ChromaLog2WeightDenom) + vlc;
// delta_chroma_offset
vlc = get_svlc(br);
if (vlc < -4*sps->WpOffsetHalfRangeC ||
vlc > 4*sps->WpOffsetHalfRangeC-1) return false;
vlc = Clip3(-sps->WpOffsetHalfRangeC,
sps->WpOffsetHalfRangeC-1,
(sps->WpOffsetHalfRangeC
+vlc
-((sps->WpOffsetHalfRangeC*shdr->ChromaWeight[l][i][j])
>> shdr->ChromaLog2WeightDenom)));
shdr->ChromaOffset[l][i][j] = vlc;
}
else {
for (int j=0;j<2;j++) {
shdr->ChromaWeight[l][i][j] = 1<<shdr->ChromaLog2WeightDenom;
shdr->ChromaOffset[l][i][j] = 0;
}
}
}
}
// TODO: bitstream conformance requires that 'sumWeightFlags<=24'
return true;
}
void slice_segment_header::reset()
{
pps = NULL;
slice_index = 0;
first_slice_segment_in_pic_flag = 0;
no_output_of_prior_pics_flag = 0;
slice_pic_parameter_set_id = 0;
dependent_slice_segment_flag = 0;
slice_segment_address = 0;
slice_type = 0;
pic_output_flag = 0;
colour_plane_id = 0;
slice_pic_order_cnt_lsb = 0;
short_term_ref_pic_set_sps_flag = 0;
slice_ref_pic_set.reset();
short_term_ref_pic_set_idx = 0;
num_long_term_sps = 0;
num_long_term_pics= 0;
for (int i=0;i<MAX_NUM_REF_PICS;i++) {
lt_idx_sps[i] = 0;
poc_lsb_lt[i] = 0;
used_by_curr_pic_lt_flag[i] = 0;
delta_poc_msb_present_flag[i] = 0;
delta_poc_msb_cycle_lt[i] = 0;
}
slice_temporal_mvp_enabled_flag = 0;
slice_sao_luma_flag = 0;
slice_sao_chroma_flag = 0;
num_ref_idx_active_override_flag = 0;
num_ref_idx_l0_active = 0;
num_ref_idx_l1_active = 0;
ref_pic_list_modification_flag_l0 = 0;
ref_pic_list_modification_flag_l1 = 0;
for (int i=0;i<16;i++) {
list_entry_l0[i] = 0;
list_entry_l1[i] = 0;
}
mvd_l1_zero_flag = 0;
cabac_init_flag = 0;
collocated_from_l0_flag = 0;
collocated_ref_idx = 0;
luma_log2_weight_denom = 0;
ChromaLog2WeightDenom = 0;
for (int i=0;i<2;i++)
for (int j=0;j<16;j++) {
luma_weight_flag[i][j] = 0;
chroma_weight_flag[i][j] = 0;
LumaWeight[i][j] = 0;
luma_offset[i][j] = 0;
ChromaWeight[i][j][0] = ChromaWeight[i][j][1] = 0;
ChromaOffset[i][j][0] = ChromaOffset[i][j][1] = 0;
}
five_minus_max_num_merge_cand = 0;
slice_qp_delta = 0;
slice_cb_qp_offset = 0;
slice_cr_qp_offset = 0;
cu_chroma_qp_offset_enabled_flag = 0;
deblocking_filter_override_flag = 0;
slice_deblocking_filter_disabled_flag = 0;
slice_beta_offset = 0;
slice_tc_offset = 0;
slice_loop_filter_across_slices_enabled_flag = 0;
num_entry_point_offsets = 0;
offset_len = 0;
entry_point_offset.clear();
slice_segment_header_extension_length = 0;
SliceAddrRS = 0;
SliceQPY = 0;
initType = 0;
MaxNumMergeCand = 0;
CurrRpsIdx = 0;
CurrRps.reset();
NumPocTotalCurr = 0;
for (int i=0;i<2;i++)
for (int j=0;j<MAX_NUM_REF_PICS;j++) {
RefPicList[i][j] = 0;
RefPicList_POC[i][j] = 0;
RefPicList_PicState[i][j] = 0;
LongTermRefPic[i][j] = 0;
}
//context_model ctx_model_storage[CONTEXT_MODEL_TABLE_LENGTH];
RemoveReferencesList.clear();
ctx_model_storage_defined = false;
}
de265_error slice_segment_header::read(bitreader* br, decoder_context* ctx,
bool* continueDecoding)
{
*continueDecoding = false;
reset();
// set defaults
dependent_slice_segment_flag = 0;
// read bitstream
first_slice_segment_in_pic_flag = get_bits(br,1);
if (ctx->get_RapPicFlag()) { // TODO: is this still correct ? Should we drop RapPicFlag ?
no_output_of_prior_pics_flag = get_bits(br,1);
}
slice_pic_parameter_set_id = get_uvlc(br);
if (slice_pic_parameter_set_id > DE265_MAX_PPS_SETS ||
slice_pic_parameter_set_id == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_NONEXISTING_PPS_REFERENCED, false);
return DE265_OK;
}
if (!ctx->has_pps(slice_pic_parameter_set_id)) {
ctx->add_warning(DE265_WARNING_NONEXISTING_PPS_REFERENCED, false);
return DE265_OK;
}
pps = ctx->get_shared_pps(slice_pic_parameter_set_id);
const seq_parameter_set* sps = pps->sps.get();
if (!sps->sps_read) {
ctx->add_warning(DE265_WARNING_NONEXISTING_SPS_REFERENCED, false);
*continueDecoding = false;
return DE265_OK;
}
if (!first_slice_segment_in_pic_flag) {
if (pps->dependent_slice_segments_enabled_flag) {
dependent_slice_segment_flag = get_bits(br,1);
} else {
dependent_slice_segment_flag = 0;
}
int slice_segment_address = get_bits(br, ceil_log2(sps->PicSizeInCtbsY));
if (dependent_slice_segment_flag) {
if (slice_segment_address == 0) {
*continueDecoding = false;
ctx->add_warning(DE265_WARNING_DEPENDENT_SLICE_WITH_ADDRESS_ZERO, false);
return DE265_OK;
}
if (ctx->previous_slice_header == NULL) {
return DE265_ERROR_NO_INITIAL_SLICE_HEADER;
}
*this = *ctx->previous_slice_header;
first_slice_segment_in_pic_flag = 0;
dependent_slice_segment_flag = 1;
}
this->slice_segment_address = slice_segment_address;
} else {
dependent_slice_segment_flag = 0;
slice_segment_address = 0;
}
if (slice_segment_address < 0 ||
slice_segment_address >= sps->PicSizeInCtbsY) {
ctx->add_warning(DE265_WARNING_SLICE_SEGMENT_ADDRESS_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
//printf("SLICE %d (%d)\n",slice_segment_address, sps->PicSizeInCtbsY);
if (!dependent_slice_segment_flag) {
for (int i=0; i<pps->num_extra_slice_header_bits; i++) {
//slice_reserved_undetermined_flag[i]
skip_bits(br,1);
}
slice_type = get_uvlc(br);
if (slice_type > 2 ||
slice_type == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
*continueDecoding = false;
return DE265_OK;
}
if (pps->output_flag_present_flag) {
pic_output_flag = get_bits(br,1);
}
else {
pic_output_flag = 1;
}
if (sps->separate_colour_plane_flag == 1) {
colour_plane_id = get_bits(br,2);
}
slice_pic_order_cnt_lsb = 0;
short_term_ref_pic_set_sps_flag = 0;
int NumLtPics = 0;
if (ctx->get_nal_unit_type() != NAL_UNIT_IDR_W_RADL &&
ctx->get_nal_unit_type() != NAL_UNIT_IDR_N_LP) {
slice_pic_order_cnt_lsb = get_bits(br, sps->log2_max_pic_order_cnt_lsb);
short_term_ref_pic_set_sps_flag = get_bits(br,1);
if (!short_term_ref_pic_set_sps_flag) {
read_short_term_ref_pic_set(ctx, sps,
br, &slice_ref_pic_set,
sps->num_short_term_ref_pic_sets(),
sps->ref_pic_sets,
true);
CurrRpsIdx = sps->num_short_term_ref_pic_sets();
CurrRps = slice_ref_pic_set;
}
else {
int nBits = ceil_log2(sps->num_short_term_ref_pic_sets());
if (nBits>0) short_term_ref_pic_set_idx = get_bits(br,nBits);
else short_term_ref_pic_set_idx = 0;
if (short_term_ref_pic_set_idx >= sps->num_short_term_ref_pic_sets()) {
ctx->add_warning(DE265_WARNING_SHORT_TERM_REF_PIC_SET_OUT_OF_RANGE, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
CurrRpsIdx = short_term_ref_pic_set_idx;
CurrRps = sps->ref_pic_sets[CurrRpsIdx];
}
// --- long-term MC ---
if (sps->long_term_ref_pics_present_flag) {
if (sps->num_long_term_ref_pics_sps > 0) {
num_long_term_sps = get_uvlc(br);
if (num_long_term_sps == UVLC_ERROR) {
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
else {
num_long_term_sps = 0;
}
num_long_term_pics= get_uvlc(br);
if (num_long_term_pics == UVLC_ERROR) {
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
// check maximum number of reference frames
if (num_long_term_sps +
num_long_term_pics +
CurrRps.NumNegativePics +
CurrRps.NumPositivePics
> sps->sps_max_dec_pic_buffering[sps->sps_max_sub_layers-1])
{
ctx->add_warning(DE265_WARNING_MAX_NUM_REF_PICS_EXCEEDED, false);
*continueDecoding = false;
return DE265_OK;
}
for (int i=0; i<num_long_term_sps + num_long_term_pics; i++) {
if (i < num_long_term_sps) {
int nBits = ceil_log2(sps->num_long_term_ref_pics_sps);
lt_idx_sps[i] = get_bits(br, nBits);
// check that the referenced lt-reference really exists
if (lt_idx_sps[i] >= sps->num_long_term_ref_pics_sps) {
ctx->add_warning(DE265_NON_EXISTING_LT_REFERENCE_CANDIDATE_IN_SLICE_HEADER, false);
*continueDecoding = false;
return DE265_OK;
}
// delta_poc_msb_present_flag[i] = 0; // TODO ?
ctx->PocLsbLt[i] = sps->lt_ref_pic_poc_lsb_sps[ lt_idx_sps[i] ];
ctx->UsedByCurrPicLt[i] = sps->used_by_curr_pic_lt_sps_flag[ lt_idx_sps[i] ];
}
else {
int nBits = sps->log2_max_pic_order_cnt_lsb;
poc_lsb_lt[i] = get_bits(br, nBits);
used_by_curr_pic_lt_flag[i] = get_bits(br,1);
ctx->PocLsbLt[i] = poc_lsb_lt[i];
ctx->UsedByCurrPicLt[i] = used_by_curr_pic_lt_flag[i];
}
if (ctx->UsedByCurrPicLt[i]) {
NumLtPics++;
}
delta_poc_msb_present_flag[i] = get_bits(br,1);
if (delta_poc_msb_present_flag[i]) {
delta_poc_msb_cycle_lt[i] = get_uvlc(br);
if (delta_poc_msb_cycle_lt[i]==UVLC_ERROR) {
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
else {
delta_poc_msb_cycle_lt[i] = 0;
}
if (i==0 || i==num_long_term_sps) {
ctx->DeltaPocMsbCycleLt[i] = delta_poc_msb_cycle_lt[i];
}
else {
ctx->DeltaPocMsbCycleLt[i] = (delta_poc_msb_cycle_lt[i] +
ctx->DeltaPocMsbCycleLt[i-1]);
}
}
}
else {
num_long_term_sps = 0;
num_long_term_pics= 0;
}
if (sps->sps_temporal_mvp_enabled_flag) {
slice_temporal_mvp_enabled_flag = get_bits(br,1);
}
else {
slice_temporal_mvp_enabled_flag = 0;
}
}
else {
slice_pic_order_cnt_lsb = 0;
num_long_term_sps = 0;
num_long_term_pics= 0;
}
// --- SAO ---
if (sps->sample_adaptive_offset_enabled_flag) {
slice_sao_luma_flag = get_bits(br,1);
if (sps->ChromaArrayType != CHROMA_MONO) {
slice_sao_chroma_flag = get_bits(br,1);
}
else {
slice_sao_chroma_flag = 0;
}
}
else {
slice_sao_luma_flag = 0;
slice_sao_chroma_flag = 0;
}
num_ref_idx_l0_active = 0;
num_ref_idx_l1_active = 0;
if (slice_type == SLICE_TYPE_P ||
slice_type == SLICE_TYPE_B) {
num_ref_idx_active_override_flag = get_bits(br,1);
if (num_ref_idx_active_override_flag) {
num_ref_idx_l0_active = get_uvlc(br);
if (num_ref_idx_l0_active == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
num_ref_idx_l0_active++;;
if (slice_type == SLICE_TYPE_B) {
num_ref_idx_l1_active = get_uvlc(br);
if (num_ref_idx_l1_active == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
num_ref_idx_l1_active++;
}
}
else {
num_ref_idx_l0_active = pps->num_ref_idx_l0_default_active;
num_ref_idx_l1_active = pps->num_ref_idx_l1_default_active;
}
if (num_ref_idx_l0_active > 16) { return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE; }
if (num_ref_idx_l1_active > 16) { return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE; }
NumPocTotalCurr = CurrRps.NumPocTotalCurr_shortterm_only + NumLtPics;
if (pps->lists_modification_present_flag && NumPocTotalCurr > 1) {
int nBits = ceil_log2(NumPocTotalCurr);
ref_pic_list_modification_flag_l0 = get_bits(br,1);
if (ref_pic_list_modification_flag_l0) {
for (int i=0;i<num_ref_idx_l0_active;i++) {
list_entry_l0[i] = get_bits(br, nBits);
}
}
if (slice_type == SLICE_TYPE_B) {
ref_pic_list_modification_flag_l1 = get_bits(br,1);
if (ref_pic_list_modification_flag_l1) {
for (int i=0;i<num_ref_idx_l1_active;i++) {
list_entry_l1[i] = get_bits(br, nBits);
}
}
}
else {
ref_pic_list_modification_flag_l1 = 0;
}
}
else {
ref_pic_list_modification_flag_l0 = 0;
ref_pic_list_modification_flag_l1 = 0;
}
if (slice_type == SLICE_TYPE_B) {
mvd_l1_zero_flag = get_bits(br,1);
}
if (pps->cabac_init_present_flag) {
cabac_init_flag = get_bits(br,1);
}
else {
cabac_init_flag = 0;
}
if (slice_temporal_mvp_enabled_flag) {
if (slice_type == SLICE_TYPE_B)
collocated_from_l0_flag = get_bits(br,1);
else
collocated_from_l0_flag = 1;
if (( collocated_from_l0_flag && num_ref_idx_l0_active > 1) ||
(!collocated_from_l0_flag && num_ref_idx_l1_active > 1)) {
collocated_ref_idx = get_uvlc(br);
if (collocated_ref_idx == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
else {
collocated_ref_idx = 0;
}
// check whether collocated_ref_idx points to a valid index
if (( collocated_from_l0_flag && collocated_ref_idx >= num_ref_idx_l0_active) ||
(!collocated_from_l0_flag && collocated_ref_idx >= num_ref_idx_l1_active)) {
ctx->add_warning(DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
if ((pps->weighted_pred_flag && slice_type == SLICE_TYPE_P) ||
(pps->weighted_bipred_flag && slice_type == SLICE_TYPE_B)) {
if (!read_pred_weight_table(br,this,ctx))
{
ctx->add_warning(DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
five_minus_max_num_merge_cand = get_uvlc(br);
if (five_minus_max_num_merge_cand == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
MaxNumMergeCand = 5-five_minus_max_num_merge_cand;
}
slice_qp_delta = get_svlc(br);
if (slice_qp_delta == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
//logtrace(LogSlice,"slice_qp_delta: %d\n",shdr->slice_qp_delta);
if (pps->pps_slice_chroma_qp_offsets_present_flag) {
slice_cb_qp_offset = get_svlc(br);
if (slice_cb_qp_offset == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
slice_cr_qp_offset = get_svlc(br);
if (slice_cr_qp_offset == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
else {
slice_cb_qp_offset = 0;
slice_cr_qp_offset = 0;
}
if (pps->range_extension.chroma_qp_offset_list_enabled_flag) {
cu_chroma_qp_offset_enabled_flag = get_bits(br,1);
}
if (pps->deblocking_filter_override_enabled_flag) {
deblocking_filter_override_flag = get_bits(br,1);
}
else {
deblocking_filter_override_flag = 0;
}
slice_beta_offset = pps->beta_offset;
slice_tc_offset = pps->tc_offset;
if (deblocking_filter_override_flag) {
slice_deblocking_filter_disabled_flag = get_bits(br,1);
if (!slice_deblocking_filter_disabled_flag) {
slice_beta_offset = get_svlc(br);
if (slice_beta_offset == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
slice_beta_offset *= 2;
slice_tc_offset = get_svlc(br);
if (slice_tc_offset == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
slice_tc_offset *= 2;
}
}
else {
slice_deblocking_filter_disabled_flag = pps->pic_disable_deblocking_filter_flag;
}
if (pps->pps_loop_filter_across_slices_enabled_flag &&
(slice_sao_luma_flag || slice_sao_chroma_flag ||
!slice_deblocking_filter_disabled_flag )) {
slice_loop_filter_across_slices_enabled_flag = get_bits(br,1);
}
else {
slice_loop_filter_across_slices_enabled_flag =
pps->pps_loop_filter_across_slices_enabled_flag;
}
}
if (pps->tiles_enabled_flag || pps->entropy_coding_sync_enabled_flag ) {
num_entry_point_offsets = get_uvlc(br);
if (num_entry_point_offsets == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
if (pps->entropy_coding_sync_enabled_flag) {
// check num_entry_points for valid range
int firstCTBRow = slice_segment_address / sps->PicWidthInCtbsY;
int lastCTBRow = firstCTBRow + num_entry_point_offsets;
if (lastCTBRow >= sps->PicHeightInCtbsY) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
if (pps->tiles_enabled_flag) {
if (num_entry_point_offsets > pps->num_tile_columns * pps->num_tile_rows) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
}
entry_point_offset.resize( num_entry_point_offsets );
if (num_entry_point_offsets > 0) {
offset_len = get_uvlc(br);
if (offset_len == UVLC_ERROR) {
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
offset_len++;
if (offset_len > 32) {
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
for (int i=0; i<num_entry_point_offsets; i++) {
{
entry_point_offset[i] = get_bits(br,offset_len)+1;
}
if (i>0) {
entry_point_offset[i] += entry_point_offset[i-1];
}
}
}
}
else {
num_entry_point_offsets = 0;
}
if (pps->slice_segment_header_extension_present_flag) {
slice_segment_header_extension_length = get_uvlc(br);
if (slice_segment_header_extension_length == UVLC_ERROR ||
slice_segment_header_extension_length > 1000) { // TODO: safety check against too large values
ctx->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
for (int i=0; i<slice_segment_header_extension_length; i++) {
//slice_segment_header_extension_data_byte[i]
get_bits(br,8);
}
}
compute_derived_values(pps.get());
*continueDecoding = true;
return DE265_OK;
}
de265_error slice_segment_header::write(error_queue* errqueue, CABAC_encoder& out,
const seq_parameter_set* sps,
const pic_parameter_set* pps,
uint8_t nal_unit_type)
{
out.write_bit(first_slice_segment_in_pic_flag);
if (isRapPic(nal_unit_type)) { // TODO: is this still correct ? Should we drop RapPicFlag ?
out.write_bit(no_output_of_prior_pics_flag);
}
if (slice_pic_parameter_set_id > DE265_MAX_PPS_SETS) {
errqueue->add_warning(DE265_WARNING_NONEXISTING_PPS_REFERENCED, false);
return DE265_OK;
}
out.write_uvlc(slice_pic_parameter_set_id);
if (!first_slice_segment_in_pic_flag) {
if (pps->dependent_slice_segments_enabled_flag) {
out.write_bit(dependent_slice_segment_flag);
}
out.write_bits(slice_segment_address, ceil_log2(sps->PicSizeInCtbsY));
if (dependent_slice_segment_flag) {
if (slice_segment_address == 0) {
errqueue->add_warning(DE265_WARNING_DEPENDENT_SLICE_WITH_ADDRESS_ZERO, false);
return DE265_OK;
}
}
}
if (slice_segment_address < 0 ||
slice_segment_address > sps->PicSizeInCtbsY) {
errqueue->add_warning(DE265_WARNING_SLICE_SEGMENT_ADDRESS_INVALID, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
if (!dependent_slice_segment_flag) {
for (int i=0; i<pps->num_extra_slice_header_bits; i++) {
//slice_reserved_undetermined_flag[i]
out.skip_bits(1);
}
if (slice_type > 2) {
errqueue->add_warning(DE265_WARNING_SLICEHEADER_INVALID, false);
return DE265_OK;
}
out.write_uvlc(slice_type);
if (pps->output_flag_present_flag) {
out.write_bit(pic_output_flag);
}
if (sps->separate_colour_plane_flag == 1) {
out.write_bits(colour_plane_id,2);
}
int NumLtPics = 0;
if (nal_unit_type != NAL_UNIT_IDR_W_RADL &&
nal_unit_type != NAL_UNIT_IDR_N_LP) {
out.write_bits(slice_pic_order_cnt_lsb, sps->log2_max_pic_order_cnt_lsb);
out.write_bit(short_term_ref_pic_set_sps_flag);
if (!short_term_ref_pic_set_sps_flag) {
/* TODO
read_short_term_ref_pic_set(ctx, sps,
br, &slice_ref_pic_set,
sps->num_short_term_ref_pic_sets,
sps->ref_pic_sets,
true);
*/
//CurrRpsIdx = sps->num_short_term_ref_pic_sets;
//CurrRps = slice_ref_pic_set;
}
else {
int nBits = ceil_log2(sps->num_short_term_ref_pic_sets());
if (nBits>0) out.write_bits(short_term_ref_pic_set_idx,nBits);
else { assert(short_term_ref_pic_set_idx==0); }
if (short_term_ref_pic_set_idx > sps->num_short_term_ref_pic_sets()) {
errqueue->add_warning(DE265_WARNING_SHORT_TERM_REF_PIC_SET_OUT_OF_RANGE, false);
return DE265_ERROR_CODED_PARAMETER_OUT_OF_RANGE;
}
//CurrRpsIdx = short_term_ref_pic_set_idx;
//CurrRps = sps->ref_pic_sets[CurrRpsIdx];
}
// --- long-term MC ---
if (sps->long_term_ref_pics_present_flag) {
if (sps->num_long_term_ref_pics_sps > 0) {
out.write_uvlc(num_long_term_sps);
}
else {
assert(num_long_term_sps == 0);
}
out.write_uvlc(num_long_term_pics);
// check maximum number of reference frames
if (num_long_term_sps +
num_long_term_pics +
CurrRps.NumNegativePics +
CurrRps.NumPositivePics
> sps->sps_max_dec_pic_buffering[sps->sps_max_sub_layers-1])
{
errqueue->add_warning(DE265_WARNING_MAX_NUM_REF_PICS_EXCEEDED, false);
return DE265_OK;
}