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contextmodel.cc
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contextmodel.cc
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/*
* H.265 video codec.
* Copyright (c) 2013-2014 struktur AG, Dirk Farin <[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 <assert.h>
#include <iomanip>
#include <sstream>
bool D = false;
context_model_table::context_model_table()
: model(NULL), refcnt(NULL)
{
}
context_model_table::context_model_table(const context_model_table& src)
{
if (D) printf("%p c'tor = %p\n",this,&src);
if (src.refcnt) {
(*(src.refcnt))++;
}
refcnt = src.refcnt;
model = src.model;
}
context_model_table::~context_model_table()
{
if (D) printf("%p destructor\n",this);
if (refcnt) {
(*refcnt)--;
if (*refcnt==0) {
if (D) printf("mfree %p\n",model);
delete[] model;
delete refcnt;
}
}
}
void context_model_table::init(int initType, int QPY)
{
if (D) printf("%p init\n",this);
decouple_or_alloc_with_empty_data();
initialize_CABAC_models(model, initType, QPY);
}
void context_model_table::release()
{
if (D) printf("%p release %p\n",this,refcnt);
if (!refcnt) { return; }
// if (*refcnt == 1) { return; } <- keep memory for later, but does not work when we believe that we freed the memory and nulled all references
(*refcnt)--;
if (*refcnt==0) {
delete[] model;
delete refcnt;
}
model = nullptr;
refcnt= nullptr;
}
void context_model_table::decouple()
{
if (D) printf("%p decouple (%p)\n",this,refcnt);
assert(refcnt); // not necessarily so, but we never use it on an unitialized object
if (*refcnt > 1) {
(*refcnt)--;
context_model* oldModel = model;
model = new context_model[CONTEXT_MODEL_TABLE_LENGTH];
refcnt= new int;
*refcnt=1;
memcpy(model,oldModel,sizeof(context_model)*CONTEXT_MODEL_TABLE_LENGTH);
}
}
context_model_table context_model_table::transfer()
{
context_model_table newtable;
newtable.model = model;
newtable.refcnt= refcnt;
model =nullptr;
refcnt=nullptr;
return newtable;
}
context_model_table& context_model_table::operator=(const context_model_table& src)
{
if (D) printf("%p assign = %p\n",this,&src);
// assert(src.refcnt); // not necessarily so, but we never use it on an unitialized object
if (!src.refcnt) {
release();
return *this;
}
(*(src.refcnt))++;
release();
model = src.model;
refcnt= src.refcnt;
return *this;
}
bool context_model_table::operator==(const context_model_table& b) const
{
if (b.model == model) return true;
if (b.model == nullptr || model == nullptr) return false;
for (int i=0;i<CONTEXT_MODEL_TABLE_LENGTH;i++) {
if (!(b.model[i] == model[i])) return false;
}
return true;
}
std::string context_model_table::debug_dump() const
{
int hash = 0;
for (int i=0;i<CONTEXT_MODEL_TABLE_LENGTH;i++) {
hash ^= ((i+7)*model[i].state) & 0xFFFF;
}
std::stringstream sstr;
sstr << std::hex << hash;
return sstr.str();
}
void context_model_table::decouple_or_alloc_with_empty_data()
{
if (refcnt && *refcnt==1) { return; }
if (refcnt) {
assert(*refcnt>1);
(*refcnt)--;
}
if (D) printf("%p (alloc)\n",this);
model = new context_model[CONTEXT_MODEL_TABLE_LENGTH];
refcnt= new int;
*refcnt=1;
}
static void set_initValue(int SliceQPY,
context_model* model, int initValue, int nContexts)
{
int slopeIdx = initValue >> 4;
int intersecIdx = initValue & 0xF;
int m = slopeIdx*5 - 45;
int n = (intersecIdx<<3) - 16;
int preCtxState = Clip3(1,126, ((m*Clip3(0,51, SliceQPY))>>4)+n);
// logtrace(LogSlice,"QP=%d slopeIdx=%d intersecIdx=%d m=%d n=%d\n",SliceQPY,slopeIdx,intersecIdx,m,n);
for (int i=0;i<nContexts;i++) {
model[i].MPSbit=(preCtxState<=63) ? 0 : 1;
model[i].state = model[i].MPSbit ? (preCtxState-64) : (63-preCtxState);
// model state will always be between [0;62]
assert(model[i].state <= 62);
}
}
static const int initValue_split_cu_flag[3][3] = {
{ 139,141,157 },
{ 107,139,126 },
{ 107,139,126 },
};
static const int initValue_cu_skip_flag[2][3] = {
{ 197,185,201 },
{ 197,185,201 },
};
static const int initValue_part_mode[9] = { 184,154,139, 154,154,154, 139,154,154 };
static const int initValue_prev_intra_luma_pred_flag[3] = { 184,154,183 };
static const int initValue_intra_chroma_pred_mode[3] = { 63,152,152 };
static const int initValue_cbf_luma[4] = { 111,141,153,111 };
static const int initValue_cbf_chroma[12] = { 94,138,182,154,149,107,167,154,149,92,167,154 };
static const int initValue_split_transform_flag[9] = { 153,138,138, 124,138,94, 224,167,122 }; // FIX712
static const int initValue_last_significant_coefficient_prefix[54] = {
110,110,124,125,140,153,125,127,140,109,111,143,127,111, 79,108,123, 63,
125,110, 94,110, 95, 79,125,111,110, 78,110,111,111, 95, 94,108,123,108,
125,110,124,110, 95, 94,125,111,111, 79,125,126,111,111, 79,108,123, 93
};
static const int initValue_coded_sub_block_flag[12] = { 91,171,134,141,121,140,61,154,121,140,61,154 };
static const int initValue_significant_coeff_flag[3][42] = {
{
111, 111, 125, 110, 110, 94, 124, 108, 124, 107, 125, 141, 179, 153, 125, 107,
125, 141, 179, 153, 125, 107, 125, 141, 179, 153, 125, 140, 139, 182, 182, 152,
136, 152, 136, 153, 136, 139, 111, 136, 139, 111
},
{
155, 154, 139, 153, 139, 123, 123, 63, 153, 166, 183, 140, 136, 153, 154, 166,
183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170, 153, 123, 123, 107,
121, 107, 121, 167, 151, 183, 140, 151, 183, 140,
},
{
170, 154, 139, 153, 139, 123, 123, 63, 124, 166, 183, 140, 136, 153, 154, 166,
183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170, 153, 138, 138, 122,
121, 122, 121, 167, 151, 183, 140, 151, 183, 140
},
};
static const int initValue_significant_coeff_flag_skipmode[3][2] = {
{ 141,111 }, { 140,140 }, { 140,140 }
};
static const int initValue_coeff_abs_level_greater1_flag[72] = {
140, 92,137,138,140,152,138,139,153, 74,149, 92,139,107,122,152,
140,179,166,182,140,227,122,197,154,196,196,167,154,152,167,182,
182,134,149,136,153,121,136,137,169,194,166,167,154,167,137,182,
154,196,167,167,154,152,167,182,182,134,149,136,153,121,136,122,
169,208,166,167,154,152,167,182
};
static const int initValue_coeff_abs_level_greater2_flag[18] = {
138,153,136,167,152,152,107,167, 91,122,107,167,
107,167, 91,107,107,167
};
static const int initValue_sao_merge_leftUp_flag[3] = { 153,153,153 };
static const int initValue_sao_type_idx_lumaChroma_flag[3] = { 200,185,160 };
static const int initValue_cu_qp_delta_abs[2] = { 154,154 };
static const int initValue_transform_skip_flag[2] = { 139,139 };
static const int initValue_merge_flag[2] = { 110,154 };
static const int initValue_merge_idx[2] = { 122,137 };
static const int initValue_pred_mode_flag[2] = { 149,134 };
static const int initValue_abs_mvd_greater01_flag[4] = { 140,198,169,198 };
static const int initValue_mvp_lx_flag[1] = { 168 };
static const int initValue_rqt_root_cbf[1] = { 79 };
static const int initValue_ref_idx_lX[2] = { 153,153 };
static const int initValue_inter_pred_idc[5] = { 95,79,63,31,31 };
static const int initValue_cu_transquant_bypass_flag[3] = { 154,154,154 };
static void init_context(int SliceQPY,
context_model* model,
const int* initValues, int len)
{
for (int i=0;i<len;i++)
{
set_initValue(SliceQPY, &model[i], initValues[i], 1);
}
}
static void init_context_const(int SliceQPY,
context_model* model,
int initValue, int len)
{
set_initValue(SliceQPY, model, initValue, len);
}
void initialize_CABAC_models(context_model context_model_table[CONTEXT_MODEL_TABLE_LENGTH],
int initType,
int QPY)
{
context_model* cm = context_model_table; // just an abbreviation
if (initType > 0) {
init_context(QPY, cm+CONTEXT_MODEL_CU_SKIP_FLAG, initValue_cu_skip_flag[initType-1], 3);
init_context(QPY, cm+CONTEXT_MODEL_PRED_MODE_FLAG, &initValue_pred_mode_flag[initType-1], 1);
init_context(QPY, cm+CONTEXT_MODEL_MERGE_FLAG, &initValue_merge_flag[initType-1],1);
init_context(QPY, cm+CONTEXT_MODEL_MERGE_IDX, &initValue_merge_idx[initType-1], 1);
init_context(QPY, cm+CONTEXT_MODEL_INTER_PRED_IDC, initValue_inter_pred_idc, 5);
init_context(QPY, cm+CONTEXT_MODEL_REF_IDX_LX, initValue_ref_idx_lX, 2);
init_context(QPY, cm+CONTEXT_MODEL_ABS_MVD_GREATER01_FLAG, &initValue_abs_mvd_greater01_flag[initType == 1 ? 0 : 2], 2);
init_context(QPY, cm+CONTEXT_MODEL_MVP_LX_FLAG, initValue_mvp_lx_flag, 1);
init_context(QPY, cm+CONTEXT_MODEL_RQT_ROOT_CBF, initValue_rqt_root_cbf, 1);
init_context_const(QPY, cm+CONTEXT_MODEL_RDPCM_FLAG, 139, 2);
init_context_const(QPY, cm+CONTEXT_MODEL_RDPCM_DIR, 139, 2);
}
init_context(QPY, cm+CONTEXT_MODEL_SPLIT_CU_FLAG, initValue_split_cu_flag[initType], 3);
init_context(QPY, cm+CONTEXT_MODEL_PART_MODE, &initValue_part_mode[(initType!=2 ? initType : 5)], 4);
init_context(QPY, cm+CONTEXT_MODEL_PREV_INTRA_LUMA_PRED_FLAG, &initValue_prev_intra_luma_pred_flag[initType], 1);
init_context(QPY, cm+CONTEXT_MODEL_INTRA_CHROMA_PRED_MODE, &initValue_intra_chroma_pred_mode[initType], 1);
init_context(QPY, cm+CONTEXT_MODEL_CBF_LUMA, &initValue_cbf_luma[initType == 0 ? 0 : 2], 2);
init_context(QPY, cm+CONTEXT_MODEL_CBF_CHROMA, &initValue_cbf_chroma[initType * 4], 4);
init_context(QPY, cm+CONTEXT_MODEL_SPLIT_TRANSFORM_FLAG, &initValue_split_transform_flag[initType * 3], 3);
init_context(QPY, cm+CONTEXT_MODEL_LAST_SIGNIFICANT_COEFFICIENT_X_PREFIX, &initValue_last_significant_coefficient_prefix[initType * 18], 18);
init_context(QPY, cm+CONTEXT_MODEL_LAST_SIGNIFICANT_COEFFICIENT_Y_PREFIX, &initValue_last_significant_coefficient_prefix[initType * 18], 18);
init_context(QPY, cm+CONTEXT_MODEL_CODED_SUB_BLOCK_FLAG, &initValue_coded_sub_block_flag[initType * 4], 4);
init_context(QPY, cm+CONTEXT_MODEL_SIGNIFICANT_COEFF_FLAG, initValue_significant_coeff_flag[initType], 42);
init_context(QPY, cm+CONTEXT_MODEL_SIGNIFICANT_COEFF_FLAG+42, initValue_significant_coeff_flag_skipmode[initType], 2);
init_context(QPY, cm+CONTEXT_MODEL_COEFF_ABS_LEVEL_GREATER1_FLAG, &initValue_coeff_abs_level_greater1_flag[initType * 24], 24);
init_context(QPY, cm+CONTEXT_MODEL_COEFF_ABS_LEVEL_GREATER2_FLAG, &initValue_coeff_abs_level_greater2_flag[initType * 6], 6);
init_context(QPY, cm+CONTEXT_MODEL_SAO_MERGE_FLAG, &initValue_sao_merge_leftUp_flag[initType], 1);
init_context(QPY, cm+CONTEXT_MODEL_SAO_TYPE_IDX, &initValue_sao_type_idx_lumaChroma_flag[initType], 1);
init_context(QPY, cm+CONTEXT_MODEL_CU_QP_DELTA_ABS, initValue_cu_qp_delta_abs, 2);
init_context(QPY, cm+CONTEXT_MODEL_TRANSFORM_SKIP_FLAG, initValue_transform_skip_flag, 2);
init_context(QPY, cm+CONTEXT_MODEL_CU_TRANSQUANT_BYPASS_FLAG, &initValue_cu_transquant_bypass_flag[initType], 1);
init_context_const(QPY, cm+CONTEXT_MODEL_LOG2_RES_SCALE_ABS_PLUS1, 154, 8);
init_context_const(QPY, cm+CONTEXT_MODEL_RES_SCALE_SIGN_FLAG, 154, 2);
init_context_const(QPY, cm+CONTEXT_MODEL_CU_CHROMA_QP_OFFSET_FLAG, 154, 1);
init_context_const(QPY, cm+CONTEXT_MODEL_CU_CHROMA_QP_OFFSET_IDX, 154, 1);
}