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392 lines
12 KiB
C
392 lines
12 KiB
C
/*****************************************************************************
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* This file is part of Kvazaar HEVC encoder.
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*
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* Copyright (C) 2013-2014 Tampere University of Technology and others (see
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* COPYING file).
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*
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* Kvazaar is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Kvazaar is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
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****************************************************************************/
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/*
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* \file
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*/
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#include "context.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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#include "encoder.h"
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// stuff
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const uint8_t INIT_SAO_MERGE_FLAG[3] = { 153, 153, 153 };
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const uint8_t INIT_SAO_TYPE_IDX[3] = { 160, 185, 200 };
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const uint8_t INIT_QT_ROOT_CBF[3][1] = {
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{ 79, },
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{ 79, },
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{ CNU, },
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};
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const uint8_t INIT_MVP_IDX[3][2] = {
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{ 168, CNU, },
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{ 168, CNU, },
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{ CNU, CNU, },
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};
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const uint8_t INIT_REF_PIC[3][2] = {
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{ 153, 153 },
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{ 153, 153 },
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{ CNU, CNU },
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};
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const uint8_t INIT_MVD[3][2] = {
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{ 169, 198, },
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{ 140, 198, },
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{ CNU, CNU, },
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};
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const uint8_t INIT_MERGE_FLAG_EXT[3][1] = {
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{ 154, },
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{ 110, },
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{ CNU, },
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};
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const uint8_t INIT_MERGE_IDX_EXT[3][1] = {
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{ 137, },
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{ 122, },
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{ CNU, },
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};
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const uint8_t INIT_SKIP_FLAG[3][3] = {
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{ 197, 185, 201, },
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{ 197, 185, 201, },
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{ CNU, CNU, CNU, },
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};
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const uint8_t INIT_PRED_MODE[3][1] = {
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{ 134, },
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{ 149, },
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{ CNU, },
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};
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const uint8_t INIT_PART_SIZE[3][4] = {
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{ 154, 139, CNU, CNU, },
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{ 154, 139, CNU, CNU, },
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{ 184, CNU, CNU, CNU, },
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};
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const uint8_t INIT_SPLIT_FLAG[3][3] = {
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{ 107, 139, 126 },
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{ 107, 139, 126 },
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{ 139, 141, 157 },
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};
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const uint8_t INIT_INTRA_PRED_MODE[3] = {
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183, 154, 184
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};
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const uint8_t INIT_CHROMA_PRED_MODE[3][2] = {
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{ 152, 139 },
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{ 152, 139 },
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{ 63, 139 },
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};
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const uint8_t INIT_TRANS_SUBDIV_FLAG[3][3] = {
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{ 224, 167, 122 },
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{ 124, 138, 94 },
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{ 153, 138, 138 },
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};
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const uint8_t INIT_QT_CBF[3][6] = {
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{ 153, 111, CNU, 149, 92, 167 },
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{ 153, 111, CNU, 149, 107, 167 },
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{ 111, 141, CNU, 94, 138, 182 },
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};
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const uint8_t INIT_SIG_CG_FLAG[3][4] = {
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{ 121, 140, 61, 154 },
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{ 121, 140, 61, 154 },
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{ 91, 171, 134, 141 },
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};
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const uint8_t INIT_SIG_FLAG[3][42] = {
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{170,154,139,153,139,123,123, 63,124,166,
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183,140,136,153,154,166,183,140,136,153,
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154,166,183,140,136,153,154,170,153,138,
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138,122,121,122,121,167,151,183,140,151,
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183,140},
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{155,154,139,153,139,123,123,63,153,166,
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183,140,136,153,154,166,183,140,136,153,
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154,166,183,140,136,153,154,170,153,123,
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123,107,121,107,121,167,151,183,140,151,
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183,140},
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{111,111,125,110,110,94,124,108,124,107,
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125,141,179,153,125,107,125,141,179,153,
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125,107,125,141,179,153,125,140,139,182,
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182,152,136,152,136,153,136,139,111,136,
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139,111},
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};
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const uint8_t INIT_LAST[3][30] = {
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{ 125, 110, 124, 110, 95, 94, 125, 111, 111, 79, 125, 126, 111, 111, 79,
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108, 123, 93, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU },
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{ 125, 110, 94, 110, 95, 79, 125, 111, 110, 78, 110, 111, 111, 95, 94,
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108, 123, 108, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU },
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{ 110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111, 79,
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108, 123, 63, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU },
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};
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const uint8_t INIT_ONE_FLAG[3][24] =
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{
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{154,196,167,167,154,152,167,182,182,134,149,136,153,121,136,122,169,208,166,167,154,152,167,182},
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{154,196,196,167,154,152,167,182,182,134,149,136,153,121,136,137,169,194,166,167,154,167,137,182},
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{140, 92,137,138,140,152,138,139,153, 74,149, 92,139,107,122,152,140,179,166,182,140,227,122,197},
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};
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const uint8_t INIT_ABS_FLAG[3][6] =
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{
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{ 107,167, 91,107,107,167},
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{ 107,167, 91,122,107,167},
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{ 138,153,136,167,152,152},
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};
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static const uint8_t INIT_TRANSFORMSKIP_FLAG[3][2] =
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{
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{ 139, 139},
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{ 139, 139},
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{ 139, 139},
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};
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// CONTEXTS
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cabac_ctx g_sao_merge_flag_model;
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cabac_ctx g_sao_type_idx_model;
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cabac_ctx g_split_flag_model[3]; //!< \brief split flag context models
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cabac_ctx g_intra_mode_model; //!< \brief intra mode context models
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cabac_ctx g_chroma_pred_model[2];
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cabac_ctx g_trans_subdiv_model[3]; //!< \brief intra mode context models
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cabac_ctx g_qt_cbf_model_luma[3];
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cabac_ctx g_qt_cbf_model_chroma[3];
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cabac_ctx g_part_size_model[4];
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cabac_ctx g_cu_sig_coeff_group_model[4];
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cabac_ctx g_cu_sig_model_luma[27];
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cabac_ctx g_cu_sig_model_chroma[15];
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cabac_ctx g_cu_ctx_last_y_luma[15];
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cabac_ctx g_cu_ctx_last_y_chroma[15];
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cabac_ctx g_cu_ctx_last_x_luma[15];
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cabac_ctx g_cu_ctx_last_x_chroma[15];
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cabac_ctx g_cu_one_model_luma[16];
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cabac_ctx g_cu_one_model_chroma[8];
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cabac_ctx g_cu_abs_model_luma[4];
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cabac_ctx g_cu_abs_model_chroma[2];
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cabac_ctx g_cu_pred_mode_model;
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cabac_ctx g_cu_skip_flag_model[3];
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cabac_ctx g_cu_merge_idx_ext_model;
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cabac_ctx g_cu_merge_flag_ext_model;
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cabac_ctx g_cu_mvd_model[2];
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cabac_ctx g_cu_ref_pic_model[2];
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cabac_ctx g_mvp_idx_model[2];
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cabac_ctx g_cu_qt_root_cbf_model;
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cabac_ctx g_transform_skip_model_luma;
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cabac_ctx g_transform_skip_model_chroma;
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/**
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* \brief Initialize struct cabac_ctx.
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*/
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void ctx_init(cabac_ctx *ctx, uint32_t qp, uint32_t init_value)
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{
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int slope = (init_value >> 4) * 5 - 45;
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int offset = ((init_value & 15) << 3) - 16;
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int init_state = MIN(MAX(1, ((slope * (int)qp) >> 4) + offset), 126);
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if (init_state >= 64) {
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ctx->uc_state = ((init_state - 64) << 1) + 1;
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} else {
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ctx->uc_state = (63 - init_state) << 1;
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}
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}
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/**
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* \brief Initialize cabac context to be used for coding
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* \param encoder encoder control struct
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* \param slice type of slice we are coding (P/B/I)
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*/
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void init_contexts(int8_t QP, int8_t slice)
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{
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uint16_t i;
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// Initialize contexts
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ctx_init(&g_transform_skip_model_luma, QP, INIT_TRANSFORMSKIP_FLAG[slice][0]);
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ctx_init(&g_transform_skip_model_chroma, QP, INIT_TRANSFORMSKIP_FLAG[slice][1]);
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ctx_init(&g_sao_merge_flag_model, QP, INIT_SAO_MERGE_FLAG[slice]);
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ctx_init(&g_sao_type_idx_model, QP, INIT_SAO_TYPE_IDX[slice]);
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ctx_init(&g_cu_merge_flag_ext_model, QP, INIT_MERGE_FLAG_EXT[slice][0]);
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ctx_init(&g_cu_merge_idx_ext_model, QP, INIT_MERGE_IDX_EXT[slice][0]);
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ctx_init(&g_cu_pred_mode_model, QP, INIT_PRED_MODE[slice][0]);
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ctx_init(&g_cu_skip_flag_model[0], QP, INIT_SKIP_FLAG[slice][0]);
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ctx_init(&g_cu_skip_flag_model[1], QP, INIT_SKIP_FLAG[slice][1]);
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ctx_init(&g_cu_skip_flag_model[2], QP, INIT_SKIP_FLAG[slice][2]);
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ctx_init(&g_split_flag_model[0], QP, INIT_SPLIT_FLAG[slice][0]);
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ctx_init(&g_split_flag_model[1], QP, INIT_SPLIT_FLAG[slice][1]);
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ctx_init(&g_split_flag_model[2], QP, INIT_SPLIT_FLAG[slice][2]);
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ctx_init(&g_intra_mode_model, QP, INIT_INTRA_PRED_MODE[slice]);
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ctx_init(&g_chroma_pred_model[0], QP, INIT_CHROMA_PRED_MODE[slice][0]);
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ctx_init(&g_chroma_pred_model[1], QP, INIT_CHROMA_PRED_MODE[slice][1]);
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ctx_init(&g_cu_abs_model_chroma[0], QP, INIT_ABS_FLAG[slice][4]);
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ctx_init(&g_cu_abs_model_chroma[1], QP, INIT_ABS_FLAG[slice][5]);
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//TODO: ignore P/B contexts on intra frame
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ctx_init(&g_cu_qt_root_cbf_model, QP, INIT_QT_ROOT_CBF[slice][0]);
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ctx_init(&g_cu_mvd_model[0], QP, INIT_MVD[slice][0]);
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ctx_init(&g_cu_mvd_model[1], QP, INIT_MVD[slice][1]);
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ctx_init(&g_cu_ref_pic_model[0], QP, INIT_REF_PIC[slice][0]);
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ctx_init(&g_cu_ref_pic_model[1], QP, INIT_REF_PIC[slice][1]);
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ctx_init(&g_mvp_idx_model[0], QP, INIT_MVP_IDX[slice][0]);
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ctx_init(&g_mvp_idx_model[1], QP, INIT_MVP_IDX[slice][1]);
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for (i = 0; i < 4; i++) {
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ctx_init(&g_cu_sig_coeff_group_model[i], QP, INIT_SIG_CG_FLAG[slice][i]);
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ctx_init(&g_cu_abs_model_luma[i], QP, INIT_ABS_FLAG[slice][i]);
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ctx_init(&g_part_size_model[i], QP, INIT_PART_SIZE[slice][i]);
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}
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for (i = 0; i < 3; i++) {
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ctx_init(&g_trans_subdiv_model[i], QP, INIT_TRANS_SUBDIV_FLAG[slice][i]);
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ctx_init(&g_qt_cbf_model_luma[i], QP, INIT_QT_CBF[slice][i]);
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ctx_init(&g_qt_cbf_model_chroma[i], QP, INIT_QT_CBF[slice][i+3]);
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}
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for (i = 0; i < 8; i++) {
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ctx_init(&g_cu_one_model_chroma[i], QP, INIT_ONE_FLAG[slice][i+16]);
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}
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for (i = 0; i < 15; i++) {
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ctx_init(&g_cu_ctx_last_y_luma[i], QP, INIT_LAST[slice][i] );
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ctx_init(&g_cu_ctx_last_x_luma[i], QP, INIT_LAST[slice][i] );
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ctx_init(&g_cu_ctx_last_y_chroma[i], QP, INIT_LAST[slice][i+15] );
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ctx_init(&g_cu_ctx_last_x_chroma[i], QP, INIT_LAST[slice][i+15] );
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ctx_init(&g_cu_one_model_luma[i], QP, INIT_ONE_FLAG[slice][i]);
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}
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ctx_init(&g_cu_one_model_luma[15], QP, INIT_ONE_FLAG[slice][15]);
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for (i = 0; i < 27; i++) {
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ctx_init(&g_cu_sig_model_luma[i], QP, INIT_SIG_FLAG[slice][i]);
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if(i < 15) ctx_init(&g_cu_sig_model_chroma[i], QP, INIT_SIG_FLAG[slice][i+27]);
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}
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}
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uint32_t context_get_sig_coeff_group( uint32_t *sig_coeff_group_flag,
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uint32_t pos_x,
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uint32_t pos_y,
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int32_t width)
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{
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uint32_t uiRight = 0;
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uint32_t uiLower = 0;
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width >>= 2;
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if (pos_x < (uint32_t)width - 1) uiRight = (sig_coeff_group_flag[pos_y * width + pos_x + 1] != 0);
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if (pos_y < (uint32_t)width - 1) uiLower = (sig_coeff_group_flag[(pos_y + 1 ) * width + pos_x] != 0);
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return uiRight || uiLower;
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}
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/**
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* \brief Pattern decision for context derivation process of significant_coeff_flag
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* \param sig_coeff_group_flag pointer to prior coded significant coeff group
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* \param pos_x column of current coefficient group
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* \param pos_y row of current coefficient group
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* \param width width of the block
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* \returns pattern for current coefficient group
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*/
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int32_t context_calc_pattern_sig_ctx(const uint32_t *sig_coeff_group_flag, uint32_t pos_x, uint32_t pos_y, int32_t width)
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{
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uint32_t sigRight = 0;
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uint32_t sigLower = 0;
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if (width == 4) return -1;
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width >>= 2;
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if (pos_x < (uint32_t)width - 1) sigRight = (sig_coeff_group_flag[pos_y * width + pos_x + 1] != 0);
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if (pos_y < (uint32_t)width - 1) sigLower = (sig_coeff_group_flag[(pos_y + 1 ) * width + pos_x] != 0);
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return sigRight + (sigLower<<1);
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}
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/**
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* \brief Context derivation process of coeff_abs_significant_flag
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* \param pattern_sig_ctx pattern for current coefficient group
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* \param scan_idx pixel scan type in use
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* \param pos_x column of current scan position
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* \param pos_y row of current scan position
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* \param block_type log2 value of block size if square block, or 4 otherwise
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* \param width width of the block
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* \param texture_type texture type (TEXT_LUMA...)
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* \returns ctx_inc for current scan position
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*/
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int32_t context_get_sig_ctx_inc(int32_t pattern_sig_ctx, uint32_t scan_idx, int32_t pos_x,
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int32_t pos_y, int32_t block_type, int8_t texture_type)
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{
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const int32_t ctx_ind_map[16] =
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{
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0, 1, 4, 5,
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2, 3, 4, 5,
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6, 6, 8, 8,
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7, 7, 8, 8
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};
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int32_t cnt,offset,pos_x_in_subset,pos_y_in_subset;
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if (pos_x + pos_y == 0) return 0;
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if (block_type == 2) return ctx_ind_map[4 * pos_y + pos_x];
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cnt = 0;
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offset = (block_type == 3) ? ((scan_idx == SCAN_DIAG) ? 9 : 15) : ((texture_type == 0) ? 21 : 12);
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pos_x_in_subset = pos_x - ((pos_x>>2)<<2);
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pos_y_in_subset = pos_y - ((pos_y>>2)<<2);
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if (pattern_sig_ctx == 0) {
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cnt = (pos_x_in_subset + pos_y_in_subset <= 2) ? ((pos_x_in_subset + pos_y_in_subset==0) ? 2 : 1) : 0;
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} else if (pattern_sig_ctx==1) {
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cnt = (pos_y_in_subset <= 1) ? ((pos_y_in_subset == 0) ? 2 : 1) : 0;
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} else if (pattern_sig_ctx==2) {
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cnt = (pos_x_in_subset <= 1) ? ((pos_x_in_subset == 0) ? 2 : 1) : 0;
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} else {
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cnt = 2;
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}
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return (( texture_type == 0 && ((pos_x>>2) + (pos_y>>2)) > 0 ) ? 3 : 0) + offset + cnt;
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}
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