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874 lines
24 KiB
C
874 lines
24 KiB
C
/*
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* HEVC CABAC decoding
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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* Copyright (C) 2012 - 2013 Gildas Cocherel
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "cabac_functions.h"
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#include "hevc.h"
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#include "hevcdec.h"
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#define CABAC_MAX_BIN 31
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/**
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* number of bin by SyntaxElement.
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*/
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static const int8_t num_bins_in_se[] = {
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1, // sao_merge_flag
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1, // sao_type_idx
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0, // sao_eo_class
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0, // sao_band_position
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0, // sao_offset_abs
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0, // sao_offset_sign
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0, // end_of_slice_flag
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3, // split_coding_unit_flag
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1, // cu_transquant_bypass_flag
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3, // skip_flag
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3, // cu_qp_delta
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1, // pred_mode
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4, // part_mode
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0, // pcm_flag
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1, // prev_intra_luma_pred_mode
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0, // mpm_idx
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0, // rem_intra_luma_pred_mode
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2, // intra_chroma_pred_mode
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1, // merge_flag
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1, // merge_idx
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5, // inter_pred_idc
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2, // ref_idx_l0
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2, // ref_idx_l1
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2, // abs_mvd_greater0_flag
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2, // abs_mvd_greater1_flag
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0, // abs_mvd_minus2
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0, // mvd_sign_flag
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1, // mvp_lx_flag
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1, // no_residual_data_flag
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3, // split_transform_flag
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2, // cbf_luma
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4, // cbf_cb, cbf_cr
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2, // transform_skip_flag[][]
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18, // last_significant_coeff_x_prefix
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18, // last_significant_coeff_y_prefix
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0, // last_significant_coeff_x_suffix
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0, // last_significant_coeff_y_suffix
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4, // significant_coeff_group_flag
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42, // significant_coeff_flag
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24, // coeff_abs_level_greater1_flag
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6, // coeff_abs_level_greater2_flag
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0, // coeff_abs_level_remaining
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0, // coeff_sign_flag
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};
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/**
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* Offset to ctxIdx 0 in init_values and states, indexed by SyntaxElement.
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*/
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static const int elem_offset[sizeof(num_bins_in_se)] = {
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0,
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1,
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2,
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2,
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2,
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2,
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2,
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2,
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5,
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6,
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9,
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12,
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13,
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17,
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17,
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18,
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18,
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18,
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20,
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21,
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22,
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27,
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29,
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31,
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33,
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35,
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35,
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35,
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36,
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37,
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40,
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42,
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46,
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48,
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66,
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84,
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84,
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84,
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88,
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130,
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154,
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160,
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160,
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};
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#define CNU 154
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/**
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* Indexed by init_type
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*/
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static const uint8_t init_values[3][HEVC_CONTEXTS] = {
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{ // sao_merge_flag
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153,
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// sao_type_idx
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200,
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// split_coding_unit_flag
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139, 141, 157,
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// cu_transquant_bypass_flag
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154,
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// skip_flag
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CNU, CNU, CNU,
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// cu_qp_delta
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154, 154, 154,
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// pred_mode
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CNU,
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// part_mode
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184, CNU, CNU, CNU,
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// prev_intra_luma_pred_mode
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184,
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// intra_chroma_pred_mode
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63, 139,
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// merge_flag
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CNU,
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// merge_idx
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CNU,
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// inter_pred_idc
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CNU, CNU, CNU, CNU, CNU,
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// ref_idx_l0
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CNU, CNU,
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// ref_idx_l1
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CNU, CNU,
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// abs_mvd_greater1_flag
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CNU, CNU,
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// abs_mvd_greater1_flag
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CNU, CNU,
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// mvp_lx_flag
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CNU,
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// no_residual_data_flag
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CNU,
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// split_transform_flag
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153, 138, 138,
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// cbf_luma
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111, 141,
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// cbf_cb, cbf_cr
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94, 138, 182, 154,
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// transform_skip_flag
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139, 139,
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// last_significant_coeff_x_prefix
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110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111,
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79, 108, 123, 63,
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// last_significant_coeff_y_prefix
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110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111,
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79, 108, 123, 63,
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// significant_coeff_group_flag
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91, 171, 134, 141,
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// significant_coeff_flag
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111, 111, 125, 110, 110, 94, 124, 108, 124, 107, 125, 141, 179, 153,
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125, 107, 125, 141, 179, 153, 125, 107, 125, 141, 179, 153, 125, 140,
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139, 182, 182, 152, 136, 152, 136, 153, 136, 139, 111, 136, 139, 111,
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// coeff_abs_level_greater1_flag
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140, 92, 137, 138, 140, 152, 138, 139, 153, 74, 149, 92, 139, 107,
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122, 152, 140, 179, 166, 182, 140, 227, 122, 197,
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// coeff_abs_level_greater2_flag
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138, 153, 136, 167, 152, 152, },
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{ // sao_merge_flag
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153,
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// sao_type_idx
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185,
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// split_coding_unit_flag
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107, 139, 126,
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// cu_transquant_bypass_flag
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154,
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// skip_flag
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197, 185, 201,
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// cu_qp_delta
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154, 154, 154,
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// pred_mode
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149,
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// part_mode
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154, 139, 154, 154,
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// prev_intra_luma_pred_mode
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154,
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// intra_chroma_pred_mode
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152, 139,
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// merge_flag
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110,
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// merge_idx
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122,
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// inter_pred_idc
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95, 79, 63, 31, 31,
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// ref_idx_l0
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153, 153,
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// ref_idx_l1
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153, 153,
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// abs_mvd_greater1_flag
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140, 198,
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// abs_mvd_greater1_flag
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140, 198,
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// mvp_lx_flag
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168,
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// no_residual_data_flag
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79,
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// split_transform_flag
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124, 138, 94,
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// cbf_luma
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153, 111,
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// cbf_cb, cbf_cr
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149, 107, 167, 154,
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// transform_skip_flag
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139, 139,
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// last_significant_coeff_x_prefix
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125, 110, 94, 110, 95, 79, 125, 111, 110, 78, 110, 111, 111, 95,
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94, 108, 123, 108,
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// last_significant_coeff_y_prefix
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125, 110, 94, 110, 95, 79, 125, 111, 110, 78, 110, 111, 111, 95,
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94, 108, 123, 108,
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// significant_coeff_group_flag
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121, 140, 61, 154,
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// significant_coeff_flag
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155, 154, 139, 153, 139, 123, 123, 63, 153, 166, 183, 140, 136, 153,
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154, 166, 183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170,
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153, 123, 123, 107, 121, 107, 121, 167, 151, 183, 140, 151, 183, 140,
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// coeff_abs_level_greater1_flag
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154, 196, 196, 167, 154, 152, 167, 182, 182, 134, 149, 136, 153, 121,
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136, 137, 169, 194, 166, 167, 154, 167, 137, 182,
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// coeff_abs_level_greater2_flag
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107, 167, 91, 122, 107, 167, },
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{ // sao_merge_flag
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153,
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// sao_type_idx
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160,
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// split_coding_unit_flag
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107, 139, 126,
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// cu_transquant_bypass_flag
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154,
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// skip_flag
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197, 185, 201,
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// cu_qp_delta
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154, 154, 154,
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// pred_mode
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134,
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// part_mode
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154, 139, 154, 154,
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// prev_intra_luma_pred_mode
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183,
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// intra_chroma_pred_mode
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152, 139,
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// merge_flag
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154,
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// merge_idx
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137,
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// inter_pred_idc
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95, 79, 63, 31, 31,
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// ref_idx_l0
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153, 153,
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// ref_idx_l1
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153, 153,
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// abs_mvd_greater1_flag
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169, 198,
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// abs_mvd_greater1_flag
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169, 198,
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// mvp_lx_flag
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168,
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// no_residual_data_flag
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79,
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// split_transform_flag
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224, 167, 122,
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// cbf_luma
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153, 111,
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// cbf_cb, cbf_cr
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149, 92, 167, 154,
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// transform_skip_flag
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139, 139,
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// last_significant_coeff_x_prefix
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125, 110, 124, 110, 95, 94, 125, 111, 111, 79, 125, 126, 111, 111,
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79, 108, 123, 93,
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// last_significant_coeff_y_prefix
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125, 110, 124, 110, 95, 94, 125, 111, 111, 79, 125, 126, 111, 111,
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79, 108, 123, 93,
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// significant_coeff_group_flag
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121, 140, 61, 154,
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// significant_coeff_flag
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170, 154, 139, 153, 139, 123, 123, 63, 124, 166, 183, 140, 136, 153,
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154, 166, 183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170,
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153, 138, 138, 122, 121, 122, 121, 167, 151, 183, 140, 151, 183, 140,
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// coeff_abs_level_greater1_flag
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154, 196, 167, 167, 154, 152, 167, 182, 182, 134, 149, 136, 153, 121,
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136, 122, 169, 208, 166, 167, 154, 152, 167, 182,
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// coeff_abs_level_greater2_flag
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107, 167, 91, 107, 107, 167, },
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};
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void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts)
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{
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if (s->ps.pps->entropy_coding_sync_enabled_flag &&
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(ctb_addr_ts % s->ps.sps->ctb_width == 2 ||
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(s->ps.sps->ctb_width == 2 &&
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ctb_addr_ts % s->ps.sps->ctb_width == 0))) {
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memcpy(s->cabac_state, s->HEVClc.cabac_state, HEVC_CONTEXTS);
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}
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}
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static void load_states(HEVCContext *s)
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{
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memcpy(s->HEVClc.cabac_state, s->cabac_state, HEVC_CONTEXTS);
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}
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static void cabac_reinit(HEVCLocalContext *lc)
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{
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skip_bytes(&lc->cc, 0);
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}
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static void cabac_init_decoder(HEVCContext *s)
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{
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GetBitContext *gb = &s->HEVClc.gb;
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skip_bits(gb, 1);
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align_get_bits(gb);
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ff_init_cabac_decoder(&s->HEVClc.cc,
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gb->buffer + get_bits_count(gb) / 8,
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(get_bits_left(gb) + 7) / 8);
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}
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static void cabac_init_state(HEVCContext *s)
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{
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int init_type = 2 - s->sh.slice_type;
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int i;
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if (s->sh.cabac_init_flag && s->sh.slice_type != HEVC_SLICE_I)
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init_type ^= 3;
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for (i = 0; i < HEVC_CONTEXTS; i++) {
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int init_value = init_values[init_type][i];
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int m = (init_value >> 4) * 5 - 45;
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int n = ((init_value & 15) << 3) - 16;
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int pre = 2 * (((m * av_clip(s->sh.slice_qp, 0, 51)) >> 4) + n) - 127;
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pre ^= pre >> 31;
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if (pre > 124)
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pre = 124 + (pre & 1);
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s->HEVClc.cabac_state[i] = pre;
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}
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}
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void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts)
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{
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if (ctb_addr_ts == s->ps.pps->ctb_addr_rs_to_ts[s->sh.slice_ctb_addr_rs]) {
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cabac_init_decoder(s);
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if (s->sh.dependent_slice_segment_flag == 0 ||
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(s->ps.pps->tiles_enabled_flag &&
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s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]))
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cabac_init_state(s);
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if (!s->sh.first_slice_in_pic_flag &&
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s->ps.pps->entropy_coding_sync_enabled_flag) {
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if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
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if (s->ps.sps->ctb_width == 1)
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cabac_init_state(s);
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else if (s->sh.dependent_slice_segment_flag == 1)
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load_states(s);
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}
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}
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} else {
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if (s->ps.pps->tiles_enabled_flag &&
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s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]) {
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cabac_reinit(&s->HEVClc);
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cabac_init_state(s);
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}
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if (s->ps.pps->entropy_coding_sync_enabled_flag) {
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if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
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get_cabac_terminate(&s->HEVClc.cc);
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cabac_reinit(&s->HEVClc);
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if (s->ps.sps->ctb_width == 1)
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cabac_init_state(s);
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else
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load_states(s);
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}
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}
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}
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}
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#define GET_CABAC(ctx) get_cabac(&s->HEVClc.cc, &s->HEVClc.cabac_state[ctx])
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int ff_hevc_sao_merge_flag_decode(HEVCContext *s)
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{
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return GET_CABAC(elem_offset[SAO_MERGE_FLAG]);
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}
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int ff_hevc_sao_type_idx_decode(HEVCContext *s)
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{
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if (!GET_CABAC(elem_offset[SAO_TYPE_IDX]))
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return 0;
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if (!get_cabac_bypass(&s->HEVClc.cc))
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return SAO_BAND;
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return SAO_EDGE;
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}
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int ff_hevc_sao_band_position_decode(HEVCContext *s)
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{
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int i;
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int value = get_cabac_bypass(&s->HEVClc.cc);
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for (i = 0; i < 4; i++)
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value = (value << 1) | get_cabac_bypass(&s->HEVClc.cc);
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return value;
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}
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int ff_hevc_sao_offset_abs_decode(HEVCContext *s)
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{
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int i = 0;
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int length = (1 << (FFMIN(s->ps.sps->bit_depth, 10) - 5)) - 1;
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while (i < length && get_cabac_bypass(&s->HEVClc.cc))
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i++;
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return i;
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}
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int ff_hevc_sao_offset_sign_decode(HEVCContext *s)
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{
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return get_cabac_bypass(&s->HEVClc.cc);
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}
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int ff_hevc_sao_eo_class_decode(HEVCContext *s)
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{
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int ret = get_cabac_bypass(&s->HEVClc.cc) << 1;
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ret |= get_cabac_bypass(&s->HEVClc.cc);
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return ret;
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}
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int ff_hevc_end_of_slice_flag_decode(HEVCContext *s)
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{
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return get_cabac_terminate(&s->HEVClc.cc);
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}
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int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s)
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{
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return GET_CABAC(elem_offset[CU_TRANSQUANT_BYPASS_FLAG]);
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}
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int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0, int x_cb, int y_cb)
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{
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int min_cb_width = s->ps.sps->min_cb_width;
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int inc = 0;
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int x0b = x0 & ((1 << s->ps.sps->log2_ctb_size) - 1);
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int y0b = y0 & ((1 << s->ps.sps->log2_ctb_size) - 1);
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if (s->HEVClc.ctb_left_flag || x0b)
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inc = !!SAMPLE_CTB(s->skip_flag, x_cb - 1, y_cb);
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if (s->HEVClc.ctb_up_flag || y0b)
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inc += !!SAMPLE_CTB(s->skip_flag, x_cb, y_cb - 1);
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return GET_CABAC(elem_offset[SKIP_FLAG] + inc);
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}
|
|
|
|
int ff_hevc_cu_qp_delta_abs(HEVCContext *s)
|
|
{
|
|
int prefix_val = 0;
|
|
int suffix_val = 0;
|
|
int inc = 0;
|
|
|
|
while (prefix_val < 5 && GET_CABAC(elem_offset[CU_QP_DELTA] + inc)) {
|
|
prefix_val++;
|
|
inc = 1;
|
|
}
|
|
if (prefix_val >= 5) {
|
|
int k = 0;
|
|
while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc.cc)) {
|
|
suffix_val += 1 << k;
|
|
k++;
|
|
}
|
|
if (k == CABAC_MAX_BIN)
|
|
av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
|
|
|
|
while (k--)
|
|
suffix_val += get_cabac_bypass(&s->HEVClc.cc) << k;
|
|
}
|
|
return prefix_val + suffix_val;
|
|
}
|
|
|
|
int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s)
|
|
{
|
|
return get_cabac_bypass(&s->HEVClc.cc);
|
|
}
|
|
|
|
int ff_hevc_pred_mode_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[PRED_MODE_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth, int x0, int y0)
|
|
{
|
|
int inc = 0, depth_left = 0, depth_top = 0;
|
|
int x0b = x0 & ((1 << s->ps.sps->log2_ctb_size) - 1);
|
|
int y0b = y0 & ((1 << s->ps.sps->log2_ctb_size) - 1);
|
|
int x_cb = x0 >> s->ps.sps->log2_min_cb_size;
|
|
int y_cb = y0 >> s->ps.sps->log2_min_cb_size;
|
|
|
|
if (s->HEVClc.ctb_left_flag || x0b)
|
|
depth_left = s->tab_ct_depth[(y_cb) * s->ps.sps->min_cb_width + x_cb - 1];
|
|
if (s->HEVClc.ctb_up_flag || y0b)
|
|
depth_top = s->tab_ct_depth[(y_cb - 1) * s->ps.sps->min_cb_width + x_cb];
|
|
|
|
inc += (depth_left > ct_depth);
|
|
inc += (depth_top > ct_depth);
|
|
|
|
return GET_CABAC(elem_offset[SPLIT_CODING_UNIT_FLAG] + inc);
|
|
}
|
|
|
|
int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size)
|
|
{
|
|
if (GET_CABAC(elem_offset[PART_MODE])) // 1
|
|
return PART_2Nx2N;
|
|
if (log2_cb_size == s->ps.sps->log2_min_cb_size) {
|
|
if (s->HEVClc.cu.pred_mode == MODE_INTRA) // 0
|
|
return PART_NxN;
|
|
if (GET_CABAC(elem_offset[PART_MODE] + 1)) // 01
|
|
return PART_2NxN;
|
|
if (log2_cb_size == 3) // 00
|
|
return PART_Nx2N;
|
|
if (GET_CABAC(elem_offset[PART_MODE] + 2)) // 001
|
|
return PART_Nx2N;
|
|
return PART_NxN; // 000
|
|
}
|
|
|
|
if (!s->ps.sps->amp_enabled_flag) {
|
|
if (GET_CABAC(elem_offset[PART_MODE] + 1)) // 01
|
|
return PART_2NxN;
|
|
return PART_Nx2N;
|
|
}
|
|
|
|
if (GET_CABAC(elem_offset[PART_MODE] + 1)) { // 01X, 01XX
|
|
if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 011
|
|
return PART_2NxN;
|
|
if (get_cabac_bypass(&s->HEVClc.cc)) // 0101
|
|
return PART_2NxnD;
|
|
return PART_2NxnU; // 0100
|
|
}
|
|
|
|
if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 001
|
|
return PART_Nx2N;
|
|
if (get_cabac_bypass(&s->HEVClc.cc)) // 0001
|
|
return PART_nRx2N;
|
|
return PART_nLx2N; // 0000
|
|
}
|
|
|
|
int ff_hevc_pcm_flag_decode(HEVCContext *s)
|
|
{
|
|
return get_cabac_terminate(&s->HEVClc.cc);
|
|
}
|
|
|
|
int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[PREV_INTRA_LUMA_PRED_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_mpm_idx_decode(HEVCContext *s)
|
|
{
|
|
int i = 0;
|
|
while (i < 2 && get_cabac_bypass(&s->HEVClc.cc))
|
|
i++;
|
|
return i;
|
|
}
|
|
|
|
int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s)
|
|
{
|
|
int i;
|
|
int value = get_cabac_bypass(&s->HEVClc.cc);
|
|
|
|
for (i = 0; i < 4; i++)
|
|
value = (value << 1) | get_cabac_bypass(&s->HEVClc.cc);
|
|
return value;
|
|
}
|
|
|
|
int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s)
|
|
{
|
|
int ret;
|
|
if (!GET_CABAC(elem_offset[INTRA_CHROMA_PRED_MODE]))
|
|
return 4;
|
|
|
|
ret = get_cabac_bypass(&s->HEVClc.cc) << 1;
|
|
ret |= get_cabac_bypass(&s->HEVClc.cc);
|
|
return ret;
|
|
}
|
|
|
|
int ff_hevc_merge_idx_decode(HEVCContext *s)
|
|
{
|
|
int i = GET_CABAC(elem_offset[MERGE_IDX]);
|
|
|
|
if (i != 0) {
|
|
while (i < s->sh.max_num_merge_cand-1 && get_cabac_bypass(&s->HEVClc.cc))
|
|
i++;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
int ff_hevc_merge_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[MERGE_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH)
|
|
{
|
|
if (nPbW + nPbH == 12)
|
|
return GET_CABAC(elem_offset[INTER_PRED_IDC] + 4);
|
|
if (GET_CABAC(elem_offset[INTER_PRED_IDC] + s->HEVClc.ct.depth))
|
|
return PRED_BI;
|
|
|
|
return GET_CABAC(elem_offset[INTER_PRED_IDC] + 4);
|
|
}
|
|
|
|
int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx)
|
|
{
|
|
int i = 0;
|
|
int max = num_ref_idx_lx - 1;
|
|
int max_ctx = FFMIN(max, 2);
|
|
|
|
while (i < max_ctx && GET_CABAC(elem_offset[REF_IDX_L0] + i))
|
|
i++;
|
|
if (i == 2) {
|
|
while (i < max && get_cabac_bypass(&s->HEVClc.cc))
|
|
i++;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
int ff_hevc_mvp_lx_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[MVP_LX_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[NO_RESIDUAL_DATA_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_abs_mvd_greater0_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[ABS_MVD_GREATER0_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_abs_mvd_greater1_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[ABS_MVD_GREATER1_FLAG] + 1);
|
|
}
|
|
|
|
int ff_hevc_mvd_decode(HEVCContext *s)
|
|
{
|
|
int ret = 2;
|
|
int k = 1;
|
|
|
|
while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc.cc)) {
|
|
ret += 1 << k;
|
|
k++;
|
|
}
|
|
if (k == CABAC_MAX_BIN)
|
|
av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
|
|
while (k--)
|
|
ret += get_cabac_bypass(&s->HEVClc.cc) << k;
|
|
return get_cabac_bypass_sign(&s->HEVClc.cc, -ret);
|
|
}
|
|
|
|
int ff_hevc_mvd_sign_flag_decode(HEVCContext *s)
|
|
{
|
|
return get_cabac_bypass_sign(&s->HEVClc.cc, -1);
|
|
}
|
|
|
|
int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size)
|
|
{
|
|
return GET_CABAC(elem_offset[SPLIT_TRANSFORM_FLAG] + 5 - log2_trafo_size);
|
|
}
|
|
|
|
int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth)
|
|
{
|
|
return GET_CABAC(elem_offset[CBF_CB_CR] + trafo_depth);
|
|
}
|
|
|
|
int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth)
|
|
{
|
|
return GET_CABAC(elem_offset[CBF_LUMA] + !trafo_depth);
|
|
}
|
|
|
|
int ff_hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx)
|
|
{
|
|
return GET_CABAC(elem_offset[TRANSFORM_SKIP_FLAG] + !!c_idx);
|
|
}
|
|
|
|
#define LAST_SIG_COEFF(elem) \
|
|
int i = 0; \
|
|
int max = (log2_size << 1) - 1; \
|
|
int ctx_offset, ctx_shift; \
|
|
\
|
|
if (c_idx == 0) { \
|
|
ctx_offset = 3 * (log2_size - 2) + ((log2_size - 1) >> 2); \
|
|
ctx_shift = (log2_size + 1) >> 2; \
|
|
} else { \
|
|
ctx_offset = 15; \
|
|
ctx_shift = log2_size - 2; \
|
|
} \
|
|
while (i < max && \
|
|
GET_CABAC(elem_offset[elem] + (i >> ctx_shift) + ctx_offset)) \
|
|
i++; \
|
|
return i;
|
|
|
|
int ff_hevc_last_significant_coeff_x_prefix_decode(HEVCContext *s, int c_idx,
|
|
int log2_size)
|
|
{
|
|
LAST_SIG_COEFF(LAST_SIGNIFICANT_COEFF_X_PREFIX)
|
|
}
|
|
|
|
int ff_hevc_last_significant_coeff_y_prefix_decode(HEVCContext *s, int c_idx,
|
|
int log2_size)
|
|
{
|
|
LAST_SIG_COEFF(LAST_SIGNIFICANT_COEFF_Y_PREFIX)
|
|
}
|
|
|
|
int ff_hevc_last_significant_coeff_suffix_decode(HEVCContext *s,
|
|
int last_significant_coeff_prefix)
|
|
{
|
|
int i;
|
|
int length = (last_significant_coeff_prefix >> 1) - 1;
|
|
int value = get_cabac_bypass(&s->HEVClc.cc);
|
|
|
|
for (i = 1; i < length; i++)
|
|
value = (value << 1) | get_cabac_bypass(&s->HEVClc.cc);
|
|
return value;
|
|
}
|
|
|
|
int ff_hevc_significant_coeff_group_flag_decode(HEVCContext *s, int c_idx, int ctx_cg)
|
|
{
|
|
int inc;
|
|
|
|
inc = FFMIN(ctx_cg, 1) + (c_idx>0 ? 2 : 0);
|
|
|
|
return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_GROUP_FLAG] + inc);
|
|
}
|
|
|
|
int ff_hevc_significant_coeff_flag_decode(HEVCContext *s, int c_idx, int x_c, int y_c,
|
|
int log2_trafo_size, int scan_idx, int prev_sig)
|
|
{
|
|
static const uint8_t ctx_idx_map[] = {
|
|
0, 1, 4, 5, 2, 3, 4, 5, 6, 6, 8, 8, 7, 7, 8, 8
|
|
};
|
|
int x_cg = x_c >> 2;
|
|
int y_cg = y_c >> 2;
|
|
int sig_ctx, inc;
|
|
|
|
if (x_c + y_c == 0) {
|
|
sig_ctx = 0;
|
|
} else if (log2_trafo_size == 2) {
|
|
sig_ctx = ctx_idx_map[(y_c << 2) + x_c];
|
|
} else {
|
|
switch (prev_sig) {
|
|
case 0: {
|
|
int x_off = x_c & 3;
|
|
int y_off = y_c & 3;
|
|
sig_ctx = ((x_off + y_off) == 0) ? 2 : ((x_off + y_off) <= 2) ? 1 : 0;
|
|
}
|
|
break;
|
|
case 1:
|
|
sig_ctx = 2 - FFMIN(y_c & 3, 2);
|
|
break;
|
|
case 2:
|
|
sig_ctx = 2 - FFMIN(x_c & 3, 2);
|
|
break;
|
|
default:
|
|
sig_ctx = 2;
|
|
}
|
|
|
|
if (c_idx == 0 && (x_cg > 0 || y_cg > 0))
|
|
sig_ctx += 3;
|
|
|
|
if (log2_trafo_size == 3) {
|
|
sig_ctx += (scan_idx == SCAN_DIAG) ? 9 : 15;
|
|
} else {
|
|
sig_ctx += c_idx ? 12 : 21;
|
|
}
|
|
}
|
|
|
|
if (c_idx == 0)
|
|
inc = sig_ctx;
|
|
else
|
|
inc = sig_ctx + 27;
|
|
|
|
return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + inc);
|
|
}
|
|
|
|
int ff_hevc_coeff_abs_level_greater1_flag_decode(HEVCContext *s, int c_idx, int inc)
|
|
{
|
|
|
|
if (c_idx > 0)
|
|
inc += 16;
|
|
|
|
return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER1_FLAG] + inc);
|
|
}
|
|
|
|
int ff_hevc_coeff_abs_level_greater2_flag_decode(HEVCContext *s, int c_idx, int inc)
|
|
{
|
|
if (c_idx > 0)
|
|
inc += 4;
|
|
|
|
return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER2_FLAG] + inc);
|
|
}
|
|
|
|
int ff_hevc_coeff_abs_level_remaining(HEVCContext *s, int base_level, int rc_rice_param)
|
|
{
|
|
int prefix = 0;
|
|
int suffix = 0;
|
|
int last_coeff_abs_level_remaining;
|
|
int i;
|
|
|
|
while (prefix < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc.cc))
|
|
prefix++;
|
|
if (prefix == CABAC_MAX_BIN)
|
|
av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix);
|
|
if (prefix < 3) {
|
|
for (i = 0; i < rc_rice_param; i++)
|
|
suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc.cc);
|
|
last_coeff_abs_level_remaining = (prefix << rc_rice_param) + suffix;
|
|
} else {
|
|
int prefix_minus3 = prefix - 3;
|
|
for (i = 0; i < prefix_minus3 + rc_rice_param; i++)
|
|
suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc.cc);
|
|
last_coeff_abs_level_remaining = (((1 << prefix_minus3) + 3 - 1)
|
|
<< rc_rice_param) + suffix;
|
|
}
|
|
return last_coeff_abs_level_remaining;
|
|
}
|
|
|
|
int ff_hevc_coeff_sign_flag(HEVCContext *s, uint8_t nb)
|
|
{
|
|
int i;
|
|
int ret = 0;
|
|
|
|
for (i = 0; i < nb; i++)
|
|
ret = (ret << 1) | get_cabac_bypass(&s->HEVClc.cc);
|
|
return ret;
|
|
}
|