forked from KolibriOS/kolibrios
1540 lines
50 KiB
C
1540 lines
50 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#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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av_unused 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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2, // explicit_rdpcm_flag[][]
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2, // explicit_rdpcm_dir_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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44, // 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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8, // log2_res_scale_abs
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2, // res_scale_sign_flag
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1, // cu_chroma_qp_offset_flag
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1, // cu_chroma_qp_offset_idx
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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, // sao_merge_flag
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1, // sao_type_idx
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2, // sao_eo_class
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2, // sao_band_position
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2, // sao_offset_abs
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2, // sao_offset_sign
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2, // end_of_slice_flag
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2, // split_coding_unit_flag
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5, // cu_transquant_bypass_flag
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6, // skip_flag
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9, // cu_qp_delta
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12, // pred_mode
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13, // part_mode
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17, // pcm_flag
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17, // prev_intra_luma_pred_mode
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18, // mpm_idx
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18, // rem_intra_luma_pred_mode
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18, // intra_chroma_pred_mode
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20, // merge_flag
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21, // merge_idx
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22, // inter_pred_idc
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27, // ref_idx_l0
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29, // ref_idx_l1
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31, // abs_mvd_greater0_flag
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33, // abs_mvd_greater1_flag
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35, // abs_mvd_minus2
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35, // mvd_sign_flag
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35, // mvp_lx_flag
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36, // no_residual_data_flag
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37, // split_transform_flag
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40, // cbf_luma
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42, // cbf_cb, cbf_cr
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46, // transform_skip_flag[][]
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48, // explicit_rdpcm_flag[][]
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50, // explicit_rdpcm_dir_flag[][]
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52, // last_significant_coeff_x_prefix
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70, // last_significant_coeff_y_prefix
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88, // last_significant_coeff_x_suffix
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88, // last_significant_coeff_y_suffix
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88, // significant_coeff_group_flag
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92, // significant_coeff_flag
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136, // coeff_abs_level_greater1_flag
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160, // coeff_abs_level_greater2_flag
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166, // coeff_abs_level_remaining
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166, // coeff_sign_flag
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166, // log2_res_scale_abs
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174, // res_scale_sign_flag
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176, // cu_chroma_qp_offset_flag
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177, // cu_chroma_qp_offset_idx
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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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// explicit_rdpcm_flag
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139, 139,
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// explicit_rdpcm_dir_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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141, 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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// log2_res_scale_abs
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154, 154, 154, 154, 154, 154, 154, 154,
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// res_scale_sign_flag
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154, 154,
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// cu_chroma_qp_offset_flag
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154,
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// cu_chroma_qp_offset_idx
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154,
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},
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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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// explicit_rdpcm_flag
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139, 139,
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// explicit_rdpcm_dir_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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140, 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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// log2_res_scale_abs
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154, 154, 154, 154, 154, 154, 154, 154,
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// res_scale_sign_flag
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154, 154,
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// cu_chroma_qp_offset_flag
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154,
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// cu_chroma_qp_offset_idx
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154,
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},
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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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// explicit_rdpcm_flag
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139, 139,
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// explicit_rdpcm_dir_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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140, 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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// log2_res_scale_abs
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154, 154, 154, 154, 154, 154, 154, 154,
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// res_scale_sign_flag
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154, 154,
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// cu_chroma_qp_offset_flag
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154,
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// cu_chroma_qp_offset_idx
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154,
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},
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};
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static const uint8_t scan_1x1[1] = {
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0,
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};
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static const uint8_t horiz_scan2x2_x[4] = {
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0, 1, 0, 1,
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};
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static const uint8_t horiz_scan2x2_y[4] = {
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0, 0, 1, 1
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};
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static const uint8_t horiz_scan4x4_x[16] = {
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0, 1, 2, 3,
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0, 1, 2, 3,
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0, 1, 2, 3,
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0, 1, 2, 3,
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};
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static const uint8_t horiz_scan4x4_y[16] = {
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0, 0, 0, 0,
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1, 1, 1, 1,
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2, 2, 2, 2,
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3, 3, 3, 3,
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};
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static const uint8_t horiz_scan8x8_inv[8][8] = {
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{ 0, 1, 2, 3, 16, 17, 18, 19, },
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{ 4, 5, 6, 7, 20, 21, 22, 23, },
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{ 8, 9, 10, 11, 24, 25, 26, 27, },
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{ 12, 13, 14, 15, 28, 29, 30, 31, },
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{ 32, 33, 34, 35, 48, 49, 50, 51, },
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{ 36, 37, 38, 39, 52, 53, 54, 55, },
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{ 40, 41, 42, 43, 56, 57, 58, 59, },
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{ 44, 45, 46, 47, 60, 61, 62, 63, },
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};
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static const uint8_t diag_scan2x2_x[4] = {
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0, 0, 1, 1,
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};
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static const uint8_t diag_scan2x2_y[4] = {
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0, 1, 0, 1,
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};
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static const uint8_t diag_scan2x2_inv[2][2] = {
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{ 0, 2, },
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{ 1, 3, },
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};
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static const uint8_t diag_scan4x4_inv[4][4] = {
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{ 0, 2, 5, 9, },
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{ 1, 4, 8, 12, },
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{ 3, 7, 11, 14, },
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{ 6, 10, 13, 15, },
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};
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static const uint8_t diag_scan8x8_inv[8][8] = {
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{ 0, 2, 5, 9, 14, 20, 27, 35, },
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{ 1, 4, 8, 13, 19, 26, 34, 42, },
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{ 3, 7, 12, 18, 25, 33, 41, 48, },
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{ 6, 11, 17, 24, 32, 40, 47, 53, },
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{ 10, 16, 23, 31, 39, 46, 52, 57, },
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{ 15, 22, 30, 38, 45, 51, 56, 60, },
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{ 21, 29, 37, 44, 50, 55, 59, 62, },
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{ 28, 36, 43, 49, 54, 58, 61, 63, },
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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 != I_SLICE)
|
|
init_type ^= 3;
|
|
|
|
for (i = 0; i < HEVC_CONTEXTS; i++) {
|
|
int init_value = init_values[init_type][i];
|
|
int m = (init_value >> 4) * 5 - 45;
|
|
int n = ((init_value & 15) << 3) - 16;
|
|
int pre = 2 * (((m * av_clip(s->sh.slice_qp, 0, 51)) >> 4) + n) - 127;
|
|
|
|
pre ^= pre >> 31;
|
|
if (pre > 124)
|
|
pre = 124 + (pre & 1);
|
|
s->HEVClc->cabac_state[i] = pre;
|
|
}
|
|
|
|
for (i = 0; i < 4; i++)
|
|
s->HEVClc->stat_coeff[i] = 0;
|
|
}
|
|
|
|
void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts)
|
|
{
|
|
if (ctb_addr_ts == s->ps.pps->ctb_addr_rs_to_ts[s->sh.slice_ctb_addr_rs]) {
|
|
cabac_init_decoder(s);
|
|
if (s->sh.dependent_slice_segment_flag == 0 ||
|
|
(s->ps.pps->tiles_enabled_flag &&
|
|
s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]))
|
|
cabac_init_state(s);
|
|
|
|
if (!s->sh.first_slice_in_pic_flag &&
|
|
s->ps.pps->entropy_coding_sync_enabled_flag) {
|
|
if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
|
|
if (s->ps.sps->ctb_width == 1)
|
|
cabac_init_state(s);
|
|
else if (s->sh.dependent_slice_segment_flag == 1)
|
|
load_states(s);
|
|
}
|
|
}
|
|
} else {
|
|
if (s->ps.pps->tiles_enabled_flag &&
|
|
s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]) {
|
|
if (s->threads_number == 1)
|
|
cabac_reinit(s->HEVClc);
|
|
else
|
|
cabac_init_decoder(s);
|
|
cabac_init_state(s);
|
|
}
|
|
if (s->ps.pps->entropy_coding_sync_enabled_flag) {
|
|
if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
|
|
get_cabac_terminate(&s->HEVClc->cc);
|
|
if (s->threads_number == 1)
|
|
cabac_reinit(s->HEVClc);
|
|
else
|
|
cabac_init_decoder(s);
|
|
|
|
if (s->ps.sps->ctb_width == 1)
|
|
cabac_init_state(s);
|
|
else
|
|
load_states(s);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#define GET_CABAC(ctx) get_cabac(&s->HEVClc->cc, &s->HEVClc->cabac_state[ctx])
|
|
|
|
int ff_hevc_sao_merge_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[SAO_MERGE_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_sao_type_idx_decode(HEVCContext *s)
|
|
{
|
|
if (!GET_CABAC(elem_offset[SAO_TYPE_IDX]))
|
|
return 0;
|
|
|
|
if (!get_cabac_bypass(&s->HEVClc->cc))
|
|
return SAO_BAND;
|
|
return SAO_EDGE;
|
|
}
|
|
|
|
int ff_hevc_sao_band_position_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_sao_offset_abs_decode(HEVCContext *s)
|
|
{
|
|
int i = 0;
|
|
int length = (1 << (FFMIN(s->ps.sps->bit_depth, 10) - 5)) - 1;
|
|
|
|
while (i < length && get_cabac_bypass(&s->HEVClc->cc))
|
|
i++;
|
|
return i;
|
|
}
|
|
|
|
int ff_hevc_sao_offset_sign_decode(HEVCContext *s)
|
|
{
|
|
return get_cabac_bypass(&s->HEVClc->cc);
|
|
}
|
|
|
|
int ff_hevc_sao_eo_class_decode(HEVCContext *s)
|
|
{
|
|
int ret = get_cabac_bypass(&s->HEVClc->cc) << 1;
|
|
ret |= get_cabac_bypass(&s->HEVClc->cc);
|
|
return ret;
|
|
}
|
|
|
|
int ff_hevc_end_of_slice_flag_decode(HEVCContext *s)
|
|
{
|
|
return get_cabac_terminate(&s->HEVClc->cc);
|
|
}
|
|
|
|
int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[CU_TRANSQUANT_BYPASS_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0, int x_cb, int y_cb)
|
|
{
|
|
int min_cb_width = s->ps.sps->min_cb_width;
|
|
int inc = 0;
|
|
int x0b = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
|
|
int y0b = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);
|
|
|
|
if (s->HEVClc->ctb_left_flag || x0b)
|
|
inc = !!SAMPLE_CTB(s->skip_flag, x_cb - 1, y_cb);
|
|
if (s->HEVClc->ctb_up_flag || y0b)
|
|
inc += !!SAMPLE_CTB(s->skip_flag, x_cb, y_cb - 1);
|
|
|
|
return GET_CABAC(elem_offset[SKIP_FLAG] + inc);
|
|
}
|
|
|
|
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_cu_chroma_qp_offset_flag(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[CU_CHROMA_QP_OFFSET_FLAG]);
|
|
}
|
|
|
|
int ff_hevc_cu_chroma_qp_offset_idx(HEVCContext *s)
|
|
{
|
|
int c_max= FFMAX(5, s->ps.pps->chroma_qp_offset_list_len_minus1);
|
|
int i = 0;
|
|
|
|
while (i < c_max && GET_CABAC(elem_offset[CU_CHROMA_QP_OFFSET_IDX]))
|
|
i++;
|
|
|
|
return i;
|
|
}
|
|
|
|
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 = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
|
|
int y0b = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);
|
|
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]);
|
|
}
|
|
|
|
static av_always_inline int abs_mvd_greater0_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[ABS_MVD_GREATER0_FLAG]);
|
|
}
|
|
|
|
static av_always_inline int abs_mvd_greater1_flag_decode(HEVCContext *s)
|
|
{
|
|
return GET_CABAC(elem_offset[ABS_MVD_GREATER1_FLAG] + 1);
|
|
}
|
|
|
|
static av_always_inline int mvd_decode(HEVCContext *s)
|
|
{
|
|
int ret = 2;
|
|
int k = 1;
|
|
|
|
while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) {
|
|
ret += 1U << k;
|
|
k++;
|
|
}
|
|
if (k == CABAC_MAX_BIN) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
|
|
return 0;
|
|
}
|
|
while (k--)
|
|
ret += get_cabac_bypass(&s->HEVClc->cc) << k;
|
|
return get_cabac_bypass_sign(&s->HEVClc->cc, -ret);
|
|
}
|
|
|
|
static av_always_inline int 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);
|
|
}
|
|
|
|
static int hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx)
|
|
{
|
|
return GET_CABAC(elem_offset[TRANSFORM_SKIP_FLAG] + !!c_idx);
|
|
}
|
|
|
|
static int explicit_rdpcm_flag_decode(HEVCContext *s, int c_idx)
|
|
{
|
|
return GET_CABAC(elem_offset[EXPLICIT_RDPCM_FLAG] + !!c_idx);
|
|
}
|
|
|
|
static int explicit_rdpcm_dir_flag_decode(HEVCContext *s, int c_idx)
|
|
{
|
|
return GET_CABAC(elem_offset[EXPLICIT_RDPCM_DIR_FLAG] + !!c_idx);
|
|
}
|
|
|
|
int ff_hevc_log2_res_scale_abs(HEVCContext *s, int idx) {
|
|
int i =0;
|
|
|
|
while (i < 4 && GET_CABAC(elem_offset[LOG2_RES_SCALE_ABS] + 4 * idx + i))
|
|
i++;
|
|
|
|
return i;
|
|
}
|
|
|
|
int ff_hevc_res_scale_sign_flag(HEVCContext *s, int idx) {
|
|
return GET_CABAC(elem_offset[RES_SCALE_SIGN_FLAG] + idx);
|
|
}
|
|
|
|
static av_always_inline void last_significant_coeff_xy_prefix_decode(HEVCContext *s, int c_idx,
|
|
int log2_size, int *last_scx_prefix, int *last_scy_prefix)
|
|
{
|
|
int i = 0;
|
|
int max = (log2_size << 1) - 1;
|
|
int ctx_offset, ctx_shift;
|
|
|
|
if (!c_idx) {
|
|
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[LAST_SIGNIFICANT_COEFF_X_PREFIX] + (i >> ctx_shift) + ctx_offset))
|
|
i++;
|
|
*last_scx_prefix = i;
|
|
|
|
i = 0;
|
|
while (i < max &&
|
|
GET_CABAC(elem_offset[LAST_SIGNIFICANT_COEFF_Y_PREFIX] + (i >> ctx_shift) + ctx_offset))
|
|
i++;
|
|
*last_scy_prefix = i;
|
|
}
|
|
|
|
static av_always_inline int 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;
|
|
}
|
|
|
|
static av_always_inline int 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);
|
|
}
|
|
static av_always_inline int significant_coeff_flag_decode(HEVCContext *s, int x_c, int y_c,
|
|
int offset, const uint8_t *ctx_idx_map)
|
|
{
|
|
int inc = ctx_idx_map[(y_c << 2) + x_c] + offset;
|
|
return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + inc);
|
|
}
|
|
|
|
static av_always_inline int significant_coeff_flag_decode_0(HEVCContext *s, int c_idx, int offset)
|
|
{
|
|
return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + offset);
|
|
}
|
|
|
|
static av_always_inline int 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);
|
|
}
|
|
|
|
static av_always_inline int 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);
|
|
}
|
|
|
|
static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, 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);
|
|
return 0;
|
|
}
|
|
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;
|
|
}
|
|
|
|
static av_always_inline int coeff_sign_flag_decode(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;
|
|
}
|
|
|
|
void ff_hevc_hls_residual_coding(HEVCContext *s, int x0, int y0,
|
|
int log2_trafo_size, enum ScanType scan_idx,
|
|
int c_idx)
|
|
{
|
|
#define GET_COORD(offset, n) \
|
|
do { \
|
|
x_c = (x_cg << 2) + scan_x_off[n]; \
|
|
y_c = (y_cg << 2) + scan_y_off[n]; \
|
|
} while (0)
|
|
HEVCLocalContext *lc = s->HEVClc;
|
|
int transform_skip_flag = 0;
|
|
|
|
int last_significant_coeff_x, last_significant_coeff_y;
|
|
int last_scan_pos;
|
|
int n_end;
|
|
int num_coeff = 0;
|
|
int greater1_ctx = 1;
|
|
|
|
int num_last_subset;
|
|
int x_cg_last_sig, y_cg_last_sig;
|
|
|
|
const uint8_t *scan_x_cg, *scan_y_cg, *scan_x_off, *scan_y_off;
|
|
|
|
ptrdiff_t stride = s->frame->linesize[c_idx];
|
|
int hshift = s->ps.sps->hshift[c_idx];
|
|
int vshift = s->ps.sps->vshift[c_idx];
|
|
uint8_t *dst = &s->frame->data[c_idx][(y0 >> vshift) * stride +
|
|
((x0 >> hshift) << s->ps.sps->pixel_shift)];
|
|
int16_t *coeffs = (int16_t*)(c_idx ? lc->edge_emu_buffer2 : lc->edge_emu_buffer);
|
|
uint8_t significant_coeff_group_flag[8][8] = {{0}};
|
|
int explicit_rdpcm_flag = 0;
|
|
int explicit_rdpcm_dir_flag;
|
|
|
|
int trafo_size = 1 << log2_trafo_size;
|
|
int i;
|
|
int qp,shift,add,scale,scale_m;
|
|
const uint8_t level_scale[] = { 40, 45, 51, 57, 64, 72 };
|
|
const uint8_t *scale_matrix = NULL;
|
|
uint8_t dc_scale;
|
|
int pred_mode_intra = (c_idx == 0) ? lc->tu.intra_pred_mode :
|
|
lc->tu.intra_pred_mode_c;
|
|
|
|
memset(coeffs, 0, trafo_size * trafo_size * sizeof(int16_t));
|
|
|
|
// Derive QP for dequant
|
|
if (!lc->cu.cu_transquant_bypass_flag) {
|
|
static const int qp_c[] = { 29, 30, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37 };
|
|
static const uint8_t rem6[51 + 4 * 6 + 1] = {
|
|
0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
|
|
3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
|
|
0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3,
|
|
4, 5, 0, 1, 2, 3, 4, 5, 0, 1
|
|
};
|
|
|
|
static const uint8_t div6[51 + 4 * 6 + 1] = {
|
|
0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3,
|
|
3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6,
|
|
7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10,
|
|
10, 10, 11, 11, 11, 11, 11, 11, 12, 12
|
|
};
|
|
int qp_y = lc->qp_y;
|
|
|
|
if (s->ps.pps->transform_skip_enabled_flag &&
|
|
log2_trafo_size <= s->ps.pps->log2_max_transform_skip_block_size) {
|
|
transform_skip_flag = hevc_transform_skip_flag_decode(s, c_idx);
|
|
}
|
|
|
|
if (c_idx == 0) {
|
|
qp = qp_y + s->ps.sps->qp_bd_offset;
|
|
} else {
|
|
int qp_i, offset;
|
|
|
|
if (c_idx == 1)
|
|
offset = s->ps.pps->cb_qp_offset + s->sh.slice_cb_qp_offset +
|
|
lc->tu.cu_qp_offset_cb;
|
|
else
|
|
offset = s->ps.pps->cr_qp_offset + s->sh.slice_cr_qp_offset +
|
|
lc->tu.cu_qp_offset_cr;
|
|
|
|
qp_i = av_clip(qp_y + offset, - s->ps.sps->qp_bd_offset, 57);
|
|
if (s->ps.sps->chroma_format_idc == 1) {
|
|
if (qp_i < 30)
|
|
qp = qp_i;
|
|
else if (qp_i > 43)
|
|
qp = qp_i - 6;
|
|
else
|
|
qp = qp_c[qp_i - 30];
|
|
} else {
|
|
if (qp_i > 51)
|
|
qp = 51;
|
|
else
|
|
qp = qp_i;
|
|
}
|
|
|
|
qp += s->ps.sps->qp_bd_offset;
|
|
}
|
|
|
|
shift = s->ps.sps->bit_depth + log2_trafo_size - 5;
|
|
add = 1 << (shift-1);
|
|
scale = level_scale[rem6[qp]] << (div6[qp]);
|
|
scale_m = 16; // default when no custom scaling lists.
|
|
dc_scale = 16;
|
|
|
|
if (s->ps.sps->scaling_list_enable_flag && !(transform_skip_flag && log2_trafo_size > 2)) {
|
|
const ScalingList *sl = s->ps.pps->scaling_list_data_present_flag ?
|
|
&s->ps.pps->scaling_list : &s->ps.sps->scaling_list;
|
|
int matrix_id = lc->cu.pred_mode != MODE_INTRA;
|
|
|
|
matrix_id = 3 * matrix_id + c_idx;
|
|
|
|
scale_matrix = sl->sl[log2_trafo_size - 2][matrix_id];
|
|
if (log2_trafo_size >= 4)
|
|
dc_scale = sl->sl_dc[log2_trafo_size - 4][matrix_id];
|
|
}
|
|
} else {
|
|
shift = 0;
|
|
add = 0;
|
|
scale = 0;
|
|
dc_scale = 0;
|
|
}
|
|
|
|
if (lc->cu.pred_mode == MODE_INTER && s->ps.sps->explicit_rdpcm_enabled_flag &&
|
|
(transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) {
|
|
explicit_rdpcm_flag = explicit_rdpcm_flag_decode(s, c_idx);
|
|
if (explicit_rdpcm_flag) {
|
|
explicit_rdpcm_dir_flag = explicit_rdpcm_dir_flag_decode(s, c_idx);
|
|
}
|
|
}
|
|
|
|
last_significant_coeff_xy_prefix_decode(s, c_idx, log2_trafo_size,
|
|
&last_significant_coeff_x, &last_significant_coeff_y);
|
|
|
|
if (last_significant_coeff_x > 3) {
|
|
int suffix = last_significant_coeff_suffix_decode(s, last_significant_coeff_x);
|
|
last_significant_coeff_x = (1 << ((last_significant_coeff_x >> 1) - 1)) *
|
|
(2 + (last_significant_coeff_x & 1)) +
|
|
suffix;
|
|
}
|
|
|
|
if (last_significant_coeff_y > 3) {
|
|
int suffix = last_significant_coeff_suffix_decode(s, last_significant_coeff_y);
|
|
last_significant_coeff_y = (1 << ((last_significant_coeff_y >> 1) - 1)) *
|
|
(2 + (last_significant_coeff_y & 1)) +
|
|
suffix;
|
|
}
|
|
|
|
if (scan_idx == SCAN_VERT)
|
|
FFSWAP(int, last_significant_coeff_x, last_significant_coeff_y);
|
|
|
|
x_cg_last_sig = last_significant_coeff_x >> 2;
|
|
y_cg_last_sig = last_significant_coeff_y >> 2;
|
|
|
|
switch (scan_idx) {
|
|
case SCAN_DIAG: {
|
|
int last_x_c = last_significant_coeff_x & 3;
|
|
int last_y_c = last_significant_coeff_y & 3;
|
|
|
|
scan_x_off = ff_hevc_diag_scan4x4_x;
|
|
scan_y_off = ff_hevc_diag_scan4x4_y;
|
|
num_coeff = diag_scan4x4_inv[last_y_c][last_x_c];
|
|
if (trafo_size == 4) {
|
|
scan_x_cg = scan_1x1;
|
|
scan_y_cg = scan_1x1;
|
|
} else if (trafo_size == 8) {
|
|
num_coeff += diag_scan2x2_inv[y_cg_last_sig][x_cg_last_sig] << 4;
|
|
scan_x_cg = diag_scan2x2_x;
|
|
scan_y_cg = diag_scan2x2_y;
|
|
} else if (trafo_size == 16) {
|
|
num_coeff += diag_scan4x4_inv[y_cg_last_sig][x_cg_last_sig] << 4;
|
|
scan_x_cg = ff_hevc_diag_scan4x4_x;
|
|
scan_y_cg = ff_hevc_diag_scan4x4_y;
|
|
} else { // trafo_size == 32
|
|
num_coeff += diag_scan8x8_inv[y_cg_last_sig][x_cg_last_sig] << 4;
|
|
scan_x_cg = ff_hevc_diag_scan8x8_x;
|
|
scan_y_cg = ff_hevc_diag_scan8x8_y;
|
|
}
|
|
break;
|
|
}
|
|
case SCAN_HORIZ:
|
|
scan_x_cg = horiz_scan2x2_x;
|
|
scan_y_cg = horiz_scan2x2_y;
|
|
scan_x_off = horiz_scan4x4_x;
|
|
scan_y_off = horiz_scan4x4_y;
|
|
num_coeff = horiz_scan8x8_inv[last_significant_coeff_y][last_significant_coeff_x];
|
|
break;
|
|
default: //SCAN_VERT
|
|
scan_x_cg = horiz_scan2x2_y;
|
|
scan_y_cg = horiz_scan2x2_x;
|
|
scan_x_off = horiz_scan4x4_y;
|
|
scan_y_off = horiz_scan4x4_x;
|
|
num_coeff = horiz_scan8x8_inv[last_significant_coeff_x][last_significant_coeff_y];
|
|
break;
|
|
}
|
|
num_coeff++;
|
|
num_last_subset = (num_coeff - 1) >> 4;
|
|
|
|
for (i = num_last_subset; i >= 0; i--) {
|
|
int n, m;
|
|
int x_cg, y_cg, x_c, y_c, pos;
|
|
int implicit_non_zero_coeff = 0;
|
|
int64_t trans_coeff_level;
|
|
int prev_sig = 0;
|
|
int offset = i << 4;
|
|
int rice_init = 0;
|
|
|
|
uint8_t significant_coeff_flag_idx[16];
|
|
uint8_t nb_significant_coeff_flag = 0;
|
|
|
|
x_cg = scan_x_cg[i];
|
|
y_cg = scan_y_cg[i];
|
|
|
|
if ((i < num_last_subset) && (i > 0)) {
|
|
int ctx_cg = 0;
|
|
if (x_cg < (1 << (log2_trafo_size - 2)) - 1)
|
|
ctx_cg += significant_coeff_group_flag[x_cg + 1][y_cg];
|
|
if (y_cg < (1 << (log2_trafo_size - 2)) - 1)
|
|
ctx_cg += significant_coeff_group_flag[x_cg][y_cg + 1];
|
|
|
|
significant_coeff_group_flag[x_cg][y_cg] =
|
|
significant_coeff_group_flag_decode(s, c_idx, ctx_cg);
|
|
implicit_non_zero_coeff = 1;
|
|
} else {
|
|
significant_coeff_group_flag[x_cg][y_cg] =
|
|
((x_cg == x_cg_last_sig && y_cg == y_cg_last_sig) ||
|
|
(x_cg == 0 && y_cg == 0));
|
|
}
|
|
|
|
last_scan_pos = num_coeff - offset - 1;
|
|
|
|
if (i == num_last_subset) {
|
|
n_end = last_scan_pos - 1;
|
|
significant_coeff_flag_idx[0] = last_scan_pos;
|
|
nb_significant_coeff_flag = 1;
|
|
} else {
|
|
n_end = 15;
|
|
}
|
|
|
|
if (x_cg < ((1 << log2_trafo_size) - 1) >> 2)
|
|
prev_sig = !!significant_coeff_group_flag[x_cg + 1][y_cg];
|
|
if (y_cg < ((1 << log2_trafo_size) - 1) >> 2)
|
|
prev_sig += (!!significant_coeff_group_flag[x_cg][y_cg + 1] << 1);
|
|
|
|
if (significant_coeff_group_flag[x_cg][y_cg] && n_end >= 0) {
|
|
static const uint8_t ctx_idx_map[] = {
|
|
0, 1, 4, 5, 2, 3, 4, 5, 6, 6, 8, 8, 7, 7, 8, 8, // log2_trafo_size == 2
|
|
1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, // prev_sig == 0
|
|
2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, // prev_sig == 1
|
|
2, 1, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, // prev_sig == 2
|
|
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 // default
|
|
};
|
|
const uint8_t *ctx_idx_map_p;
|
|
int scf_offset = 0;
|
|
if (s->ps.sps->transform_skip_context_enabled_flag &&
|
|
(transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) {
|
|
ctx_idx_map_p = (uint8_t*) &ctx_idx_map[4 * 16];
|
|
if (c_idx == 0) {
|
|
scf_offset = 40;
|
|
} else {
|
|
scf_offset = 14 + 27;
|
|
}
|
|
} else {
|
|
if (c_idx != 0)
|
|
scf_offset = 27;
|
|
if (log2_trafo_size == 2) {
|
|
ctx_idx_map_p = (uint8_t*) &ctx_idx_map[0];
|
|
} else {
|
|
ctx_idx_map_p = (uint8_t*) &ctx_idx_map[(prev_sig + 1) << 4];
|
|
if (c_idx == 0) {
|
|
if ((x_cg > 0 || y_cg > 0))
|
|
scf_offset += 3;
|
|
if (log2_trafo_size == 3) {
|
|
scf_offset += (scan_idx == SCAN_DIAG) ? 9 : 15;
|
|
} else {
|
|
scf_offset += 21;
|
|
}
|
|
} else {
|
|
if (log2_trafo_size == 3)
|
|
scf_offset += 9;
|
|
else
|
|
scf_offset += 12;
|
|
}
|
|
}
|
|
}
|
|
for (n = n_end; n > 0; n--) {
|
|
x_c = scan_x_off[n];
|
|
y_c = scan_y_off[n];
|
|
if (significant_coeff_flag_decode(s, x_c, y_c, scf_offset, ctx_idx_map_p)) {
|
|
significant_coeff_flag_idx[nb_significant_coeff_flag] = n;
|
|
nb_significant_coeff_flag++;
|
|
implicit_non_zero_coeff = 0;
|
|
}
|
|
}
|
|
if (implicit_non_zero_coeff == 0) {
|
|
if (s->ps.sps->transform_skip_context_enabled_flag &&
|
|
(transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) {
|
|
if (c_idx == 0) {
|
|
scf_offset = 42;
|
|
} else {
|
|
scf_offset = 16 + 27;
|
|
}
|
|
} else {
|
|
if (i == 0) {
|
|
if (c_idx == 0)
|
|
scf_offset = 0;
|
|
else
|
|
scf_offset = 27;
|
|
} else {
|
|
scf_offset = 2 + scf_offset;
|
|
}
|
|
}
|
|
if (significant_coeff_flag_decode_0(s, c_idx, scf_offset) == 1) {
|
|
significant_coeff_flag_idx[nb_significant_coeff_flag] = 0;
|
|
nb_significant_coeff_flag++;
|
|
}
|
|
} else {
|
|
significant_coeff_flag_idx[nb_significant_coeff_flag] = 0;
|
|
nb_significant_coeff_flag++;
|
|
}
|
|
}
|
|
|
|
n_end = nb_significant_coeff_flag;
|
|
|
|
|
|
if (n_end) {
|
|
int first_nz_pos_in_cg;
|
|
int last_nz_pos_in_cg;
|
|
int c_rice_param = 0;
|
|
int first_greater1_coeff_idx = -1;
|
|
uint8_t coeff_abs_level_greater1_flag[8];
|
|
uint16_t coeff_sign_flag;
|
|
int sum_abs = 0;
|
|
int sign_hidden;
|
|
int sb_type;
|
|
|
|
|
|
// initialize first elem of coeff_bas_level_greater1_flag
|
|
int ctx_set = (i > 0 && c_idx == 0) ? 2 : 0;
|
|
|
|
if (s->ps.sps->persistent_rice_adaptation_enabled_flag) {
|
|
if (!transform_skip_flag && !lc->cu.cu_transquant_bypass_flag)
|
|
sb_type = 2 * (c_idx == 0 ? 1 : 0);
|
|
else
|
|
sb_type = 2 * (c_idx == 0 ? 1 : 0) + 1;
|
|
c_rice_param = lc->stat_coeff[sb_type] / 4;
|
|
}
|
|
|
|
if (!(i == num_last_subset) && greater1_ctx == 0)
|
|
ctx_set++;
|
|
greater1_ctx = 1;
|
|
last_nz_pos_in_cg = significant_coeff_flag_idx[0];
|
|
|
|
for (m = 0; m < (n_end > 8 ? 8 : n_end); m++) {
|
|
int inc = (ctx_set << 2) + greater1_ctx;
|
|
coeff_abs_level_greater1_flag[m] =
|
|
coeff_abs_level_greater1_flag_decode(s, c_idx, inc);
|
|
if (coeff_abs_level_greater1_flag[m]) {
|
|
greater1_ctx = 0;
|
|
if (first_greater1_coeff_idx == -1)
|
|
first_greater1_coeff_idx = m;
|
|
} else if (greater1_ctx > 0 && greater1_ctx < 3) {
|
|
greater1_ctx++;
|
|
}
|
|
}
|
|
first_nz_pos_in_cg = significant_coeff_flag_idx[n_end - 1];
|
|
|
|
if (lc->cu.cu_transquant_bypass_flag ||
|
|
(lc->cu.pred_mode == MODE_INTRA &&
|
|
s->ps.sps->implicit_rdpcm_enabled_flag && transform_skip_flag &&
|
|
(pred_mode_intra == 10 || pred_mode_intra == 26 )) ||
|
|
explicit_rdpcm_flag)
|
|
sign_hidden = 0;
|
|
else
|
|
sign_hidden = (last_nz_pos_in_cg - first_nz_pos_in_cg >= 4);
|
|
|
|
if (first_greater1_coeff_idx != -1) {
|
|
coeff_abs_level_greater1_flag[first_greater1_coeff_idx] += coeff_abs_level_greater2_flag_decode(s, c_idx, ctx_set);
|
|
}
|
|
if (!s->ps.pps->sign_data_hiding_flag || !sign_hidden ) {
|
|
coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag) << (16 - nb_significant_coeff_flag);
|
|
} else {
|
|
coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag - 1) << (16 - (nb_significant_coeff_flag - 1));
|
|
}
|
|
|
|
for (m = 0; m < n_end; m++) {
|
|
n = significant_coeff_flag_idx[m];
|
|
GET_COORD(offset, n);
|
|
if (m < 8) {
|
|
trans_coeff_level = 1 + coeff_abs_level_greater1_flag[m];
|
|
if (trans_coeff_level == ((m == first_greater1_coeff_idx) ? 3 : 2)) {
|
|
int last_coeff_abs_level_remaining = coeff_abs_level_remaining_decode(s, c_rice_param);
|
|
|
|
trans_coeff_level += last_coeff_abs_level_remaining;
|
|
if (trans_coeff_level > (3 << c_rice_param))
|
|
c_rice_param = s->ps.sps->persistent_rice_adaptation_enabled_flag ? c_rice_param + 1 : FFMIN(c_rice_param + 1, 4);
|
|
if (s->ps.sps->persistent_rice_adaptation_enabled_flag && !rice_init) {
|
|
int c_rice_p_init = lc->stat_coeff[sb_type] / 4;
|
|
if (last_coeff_abs_level_remaining >= (3 << c_rice_p_init))
|
|
lc->stat_coeff[sb_type]++;
|
|
else if (2 * last_coeff_abs_level_remaining < (1 << c_rice_p_init))
|
|
if (lc->stat_coeff[sb_type] > 0)
|
|
lc->stat_coeff[sb_type]--;
|
|
rice_init = 1;
|
|
}
|
|
}
|
|
} else {
|
|
int last_coeff_abs_level_remaining = coeff_abs_level_remaining_decode(s, c_rice_param);
|
|
|
|
trans_coeff_level = 1 + last_coeff_abs_level_remaining;
|
|
if (trans_coeff_level > (3 << c_rice_param))
|
|
c_rice_param = s->ps.sps->persistent_rice_adaptation_enabled_flag ? c_rice_param + 1 : FFMIN(c_rice_param + 1, 4);
|
|
if (s->ps.sps->persistent_rice_adaptation_enabled_flag && !rice_init) {
|
|
int c_rice_p_init = lc->stat_coeff[sb_type] / 4;
|
|
if (last_coeff_abs_level_remaining >= (3 << c_rice_p_init))
|
|
lc->stat_coeff[sb_type]++;
|
|
else if (2 * last_coeff_abs_level_remaining < (1 << c_rice_p_init))
|
|
if (lc->stat_coeff[sb_type] > 0)
|
|
lc->stat_coeff[sb_type]--;
|
|
rice_init = 1;
|
|
}
|
|
}
|
|
if (s->ps.pps->sign_data_hiding_flag && sign_hidden) {
|
|
sum_abs += trans_coeff_level;
|
|
if (n == first_nz_pos_in_cg && (sum_abs&1))
|
|
trans_coeff_level = -trans_coeff_level;
|
|
}
|
|
if (coeff_sign_flag >> 15)
|
|
trans_coeff_level = -trans_coeff_level;
|
|
coeff_sign_flag <<= 1;
|
|
if(!lc->cu.cu_transquant_bypass_flag) {
|
|
if (s->ps.sps->scaling_list_enable_flag && !(transform_skip_flag && log2_trafo_size > 2)) {
|
|
if(y_c || x_c || log2_trafo_size < 4) {
|
|
switch(log2_trafo_size) {
|
|
case 3: pos = (y_c << 3) + x_c; break;
|
|
case 4: pos = ((y_c >> 1) << 3) + (x_c >> 1); break;
|
|
case 5: pos = ((y_c >> 2) << 3) + (x_c >> 2); break;
|
|
default: pos = (y_c << 2) + x_c; break;
|
|
}
|
|
scale_m = scale_matrix[pos];
|
|
} else {
|
|
scale_m = dc_scale;
|
|
}
|
|
}
|
|
trans_coeff_level = (trans_coeff_level * (int64_t)scale * (int64_t)scale_m + add) >> shift;
|
|
if(trans_coeff_level < 0) {
|
|
if((~trans_coeff_level) & 0xFffffffffff8000)
|
|
trans_coeff_level = -32768;
|
|
} else {
|
|
if(trans_coeff_level & 0xffffffffffff8000)
|
|
trans_coeff_level = 32767;
|
|
}
|
|
}
|
|
coeffs[y_c * trafo_size + x_c] = trans_coeff_level;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (lc->cu.cu_transquant_bypass_flag) {
|
|
if (explicit_rdpcm_flag || (s->ps.sps->implicit_rdpcm_enabled_flag &&
|
|
(pred_mode_intra == 10 || pred_mode_intra == 26))) {
|
|
int mode = s->ps.sps->implicit_rdpcm_enabled_flag ? (pred_mode_intra == 26) : explicit_rdpcm_dir_flag;
|
|
|
|
s->hevcdsp.transform_rdpcm(coeffs, log2_trafo_size, mode);
|
|
}
|
|
} else {
|
|
if (transform_skip_flag) {
|
|
int rot = s->ps.sps->transform_skip_rotation_enabled_flag &&
|
|
log2_trafo_size == 2 &&
|
|
lc->cu.pred_mode == MODE_INTRA;
|
|
if (rot) {
|
|
for (i = 0; i < 8; i++)
|
|
FFSWAP(int16_t, coeffs[i], coeffs[16 - i - 1]);
|
|
}
|
|
|
|
s->hevcdsp.transform_skip(coeffs, log2_trafo_size);
|
|
|
|
if (explicit_rdpcm_flag || (s->ps.sps->implicit_rdpcm_enabled_flag &&
|
|
lc->cu.pred_mode == MODE_INTRA &&
|
|
(pred_mode_intra == 10 || pred_mode_intra == 26))) {
|
|
int mode = explicit_rdpcm_flag ? explicit_rdpcm_dir_flag : (pred_mode_intra == 26);
|
|
|
|
s->hevcdsp.transform_rdpcm(coeffs, log2_trafo_size, mode);
|
|
}
|
|
} else if (lc->cu.pred_mode == MODE_INTRA && c_idx == 0 && log2_trafo_size == 2) {
|
|
s->hevcdsp.idct_4x4_luma(coeffs);
|
|
} else {
|
|
int max_xy = FFMAX(last_significant_coeff_x, last_significant_coeff_y);
|
|
if (max_xy == 0)
|
|
s->hevcdsp.idct_dc[log2_trafo_size-2](coeffs);
|
|
else {
|
|
int col_limit = last_significant_coeff_x + last_significant_coeff_y + 4;
|
|
if (max_xy < 4)
|
|
col_limit = FFMIN(4, col_limit);
|
|
else if (max_xy < 8)
|
|
col_limit = FFMIN(8, col_limit);
|
|
else if (max_xy < 12)
|
|
col_limit = FFMIN(24, col_limit);
|
|
s->hevcdsp.idct[log2_trafo_size-2](coeffs, col_limit);
|
|
}
|
|
}
|
|
}
|
|
if (lc->tu.cross_pf) {
|
|
int16_t *coeffs_y = (int16_t*)lc->edge_emu_buffer;
|
|
|
|
for (i = 0; i < (trafo_size * trafo_size); i++) {
|
|
coeffs[i] = coeffs[i] + ((lc->tu.res_scale_val * coeffs_y[i]) >> 3);
|
|
}
|
|
}
|
|
s->hevcdsp.transform_add[log2_trafo_size-2](dst, coeffs, stride);
|
|
}
|
|
|
|
void ff_hevc_hls_mvd_coding(HEVCContext *s, int x0, int y0, int log2_cb_size)
|
|
{
|
|
HEVCLocalContext *lc = s->HEVClc;
|
|
int x = abs_mvd_greater0_flag_decode(s);
|
|
int y = abs_mvd_greater0_flag_decode(s);
|
|
|
|
if (x)
|
|
x += abs_mvd_greater1_flag_decode(s);
|
|
if (y)
|
|
y += abs_mvd_greater1_flag_decode(s);
|
|
|
|
switch (x) {
|
|
case 2: lc->pu.mvd.x = mvd_decode(s); break;
|
|
case 1: lc->pu.mvd.x = mvd_sign_flag_decode(s); break;
|
|
case 0: lc->pu.mvd.x = 0; break;
|
|
}
|
|
|
|
switch (y) {
|
|
case 2: lc->pu.mvd.y = mvd_decode(s); break;
|
|
case 1: lc->pu.mvd.y = mvd_sign_flag_decode(s); break;
|
|
case 0: lc->pu.mvd.y = 0; break;
|
|
}
|
|
}
|
|
|