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109 lines
4.0 KiB
C
109 lines
4.0 KiB
C
/*
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* Header file for hardcoded CABAC table
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*
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* Copyright (c) 2014 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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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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#ifndef AVCODEC_CABAC_TABLEGEN_H
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#define AVCODEC_CABAC_TABLEGEN_H
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#if CONFIG_HARDCODED_TABLES
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#define cabac_tableinit()
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#include "libavcodec/cabac_tables.h"
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#else
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uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63];
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static const uint8_t lps_range[64][4]= {
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{128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205},
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{116,142,169,195}, {111,135,160,185}, {105,128,152,175}, {100,122,144,166},
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{ 95,116,137,158}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135},
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{ 77, 94,111,128}, { 73, 89,105,122}, { 69, 85,100,116}, { 66, 80, 95,110},
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{ 62, 76, 90,104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89},
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{ 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72},
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{ 41, 50, 59, 69}, { 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59},
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{ 33, 41, 48, 56}, { 32, 39, 46, 53}, { 30, 37, 43, 50}, { 29, 35, 41, 48},
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{ 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41}, { 23, 28, 33, 39},
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{ 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31},
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{ 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25},
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{ 14, 18, 21, 24}, { 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21},
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{ 12, 14, 17, 20}, { 11, 14, 16, 19}, { 11, 13, 15, 18}, { 10, 12, 15, 17},
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{ 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14}, { 8, 10, 12, 14},
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{ 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11},
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{ 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2},
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};
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static const uint8_t mps_state[64]= {
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1, 2, 3, 4, 5, 6, 7, 8,
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9,10,11,12,13,14,15,16,
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17,18,19,20,21,22,23,24,
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25,26,27,28,29,30,31,32,
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33,34,35,36,37,38,39,40,
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41,42,43,44,45,46,47,48,
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49,50,51,52,53,54,55,56,
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57,58,59,60,61,62,62,63,
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};
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static const uint8_t lps_state[64]= {
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0, 0, 1, 2, 2, 4, 4, 5,
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6, 7, 8, 9, 9,11,11,12,
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13,13,15,15,16,16,18,18,
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19,19,21,21,22,22,23,24,
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24,25,26,26,27,27,28,29,
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29,30,30,30,31,32,32,33,
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33,33,34,34,35,35,35,36,
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36,36,37,37,37,38,38,63,
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};
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static const uint8_t last_coeff_flag_offset_8x8[63] = {
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
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5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8
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};
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static av_cold void cabac_tableinit(void)
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{
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int i, j;
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for (i = 0; i < 512; i++)
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ff_h264_norm_shift[i] = i ? 8 - av_log2(i) : 9;
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for(i=0; i<64; i++){
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for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
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ff_h264_lps_range[j*2*64+2*i+0]=
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ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j];
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}
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ff_h264_mlps_state[128 + 2 * i + 0] = 2 * mps_state[i] + 0;
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ff_h264_mlps_state[128 + 2 * i + 1] = 2 * mps_state[i] + 1;
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if( i ){
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ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0;
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ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1;
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}else{
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ff_h264_mlps_state[128-2*i-1]= 1;
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ff_h264_mlps_state[128-2*i-2]= 0;
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}
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}
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for(i=0; i< 63; i++){
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ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i];
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}
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* AVCODEC_CABAC_TABLEGEN_H */
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