1/* 2 * Copyright (c) 2001-2003 The ffmpeg Project 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * ADPCM tables 24 */ 25 26#include <stdint.h> 27 28/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM 29 reference source */ 30static const int8_t adpcm_index_table2[4] = { 31 -1, 2, 32 -1, 2, 33}; 34 35static const int8_t adpcm_index_table3[8] = { 36 -1, -1, 1, 2, 37 -1, -1, 1, 2, 38}; 39 40const int8_t ff_adpcm_index_table[16] = { 41 -1, -1, -1, -1, 2, 4, 6, 8, 42 -1, -1, -1, -1, 2, 4, 6, 8, 43}; 44 45static const int8_t adpcm_index_table5[32] = { 46 -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16, 47 -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16, 48}; 49 50const int8_t * const ff_adpcm_index_tables[4] = { 51 &adpcm_index_table2[0], 52 &adpcm_index_table3[0], 53 &ff_adpcm_index_table[0], 54 &adpcm_index_table5[0], 55}; 56 57/** 58 * This is the step table. Note that many programs use slight deviations from 59 * this table, but such deviations are negligible: 60 */ 61const int16_t ff_adpcm_step_table[89] = { 62 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 63 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, 64 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 65 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, 66 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 67 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 68 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, 69 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, 70 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 71}; 72 73const int16_t ff_adpcm_oki_step_table[49] = { 74 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 75 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 76 107, 118, 130, 143, 157, 173, 190, 209, 230, 253, 77 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 78 724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552 79}; 80 81/* These are for MS-ADPCM */ 82/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and 83 ff_adpcm_AdaptCoeff2[] are from libsndfile */ 84const int16_t ff_adpcm_AdaptationTable[] = { 85 230, 230, 230, 230, 307, 409, 512, 614, 86 768, 614, 512, 409, 307, 230, 230, 230 87}; 88 89/** Divided by 4 to fit in 8-bit integers */ 90const uint8_t ff_adpcm_AdaptCoeff1[] = { 91 64, 128, 0, 48, 60, 115, 98 92}; 93 94/** Divided by 4 to fit in 8-bit integers */ 95const int8_t ff_adpcm_AdaptCoeff2[] = { 96 0, -64, 0, 16, 0, -52, -58 97}; 98 99const int16_t ff_adpcm_yamaha_indexscale[] = { 100 230, 230, 230, 230, 307, 409, 512, 614, 101 230, 230, 230, 230, 307, 409, 512, 614 102}; 103 104const int8_t ff_adpcm_yamaha_difflookup[] = { 105 1, 3, 5, 7, 9, 11, 13, 15, 106 -1, -3, -5, -7, -9, -11, -13, -15 107}; 108 109const int16_t ff_adpcm_afc_coeffs[2][16] = { 110 { 0, 2048, 0, 1024, 4096, 3584, 3072, 4608, 4200, 4800, 5120, 2048, 1024, 64512, 64512, 63488 }, 111 { 0, 0, 2048, 1024, 63488, 64000, 64512, 62976, 63288, 63236, 62464, 63488, 64512, 1024, 0, 0 } 112}; 113