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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
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* Copyright (c) 2001-2003 The FFmpeg project
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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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/**
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* @file
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* ADPCM tables
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*/
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#include <stdint.h>
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/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
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reference source */
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const int8_t ff_adpcm_index_table[16] = {
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8,
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};
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/**
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* This is the step table. Note that many programs use slight deviations from
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* this table, but such deviations are negligible:
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*/
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const int16_t ff_adpcm_step_table[89] = {
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7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
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19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
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130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
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337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
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876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
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2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
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5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
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};
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/* These are for MS-ADPCM */
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/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
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ff_adpcm_AdaptCoeff2[] are from libsndfile */
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const int16_t ff_adpcm_AdaptationTable[] = {
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230, 230, 230, 230, 307, 409, 512, 614,
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768, 614, 512, 409, 307, 230, 230, 230
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};
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/** Divided by 4 to fit in 8-bit integers */
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const uint8_t ff_adpcm_AdaptCoeff1[] = {
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64, 128, 0, 48, 60, 115, 98
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};
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/** Divided by 4 to fit in 8-bit integers */
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const int8_t ff_adpcm_AdaptCoeff2[] = {
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0, -64, 0, 16, 0, -52, -58
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};
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const int16_t ff_adpcm_yamaha_indexscale[] = {
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230, 230, 230, 230, 307, 409, 512, 614,
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230, 230, 230, 230, 307, 409, 512, 614
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};
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const int8_t ff_adpcm_yamaha_difflookup[] = {
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1, 3, 5, 7, 9, 11, 13, 15,
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-1, -3, -5, -7, -9, -11, -13, -15
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};
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