From 826c56d16e55f3819a75d01f957dd295aa1e9f3a Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Wed, 7 Sep 2011 18:34:09 -0400 Subject: adpcm: split ADPCM encoders and decoders into separate files. Move shared tables to a separate file as well. --- libavcodec/adpcm_data.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 libavcodec/adpcm_data.c (limited to 'libavcodec/adpcm_data.c') diff --git a/libavcodec/adpcm_data.c b/libavcodec/adpcm_data.c new file mode 100644 index 0000000000..9dc5670bfc --- /dev/null +++ b/libavcodec/adpcm_data.c @@ -0,0 +1,78 @@ +/* + * Copyright (c) 2001-2003 The ffmpeg Project + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * ADPCM tables + */ + +#include + +/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM + reference source */ +/* This is the index table: */ +const int8_t ff_adpcm_index_table[16] = { + -1, -1, -1, -1, 2, 4, 6, 8, + -1, -1, -1, -1, 2, 4, 6, 8, +}; + +/** + * This is the step table. Note that many programs use slight deviations from + * this table, but such deviations are negligible: + */ +const int16_t ff_adpcm_step_table[89] = { + 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, + 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, + 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, + 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, + 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, + 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, + 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, + 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, + 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 +}; + +/* These are for MS-ADPCM */ +/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and + ff_adpcm_AdaptCoeff2[] are from libsndfile */ +const int16_t ff_adpcm_AdaptationTable[] = { + 230, 230, 230, 230, 307, 409, 512, 614, + 768, 614, 512, 409, 307, 230, 230, 230 +}; + +/** Divided by 4 to fit in 8-bit integers */ +const uint8_t ff_adpcm_AdaptCoeff1[] = { + 64, 128, 0, 48, 60, 115, 98 +}; + +/** Divided by 4 to fit in 8-bit integers */ +const int8_t ff_adpcm_AdaptCoeff2[] = { + 0, -64, 0, 16, 0, -52, -58 +}; + +const int16_t ff_adpcm_yamaha_indexscale[] = { + 230, 230, 230, 230, 307, 409, 512, 614, + 230, 230, 230, 230, 307, 409, 512, 614 +}; + +const int8_t ff_adpcm_yamaha_difflookup[] = { + 1, 3, 5, 7, 9, 11, 13, 15, + -1, -3, -5, -7, -9, -11, -13, -15 +}; -- cgit v1.2.3