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| 1 /* |
| 2 * Copyright (c) 2007 Michael Niedermayer |
| 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 /* layer 3 "granule" */ |
| 22 typedef struct GranuleDef { |
| 23 uint8_t scfsi; |
| 24 int part2_3_length; |
| 25 int big_values; |
| 26 int global_gain; |
| 27 int scalefac_compress; |
| 28 uint8_t block_type; |
| 29 uint8_t switch_point; |
| 30 int table_select[3]; |
| 31 int subblock_gain[3]; |
| 32 uint8_t scalefac_scale; |
| 33 uint8_t count1table_select; |
| 34 int region_size[3]; /* number of huffman codes in each region */ |
| 35 int preflag; |
| 36 int short_start, long_end; /* long/short band indexes */ |
| 37 uint8_t scale_factors[40]; |
| 38 int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */ |
| 39 } GranuleDef; |
| 40 |
| 41 void ff_mp3_init(void); |
| 42 |
| 43 /** |
| 44 * Compute huffman coded region sizes. |
| 45 */ |
| 46 void ff_init_short_region(MPADecodeContext *s, GranuleDef *g); |
| 47 |
| 48 /** |
| 49 * Compute huffman coded region sizes. |
| 50 */ |
| 51 void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2); |
| 52 |
| 53 void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g); |
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