2 * Copyright (c) 2007 Michael Niedermayer
4 * This file is part of FFmpeg.
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.
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.
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
21 /* layer 3 "granule" */
22 typedef struct GranuleDef {
27 int scalefac_compress;
32 uint8_t scalefac_scale;
33 uint8_t count1table_select;
34 int region_size[3]; /* number of huffman codes in each region */
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 */
41 void ff_mp3_init(void);
44 * Compute huffman coded region sizes.
46 void ff_init_short_region(MPADecodeContext *s, GranuleDef *g);
49 * Compute huffman coded region sizes.
51 void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2);
53 void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g);