00001 /* 00002 * Copyright (c) 2007 Michael Niedermayer 00003 * 00004 * This file is part of FFmpeg. 00005 * 00006 * FFmpeg is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * FFmpeg is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with FFmpeg; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00021 /* layer 3 "granule" */ 00022 typedef struct GranuleDef { 00023 uint8_t scfsi; 00024 int part2_3_length; 00025 int big_values; 00026 int global_gain; 00027 int scalefac_compress; 00028 uint8_t block_type; 00029 uint8_t switch_point; 00030 int table_select[3]; 00031 int subblock_gain[3]; 00032 uint8_t scalefac_scale; 00033 uint8_t count1table_select; 00034 int region_size[3]; /* number of huffman codes in each region */ 00035 int preflag; 00036 int short_start, long_end; /* long/short band indexes */ 00037 uint8_t scale_factors[40]; 00038 int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */ 00039 } GranuleDef; 00040 00041 void ff_mp3_init(void); 00042 00046 void ff_init_short_region(MPADecodeContext *s, GranuleDef *g); 00047 00051 void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2); 00052 00053 void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g);
1.5.8