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54 lines
1.7 KiB
54 lines
1.7 KiB
15 years ago
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/*
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* Copyright (c) 2007 Michael Niedermayer
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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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/* layer 3 "granule" */
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typedef struct GranuleDef {
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uint8_t scfsi;
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int part2_3_length;
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int big_values;
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int global_gain;
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int scalefac_compress;
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uint8_t block_type;
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uint8_t switch_point;
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int table_select[3];
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int subblock_gain[3];
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uint8_t scalefac_scale;
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uint8_t count1table_select;
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int region_size[3]; /* number of huffman codes in each region */
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int preflag;
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int short_start, long_end; /* long/short band indexes */
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uint8_t scale_factors[40];
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int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
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} GranuleDef;
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void ff_mp3_init(void);
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/**
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* Compute huffman coded region sizes.
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*/
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void ff_init_short_region(MPADecodeContext *s, GranuleDef *g);
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/**
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* Compute huffman coded region sizes.
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*/
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void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2);
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void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g);
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