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header for common code between mp3 decoder and encoder.

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unfinished, iam just commiting this so the functions that should be
non static have prototypes.

Originally committed as revision 22270 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-03-06 23:36:30 +00:00
parent 1e50348a2a
commit d5dfecb1ea
1 changed files with 53 additions and 0 deletions
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libavcodec/mpegaudio3.h Normal file
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/*
* Copyright (c) 2007 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* layer 3 "granule" */
typedef struct GranuleDef {
uint8_t scfsi;
int part2_3_length;
int big_values;
int global_gain;
int scalefac_compress;
uint8_t block_type;
uint8_t switch_point;
int table_select[3];
int subblock_gain[3];
uint8_t scalefac_scale;
uint8_t count1table_select;
int region_size[3]; /* number of huffman codes in each region */
int preflag;
int short_start, long_end; /* long/short band indexes */
uint8_t scale_factors[40];
int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
} GranuleDef;
void ff_mp3_init(void);
/**
* Compute huffman coded region sizes.
*/
void ff_init_short_region(MPADecodeContext *s, GranuleDef *g);
/**
* Compute huffman coded region sizes.
*/
void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2);
void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g);