diff options
| -rw-r--r-- | libavcodec/mpegaudio3.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/libavcodec/mpegaudio3.h b/libavcodec/mpegaudio3.h new file mode 100644 index 0000000000..c374a59a76 --- /dev/null +++ b/libavcodec/mpegaudio3.h @@ -0,0 +1,53 @@ +/* + * 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); |