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Diffstat (limited to 'codecs/mp3/include/L3.h')
| -rwxr-xr-x | codecs/mp3/include/L3.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/codecs/mp3/include/L3.h b/codecs/mp3/include/L3.h new file mode 100755 index 000000000..e920afd94 --- /dev/null +++ b/codecs/mp3/include/L3.h @@ -0,0 +1,177 @@ +/*____________________________________________________________________________ + + FreeAmp - The Free MP3 Player + + MP3 Decoder originally Copyright (C) 1996-1997 Xing Technology + Corp. http://www.xingtech.com + + Portions Copyright (C) 1998-1999 Emusic.com + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id$ +____________________________________________________________________________*/ + +/**** L3.h *************************************************** + + Layer III structures + + *** Layer III is 32 bit only *** + *** Layer III code assumes 32 bit int *** + +******************************************************************/ + +#define GLOBAL_GAIN_SCALE (4*15) +/* #define GLOBAL_GAIN_SCALE 0 */ + + +#ifdef _M_IX86 +#define LITTLE_ENDIAN 1 +#endif + +#ifdef _M_ALPHA +#define LITTLE_ENDIAN 1 +#endif + +#ifdef sparc +#define LITTLE_ENDIAN 0 +#endif + +#ifndef LITTLE_ENDIAN +#error Layer III LITTLE_ENDIAN must be defined 0 or 1 +#endif + +/*-----------------------------------------------------------*/ +/*---- huffman lookup tables ---*/ +/* endian dependent !!! */ +#if LITTLE_ENDIAN +typedef union +{ + int ptr; + struct + { + unsigned char signbits; + unsigned char x; + unsigned char y; + unsigned char purgebits; // 0 = esc + + } + b; +} +HUFF_ELEMENT; + +#else /* big endian machines */ +typedef union +{ + int ptr; /* int must be 32 bits or more */ + struct + { + unsigned char purgebits; // 0 = esc + + unsigned char y; + unsigned char x; + unsigned char signbits; + } + b; +} +HUFF_ELEMENT; + +#endif +/*--------------------------------------------------------------*/ +typedef struct +{ + unsigned int bitbuf; + int bits; + unsigned char *bs_ptr; + unsigned char *bs_ptr0; + unsigned char *bs_ptr_end; // optional for overrun test + +} +BITDAT; + +/*-- side info ---*/ +typedef struct +{ + int part2_3_length; + int big_values; + int global_gain; + int scalefac_compress; + int window_switching_flag; + int block_type; + int mixed_block_flag; + int table_select[3]; + int subblock_gain[3]; + int region0_count; + int region1_count; + int preflag; + int scalefac_scale; + int count1table_select; +} +GR; +typedef struct +{ + int mode; + int mode_ext; +/*---------------*/ + int main_data_begin; /* beginning, not end, my spec wrong */ + int private_bits; +/*---------------*/ + int scfsi[2]; /* 4 bit flags [ch] */ + GR gr[2][2]; /* [gran][ch] */ +} +SIDE_INFO; + +/*-----------------------------------------------------------*/ +/*-- scale factors ---*/ +// check dimensions - need 21 long, 3*12 short +// plus extra for implicit sf=0 above highest cb +typedef struct +{ + int l[23]; /* [cb] */ + int s[3][13]; /* [window][cb] */ +} +SCALEFACT; + +/*-----------------------------------------------------------*/ +typedef struct +{ + int cbtype; /* long=0 short=1 */ + int cbmax; /* max crit band */ +// int lb_type; /* long block type 0 1 3 */ + int cbs0; /* short band start index 0 3 12 (12=no shorts */ + int ncbl; /* number long cb's 0 8 21 */ + int cbmax_s[3]; /* cbmax by individual short blocks */ +} +CB_INFO; + +/*-----------------------------------------------------------*/ +/* scale factor infor for MPEG2 intensity stereo */ +typedef struct +{ + int nr[3]; + int slen[3]; + int intensity_scale; +} +IS_SF_INFO; + +/*-----------------------------------------------------------*/ +typedef union +{ + int s; + float x; +} +SAMPLE; + +/*-----------------------------------------------------------*/ |