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187 lines
4.1 KiB
C
187 lines
4.1 KiB
C
/*____________________________________________________________________________
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FreeAmp - The Free MP3 Player
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MP3 Decoder originally Copyright (C) 1996-1997 Xing Technology
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Corp. http://www.xingtech.com
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Portions Copyright (C) 1998-1999 Emusic.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: L3.h,v 1.7 1999/12/10 07:16:42 elrod Exp $
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____________________________________________________________________________*/
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/**** L3.h ***************************************************
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Layer III structures
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*** Layer III is 32 bit only ***
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*** Layer III code assumes 32 bit int ***
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******************************************************************/
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#ifndef L3_H
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#define L3_H
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#include "config.h"
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#define GLOBAL_GAIN_SCALE (4*15)
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/* #define GLOBAL_GAIN_SCALE 0 */
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#ifdef _M_IX86
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#define LITTLE_ENDIAN 1
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#endif
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#ifdef _M_ALPHA
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#define LITTLE_ENDIAN 1
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#endif
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#ifdef sparc
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#define LITTLE_ENDIAN 0
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#endif
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#if defined(__POWERPC__)
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#define LITTLE_ENDIAN 0
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#elif defined(__INTEL__)
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#define LITTLE_ENDIAN 1
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#endif
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#ifndef LITTLE_ENDIAN
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#error Layer III LITTLE_ENDIAN must be defined 0 or 1
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#endif
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/*-----------------------------------------------------------*/
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/*---- huffman lookup tables ---*/
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/* endian dependent !!! */
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#if LITTLE_ENDIAN
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typedef union
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{
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int ptr;
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struct
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{
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unsigned char signbits;
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unsigned char x;
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unsigned char y;
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unsigned char purgebits; // 0 = esc
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}
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b;
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}
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HUFF_ELEMENT;
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#else /* big endian machines */
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typedef union
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{
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int ptr; /* int must be 32 bits or more */
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struct
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{
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unsigned char purgebits; // 0 = esc
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unsigned char y;
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unsigned char x;
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unsigned char signbits;
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}
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b;
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}
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HUFF_ELEMENT;
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#endif
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/*--------------------------------------------------------------*/
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typedef struct
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{
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unsigned int bitbuf;
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int bits;
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unsigned char *bs_ptr;
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unsigned char *bs_ptr0;
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unsigned char *bs_ptr_end; // optional for overrun test
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}
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BITDAT;
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/*-- side info ---*/
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typedef struct
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{
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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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int window_switching_flag;
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int block_type;
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int mixed_block_flag;
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int table_select[3];
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int subblock_gain[3];
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int region0_count;
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int region1_count;
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int preflag;
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int scalefac_scale;
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int count1table_select;
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}
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GR;
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typedef struct
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{
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int mode;
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int mode_ext;
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/*---------------*/
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int main_data_begin; /* beginning, not end, my spec wrong */
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int private_bits;
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/*---------------*/
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int scfsi[2]; /* 4 bit flags [ch] */
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GR gr[2][2]; /* [gran][ch] */
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}
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SIDE_INFO;
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/*-----------------------------------------------------------*/
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/*-- scale factors ---*/
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// check dimensions - need 21 long, 3*12 short
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// plus extra for implicit sf=0 above highest cb
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typedef struct
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{
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int l[23]; /* [cb] */
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int s[3][13]; /* [window][cb] */
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}
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SCALEFACT;
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/*-----------------------------------------------------------*/
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typedef struct
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{
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int cbtype; /* long=0 short=1 */
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int cbmax; /* max crit band */
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// int lb_type; /* long block type 0 1 3 */
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int cbs0; /* short band start index 0 3 12 (12=no shorts */
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int ncbl; /* number long cb's 0 8 21 */
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int cbmax_s[3]; /* cbmax by individual short blocks */
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}
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CB_INFO;
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/*-----------------------------------------------------------*/
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/* scale factor infor for MPEG2 intensity stereo */
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typedef struct
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{
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int nr[3];
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int slen[3];
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int intensity_scale;
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}
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IS_SF_INFO;
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#ifndef SAMPLE
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#include "small_header.h"
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#endif
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/*-----------------------------------------------------------*/
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#endif // #ifndef L3_H
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