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Mark Spencer
299
codecs/mp3/include/mhead.h
Executable file
299
codecs/mp3/include/mhead.h
Executable file
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/*____________________________________________________________________________
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FreeAmp - The Free MP3 Player
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MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology
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Corp. http://www.xingtech.com
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Portions Copyright (C) 1998 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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$Id$
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____________________________________________________________________________*/
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/* portable copy of eco\mhead.h */
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/* mpeg audio header */
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typedef struct
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{
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int sync; /* 1 if valid sync */
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int id;
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int option;
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int prot;
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int br_index;
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int sr_index;
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int pad;
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int private_bit;
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int mode;
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int mode_ext;
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int cr;
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int original;
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int emphasis;
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}
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MPEG_HEAD;
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/* portable mpeg audio decoder, decoder functions */
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typedef struct
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{
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int in_bytes;
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int out_bytes;
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}
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IN_OUT;
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typedef struct
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{
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int channels;
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int outvalues;
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long samprate;
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int bits;
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int framebytes;
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int type;
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}
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DEC_INFO;
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typedef IN_OUT(*AUDIO_DECODE_ROUTINE) (void *mv, unsigned char *bs, signed short *pcm);
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typedef IN_OUT(*DECODE_FUNCTION) (void *mv, unsigned char *bs, unsigned char *pcm);
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struct _mpeg;
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typedef struct _mpeg MPEG;
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typedef void (*SBT_FUNCTION_F) (MPEG *m, float *sample, short *pcm, int n);
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/* main data bit buffer */
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#define NBUF (8*1024)
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#define BUF_TRIGGER (NBUF-1500)
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typedef void (*XFORM_FUNCTION) (void *mv, void *pcm, int igr);
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struct _mpeg
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{
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struct {
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float look_c_value[18]; /* built by init */
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unsigned char *bs_ptr;
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unsigned long bitbuf;
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int bits;
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long bitval;
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int outbytes;
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int framebytes;
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int outvalues;
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int pad;
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int stereo_sb;
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DEC_INFO decinfo; /* global for Layer III */
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int max_sb;
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int nsb_limit;
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int first_pass;
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int first_pass_L1;
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int bit_skip;
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int nbat[4];
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int bat[4][16];
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int ballo[64]; /* set by unpack_ba */
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unsigned int samp_dispatch[66]; /* set by unpack_ba */
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float c_value[64]; /* set by unpack_ba */
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unsigned int sf_dispatch[66]; /* set by unpack_ba */
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float sf_table[64];
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float cs_factor[3][64];
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float *sample; /* global for use by Later 3 */
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signed char group3_table[32][3];
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signed char group5_table[128][3];
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signed short group9_table[1024][3];
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SBT_FUNCTION_F sbt;
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AUDIO_DECODE_ROUTINE audio_decode_routine ;
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float *cs_factorL1;
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float look_c_valueL1[16];
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int nbatL1;
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} cup;
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struct {
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/* cupl3.c */
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int nBand[2][22]; /* [long/short][cb] */
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int sfBandIndex[2][22]; /* [long/short][cb] */
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int mpeg25_flag;
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int iframe;
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int band_limit;
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int band_limit21;
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int band_limit12;
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int band_limit_nsb;
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int nsb_limit;
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int gaim_adjust;
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int id;
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int ncbl_mixed;
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int gain_adjust;
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int sr_index;
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int outvalues;
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int outbytes;
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int half_outbytes;
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int framebytes;
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int padframebytes;
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int crcbytes;
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int pad;
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int stereo_flag;
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int nchan;
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int ms_mode;
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int is_mode;
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unsigned int zero_level_pcm;
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CB_INFO cb_info[2][2];
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IS_SF_INFO is_sf_info; /* MPEG-2 intensity stereo */
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unsigned char buf[NBUF];
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int buf_ptr0;
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int buf_ptr1;
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int main_pos_bit;
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SIDE_INFO side_info;
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SCALEFACT sf[2][2]; /* [gr][ch] */
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int nsamp[2][2]; /* must start = 0, for nsamp[igr_prev] */
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float yout[576]; /* hybrid out, sbt in */
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SAMPLE sample[2][2][576];
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SBT_FUNCTION_F sbt_L3;
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XFORM_FUNCTION Xform;
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DECODE_FUNCTION decode_function;
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/* msis.c */
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/*-- windows by block type --*/
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float win[4][36];
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float csa[8][2]; /* antialias */
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float lr[2][8][2]; /* [ms_mode 0/1][sf][left/right] */
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float lr2[2][2][64][2];
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/* l3dq.c */
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float look_global[256 + 2 + 4];
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float look_scale[2][4][32];
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#define ISMAX 32
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float look_pow[2 * ISMAX];
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float look_subblock[8];
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float re_buf[192][3];
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} cupl;
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struct {
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signed int vb_ptr;
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signed int vb2_ptr;
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float vbuf[512];
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float vbuf2[512];
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int first_pass;
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} csbt;
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struct {
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float coef32[31]; /* 32 pt dct coefs */
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} cdct;
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};
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typedef int (*CVT_FUNCTION_8) (void *mv, unsigned char *pcm);
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typedef struct
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{
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struct {
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unsigned char look_u[8192];
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short pcm[2304];
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int ncnt;
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int ncnt1;
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int nlast;
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int ndeci;
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int kdeci;
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int first_pass;
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short xsave;
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CVT_FUNCTION_8 convert_routine;
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} dec;
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MPEG cupper;
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}
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MPEG8;
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#include "itype.h"
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typedef void (*SBT_FUNCTION) (SAMPLEINT * sample, short *pcm, int n);
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typedef void (*UNPACK_FUNCTION) ();
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typedef struct
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{
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struct {
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DEC_INFO decinfo;
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int pad;
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int look_c_value[18]; /* built by init */
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int look_c_shift[18]; /* built by init */
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int outbytes;
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int framebytes;
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int outvalues;
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int max_sb;
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int stereo_sb;
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int nsb_limit;
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int bit_skip;
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int nbat[4];
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int bat[4][16];
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int ballo[64]; /* set by unpack_ba */
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unsigned int samp_dispatch[66]; /* set by unpack_ba */
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int c_value[64]; /* set by unpack_ba */
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int c_shift[64]; /* set by unpack_ba */
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unsigned int sf_dispatch[66]; /* set by unpack_ba */
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int sf_table[64];
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INT32 cs_factor[3][64];
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SAMPLEINT sample[2304];
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signed char group3_table[32][3];
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signed char group5_table[128][3];
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signed short group9_table[1024][3];
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int nsbt;
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SBT_FUNCTION sbt;
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UNPACK_FUNCTION unpack_routine;
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unsigned char *bs_ptr;
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UINT32 bitbuf;
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int bits;
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INT32 bitval;
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int first_pass;
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int first_pass_L1;
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int nbatL1;
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INT32 *cs_factorL1;
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int look_c_valueL1[16]; /* built by init */
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int look_c_shiftL1[16]; /* built by init */
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} iup;
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}
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MPEGI;
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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void mpeg_init(MPEG *m);
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int head_info(unsigned char *buf, unsigned int n, MPEG_HEAD * h);
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int head_info2(unsigned char *buf,
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unsigned int n, MPEG_HEAD * h, int *br);
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int head_info3(unsigned char *buf, unsigned int n, MPEG_HEAD *h, int*br, unsigned int *searchForward);
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/* head_info returns framebytes > 0 for success */
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/* audio_decode_init returns 1 for success, 0 for fail */
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/* audio_decode returns in_bytes = 0 on sync loss */
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int audio_decode_init(MPEG *m, MPEG_HEAD * h, int framebytes_arg,
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int reduction_code, int transform_code, int convert_code,
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int freq_limit);
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void audio_decode_info(MPEG *m, DEC_INFO * info);
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IN_OUT audio_decode(MPEG *m, unsigned char *bs, short *pcm);
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void mpeg8_init(MPEG8 *m);
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int audio_decode8_init(MPEG8 *m, MPEG_HEAD * h, int framebytes_arg,
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int reduction_code, int transform_code, int convert_code,
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int freq_limit);
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void audio_decode8_info(MPEG8 *m, DEC_INFO * info);
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IN_OUT audio_decode8(MPEG8 *m, unsigned char *bs, short *pcmbuf);
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/*-- integer decode --*/
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void i_mpeg_init(MPEGI *m);
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int i_audio_decode_init(MPEGI *m, MPEG_HEAD * h, int framebytes_arg,
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int reduction_code, int transform_code, int convert_code,
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int freq_limit);
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void i_audio_decode_info(MPEGI *m, DEC_INFO * info);
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IN_OUT i_audio_decode(MPEGI *m, unsigned char *bs, short *pcm);
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#ifdef __cplusplus
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}
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#endif
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