210 lines
5.7 KiB
C
210 lines
5.7 KiB
C
/*
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* Copyright (c) Michael Hipp and other authors of the mpglib project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#ifndef WIN32
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#include <sys/signal.h>
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#include <unistd.h>
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#endif
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#include <math.h>
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#ifdef _WIN32
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# undef WIN32
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# define WIN32
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# define M_PI 3.14159265358979323846
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# define M_SQRT2 1.41421356237309504880
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# define REAL_IS_FLOAT
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# define NEW_DCT9
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# define random rand
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# define srandom srand
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#endif
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#ifdef REAL_IS_FLOAT
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# define real float
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#elif defined(REAL_IS_LONG_DOUBLE)
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# define real long double
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#else
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# define real double
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#endif
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#ifdef __GNUC__
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#define INLINE inline
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#else
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#define INLINE
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#endif
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/* AUDIOBUFSIZE = n*64 with n=1,2,3 ... */
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#define AUDIOBUFSIZE 16384
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef FALSE
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#define TRUE 1
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#endif
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#define SBLIMIT 32
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#define SSLIMIT 18
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#define SCALE_BLOCK 12
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#define MPG_MD_STEREO 0
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#define MPG_MD_JOINT_STEREO 1
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#define MPG_MD_DUAL_CHANNEL 2
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#define MPG_MD_MONO 3
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#define MAXFRAMESIZE 1792
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/* Pre Shift fo 16 to 8 bit converter table */
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#define AUSHIFT (3)
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struct frame {
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int stereo;
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int jsbound;
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int single;
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int lsf;
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int mpeg25;
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int header_change;
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int lay;
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int error_protection;
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int bitrate_index;
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int sampling_frequency;
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int padding;
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int extension;
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int mode;
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int mode_ext;
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int copyright;
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int original;
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int emphasis;
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int framesize; /* computed framesize */
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/* layer2 stuff */
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int II_sblimit;
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const struct al_table *alloc;
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};
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struct parameter {
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int quiet; /* shut up! */
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int tryresync; /* resync stream after error */
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int verbose; /* verbose level */
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int checkrange;
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};
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extern unsigned int get1bit(void);
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extern unsigned int getbits(int);
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extern unsigned int getbits_fast(int);
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extern int set_pointer(long);
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extern unsigned char *wordpointer;
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extern int bitindex;
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extern void make_decode_tables(long scaleval);
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extern int do_layer3(struct frame *fr,unsigned char *,int *);
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extern int do_layer2(struct frame *fr,unsigned char *,int *);
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extern int do_layer1(struct frame *fr,unsigned char *,int *);
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extern int decode_header(struct frame *fr,unsigned long newhead);
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struct gr_info_s {
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int scfsi;
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unsigned part2_3_length;
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unsigned big_values;
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unsigned scalefac_compress;
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unsigned block_type;
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unsigned mixed_block_flag;
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unsigned table_select[3];
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unsigned subblock_gain[3];
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unsigned maxband[3];
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unsigned maxbandl;
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unsigned maxb;
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unsigned region1start;
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unsigned region2start;
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unsigned preflag;
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unsigned scalefac_scale;
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unsigned count1table_select;
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real *full_gain[3];
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real *pow2gain;
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};
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struct III_sideinfo
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{
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unsigned main_data_begin;
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unsigned private_bits;
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struct {
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struct gr_info_s gr[2];
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} ch[2];
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};
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extern int synth_1to1 (real *,int,unsigned char *,int *);
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extern int synth_1to1_8bit (real *,int,unsigned char *,int *);
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extern int synth_1to1_mono (real *,unsigned char *,int *);
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extern int synth_1to1_mono2stereo (real *,unsigned char *,int *);
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extern int synth_1to1_8bit_mono (real *,unsigned char *,int *);
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extern int synth_1to1_8bit_mono2stereo (real *,unsigned char *,int *);
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extern int synth_2to1 (real *,int,unsigned char *,int *);
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extern int synth_2to1_8bit (real *,int,unsigned char *,int *);
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extern int synth_2to1_mono (real *,unsigned char *,int *);
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extern int synth_2to1_mono2stereo (real *,unsigned char *,int *);
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extern int synth_2to1_8bit_mono (real *,unsigned char *,int *);
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extern int synth_2to1_8bit_mono2stereo (real *,unsigned char *,int *);
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extern int synth_4to1 (real *,int,unsigned char *,int *);
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extern int synth_4to1_8bit (real *,int,unsigned char *,int *);
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extern int synth_4to1_mono (real *,unsigned char *,int *);
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extern int synth_4to1_mono2stereo (real *,unsigned char *,int *);
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extern int synth_4to1_8bit_mono (real *,unsigned char *,int *);
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extern int synth_4to1_8bit_mono2stereo (real *,unsigned char *,int *);
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extern int synth_ntom (real *,int,unsigned char *,int *);
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extern int synth_ntom_8bit (real *,int,unsigned char *,int *);
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extern int synth_ntom_mono (real *,unsigned char *,int *);
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extern int synth_ntom_mono2stereo (real *,unsigned char *,int *);
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extern int synth_ntom_8bit_mono (real *,unsigned char *,int *);
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extern int synth_ntom_8bit_mono2stereo (real *,unsigned char *,int *);
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extern void rewindNbits(int bits);
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extern int hsstell(void);
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extern int get_songlen(struct frame *fr,int no);
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extern void init_layer3(int);
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extern void init_layer2(void);
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extern void make_decode_tables(long scale);
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extern void make_conv16to8_table(int);
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extern void dct64(real *,real *,real *);
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extern void synth_ntom_set_step(long,long);
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extern unsigned char *conv16to8;
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extern const long freqs[9];
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extern real muls[27][64];
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extern real decwin[512+32];
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extern real *pnts[5];
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extern const struct parameter param;
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