mirror of
https://github.com/QB64Official/qb64.git
synced 2024-09-19 23:44:48 +00:00
253 lines
6.4 KiB
C
253 lines
6.4 KiB
C
#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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#define FALSE 0
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#define TRUE 1
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#define SBLIMIT 32
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#define SSLIMIT 18
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#define SCALE_BLOCK 12 /* Layer 2 */
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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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#ifdef __cplusplus
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extern "C" {
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#endif
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struct StaticData {
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//layer3
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real ispow[8207];
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real aa_ca[8],aa_cs[8];
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real COS1[12][6];
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real win[4][36];
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real win1[4][36];
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real gainpow2[256+118+4];
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real COS9[9];
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real COS6_1,COS6_2;
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real tfcos36[9];
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real tfcos12[3];
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int mapbuf0[9][152];
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int mapbuf1[9][156];
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int mapbuf2[9][44];
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int *map[9][3];
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int *mapend[9][3];
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unsigned int n_slen2[512];
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unsigned int i_slen2[256];
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real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
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real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];
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int longLimit[9][23];
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int shortLimit[9][14];
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real hybridIn[2][SBLIMIT][SSLIMIT];
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real hybridOut[2][SSLIMIT][SBLIMIT];
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//common
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int bitindex;
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unsigned char *wordpointer;
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//decode_i386
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real buffs[2][2][0x110];
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int bo;
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//layer2
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int grp_3tab[32 * 3]; /* used: 27 */
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int grp_5tab[128 * 3]; /* used: 125 */
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int grp_9tab[1024 * 3]; /* used: 729 */
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real muls[27][64]; /* also used by layer 1 */
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unsigned int scfsi_buf[64];
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//tabinit
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real decwin[512+32];
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real cos64[16],cos32[8],cos16[4],cos8[2],cos4[1];
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real *pnts[5];
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};
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/*
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* the ith entry determines the seek point for
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* i-percent duration
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* seek point in bytes = (toc[i]/256.0) * total_bitstream_bytes
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* e.g. half duration seek point = (toc[50]/256.0) * total_bitstream_bytes
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*/
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#define FRAMES_FLAG 0x0001
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#define BYTES_FLAG 0x0002
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#define TOC_FLAG 0x0004
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#define VBR_SCALE_FLAG 0x0008
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#define NUMTOCENTRIES 100
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#define FRAMES_AND_BYTES (FRAMES_FLAG | BYTES_FLAG)
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const static char VBRTag[]={"Xing"};
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/*structure to receive extracted header */
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/* toc may be NULL*/
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typedef struct
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{
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int h_id; /* from MPEG header, 0=MPEG2, 1=MPEG1 */
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int samprate; /* determined from MPEG header */
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int flags; /* from Vbr header data */
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int frames; /* total bit stream frames from Vbr header data */
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int bytes; /* total bit stream bytes from Vbr header data*/
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int vbr_scale; /* encoded vbr scale from Vbr header data*/
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unsigned char toc[NUMTOCENTRIES]; /* may be NULL if toc not desired*/
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} VBRTAGDATA;
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/*
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// 4 bytes for Header Tag
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// 4 bytes for Header Flags
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// 100 bytes for entry (NUMTOCENTRIES)
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// 4 bytes for FRAME SIZE
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// 4 bytes for STREAM_SIZE
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// 4 bytes for VBR SCALE. a VBR quality indicator: 0=best 100=worst
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// 20 bytes for LAME tag. for example, "LAME3.12 (beta 6)"
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// ___________
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// 140 bytes
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*/
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#define VBRHEADERSIZE (NUMTOCENTRIES+4+4+4+4+4)
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int GetVbrTag(VBRTAGDATA *pTagData, unsigned char *buf);
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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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int II_sblimit; /* Layer 2 */
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const struct al_table *alloc; /* Layer 2 */
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int (*do_layer)(struct StaticData * psd, struct mpstr * gmp, struct frame *fr, unsigned char *pcm_sample, int *pcm_point);/* Layer 2 */
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};
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/* extern unsigned int get1bit(void);*/
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extern unsigned int getbits(struct StaticData * psd, int);
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extern unsigned int getbits_fast(struct StaticData * psd, int);
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extern int set_pointer(struct StaticData * psd, struct mpstr * gmp, long backstep);
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extern int do_layer3(struct StaticData * psd, struct mpstr * gmp, struct frame *fr, unsigned char *pcm_sample, int *pcm_point);
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extern int do_layer2(struct StaticData * psd, struct mpstr * gmp, struct frame *fr,unsigned char *,int *);
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extern int head_check(unsigned long head);
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extern int ExtractI4(unsigned char *buf);
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extern int decode_header(struct mpstr *mp, 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 (struct StaticData * psd, struct mpstr * gmp, real *bandPtr,int channel,unsigned char *out,int *pnt);
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extern int tsynth_1to1 (struct StaticData * psd, real *,int,unsigned char *,int *);
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extern int synth_1to1_mono (struct StaticData * psd, struct mpstr * gmp, real *,unsigned char *,int *);
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extern void init_layer3(struct StaticData * psd, int);
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extern void init_layer2(struct StaticData * psd);
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extern void make_decode_tables(struct StaticData * psd, long scaleval);
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extern void dct64(struct StaticData * psd, real *,real *,real *);
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const extern long freqs[9];
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/* Preserves exiting */
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#define BE_QUIET
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/* Windows debugging message */
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void MessageI(int i);
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#ifdef __cplusplus
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}
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#endif
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