mp3audio.h

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/* Copyright 1999, ESS Technology, Inc.					*/
/* SCCSID @(#)mp3audio.h	4.6 03/16/04 */

/*
 * $Log$
 */

#ifndef __MP3AUDIO_H__
#define __MP3AUDIO_H__

#include "common.h"

/* General Definitions */
#define         SBLIMIT                 32
#define         SSLIMIT                 18
#define         CRC16_POLYNOMIAL        0x8005

/* MPEG Header Definitions - Mode Values */
#define         MPG_MD_STEREO           0
#define         MPG_MD_JOINT_STEREO     1
#define         MPG_MD_DUAL_CHANNEL     2
#define         MPG_MD_MONO             3

/* channel selection */
#define 	LEFT_LEFT               0
#define 	RIGHT_RIGHT             1
#define 	LEFT_RIGHT              2       /* stereo */
#define 	LEFT_RIGHT_AVG          3       /* average both channels */

#define         MIN(A, B)       ((A) < (B) ? (A) : (B))
/***********************************************************************
*  Global Type Definitions
***********************************************************************/
/* Layer III side information. */
typedef struct {
    unsigned main_data_begin;
    unsigned private_bits;
    struct {
	unsigned scfsi[4];
	struct gr_info_s {
	    unsigned part2_3_length;
	    unsigned big_values;
	    unsigned global_gain;
	    unsigned scalefac_compress;
	    unsigned window_switching_flag;
	    unsigned block_type;
	    unsigned mixed_block_flag;
	    unsigned table_select[3];
	    unsigned subblock_gain[3];
	    unsigned maxband[3];
	    unsigned maxbandl;
	    unsigned maxb;
	    unsigned region0_count;
	    unsigned region1_count;
	    unsigned preflag;
	    unsigned scalefac_scale;
	    unsigned count1table_select;
	} gr[2];
    } ch[2];
} side_info_t;

/* Layer III scale factors. */
typedef struct {
    int l[23];
    int s[3][13];
} gr_t;
typedef struct {
    gr_t gr[2];                         /* two graunles */
} scalefacs_t[2];  /* [ch] */
/***********************************************************************
 *  Global Variable External Declarations
 ***********************************************************************/
#ifdef MP3_STUD
/* nothing */
#else

#if defined(XSEG4_ON_FLY) || defined(MKTABLE)
ushort sample_rate[6] = {44100, 48000, 32000, 22050, 24000, 16000};

uchar lsfbtable[5] = {0, 6, 11, 16, 21};
uchar ssfbtable[3] = {0, 6, 12}; 

uchar pretab1[22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0};
uchar pretab2[22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

uchar cos36_index[12] = {
    0,4,6,2,16,12,10,14,8,8,8,8
};

uchar cos9_index[3][8] = { 
    {2,4,6,8,10,12,14,16},
    {10,24,6,4,14,22,2,8},
    {14,20,6,24,2,12,10,4}
};

uchar slen[2][16] = {
    {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
    {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
};

uchar win_index[48] = {
    54,56,58,60,52,50,48,46,64,66,68,70,
    42,40,38,36,62,62,62,62,44,44,44,44,
    18,20,22,24,16,14,12,10,28,30,32,34,
     6, 4, 2, 0,26,26,26,26, 8, 8, 8, 8
};

/* 32bits each, most significant first. */
ushort COS6[4] = { 
    0x376c, 0xf5d0, 0x2000, 0x0000
};
ushort COS9[26] = {
    0x4000, 0x0000, 0x3f07, 0x1719, 0x3c23, 0xec84, 0x376c, 0xf5d0, 0x3106,
    0xdf45, 0x2923, 0x6ea4, 0x2000, 0x0000, 0x15e3, 0xa874, 0x0b1d, 0x0d3f,
    0xc3dc, 0x137c, 0xcef9, 0x20bb, 0xe000, 0x0000, 0xf4e2, 0xf2c1
};
ushort COS12[6] = { 
    0x1090, 0x7dc1,0x16a0, 0x9e66,0x3dd1, 0xba8e
};
ushort COS36[18] = {
    0x0403, 0xe958, 0x0424, 0x1f70, 0x0469, 0xdbe6, 0x04e2, 0x12bb, 0x05a8,
    0x2799, 0x06f9, 0x4a1d, 0x0976, 0xfd8c, 0x0f74, 0x6ea3, 0x2de5, 0x1515
};

#ifdef MPEG2_LSF 
ushort longIdx[6][23] = {
    /* MPEG1 */
    {0,4, 8,12,16,20,24,30,36,44,52,62, 74, 90,110,134,162,196,238,288,342,418,576},
    {0,4, 8,12,16,20,24,30,36,42,50,60, 72, 88,106,128,156,190,230,276,330,384,576},
    {0,4, 8,12,16,20,24,30,36,44,54,66, 82,102,126,156,194,240,296,364,448,550,576},
    /* MPEG2_LSF */
    {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
    {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,330,394,464,540,576},
    {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576}
}; 

uchar longDiff[6][22] = {
    /* MPEG1 */
    {4,4,4,4,4,4,6, 6, 8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
    {4,4,4,4,4,4,6, 6, 6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
    {4,4,4,4,4,4,6, 6, 8,10,12,16,20,24,30,38,46,56,68,84,102, 26},
    /* MPEG2_LSF */
    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68, 58, 54},
    {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,52,64,70, 76, 36},
    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68, 58, 54}
};

uchar shortIdx[6][14] = {
    /* MPEG1 */
    {0,4,8,12,16,22,30,40,52,66, 84,106,136,192},
    {0,4,8,12,16,22,28,38,50,64, 80,100,126,192},
    {0,4,8,12,16,22,30,42,58,78,104,138,180,192},
    /* MPEG2_LSF */
    {0,4,8,12,18,24,32,42,56,74,100,132,174,192},
    {0,4,8,12,18,26,36,48,62,80,104,136,180,192},
    {0,4,8,12,18,26,36,48,62,80,104,134,174,192}
};

uchar shortDiff[6][13] = {
    /* MPEG1 */
    {4,4,4,4,6, 8,10,12,14,18,22,30,56},
    {4,4,4,4,6, 6,10,12,14,16,20,26,66},
    {4,4,4,4,6, 8,12,16,20,26,34,42,12},
    /* MPEG2_LSF */
    {4,4,4,6,6, 8,10,14,18,26,32,42,18},
    {4,4,4,6,8,10,12,14,18,24,32,44,12},
    {4,4,4,6,8,10,12,14,18,24,30,40,18}
};
 
/* only MPEG-1 */
/* ====== changed the 1st entries to avoid bad audio to repeat itself ====== */
ushort mp3_framesize[6][15] = {
    /* MPEG1 */
    {4,104,130,156,182,208,261,313,365,417,522,626, 731, 835,1044},
    {4, 96,120,144,168,192,240,288,336,384,480,576, 672, 768, 960},
    {4,144,180,216,252,288,360,432,504,576,720,864,1008,1152,1440},
    /* MPEG2_LSF */
    {4, 26, 52, 78,104,130,156,182,208,261,313,365,417,470,522},
    {4, 24, 48, 72, 96,120,144,168,192,240,288,336,384,432,480},
    {4, 36, 72,108,144,180,216,252,288,360,432,504,576,648,720}
};

uchar stab[3][6][4] = {
    {{ 6, 5, 5, 5}, { 6, 5, 7, 3}, { 11,10,0, 0},
     { 7, 7, 7, 0}, { 6, 6, 6, 3}, {  8, 8,5, 0}},
    {{ 9, 9, 9, 9}, { 9, 9,12, 6}, { 18,18,0, 0},
     {12,12,12, 0}, {12, 9, 9, 6}, { 15,12,9, 0}},
    {{ 6, 9, 9, 9}, { 6, 9,12, 6}, { 15,18,0, 0},
     { 6,15,12, 0}, { 6,12, 9, 6}, {  6,18,9, 0}}
};

#else

ushort longIdx[3][23] = {
    /* MPEG1 */
    {0,4, 8,12,16,20,24,30,36,44,52,62, 74, 90,110,134,162,196,238,288,342,418,576},
    {0,4, 8,12,16,20,24,30,36,42,50,60, 72, 88,106,128,156,190,230,276,330,384,576},
    {0,4, 8,12,16,20,24,30,36,44,54,66, 82,102,126,156,194,240,296,364,448,550,576}
}; 

uchar longDiff[3][22] = {
    /* MPEG1 */
    {4,4,4,4,4,4,6, 6, 8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
    {4,4,4,4,4,4,6, 6, 6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
    {4,4,4,4,4,4,6, 6, 8,10,12,16,20,24,30,38,46,56,68,84,102, 26}
};
uchar shortIdx[3][14] = {
    /* MPEG1 */
    {0,4,8,12,16,22,30,40,52,66, 84,106,136,192},
    {0,4,8,12,16,22,28,38,50,64, 80,100,126,192},
    {0,4,8,12,16,22,30,42,58,78,104,138,180,192}
};

uchar shortDiff[3][13] = {
    /* MPEG1 */
    {4,4,4,4,6, 8,10,12,14,18,22,30,56},
    {4,4,4,4,6, 6,10,12,14,16,20,26,66},
    {4,4,4,4,6, 8,12,16,20,26,34,42,12}
};
 
/* only MPEG-1 */
/* ====== changed the 1st entries to avoid bad audio to repeat itself ====== */
ushort mp3_framesize[3][15] = {
    /* MPEG1 */
    {4,104,130,156,182,208,261,313,365,417,522,626, 731, 835,1044},
    {4, 96,120,144,168,192,240,288,336,384,480,576, 672, 768, 960},
    {4,144,180,216,252,288,360,432,504,576,720,864,1008,1152,1440}
};
#endif

int qua1to3[7] = {
    0x260dfc14, 0x2d413ccc, 0x35d13f32, 0x40000000, 0x260dfc14, 0x2d413ccc,