rom_dec.h

ffmpeg源码分析

/*
 * ===================================================================
 *  TS 26.104
 *  REL-5 V5.4.0 2004-03
 *  REL-6 V6.1.0 2004-03
 *  3GPP AMR Floating-point Speech Codec
 * ===================================================================
 *
 */

/*
 * rom_dec.h
 *
 *
 * Project:
 *    AMR Floating-Point Codec
 *
 * Contains:
 *    This file contains all the tables needed by AMR decoder functions.
 *
 */

#ifndef _ROM_DEC_H_
#define _ROM_DEC_H_

/*
 * include files
 */
#include"typedef.h"
#include"interf_rom.h"

/*
 * definition of constants
 */
#define M               10      /* Order of LP filter */
#define MP1             (M+1)   /* Order of LP filter + 1 */
#define L_WINDOW        240     /* Window size in LP analysis */
#define L_NEXT          40      /* Overhead in LP analysis */
#define LTPG_MEM_SIZE   5       /* number of stored past LTP coding gains + 1 */
#define N_FRAME         7       /* old pitch gains in average calculation */
#define DTX_HIST_SIZE   8       /* DTX history size */
#define L_TOTAL         320     /* Total size of speech buffer. */
#define L_FRAME         160     /* Frame size */
#define L_FRAME_BY2     80      /* Frame size divided by 2 */
#define L_SUBFR         40      /* Subframe size */
#define L_CODE          40      /* codevector length */
#define PIT_MAX         143     /* Maximum pitch lag */
#define PIT_MIN         20      /* Minimum pitch lag */
#define PIT_MIN_MR122   18      /* Minimum pitch lag (MR122 mode) */
#define L_INTERPOL      (10+1)  /* Length of filter for interpolation */
#define NPRED 4                 /* number of prediction taps */
#define SHARPMIN  0             /* Minimum value of pitch sharpening */
#define MAX_PRM_SIZE    57      /* max. num. of params */
#define L_INTER_SRCH    4           /* Length of filter for CL LTP search interpolation */
#define GP_CLIP         0.95F   /* Pitch gain clipping */
#define UP_SAMP_MAX     6
#define NB_TRACK        5       /* number of tracks */
#define NB_TRACK_MR102  4       /* number of tracks mode mr102 */
#define STEP            5       /* codebook step size */
#define STEP_MR102      4       /* codebook step size mode mr102 */
#define NC              M/2     /* Order of LP filter divided by 2 */

/* vad */
#define COMPLEN               9        /* Number of sub-bands used by VAD */
#define L_ENERGYHIST          60
#define L_CBGAINHIST          7
#define PHDGAINMEMSIZE        5
#define MIN_ENERGY            -14336   /* 14 Q10 */
#define MIN_ENERGY_MR122      -2381    /* 14 / (20*log10(2)) Q10 */
#define PN_INITIAL_SEED       0x70816958L /* Pseudo noise generator seed value  */
#define MIN_16                (Word16)-32768
#define MAX_16                (Word16)0x7fff
#define MAX_32                (Word32)0x7fffffffL
#define EXPCONST              5243     /* 0.16 in Q15 */
#define DTX_MAX_EMPTY_THRESH  50
#define DTX_ELAPSED_FRAMES_THRESH (24 + 7 -1)
#define LSF_GAP               205      /* Minimum distance between LSF after quantization; 50 Hz = 205 */
#define LSP_PRED_FAC_MR122    21299    /* MR122 LSP prediction factor (0.65 Q15) */
#define POS_CODE              8191
#define NEG_CODE              8191
#define NMAX                  9        /* largest N used in median calculation */
#define MEAN_ENER_MR122       783741L  /* 36/(20*log10(2)) (Q17) */
#define SHARPMAX              13017    /* Maximum value of pitch sharpening */
#define FRAMEENERGYLIMIT      17578    /* 150 */
#define LOWERNOISELIMIT       20       /*  5 */
#define UPPERNOISELIMIT       1953     /* 50 */
#define AZ_SIZE               (4*M+4)  /* Size of array of LP filters in 4 subfr.s */
#define AGC_FAC               29491    /* Factor for automatic gain control 0.9 */
#define PHDGAINMEMSIZE        5
#define PHDTHR1LTP            9830     /* 0.6 in Q14 */
#define PHDTHR2LTP            14746    /* 0.9 in Q14 */
#define ONFACTPLUS1           16384    /* 2.0 in Q13 */
#define ONLENGTH              2
#define DTX_HANG_CONST        7        /* yields eight frames of SP HANGOVER */

/* number of parameters */
#define PRMNO_MR475 17
#define PRMNO_MR515 19
#define PRMNO_MR59  19
#define PRMNO_MR67  19
#define PRMNO_MR74  19
#define PRMNO_MR795 23
#define PRMNO_MR102 39
#define PRMNO_MR122 57
#define PRMNO_MRDTX 5

/*
 * tables
 */

/* level adjustment for different modes Q11 */
static const Word16 dtx_log_en_adjust[9] =
{
   - 1023,
   /* MR475 */ - 878,
   /* MR515 */ - 732,
   /* MR59  */ - 586,
   /* MR67  */ - 440,
   /* MR74  */ - 294,
   /* MR795 */ - 148,
   /* MR102 */ 0,
   /* MR122 */ 0,
   /* MRDTX */
};

/* attenuation factors for codebook gain */
static const Word32 cdown[7] =
   {
      32767,
      32112,
      32112,
      32112,
      32112,
      32112,
      22937
   };

/* attenuation factors for adaptive codebook gain */
static const Word32 pdown[7] =
   {
      32767,
      32112,
      32112,
      26214,
      9830,
      6553,
      6553
   };

/* algebraic code book gain MA predictor coefficients */
static const Word32 pred[NPRED] =
{
   5571,
   4751,
   2785,
   1556
};

/* algebraic code book gain MA predictor coefficients (MR122) */
static const Word32 pred_MR122[NPRED] =
{
   44,
   37,
   22,
   12
};

static const Word32 gamma4_gamma3_MR122[M] =
{
   22938,
   16057,
   11240,
   7868,
   5508,
   3856,
   2699,
   1889,
   1322,
   925
};
static const Word32 gamma3[M] =
{
   18022,
   9912,
   5451,
   2998,
   1649,
   907,
   499,
   274,
   151,
   83
};
static const Word32 gamma4_MR122[M] =
{
   24576,
   18432,
   13824,
   10368,
   7776,
   5832,
   4374,
   3281,
   2461,
   1846
};


/* adaptive codebook gain quantization table (MR122, MR795) */
#define NB_QUA_PITCH 16
static const Word32 qua_gain_pitch[NB_QUA_PITCH] =
{
   0,
   3277,
   6556,
   8192,
   9830,
   11469,
   12288,
   13107,
   13926,
   14746,
   15565,
   16384,
   17203,
   18022,
   18842,
   19661
};

/* fixed codebook gain quantization table (MR122, MR795) */
#define NB_QUA_CODE 32
static const Word32 qua_gain_code[NB_QUA_CODE * 3] =
{
/* gain factor (g_fac) and quantized energy error (qua_ener_MR122, qua_ener)
 * are stored:
 *
 * qua_ener_MR122 = log2(g_fac)      (not the rounded floating point value, but
 *                                    the value the original EFR algorithm
 *                                    calculates from g_fac [using Log2])
 * qua_ener       = 20*log10(g_fac); (rounded floating point value)
 *
 *
 * g_fac (Q11),
 * qua_ener_MR122 (Q10),
 * qua_ener (Q10)
 */ 159,
   - 3776,
   - 22731,
   206,
   - 3394,
   - 20428,
   268,
   - 3005,
   - 18088,
   349,
   - 2615,
   - 15739,
   419,
   - 2345,
   - 14113,
   482,
   - 2138,
   - 12867,
   554,
   - 1932,
   - 11629,
   637,
   - 1726,
   - 10387,
   733,
   - 1518,
   - 9139,
   842,
   - 1314,
   - 7906,
   969,
   - 1106,
   - 6656,
   1114,
   - 900,
   - 5416,
   1281,
   - 694,
   - 4173,
   1473,
   - 487,
   - 2931,
   1694,
   - 281,
   - 1688,
   1948,
   - 75,
   - 445,
   2241,
   133,
   801,
   2577,
   339,
   2044,
   2963,
   545,
   3285,
   3408,
   752,
   4530,
   3919,
   958,
   5772,
   4507,
   1165,
   7016,
   5183,
   1371,
   8259,
   5960,
   1577,
   9501,
   6855,
   1784,
   10745,
   7883,
   1991,
   11988,
   9065,
   2197,
   13231,
   10425,
   2404,
   14474,
   12510,
   2673,
   16096,
   16263,
   3060,
   18429,
   21142,
   3448,
   20763,
   27485,
   3836,
   23097
};

/* gray coding table */
static const Word8 gray[8] =
{
   0,
   1,
   3,
   2,
   6,
   4,
   5,
   7
};

/* gray decoding table */
static const Word32 dgray[8] =
{
   0,
   1,
   3,
   2,
   5,
   6,
   4,
   7
};

/* table[i] = sqrt((i+16)*2^-6) * 2^15, i.e. sqrt(x) scaled Q15 */
static const Word32 sqrt_table[49] =
{
   16384,
   16888,
   17378,
   17854,
   18318,
   18770,
   19212,
   19644,
   20066,
   20480,
   20886,
   21283,
   21674,
   22058,
   22435,
   22806,
   23170,
   23530,
   23884,
   24232,
   24576,
   24915,
   25249,
   25580,
   25905,
   26227,
   26545,
   26859,
   27170,
   27477,
   27780,
   28081,
   28378,
   28672,
   28963,
   29251,
   29537,
   29819,
   30099,
   30377,
   30652,
   30924,
   31194,
   31462,
   31727,
   31991,
   32252,
   32511,
   32767
};

static const Word32 inv_sqrt_table[49] =
{
   32767,
   31790,
   30894,
   30070,
   29309,
   28602,
   27945,
   27330,
   26755,
   26214,
   25705,
   25225,
   24770,
   24339,
   23930,
   23541,
   23170,
   22817,
   22479,
   22155,
   21845,
   21548,
   21263,
   20988,
   20724,
   20470,
   20225,
   19988,
   19760,
   19539,
   19326,
   19119,
   18919,
   18725,
   18536,
   18354,
   18176,
   18004,
   17837,
   17674,
   17515,
   17361,
   17211,
   17064,
   16921,
   16782,
   16646,
   16514,
   16384
};
/* table used inbase 2 logharithm computation */
static const Word32 log2_table[33] =
{
   0,
   1455,
   2866,
   4236,
   5568,
   6863,
   8124,
   9352,
   10549,
   11716,
   12855,
   13967,
   15054,
   16117,
   17156,
   18172,
   19167,
   20142,
   21097,
   22033,
   22951,
   23852,
   24735,
   25603,
   26455,
   27291,
   28113,
   28922,
   29716,
   30497,
   31266,
   32023,
   32767
};

/* table used in 2 to the power computation */
static const Word32 pow2_table[33] =
{
   16384,
   16743,
   17109,
   17484,
   17867,
   18258,
   18658,
   19066,
   19484,
   19911,
   20347,
   20792,
   21247,
   21713,
   22188,
   22674,
   23170,
   23678,
   24196,
   24726,
   25268,
   25821,
   26386,
   26964,
   27554,
   28158,
   28774,
   29405,
   30048,
   30706,
   31379,
   32066,
   32767
};

/* table of cos(x) */
static const Word32 cos_table[65] =
{
   32767,
   32729,
   32610,
   32413,
   32138,
   31786,
   31357,
   30853,
   30274,
   29622,
   28899,
   28106,
   27246,
   26320,
   25330,
   24279,
   23170,
   22006,
   20788,
   19520,
   18205,
   16846,
   15447,
   14010,
   12540,
   11039,
   9512,
   7962,
   6393,
   4808,
   3212,
   1608,
   0,
   - 1608,
   - 3212,
   - 4808,
   - 6393,
   - 7962,
   - 9512,
   - 11039,
   - 12540,
   - 14010,
   - 15447,
   - 16846,
   - 18205,
   - 19520,
   - 20788,
   - 22006,
   - 23170,
   - 24279,
   - 25330,
   - 26320,
   - 27246,
   - 28106,
   - 28899,
   - 29622,
   - 30274,
   - 30853,
   - 31357,
   - 31786,
   - 32138,
   - 32413,
   - 32610,
   - 32729,
   - 32768
};

/* slope used to compute y = acos(x) */
static const Word32 acos_slope[64] =
{
   - 26887,
   - 8812,
   - 5323,
   - 3813,
   - 2979,
   - 2444,
   - 2081,
   - 1811,
   - 1608,
   - 1450,
   - 1322,
   - 1219,
   - 1132,
   - 1059,
   - 998,
   - 946,
   - 901,
   - 861,
   - 827,
   - 797,
   - 772,
   - 750,
   - 730,
   - 713,
   - 699,
   - 687,
   - 677,
   - 668,
   - 662,
   - 657,
   - 654,
   - 652,
   - 652,
   - 654,
   - 657,
   - 662,
   - 668,
   - 677,
   - 687,
   - 699,
   - 713,
   - 730,
   - 750,
   - 772,
   - 797,
   - 827,
   - 861,
   - 901,
   - 946,
   - 998,
   - 1059,
   - 1132,
   - 1219,
   - 1322,
   - 1450,
   - 1608,
   - 1811,
   - 2081,
   - 2444,
   - 2979,
   - 3813,
   - 5323,
   - 8812,
   - 26887
};

/* All impulse responses are in Q15 */
/* phase dispersion impulse response (MR795) */
static const Word32 ph_imp_low_MR795[] =
{
   26777,
   801,
   2505,
   - 683,
   - 1382,
   582,
   604,
   - 1274,
   3511,
   - 5894,
   4534,
   - 499,
   - 1940,
   3011,
   - 5058,
   5614,
   - 1990,
   - 1061,
   - 1459,
   4442,
   - 700,
   - 5335,
   4609,
   452,
   - 589,
   - 3352,
   2953,
   1267,
   - 1212,
   - 2590,
   1731,
   3670,
   - 4475,
   - 975,
   4391,
   - 2537,
   949,
   - 1363,
   - 979,
   5734
};
/* phase dispersion impulse response (MR795) */
static const Word32 ph_imp_mid_MR795[] =
{
   30274,
   3831,
   - 4036,
   2972,
   - 1048,
   - 1002,
   2477,
   - 3043,
   2815,
   - 2231,
   1753,
   - 1611,
   1714,
   - 1775,
   1543,
   - 1008,
   429,
   - 169,
   472,
   - 1264,
   2176,
   - 2706,
   2523,
   - 1621,
   344,
   826,
   - 1529,
   1724,
   - 1657,
   1701,
   - 2063,
   2644,
   - 3060,
   2897,
   - 1978,
   557,
   780,
   - 1369,
   842,
   655
};

/* phase dispersion impulse response (MR475 - MR67) */
static const Word32 ph_imp_low[] =
{
   14690,
   11518,
   1268,
   - 2761,
   - 5671,
   7514,
   - 35,
   - 2807,
   - 3040,
   4823,
   2952,
   - 8424,
   3785,
   1455,
   2179,
   - 8637,
   8051,
   - 2103,
   - 1454,
   777,
   1108,
   - 2385,
   2254,
   - 363,
   - 674,
   - 2103,
   6046,
   - 5681,
   1072,
   3123,
   - 5058,
   5312,
   - 2329,
   - 3728,
   6924,
   - 3889,
   675,
   - 1775,
   29,
   10145
};

/* phase dispersion impulse response (MR475 - MR67) */
static const Word32 ph_imp_mid[] =
{
   30274,
   3831,
   - 4036,
   2972,
   - 1048,
   - 1002,
   2477,
   - 3043,
   2815,
   - 2231,
   1753,
   - 1611,
   1714,
   - 1775,
   1543,
   - 1008,
   429,
   - 169,
   472,
   - 1264,
   2176,
   - 2706,
   2523,
   - 1621,
   344,
   826,
   - 1529,
   1724,
   - 1657,
   1701,
   - 2063,
   2644,
   - 3060,
   2897,
   - 1978,
   557,
   780,
   - 1369,
   842,
   655
};

/* initialization table for the MA predictor in DTX */
#define PAST_RQ_INIT_SIZE 8

/* initalization table for MA predictor in dtx mode */
static const Word32 past_rq_init[80] =
{
   - 258,
   - 318,
   - 439,
   - 634,
   - 656,
   - 773,
   - 711,
   - 502,
   - 268,
   - 193,
   - 2,
   125,
   122,
   - 39,
   - 9,
   105,
   129,
   283,
   372,
   575,
   - 277,
   - 324,
   - 197,
   - 487,
   - 445,
   - 362,
   - 292,
   - 27,
   177,
   543,
   342,
   517,
   516,
   130,
   27,
   - 104,
   - 120,
   - 140,
   - 74,
   - 56,
   - 564,
   - 943,
   - 1520,
   - 965,
   - 814,
   - 526,
   - 322,
   - 2,
   159,
   657,
   - 312,
   - 284,
   - 386,
   - 597,
   - 493,
   - 526,
   - 418,
   - 229,
   105,
   449,
   - 557,
   - 870,
   - 1075,
   - 919,
   - 950,
   - 752,
   - 709,
   - 316,
   62,
   486,
   - 314,
   - 191,
   - 203,
   - 330,
   - 160,
   - 103,
   - 51,
   131,
   338,
   515
};

#define ALPHA     29491
#define ONE_ALPHA 3277
/* LSF means (not in MR122) */
static const Word32 mean_lsf_3[10] =
{
   1546,
   2272,
   3778,
   5488,
   6972,
   8382,
   10047,
   11229,
   12766,
   13714
};

#define ALPHA_122     31128
#define ONE_ALPHA_122 1639
/* LSF means ->normalize frequency domain */
static const Word32 mean_lsf_5[10] =
{
   1384,
   2077,
   3420,
   5108,
   6742,
   8122,
   9863,
   11092,
   12714,
   13701
};

/* LSF prediction factors (not in MR122) */
static const Word32 pred_fac[10] =
{
   9556,
   10769,
   12571,
   13292,
   14381,
   11651,
   10588,
   9767,
   8593,
   6484
};
#define DICO1_SIZE_3  256
#define DICO2_SIZE_3  512
#define DICO3_SIZE_3  512

/* 1st LSF quantizer (not in MR122 and MR795) */
static const Word32 dico1_lsf_3[] =
{
   6,
   82,
   - 131,
   154,
   - 56,
   - 735,
   183,
   - 65,
   - 265,
   9,
   - 210,
   - 361,
   113,
   718,
   1817,
   1010,
   1214,
   1573,
   857,
   1333,
   2276,
   827,
   1568,
   1933,
   717,
   1989,
   2206,
   838,
   1172,
   1823,
   721,
   1000,
   2154,
   286,
   476,
   1509,
   - 247,
   - 531,
   230,
   147,
   - 82,
   569,
   26,
   - 177,
   - 944,
   - 27,
   - 273,
   692,
   - 164,
   - 264,
   - 183,
   224,
   790,
   1039,
   899,
   946,
   601,
   485,
   771,
   1150,
   524,
   677,
   903,
   - 140,
   375,
   778,
   410,
   676,
   429,
   301,
   530,
   1009,
   719,
   646,
   38,
   226,
   367,
   40,
   145,
   - 45,
   - 505,
   290,
   121,
   - 121,
   302,
   127,
   166,
   - 124,
   - 383,
   - 956,
   - 358,
   - 455,
   - 977,
   715,
   878,
   894,
   978,
   923,
   211,
   477,
   272,
   64,
   188,
   - 78,
   17,
   - 143,
   - 65,
   38,
   643,
   586,
   621,
   - 134,
   - 426,
   - 651,
   347,
   545,
   2820,
   1188,
   2726,
   2442,
   142,
   - 80,
   1735,
   283,
   130,
   461,
   - 262,
   - 399,
   - 1145,
   - 411,
   155,
   430,
   329,
   375,
   779,
   53,
   - 226,
   - 139,
   - 129,
   - 236,
   1682,
   285,
   744,
   1327,
   738,
   697,
   1664,
   312,
   409,
   266,
   325,
   720,
   135,
   1,
   221,
   453,
   8,
   203,
   145,
   299,
   640,
   760,
   29,
   468,
   638,
   103,
   429,
   379,
   420,
   954,
   932,
   1326,
   1210,