annotate ffmpeg/libavcodec/g729data.h @ 13:844d341cf643 tip

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/*
 * data for G.729, G729 Annex D decoders
 * Copyright (c) 2007 Vladimir Voroshilov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_G729DATA_H
#define AVCODEC_G729DATA_H

#include <stdint.h>

#define MA_NP                4  ///< Moving Average (MA) prediction order

#define VQ_1ST_BITS          7  ///< first stage vector of quantizer (size in bits)
#define VQ_2ND_BITS          5  ///< second stage vector of quantizer (size in bits)

#define GC_1ST_IDX_BITS_8K   3  ///< gain codebook (first stage) index, 8k mode (size in bits)
#define GC_2ND_IDX_BITS_8K   4  ///< gain codebook (second stage) index, 8k mode (size in bits)

#define GC_1ST_IDX_BITS_6K4  3  ///< gain codebook (first stage) index, 6.4k mode (size in bits)
#define GC_2ND_IDX_BITS_6K4  3  ///< gain codebook (second stage) index, 6.4k mode (size in bits)

/**
 * first stage LSP codebook
 * (10-dimensional, with 128 entries (3.24 of G.729)
 */
static const int16_t cb_lsp_1st[1<<VQ_1ST_BITS][10] = { /* (2.13) */
  { 1486,  2168,  3751,  9074, 12134, 13944, 17983, 19173, 21190, 21820},
  { 1730,  2640,  3450,  4870,  6126,  7876, 15644, 17817, 20294, 21902},
  { 1568,  2256,  3088,  4874, 11063, 13393, 18307, 19293, 21109, 21741},
  { 1733,  2512,  3357,  4708,  6977, 10296, 17024, 17956, 19145, 20350},
  { 1744,  2436,  3308,  8731, 10432, 12007, 15614, 16639, 21359, 21913},
  { 1786,  2369,  3372,  4521,  6795, 12963, 17674, 18988, 20855, 21640},
  { 1631,  2433,  3361,  6328, 10709, 12013, 13277, 13904, 19441, 21088},
  { 1489,  2364,  3291,  6250,  9227, 10403, 13843, 15278, 17721, 21451},
  { 1869,  2533,  3475,  4365,  9152, 14513, 15908, 17022, 20611, 21411},
  { 2070,  3025,  4333,  5854,  7805,  9231, 10597, 16047, 20109, 21834},
  { 1910,  2673,  3419,  4261, 11168, 15111, 16577, 17591, 19310, 20265},
  { 1141,  1815,  2624,  4623,  6495,  9588, 13968, 16428, 19351, 21286},
  { 2192,  3171,  4707,  5808, 10904, 12500, 14162, 15664, 21124, 21789},
  { 1286,  1907,  2548,  3453,  9574, 11964, 15978, 17344, 19691, 22495},
  { 1921,  2720,  4604,  6684, 11503, 12992, 14350, 15262, 16997, 20791},
  { 2052,  2759,  3897,  5246,  6638, 10267, 15834, 16814, 18149, 21675},
  { 1798,  2497,  5617, 11449, 13189, 14711, 17050, 18195, 20307, 21182},
  { 1009,  1647,  2889,  5709,  9541, 12354, 15231, 18494, 20966, 22033},
  { 3016,  3794,  5406,  7469, 12488, 13984, 15328, 16334, 19952, 20791},
  { 2203,  3040,  3796,  5442, 11987, 13512, 14931, 16370, 17856, 18803},
  { 2912,  4292,  7988,  9572, 11562, 13244, 14556, 16529, 20004, 21073},
  { 2861,  3607,  5923,  7034,  9234, 12054, 13729, 18056, 20262, 20974},
  { 3069,  4311,  5967,  7367, 11482, 12699, 14309, 16233, 18333, 19172},
  { 2434,  3661,  4866,  5798, 10383, 11722, 13049, 15668, 18862, 19831},
  { 2020,  2605,  3860,  9241, 13275, 14644, 16010, 17099, 19268, 20251},
  { 1877,  2809,  3590,  4707, 11056, 12441, 15622, 17168, 18761, 19907},
  { 2107,  2873,  3673,  5799, 13579, 14687, 15938, 17077, 18890, 19831},
  { 1612,  2284,  2944,  3572,  8219, 13959, 15924, 17239, 18592, 20117},
  { 2420,  3156,  6542, 10215, 12061, 13534, 15305, 16452, 18717, 19880},
  { 1667,  2612,  3534,  5237, 10513, 11696, 12940, 16798, 18058, 19378},
  { 2388,  3017,  4839,  9333, 11413, 12730, 15024, 16248, 17449, 18677},
  { 1875,  2786,  4231,  6320,  8694, 10149, 11785, 17013, 18608, 19960},
  {  679,  1411,  4654,  8006, 11446, 13249, 15763, 18127, 20361, 21567},
  { 1838,  2596,  3578,  4608,  5650, 11274, 14355, 15886, 20579, 21754},
  { 1303,  1955,  2395,  3322, 12023, 13764, 15883, 18077, 20180, 21232},
  { 1438,  2102,  2663,  3462,  8328, 10362, 13763, 17248, 19732, 22344},
  {  860,  1904,  6098,  7775,  9815, 12007, 14821, 16709, 19787, 21132},
  { 1673,  2723,  3704,  6125,  7668,  9447, 13683, 14443, 20538, 21731},
  { 1246,  1849,  2902,  4508,  7221, 12710, 14835, 16314, 19335, 22720},
  { 1525,  2260,  3862,  5659,  7342, 11748, 13370, 14442, 18044, 21334},
  { 1196,  1846,  3104,  7063, 10972, 12905, 14814, 17037, 19922, 22636},
  { 2147,  3106,  4475,  6511,  8227,  9765, 10984, 12161, 18971, 21300},
  { 1585,  2405,  2994,  4036, 11481, 13177, 14519, 15431, 19967, 21275},
  { 1778,  2688,  3614,  4680,  9465, 11064, 12473, 16320, 19742, 20800},
  { 1862,  2586,  3492,  6719, 11708, 13012, 14364, 16128, 19610, 20425},
  { 1395,  2156,  2669,  3386, 10607, 12125, 13614, 16705, 18976, 21367},
  { 1444,  2117,  3286,  6233,  9423, 12981, 14998, 15853, 17188, 21857},
  { 2004,  2895,  3783,  4897,  6168,  7297, 12609, 16445, 19297, 21465},
  { 1495,  2863,  6360,  8100, 11399, 14271, 15902, 17711, 20479, 22061},
  { 2484,  3114,  5718,  7097,  8400, 12616, 14073, 14847, 20535, 21396},
  { 2424,  3277,  5296,  6284, 11290, 12903, 16022, 17508, 19333, 20283},
  { 2565,  3778,  5360,  6989,  8782, 10428, 14390, 15742, 17770, 21734},
  { 2727,  3384,  6613,  9254, 10542, 12236, 14651, 15687, 20074, 21102},
  { 1916,  2953,  6274,  8088,  9710, 10925, 12392, 16434, 20010, 21183},
  { 3384,  4366,  5349,  7667, 11180, 12605, 13921, 15324, 19901, 20754},
  { 3075,  4283,  5951,  7619,  9604, 11010, 12384, 14006, 20658, 21497},
  { 1751,  2455,  5147,  9966, 11621, 13176, 14739, 16470, 20788, 21756},
  { 1442,  2188,  3330,  6813,  8929, 12135, 14476, 15306, 19635, 20544},
  { 2294,  2895,  4070,  8035, 12233, 13416, 14762, 17367, 18952, 19688},
  { 1937,  2659,  4602,  6697,  9071, 12863, 14197, 15230, 16047, 18877},
  { 2071,  2663,  4216,  9445, 10887, 12292, 13949, 14909, 19236, 20341},
  { 1740,  2491,  3488,  8138,  9656, 11153, 13206, 14688, 20896, 21907},
  { 2199,  2881,  4675,  8527, 10051, 11408, 14435, 15463, 17190, 20597},
  { 1943,  2988,  4177,  6039,  7478,  8536, 14181, 15551, 17622, 21579},
  { 1825,  3175,  7062,  9818, 12824, 15450, 18330, 19856, 21830, 22412},
  { 2464,  3046,  4822,  5977,  7696, 15398, 16730, 17646, 20588, 21320},
  { 2550,  3393,  5305,  6920, 10235, 14083, 18143, 19195, 20681, 21336},
  { 3003,  3799,  5321,  6437,  7919, 11643, 15810, 16846, 18119, 18980},
  { 3455,  4157,  6838,  8199,  9877, 12314, 15905, 16826, 19949, 20892},
  { 3052,  3769,  4891,  5810,  6977, 10126, 14788, 15990, 19773, 20904},
  { 3671,  4356,  5827,  6997,  8460, 12084, 14154, 14939, 19247, 20423},
  { 2716,  3684,  5246,  6686,  8463, 10001, 12394, 14131, 16150, 19776},
  { 1945,  2638,  4130,  7995, 14338, 15576, 17057, 18206, 20225, 20997},
  { 2304,  2928,  4122,  4824,  5640, 13139, 15825, 16938, 20108, 21054},
  { 1800,  2516,  3350,  5219, 13406, 15948, 17618, 18540, 20531, 21252},
  { 1436,  2224,  2753,  4546,  9657, 11245, 15177, 16317, 17489, 19135},
  { 2319,  2899,  4980,  6936,  8404, 13489, 15554, 16281, 20270, 20911},
  { 2187,  2919,  4610,  5875,  7390, 12556, 14033, 16794, 20998, 21769},
  { 2235,  2923,  5121,  6259,  8099, 13589, 15340, 16340, 17927, 20159},
  { 1765,  2638,  3751,  5730,  7883, 10108, 13633, 15419, 16808, 18574},
  { 3460,  5741,  9596, 11742, 14413, 16080, 18173, 19090, 20845, 21601},
  { 3735,  4426,  6199,  7363,  9250, 14489, 16035, 17026, 19873, 20876},
  { 3521,  4778,  6887,  8680, 12717, 14322, 15950, 18050, 20166, 21145},
  { 2141,  2968,  6865,  8051, 10010, 13159, 14813, 15861, 17528, 18655},
  { 4148,  6128,  9028, 10871, 12686, 14005, 15976, 17208, 19587, 20595},
  { 4403,  5367,  6634,  8371, 10163, 11599, 14963, 16331, 17982, 18768},
  { 4091,  5386,  6852,  8770, 11563, 13290, 15728, 16930, 19056, 20102},
  { 2746,  3625,  5299,  7504, 10262, 11432, 13172, 15490, 16875, 17514},
  { 2248,  3556,  8539, 10590, 12665, 14696, 16515, 17824, 20268, 21247},
  { 1279,  1960,  3920,  7793, 10153, 14753, 16646, 18139, 20679, 21466},
  { 2440,  3475,  6737,  8654, 12190, 14588, 17119, 17925, 19110, 19979},
  { 1879,  2514,  4497,  7572, 10017, 14948, 16141, 16897, 18397, 19376},
  { 2804,  3688,  7490, 10086, 11218, 12711, 16307, 17470, 20077, 21126},
  { 2023,  2682,  3873,  8268, 10255, 11645, 15187, 17102, 18965, 19788},
  { 2823,  3605,  5815,  8595, 10085, 11469, 16568, 17462, 18754, 19876},
  { 2851,  3681,  5280,  7648,  9173, 10338, 14961, 16148, 17559, 18474},
  { 1348,  2645,  5826,  8785, 10620, 12831, 16255, 18319, 21133, 22586},
  { 2141,  3036,  4293,  6082,  7593, 10629, 17158, 18033, 21466, 22084},
  { 1608,  2375,  3384,  6878,  9970, 11227, 16928, 17650, 20185, 21120},
  { 2774,  3616,  5014,  6557,  7788,  8959, 17068, 18302, 19537, 20542},
  { 1934,  4813,  6204,  7212,  8979, 11665, 15989, 17811, 20426, 21703},
  { 2288,  3507,  5037,  6841,  8278,  9638, 15066, 16481, 21653, 22214},
  { 2951,  3771,  4878,  7578,  9016, 10298, 14490, 15242, 20223, 20990},
  { 3256,  4791,  6601,  7521,  8644,  9707, 13398, 16078, 19102, 20249},
  { 1827,  2614,  3486,  6039, 12149, 13823, 16191, 17282, 21423, 22041},
  { 1000,  1704,  3002,  6335,  8471, 10500, 14878, 16979, 20026, 22427},
  { 1646,  2286,  3109,  7245, 11493, 12791, 16824, 17667, 18981, 20222},
  { 1708,  2501,  3315,  6737,  8729,  9924, 16089, 17097, 18374, 19917},
  { 2623,  3510,  4478,  5645,  9862, 11115, 15219, 18067, 19583, 20382},
  { 2518,  3434,  4728,  6388,  8082,  9285, 13162, 18383, 19819, 20552},
  { 1726,  2383,  4090,  6303,  7805, 12845, 14612, 17608, 19269, 20181},
  { 2860,  3735,  4838,  6044,  7254,  8402, 14031, 16381, 18037, 19410},
  { 4247,  5993,  7952,  9792, 12342, 14653, 17527, 18774, 20831, 21699},
  { 3502,  4051,  5680,  6805,  8146, 11945, 16649, 17444, 20390, 21564},
  { 3151,  4893,  5899,  7198, 11418, 13073, 15124, 17673, 20520, 21861},
  { 3960,  4848,  5926,  7259,  8811, 10529, 15661, 16560, 18196, 20183},
  { 4499,  6604,  8036,  9251, 10804, 12627, 15880, 17512, 20020, 21046},
  { 4251,  5541,  6654,  8318,  9900, 11686, 15100, 17093, 20572, 21687},
  { 3769,  5327,  7865,  9360, 10684, 11818, 13660, 15366, 18733, 19882},
  { 3083,  3969,  6248,  8121,  9798, 10994, 12393, 13686, 17888, 19105},
  { 2731,  4670,  7063,  9201, 11346, 13735, 16875, 18797, 20787, 22360},
  { 1187,  2227,  4737,  7214,  9622, 12633, 15404, 17968, 20262, 23533},
  { 1911,  2477,  3915, 10098, 11616, 12955, 16223, 17138, 19270, 20729},
  { 1764,  2519,  3887,  6944,  9150, 12590, 16258, 16984, 17924, 18435},
  { 1400,  3674,  7131,  8718, 10688, 12508, 15708, 17711, 19720, 21068},
  { 2322,  3073,  4287,  8108,  9407, 10628, 15862, 16693, 19714, 21474},
  { 2630,  3339,  4758,  8360, 10274, 11333, 12880, 17374, 19221, 19936},
  { 1721,  2577,  5553,  7195,  8651, 10686, 15069, 16953, 18703, 19929}
};

/**
 * second stage LSP codebook, high and low parts
   (both 5-dimensional, with 32 entries (3.2.4 of G.729)
 */
static const int16_t cb_lsp_2nd[1<<VQ_2ND_BITS][10] = { /* (2.13) */
  { -435,  -815,  -742,  1033,  -518,   582, -1201,   829,    86,   385},
  { -833,  -891,   463,    -8, -1251,  1450,    72,  -231,   864,   661},
  {-1021,   231,  -306,   321,  -220,  -163,  -526,  -754, -1633,   267},
  {   57,  -198,  -339,   -33, -1468,   573,   796,  -169,  -631,   816},
  {  171,  -350,   294,  1660,   453,   519,   291,   159,  -640, -1296},
  { -701,  -842,   -58,   950,   892,  1549,   715,   527,  -714,  -193},
  {  584,    31,  -289,   356,  -333,  -457,   612,  -283, -1381,  -741},
  { -109,  -808,   231,    77,   -87,  -344,  1341,  1087,  -654,  -569},
  { -859,  1236,   550,   854,   714,  -543, -1752,  -195,   -98,  -276},
  { -877,  -954, -1248,  -299,   212,  -235,  -728,   949,  1517,   895},
  {  -77,   344,  -620,   763,   413,   502,  -362,  -960,  -483,  1386},
  { -314,  -307,  -256, -1260,  -429,   450,  -466,  -108,  1010,  2223},
  {  711,   693,   521,   650,  1305,   -28,  -378,   744, -1005,   240},
  { -112,  -271,  -500,   946,  1733,   271,   -15,   909,  -259,  1688},
  {  575,   -10,  -468,  -199,  1101, -1011,   581,   -53,  -747,   878},
  {  145,  -285, -1280,  -398,    36,  -498, -1377,    18,  -444,  1483},
  {-1133,  -835,  1350,  1284,   -95,  1015,  -222,   443,   372,  -354},
  {-1459, -1237,   416,  -213,   466,   669,   659,  1640,   932,   534},
  {  -15,    66,   468,  1019,  -748,  1385,  -182,  -907,  -721,  -262},
  { -338,   148,  1445,    75,  -760,   569,  1247,   337,   416,  -121},
  {  389,   239,  1568,   981,   113,   369, -1003,  -507,  -587,  -904},
  { -312,   -98,   949,    31,  1104,    72,  -141,  1465,    63,  -785},
  { 1127,   584,   835,   277, -1159,   208,   301,  -882,   117,  -404},
  {  539,  -114,   856,  -493,   223,  -912,   623,   -76,   276,  -440},
  { 2197,  2337,  1268,   670,   304,  -267,  -525,   140,   882,  -139},
  {-1596,   550,   801,  -456,   -56,  -697,   865,  1060,   413,   446},
  { 1154,   593,   -77,  1237,   -31,   581, -1037,  -895,   669,   297},
  {  397,   558,   203,  -797,  -919,     3,   692,  -292,  1050,   782},
  {  334,  1475,   632,   -80,    48, -1061,  -484,   362,  -597,  -852},
  { -545,  -330,  -429,  -680,  1133, -1182,  -744,  1340,   262,    63},
  { 1320,   827,  -398,  -576,   341,  -774,  -483, -1247,   -70,    98},
  { -163,   674,   -11,  -886,   531, -1125,  -265,  -242,   724,   934}
};

/**
 * gain codebook (first stage), 8k mode (3.9.2 of G.729)
 */
static const int16_t cb_gain_1st_8k[1<<GC_1ST_IDX_BITS_8K][2] = { /*(0.14) (2.13) */
  { 3242 ,  9949 },
  { 1551 ,  2425 },
  { 2678 , 27162 },
  { 1921 ,  9291 },
  { 1831 ,  5022 },
  {    1 ,  1516 },
  {  356 , 14756 },
  {   57 ,  5404 },
};

/**
 * gain codebook (second stage), 8k mode (3.9.2 of G.729)
 */
static const int16_t cb_gain_2nd_8k[1<<GC_2ND_IDX_BITS_8K][2] = { /*(1.14) (1.13) */
  {  5142 ,   592 },
  { 17299 ,  1861 },
  {  6160 ,  2395 },
  { 16112 ,  3392 },
  {   826 ,  2005 },
  { 18973 ,  5935 },
  {  1994 ,     0 },
  { 15434 ,   237 },
  { 10573 ,  2966 },
  { 15132 ,  4914 },
  { 11569 ,  1196 },
  { 14194 ,  1630 },
  {  8091 ,  4861 },
  { 15161 , 14276 },
  {  9120 ,   525 },
  { 13260 ,  3256 },
};

/**
 * gain codebook (first stage), 6.4k mode (D.3.9.2 of G.729)
 */
static const int16_t cb_gain_1st_6k4[1<<GC_1ST_IDX_BITS_6K4][2] =
{ /*(0.14) (1.14)*/
 { 5849,     0 },
 { 3171,  9280 },
 { 3617,  6747 },
 { 4987, 22294 },
 { 2929,  1078 },
 { 6068,  6093 },
 { 9425,  2731 },
 { 3915, 12872 },
};

/**
 * gain codebook (second stage), 6.4k mode (D.3.9.2 of G.729)
 */
static const int16_t cb_gain_2nd_6k4[1<<GC_2ND_IDX_BITS_6K4][2] =
{ /*(1.14) (1.14)*/
 {    0,  4175 },
 {10828, 27602 },
 {16423, 15724 },
 { 4478,  7324 },
 { 3988,     0 },
 {10291, 11385 },
 {11956, 10735 },
 { 7876,  7821 },
};

/**
 * 4th order Moving Average (MA) Predictor codebook (3.2.4 of G.729)
 *
 * float cb_ma_predictor_float[2][MA_NP][10] = {
 *   {
 *     {0.2570, 0.2780, 0.2800, 0.2736, 0.2757, 0.2764, 0.2675, 0.2678, 0.2779, 0.2647},
 *     {0.2142, 0.2194, 0.2331, 0.2230, 0.2272, 0.2252, 0.2148, 0.2123, 0.2115, 0.2096},
 *     {0.1670, 0.1523, 0.1567, 0.1580, 0.1601, 0.1569, 0.1589, 0.1555, 0.1474, 0.1571},
 *     {0.1238, 0.0925, 0.0798, 0.0923, 0.0890, 0.0828, 0.1010, 0.0988, 0.0872, 0.1060},
 *   },
 *   {
 *     {0.2360, 0.2405, 0.2499, 0.2495, 0.2517, 0.2591, 0.2636, 0.2625, 0.2551, 0.2310},
 *     {0.1285, 0.0925, 0.0779, 0.1060, 0.1183, 0.1176, 0.1277, 0.1268, 0.1193, 0.1211},
 *     {0.0981, 0.0589, 0.0401, 0.0654, 0.0761, 0.0728, 0.0841, 0.0826, 0.0776, 0.0891},
 *     {0.0923, 0.0486, 0.0287, 0.0498, 0.0526, 0.0482, 0.0621, 0.0636, 0.0584, 0.0794},
 *   },
 * };
 *                                    15
 * cb_ma_predictor[j][k][i] = floor( 2 * cb_ma_predictor_float[j][k][i] )
 *
 * j=0..1, i=0..9, k=0..MA_NP-1
 */
static const int16_t cb_ma_predictor[2][MA_NP][10] = { /* (0.15) */
  {
    { 8421,  9109,  9175,  8965,  9034,  9057,  8765,  8775,  9106,  8673},
    { 7018,  7189,  7638,  7307,  7444,  7379,  7038,  6956,  6930,  6868},
    { 5472,  4990,  5134,  5177,  5246,  5141,  5206,  5095,  4830,  5147},
    { 4056,  3031,  2614,  3024,  2916,  2713,  3309,  3237,  2857,  3473}
  },
  {
    { 7733,  7880,  8188,  8175,  8247,  8490,  8637,  8601,  8359,  7569},
    { 4210,  3031,  2552,  3473,  3876,  3853,  4184,  4154,  3909,  3968},
    { 3214,  1930,  1313,  2143,  2493,  2385,  2755,  2706,  2542,  2919},
    { 3024,  1592,   940,  1631,  1723,  1579,  2034,  2084,  1913,  2601}
  }
};

/**
 *                                     15         3
 * cb_ma_predictor_sum[j][i] = floor( 2 * (1.0 - sum ( cb_ma_predictor_float[j][k][i] ) ) )
 *                                               k=0
 * j=0..1, i=0..9
 */
static const int16_t cb_ma_predictor_sum[2][10] = { /* (0.15) */
  { 7798,  8447,  8205,  8293,  8126,  8477,  8447,  8703,  9043,  8604},
  {14585, 18333, 19772, 17344, 16426, 16459, 15155, 15220, 16043, 15708}
};

/**
 *                                                           12
 *                                                          2
 * cb_ma_predictor_sum_inv[j][i] = floor(---------------------------------------------)
 *                                               3
 *                                        1.0 - sum ( cb_ma_predictor_float[j][k][i] )
 *                                              k=0
 * j=0..1, i=0..9
 */
static const int16_t cb_ma_predictor_sum_inv[2][10] = { /* (3.12) */
  {17210, 15888, 16357, 16183, 16516, 15833, 15888, 15421, 14840, 15597},
  { 9202,  7320,  6788,  7738,  8170,  8154,  8856,  8818,  8366,  8544}
};

/**
 * MA prediction coefficients (3.9.1 of G.729, near Equation 69)
 */
static const uint16_t ma_prediction_coeff[4] = { /* (0.13) */
  5571, 4751, 2785, 1556
};

/**
 * initial LSP coefficients belongs to virtual frame preceding  the
 * first frame of the stream
 */
static const int16_t lsp_init[10]= { /* (0.15) */
   30000, 26000, 21000, 15000, 8000, 0, -8000,-15000,-21000,-26000
};

/**
 * additional "phase" post-processing filter impulse response (D.6.2 of G.729)
 *
 * Table contains three impulse responses, correspond to
 * different amounts of spreading.
 */
static const int16_t phase_filter[3][40] =
{
  { // maximum spreading (for noise-like segments)
    14690, 11518,  1268, -2762, -5672,  7514,  -36, -2808, -3041,  4823,
     2952, -8425,  3785,  1455,  2179, -8638, 8051, -2104, -1455,   777,
     1108, -2386,  2254,  -364,  -675, -2104, 6046, -5682,  1072,  3123,
    -5059,  5312, -2330, -3729,  6924, -3890,  675, -1776,    29, 10145,
  },
  { // medium spreading
    30274,  3831, -4037,  2972, -1049, -1003,  2477, -3044,  2815, -2232,
     1753, -1612,  1714, -1776,  1543, -1009,   429,  -170,   472, -1265,
     2176, -2707,  2523, -1622,   344,   826, -1530,  1724, -1658,  1701,
    -2064,  2644, -3061,  2897, -1979,   557,   780, -1370,   842,   655,
  },
  { // no spreading (for voiced speech)
    32767, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  }
};
#endif /* AVCODEC_G729DATA_H */