Restore WIP g729 code that has been remvoed by diego biurrun.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/acelp_pitch_delay.c

@@ -105,9 +105,20 @@ int16_t ff_acelp_decode_gain_code(
     for(i=0; i<ma_pred_order; i++)
         mr_energy += quant_energy[i] * ma_prediction_coeff[i];
 
+#ifdef G729_BITEXACT
+    mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);
+
+    mr_energy = (5439 * (mr_energy >> 15)) >> 8;           // (0.15) = (0.15) * (7.23)
+
+    return bidir_sal(
+               ((ff_exp2(mr_energy & 0x7fff) + 16) >> 5) * (gain_corr_factor >> 1),
+               (mr_energy >> 15) - 25
+           );
+#else
     mr_energy = gain_corr_factor * exp(M_LN10 / (20 << 23) * mr_energy) /
                 sqrt(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0));
     return mr_energy >> 12;
+#endif
 }
 
 float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,

libavcodec/acelp_vectors.c

@@ -48,6 +48,26 @@ const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
   28, 26,
 };
 
+const uint8_t ff_fc_2pulses_9bits_track2_gray[32] =
+{
+  0,  2,
+  5,  4,
+  12, 10,
+  7,  9,
+  25, 24,
+  20, 22,
+  14, 15,
+  19, 17,
+  36, 31,
+  21, 26,
+  1,  6,
+  16, 11,
+  27, 29,
+  32, 30,
+  39, 37,
+  34, 35,
+};
+
 const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
 {
   0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,

libavcodec/acelp_vectors.h

@@ -81,6 +81,37 @@ extern const uint8_t ff_fc_4pulses_8bits_track_4[32];
 extern const uint8_t ff_fc_2pulses_9bits_track1[16];
 extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16];
 
+/**
+ * Track|Pulse|        Positions
+ * -----------------------------------------
+ *  2   | 1   | 0, 7, 14, 20, 27, 34,  1, 21
+ *      |     | 2, 9, 15, 22, 29, 35,  6, 26
+ *      |     | 4,10, 17, 24, 30, 37, 11, 31
+ *      |     | 5,12, 19, 25, 32, 39, 16, 36
+ * -----------------------------------------
+ *
+ * @remark Track in the table should be read top-to-bottom, left-to-right.
+ *
+ * @note (EE.1) This table (from the reference code) does not comply with
+ *              the specification.
+ *              The specification contains the following table:
+ *
+ * Track|Pulse|        Positions
+ * -----------------------------------------
+ *  2   | 1   | 0, 5, 10, 15, 20, 25, 30, 35
+ *      |     | 1, 6, 11, 16, 21, 26, 31, 36
+ *      |     | 2, 7, 12, 17, 22, 27, 32, 37
+ *      |     | 4, 9, 14, 19, 24, 29, 34, 39
+ *
+ * -----------------------------------------
+ *
+ * @note (EE.2) Reference G.729D code also uses gray decoding for each
+ *              pulse index before looking up the value in the table.
+ *
+ * Used in G.729 @@6.4k (with gray coding)
+ */
+extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32];
+
 /**
  * b60 hamming windowed sinc function coefficients
  */

libavcodec/amrnbdec.c

@@ -83,7 +83,7 @@
 /** Maximum sharpening factor
  *
  * The specification says 0.8, which should be 13107, but the reference C code
- * uses 13017 instead. (Amusingly the same applies to SHARP_MAX in bitexact G.729.)
+ * uses 13017 instead. (Amusingly the same applies to SHARP_MAX in g729dec.c.)
  */
 #define SHARP_MAX 0.79449462890625
 

libavcodec/celp_math.c

@@ -27,6 +27,82 @@
 #include "avcodec.h"
 #include "celp_math.h"
 
+#ifdef G729_BITEXACT
+/**
+ * Cosine table: base_cos[i] = (1<<15) * cos(i*PI/64)
+ */
+static const int16_t base_cos[64] =
+{
+  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
+};
+
+/**
+ * Slope used to compute cos(x)
+ *
+ * cos(ind*64+offset) = base_cos[ind]+offset*slope_cos[ind]
+ * values multiplied by 1<<19
+ */
+static const int16_t slope_cos[64] =
+{
+   -632,  -1893,  -3150,  -4399,  -5638,  -6863,  -8072,  -9261,
+ -10428, -11570, -12684, -13767, -14817, -15832, -16808, -17744,
+ -18637, -19486, -20287, -21039, -21741, -22390, -22986, -23526,
+ -24009, -24435, -24801, -25108, -25354, -25540, -25664, -25726,
+ -25726, -25664, -25540, -25354, -25108, -24801, -24435, -24009,
+ -23526, -22986, -22390, -21741, -21039, -20287, -19486, -18637,
+ -17744, -16808, -15832, -14817, -13767, -12684, -11570, -10428,
+  -9261,  -8072,  -6863,  -5638,  -4399,  -3150,  -1893,   -632
+};
+
+/**
+ * Table used to compute exp2(x)
+ *
+ * tab_exp2[i] = (1<<14) * exp2(i/32) = 2^(i/32) i=0..32
+ */
+static const uint16_t tab_exp2[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
+};
+
+int16_t ff_cos(uint16_t arg)
+{
+    uint8_t offset= arg;
+    uint8_t ind = arg >> 8;
+
+    assert(arg < 0x4000);
+
+    return FFMAX(base_cos[ind] + ((slope_cos[ind] * offset) >> 12), -0x8000);
+}
+
+int ff_exp2(uint16_t power)
+{
+    uint16_t frac_x0;
+    uint16_t frac_dx;
+    int result;
+
+    assert(power <= 0x7fff);
+
+    frac_x0 = power >> 10;
+    frac_dx = (power & 0x03ff) << 5;
+
+    result = tab_exp2[frac_x0] << 15;
+    result += frac_dx * (tab_exp2[frac_x0+1] - tab_exp2[frac_x0]);
+
+    return result >> 10;
+}
+
+#else // G729_BITEXACT
+
 /**
  * Cosine table: base_cos[i] = (1<<15) * cos(i*PI/64)
  */
@@ -78,6 +154,8 @@ int ff_exp2(uint16_t power)
     return result + ((result*(power&31)*89)>>22);
 }
 
+#endif // else G729_BITEXACT
+
 /**
  * Table used to compute log2(x)
  *
@@ -85,10 +163,17 @@ int ff_exp2(uint16_t power)
  */
 static const uint16_t tab_log2[33] =
 {
+#ifdef G729_BITEXACT
+      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,
+#else
       4,   1459,   2870,   4240,   5572,   6867,   8127,   9355,
   10552,  11719,  12858,  13971,  15057,  16120,  17158,  18175,
   19170,  20145,  21100,  22036,  22954,  23854,  24738,  25605,
   26457,  27294,  28116,  28924,  29719,  30500,  31269,  32025,  32769,
+#endif
 };
 
 int ff_log2(uint32_t value)

libavcodec/g729data.h

+/*
+ * data for G.729 decoder
+ * 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 },
+};
+
+/**
+ * 4th order Moving Average (MA) Predictor codebook (3.2.4 of G.729)
+ */
+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}
+  }
+};
+
+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}
+};
+
+/**
+ * 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
+};
+#endif /* AVCODEC_G729DATA_H */

libavcodec/g729dec.c

+/*
+ * G.729 decoder
+ * Copyright (c) 2008 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
+ */
+#include <stdlib.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+
+#include "avcodec.h"
+#include "libavutil/avutil.h"
+#include "get_bits.h"
+
+#include "lsp.h"
+#include "celp_math.h"
+#include "acelp_filters.h"
+#include "acelp_pitch_delay.h"
+#include "acelp_vectors.h"
+#include "g729data.h"
+
+/**
+ * minimum quantized LSF value (3.2.4)
+ * 0.005 in Q13
+ */
+#define LSFQ_MIN                   40
+
+/**
+ * maximum quantized LSF value (3.2.4)
+ * 3.135 in Q13
+ */
+#define LSFQ_MAX                   25681
+
+/**
+ * minimum LSF distance (3.2.4)
+ * 0.0391 in Q13
+ */
+#define LSFQ_DIFF_MIN              321
+
+/**
+ * minimum gain pitch value (3.8, Equation 47)
+ * 0.2 in (1.14)
+ */
+#define SHARP_MIN                  3277
+
+/**
+ * maximum gain pitch value (3.8, Equation 47)
+ * (EE) This does not comply with the specification.
+ * Specification says about 0.8, which should be
+ * 13107 in (1.14), but reference C code uses
+ * 13017 (equals to 0.7945) instead of it.
+ */
+#define SHARP_MAX                  13017
+
+/**
+ * subframe size
+ */
+#define SUBFRAME_SIZE              40
+
+
+typedef struct {
+    uint8_t ac_index_bits[2];   ///< adaptive codebook index for second subframe (size in bits)
+    uint8_t parity_bit;         ///< parity bit for pitch delay
+    uint8_t gc_1st_index_bits;  ///< gain codebook (first stage) index (size in bits)
+    uint8_t gc_2nd_index_bits;  ///< gain codebook (second stage) index (size in bits)
+    uint8_t fc_signs_bits;      ///< number of pulses in fixed-codebook vector
+    uint8_t fc_indexes_bits;    ///< size (in bits) of fixed-codebook index entry
+} G729FormatDescription;
+
+typedef struct {
+    int pitch_delay_int_prev;   ///< integer part of previous subframe's pitch delay (4.1.3)
+
+    /// (2.13) LSP quantizer outputs
+    int16_t  past_quantizer_output_buf[MA_NP + 1][10];
+    int16_t* past_quantizer_outputs[MA_NP + 1];
+
+    int16_t lsfq[10];           ///< (2.13) quantized LSF coefficients from previous frame
+    int16_t lsp_buf[2][10];     ///< (0.15) LSP coefficients (previous and current frames) (3.2.5)
+    int16_t *lsp[2];            ///< pointers to lsp_buf
+}  G729Context;
+
+static const G729FormatDescription format_g729_8k = {
+    .ac_index_bits     = {8,5},
+    .parity_bit        = 1,
+    .gc_1st_index_bits = GC_1ST_IDX_BITS_8K,
+    .gc_2nd_index_bits = GC_2ND_IDX_BITS_8K,
+    .fc_signs_bits     = 4,
+    .fc_indexes_bits   = 13,
+};
+
+static const G729FormatDescription format_g729d_6k4 = {
+    .ac_index_bits     = {8,4},
+    .parity_bit        = 0,
+    .gc_1st_index_bits = GC_1ST_IDX_BITS_6K4,
+    .gc_2nd_index_bits = GC_2ND_IDX_BITS_6K4,
+    .fc_signs_bits     = 2,
+    .fc_indexes_bits   = 9,
+};
+
+/**
+ * @brief pseudo random number generator
+ */
+static inline uint16_t g729_prng(uint16_t value)
+{
+    return 31821 * value + 13849;
+}
+
+/**
+ * Get parity bit of bit 2..7
+ */
+static inline int get_parity(uint8_t value)
+{
+   return (0x6996966996696996ULL >> (value >> 2)) & 1;
+}
+
+static void lsf_decode(int16_t* lsfq, int16_t* past_quantizer_outputs[MA_NP + 1],
+                       int16_t ma_predictor,
+                       int16_t vq_1st, int16_t vq_2nd_low, int16_t vq_2nd_high)
+{
+    int i,j;
+    static const uint8_t min_distance[2]={10, 5}; //(2.13)
+    int16_t* quantizer_output = past_quantizer_outputs[MA_NP];
+
+    for (i = 0; i < 5; i++) {
+        quantizer_output[i]     = cb_lsp_1st[vq_1st][i    ] + cb_lsp_2nd[vq_2nd_low ][i    ];
+        quantizer_output[i + 5] = cb_lsp_1st[vq_1st][i + 5] + cb_lsp_2nd[vq_2nd_high][i + 5];
+    }
+
+    for (j = 0; j < 2; j++) {
+        for (i = 1; i < 10; i++) {
+            int diff = (quantizer_output[i - 1] - quantizer_output[i] + min_distance[j]) >> 1;
+            if (diff > 0) {
+                quantizer_output[i - 1] -= diff;
+                quantizer_output[i    ] += diff;
+            }
+        }
+    }
+
+    for (i = 0; i < 10; i++) {
+        int sum = quantizer_output[i] * cb_ma_predictor_sum[ma_predictor][i];
+        for (j = 0; j < MA_NP; j++)
+            sum += past_quantizer_outputs[j][i] * cb_ma_predictor[ma_predictor][j][i];
+
+        lsfq[i] = sum >> 15;
+    }
+
+    /* Rotate past_quantizer_outputs. */
+    memmove(past_quantizer_outputs + 1, past_quantizer_outputs, MA_NP * sizeof(int16_t*));
+    past_quantizer_outputs[0] = quantizer_output;
+
+    ff_acelp_reorder_lsf(lsfq, LSFQ_DIFF_MIN, LSFQ_MIN, LSFQ_MAX, 10);
+}
+
+static av_cold int decoder_init(AVCodecContext * avctx)
+{
+    G729Context* ctx = avctx->priv_data;
+    int i,k;
+
+    if (avctx->channels != 1) {
+        av_log(avctx, AV_LOG_ERROR, "Only mono sound is supported (requested channels: %d).\n", avctx->channels);
+        return AVERROR(EINVAL);
+    }
+
+    /* Both 8kbit/s and 6.4kbit/s modes uses two subframes per frame. */
+    avctx->frame_size = SUBFRAME_SIZE << 1;
+
+    for (k = 0; k < MA_NP + 1; k++) {
+        ctx->past_quantizer_outputs[k] = ctx->past_quantizer_output_buf[k];
+        for (i = 1; i < 11; i++)
+            ctx->past_quantizer_outputs[k][i - 1] = (18717 * i) >> 3;
+    }
+
+    ctx->lsp[0] = ctx->lsp_buf[0];
+    ctx->lsp[1] = ctx->lsp_buf[1];
+    memcpy(ctx->lsp[0], lsp_init, 10 * sizeof(int16_t));
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+                        AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    int16_t *out_frame = data;
+    GetBitContext gb;
+    G729FormatDescription format;
+    int frame_erasure = 0;    ///< frame erasure detected during decoding
+    int bad_pitch = 0;        ///< parity check failed
+    int i;
+    G729Context *ctx = avctx->priv_data;
+    int16_t lp[2][11];           // (3.12)
+    uint8_t ma_predictor;     ///< switched MA predictor of LSP quantizer
+    uint8_t quantizer_1st;    ///< first stage vector of quantizer
+    uint8_t quantizer_2nd_lo; ///< second stage lower vector of quantizer (size in bits)
+    uint8_t quantizer_2nd_hi; ///< second stage higher vector of quantizer (size in bits)
+
+    int pitch_delay_int;         // pitch delay, integer part
+    int pitch_delay_3x;          // pitch delay, multiplied by 3
+
+    if (*data_size < SUBFRAME_SIZE << 2) {
+        av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
+        return AVERROR(EIO);
+    }
+
+    if (buf_size == 10) {
+        format = format_g729_8k;
+        av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729 @ 8kbit/s");
+    } else if (buf_size == 8) {
+        format = format_g729d_6k4;
+        av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729D @ 6.4kbit/s");
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "Packet size %d is unknown.\n", buf_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    for (i=0; i < buf_size; i++)
+        frame_erasure |= buf[i];
+    frame_erasure = !frame_erasure;
+
+    init_get_bits(&gb, buf, buf_size);
+
+    ma_predictor     = get_bits(&gb, 1);
+    quantizer_1st    = get_bits(&gb, VQ_1ST_BITS);
+    quantizer_2nd_lo = get_bits(&gb, VQ_2ND_BITS);
+    quantizer_2nd_hi = get_bits(&gb, VQ_2ND_BITS);
+
+    lsf_decode(ctx->lsfq, ctx->past_quantizer_outputs,
+               ma_predictor,
+               quantizer_1st, quantizer_2nd_lo, quantizer_2nd_hi);
+
+    ff_acelp_lsf2lsp(ctx->lsp[1], ctx->lsfq, 10);
+
+    ff_acelp_lp_decode(&lp[0][0], &lp[1][0], ctx->lsp[1], ctx->lsp[0], 10);
+
+    FFSWAP(int16_t*, ctx->lsp[1], ctx->lsp[0]);
+
+    for (i = 0; i < 2; i++) {
+        uint8_t ac_index;      ///< adaptive codebook index
+        uint8_t pulses_signs;  ///< fixed-codebook vector pulse signs
+        int fc_indexes;        ///< fixed-codebook indexes
+        uint8_t gc_1st_index;  ///< gain codebook (first stage) index
+        uint8_t gc_2nd_index;  ///< gain codebook (second stage) index
+
+        ac_index      = get_bits(&gb, format.ac_index_bits[i]);
+        if(!i && format.parity_bit)
+            bad_pitch = get_parity(ac_index) == get_bits1(&gb);
+        fc_indexes    = get_bits(&gb, format.fc_indexes_bits);
+        pulses_signs  = get_bits(&gb, format.fc_signs_bits);
+        gc_1st_index  = get_bits(&gb, format.gc_1st_index_bits);
+        gc_2nd_index  = get_bits(&gb, format.gc_2nd_index_bits);
+
+        if(!i) {
+            if (bad_pitch)
+                pitch_delay_3x   = 3 * ctx->pitch_delay_int_prev;
+            else
+                pitch_delay_3x = ff_acelp_decode_8bit_to_1st_delay3(ac_index);
+        } else {
+            int pitch_delay_min = av_clip(ctx->pitch_delay_int_prev - 5,
+                                          PITCH_DELAY_MIN, PITCH_DELAY_MAX - 9);
+
+            if(packet_type == FORMAT_G729D_6K4)
+                pitch_delay_3x = ff_acelp_decode_4bit_to_2nd_delay3(ac_index, pitch_delay_min);
+            else
+                pitch_delay_3x = ff_acelp_decode_5_6_bit_to_2nd_delay3(ac_index, pitch_delay_min);
+        }
+
+        /* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */
+        pitch_delay_int  = (pitch_delay_3x + 1) / 3;
+
+        ff_acelp_weighted_vector_sum(fc + pitch_delay_int,
+                                     fc + pitch_delay_int,
+                                     fc, 1 << 14,
+                                     av_clip(ctx->gain_pitch, SHARP_MIN, SHARP_MAX),
+                                     0, 14,
+                                     SUBFRAME_SIZE - pitch_delay_int);
+
+        if (frame_erasure) {
+            ctx->gain_pitch = (29491 * ctx->gain_pitch) >> 15; // 0.90 (0.15)
+            ctx->gain_code  = ( 2007 * ctx->gain_code ) >> 11; // 0.98 (0.11)
+
+            gain_corr_factor = 0;
+        } else {
+            ctx->gain_pitch  = cb_gain_1st_8k[gc_1st_index][0] +
+                               cb_gain_2nd_8k[gc_2nd_index][0];
+            gain_corr_factor = cb_gain_1st_8k[gc_1st_index][1] +
+                               cb_gain_2nd_8k[gc_2nd_index][1];
+
+        ff_acelp_weighted_vector_sum(ctx->exc + i * SUBFRAME_SIZE,
+                                     ctx->exc + i * SUBFRAME_SIZE, fc,
+                                     (!voicing && frame_erasure) ? 0 : ctx->gain_pitch,
+                                     ( voicing && frame_erasure) ? 0 : ctx->gain_code,
+                                     1 << 13, 14, SUBFRAME_SIZE);
+
+            ctx->pitch_delay_int_prev = pitch_delay_int;
+    }
+
+    *data_size = SUBFRAME_SIZE << 2;
+    return buf_size;
+}
+
+AVCodec ff_g729_decoder =
+{
+    "g729",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_G729,
+    sizeof(G729Context),
+    decoder_init,
+    NULL,
+    NULL,
+    decode_frame,
+    .long_name = NULL_IF_CONFIG_SMALL("G.729"),
+};

libavcodec/lsp.c

@@ -150,7 +150,11 @@ void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd
 
     /* LSP values for first subframe (3.2.5 of G.729, Equation 24)*/
     for(i=0; i<lp_order; i++)
+#ifdef G729_BITEXACT
+        lsp_1st[i] = (lsp_2nd[i] >> 1) + (lsp_prev[i] >> 1);
+#else
         lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) >> 1;
+#endif
 
     ff_acelp_lsp2lpc(lp_1st, lsp_1st, lp_order >> 1);