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ffmpeg/libavcodec/aptx.c
Andreas Rheinhardt c0d483cecb avcodec/aptx: Use AVCodecContext.frame_size according to the API 
Currently the APTX (HD) codecs set frame_size if unset and check
whether it is divisible by block_size (corresponding to block_align
as used by other codecs). But this is based upon a misunderstanding
of the API: frame_size is not in bytes, but in samples.

Said value is also not intended to be set by the user at all,
but set by encoders and (possibly) decoders if the number of channels
in a frame is constant. The latter condition is not fulfilled here,
so only set it for encoders. Given that the encoder can handle any
number of samples as long as it is divisible by four and given that
it worked to set a custom frame size before, the encoders accept
any multiple of four; otherwise the value is set to the value
that it already had for APTX: 1024 samples (per channel).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-09-19 17:05:33 +02:00

530 lines
23 KiB
C
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/*
* Audio Processing Technology codec for Bluetooth (aptX)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
*
* 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 "aptx.h"
#include "mathops.h"
static const int32_t quantize_intervals_LF[65] = {
-9948, 9948, 29860, 49808, 69822, 89926, 110144, 130502,
151026, 171738, 192666, 213832, 235264, 256982, 279014, 301384,
324118, 347244, 370790, 394782, 419250, 444226, 469742, 495832,
522536, 549890, 577936, 606720, 636290, 666700, 698006, 730270,
763562, 797958, 833538, 870398, 908640, 948376, 989740, 1032874,
1077948, 1125150, 1174700, 1226850, 1281900, 1340196, 1402156, 1468282,
1539182, 1615610, 1698514, 1789098, 1888944, 2000168, 2125700, 2269750,
2438670, 2642660, 2899462, 3243240, 3746078, 4535138, 5664098, 7102424,
8897462,
};
static const int32_t invert_quantize_dither_factors_LF[65] = {
9948, 9948, 9962, 9988, 10026, 10078, 10142, 10218,
10306, 10408, 10520, 10646, 10784, 10934, 11098, 11274,
11462, 11664, 11880, 12112, 12358, 12618, 12898, 13194,
13510, 13844, 14202, 14582, 14988, 15422, 15884, 16380,
16912, 17484, 18098, 18762, 19480, 20258, 21106, 22030,
23044, 24158, 25390, 26760, 28290, 30008, 31954, 34172,
36728, 39700, 43202, 47382, 52462, 58762, 66770, 77280,
91642, 112348, 144452, 199326, 303512, 485546, 643414, 794914,
1000124,
};
static const int32_t quantize_dither_factors_LF[65] = {
0, 4, 7, 10, 13, 16, 19, 22,
26, 28, 32, 35, 38, 41, 44, 47,
51, 54, 58, 62, 65, 70, 74, 79,
84, 90, 95, 102, 109, 116, 124, 133,
143, 154, 166, 180, 195, 212, 231, 254,
279, 308, 343, 383, 430, 487, 555, 639,
743, 876, 1045, 1270, 1575, 2002, 2628, 3591,
5177, 8026, 13719, 26047, 45509, 39467, 37875, 51303,
0,
};
static const int16_t quantize_factor_select_offset_LF[65] = {
0, -21, -19, -17, -15, -12, -10, -8,
-6, -4, -1, 1, 3, 6, 8, 10,
13, 15, 18, 20, 23, 26, 29, 31,
34, 37, 40, 43, 47, 50, 53, 57,
60, 64, 68, 72, 76, 80, 85, 89,
94, 99, 105, 110, 116, 123, 129, 136,
144, 152, 161, 171, 182, 194, 207, 223,
241, 263, 291, 328, 382, 467, 522, 522,
522,
};
static const int32_t quantize_intervals_MLF[9] = {
-89806, 89806, 278502, 494338, 759442, 1113112, 1652322, 2720256, 5190186,
};
static const int32_t invert_quantize_dither_factors_MLF[9] = {
89806, 89806, 98890, 116946, 148158, 205512, 333698, 734236, 1735696,
};
static const int32_t quantize_dither_factors_MLF[9] = {
0, 2271, 4514, 7803, 14339, 32047, 100135, 250365, 0,
};
static const int16_t quantize_factor_select_offset_MLF[9] = {
0, -14, 6, 29, 58, 96, 154, 270, 521,
};
static const int32_t quantize_intervals_MHF[3] = {
-194080, 194080, 890562,
};
static const int32_t invert_quantize_dither_factors_MHF[3] = {
194080, 194080, 502402,
};
static const int32_t quantize_dither_factors_MHF[3] = {
0, 77081, 0,
};
static const int16_t quantize_factor_select_offset_MHF[3] = {
0, -33, 136,
};
static const int32_t quantize_intervals_HF[5] = {
-163006, 163006, 542708, 1120554, 2669238,
};
static const int32_t invert_quantize_dither_factors_HF[5] = {
163006, 163006, 216698, 361148, 1187538,
};
static const int32_t quantize_dither_factors_HF[5] = {
0, 13423, 36113, 206598, 0,
};
static const int16_t quantize_factor_select_offset_HF[5] = {
0, -8, 33, 95, 262,
};
static const int32_t hd_quantize_intervals_LF[257] = {
-2436, 2436, 7308, 12180, 17054, 21930, 26806, 31686,
36566, 41450, 46338, 51230, 56124, 61024, 65928, 70836,
75750, 80670, 85598, 90530, 95470, 100418, 105372, 110336,
115308, 120288, 125278, 130276, 135286, 140304, 145334, 150374,
155426, 160490, 165566, 170654, 175756, 180870, 185998, 191138,
196294, 201466, 206650, 211850, 217068, 222300, 227548, 232814,
238096, 243396, 248714, 254050, 259406, 264778, 270172, 275584,
281018, 286470, 291944, 297440, 302956, 308496, 314056, 319640,
325248, 330878, 336532, 342212, 347916, 353644, 359398, 365178,
370986, 376820, 382680, 388568, 394486, 400430, 406404, 412408,
418442, 424506, 430600, 436726, 442884, 449074, 455298, 461554,
467844, 474168, 480528, 486922, 493354, 499820, 506324, 512866,
519446, 526064, 532722, 539420, 546160, 552940, 559760, 566624,
573532, 580482, 587478, 594520, 601606, 608740, 615920, 623148,
630426, 637754, 645132, 652560, 660042, 667576, 675164, 682808,
690506, 698262, 706074, 713946, 721876, 729868, 737920, 746036,
754216, 762460, 770770, 779148, 787594, 796108, 804694, 813354,
822086, 830892, 839774, 848736, 857776, 866896, 876100, 885386,
894758, 904218, 913766, 923406, 933138, 942964, 952886, 962908,
973030, 983254, 993582, 1004020, 1014566, 1025224, 1035996, 1046886,
1057894, 1069026, 1080284, 1091670, 1103186, 1114838, 1126628, 1138558,
1150634, 1162858, 1175236, 1187768, 1200462, 1213320, 1226346, 1239548,
1252928, 1266490, 1280242, 1294188, 1308334, 1322688, 1337252, 1352034,
1367044, 1382284, 1397766, 1413494, 1429478, 1445728, 1462252, 1479058,
1496158, 1513562, 1531280, 1549326, 1567710, 1586446, 1605550, 1625034,
1644914, 1665208, 1685932, 1707108, 1728754, 1750890, 1773542, 1796732,
1820488, 1844840, 1869816, 1895452, 1921780, 1948842, 1976680, 2005338,
2034868, 2065322, 2096766, 2129260, 2162880, 2197708, 2233832, 2271352,
2310384, 2351050, 2393498, 2437886, 2484404, 2533262, 2584710, 2639036,
2696578, 2757738, 2822998, 2892940, 2968278, 3049896, 3138912, 3236760,
3345312, 3467068, 3605434, 3765154, 3952904, 4177962, 4452178, 4787134,
5187290, 5647128, 6159120, 6720518, 7332904, 8000032, 8726664, 9518152,
10380372,
};
static const int32_t hd_invert_quantize_dither_factors_LF[257] = {
2436, 2436, 2436, 2436, 2438, 2438, 2438, 2440,
2442, 2442, 2444, 2446, 2448, 2450, 2454, 2456,
2458, 2462, 2464, 2468, 2472, 2476, 2480, 2484,
2488, 2492, 2498, 2502, 2506, 2512, 2518, 2524,
2528, 2534, 2540, 2548, 2554, 2560, 2568, 2574,
2582, 2588, 2596, 2604, 2612, 2620, 2628, 2636,
2646, 2654, 2664, 2672, 2682, 2692, 2702, 2712,
2722, 2732, 2742, 2752, 2764, 2774, 2786, 2798,
2810, 2822, 2834, 2846, 2858, 2870, 2884, 2896,
2910, 2924, 2938, 2952, 2966, 2980, 2994, 3010,
3024, 3040, 3056, 3070, 3086, 3104, 3120, 3136,
3154, 3170, 3188, 3206, 3224, 3242, 3262, 3280,
3300, 3320, 3338, 3360, 3380, 3400, 3422, 3442,
3464, 3486, 3508, 3532, 3554, 3578, 3602, 3626,
3652, 3676, 3702, 3728, 3754, 3780, 3808, 3836,
3864, 3892, 3920, 3950, 3980, 4010, 4042, 4074,
4106, 4138, 4172, 4206, 4240, 4276, 4312, 4348,
4384, 4422, 4460, 4500, 4540, 4580, 4622, 4664,
4708, 4752, 4796, 4842, 4890, 4938, 4986, 5036,
5086, 5138, 5192, 5246, 5300, 5358, 5416, 5474,
5534, 5596, 5660, 5726, 5792, 5860, 5930, 6002,
6074, 6150, 6226, 6306, 6388, 6470, 6556, 6644,
6736, 6828, 6924, 7022, 7124, 7228, 7336, 7448,
7562, 7680, 7802, 7928, 8058, 8192, 8332, 8476,
8624, 8780, 8940, 9106, 9278, 9458, 9644, 9840,
10042, 10252, 10472, 10702, 10942, 11194, 11458, 11734,
12024, 12328, 12648, 12986, 13342, 13720, 14118, 14540,
14990, 15466, 15976, 16520, 17102, 17726, 18398, 19124,
19908, 20760, 21688, 22702, 23816, 25044, 26404, 27922,
29622, 31540, 33720, 36222, 39116, 42502, 46514, 51334,
57218, 64536, 73830, 85890, 101860, 123198, 151020, 183936,
216220, 243618, 268374, 293022, 319362, 347768, 378864, 412626, 449596,
};
static const int32_t hd_quantize_dither_factors_LF[256] = {
0, 0, 0, 1, 0, 0, 1, 1,
0, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 2, 1, 1, 2, 2, 2, 1,
2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 3,
2, 3, 2, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 4, 3, 4,
4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 5, 4, 4, 5,
4, 5, 5, 5, 5, 5, 5, 5,
5, 5, 6, 5, 5, 6, 5, 6,
6, 6, 6, 6, 6, 6, 6, 7,
6, 7, 7, 7, 7, 7, 7, 7,
7, 7, 8, 8, 8, 8, 8, 8,
8, 9, 9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 11, 11, 11,
11, 11, 12, 12, 12, 12, 13, 13,
13, 14, 14, 14, 15, 15, 15, 15,
16, 16, 17, 17, 17, 18, 18, 18,
19, 19, 20, 21, 21, 22, 22, 23,
23, 24, 25, 26, 26, 27, 28, 29,
30, 31, 32, 33, 34, 35, 36, 37,
39, 40, 42, 43, 45, 47, 49, 51,
53, 55, 58, 60, 63, 66, 69, 73,
76, 80, 85, 89, 95, 100, 106, 113,
119, 128, 136, 146, 156, 168, 182, 196,
213, 232, 254, 279, 307, 340, 380, 425,
480, 545, 626, 724, 847, 1003, 1205, 1471,
1830, 2324, 3015, 3993, 5335, 6956, 8229, 8071,
6850, 6189, 6162, 6585, 7102, 7774, 8441, 9243,
};
static const int16_t hd_quantize_factor_select_offset_LF[257] = {
0, -22, -21, -21, -20, -20, -19, -19,
-18, -18, -17, -17, -16, -16, -15, -14,
-14, -13, -13, -12, -12, -11, -11, -10,
-10, -9, -9, -8, -7, -7, -6, -6,
-5, -5, -4, -4, -3, -3, -2, -1,
-1, 0, 0, 1, 1, 2, 2, 3,
4, 4, 5, 5, 6, 6, 7, 8,
8, 9, 9, 10, 11, 11, 12, 12,
13, 14, 14, 15, 15, 16, 17, 17,
18, 19, 19, 20, 20, 21, 22, 22,
23, 24, 24, 25, 26, 26, 27, 28,
28, 29, 30, 30, 31, 32, 33, 33,
34, 35, 35, 36, 37, 38, 38, 39,
40, 41, 41, 42, 43, 44, 44, 45,
46, 47, 48, 48, 49, 50, 51, 52,
52, 53, 54, 55, 56, 57, 58, 58,
59, 60, 61, 62, 63, 64, 65, 66,
67, 68, 69, 69, 70, 71, 72, 73,
74, 75, 77, 78, 79, 80, 81, 82,
83, 84, 85, 86, 87, 89, 90, 91,
92, 93, 94, 96, 97, 98, 99, 101,
102, 103, 105, 106, 107, 109, 110, 112,
113, 115, 116, 118, 119, 121, 122, 124,
125, 127, 129, 130, 132, 134, 136, 137,
139, 141, 143, 145, 147, 149, 151, 153,
155, 158, 160, 162, 164, 167, 169, 172,
174, 177, 180, 182, 185, 188, 191, 194,
197, 201, 204, 208, 211, 215, 219, 223,
227, 232, 236, 241, 246, 251, 257, 263,
269, 275, 283, 290, 298, 307, 317, 327,
339, 352, 367, 384, 404, 429, 458, 494,
522, 522, 522, 522, 522, 522, 522, 522, 522,
};
static const int32_t hd_quantize_intervals_MLF[33] = {
-21236, 21236, 63830, 106798, 150386, 194832, 240376, 287258,
335726, 386034, 438460, 493308, 550924, 611696, 676082, 744626,
817986, 896968, 982580, 1076118, 1179278, 1294344, 1424504, 1574386,
1751090, 1966260, 2240868, 2617662, 3196432, 4176450, 5658260, 7671068,
10380372,
};
static const int32_t hd_invert_quantize_dither_factors_MLF[33] = {
21236, 21236, 21360, 21608, 21978, 22468, 23076, 23806,
24660, 25648, 26778, 28070, 29544, 31228, 33158, 35386,
37974, 41008, 44606, 48934, 54226, 60840, 69320, 80564,
96140, 119032, 155576, 221218, 357552, 622468, 859344, 1153464, 1555840,
};
static const int32_t hd_quantize_dither_factors_MLF[32] = {
0, 31, 62, 93, 123, 152, 183, 214,
247, 283, 323, 369, 421, 483, 557, 647,
759, 900, 1082, 1323, 1654, 2120, 2811, 3894,
5723, 9136, 16411, 34084, 66229, 59219, 73530, 100594,
};
static const int16_t hd_quantize_factor_select_offset_MLF[33] = {
0, -21, -16, -12, -7, -2, 3, 8,
13, 19, 24, 30, 36, 43, 50, 57,
65, 74, 83, 93, 104, 117, 131, 147,
166, 189, 219, 259, 322, 427, 521, 521, 521,
};
static const int32_t hd_quantize_intervals_MHF[9] = {
-95044, 95044, 295844, 528780, 821332, 1226438, 1890540, 3344850, 6450664,
};
static const int32_t hd_invert_quantize_dither_factors_MHF[9] = {
95044, 95044, 105754, 127180, 165372, 39736, 424366, 1029946, 2075866,
};
static const int32_t hd_quantize_dither_factors_MHF[8] = {
0, 2678, 5357, 9548, -31409, 96158, 151395, 261480,
};
static const int16_t hd_quantize_factor_select_offset_MHF[9] = {
0, -17, 5, 30, 62, 105, 177, 334, 518,
};
static const int32_t hd_quantize_intervals_HF[17] = {
-45754, 45754, 138496, 234896, 337336, 448310, 570738, 708380,
866534, 1053262, 1281958, 1577438, 1993050, 2665984, 3900982, 5902844,
8897462,
};
static const int32_t hd_invert_quantize_dither_factors_HF[17] = {
45754, 45754, 46988, 49412, 53026, 57950, 64478, 73164,
84988, 101740, 126958, 168522, 247092, 425842, 809154, 1192708, 1801910,
};
static const int32_t hd_quantize_dither_factors_HF[16] = {
0, 309, 606, 904, 1231, 1632, 2172, 2956,
4188, 6305, 10391, 19643, 44688, 95828, 95889, 152301,
};
static const int16_t hd_quantize_factor_select_offset_HF[17] = {
0, -18, -8, 2, 13, 25, 38, 53,
70, 90, 115, 147, 192, 264, 398, 521, 521,
};
ConstTables ff_aptx_quant_tables[2][NB_SUBBANDS] = {
{
[LF] = { quantize_intervals_LF,
invert_quantize_dither_factors_LF,
quantize_dither_factors_LF,
quantize_factor_select_offset_LF,
FF_ARRAY_ELEMS(quantize_intervals_LF),
0x11FF, 24 },
[MLF] = { quantize_intervals_MLF,
invert_quantize_dither_factors_MLF,
quantize_dither_factors_MLF,
quantize_factor_select_offset_MLF,
FF_ARRAY_ELEMS(quantize_intervals_MLF),
0x14FF, 12 },
[MHF] = { quantize_intervals_MHF,
invert_quantize_dither_factors_MHF,
quantize_dither_factors_MHF,
quantize_factor_select_offset_MHF,
FF_ARRAY_ELEMS(quantize_intervals_MHF),
0x16FF, 6 },
[HF] = { quantize_intervals_HF,
invert_quantize_dither_factors_HF,
quantize_dither_factors_HF,
quantize_factor_select_offset_HF,
FF_ARRAY_ELEMS(quantize_intervals_HF),
0x15FF, 12 },
},
{
[LF] = { hd_quantize_intervals_LF,
hd_invert_quantize_dither_factors_LF,
hd_quantize_dither_factors_LF,
hd_quantize_factor_select_offset_LF,
FF_ARRAY_ELEMS(hd_quantize_intervals_LF),
0x11FF, 24 },
[MLF] = { hd_quantize_intervals_MLF,
hd_invert_quantize_dither_factors_MLF,
hd_quantize_dither_factors_MLF,
hd_quantize_factor_select_offset_MLF,
FF_ARRAY_ELEMS(hd_quantize_intervals_MLF),
0x14FF, 12 },
[MHF] = { hd_quantize_intervals_MHF,
hd_invert_quantize_dither_factors_MHF,
hd_quantize_dither_factors_MHF,
hd_quantize_factor_select_offset_MHF,
FF_ARRAY_ELEMS(hd_quantize_intervals_MHF),
0x16FF, 6 },
[HF] = { hd_quantize_intervals_HF,
hd_invert_quantize_dither_factors_HF,
hd_quantize_dither_factors_HF,
hd_quantize_factor_select_offset_HF,
FF_ARRAY_ELEMS(hd_quantize_intervals_HF),
0x15FF, 12 },
}
};
static const int16_t quantization_factors[32] = {
2048, 2093, 2139, 2186, 2233, 2282, 2332, 2383,
2435, 2489, 2543, 2599, 2656, 2714, 2774, 2834,
2896, 2960, 3025, 3091, 3158, 3228, 3298, 3371,
3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008,
};
av_always_inline
static void aptx_update_codeword_history(Channel *channel)
{
int32_t cw = ((channel->quantize[0].quantized_sample & 3) << 0) +
((channel->quantize[1].quantized_sample & 2) << 1) +
((channel->quantize[2].quantized_sample & 1) << 3);
channel->codeword_history = (cw << 8) + ((unsigned)channel->codeword_history << 4);
}
void ff_aptx_generate_dither(Channel *channel)
{
int subband;
int64_t m;
int32_t d;
aptx_update_codeword_history(channel);
m = (int64_t)5184443 * (channel->codeword_history >> 7);
d = (m * 4) + (m >> 22);
for (subband = 0; subband < NB_SUBBANDS; subband++)
channel->dither[subband] = (unsigned)d << (23 - 5*subband);
channel->dither_parity = (d >> 25) & 1;
}
static void aptx_invert_quantization(InvertQuantize *invert_quantize,
int32_t quantized_sample, int32_t dither,
ConstTables *tables)
{
int32_t qr, idx, shift, factor_select;
idx = (quantized_sample ^ -(quantized_sample < 0)) + 1;
qr = tables->quantize_intervals[idx] / 2;
if (quantized_sample < 0)
qr = -qr;
qr = rshift64_clip24((qr * (1LL<<32)) + MUL64(dither, tables->invert_quantize_dither_factors[idx]), 32);
invert_quantize->reconstructed_difference = MUL64(invert_quantize->quantization_factor, qr) >> 19;
/* update factor_select */
factor_select = 32620 * invert_quantize->factor_select;
factor_select = rshift32(factor_select + (tables->quantize_factor_select_offset[idx] * (1 << 15)), 15);
invert_quantize->factor_select = av_clip(factor_select, 0, tables->factor_max);
/* update quantization factor */
idx = (invert_quantize->factor_select & 0xFF) >> 3;
shift = (tables->factor_max - invert_quantize->factor_select) >> 8;
invert_quantize->quantization_factor = (quantization_factors[idx] << 11) >> shift;
}
static int32_t *aptx_reconstructed_differences_update(Prediction *prediction,
int32_t reconstructed_difference,
int order)
{
int32_t *rd1 = prediction->reconstructed_differences, *rd2 = rd1 + order;
int p = prediction->pos;
rd1[p] = rd2[p];
prediction->pos = p = (p + 1) % order;
rd2[p] = reconstructed_difference;
return &rd2[p];
}
static void aptx_prediction_filtering(Prediction *prediction,
int32_t reconstructed_difference,
int order)
{
int32_t reconstructed_sample, predictor, srd0;
int32_t *reconstructed_differences;
int64_t predicted_difference = 0;
int i;
reconstructed_sample = av_clip_intp2(reconstructed_difference + prediction->predicted_sample, 23);
predictor = av_clip_intp2((MUL64(prediction->s_weight[0], prediction->previous_reconstructed_sample)
+ MUL64(prediction->s_weight[1], reconstructed_sample)) >> 22, 23);
prediction->previous_reconstructed_sample = reconstructed_sample;
reconstructed_differences = aptx_reconstructed_differences_update(prediction, reconstructed_difference, order);
srd0 = FFDIFFSIGN(reconstructed_difference, 0) * (1 << 23);
for (i = 0; i < order; i++) {
int32_t srd = FF_SIGNBIT(reconstructed_differences[-i-1]) | 1;
prediction->d_weight[i] -= rshift32(prediction->d_weight[i] - srd*srd0, 8);
predicted_difference += MUL64(reconstructed_differences[-i], prediction->d_weight[i]);
}
prediction->predicted_difference = av_clip_intp2(predicted_difference >> 22, 23);
prediction->predicted_sample = av_clip_intp2(predictor + prediction->predicted_difference, 23);
}
static void aptx_process_subband(InvertQuantize *invert_quantize,
Prediction *prediction,
int32_t quantized_sample, int32_t dither,
ConstTables *tables)
{
int32_t sign, same_sign[2], weight[2], sw1, range;
aptx_invert_quantization(invert_quantize, quantized_sample, dither, tables);
sign = FFDIFFSIGN(invert_quantize->reconstructed_difference,
-prediction->predicted_difference);
same_sign[0] = sign * prediction->prev_sign[0];
same_sign[1] = sign * prediction->prev_sign[1];
prediction->prev_sign[0] = prediction->prev_sign[1];
prediction->prev_sign[1] = sign | 1;
range = 0x100000;
sw1 = rshift32(-same_sign[1] * prediction->s_weight[1], 1);
sw1 = (av_clip(sw1, -range, range) & ~0xF) * 16;
range = 0x300000;
weight[0] = 254 * prediction->s_weight[0] + 0x800000*same_sign[0] + sw1;
prediction->s_weight[0] = av_clip(rshift32(weight[0], 8), -range, range);
range = 0x3C0000 - prediction->s_weight[0];
weight[1] = 255 * prediction->s_weight[1] + 0xC00000*same_sign[1];
prediction->s_weight[1] = av_clip(rshift32(weight[1], 8), -range, range);
aptx_prediction_filtering(prediction,
invert_quantize->reconstructed_difference,
tables->prediction_order);
}
void ff_aptx_invert_quantize_and_prediction(Channel *channel, int hd)
{
int subband;
for (subband = 0; subband < NB_SUBBANDS; subband++)
aptx_process_subband(&channel->invert_quantize[subband],
&channel->prediction[subband],
channel->quantize[subband].quantized_sample,
channel->dither[subband],
&ff_aptx_quant_tables[hd][subband]);
}
av_cold int ff_aptx_init(AVCodecContext *avctx)
{
AptXContext *s = avctx->priv_data;
int chan, subband;
if (avctx->ch_layout.nb_channels != 2)
return AVERROR_INVALIDDATA;
s->hd = avctx->codec->id == AV_CODEC_ID_APTX_HD;
s->block_size = s->hd ? 6 : 4;
for (chan = 0; chan < NB_CHANNELS; chan++) {
Channel *channel = &s->channels[chan];
for (subband = 0; subband < NB_SUBBANDS; subband++) {
Prediction *prediction = &channel->prediction[subband];
prediction->prev_sign[0] = 1;
prediction->prev_sign[1] = 1;
}
}
return 0;
}
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