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1597 lines
59 KiB
1597 lines
59 KiB
/* |
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* Copyright (c) 2012 Andrew D'Addesio |
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* Copyright (c) 2013-2014 Mozilla Corporation |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Opus SILK decoder |
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*/ |
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#include <stdint.h> |
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#include "opus.h" |
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typedef struct SilkFrame { |
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int coded; |
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int log_gain; |
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int16_t nlsf[16]; |
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float lpc[16]; |
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float output [2 * SILK_HISTORY]; |
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float lpc_history[2 * SILK_HISTORY]; |
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int primarylag; |
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int prev_voiced; |
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} SilkFrame; |
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struct SilkContext { |
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AVCodecContext *avctx; |
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int output_channels; |
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int midonly; |
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int subframes; |
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int sflength; |
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int flength; |
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int nlsf_interp_factor; |
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enum OpusBandwidth bandwidth; |
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int wb; |
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SilkFrame frame[2]; |
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float prev_stereo_weights[2]; |
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float stereo_weights[2]; |
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int prev_coded_channels; |
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}; |
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static const uint16_t silk_model_stereo_s1[] = { |
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256, 7, 9, 10, 11, 12, 22, 46, 54, 55, 56, 59, 82, 174, 197, 200, |
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201, 202, 210, 234, 244, 245, 246, 247, 249, 256 |
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}; |
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static const uint16_t silk_model_stereo_s2[] = {256, 85, 171, 256}; |
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static const uint16_t silk_model_stereo_s3[] = {256, 51, 102, 154, 205, 256}; |
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static const uint16_t silk_model_mid_only[] = {256, 192, 256}; |
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static const uint16_t silk_model_frame_type_inactive[] = {256, 26, 256}; |
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static const uint16_t silk_model_frame_type_active[] = {256, 24, 98, 246, 256}; |
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static const uint16_t silk_model_gain_highbits[3][9] = { |
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{256, 32, 144, 212, 241, 253, 254, 255, 256}, |
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{256, 2, 19, 64, 124, 186, 233, 252, 256}, |
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{256, 1, 4, 30, 101, 195, 245, 254, 256} |
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}; |
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static const uint16_t silk_model_gain_lowbits[] = {256, 32, 64, 96, 128, 160, 192, 224, 256}; |
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static const uint16_t silk_model_gain_delta[] = { |
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256, 6, 11, 22, 53, 185, 206, 214, 218, 221, 223, 225, 227, 228, 229, 230, |
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231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, |
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247, 248, 249, 250, 251, 252, 253, 254, 255, 256 |
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}; |
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static const uint16_t silk_model_lsf_s1[2][2][33] = { |
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{ |
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{ // NB or MB, unvoiced |
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256, 44, 78, 108, 127, 148, 160, 171, 174, 177, 179, 195, 197, 199, 200, 205, |
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207, 208, 211, 214, 215, 216, 218, 220, 222, 225, 226, 235, 244, 246, 253, 255, 256 |
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}, { // NB or MB, voiced |
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256, 1, 11, 12, 20, 23, 31, 39, 53, 66, 80, 81, 95, 107, 120, 131, |
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142, 154, 165, 175, 185, 196, 204, 213, 221, 228, 236, 237, 238, 244, 245, 251, 256 |
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} |
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}, { |
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{ // WB, unvoiced |
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256, 31, 52, 55, 72, 73, 81, 98, 102, 103, 121, 137, 141, 143, 146, 147, |
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157, 158, 161, 177, 188, 204, 206, 208, 211, 213, 224, 225, 229, 238, 246, 253, 256 |
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}, { // WB, voiced |
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256, 1, 5, 21, 26, 44, 55, 60, 74, 89, 90, 93, 105, 118, 132, 146, |
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152, 166, 178, 180, 186, 187, 199, 211, 222, 232, 235, 245, 250, 251, 252, 253, 256 |
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} |
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} |
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}; |
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static const uint16_t silk_model_lsf_s2[32][10] = { |
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// NB, MB |
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{ 256, 1, 2, 3, 18, 242, 253, 254, 255, 256 }, |
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{ 256, 1, 2, 4, 38, 221, 253, 254, 255, 256 }, |
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{ 256, 1, 2, 6, 48, 197, 252, 254, 255, 256 }, |
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{ 256, 1, 2, 10, 62, 185, 246, 254, 255, 256 }, |
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{ 256, 1, 4, 20, 73, 174, 248, 254, 255, 256 }, |
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{ 256, 1, 4, 21, 76, 166, 239, 254, 255, 256 }, |
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{ 256, 1, 8, 32, 85, 159, 226, 252, 255, 256 }, |
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{ 256, 1, 2, 20, 83, 161, 219, 249, 255, 256 }, |
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|
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// WB |
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{ 256, 1, 2, 3, 12, 244, 253, 254, 255, 256 }, |
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{ 256, 1, 2, 4, 32, 218, 253, 254, 255, 256 }, |
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{ 256, 1, 2, 5, 47, 199, 252, 254, 255, 256 }, |
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{ 256, 1, 2, 12, 61, 187, 252, 254, 255, 256 }, |
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{ 256, 1, 5, 24, 72, 172, 249, 254, 255, 256 }, |
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{ 256, 1, 2, 16, 70, 170, 242, 254, 255, 256 }, |
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{ 256, 1, 2, 17, 78, 165, 226, 251, 255, 256 }, |
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{ 256, 1, 8, 29, 79, 156, 237, 254, 255, 256 } |
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}; |
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static const uint16_t silk_model_lsf_s2_ext[] = { 256, 156, 216, 240, 249, 253, 255, 256 }; |
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static const uint16_t silk_model_lsf_interpolation_offset[] = { 256, 13, 35, 64, 75, 256 }; |
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static const uint16_t silk_model_pitch_highbits[] = { |
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256, 3, 6, 12, 23, 44, 74, 106, 125, 136, 146, 158, 171, 184, 196, 207, |
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216, 224, 231, 237, 241, 243, 245, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 |
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}; |
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static const uint16_t silk_model_pitch_lowbits_nb[]= { 256, 64, 128, 192, 256 }; |
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static const uint16_t silk_model_pitch_lowbits_mb[]= { 256, 43, 85, 128, 171, 213, 256 }; |
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static const uint16_t silk_model_pitch_lowbits_wb[]= { 256, 32, 64, 96, 128, 160, 192, 224, 256 }; |
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static const uint16_t silk_model_pitch_delta[] = { |
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256, 46, 48, 50, 53, 57, 63, 73, 88, 114, 152, 182, 204, 219, 229, 236, |
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242, 246, 250, 252, 254, 256 |
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}; |
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static const uint16_t silk_model_pitch_contour_nb10ms[] = { 256, 143, 193, 256 }; |
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static const uint16_t silk_model_pitch_contour_nb20ms[] = { |
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256, 68, 80, 101, 118, 137, 159, 189, 213, 230, 246, 256 |
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}; |
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static const uint16_t silk_model_pitch_contour_mbwb10ms[] = { |
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256, 91, 137, 176, 195, 209, 221, 229, 236, 242, 247, 252, 256 |
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}; |
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static const uint16_t silk_model_pitch_contour_mbwb20ms[] = { |
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256, 33, 55, 73, 89, 104, 118, 132, 145, 158, 168, 177, 186, 194, 200, 206, |
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212, 217, 221, 225, 229, 232, 235, 238, 240, 242, 244, 246, 248, 250, 252, 253, |
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254, 255, 256 |
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}; |
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static const uint16_t silk_model_ltp_filter[] = { 256, 77, 157, 256 }; |
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static const uint16_t silk_model_ltp_filter0_sel[] = { |
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256, 185, 200, 213, 226, 235, 244, 250, 256 |
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}; |
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static const uint16_t silk_model_ltp_filter1_sel[] = { |
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256, 57, 91, 112, 132, 147, 160, 172, 185, 195, 205, 214, 224, 233, 241, 248, 256 |
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}; |
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static const uint16_t silk_model_ltp_filter2_sel[] = { |
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256, 15, 31, 45, 57, 69, 81, 92, 103, 114, 124, 133, 142, 151, 160, 168, |
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176, 184, 192, 199, 206, 212, 218, 223, 227, 232, 236, 240, 244, 247, 251, 254, 256 |
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}; |
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static const uint16_t silk_model_ltp_scale_index[] = { 256, 128, 192, 256 }; |
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static const uint16_t silk_model_lcg_seed[] = { 256, 64, 128, 192, 256 }; |
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static const uint16_t silk_model_exc_rate[2][10] = { |
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{ 256, 15, 66, 78, 124, 169, 182, 215, 242, 256 }, // unvoiced |
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{ 256, 33, 63, 99, 116, 150, 199, 217, 238, 256 } // voiced |
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}; |
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static const uint16_t silk_model_pulse_count[11][19] = { |
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{ 256, 131, 205, 230, 238, 241, 244, 245, 246, |
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247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
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{ 256, 58, 151, 211, 234, 241, 244, 245, 246, |
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247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
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{ 256, 43, 94, 140, 173, 197, 213, 224, 232, |
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238, 241, 244, 247, 249, 250, 251, 253, 254, 256 }, |
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{ 256, 17, 69, 140, 197, 228, 240, 245, 246, |
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247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
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{ 256, 6, 27, 68, 121, 170, 205, 226, 237, |
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243, 246, 248, 250, 251, 252, 253, 254, 255, 256 }, |
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{ 256, 7, 21, 43, 71, 100, 128, 153, 173, |
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190, 203, 214, 223, 230, 235, 239, 243, 246, 256 }, |
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{ 256, 2, 7, 21, 50, 92, 138, 179, 210, |
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229, 240, 246, 249, 251, 252, 253, 254, 255, 256 }, |
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{ 256, 1, 3, 7, 17, 36, 65, 100, 137, |
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171, 199, 219, 233, 241, 246, 250, 252, 254, 256 }, |
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{ 256, 1, 3, 5, 10, 19, 33, 53, 77, |
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104, 132, 158, 181, 201, 216, 227, 235, 241, 256 }, |
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{ 256, 1, 2, 3, 9, 36, 94, 150, 189, |
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214, 228, 238, 244, 247, 250, 252, 253, 254, 256 }, |
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{ 256, 2, 3, 9, 36, 94, 150, 189, 214, |
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228, 238, 244, 247, 250, 252, 253, 254, 256, 256 } |
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}; |
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static const uint16_t silk_model_pulse_location[4][168] = { |
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{ |
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256, 126, 256, |
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256, 56, 198, 256, |
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256, 25, 126, 230, 256, |
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256, 12, 72, 180, 244, 256, |
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256, 7, 42, 126, 213, 250, 256, |
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256, 4, 24, 83, 169, 232, 253, 256, |
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256, 3, 15, 53, 125, 200, 242, 254, 256, |
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256, 2, 10, 35, 89, 162, 221, 248, 255, 256, |
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256, 2, 7, 24, 63, 126, 191, 233, 251, 255, 256, |
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256, 1, 5, 17, 45, 94, 157, 211, 241, 252, 255, 256, |
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256, 1, 5, 13, 33, 70, 125, 182, 223, 245, 253, 255, 256, |
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256, 1, 4, 11, 26, 54, 98, 151, 199, 232, 248, 254, 255, 256, |
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256, 1, 3, 9, 21, 42, 77, 124, 172, 212, 237, 249, 254, 255, 256, |
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256, 1, 2, 6, 16, 33, 60, 97, 144, 187, 220, 241, 250, 254, 255, 256, |
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256, 1, 2, 3, 11, 25, 47, 80, 120, 163, 201, 229, 245, 253, 254, 255, 256, |
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256, 1, 2, 3, 4, 17, 35, 62, 98, 139, 180, 214, 238, 252, 253, 254, 255, 256 |
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},{ |
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256, 127, 256, |
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256, 53, 202, 256, |
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256, 22, 127, 233, 256, |
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256, 11, 72, 183, 246, 256, |
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256, 6, 41, 127, 215, 251, 256, |
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256, 4, 24, 83, 170, 232, 253, 256, |
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256, 3, 16, 56, 127, 200, 241, 254, 256, |
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256, 3, 12, 39, 92, 162, 218, 246, 255, 256, |
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256, 3, 11, 30, 67, 124, 185, 229, 249, 255, 256, |
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256, 3, 10, 25, 53, 97, 151, 200, 233, 250, 255, 256, |
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256, 1, 8, 21, 43, 77, 123, 171, 209, 237, 251, 255, 256, |
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256, 1, 2, 13, 35, 62, 97, 139, 186, 219, 244, 254, 255, 256, |
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256, 1, 2, 8, 22, 48, 85, 128, 171, 208, 234, 248, 254, 255, 256, |
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256, 1, 2, 6, 16, 36, 67, 107, 149, 189, 220, 240, 250, 254, 255, 256, |
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256, 1, 2, 5, 13, 29, 55, 90, 128, 166, 201, 227, 243, 251, 254, 255, 256, |
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256, 1, 2, 4, 10, 22, 43, 73, 109, 147, 183, 213, 234, 246, 252, 254, 255, 256 |
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},{ |
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256, 127, 256, |
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256, 49, 206, 256, |
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256, 20, 127, 236, 256, |
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256, 11, 71, 184, 246, 256, |
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256, 7, 43, 127, 214, 250, 256, |
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256, 6, 30, 87, 169, 229, 252, 256, |
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256, 5, 23, 62, 126, 194, 236, 252, 256, |
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256, 6, 20, 49, 96, 157, 209, 239, 253, 256, |
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256, 1, 16, 39, 74, 125, 175, 215, 245, 255, 256, |
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256, 1, 2, 23, 55, 97, 149, 195, 236, 254, 255, 256, |
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256, 1, 7, 23, 50, 86, 128, 170, 206, 233, 249, 255, 256, |
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256, 1, 6, 18, 39, 70, 108, 148, 186, 217, 238, 250, 255, 256, |
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256, 1, 4, 13, 30, 56, 90, 128, 166, 200, 226, 243, 252, 255, 256, |
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256, 1, 4, 11, 25, 47, 76, 110, 146, 180, 209, 231, 245, 252, 255, 256, |
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256, 1, 3, 8, 19, 37, 62, 93, 128, 163, 194, 219, 237, 248, 253, 255, 256, |
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256, 1, 2, 6, 15, 30, 51, 79, 111, 145, 177, 205, 226, 241, 250, 254, 255, 256 |
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},{ |
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256, 128, 256, |
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256, 42, 214, 256, |
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256, 21, 128, 235, 256, |
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256, 12, 72, 184, 245, 256, |
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256, 8, 42, 128, 214, 249, 256, |
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256, 8, 31, 86, 176, 231, 251, 256, |
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256, 5, 20, 58, 130, 202, 238, 253, 256, |
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256, 6, 18, 45, 97, 174, 221, 241, 251, 256, |
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256, 6, 25, 53, 88, 128, 168, 203, 231, 250, 256, |
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256, 4, 18, 40, 71, 108, 148, 185, 216, 238, 252, 256, |
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256, 3, 13, 31, 57, 90, 128, 166, 199, 225, 243, 253, 256, |
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256, 2, 10, 23, 44, 73, 109, 147, 183, 212, 233, 246, 254, 256, |
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256, 1, 6, 16, 33, 58, 90, 128, 166, 198, 223, 240, 250, 255, 256, |
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256, 1, 5, 12, 25, 46, 75, 110, 146, 181, 210, 231, 244, 251, 255, 256, |
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256, 1, 3, 8, 18, 35, 60, 92, 128, 164, 196, 221, 238, 248, 253, 255, 256, |
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256, 1, 3, 7, 14, 27, 48, 76, 110, 146, 180, 208, 229, 242, 249, 253, 255, 256 |
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} |
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}; |
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static const uint16_t silk_model_excitation_lsb[] = {256, 136, 256}; |
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static const uint16_t silk_model_excitation_sign[3][2][7][3] = { |
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{ // Inactive |
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{ // Low offset |
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{256, 2, 256}, |
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{256, 207, 256}, |
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{256, 189, 256}, |
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{256, 179, 256}, |
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{256, 174, 256}, |
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{256, 163, 256}, |
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{256, 157, 256} |
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}, { // High offset |
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{256, 58, 256}, |
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{256, 245, 256}, |
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{256, 238, 256}, |
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{256, 232, 256}, |
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{256, 225, 256}, |
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{256, 220, 256}, |
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{256, 211, 256} |
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} |
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}, { // Unvoiced |
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{ // Low offset |
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{256, 1, 256}, |
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{256, 210, 256}, |
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{256, 190, 256}, |
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{256, 178, 256}, |
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{256, 169, 256}, |
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{256, 162, 256}, |
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{256, 152, 256} |
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}, { // High offset |
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{256, 48, 256}, |
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{256, 242, 256}, |
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{256, 235, 256}, |
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{256, 224, 256}, |
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{256, 214, 256}, |
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{256, 205, 256}, |
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{256, 190, 256} |
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} |
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}, { // Voiced |
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{ // Low offset |
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{256, 1, 256}, |
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{256, 162, 256}, |
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{256, 152, 256}, |
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{256, 147, 256}, |
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{256, 144, 256}, |
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{256, 141, 256}, |
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{256, 138, 256} |
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}, { // High offset |
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{256, 8, 256}, |
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{256, 203, 256}, |
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{256, 187, 256}, |
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{256, 176, 256}, |
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{256, 168, 256}, |
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{256, 161, 256}, |
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{256, 154, 256} |
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} |
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} |
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}; |
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static const int16_t silk_stereo_weights[] = { |
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-13732, -10050, -8266, -7526, -6500, -5000, -2950, -820, |
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820, 2950, 5000, 6500, 7526, 8266, 10050, 13732 |
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}; |
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static const uint8_t silk_lsf_s2_model_sel_nbmb[32][10] = { |
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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{ 1, 3, 1, 2, 2, 1, 2, 1, 1, 1 }, |
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{ 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, |
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{ 1, 2, 2, 2, 2, 1, 2, 1, 1, 1 }, |
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{ 2, 3, 3, 3, 3, 2, 2, 2, 2, 2 }, |
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{ 0, 5, 3, 3, 2, 2, 2, 2, 1, 1 }, |
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{ 0, 2, 2, 2, 2, 2, 2, 2, 2, 1 }, |
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{ 2, 3, 6, 4, 4, 4, 5, 4, 5, 5 }, |
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{ 2, 4, 5, 5, 4, 5, 4, 6, 4, 4 }, |
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{ 2, 4, 4, 7, 4, 5, 4, 5, 5, 4 }, |
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{ 4, 3, 3, 3, 2, 3, 2, 2, 2, 2 }, |
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{ 1, 5, 5, 6, 4, 5, 4, 5, 5, 5 }, |
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{ 2, 7, 4, 6, 5, 5, 5, 5, 5, 5 }, |
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{ 2, 7, 5, 5, 5, 5, 5, 6, 5, 4 }, |
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{ 3, 3, 5, 4, 4, 5, 4, 5, 4, 4 }, |
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{ 2, 3, 3, 5, 5, 4, 4, 4, 4, 4 }, |
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{ 2, 4, 4, 6, 4, 5, 4, 5, 5, 5 }, |
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{ 2, 5, 4, 6, 5, 5, 5, 4, 5, 4 }, |
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{ 2, 7, 4, 5, 4, 5, 4, 5, 5, 5 }, |
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{ 2, 5, 4, 6, 7, 6, 5, 6, 5, 4 }, |
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{ 3, 6, 7, 4, 6, 5, 5, 6, 4, 5 }, |
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{ 2, 7, 6, 4, 4, 4, 5, 4, 5, 5 }, |
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{ 4, 5, 5, 4, 6, 6, 5, 6, 5, 4 }, |
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{ 2, 5, 5, 6, 5, 6, 4, 6, 4, 4 }, |
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{ 4, 5, 5, 5, 3, 7, 4, 5, 5, 4 }, |
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{ 2, 3, 4, 5, 5, 6, 4, 5, 5, 4 }, |
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{ 2, 3, 2, 3, 3, 4, 2, 3, 3, 3 }, |
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{ 1, 1, 2, 2, 2, 2, 2, 3, 2, 2 }, |
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{ 4, 5, 5, 6, 6, 6, 5, 6, 4, 5 }, |
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{ 3, 5, 5, 4, 4, 4, 4, 3, 3, 2 }, |
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{ 2, 5, 3, 7, 5, 5, 4, 4, 5, 4 }, |
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{ 4, 4, 5, 4, 5, 6, 5, 6, 5, 4 } |
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}; |
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static const uint8_t silk_lsf_s2_model_sel_wb[32][16] = { |
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{ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
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{ 10, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 8, 11 }, |
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{ 10, 13, 13, 11, 15, 12, 12, 13, 10, 13, 12, 13, 13, 12, 11, 11 }, |
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{ 8, 10, 9, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 9 }, |
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{ 8, 14, 13, 12, 14, 12, 15, 13, 12, 12, 12, 13, 13, 12, 12, 11 }, |
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{ 8, 11, 13, 13, 12, 11, 11, 13, 11, 11, 11, 11, 11, 11, 10, 12 }, |
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{ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
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{ 8, 10, 14, 11, 15, 10, 13, 11, 12, 13, 13, 12, 11, 11, 10, 11 }, |
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{ 8, 14, 10, 14, 14, 12, 13, 12, 14, 13, 12, 12, 13, 11, 11, 11 }, |
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{ 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
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{ 8, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9 }, |
|
{ 10, 10, 11, 12, 13, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 11 }, |
|
{ 10, 10, 11, 11, 12, 11, 11, 11, 11, 11, 11, 11, 11, 10, 9, 11 }, |
|
{ 11, 12, 12, 12, 14, 12, 12, 13, 11, 13, 12, 12, 13, 12, 11, 12 }, |
|
{ 8, 14, 12, 13, 12, 15, 13, 10, 14, 13, 15, 12, 12, 11, 13, 11 }, |
|
{ 8, 9, 8, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 9, 8 }, |
|
{ 9, 14, 13, 15, 13, 12, 13, 11, 12, 13, 12, 12, 12, 11, 11, 12 }, |
|
{ 9, 11, 11, 12, 12, 11, 11, 13, 10, 11, 11, 13, 13, 13, 11, 12 }, |
|
{ 10, 11, 11, 10, 10, 10, 11, 10, 9, 10, 9, 10, 9, 9, 9, 12 }, |
|
{ 8, 10, 11, 13, 11, 11, 10, 10, 10, 9, 9, 8, 8, 8, 8, 8 }, |
|
{ 11, 12, 11, 13, 11, 11, 10, 10, 9, 9, 9, 9, 9, 10, 10, 12 }, |
|
{ 10, 14, 11, 15, 15, 12, 13, 12, 13, 11, 13, 11, 11, 10, 11, 11 }, |
|
{ 10, 11, 13, 14, 14, 11, 13, 11, 12, 12, 11, 11, 11, 11, 10, 12 }, |
|
{ 9, 11, 11, 12, 12, 12, 12, 11, 13, 13, 13, 11, 9, 9, 9, 9 }, |
|
{ 10, 13, 11, 14, 14, 12, 15, 12, 12, 13, 11, 12, 12, 11, 11, 11 }, |
|
{ 8, 14, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
|
{ 8, 14, 14, 11, 13, 10, 13, 13, 11, 12, 12, 15, 15, 12, 12, 12 }, |
|
{ 11, 11, 15, 11, 13, 12, 11, 11, 11, 10, 10, 11, 11, 11, 10, 11 }, |
|
{ 8, 8, 9, 8, 8, 8, 10, 9, 10, 9, 9, 10, 10, 10, 9, 9 }, |
|
{ 8, 11, 10, 13, 11, 11, 10, 11, 10, 9, 8, 8, 9, 8, 8, 9 }, |
|
{ 11, 13, 13, 12, 15, 13, 11, 11, 10, 11, 10, 10, 9, 8, 9, 8 }, |
|
{ 10, 11, 13, 11, 12, 11, 11, 11, 10, 9, 10, 14, 12, 8, 8, 8 } |
|
}; |
|
|
|
static const uint8_t silk_lsf_pred_weights_nbmb[2][9] = { |
|
{179, 138, 140, 148, 151, 149, 153, 151, 163}, |
|
{116, 67, 82, 59, 92, 72, 100, 89, 92} |
|
}; |
|
|
|
static const uint8_t silk_lsf_pred_weights_wb[2][15] = { |
|
{175, 148, 160, 176, 178, 173, 174, 164, 177, 174, 196, 182, 198, 192, 182}, |
|
{ 68, 62, 66, 60, 72, 117, 85, 90, 118, 136, 151, 142, 160, 142, 155} |
|
}; |
|
|
|
static const uint8_t silk_lsf_weight_sel_nbmb[32][9] = { |
|
{ 0, 1, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 1, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 1, 1, 1, 0, 0, 0, 0, 1, 0 }, |
|
{ 0, 1, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 1, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 1, 0, 1, 1, 0, 0, 0, 1, 0 }, |
|
{ 0, 1, 1, 0, 0, 1, 1, 0, 0 }, |
|
{ 0, 0, 1, 1, 0, 1, 0, 1, 1 }, |
|
{ 0, 0, 1, 1, 0, 0, 1, 1, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 1, 0, 1, 1, 1, 1, 1, 0 }, |
|
{ 0, 1, 0, 1, 1, 1, 1, 1, 0 }, |
|
{ 0, 1, 1, 1, 1, 1, 1, 1, 0 }, |
|
{ 1, 0, 1, 1, 0, 1, 1, 1, 1 }, |
|
{ 0, 1, 1, 1, 1, 1, 0, 1, 0 }, |
|
{ 0, 0, 1, 1, 0, 1, 0, 1, 0 }, |
|
{ 0, 0, 1, 1, 1, 0, 1, 1, 1 }, |
|
{ 0, 1, 1, 0, 0, 1, 1, 1, 0 }, |
|
{ 0, 0, 0, 1, 1, 1, 0, 1, 0 }, |
|
{ 0, 1, 1, 0, 0, 1, 0, 1, 0 }, |
|
{ 0, 1, 1, 0, 0, 0, 1, 1, 0 }, |
|
{ 0, 0, 0, 0, 0, 1, 1, 1, 1 }, |
|
{ 0, 0, 1, 1, 0, 0, 0, 1, 1 }, |
|
{ 0, 0, 0, 1, 0, 1, 1, 1, 1 }, |
|
{ 0, 1, 1, 1, 1, 1, 1, 1, 0 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 0, 1, 0, 1, 1, 0, 1, 0 }, |
|
{ 1, 0, 0, 1, 0, 0, 0, 0, 0 }, |
|
{ 0, 0, 0, 1, 1, 0, 1, 0, 1 }, |
|
{ 1, 0, 1, 1, 0, 1, 1, 1, 1 } |
|
}; |
|
|
|
static const uint8_t silk_lsf_weight_sel_wb[32][15] = { |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, |
|
{ 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0 }, |
|
{ 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0 }, |
|
{ 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1 }, |
|
{ 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
|
{ 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0 }, |
|
{ 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0 }, |
|
{ 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0 }, |
|
{ 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1 }, |
|
{ 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 }, |
|
{ 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0 }, |
|
{ 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
|
{ 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0 }, |
|
{ 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0 }, |
|
{ 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0 }, |
|
{ 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
|
{ 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1 }, |
|
{ 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
|
{ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 }, |
|
{ 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 } |
|
}; |
|
|
|
static const uint8_t silk_lsf_codebook_nbmb[32][10] = { |
|
{ 12, 35, 60, 83, 108, 132, 157, 180, 206, 228 }, |
|
{ 15, 32, 55, 77, 101, 125, 151, 175, 201, 225 }, |
|
{ 19, 42, 66, 89, 114, 137, 162, 184, 209, 230 }, |
|
{ 12, 25, 50, 72, 97, 120, 147, 172, 200, 223 }, |
|
{ 26, 44, 69, 90, 114, 135, 159, 180, 205, 225 }, |
|
{ 13, 22, 53, 80, 106, 130, 156, 180, 205, 228 }, |
|
{ 15, 25, 44, 64, 90, 115, 142, 168, 196, 222 }, |
|
{ 19, 24, 62, 82, 100, 120, 145, 168, 190, 214 }, |
|
{ 22, 31, 50, 79, 103, 120, 151, 170, 203, 227 }, |
|
{ 21, 29, 45, 65, 106, 124, 150, 171, 196, 224 }, |
|
{ 30, 49, 75, 97, 121, 142, 165, 186, 209, 229 }, |
|
{ 19, 25, 52, 70, 93, 116, 143, 166, 192, 219 }, |
|
{ 26, 34, 62, 75, 97, 118, 145, 167, 194, 217 }, |
|
{ 25, 33, 56, 70, 91, 113, 143, 165, 196, 223 }, |
|
{ 21, 34, 51, 72, 97, 117, 145, 171, 196, 222 }, |
|
{ 20, 29, 50, 67, 90, 117, 144, 168, 197, 221 }, |
|
{ 22, 31, 48, 66, 95, 117, 146, 168, 196, 222 }, |
|
{ 24, 33, 51, 77, 116, 134, 158, 180, 200, 224 }, |
|
{ 21, 28, 70, 87, 106, 124, 149, 170, 194, 217 }, |
|
{ 26, 33, 53, 64, 83, 117, 152, 173, 204, 225 }, |
|
{ 27, 34, 65, 95, 108, 129, 155, 174, 210, 225 }, |
|
{ 20, 26, 72, 99, 113, 131, 154, 176, 200, 219 }, |
|
{ 34, 43, 61, 78, 93, 114, 155, 177, 205, 229 }, |
|
{ 23, 29, 54, 97, 124, 138, 163, 179, 209, 229 }, |
|
{ 30, 38, 56, 89, 118, 129, 158, 178, 200, 231 }, |
|
{ 21, 29, 49, 63, 85, 111, 142, 163, 193, 222 }, |
|
{ 27, 48, 77, 103, 133, 158, 179, 196, 215, 232 }, |
|
{ 29, 47, 74, 99, 124, 151, 176, 198, 220, 237 }, |
|
{ 33, 42, 61, 76, 93, 121, 155, 174, 207, 225 }, |
|
{ 29, 53, 87, 112, 136, 154, 170, 188, 208, 227 }, |
|
{ 24, 30, 52, 84, 131, 150, 166, 186, 203, 229 }, |
|
{ 37, 48, 64, 84, 104, 118, 156, 177, 201, 230 } |
|
}; |
|
|
|
static const uint8_t silk_lsf_codebook_wb[32][16] = { |
|
{ 7, 23, 38, 54, 69, 85, 100, 116, 131, 147, 162, 178, 193, 208, 223, 239 }, |
|
{ 13, 25, 41, 55, 69, 83, 98, 112, 127, 142, 157, 171, 187, 203, 220, 236 }, |
|
{ 15, 21, 34, 51, 61, 78, 92, 106, 126, 136, 152, 167, 185, 205, 225, 240 }, |
|
{ 10, 21, 36, 50, 63, 79, 95, 110, 126, 141, 157, 173, 189, 205, 221, 237 }, |
|
{ 17, 20, 37, 51, 59, 78, 89, 107, 123, 134, 150, 164, 184, 205, 224, 240 }, |
|
{ 10, 15, 32, 51, 67, 81, 96, 112, 129, 142, 158, 173, 189, 204, 220, 236 }, |
|
{ 8, 21, 37, 51, 65, 79, 98, 113, 126, 138, 155, 168, 179, 192, 209, 218 }, |
|
{ 12, 15, 34, 55, 63, 78, 87, 108, 118, 131, 148, 167, 185, 203, 219, 236 }, |
|
{ 16, 19, 32, 36, 56, 79, 91, 108, 118, 136, 154, 171, 186, 204, 220, 237 }, |
|
{ 11, 28, 43, 58, 74, 89, 105, 120, 135, 150, 165, 180, 196, 211, 226, 241 }, |
|
{ 6, 16, 33, 46, 60, 75, 92, 107, 123, 137, 156, 169, 185, 199, 214, 225 }, |
|
{ 11, 19, 30, 44, 57, 74, 89, 105, 121, 135, 152, 169, 186, 202, 218, 234 }, |
|
{ 12, 19, 29, 46, 57, 71, 88, 100, 120, 132, 148, 165, 182, 199, 216, 233 }, |
|
{ 17, 23, 35, 46, 56, 77, 92, 106, 123, 134, 152, 167, 185, 204, 222, 237 }, |
|
{ 14, 17, 45, 53, 63, 75, 89, 107, 115, 132, 151, 171, 188, 206, 221, 240 }, |
|
{ 9, 16, 29, 40, 56, 71, 88, 103, 119, 137, 154, 171, 189, 205, 222, 237 }, |
|
{ 16, 19, 36, 48, 57, 76, 87, 105, 118, 132, 150, 167, 185, 202, 218, 236 }, |
|
{ 12, 17, 29, 54, 71, 81, 94, 104, 126, 136, 149, 164, 182, 201, 221, 237 }, |
|
{ 15, 28, 47, 62, 79, 97, 115, 129, 142, 155, 168, 180, 194, 208, 223, 238 }, |
|
{ 8, 14, 30, 45, 62, 78, 94, 111, 127, 143, 159, 175, 192, 207, 223, 239 }, |
|
{ 17, 30, 49, 62, 79, 92, 107, 119, 132, 145, 160, 174, 190, 204, 220, 235 }, |
|
{ 14, 19, 36, 45, 61, 76, 91, 108, 121, 138, 154, 172, 189, 205, 222, 238 }, |
|
{ 12, 18, 31, 45, 60, 76, 91, 107, 123, 138, 154, 171, 187, 204, 221, 236 }, |
|
{ 13, 17, 31, 43, 53, 70, 83, 103, 114, 131, 149, 167, 185, 203, 220, 237 }, |
|
{ 17, 22, 35, 42, 58, 78, 93, 110, 125, 139, 155, 170, 188, 206, 224, 240 }, |
|
{ 8, 15, 34, 50, 67, 83, 99, 115, 131, 146, 162, 178, 193, 209, 224, 239 }, |
|
{ 13, 16, 41, 66, 73, 86, 95, 111, 128, 137, 150, 163, 183, 206, 225, 241 }, |
|
{ 17, 25, 37, 52, 63, 75, 92, 102, 119, 132, 144, 160, 175, 191, 212, 231 }, |
|
{ 19, 31, 49, 65, 83, 100, 117, 133, 147, 161, 174, 187, 200, 213, 227, 242 }, |
|
{ 18, 31, 52, 68, 88, 103, 117, 126, 138, 149, 163, 177, 192, 207, 223, 239 }, |
|
{ 16, 29, 47, 61, 76, 90, 106, 119, 133, 147, 161, 176, 193, 209, 224, 240 }, |
|
{ 15, 21, 35, 50, 61, 73, 86, 97, 110, 119, 129, 141, 175, 198, 218, 237 } |
|
}; |
|
|
|
static const uint16_t silk_lsf_min_spacing_nbmb[] = { |
|
250, 3, 6, 3, 3, 3, 4, 3, 3, 3, 461 |
|
}; |
|
|
|
static const uint16_t silk_lsf_min_spacing_wb[] = { |
|
100, 3, 40, 3, 3, 3, 5, 14, 14, 10, 11, 3, 8, 9, 7, 3, 347 |
|
}; |
|
|
|
static const uint8_t silk_lsf_ordering_nbmb[] = { |
|
0, 9, 6, 3, 4, 5, 8, 1, 2, 7 |
|
}; |
|
|
|
static const uint8_t silk_lsf_ordering_wb[] = { |
|
0, 15, 8, 7, 4, 11, 12, 3, 2, 13, 10, 5, 6, 9, 14, 1 |
|
}; |
|
|
|
static const int16_t silk_cosine[] = { /* (0.12) */ |
|
4096, 4095, 4091, 4085, |
|
4076, 4065, 4052, 4036, |
|
4017, 3997, 3973, 3948, |
|
3920, 3889, 3857, 3822, |
|
3784, 3745, 3703, 3659, |
|
3613, 3564, 3513, 3461, |
|
3406, 3349, 3290, 3229, |
|
3166, 3102, 3035, 2967, |
|
2896, 2824, 2751, 2676, |
|
2599, 2520, 2440, 2359, |
|
2276, 2191, 2106, 2019, |
|
1931, 1842, 1751, 1660, |
|
1568, 1474, 1380, 1285, |
|
1189, 1093, 995, 897, |
|
799, 700, 601, 501, |
|
401, 301, 201, 101, |
|
0, -101, -201, -301, |
|
-401, -501, -601, -700, |
|
-799, -897, -995, -1093, |
|
-1189, -1285, -1380, -1474, |
|
-1568, -1660, -1751, -1842, |
|
-1931, -2019, -2106, -2191, |
|
-2276, -2359, -2440, -2520, |
|
-2599, -2676, -2751, -2824, |
|
-2896, -2967, -3035, -3102, |
|
-3166, -3229, -3290, -3349, |
|
-3406, -3461, -3513, -3564, |
|
-3613, -3659, -3703, -3745, |
|
-3784, -3822, -3857, -3889, |
|
-3920, -3948, -3973, -3997, |
|
-4017, -4036, -4052, -4065, |
|
-4076, -4085, -4091, -4095, |
|
-4096 |
|
}; |
|
|
|
static const uint16_t silk_pitch_scale[] = { 4, 6, 8}; |
|
|
|
static const uint16_t silk_pitch_min_lag[] = { 16, 24, 32}; |
|
|
|
static const uint16_t silk_pitch_max_lag[] = {144, 216, 288}; |
|
|
|
static const int8_t silk_pitch_offset_nb10ms[3][2] = { |
|
{ 0, 0}, |
|
{ 1, 0}, |
|
{ 0, 1} |
|
}; |
|
|
|
static const int8_t silk_pitch_offset_nb20ms[11][4] = { |
|
{ 0, 0, 0, 0}, |
|
{ 2, 1, 0, -1}, |
|
{-1, 0, 1, 2}, |
|
{-1, 0, 0, 1}, |
|
{-1, 0, 0, 0}, |
|
{ 0, 0, 0, 1}, |
|
{ 0, 0, 1, 1}, |
|
{ 1, 1, 0, 0}, |
|
{ 1, 0, 0, 0}, |
|
{ 0, 0, 0, -1}, |
|
{ 1, 0, 0, -1} |
|
}; |
|
|
|
static const int8_t silk_pitch_offset_mbwb10ms[12][2] = { |
|
{ 0, 0}, |
|
{ 0, 1}, |
|
{ 1, 0}, |
|
{-1, 1}, |
|
{ 1, -1}, |
|
{-1, 2}, |
|
{ 2, -1}, |
|
{-2, 2}, |
|
{ 2, -2}, |
|
{-2, 3}, |
|
{ 3, -2}, |
|
{-3, 3} |
|
}; |
|
|
|
static const int8_t silk_pitch_offset_mbwb20ms[34][4] = { |
|
{ 0, 0, 0, 0}, |
|
{ 0, 0, 1, 1}, |
|
{ 1, 1, 0, 0}, |
|
{-1, 0, 0, 0}, |
|
{ 0, 0, 0, 1}, |
|
{ 1, 0, 0, 0}, |
|
{-1, 0, 0, 1}, |
|
{ 0, 0, 0, -1}, |
|
{-1, 0, 1, 2}, |
|
{ 1, 0, 0, -1}, |
|
{-2, -1, 1, 2}, |
|
{ 2, 1, 0, -1}, |
|
{-2, 0, 0, 2}, |
|
{-2, 0, 1, 3}, |
|
{ 2, 1, -1, -2}, |
|
{-3, -1, 1, 3}, |
|
{ 2, 0, 0, -2}, |
|
{ 3, 1, 0, -2}, |
|
{-3, -1, 2, 4}, |
|
{-4, -1, 1, 4}, |
|
{ 3, 1, -1, -3}, |
|
{-4, -1, 2, 5}, |
|
{ 4, 2, -1, -3}, |
|
{ 4, 1, -1, -4}, |
|
{-5, -1, 2, 6}, |
|
{ 5, 2, -1, -4}, |
|
{-6, -2, 2, 6}, |
|
{-5, -2, 2, 5}, |
|
{ 6, 2, -1, -5}, |
|
{-7, -2, 3, 8}, |
|
{ 6, 2, -2, -6}, |
|
{ 5, 2, -2, -5}, |
|
{ 8, 3, -2, -7}, |
|
{-9, -3, 3, 9} |
|
}; |
|
|
|
static const int8_t silk_ltp_filter0_taps[8][5] = { |
|
{ 4, 6, 24, 7, 5}, |
|
{ 0, 0, 2, 0, 0}, |
|
{ 12, 28, 41, 13, -4}, |
|
{ -9, 15, 42, 25, 14}, |
|
{ 1, -2, 62, 41, -9}, |
|
{-10, 37, 65, -4, 3}, |
|
{ -6, 4, 66, 7, -8}, |
|
{ 16, 14, 38, -3, 33} |
|
}; |
|
|
|
static const int8_t silk_ltp_filter1_taps[16][5] = { |
|
{ 13, 22, 39, 23, 12}, |
|
{ -1, 36, 64, 27, -6}, |
|
{ -7, 10, 55, 43, 17}, |
|
{ 1, 1, 8, 1, 1}, |
|
{ 6, -11, 74, 53, -9}, |
|
{-12, 55, 76, -12, 8}, |
|
{ -3, 3, 93, 27, -4}, |
|
{ 26, 39, 59, 3, -8}, |
|
{ 2, 0, 77, 11, 9}, |
|
{ -8, 22, 44, -6, 7}, |
|
{ 40, 9, 26, 3, 9}, |
|
{ -7, 20, 101, -7, 4}, |
|
{ 3, -8, 42, 26, 0}, |
|
{-15, 33, 68, 2, 23}, |
|
{ -2, 55, 46, -2, 15}, |
|
{ 3, -1, 21, 16, 41} |
|
}; |
|
|
|
static const int8_t silk_ltp_filter2_taps[32][5] = { |
|
{ -6, 27, 61, 39, 5}, |
|
{-11, 42, 88, 4, 1}, |
|
{ -2, 60, 65, 6, -4}, |
|
{ -1, -5, 73, 56, 1}, |
|
{ -9, 19, 94, 29, -9}, |
|
{ 0, 12, 99, 6, 4}, |
|
{ 8, -19, 102, 46, -13}, |
|
{ 3, 2, 13, 3, 2}, |
|
{ 9, -21, 84, 72, -18}, |
|
{-11, 46, 104, -22, 8}, |
|
{ 18, 38, 48, 23, 0}, |
|
{-16, 70, 83, -21, 11}, |
|
{ 5, -11, 117, 22, -8}, |
|
{ -6, 23, 117, -12, 3}, |
|
{ 3, -8, 95, 28, 4}, |
|
{-10, 15, 77, 60, -15}, |
|
{ -1, 4, 124, 2, -4}, |
|
{ 3, 38, 84, 24, -25}, |
|
{ 2, 13, 42, 13, 31}, |
|
{ 21, -4, 56, 46, -1}, |
|
{ -1, 35, 79, -13, 19}, |
|
{ -7, 65, 88, -9, -14}, |
|
{ 20, 4, 81, 49, -29}, |
|
{ 20, 0, 75, 3, -17}, |
|
{ 5, -9, 44, 92, -8}, |
|
{ 1, -3, 22, 69, 31}, |
|
{ -6, 95, 41, -12, 5}, |
|
{ 39, 67, 16, -4, 1}, |
|
{ 0, -6, 120, 55, -36}, |
|
{-13, 44, 122, 4, -24}, |
|
{ 81, 5, 11, 3, 7}, |
|
{ 2, 0, 9, 10, 88} |
|
}; |
|
|
|
static const uint16_t silk_ltp_scale_factor[] = {15565, 12288, 8192}; |
|
|
|
static const uint8_t silk_shell_blocks[3][2] = { |
|
{ 5, 10}, // NB |
|
{ 8, 15}, // MB |
|
{10, 20} // WB |
|
}; |
|
|
|
static const uint8_t silk_quant_offset[2][2] = { /* (0.23) */ |
|
{25, 60}, // Inactive or Unvoiced |
|
{ 8, 25} // Voiced |
|
}; |
|
|
|
static const int silk_stereo_interp_len[3] = { |
|
64, 96, 128 |
|
}; |
|
|
|
static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17]) |
|
{ |
|
int pass, i; |
|
for (pass = 0; pass < 20; pass++) { |
|
int k, min_diff = 0; |
|
for (i = 0; i < order+1; i++) { |
|
int low = i != 0 ? nlsf[i-1] : 0; |
|
int high = i != order ? nlsf[i] : 32768; |
|
int diff = (high - low) - (min_delta[i]); |
|
|
|
if (diff < min_diff) { |
|
min_diff = diff; |
|
k = i; |
|
|
|
if (pass == 20) |
|
break; |
|
} |
|
} |
|
if (min_diff == 0) /* no issues; stabilized */ |
|
return; |
|
|
|
/* wiggle one or two LSFs */ |
|
if (k == 0) { |
|
/* repel away from lower bound */ |
|
nlsf[0] = min_delta[0]; |
|
} else if (k == order) { |
|
/* repel away from higher bound */ |
|
nlsf[order-1] = 32768 - min_delta[order]; |
|
} else { |
|
/* repel away from current position */ |
|
int min_center = 0, max_center = 32768, center_val; |
|
|
|
/* lower extent */ |
|
for (i = 0; i < k; i++) |
|
min_center += min_delta[i]; |
|
min_center += min_delta[k] >> 1; |
|
|
|
/* upper extent */ |
|
for (i = order; i > k; i--) |
|
max_center -= min_delta[k]; |
|
max_center -= min_delta[k] >> 1; |
|
|
|
/* move apart */ |
|
center_val = nlsf[k - 1] + nlsf[k]; |
|
center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2 |
|
center_val = FFMIN(max_center, FFMAX(min_center, center_val)); |
|
|
|
nlsf[k - 1] = center_val - (min_delta[k] >> 1); |
|
nlsf[k] = nlsf[k - 1] + min_delta[k]; |
|
} |
|
} |
|
|
|
/* resort to the fall-back method, the standard method for LSF stabilization */ |
|
|
|
/* sort; as the LSFs should be nearly sorted, use insertion sort */ |
|
for (i = 1; i < order; i++) { |
|
int j, value = nlsf[i]; |
|
for (j = i - 1; j >= 0 && nlsf[j] > value; j--) |
|
nlsf[j + 1] = nlsf[j]; |
|
nlsf[j + 1] = value; |
|
} |
|
|
|
/* push forwards to increase distance */ |
|
if (nlsf[0] < min_delta[0]) |
|
nlsf[0] = min_delta[0]; |
|
for (i = 1; i < order; i++) |
|
if (nlsf[i] < nlsf[i - 1] + min_delta[i]) |
|
nlsf[i] = nlsf[i - 1] + min_delta[i]; |
|
|
|
/* push backwards to increase distance */ |
|
if (nlsf[order-1] > 32768 - min_delta[order]) |
|
nlsf[order-1] = 32768 - min_delta[order]; |
|
for (i = order-2; i >= 0; i--) |
|
if (nlsf[i] > nlsf[i + 1] - min_delta[i+1]) |
|
nlsf[i] = nlsf[i + 1] - min_delta[i+1]; |
|
|
|
return; |
|
} |
|
|
|
static inline int silk_is_lpc_stable(const int16_t lpc[16], int order) |
|
{ |
|
int k, j, DC_resp = 0; |
|
int32_t lpc32[2][16]; // Q24 |
|
int totalinvgain = 1 << 30; // 1.0 in Q30 |
|
int32_t *row = lpc32[0], *prevrow; |
|
|
|
/* initialize the first row for the Levinson recursion */ |
|
for (k = 0; k < order; k++) { |
|
DC_resp += lpc[k]; |
|
row[k] = lpc[k] * 4096; |
|
} |
|
|
|
if (DC_resp >= 4096) |
|
return 0; |
|
|
|
/* check if prediction gain pushes any coefficients too far */ |
|
for (k = order - 1; 1; k--) { |
|
int rc; // Q31; reflection coefficient |
|
int gaindiv; // Q30; inverse of the gain (the divisor) |
|
int gain; // gain for this reflection coefficient |
|
int fbits; // fractional bits used for the gain |
|
int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv |
|
|
|
if (FFABS(row[k]) > 16773022) |
|
return 0; |
|
|
|
rc = -(row[k] * 128); |
|
gaindiv = (1 << 30) - MULH(rc, rc); |
|
|
|
totalinvgain = MULH(totalinvgain, gaindiv) << 2; |
|
if (k == 0) |
|
return (totalinvgain >= 107374); |
|
|
|
/* approximate 1.0/gaindiv */ |
|
fbits = opus_ilog(gaindiv); |
|
gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q<fbits-16> |
|
error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16); |
|
gain = ((gain << 16) + (error * gain >> 13)); |
|
|
|
/* switch to the next row of the LPC coefficients */ |
|
prevrow = row; |
|
row = lpc32[k & 1]; |
|
|
|
for (j = 0; j < k; j++) { |
|
int x = prevrow[j] - ROUND_MULL(prevrow[k - j - 1], rc, 31); |
|
row[j] = ROUND_MULL(x, gain, fbits); |
|
} |
|
} |
|
} |
|
|
|
static void silk_lsp2poly(const int32_t lsp[16], int32_t pol[16], int half_order) |
|
{ |
|
int i, j; |
|
|
|
pol[0] = 65536; // 1.0 in Q16 |
|
pol[1] = -lsp[0]; |
|
|
|
for (i = 1; i < half_order; i++) { |
|
pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16); |
|
for (j = i; j > 1; j--) |
|
pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16); |
|
|
|
pol[1] -= lsp[2 * i]; |
|
} |
|
} |
|
|
|
static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order) |
|
{ |
|
int i, k; |
|
int32_t lsp[16]; // Q17; 2*cos(LSF) |
|
int32_t p[9], q[9]; // Q16 |
|
int32_t lpc32[16]; // Q17 |
|
int16_t lpc[16]; // Q12 |
|
|
|
/* convert the LSFs to LSPs, i.e. 2*cos(LSF) */ |
|
for (k = 0; k < order; k++) { |
|
int index = nlsf[k] >> 8; |
|
int offset = nlsf[k] & 255; |
|
int k2 = (order == 10) ? silk_lsf_ordering_nbmb[k] : silk_lsf_ordering_wb[k]; |
|
|
|
/* interpolate and round */ |
|
lsp[k2] = silk_cosine[index] * 256; |
|
lsp[k2] += (silk_cosine[index + 1] - silk_cosine[index]) * offset; |
|
lsp[k2] = (lsp[k2] + 4) >> 3; |
|
} |
|
|
|
silk_lsp2poly(lsp , p, order >> 1); |
|
silk_lsp2poly(lsp + 1, q, order >> 1); |
|
|
|
/* reconstruct A(z) */ |
|
for (k = 0; k < order>>1; k++) { |
|
lpc32[k] = -p[k + 1] - p[k] - q[k + 1] + q[k]; |
|
lpc32[order-k-1] = -p[k + 1] - p[k] + q[k + 1] - q[k]; |
|
} |
|
|
|
/* limit the range of the LPC coefficients to each fit within an int16_t */ |
|
for (i = 0; i < 10; i++) { |
|
int j; |
|
unsigned int maxabs = 0; |
|
for (j = 0, k = 0; j < order; j++) { |
|
unsigned int x = FFABS(lpc32[k]); |
|
if (x > maxabs) { |
|
maxabs = x; // Q17 |
|
k = j; |
|
} |
|
} |
|
|
|
maxabs = (maxabs + 16) >> 5; // convert to Q12 |
|
|
|
if (maxabs > 32767) { |
|
/* perform bandwidth expansion */ |
|
unsigned int chirp, chirp_base; // Q16 |
|
maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator |
|
chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2); |
|
|
|
for (k = 0; k < order; k++) { |
|
lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); |
|
chirp = (chirp_base * chirp + 32768) >> 16; |
|
} |
|
} else break; |
|
} |
|
|
|
if (i == 10) { |
|
/* time's up: just clamp */ |
|
for (k = 0; k < order; k++) { |
|
int x = (lpc32[k] + 16) >> 5; |
|
lpc[k] = av_clip_int16(x); |
|
lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits |
|
} |
|
} else { |
|
for (k = 0; k < order; k++) |
|
lpc[k] = (lpc32[k] + 16) >> 5; |
|
} |
|
|
|
/* if the prediction gain causes the LPC filter to become unstable, |
|
apply further bandwidth expansion on the Q17 coefficients */ |
|
for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) { |
|
unsigned int chirp, chirp_base; |
|
chirp_base = chirp = 65536 - (1 << i); |
|
|
|
for (k = 0; k < order; k++) { |
|
lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); |
|
lpc[k] = (lpc32[k] + 16) >> 5; |
|
chirp = (chirp_base * chirp + 32768) >> 16; |
|
} |
|
} |
|
|
|
for (i = 0; i < order; i++) |
|
lpcf[i] = lpc[i] / 4096.0f; |
|
} |
|
|
|
static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame, |
|
OpusRangeCoder *rc, |
|
float lpc_leadin[16], float lpc[16], |
|
int *lpc_order, int *has_lpc_leadin, int voiced) |
|
{ |
|
int i; |
|
int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB |
|
int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices |
|
int16_t lsf_res[16]; // residual as a Q10 value |
|
int16_t nlsf[16]; // Q15 |
|
|
|
*lpc_order = order = s->wb ? 16 : 10; |
|
|
|
/* obtain LSF stage-1 and stage-2 indices */ |
|
lsf_i1 = opus_rc_getsymbol(rc, silk_model_lsf_s1[s->wb][voiced]); |
|
for (i = 0; i < order; i++) { |
|
int index = s->wb ? silk_lsf_s2_model_sel_wb [lsf_i1][i] : |
|
silk_lsf_s2_model_sel_nbmb[lsf_i1][i]; |
|
lsf_i2[i] = opus_rc_getsymbol(rc, silk_model_lsf_s2[index]) - 4; |
|
if (lsf_i2[i] == -4) |
|
lsf_i2[i] -= opus_rc_getsymbol(rc, silk_model_lsf_s2_ext); |
|
else if (lsf_i2[i] == 4) |
|
lsf_i2[i] += opus_rc_getsymbol(rc, silk_model_lsf_s2_ext); |
|
} |
|
|
|
/* reverse the backwards-prediction step */ |
|
for (i = order - 1; i >= 0; i--) { |
|
int qstep = s->wb ? 9830 : 11796; |
|
|
|
lsf_res[i] = lsf_i2[i] * 1024; |
|
if (lsf_i2[i] < 0) lsf_res[i] += 102; |
|
else if (lsf_i2[i] > 0) lsf_res[i] -= 102; |
|
lsf_res[i] = (lsf_res[i] * qstep) >> 16; |
|
|
|
if (i + 1 < order) { |
|
int weight = s->wb ? silk_lsf_pred_weights_wb [silk_lsf_weight_sel_wb [lsf_i1][i]][i] : |
|
silk_lsf_pred_weights_nbmb[silk_lsf_weight_sel_nbmb[lsf_i1][i]][i]; |
|
lsf_res[i] += (lsf_res[i+1] * weight) >> 8; |
|
} |
|
} |
|
|
|
/* reconstruct the NLSF coefficients from the supplied indices */ |
|
for (i = 0; i < order; i++) { |
|
const uint8_t * codebook = s->wb ? silk_lsf_codebook_wb [lsf_i1] : |
|
silk_lsf_codebook_nbmb[lsf_i1]; |
|
int cur, prev, next, weight_sq, weight, ipart, fpart, y, value; |
|
|
|
/* find the weight of the residual */ |
|
/* TODO: precompute */ |
|
cur = codebook[i]; |
|
prev = i ? codebook[i - 1] : 0; |
|
next = i + 1 < order ? codebook[i + 1] : 256; |
|
weight_sq = (1024 / (cur - prev) + 1024 / (next - cur)) << 16; |
|
|
|
/* approximate square-root with mandated fixed-point arithmetic */ |
|
ipart = opus_ilog(weight_sq); |
|
fpart = (weight_sq >> (ipart-8)) & 127; |
|
y = ((ipart & 1) ? 32768 : 46214) >> ((32 - ipart)>>1); |
|
weight = y + ((213 * fpart * y) >> 16); |
|
|
|
value = cur * 128 + (lsf_res[i] * 16384) / weight; |
|
nlsf[i] = av_clip(value, 0, 32767); |
|
} |
|
|
|
/* stabilize the NLSF coefficients */ |
|
silk_stabilize_lsf(nlsf, order, s->wb ? silk_lsf_min_spacing_wb : |
|
silk_lsf_min_spacing_nbmb); |
|
|
|
/* produce an interpolation for the first 2 subframes, */ |
|
/* and then convert both sets of NLSFs to LPC coefficients */ |
|
*has_lpc_leadin = 0; |
|
if (s->subframes == 4) { |
|
int offset = opus_rc_getsymbol(rc, silk_model_lsf_interpolation_offset); |
|
if (offset != 4 && frame->coded) { |
|
*has_lpc_leadin = 1; |
|
if (offset != 0) { |
|
int16_t nlsf_leadin[16]; |
|
for (i = 0; i < order; i++) |
|
nlsf_leadin[i] = frame->nlsf[i] + |
|
((nlsf[i] - frame->nlsf[i]) * offset >> 2); |
|
silk_lsf2lpc(nlsf_leadin, lpc_leadin, order); |
|
} else /* avoid re-computation for a (roughly) 1-in-4 occurrence */ |
|
memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float)); |
|
} else |
|
offset = 4; |
|
s->nlsf_interp_factor = offset; |
|
|
|
silk_lsf2lpc(nlsf, lpc, order); |
|
} else { |
|
s->nlsf_interp_factor = 4; |
|
silk_lsf2lpc(nlsf, lpc, order); |
|
} |
|
|
|
memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0])); |
|
memcpy(frame->lpc, lpc, order * sizeof(lpc[0])); |
|
} |
|
|
|
static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total, |
|
int32_t child[2]) |
|
{ |
|
if (total != 0) { |
|
child[0] = opus_rc_getsymbol(rc, |
|
silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1)); |
|
child[1] = total - child[0]; |
|
} else { |
|
child[0] = 0; |
|
child[1] = 0; |
|
} |
|
} |
|
|
|
static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc, |
|
float* excitationf, |
|
int qoffset_high, int active, int voiced) |
|
{ |
|
int i; |
|
uint32_t seed; |
|
int shellblocks; |
|
int ratelevel; |
|
uint8_t pulsecount[20]; // total pulses in each shell block |
|
uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block |
|
int32_t excitation[320]; // Q23 |
|
|
|
/* excitation parameters */ |
|
seed = opus_rc_getsymbol(rc, silk_model_lcg_seed); |
|
shellblocks = silk_shell_blocks[s->bandwidth][s->subframes >> 2]; |
|
ratelevel = opus_rc_getsymbol(rc, silk_model_exc_rate[voiced]); |
|
|
|
for (i = 0; i < shellblocks; i++) { |
|
pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[ratelevel]); |
|
if (pulsecount[i] == 17) { |
|
while (pulsecount[i] == 17 && ++lsbcount[i] != 10) |
|
pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[9]); |
|
if (lsbcount[i] == 10) |
|
pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[10]); |
|
} |
|
} |
|
|
|
/* decode pulse locations using PVQ */ |
|
for (i = 0; i < shellblocks; i++) { |
|
if (pulsecount[i] != 0) { |
|
int a, b, c, d; |
|
int32_t * location = excitation + 16*i; |
|
int32_t branch[4][2]; |
|
branch[0][0] = pulsecount[i]; |
|
|
|
/* unrolled tail recursion */ |
|
for (a = 0; a < 1; a++) { |
|
silk_count_children(rc, 0, branch[0][a], branch[1]); |
|
for (b = 0; b < 2; b++) { |
|
silk_count_children(rc, 1, branch[1][b], branch[2]); |
|
for (c = 0; c < 2; c++) { |
|
silk_count_children(rc, 2, branch[2][c], branch[3]); |
|
for (d = 0; d < 2; d++) { |
|
silk_count_children(rc, 3, branch[3][d], location); |
|
location += 2; |
|
} |
|
} |
|
} |
|
} |
|
} else |
|
memset(excitation + 16*i, 0, 16*sizeof(int32_t)); |
|
} |
|
|
|
/* decode least significant bits */ |
|
for (i = 0; i < shellblocks << 4; i++) { |
|
int bit; |
|
for (bit = 0; bit < lsbcount[i >> 4]; bit++) |
|
excitation[i] = (excitation[i] << 1) | |
|
opus_rc_getsymbol(rc, silk_model_excitation_lsb); |
|
} |
|
|
|
/* decode signs */ |
|
for (i = 0; i < shellblocks << 4; i++) { |
|
if (excitation[i] != 0) { |
|
int sign = opus_rc_getsymbol(rc, silk_model_excitation_sign[active + |
|
voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]); |
|
if (sign == 0) |
|
excitation[i] *= -1; |
|
} |
|
} |
|
|
|
/* assemble the excitation */ |
|
for (i = 0; i < shellblocks << 4; i++) { |
|
int value = excitation[i]; |
|
excitation[i] = value * 256 | silk_quant_offset[voiced][qoffset_high]; |
|
if (value < 0) excitation[i] += 20; |
|
else if (value > 0) excitation[i] -= 20; |
|
|
|
/* invert samples pseudorandomly */ |
|
seed = 196314165 * seed + 907633515; |
|
if (seed & 0x80000000) |
|
excitation[i] *= -1; |
|
seed += value; |
|
|
|
excitationf[i] = excitation[i] / 8388608.0f; |
|
} |
|
} |
|
|
|
/** Maximum residual history according to 4.2.7.6.1 */ |
|
#define SILK_MAX_LAG (288 + LTP_ORDER / 2) |
|
|
|
/** Order of the LTP filter */ |
|
#define LTP_ORDER 5 |
|
|
|
static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc, |
|
int frame_num, int channel, int coded_channels, int active, int active1) |
|
{ |
|
/* per frame */ |
|
int voiced; // combines with active to indicate inactive, active, or active+voiced |
|
int qoffset_high; |
|
int order; // order of the LPC coefficients |
|
float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY]; |
|
int has_lpc_leadin; |
|
float ltpscale; |
|
|
|
/* per subframe */ |
|
struct { |
|
float gain; |
|
int pitchlag; |
|
float ltptaps[5]; |
|
} sf[4]; |
|
|
|
SilkFrame * const frame = s->frame + channel; |
|
|
|
int i; |
|
|
|
/* obtain stereo weights */ |
|
if (coded_channels == 2 && channel == 0) { |
|
int n, wi[2], ws[2], w[2]; |
|
n = opus_rc_getsymbol(rc, silk_model_stereo_s1); |
|
wi[0] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n / 5); |
|
ws[0] = opus_rc_getsymbol(rc, silk_model_stereo_s3); |
|
wi[1] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n % 5); |
|
ws[1] = opus_rc_getsymbol(rc, silk_model_stereo_s3); |
|
|
|
for (i = 0; i < 2; i++) |
|
w[i] = silk_stereo_weights[wi[i]] + |
|
(((silk_stereo_weights[wi[i] + 1] - silk_stereo_weights[wi[i]]) * 6554) >> 16) |
|
* (ws[i]*2 + 1); |
|
|
|
s->stereo_weights[0] = (w[0] - w[1]) / 8192.0; |
|
s->stereo_weights[1] = w[1] / 8192.0; |
|
|
|
/* and read the mid-only flag */ |
|
s->midonly = active1 ? 0 : opus_rc_getsymbol(rc, silk_model_mid_only); |
|
} |
|
|
|
/* obtain frame type */ |
|
if (!active) { |
|
qoffset_high = opus_rc_getsymbol(rc, silk_model_frame_type_inactive); |
|
voiced = 0; |
|
} else { |
|
int type = opus_rc_getsymbol(rc, silk_model_frame_type_active); |
|
qoffset_high = type & 1; |
|
voiced = type >> 1; |
|
} |
|
|
|
/* obtain subframe quantization gains */ |
|
for (i = 0; i < s->subframes; i++) { |
|
int log_gain; //Q7 |
|
int ipart, fpart, lingain; |
|
|
|
if (i == 0 && (frame_num == 0 || !frame->coded)) { |
|
/* gain is coded absolute */ |
|
int x = opus_rc_getsymbol(rc, silk_model_gain_highbits[active + voiced]); |
|
log_gain = (x<<3) | opus_rc_getsymbol(rc, silk_model_gain_lowbits); |
|
|
|
if (frame->coded) |
|
log_gain = FFMAX(log_gain, frame->log_gain - 16); |
|
} else { |
|
/* gain is coded relative */ |
|
int delta_gain = opus_rc_getsymbol(rc, silk_model_gain_delta); |
|
log_gain = av_clip(FFMAX((delta_gain<<1) - 16, |
|
frame->log_gain + delta_gain - 4), 0, 63); |
|
} |
|
|
|
frame->log_gain = log_gain; |
|
|
|
/* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */ |
|
log_gain = (log_gain * 0x1D1C71 >> 16) + 2090; |
|
ipart = log_gain >> 7; |
|
fpart = log_gain & 127; |
|
lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<<ipart) >> 7); |
|
sf[i].gain = lingain / 65536.0f; |
|
} |
|
|
|
/* obtain LPC filter coefficients */ |
|
silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced); |
|
|
|
/* obtain pitch lags, if this is a voiced frame */ |
|
if (voiced) { |
|
int lag_absolute = (!frame_num || !frame->prev_voiced); |
|
int primarylag; // primary pitch lag for the entire SILK frame |
|
int ltpfilter; |
|
const int8_t * offsets; |
|
|
|
if (!lag_absolute) { |
|
int delta = opus_rc_getsymbol(rc, silk_model_pitch_delta); |
|
if (delta) |
|
primarylag = frame->primarylag + delta - 9; |
|
else |
|
lag_absolute = 1; |
|
} |
|
|
|
if (lag_absolute) { |
|
/* primary lag is coded absolute */ |
|
int highbits, lowbits; |
|
const uint16_t *model[] = { |
|
silk_model_pitch_lowbits_nb, silk_model_pitch_lowbits_mb, |
|
silk_model_pitch_lowbits_wb |
|
}; |
|
highbits = opus_rc_getsymbol(rc, silk_model_pitch_highbits); |
|
lowbits = opus_rc_getsymbol(rc, model[s->bandwidth]); |
|
|
|
primarylag = silk_pitch_min_lag[s->bandwidth] + |
|
highbits*silk_pitch_scale[s->bandwidth] + lowbits; |
|
} |
|
frame->primarylag = primarylag; |
|
|
|
if (s->subframes == 2) |
|
offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) |
|
? silk_pitch_offset_nb10ms[opus_rc_getsymbol(rc, |
|
silk_model_pitch_contour_nb10ms)] |
|
: silk_pitch_offset_mbwb10ms[opus_rc_getsymbol(rc, |
|
silk_model_pitch_contour_mbwb10ms)]; |
|
else |
|
offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) |
|
? silk_pitch_offset_nb20ms[opus_rc_getsymbol(rc, |
|
silk_model_pitch_contour_nb20ms)] |
|
: silk_pitch_offset_mbwb20ms[opus_rc_getsymbol(rc, |
|
silk_model_pitch_contour_mbwb20ms)]; |
|
|
|
for (i = 0; i < s->subframes; i++) |
|
sf[i].pitchlag = av_clip(primarylag + offsets[i], |
|
silk_pitch_min_lag[s->bandwidth], |
|
silk_pitch_max_lag[s->bandwidth]); |
|
|
|
/* obtain LTP filter coefficients */ |
|
ltpfilter = opus_rc_getsymbol(rc, silk_model_ltp_filter); |
|
for (i = 0; i < s->subframes; i++) { |
|
int index, j; |
|
const uint16_t *filter_sel[] = { |
|
silk_model_ltp_filter0_sel, silk_model_ltp_filter1_sel, |
|
silk_model_ltp_filter2_sel |
|
}; |
|
const int8_t (*filter_taps[])[5] = { |
|
silk_ltp_filter0_taps, silk_ltp_filter1_taps, silk_ltp_filter2_taps |
|
}; |
|
index = opus_rc_getsymbol(rc, filter_sel[ltpfilter]); |
|
for (j = 0; j < 5; j++) |
|
sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f; |
|
} |
|
} |
|
|
|
/* obtain LTP scale factor */ |
|
if (voiced && frame_num == 0) |
|
ltpscale = silk_ltp_scale_factor[opus_rc_getsymbol(rc, |
|
silk_model_ltp_scale_index)] / 16384.0f; |
|
else ltpscale = 15565.0f/16384.0f; |
|
|
|
/* generate the excitation signal for the entire frame */ |
|
silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high, |
|
active, voiced); |
|
|
|
/* skip synthesising the side channel if we want mono-only */ |
|
if (s->output_channels == channel) |
|
return; |
|
|
|
/* generate the output signal */ |
|
for (i = 0; i < s->subframes; i++) { |
|
const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body; |
|
float *dst = frame->output + SILK_HISTORY + i * s->sflength; |
|
float *resptr = residual + SILK_MAX_LAG + i * s->sflength; |
|
float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength; |
|
float sum; |
|
int j, k; |
|
|
|
if (voiced) { |
|
int out_end; |
|
float scale; |
|
|
|
if (i < 2 || s->nlsf_interp_factor == 4) { |
|
out_end = -i * s->sflength; |
|
scale = ltpscale; |
|
} else { |
|
out_end = -(i - 2) * s->sflength; |
|
scale = 1.0f; |
|
} |
|
|
|
/* when the LPC coefficients change, a re-whitening filter is used */ |
|
/* to produce a residual that accounts for the change */ |
|
for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) { |
|
sum = dst[j]; |
|
for (k = 0; k < order; k++) |
|
sum -= lpc_coeff[k] * dst[j - k - 1]; |
|
resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain; |
|
} |
|
|
|
if (out_end) { |
|
float rescale = sf[i-1].gain / sf[i].gain; |
|
for (j = out_end; j < 0; j++) |
|
resptr[j] *= rescale; |
|
} |
|
|
|
/* LTP synthesis */ |
|
for (j = 0; j < s->sflength; j++) { |
|
sum = resptr[j]; |
|
for (k = 0; k < LTP_ORDER; k++) |
|
sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k]; |
|
resptr[j] = sum; |
|
} |
|
} |
|
|
|
/* LPC synthesis */ |
|
for (j = 0; j < s->sflength; j++) { |
|
sum = resptr[j] * sf[i].gain; |
|
for (k = 1; k <= order; k++) |
|
sum += lpc_coeff[k - 1] * lpc[j - k]; |
|
|
|
lpc[j] = sum; |
|
dst[j] = av_clipf(sum, -1.0f, 1.0f); |
|
} |
|
} |
|
|
|
frame->prev_voiced = voiced; |
|
memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float)); |
|
memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float)); |
|
|
|
frame->coded = 1; |
|
} |
|
|
|
static void silk_unmix_ms(SilkContext *s, float *l, float *r) |
|
{ |
|
float *mid = s->frame[0].output + SILK_HISTORY - s->flength; |
|
float *side = s->frame[1].output + SILK_HISTORY - s->flength; |
|
float w0_prev = s->prev_stereo_weights[0]; |
|
float w1_prev = s->prev_stereo_weights[1]; |
|
float w0 = s->stereo_weights[0]; |
|
float w1 = s->stereo_weights[1]; |
|
int n1 = silk_stereo_interp_len[s->bandwidth]; |
|
int i; |
|
|
|
for (i = 0; i < n1; i++) { |
|
float interp0 = w0_prev + i * (w0 - w0_prev) / n1; |
|
float interp1 = w1_prev + i * (w1 - w1_prev) / n1; |
|
float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); |
|
|
|
l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0); |
|
r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0); |
|
} |
|
|
|
for (; i < s->flength; i++) { |
|
float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); |
|
|
|
l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0); |
|
r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0); |
|
} |
|
|
|
memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights)); |
|
} |
|
|
|
static void silk_flush_frame(SilkFrame *frame) |
|
{ |
|
if (!frame->coded) |
|
return; |
|
|
|
memset(frame->output, 0, sizeof(frame->output)); |
|
memset(frame->lpc_history, 0, sizeof(frame->lpc_history)); |
|
|
|
memset(frame->lpc, 0, sizeof(frame->lpc)); |
|
memset(frame->nlsf, 0, sizeof(frame->nlsf)); |
|
|
|
frame->log_gain = 0; |
|
|
|
frame->primarylag = 0; |
|
frame->prev_voiced = 0; |
|
frame->coded = 0; |
|
} |
|
|
|
int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc, |
|
float *output[2], |
|
enum OpusBandwidth bandwidth, |
|
int coded_channels, |
|
int duration_ms) |
|
{ |
|
int active[2][6], redundancy[2]; |
|
int nb_frames, i, j; |
|
|
|
if (bandwidth > OPUS_BANDWIDTH_WIDEBAND || |
|
coded_channels > 2 || duration_ms > 60) { |
|
av_log(s->avctx, AV_LOG_ERROR, "Invalid parameters passed " |
|
"to the SILK decoder.\n"); |
|
return AVERROR(EINVAL); |
|
} |
|
|
|
nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40); |
|
s->subframes = duration_ms / nb_frames / 5; // 5ms subframes |
|
s->sflength = 20 * (bandwidth + 2); |
|
s->flength = s->sflength * s->subframes; |
|
s->bandwidth = bandwidth; |
|
s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND; |
|
|
|
/* make sure to flush the side channel when switching from mono to stereo */ |
|
if (coded_channels > s->prev_coded_channels) |
|
silk_flush_frame(&s->frame[1]); |
|
s->prev_coded_channels = coded_channels; |
|
|
|
/* read the LP-layer header bits */ |
|
for (i = 0; i < coded_channels; i++) { |
|
for (j = 0; j < nb_frames; j++) |
|
active[i][j] = opus_rc_p2model(rc, 1); |
|
|
|
redundancy[i] = opus_rc_p2model(rc, 1); |
|
if (redundancy[i]) { |
|
av_log(s->avctx, AV_LOG_ERROR, "LBRR frames present; this is unsupported\n"); |
|
return AVERROR_PATCHWELCOME; |
|
} |
|
} |
|
|
|
for (i = 0; i < nb_frames; i++) { |
|
for (j = 0; j < coded_channels && !s->midonly; j++) |
|
silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active[1][i]); |
|
|
|
/* reset the side channel if it is not coded */ |
|
if (s->midonly && s->frame[1].coded) |
|
silk_flush_frame(&s->frame[1]); |
|
|
|
if (coded_channels == 1 || s->output_channels == 1) { |
|
for (j = 0; j < s->output_channels; j++) { |
|
memcpy(output[j] + i * s->flength, |
|
s->frame[0].output + SILK_HISTORY - s->flength - 2, |
|
s->flength * sizeof(float)); |
|
} |
|
} else { |
|
silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength); |
|
} |
|
|
|
s->midonly = 0; |
|
} |
|
|
|
return nb_frames * s->flength; |
|
} |
|
|
|
void ff_silk_free(SilkContext **ps) |
|
{ |
|
av_freep(ps); |
|
} |
|
|
|
void ff_silk_flush(SilkContext *s) |
|
{ |
|
silk_flush_frame(&s->frame[0]); |
|
silk_flush_frame(&s->frame[1]); |
|
|
|
memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights)); |
|
} |
|
|
|
int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels) |
|
{ |
|
SilkContext *s; |
|
|
|
if (output_channels != 1 && output_channels != 2) { |
|
av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n", |
|
output_channels); |
|
return AVERROR(EINVAL); |
|
} |
|
|
|
s = av_mallocz(sizeof(*s)); |
|
if (!s) |
|
return AVERROR(ENOMEM); |
|
|
|
s->avctx = avctx; |
|
s->output_channels = output_channels; |
|
|
|
ff_silk_flush(s); |
|
|
|
*ps = s; |
|
|
|
return 0; |
|
}
|
|
|