forked from KolibriOS/kolibrios
1598 lines
59 KiB
C
1598 lines
59 KiB
C
/*
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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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// 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 },
|
|
{ 2, 3, 2, 3, 3, 4, 2, 3, 3, 3 },
|
|
{ 1, 1, 2, 2, 2, 2, 2, 3, 2, 2 },
|
|
{ 4, 5, 5, 6, 6, 6, 5, 6, 4, 5 },
|
|
{ 3, 5, 5, 4, 4, 4, 4, 3, 3, 2 },
|
|
{ 2, 5, 3, 7, 5, 5, 4, 4, 5, 4 },
|
|
{ 4, 4, 5, 4, 5, 6, 5, 6, 5, 4 }
|
|
};
|
|
|
|
static const uint8_t silk_lsf_s2_model_sel_wb[32][16] = {
|
|
{ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
|
|
{ 10, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 8, 11 },
|
|
{ 10, 13, 13, 11, 15, 12, 12, 13, 10, 13, 12, 13, 13, 12, 11, 11 },
|
|
{ 8, 10, 9, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 9 },
|
|
{ 8, 14, 13, 12, 14, 12, 15, 13, 12, 12, 12, 13, 13, 12, 12, 11 },
|
|
{ 8, 11, 13, 13, 12, 11, 11, 13, 11, 11, 11, 11, 11, 11, 10, 12 },
|
|
{ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
|
|
{ 8, 10, 14, 11, 15, 10, 13, 11, 12, 13, 13, 12, 11, 11, 10, 11 },
|
|
{ 8, 14, 10, 14, 14, 12, 13, 12, 14, 13, 12, 12, 13, 11, 11, 11 },
|
|
{ 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
|
|
{ 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[i];
|
|
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_uintp2(value, 15);
|
|
}
|
|
|
|
/* 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_uintp2(FFMAX((delta_gain<<1) - 16,
|
|
frame->log_gain + delta_gain - 4), 6);
|
|
}
|
|
|
|
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;
|
|
}
|