| /* |
| * Copyright (c) 2012 Andrew D'Addesio |
| * Copyright (c) 2013-2014 Mozilla Corporation |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Opus SILK decoder |
| */ |
| |
| #include <stdint.h> |
| |
| #include "opus.h" |
| |
| typedef struct SilkFrame { |
| int coded; |
| int log_gain; |
| int16_t nlsf[16]; |
| float lpc[16]; |
| |
| float output [2 * SILK_HISTORY]; |
| float lpc_history[2 * SILK_HISTORY]; |
| int primarylag; |
| |
| int prev_voiced; |
| } SilkFrame; |
| |
| struct SilkContext { |
| AVCodecContext *avctx; |
| int output_channels; |
| |
| int midonly; |
| int subframes; |
| int sflength; |
| int flength; |
| int nlsf_interp_factor; |
| |
| enum OpusBandwidth bandwidth; |
| int wb; |
| |
| SilkFrame frame[2]; |
| float prev_stereo_weights[2]; |
| float stereo_weights[2]; |
| |
| int prev_coded_channels; |
| }; |
| |
| static const uint16_t silk_model_stereo_s1[] = { |
| 256, 7, 9, 10, 11, 12, 22, 46, 54, 55, 56, 59, 82, 174, 197, 200, |
| 201, 202, 210, 234, 244, 245, 246, 247, 249, 256 |
| }; |
| |
| static const uint16_t silk_model_stereo_s2[] = {256, 85, 171, 256}; |
| |
| static const uint16_t silk_model_stereo_s3[] = {256, 51, 102, 154, 205, 256}; |
| |
| static const uint16_t silk_model_mid_only[] = {256, 192, 256}; |
| |
| static const uint16_t silk_model_frame_type_inactive[] = {256, 26, 256}; |
| |
| static const uint16_t silk_model_frame_type_active[] = {256, 24, 98, 246, 256}; |
| |
| static const uint16_t silk_model_gain_highbits[3][9] = { |
| {256, 32, 144, 212, 241, 253, 254, 255, 256}, |
| {256, 2, 19, 64, 124, 186, 233, 252, 256}, |
| {256, 1, 4, 30, 101, 195, 245, 254, 256} |
| }; |
| |
| static const uint16_t silk_model_gain_lowbits[] = {256, 32, 64, 96, 128, 160, 192, 224, 256}; |
| |
| static const uint16_t silk_model_gain_delta[] = { |
| 256, 6, 11, 22, 53, 185, 206, 214, 218, 221, 223, 225, 227, 228, 229, 230, |
| 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, |
| 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 |
| }; |
| static const uint16_t silk_model_lsf_s1[2][2][33] = { |
| { |
| { // NB or MB, unvoiced |
| 256, 44, 78, 108, 127, 148, 160, 171, 174, 177, 179, 195, 197, 199, 200, 205, |
| 207, 208, 211, 214, 215, 216, 218, 220, 222, 225, 226, 235, 244, 246, 253, 255, 256 |
| }, { // NB or MB, voiced |
| 256, 1, 11, 12, 20, 23, 31, 39, 53, 66, 80, 81, 95, 107, 120, 131, |
| 142, 154, 165, 175, 185, 196, 204, 213, 221, 228, 236, 237, 238, 244, 245, 251, 256 |
| } |
| }, { |
| { // WB, unvoiced |
| 256, 31, 52, 55, 72, 73, 81, 98, 102, 103, 121, 137, 141, 143, 146, 147, |
| 157, 158, 161, 177, 188, 204, 206, 208, 211, 213, 224, 225, 229, 238, 246, 253, 256 |
| }, { // WB, voiced |
| 256, 1, 5, 21, 26, 44, 55, 60, 74, 89, 90, 93, 105, 118, 132, 146, |
| 152, 166, 178, 180, 186, 187, 199, 211, 222, 232, 235, 245, 250, 251, 252, 253, 256 |
| } |
| } |
| }; |
| |
| static const uint16_t silk_model_lsf_s2[32][10] = { |
| // NB, MB |
| { 256, 1, 2, 3, 18, 242, 253, 254, 255, 256 }, |
| { 256, 1, 2, 4, 38, 221, 253, 254, 255, 256 }, |
| { 256, 1, 2, 6, 48, 197, 252, 254, 255, 256 }, |
| { 256, 1, 2, 10, 62, 185, 246, 254, 255, 256 }, |
| { 256, 1, 4, 20, 73, 174, 248, 254, 255, 256 }, |
| { 256, 1, 4, 21, 76, 166, 239, 254, 255, 256 }, |
| { 256, 1, 8, 32, 85, 159, 226, 252, 255, 256 }, |
| { 256, 1, 2, 20, 83, 161, 219, 249, 255, 256 }, |
| |
| // WB |
| { 256, 1, 2, 3, 12, 244, 253, 254, 255, 256 }, |
| { 256, 1, 2, 4, 32, 218, 253, 254, 255, 256 }, |
| { 256, 1, 2, 5, 47, 199, 252, 254, 255, 256 }, |
| { 256, 1, 2, 12, 61, 187, 252, 254, 255, 256 }, |
| { 256, 1, 5, 24, 72, 172, 249, 254, 255, 256 }, |
| { 256, 1, 2, 16, 70, 170, 242, 254, 255, 256 }, |
| { 256, 1, 2, 17, 78, 165, 226, 251, 255, 256 }, |
| { 256, 1, 8, 29, 79, 156, 237, 254, 255, 256 } |
| }; |
| |
| static const uint16_t silk_model_lsf_s2_ext[] = { 256, 156, 216, 240, 249, 253, 255, 256 }; |
| |
| static const uint16_t silk_model_lsf_interpolation_offset[] = { 256, 13, 35, 64, 75, 256 }; |
| |
| static const uint16_t silk_model_pitch_highbits[] = { |
| 256, 3, 6, 12, 23, 44, 74, 106, 125, 136, 146, 158, 171, 184, 196, 207, |
| 216, 224, 231, 237, 241, 243, 245, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 |
| }; |
| |
| static const uint16_t silk_model_pitch_lowbits_nb[]= { 256, 64, 128, 192, 256 }; |
| |
| static const uint16_t silk_model_pitch_lowbits_mb[]= { 256, 43, 85, 128, 171, 213, 256 }; |
| |
| static const uint16_t silk_model_pitch_lowbits_wb[]= { 256, 32, 64, 96, 128, 160, 192, 224, 256 }; |
| |
| static const uint16_t silk_model_pitch_delta[] = { |
| 256, 46, 48, 50, 53, 57, 63, 73, 88, 114, 152, 182, 204, 219, 229, 236, |
| 242, 246, 250, 252, 254, 256 |
| }; |
| |
| static const uint16_t silk_model_pitch_contour_nb10ms[] = { 256, 143, 193, 256 }; |
| |
| static const uint16_t silk_model_pitch_contour_nb20ms[] = { |
| 256, 68, 80, 101, 118, 137, 159, 189, 213, 230, 246, 256 |
| }; |
| |
| static const uint16_t silk_model_pitch_contour_mbwb10ms[] = { |
| 256, 91, 137, 176, 195, 209, 221, 229, 236, 242, 247, 252, 256 |
| }; |
| |
| static const uint16_t silk_model_pitch_contour_mbwb20ms[] = { |
| 256, 33, 55, 73, 89, 104, 118, 132, 145, 158, 168, 177, 186, 194, 200, 206, |
| 212, 217, 221, 225, 229, 232, 235, 238, 240, 242, 244, 246, 248, 250, 252, 253, |
| 254, 255, 256 |
| }; |
| |
| static const uint16_t silk_model_ltp_filter[] = { 256, 77, 157, 256 }; |
| |
| static const uint16_t silk_model_ltp_filter0_sel[] = { |
| 256, 185, 200, 213, 226, 235, 244, 250, 256 |
| }; |
| |
| static const uint16_t silk_model_ltp_filter1_sel[] = { |
| 256, 57, 91, 112, 132, 147, 160, 172, 185, 195, 205, 214, 224, 233, 241, 248, 256 |
| }; |
| |
| static const uint16_t silk_model_ltp_filter2_sel[] = { |
| 256, 15, 31, 45, 57, 69, 81, 92, 103, 114, 124, 133, 142, 151, 160, 168, |
| 176, 184, 192, 199, 206, 212, 218, 223, 227, 232, 236, 240, 244, 247, 251, 254, 256 |
| }; |
| |
| static const uint16_t silk_model_ltp_scale_index[] = { 256, 128, 192, 256 }; |
| |
| static const uint16_t silk_model_lcg_seed[] = { 256, 64, 128, 192, 256 }; |
| |
| static const uint16_t silk_model_exc_rate[2][10] = { |
| { 256, 15, 66, 78, 124, 169, 182, 215, 242, 256 }, // unvoiced |
| { 256, 33, 63, 99, 116, 150, 199, 217, 238, 256 } // voiced |
| }; |
| |
| static const uint16_t silk_model_pulse_count[11][19] = { |
| { 256, 131, 205, 230, 238, 241, 244, 245, 246, |
| 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
| { 256, 58, 151, 211, 234, 241, 244, 245, 246, |
| 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
| { 256, 43, 94, 140, 173, 197, 213, 224, 232, |
| 238, 241, 244, 247, 249, 250, 251, 253, 254, 256 }, |
| { 256, 17, 69, 140, 197, 228, 240, 245, 246, |
| 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
| { 256, 6, 27, 68, 121, 170, 205, 226, 237, |
| 243, 246, 248, 250, 251, 252, 253, 254, 255, 256 }, |
| { 256, 7, 21, 43, 71, 100, 128, 153, 173, |
| 190, 203, 214, 223, 230, 235, 239, 243, 246, 256 }, |
| { 256, 2, 7, 21, 50, 92, 138, 179, 210, |
| 229, 240, 246, 249, 251, 252, 253, 254, 255, 256 }, |
| { 256, 1, 3, 7, 17, 36, 65, 100, 137, |
| 171, 199, 219, 233, 241, 246, 250, 252, 254, 256 }, |
| { 256, 1, 3, 5, 10, 19, 33, 53, 77, |
| 104, 132, 158, 181, 201, 216, 227, 235, 241, 256 }, |
| { 256, 1, 2, 3, 9, 36, 94, 150, 189, |
| 214, 228, 238, 244, 247, 250, 252, 253, 254, 256 }, |
| { 256, 2, 3, 9, 36, 94, 150, 189, 214, |
| 228, 238, 244, 247, 250, 252, 253, 254, 256, 256 } |
| }; |
| |
| static const uint16_t silk_model_pulse_location[4][168] = { |
| { |
| 256, 126, 256, |
| 256, 56, 198, 256, |
| 256, 25, 126, 230, 256, |
| 256, 12, 72, 180, 244, 256, |
| 256, 7, 42, 126, 213, 250, 256, |
| 256, 4, 24, 83, 169, 232, 253, 256, |
| 256, 3, 15, 53, 125, 200, 242, 254, 256, |
| 256, 2, 10, 35, 89, 162, 221, 248, 255, 256, |
| 256, 2, 7, 24, 63, 126, 191, 233, 251, 255, 256, |
| 256, 1, 5, 17, 45, 94, 157, 211, 241, 252, 255, 256, |
| 256, 1, 5, 13, 33, 70, 125, 182, 223, 245, 253, 255, 256, |
| 256, 1, 4, 11, 26, 54, 98, 151, 199, 232, 248, 254, 255, 256, |
| 256, 1, 3, 9, 21, 42, 77, 124, 172, 212, 237, 249, 254, 255, 256, |
| 256, 1, 2, 6, 16, 33, 60, 97, 144, 187, 220, 241, 250, 254, 255, 256, |
| 256, 1, 2, 3, 11, 25, 47, 80, 120, 163, 201, 229, 245, 253, 254, 255, 256, |
| 256, 1, 2, 3, 4, 17, 35, 62, 98, 139, 180, 214, 238, 252, 253, 254, 255, 256 |
| },{ |
| 256, 127, 256, |
| 256, 53, 202, 256, |
| 256, 22, 127, 233, 256, |
| 256, 11, 72, 183, 246, 256, |
| 256, 6, 41, 127, 215, 251, 256, |
| 256, 4, 24, 83, 170, 232, 253, 256, |
| 256, 3, 16, 56, 127, 200, 241, 254, 256, |
| 256, 3, 12, 39, 92, 162, 218, 246, 255, 256, |
| 256, 3, 11, 30, 67, 124, 185, 229, 249, 255, 256, |
| 256, 3, 10, 25, 53, 97, 151, 200, 233, 250, 255, 256, |
| 256, 1, 8, 21, 43, 77, 123, 171, 209, 237, 251, 255, 256, |
| 256, 1, 2, 13, 35, 62, 97, 139, 186, 219, 244, 254, 255, 256, |
| 256, 1, 2, 8, 22, 48, 85, 128, 171, 208, 234, 248, 254, 255, 256, |
| 256, 1, 2, 6, 16, 36, 67, 107, 149, 189, 220, 240, 250, 254, 255, 256, |
| 256, 1, 2, 5, 13, 29, 55, 90, 128, 166, 201, 227, 243, 251, 254, 255, 256, |
| 256, 1, 2, 4, 10, 22, 43, 73, 109, 147, 183, 213, 234, 246, 252, 254, 255, 256 |
| },{ |
| 256, 127, 256, |
| 256, 49, 206, 256, |
| 256, 20, 127, 236, 256, |
| 256, 11, 71, 184, 246, 256, |
| 256, 7, 43, 127, 214, 250, 256, |
| 256, 6, 30, 87, 169, 229, 252, 256, |
| 256, 5, 23, 62, 126, 194, 236, 252, 256, |
| 256, 6, 20, 49, 96, 157, 209, 239, 253, 256, |
| 256, 1, 16, 39, 74, 125, 175, 215, 245, 255, 256, |
| 256, 1, 2, 23, 55, 97, 149, 195, 236, 254, 255, 256, |
| 256, 1, 7, 23, 50, 86, 128, 170, 206, 233, 249, 255, 256, |
| 256, 1, 6, 18, 39, 70, 108, 148, 186, 217, 238, 250, 255, 256, |
| 256, 1, 4, 13, 30, 56, 90, 128, 166, 200, 226, 243, 252, 255, 256, |
| 256, 1, 4, 11, 25, 47, 76, 110, 146, 180, 209, 231, 245, 252, 255, 256, |
| 256, 1, 3, 8, 19, 37, 62, 93, 128, 163, 194, 219, 237, 248, 253, 255, 256, |
| 256, 1, 2, 6, 15, 30, 51, 79, 111, 145, 177, 205, 226, 241, 250, 254, 255, 256 |
| },{ |
| 256, 128, 256, |
| 256, 42, 214, 256, |
| 256, 21, 128, 235, 256, |
| 256, 12, 72, 184, 245, 256, |
| 256, 8, 42, 128, 214, 249, 256, |
| 256, 8, 31, 86, 176, 231, 251, 256, |
| 256, 5, 20, 58, 130, 202, 238, 253, 256, |
| 256, 6, 18, 45, 97, 174, 221, 241, 251, 256, |
| 256, 6, 25, 53, 88, 128, 168, 203, 231, 250, 256, |
| 256, 4, 18, 40, 71, 108, 148, 185, 216, 238, 252, 256, |
| 256, 3, 13, 31, 57, 90, 128, 166, 199, 225, 243, 253, 256, |
| 256, 2, 10, 23, 44, 73, 109, 147, 183, 212, 233, 246, 254, 256, |
| 256, 1, 6, 16, 33, 58, 90, 128, 166, 198, 223, 240, 250, 255, 256, |
| 256, 1, 5, 12, 25, 46, 75, 110, 146, 181, 210, 231, 244, 251, 255, 256, |
| 256, 1, 3, 8, 18, 35, 60, 92, 128, 164, 196, 221, 238, 248, 253, 255, 256, |
| 256, 1, 3, 7, 14, 27, 48, 76, 110, 146, 180, 208, 229, 242, 249, 253, 255, 256 |
| } |
| }; |
| |
| static const uint16_t silk_model_excitation_lsb[] = {256, 136, 256}; |
| |
| static const uint16_t silk_model_excitation_sign[3][2][7][3] = { |
| { // Inactive |
| { // Low offset |
| {256, 2, 256}, |
| {256, 207, 256}, |
| {256, 189, 256}, |
| {256, 179, 256}, |
| {256, 174, 256}, |
| {256, 163, 256}, |
| {256, 157, 256} |
| }, { // High offset |
| {256, 58, 256}, |
| {256, 245, 256}, |
| {256, 238, 256}, |
| {256, 232, 256}, |
| {256, 225, 256}, |
| {256, 220, 256}, |
| {256, 211, 256} |
| } |
| }, { // Unvoiced |
| { // Low offset |
| {256, 1, 256}, |
| {256, 210, 256}, |
| {256, 190, 256}, |
| {256, 178, 256}, |
| {256, 169, 256}, |
| {256, 162, 256}, |
| {256, 152, 256} |
| }, { // High offset |
| {256, 48, 256}, |
| {256, 242, 256}, |
| {256, 235, 256}, |
| {256, 224, 256}, |
| {256, 214, 256}, |
| {256, 205, 256}, |
| {256, 190, 256} |
| } |
| }, { // Voiced |
| { // Low offset |
| {256, 1, 256}, |
| {256, 162, 256}, |
| {256, 152, 256}, |
| {256, 147, 256}, |
| {256, 144, 256}, |
| {256, 141, 256}, |
| {256, 138, 256} |
| }, { // High offset |
| {256, 8, 256}, |
| {256, 203, 256}, |
| {256, 187, 256}, |
| {256, 176, 256}, |
| {256, 168, 256}, |
| {256, 161, 256}, |
| {256, 154, 256} |
| } |
| } |
| }; |
| |
| static const int16_t silk_stereo_weights[] = { |
| -13732, -10050, -8266, -7526, -6500, -5000, -2950, -820, |
| 820, 2950, 5000, 6500, 7526, 8266, 10050, 13732 |
| }; |
| |
| static const uint8_t silk_lsf_s2_model_sel_nbmb[32][10] = { |
| { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| { 1, 3, 1, 2, 2, 1, 2, 1, 1, 1 }, |
| { 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, |
| { 1, 2, 2, 2, 2, 1, 2, 1, 1, 1 }, |
| { 2, 3, 3, 3, 3, 2, 2, 2, 2, 2 }, |
| { 0, 5, 3, 3, 2, 2, 2, 2, 1, 1 }, |
| { 0, 2, 2, 2, 2, 2, 2, 2, 2, 1 }, |
| { 2, 3, 6, 4, 4, 4, 5, 4, 5, 5 }, |
| { 2, 4, 5, 5, 4, 5, 4, 6, 4, 4 }, |
| { 2, 4, 4, 7, 4, 5, 4, 5, 5, 4 }, |
| { 4, 3, 3, 3, 2, 3, 2, 2, 2, 2 }, |
| { 1, 5, 5, 6, 4, 5, 4, 5, 5, 5 }, |
| { 2, 7, 4, 6, 5, 5, 5, 5, 5, 5 }, |
| { 2, 7, 5, 5, 5, 5, 5, 6, 5, 4 }, |
| { 3, 3, 5, 4, 4, 5, 4, 5, 4, 4 }, |
| { 2, 3, 3, 5, 5, 4, 4, 4, 4, 4 }, |
| { 2, 4, 4, 6, 4, 5, 4, 5, 5, 5 }, |
| { 2, 5, 4, 6, 5, 5, 5, 4, 5, 4 }, |
| { 2, 7, 4, 5, 4, 5, 4, 5, 5, 5 }, |
| { 2, 5, 4, 6, 7, 6, 5, 6, 5, 4 }, |
| { 3, 6, 7, 4, 6, 5, 5, 6, 4, 5 }, |
| { 2, 7, 6, 4, 4, 4, 5, 4, 5, 5 }, |
| { 4, 5, 5, 4, 6, 6, 5, 6, 5, 4 }, |
| { 2, 5, 5, 6, 5, 6, 4, 6, 4, 4 }, |
| { 4, 5, 5, 5, 3, 7, 4, 5, 5, 4 }, |
| { 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; |
| } |
