| 1 | /* |
| 2 | * Copyright (c) 2012 Andrew D'Addesio |
| 3 | * Copyright (c) 2013-2014 Mozilla Corporation |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Opus SILK decoder |
| 25 | */ |
| 26 | |
| 27 | #include <stdint.h> |
| 28 | |
| 29 | #include "opus.h" |
| 30 | |
| 31 | typedef struct SilkFrame { |
| 32 | int coded; |
| 33 | int log_gain; |
| 34 | int16_t nlsf[16]; |
| 35 | float lpc[16]; |
| 36 | |
| 37 | float output [2 * SILK_HISTORY]; |
| 38 | float lpc_history[2 * SILK_HISTORY]; |
| 39 | int primarylag; |
| 40 | |
| 41 | int prev_voiced; |
| 42 | } SilkFrame; |
| 43 | |
| 44 | struct SilkContext { |
| 45 | AVCodecContext *avctx; |
| 46 | int output_channels; |
| 47 | |
| 48 | int midonly; |
| 49 | int subframes; |
| 50 | int sflength; |
| 51 | int flength; |
| 52 | int nlsf_interp_factor; |
| 53 | |
| 54 | enum OpusBandwidth bandwidth; |
| 55 | int wb; |
| 56 | |
| 57 | SilkFrame frame[2]; |
| 58 | float prev_stereo_weights[2]; |
| 59 | float stereo_weights[2]; |
| 60 | |
| 61 | int prev_coded_channels; |
| 62 | }; |
| 63 | |
| 64 | static const uint16_t silk_model_stereo_s1[] = { |
| 65 | 256, 7, 9, 10, 11, 12, 22, 46, 54, 55, 56, 59, 82, 174, 197, 200, |
| 66 | 201, 202, 210, 234, 244, 245, 246, 247, 249, 256 |
| 67 | }; |
| 68 | |
| 69 | static const uint16_t silk_model_stereo_s2[] = {256, 85, 171, 256}; |
| 70 | |
| 71 | static const uint16_t silk_model_stereo_s3[] = {256, 51, 102, 154, 205, 256}; |
| 72 | |
| 73 | static const uint16_t silk_model_mid_only[] = {256, 192, 256}; |
| 74 | |
| 75 | static const uint16_t silk_model_frame_type_inactive[] = {256, 26, 256}; |
| 76 | |
| 77 | static const uint16_t silk_model_frame_type_active[] = {256, 24, 98, 246, 256}; |
| 78 | |
| 79 | static const uint16_t silk_model_gain_highbits[3][9] = { |
| 80 | {256, 32, 144, 212, 241, 253, 254, 255, 256}, |
| 81 | {256, 2, 19, 64, 124, 186, 233, 252, 256}, |
| 82 | {256, 1, 4, 30, 101, 195, 245, 254, 256} |
| 83 | }; |
| 84 | |
| 85 | static const uint16_t silk_model_gain_lowbits[] = {256, 32, 64, 96, 128, 160, 192, 224, 256}; |
| 86 | |
| 87 | static const uint16_t silk_model_gain_delta[] = { |
| 88 | 256, 6, 11, 22, 53, 185, 206, 214, 218, 221, 223, 225, 227, 228, 229, 230, |
| 89 | 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, |
| 90 | 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 |
| 91 | }; |
| 92 | static const uint16_t silk_model_lsf_s1[2][2][33] = { |
| 93 | { |
| 94 | { // NB or MB, unvoiced |
| 95 | 256, 44, 78, 108, 127, 148, 160, 171, 174, 177, 179, 195, 197, 199, 200, 205, |
| 96 | 207, 208, 211, 214, 215, 216, 218, 220, 222, 225, 226, 235, 244, 246, 253, 255, 256 |
| 97 | }, { // NB or MB, voiced |
| 98 | 256, 1, 11, 12, 20, 23, 31, 39, 53, 66, 80, 81, 95, 107, 120, 131, |
| 99 | 142, 154, 165, 175, 185, 196, 204, 213, 221, 228, 236, 237, 238, 244, 245, 251, 256 |
| 100 | } |
| 101 | }, { |
| 102 | { // WB, unvoiced |
| 103 | 256, 31, 52, 55, 72, 73, 81, 98, 102, 103, 121, 137, 141, 143, 146, 147, |
| 104 | 157, 158, 161, 177, 188, 204, 206, 208, 211, 213, 224, 225, 229, 238, 246, 253, 256 |
| 105 | }, { // WB, voiced |
| 106 | 256, 1, 5, 21, 26, 44, 55, 60, 74, 89, 90, 93, 105, 118, 132, 146, |
| 107 | 152, 166, 178, 180, 186, 187, 199, 211, 222, 232, 235, 245, 250, 251, 252, 253, 256 |
| 108 | } |
| 109 | } |
| 110 | }; |
| 111 | |
| 112 | static const uint16_t silk_model_lsf_s2[32][10] = { |
| 113 | // NB, MB |
| 114 | { 256, 1, 2, 3, 18, 242, 253, 254, 255, 256 }, |
| 115 | { 256, 1, 2, 4, 38, 221, 253, 254, 255, 256 }, |
| 116 | { 256, 1, 2, 6, 48, 197, 252, 254, 255, 256 }, |
| 117 | { 256, 1, 2, 10, 62, 185, 246, 254, 255, 256 }, |
| 118 | { 256, 1, 4, 20, 73, 174, 248, 254, 255, 256 }, |
| 119 | { 256, 1, 4, 21, 76, 166, 239, 254, 255, 256 }, |
| 120 | { 256, 1, 8, 32, 85, 159, 226, 252, 255, 256 }, |
| 121 | { 256, 1, 2, 20, 83, 161, 219, 249, 255, 256 }, |
| 122 | |
| 123 | // WB |
| 124 | { 256, 1, 2, 3, 12, 244, 253, 254, 255, 256 }, |
| 125 | { 256, 1, 2, 4, 32, 218, 253, 254, 255, 256 }, |
| 126 | { 256, 1, 2, 5, 47, 199, 252, 254, 255, 256 }, |
| 127 | { 256, 1, 2, 12, 61, 187, 252, 254, 255, 256 }, |
| 128 | { 256, 1, 5, 24, 72, 172, 249, 254, 255, 256 }, |
| 129 | { 256, 1, 2, 16, 70, 170, 242, 254, 255, 256 }, |
| 130 | { 256, 1, 2, 17, 78, 165, 226, 251, 255, 256 }, |
| 131 | { 256, 1, 8, 29, 79, 156, 237, 254, 255, 256 } |
| 132 | }; |
| 133 | |
| 134 | static const uint16_t silk_model_lsf_s2_ext[] = { 256, 156, 216, 240, 249, 253, 255, 256 }; |
| 135 | |
| 136 | static const uint16_t silk_model_lsf_interpolation_offset[] = { 256, 13, 35, 64, 75, 256 }; |
| 137 | |
| 138 | static const uint16_t silk_model_pitch_highbits[] = { |
| 139 | 256, 3, 6, 12, 23, 44, 74, 106, 125, 136, 146, 158, 171, 184, 196, 207, |
| 140 | 216, 224, 231, 237, 241, 243, 245, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 |
| 141 | }; |
| 142 | |
| 143 | static const uint16_t silk_model_pitch_lowbits_nb[]= { 256, 64, 128, 192, 256 }; |
| 144 | |
| 145 | static const uint16_t silk_model_pitch_lowbits_mb[]= { 256, 43, 85, 128, 171, 213, 256 }; |
| 146 | |
| 147 | static const uint16_t silk_model_pitch_lowbits_wb[]= { 256, 32, 64, 96, 128, 160, 192, 224, 256 }; |
| 148 | |
| 149 | static const uint16_t silk_model_pitch_delta[] = { |
| 150 | 256, 46, 48, 50, 53, 57, 63, 73, 88, 114, 152, 182, 204, 219, 229, 236, |
| 151 | 242, 246, 250, 252, 254, 256 |
| 152 | }; |
| 153 | |
| 154 | static const uint16_t silk_model_pitch_contour_nb10ms[] = { 256, 143, 193, 256 }; |
| 155 | |
| 156 | static const uint16_t silk_model_pitch_contour_nb20ms[] = { |
| 157 | 256, 68, 80, 101, 118, 137, 159, 189, 213, 230, 246, 256 |
| 158 | }; |
| 159 | |
| 160 | static const uint16_t silk_model_pitch_contour_mbwb10ms[] = { |
| 161 | 256, 91, 137, 176, 195, 209, 221, 229, 236, 242, 247, 252, 256 |
| 162 | }; |
| 163 | |
| 164 | static const uint16_t silk_model_pitch_contour_mbwb20ms[] = { |
| 165 | 256, 33, 55, 73, 89, 104, 118, 132, 145, 158, 168, 177, 186, 194, 200, 206, |
| 166 | 212, 217, 221, 225, 229, 232, 235, 238, 240, 242, 244, 246, 248, 250, 252, 253, |
| 167 | 254, 255, 256 |
| 168 | }; |
| 169 | |
| 170 | static const uint16_t silk_model_ltp_filter[] = { 256, 77, 157, 256 }; |
| 171 | |
| 172 | static const uint16_t silk_model_ltp_filter0_sel[] = { |
| 173 | 256, 185, 200, 213, 226, 235, 244, 250, 256 |
| 174 | }; |
| 175 | |
| 176 | static const uint16_t silk_model_ltp_filter1_sel[] = { |
| 177 | 256, 57, 91, 112, 132, 147, 160, 172, 185, 195, 205, 214, 224, 233, 241, 248, 256 |
| 178 | }; |
| 179 | |
| 180 | static const uint16_t silk_model_ltp_filter2_sel[] = { |
| 181 | 256, 15, 31, 45, 57, 69, 81, 92, 103, 114, 124, 133, 142, 151, 160, 168, |
| 182 | 176, 184, 192, 199, 206, 212, 218, 223, 227, 232, 236, 240, 244, 247, 251, 254, 256 |
| 183 | }; |
| 184 | |
| 185 | static const uint16_t silk_model_ltp_scale_index[] = { 256, 128, 192, 256 }; |
| 186 | |
| 187 | static const uint16_t silk_model_lcg_seed[] = { 256, 64, 128, 192, 256 }; |
| 188 | |
| 189 | static const uint16_t silk_model_exc_rate[2][10] = { |
| 190 | { 256, 15, 66, 78, 124, 169, 182, 215, 242, 256 }, // unvoiced |
| 191 | { 256, 33, 63, 99, 116, 150, 199, 217, 238, 256 } // voiced |
| 192 | }; |
| 193 | |
| 194 | static const uint16_t silk_model_pulse_count[11][19] = { |
| 195 | { 256, 131, 205, 230, 238, 241, 244, 245, 246, |
| 196 | 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
| 197 | { 256, 58, 151, 211, 234, 241, 244, 245, 246, |
| 198 | 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
| 199 | { 256, 43, 94, 140, 173, 197, 213, 224, 232, |
| 200 | 238, 241, 244, 247, 249, 250, 251, 253, 254, 256 }, |
| 201 | { 256, 17, 69, 140, 197, 228, 240, 245, 246, |
| 202 | 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, |
| 203 | { 256, 6, 27, 68, 121, 170, 205, 226, 237, |
| 204 | 243, 246, 248, 250, 251, 252, 253, 254, 255, 256 }, |
| 205 | { 256, 7, 21, 43, 71, 100, 128, 153, 173, |
| 206 | 190, 203, 214, 223, 230, 235, 239, 243, 246, 256 }, |
| 207 | { 256, 2, 7, 21, 50, 92, 138, 179, 210, |
| 208 | 229, 240, 246, 249, 251, 252, 253, 254, 255, 256 }, |
| 209 | { 256, 1, 3, 7, 17, 36, 65, 100, 137, |
| 210 | 171, 199, 219, 233, 241, 246, 250, 252, 254, 256 }, |
| 211 | { 256, 1, 3, 5, 10, 19, 33, 53, 77, |
| 212 | 104, 132, 158, 181, 201, 216, 227, 235, 241, 256 }, |
| 213 | { 256, 1, 2, 3, 9, 36, 94, 150, 189, |
| 214 | 214, 228, 238, 244, 247, 250, 252, 253, 254, 256 }, |
| 215 | { 256, 2, 3, 9, 36, 94, 150, 189, 214, |
| 216 | 228, 238, 244, 247, 250, 252, 253, 254, 256, 256 } |
| 217 | }; |
| 218 | |
| 219 | static const uint16_t silk_model_pulse_location[4][168] = { |
| 220 | { |
| 221 | 256, 126, 256, |
| 222 | 256, 56, 198, 256, |
| 223 | 256, 25, 126, 230, 256, |
| 224 | 256, 12, 72, 180, 244, 256, |
| 225 | 256, 7, 42, 126, 213, 250, 256, |
| 226 | 256, 4, 24, 83, 169, 232, 253, 256, |
| 227 | 256, 3, 15, 53, 125, 200, 242, 254, 256, |
| 228 | 256, 2, 10, 35, 89, 162, 221, 248, 255, 256, |
| 229 | 256, 2, 7, 24, 63, 126, 191, 233, 251, 255, 256, |
| 230 | 256, 1, 5, 17, 45, 94, 157, 211, 241, 252, 255, 256, |
| 231 | 256, 1, 5, 13, 33, 70, 125, 182, 223, 245, 253, 255, 256, |
| 232 | 256, 1, 4, 11, 26, 54, 98, 151, 199, 232, 248, 254, 255, 256, |
| 233 | 256, 1, 3, 9, 21, 42, 77, 124, 172, 212, 237, 249, 254, 255, 256, |
| 234 | 256, 1, 2, 6, 16, 33, 60, 97, 144, 187, 220, 241, 250, 254, 255, 256, |
| 235 | 256, 1, 2, 3, 11, 25, 47, 80, 120, 163, 201, 229, 245, 253, 254, 255, 256, |
| 236 | 256, 1, 2, 3, 4, 17, 35, 62, 98, 139, 180, 214, 238, 252, 253, 254, 255, 256 |
| 237 | },{ |
| 238 | 256, 127, 256, |
| 239 | 256, 53, 202, 256, |
| 240 | 256, 22, 127, 233, 256, |
| 241 | 256, 11, 72, 183, 246, 256, |
| 242 | 256, 6, 41, 127, 215, 251, 256, |
| 243 | 256, 4, 24, 83, 170, 232, 253, 256, |
| 244 | 256, 3, 16, 56, 127, 200, 241, 254, 256, |
| 245 | 256, 3, 12, 39, 92, 162, 218, 246, 255, 256, |
| 246 | 256, 3, 11, 30, 67, 124, 185, 229, 249, 255, 256, |
| 247 | 256, 3, 10, 25, 53, 97, 151, 200, 233, 250, 255, 256, |
| 248 | 256, 1, 8, 21, 43, 77, 123, 171, 209, 237, 251, 255, 256, |
| 249 | 256, 1, 2, 13, 35, 62, 97, 139, 186, 219, 244, 254, 255, 256, |
| 250 | 256, 1, 2, 8, 22, 48, 85, 128, 171, 208, 234, 248, 254, 255, 256, |
| 251 | 256, 1, 2, 6, 16, 36, 67, 107, 149, 189, 220, 240, 250, 254, 255, 256, |
| 252 | 256, 1, 2, 5, 13, 29, 55, 90, 128, 166, 201, 227, 243, 251, 254, 255, 256, |
| 253 | 256, 1, 2, 4, 10, 22, 43, 73, 109, 147, 183, 213, 234, 246, 252, 254, 255, 256 |
| 254 | },{ |
| 255 | 256, 127, 256, |
| 256 | 256, 49, 206, 256, |
| 257 | 256, 20, 127, 236, 256, |
| 258 | 256, 11, 71, 184, 246, 256, |
| 259 | 256, 7, 43, 127, 214, 250, 256, |
| 260 | 256, 6, 30, 87, 169, 229, 252, 256, |
| 261 | 256, 5, 23, 62, 126, 194, 236, 252, 256, |
| 262 | 256, 6, 20, 49, 96, 157, 209, 239, 253, 256, |
| 263 | 256, 1, 16, 39, 74, 125, 175, 215, 245, 255, 256, |
| 264 | 256, 1, 2, 23, 55, 97, 149, 195, 236, 254, 255, 256, |
| 265 | 256, 1, 7, 23, 50, 86, 128, 170, 206, 233, 249, 255, 256, |
| 266 | 256, 1, 6, 18, 39, 70, 108, 148, 186, 217, 238, 250, 255, 256, |
| 267 | 256, 1, 4, 13, 30, 56, 90, 128, 166, 200, 226, 243, 252, 255, 256, |
| 268 | 256, 1, 4, 11, 25, 47, 76, 110, 146, 180, 209, 231, 245, 252, 255, 256, |
| 269 | 256, 1, 3, 8, 19, 37, 62, 93, 128, 163, 194, 219, 237, 248, 253, 255, 256, |
| 270 | 256, 1, 2, 6, 15, 30, 51, 79, 111, 145, 177, 205, 226, 241, 250, 254, 255, 256 |
| 271 | },{ |
| 272 | 256, 128, 256, |
| 273 | 256, 42, 214, 256, |
| 274 | 256, 21, 128, 235, 256, |
| 275 | 256, 12, 72, 184, 245, 256, |
| 276 | 256, 8, 42, 128, 214, 249, 256, |
| 277 | 256, 8, 31, 86, 176, 231, 251, 256, |
| 278 | 256, 5, 20, 58, 130, 202, 238, 253, 256, |
| 279 | 256, 6, 18, 45, 97, 174, 221, 241, 251, 256, |
| 280 | 256, 6, 25, 53, 88, 128, 168, 203, 231, 250, 256, |
| 281 | 256, 4, 18, 40, 71, 108, 148, 185, 216, 238, 252, 256, |
| 282 | 256, 3, 13, 31, 57, 90, 128, 166, 199, 225, 243, 253, 256, |
| 283 | 256, 2, 10, 23, 44, 73, 109, 147, 183, 212, 233, 246, 254, 256, |
| 284 | 256, 1, 6, 16, 33, 58, 90, 128, 166, 198, 223, 240, 250, 255, 256, |
| 285 | 256, 1, 5, 12, 25, 46, 75, 110, 146, 181, 210, 231, 244, 251, 255, 256, |
| 286 | 256, 1, 3, 8, 18, 35, 60, 92, 128, 164, 196, 221, 238, 248, 253, 255, 256, |
| 287 | 256, 1, 3, 7, 14, 27, 48, 76, 110, 146, 180, 208, 229, 242, 249, 253, 255, 256 |
| 288 | } |
| 289 | }; |
| 290 | |
| 291 | static const uint16_t silk_model_excitation_lsb[] = {256, 136, 256}; |
| 292 | |
| 293 | static const uint16_t silk_model_excitation_sign[3][2][7][3] = { |
| 294 | { // Inactive |
| 295 | { // Low offset |
| 296 | {256, 2, 256}, |
| 297 | {256, 207, 256}, |
| 298 | {256, 189, 256}, |
| 299 | {256, 179, 256}, |
| 300 | {256, 174, 256}, |
| 301 | {256, 163, 256}, |
| 302 | {256, 157, 256} |
| 303 | }, { // High offset |
| 304 | {256, 58, 256}, |
| 305 | {256, 245, 256}, |
| 306 | {256, 238, 256}, |
| 307 | {256, 232, 256}, |
| 308 | {256, 225, 256}, |
| 309 | {256, 220, 256}, |
| 310 | {256, 211, 256} |
| 311 | } |
| 312 | }, { // Unvoiced |
| 313 | { // Low offset |
| 314 | {256, 1, 256}, |
| 315 | {256, 210, 256}, |
| 316 | {256, 190, 256}, |
| 317 | {256, 178, 256}, |
| 318 | {256, 169, 256}, |
| 319 | {256, 162, 256}, |
| 320 | {256, 152, 256} |
| 321 | }, { // High offset |
| 322 | {256, 48, 256}, |
| 323 | {256, 242, 256}, |
| 324 | {256, 235, 256}, |
| 325 | {256, 224, 256}, |
| 326 | {256, 214, 256}, |
| 327 | {256, 205, 256}, |
| 328 | {256, 190, 256} |
| 329 | } |
| 330 | }, { // Voiced |
| 331 | { // Low offset |
| 332 | {256, 1, 256}, |
| 333 | {256, 162, 256}, |
| 334 | {256, 152, 256}, |
| 335 | {256, 147, 256}, |
| 336 | {256, 144, 256}, |
| 337 | {256, 141, 256}, |
| 338 | {256, 138, 256} |
| 339 | }, { // High offset |
| 340 | {256, 8, 256}, |
| 341 | {256, 203, 256}, |
| 342 | {256, 187, 256}, |
| 343 | {256, 176, 256}, |
| 344 | {256, 168, 256}, |
| 345 | {256, 161, 256}, |
| 346 | {256, 154, 256} |
| 347 | } |
| 348 | } |
| 349 | }; |
| 350 | |
| 351 | static const int16_t silk_stereo_weights[] = { |
| 352 | -13732, -10050, -8266, -7526, -6500, -5000, -2950, -820, |
| 353 | 820, 2950, 5000, 6500, 7526, 8266, 10050, 13732 |
| 354 | }; |
| 355 | |
| 356 | static const uint8_t silk_lsf_s2_model_sel_nbmb[32][10] = { |
| 357 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 358 | { 1, 3, 1, 2, 2, 1, 2, 1, 1, 1 }, |
| 359 | { 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, |
| 360 | { 1, 2, 2, 2, 2, 1, 2, 1, 1, 1 }, |
| 361 | { 2, 3, 3, 3, 3, 2, 2, 2, 2, 2 }, |
| 362 | { 0, 5, 3, 3, 2, 2, 2, 2, 1, 1 }, |
| 363 | { 0, 2, 2, 2, 2, 2, 2, 2, 2, 1 }, |
| 364 | { 2, 3, 6, 4, 4, 4, 5, 4, 5, 5 }, |
| 365 | { 2, 4, 5, 5, 4, 5, 4, 6, 4, 4 }, |
| 366 | { 2, 4, 4, 7, 4, 5, 4, 5, 5, 4 }, |
| 367 | { 4, 3, 3, 3, 2, 3, 2, 2, 2, 2 }, |
| 368 | { 1, 5, 5, 6, 4, 5, 4, 5, 5, 5 }, |
| 369 | { 2, 7, 4, 6, 5, 5, 5, 5, 5, 5 }, |
| 370 | { 2, 7, 5, 5, 5, 5, 5, 6, 5, 4 }, |
| 371 | { 3, 3, 5, 4, 4, 5, 4, 5, 4, 4 }, |
| 372 | { 2, 3, 3, 5, 5, 4, 4, 4, 4, 4 }, |
| 373 | { 2, 4, 4, 6, 4, 5, 4, 5, 5, 5 }, |
| 374 | { 2, 5, 4, 6, 5, 5, 5, 4, 5, 4 }, |
| 375 | { 2, 7, 4, 5, 4, 5, 4, 5, 5, 5 }, |
| 376 | { 2, 5, 4, 6, 7, 6, 5, 6, 5, 4 }, |
| 377 | { 3, 6, 7, 4, 6, 5, 5, 6, 4, 5 }, |
| 378 | { 2, 7, 6, 4, 4, 4, 5, 4, 5, 5 }, |
| 379 | { 4, 5, 5, 4, 6, 6, 5, 6, 5, 4 }, |
| 380 | { 2, 5, 5, 6, 5, 6, 4, 6, 4, 4 }, |
| 381 | { 4, 5, 5, 5, 3, 7, 4, 5, 5, 4 }, |
| 382 | { 2, 3, 4, 5, 5, 6, 4, 5, 5, 4 }, |
| 383 | { 2, 3, 2, 3, 3, 4, 2, 3, 3, 3 }, |
| 384 | { 1, 1, 2, 2, 2, 2, 2, 3, 2, 2 }, |
| 385 | { 4, 5, 5, 6, 6, 6, 5, 6, 4, 5 }, |
| 386 | { 3, 5, 5, 4, 4, 4, 4, 3, 3, 2 }, |
| 387 | { 2, 5, 3, 7, 5, 5, 4, 4, 5, 4 }, |
| 388 | { 4, 4, 5, 4, 5, 6, 5, 6, 5, 4 } |
| 389 | }; |
| 390 | |
| 391 | static const uint8_t silk_lsf_s2_model_sel_wb[32][16] = { |
| 392 | { 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
| 393 | { 10, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 8, 11 }, |
| 394 | { 10, 13, 13, 11, 15, 12, 12, 13, 10, 13, 12, 13, 13, 12, 11, 11 }, |
| 395 | { 8, 10, 9, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 9 }, |
| 396 | { 8, 14, 13, 12, 14, 12, 15, 13, 12, 12, 12, 13, 13, 12, 12, 11 }, |
| 397 | { 8, 11, 13, 13, 12, 11, 11, 13, 11, 11, 11, 11, 11, 11, 10, 12 }, |
| 398 | { 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
| 399 | { 8, 10, 14, 11, 15, 10, 13, 11, 12, 13, 13, 12, 11, 11, 10, 11 }, |
| 400 | { 8, 14, 10, 14, 14, 12, 13, 12, 14, 13, 12, 12, 13, 11, 11, 11 }, |
| 401 | { 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
| 402 | { 8, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9 }, |
| 403 | { 10, 10, 11, 12, 13, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 11 }, |
| 404 | { 10, 10, 11, 11, 12, 11, 11, 11, 11, 11, 11, 11, 11, 10, 9, 11 }, |
| 405 | { 11, 12, 12, 12, 14, 12, 12, 13, 11, 13, 12, 12, 13, 12, 11, 12 }, |
| 406 | { 8, 14, 12, 13, 12, 15, 13, 10, 14, 13, 15, 12, 12, 11, 13, 11 }, |
| 407 | { 8, 9, 8, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 9, 8 }, |
| 408 | { 9, 14, 13, 15, 13, 12, 13, 11, 12, 13, 12, 12, 12, 11, 11, 12 }, |
| 409 | { 9, 11, 11, 12, 12, 11, 11, 13, 10, 11, 11, 13, 13, 13, 11, 12 }, |
| 410 | { 10, 11, 11, 10, 10, 10, 11, 10, 9, 10, 9, 10, 9, 9, 9, 12 }, |
| 411 | { 8, 10, 11, 13, 11, 11, 10, 10, 10, 9, 9, 8, 8, 8, 8, 8 }, |
| 412 | { 11, 12, 11, 13, 11, 11, 10, 10, 9, 9, 9, 9, 9, 10, 10, 12 }, |
| 413 | { 10, 14, 11, 15, 15, 12, 13, 12, 13, 11, 13, 11, 11, 10, 11, 11 }, |
| 414 | { 10, 11, 13, 14, 14, 11, 13, 11, 12, 12, 11, 11, 11, 11, 10, 12 }, |
| 415 | { 9, 11, 11, 12, 12, 12, 12, 11, 13, 13, 13, 11, 9, 9, 9, 9 }, |
| 416 | { 10, 13, 11, 14, 14, 12, 15, 12, 12, 13, 11, 12, 12, 11, 11, 11 }, |
| 417 | { 8, 14, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, |
| 418 | { 8, 14, 14, 11, 13, 10, 13, 13, 11, 12, 12, 15, 15, 12, 12, 12 }, |
| 419 | { 11, 11, 15, 11, 13, 12, 11, 11, 11, 10, 10, 11, 11, 11, 10, 11 }, |
| 420 | { 8, 8, 9, 8, 8, 8, 10, 9, 10, 9, 9, 10, 10, 10, 9, 9 }, |
| 421 | { 8, 11, 10, 13, 11, 11, 10, 11, 10, 9, 8, 8, 9, 8, 8, 9 }, |
| 422 | { 11, 13, 13, 12, 15, 13, 11, 11, 10, 11, 10, 10, 9, 8, 9, 8 }, |
| 423 | { 10, 11, 13, 11, 12, 11, 11, 11, 10, 9, 10, 14, 12, 8, 8, 8 } |
| 424 | }; |
| 425 | |
| 426 | static const uint8_t silk_lsf_pred_weights_nbmb[2][9] = { |
| 427 | {179, 138, 140, 148, 151, 149, 153, 151, 163}, |
| 428 | {116, 67, 82, 59, 92, 72, 100, 89, 92} |
| 429 | }; |
| 430 | |
| 431 | static const uint8_t silk_lsf_pred_weights_wb[2][15] = { |
| 432 | {175, 148, 160, 176, 178, 173, 174, 164, 177, 174, 196, 182, 198, 192, 182}, |
| 433 | { 68, 62, 66, 60, 72, 117, 85, 90, 118, 136, 151, 142, 160, 142, 155} |
| 434 | }; |
| 435 | |
| 436 | static const uint8_t silk_lsf_weight_sel_nbmb[32][9] = { |
| 437 | { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, |
| 438 | { 1, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 439 | { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 440 | { 1, 1, 1, 0, 0, 0, 0, 1, 0 }, |
| 441 | { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, |
| 442 | { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, |
| 443 | { 1, 0, 1, 1, 0, 0, 0, 1, 0 }, |
| 444 | { 0, 1, 1, 0, 0, 1, 1, 0, 0 }, |
| 445 | { 0, 0, 1, 1, 0, 1, 0, 1, 1 }, |
| 446 | { 0, 0, 1, 1, 0, 0, 1, 1, 1 }, |
| 447 | { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 448 | { 0, 1, 0, 1, 1, 1, 1, 1, 0 }, |
| 449 | { 0, 1, 0, 1, 1, 1, 1, 1, 0 }, |
| 450 | { 0, 1, 1, 1, 1, 1, 1, 1, 0 }, |
| 451 | { 1, 0, 1, 1, 0, 1, 1, 1, 1 }, |
| 452 | { 0, 1, 1, 1, 1, 1, 0, 1, 0 }, |
| 453 | { 0, 0, 1, 1, 0, 1, 0, 1, 0 }, |
| 454 | { 0, 0, 1, 1, 1, 0, 1, 1, 1 }, |
| 455 | { 0, 1, 1, 0, 0, 1, 1, 1, 0 }, |
| 456 | { 0, 0, 0, 1, 1, 1, 0, 1, 0 }, |
| 457 | { 0, 1, 1, 0, 0, 1, 0, 1, 0 }, |
| 458 | { 0, 1, 1, 0, 0, 0, 1, 1, 0 }, |
| 459 | { 0, 0, 0, 0, 0, 1, 1, 1, 1 }, |
| 460 | { 0, 0, 1, 1, 0, 0, 0, 1, 1 }, |
| 461 | { 0, 0, 0, 1, 0, 1, 1, 1, 1 }, |
| 462 | { 0, 1, 1, 1, 1, 1, 1, 1, 0 }, |
| 463 | { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 464 | { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 465 | { 0, 0, 1, 0, 1, 1, 0, 1, 0 }, |
| 466 | { 1, 0, 0, 1, 0, 0, 0, 0, 0 }, |
| 467 | { 0, 0, 0, 1, 1, 0, 1, 0, 1 }, |
| 468 | { 1, 0, 1, 1, 0, 1, 1, 1, 1 } |
| 469 | }; |
| 470 | |
| 471 | static const uint8_t silk_lsf_weight_sel_wb[32][15] = { |
| 472 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
| 473 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 474 | { 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0 }, |
| 475 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, |
| 476 | { 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0 }, |
| 477 | { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 478 | { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0 }, |
| 479 | { 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1 }, |
| 480 | { 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1 }, |
| 481 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
| 482 | { 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 483 | { 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0 }, |
| 484 | { 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0 }, |
| 485 | { 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0 }, |
| 486 | { 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1 }, |
| 487 | { 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 }, |
| 488 | { 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0 }, |
| 489 | { 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0 }, |
| 490 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
| 491 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, |
| 492 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 493 | { 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0 }, |
| 494 | { 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0 }, |
| 495 | { 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0 }, |
| 496 | { 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1 }, |
| 497 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
| 498 | { 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1 }, |
| 499 | { 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1 }, |
| 500 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
| 501 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, |
| 502 | { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 }, |
| 503 | { 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 } |
| 504 | }; |
| 505 | |
| 506 | static const uint8_t silk_lsf_codebook_nbmb[32][10] = { |
| 507 | { 12, 35, 60, 83, 108, 132, 157, 180, 206, 228 }, |
| 508 | { 15, 32, 55, 77, 101, 125, 151, 175, 201, 225 }, |
| 509 | { 19, 42, 66, 89, 114, 137, 162, 184, 209, 230 }, |
| 510 | { 12, 25, 50, 72, 97, 120, 147, 172, 200, 223 }, |
| 511 | { 26, 44, 69, 90, 114, 135, 159, 180, 205, 225 }, |
| 512 | { 13, 22, 53, 80, 106, 130, 156, 180, 205, 228 }, |
| 513 | { 15, 25, 44, 64, 90, 115, 142, 168, 196, 222 }, |
| 514 | { 19, 24, 62, 82, 100, 120, 145, 168, 190, 214 }, |
| 515 | { 22, 31, 50, 79, 103, 120, 151, 170, 203, 227 }, |
| 516 | { 21, 29, 45, 65, 106, 124, 150, 171, 196, 224 }, |
| 517 | { 30, 49, 75, 97, 121, 142, 165, 186, 209, 229 }, |
| 518 | { 19, 25, 52, 70, 93, 116, 143, 166, 192, 219 }, |
| 519 | { 26, 34, 62, 75, 97, 118, 145, 167, 194, 217 }, |
| 520 | { 25, 33, 56, 70, 91, 113, 143, 165, 196, 223 }, |
| 521 | { 21, 34, 51, 72, 97, 117, 145, 171, 196, 222 }, |
| 522 | { 20, 29, 50, 67, 90, 117, 144, 168, 197, 221 }, |
| 523 | { 22, 31, 48, 66, 95, 117, 146, 168, 196, 222 }, |
| 524 | { 24, 33, 51, 77, 116, 134, 158, 180, 200, 224 }, |
| 525 | { 21, 28, 70, 87, 106, 124, 149, 170, 194, 217 }, |
| 526 | { 26, 33, 53, 64, 83, 117, 152, 173, 204, 225 }, |
| 527 | { 27, 34, 65, 95, 108, 129, 155, 174, 210, 225 }, |
| 528 | { 20, 26, 72, 99, 113, 131, 154, 176, 200, 219 }, |
| 529 | { 34, 43, 61, 78, 93, 114, 155, 177, 205, 229 }, |
| 530 | { 23, 29, 54, 97, 124, 138, 163, 179, 209, 229 }, |
| 531 | { 30, 38, 56, 89, 118, 129, 158, 178, 200, 231 }, |
| 532 | { 21, 29, 49, 63, 85, 111, 142, 163, 193, 222 }, |
| 533 | { 27, 48, 77, 103, 133, 158, 179, 196, 215, 232 }, |
| 534 | { 29, 47, 74, 99, 124, 151, 176, 198, 220, 237 }, |
| 535 | { 33, 42, 61, 76, 93, 121, 155, 174, 207, 225 }, |
| 536 | { 29, 53, 87, 112, 136, 154, 170, 188, 208, 227 }, |
| 537 | { 24, 30, 52, 84, 131, 150, 166, 186, 203, 229 }, |
| 538 | { 37, 48, 64, 84, 104, 118, 156, 177, 201, 230 } |
| 539 | }; |
| 540 | |
| 541 | static const uint8_t silk_lsf_codebook_wb[32][16] = { |
| 542 | { 7, 23, 38, 54, 69, 85, 100, 116, 131, 147, 162, 178, 193, 208, 223, 239 }, |
| 543 | { 13, 25, 41, 55, 69, 83, 98, 112, 127, 142, 157, 171, 187, 203, 220, 236 }, |
| 544 | { 15, 21, 34, 51, 61, 78, 92, 106, 126, 136, 152, 167, 185, 205, 225, 240 }, |
| 545 | { 10, 21, 36, 50, 63, 79, 95, 110, 126, 141, 157, 173, 189, 205, 221, 237 }, |
| 546 | { 17, 20, 37, 51, 59, 78, 89, 107, 123, 134, 150, 164, 184, 205, 224, 240 }, |
| 547 | { 10, 15, 32, 51, 67, 81, 96, 112, 129, 142, 158, 173, 189, 204, 220, 236 }, |
| 548 | { 8, 21, 37, 51, 65, 79, 98, 113, 126, 138, 155, 168, 179, 192, 209, 218 }, |
| 549 | { 12, 15, 34, 55, 63, 78, 87, 108, 118, 131, 148, 167, 185, 203, 219, 236 }, |
| 550 | { 16, 19, 32, 36, 56, 79, 91, 108, 118, 136, 154, 171, 186, 204, 220, 237 }, |
| 551 | { 11, 28, 43, 58, 74, 89, 105, 120, 135, 150, 165, 180, 196, 211, 226, 241 }, |
| 552 | { 6, 16, 33, 46, 60, 75, 92, 107, 123, 137, 156, 169, 185, 199, 214, 225 }, |
| 553 | { 11, 19, 30, 44, 57, 74, 89, 105, 121, 135, 152, 169, 186, 202, 218, 234 }, |
| 554 | { 12, 19, 29, 46, 57, 71, 88, 100, 120, 132, 148, 165, 182, 199, 216, 233 }, |
| 555 | { 17, 23, 35, 46, 56, 77, 92, 106, 123, 134, 152, 167, 185, 204, 222, 237 }, |
| 556 | { 14, 17, 45, 53, 63, 75, 89, 107, 115, 132, 151, 171, 188, 206, 221, 240 }, |
| 557 | { 9, 16, 29, 40, 56, 71, 88, 103, 119, 137, 154, 171, 189, 205, 222, 237 }, |
| 558 | { 16, 19, 36, 48, 57, 76, 87, 105, 118, 132, 150, 167, 185, 202, 218, 236 }, |
| 559 | { 12, 17, 29, 54, 71, 81, 94, 104, 126, 136, 149, 164, 182, 201, 221, 237 }, |
| 560 | { 15, 28, 47, 62, 79, 97, 115, 129, 142, 155, 168, 180, 194, 208, 223, 238 }, |
| 561 | { 8, 14, 30, 45, 62, 78, 94, 111, 127, 143, 159, 175, 192, 207, 223, 239 }, |
| 562 | { 17, 30, 49, 62, 79, 92, 107, 119, 132, 145, 160, 174, 190, 204, 220, 235 }, |
| 563 | { 14, 19, 36, 45, 61, 76, 91, 108, 121, 138, 154, 172, 189, 205, 222, 238 }, |
| 564 | { 12, 18, 31, 45, 60, 76, 91, 107, 123, 138, 154, 171, 187, 204, 221, 236 }, |
| 565 | { 13, 17, 31, 43, 53, 70, 83, 103, 114, 131, 149, 167, 185, 203, 220, 237 }, |
| 566 | { 17, 22, 35, 42, 58, 78, 93, 110, 125, 139, 155, 170, 188, 206, 224, 240 }, |
| 567 | { 8, 15, 34, 50, 67, 83, 99, 115, 131, 146, 162, 178, 193, 209, 224, 239 }, |
| 568 | { 13, 16, 41, 66, 73, 86, 95, 111, 128, 137, 150, 163, 183, 206, 225, 241 }, |
| 569 | { 17, 25, 37, 52, 63, 75, 92, 102, 119, 132, 144, 160, 175, 191, 212, 231 }, |
| 570 | { 19, 31, 49, 65, 83, 100, 117, 133, 147, 161, 174, 187, 200, 213, 227, 242 }, |
| 571 | { 18, 31, 52, 68, 88, 103, 117, 126, 138, 149, 163, 177, 192, 207, 223, 239 }, |
| 572 | { 16, 29, 47, 61, 76, 90, 106, 119, 133, 147, 161, 176, 193, 209, 224, 240 }, |
| 573 | { 15, 21, 35, 50, 61, 73, 86, 97, 110, 119, 129, 141, 175, 198, 218, 237 } |
| 574 | }; |
| 575 | |
| 576 | static const uint16_t silk_lsf_min_spacing_nbmb[] = { |
| 577 | 250, 3, 6, 3, 3, 3, 4, 3, 3, 3, 461 |
| 578 | }; |
| 579 | |
| 580 | static const uint16_t silk_lsf_min_spacing_wb[] = { |
| 581 | 100, 3, 40, 3, 3, 3, 5, 14, 14, 10, 11, 3, 8, 9, 7, 3, 347 |
| 582 | }; |
| 583 | |
| 584 | static const uint8_t silk_lsf_ordering_nbmb[] = { |
| 585 | 0, 9, 6, 3, 4, 5, 8, 1, 2, 7 |
| 586 | }; |
| 587 | |
| 588 | static const uint8_t silk_lsf_ordering_wb[] = { |
| 589 | 0, 15, 8, 7, 4, 11, 12, 3, 2, 13, 10, 5, 6, 9, 14, 1 |
| 590 | }; |
| 591 | |
| 592 | static const int16_t silk_cosine[] = { /* (0.12) */ |
| 593 | 4096, 4095, 4091, 4085, |
| 594 | 4076, 4065, 4052, 4036, |
| 595 | 4017, 3997, 3973, 3948, |
| 596 | 3920, 3889, 3857, 3822, |
| 597 | 3784, 3745, 3703, 3659, |
| 598 | 3613, 3564, 3513, 3461, |
| 599 | 3406, 3349, 3290, 3229, |
| 600 | 3166, 3102, 3035, 2967, |
| 601 | 2896, 2824, 2751, 2676, |
| 602 | 2599, 2520, 2440, 2359, |
| 603 | 2276, 2191, 2106, 2019, |
| 604 | 1931, 1842, 1751, 1660, |
| 605 | 1568, 1474, 1380, 1285, |
| 606 | 1189, 1093, 995, 897, |
| 607 | 799, 700, 601, 501, |
| 608 | 401, 301, 201, 101, |
| 609 | 0, -101, -201, -301, |
| 610 | -401, -501, -601, -700, |
| 611 | -799, -897, -995, -1093, |
| 612 | -1189, -1285, -1380, -1474, |
| 613 | -1568, -1660, -1751, -1842, |
| 614 | -1931, -2019, -2106, -2191, |
| 615 | -2276, -2359, -2440, -2520, |
| 616 | -2599, -2676, -2751, -2824, |
| 617 | -2896, -2967, -3035, -3102, |
| 618 | -3166, -3229, -3290, -3349, |
| 619 | -3406, -3461, -3513, -3564, |
| 620 | -3613, -3659, -3703, -3745, |
| 621 | -3784, -3822, -3857, -3889, |
| 622 | -3920, -3948, -3973, -3997, |
| 623 | -4017, -4036, -4052, -4065, |
| 624 | -4076, -4085, -4091, -4095, |
| 625 | -4096 |
| 626 | }; |
| 627 | |
| 628 | static const uint16_t silk_pitch_scale[] = { 4, 6, 8}; |
| 629 | |
| 630 | static const uint16_t silk_pitch_min_lag[] = { 16, 24, 32}; |
| 631 | |
| 632 | static const uint16_t silk_pitch_max_lag[] = {144, 216, 288}; |
| 633 | |
| 634 | static const int8_t silk_pitch_offset_nb10ms[3][2] = { |
| 635 | { 0, 0}, |
| 636 | { 1, 0}, |
| 637 | { 0, 1} |
| 638 | }; |
| 639 | |
| 640 | static const int8_t silk_pitch_offset_nb20ms[11][4] = { |
| 641 | { 0, 0, 0, 0}, |
| 642 | { 2, 1, 0, -1}, |
| 643 | {-1, 0, 1, 2}, |
| 644 | {-1, 0, 0, 1}, |
| 645 | {-1, 0, 0, 0}, |
| 646 | { 0, 0, 0, 1}, |
| 647 | { 0, 0, 1, 1}, |
| 648 | { 1, 1, 0, 0}, |
| 649 | { 1, 0, 0, 0}, |
| 650 | { 0, 0, 0, -1}, |
| 651 | { 1, 0, 0, -1} |
| 652 | }; |
| 653 | |
| 654 | static const int8_t silk_pitch_offset_mbwb10ms[12][2] = { |
| 655 | { 0, 0}, |
| 656 | { 0, 1}, |
| 657 | { 1, 0}, |
| 658 | {-1, 1}, |
| 659 | { 1, -1}, |
| 660 | {-1, 2}, |
| 661 | { 2, -1}, |
| 662 | {-2, 2}, |
| 663 | { 2, -2}, |
| 664 | {-2, 3}, |
| 665 | { 3, -2}, |
| 666 | {-3, 3} |
| 667 | }; |
| 668 | |
| 669 | static const int8_t silk_pitch_offset_mbwb20ms[34][4] = { |
| 670 | { 0, 0, 0, 0}, |
| 671 | { 0, 0, 1, 1}, |
| 672 | { 1, 1, 0, 0}, |
| 673 | {-1, 0, 0, 0}, |
| 674 | { 0, 0, 0, 1}, |
| 675 | { 1, 0, 0, 0}, |
| 676 | {-1, 0, 0, 1}, |
| 677 | { 0, 0, 0, -1}, |
| 678 | {-1, 0, 1, 2}, |
| 679 | { 1, 0, 0, -1}, |
| 680 | {-2, -1, 1, 2}, |
| 681 | { 2, 1, 0, -1}, |
| 682 | {-2, 0, 0, 2}, |
| 683 | {-2, 0, 1, 3}, |
| 684 | { 2, 1, -1, -2}, |
| 685 | {-3, -1, 1, 3}, |
| 686 | { 2, 0, 0, -2}, |
| 687 | { 3, 1, 0, -2}, |
| 688 | {-3, -1, 2, 4}, |
| 689 | {-4, -1, 1, 4}, |
| 690 | { 3, 1, -1, -3}, |
| 691 | {-4, -1, 2, 5}, |
| 692 | { 4, 2, -1, -3}, |
| 693 | { 4, 1, -1, -4}, |
| 694 | {-5, -1, 2, 6}, |
| 695 | { 5, 2, -1, -4}, |
| 696 | {-6, -2, 2, 6}, |
| 697 | {-5, -2, 2, 5}, |
| 698 | { 6, 2, -1, -5}, |
| 699 | {-7, -2, 3, 8}, |
| 700 | { 6, 2, -2, -6}, |
| 701 | { 5, 2, -2, -5}, |
| 702 | { 8, 3, -2, -7}, |
| 703 | {-9, -3, 3, 9} |
| 704 | }; |
| 705 | |
| 706 | static const int8_t silk_ltp_filter0_taps[8][5] = { |
| 707 | { 4, 6, 24, 7, 5}, |
| 708 | { 0, 0, 2, 0, 0}, |
| 709 | { 12, 28, 41, 13, -4}, |
| 710 | { -9, 15, 42, 25, 14}, |
| 711 | { 1, -2, 62, 41, -9}, |
| 712 | {-10, 37, 65, -4, 3}, |
| 713 | { -6, 4, 66, 7, -8}, |
| 714 | { 16, 14, 38, -3, 33} |
| 715 | }; |
| 716 | |
| 717 | static const int8_t silk_ltp_filter1_taps[16][5] = { |
| 718 | { 13, 22, 39, 23, 12}, |
| 719 | { -1, 36, 64, 27, -6}, |
| 720 | { -7, 10, 55, 43, 17}, |
| 721 | { 1, 1, 8, 1, 1}, |
| 722 | { 6, -11, 74, 53, -9}, |
| 723 | {-12, 55, 76, -12, 8}, |
| 724 | { -3, 3, 93, 27, -4}, |
| 725 | { 26, 39, 59, 3, -8}, |
| 726 | { 2, 0, 77, 11, 9}, |
| 727 | { -8, 22, 44, -6, 7}, |
| 728 | { 40, 9, 26, 3, 9}, |
| 729 | { -7, 20, 101, -7, 4}, |
| 730 | { 3, -8, 42, 26, 0}, |
| 731 | {-15, 33, 68, 2, 23}, |
| 732 | { -2, 55, 46, -2, 15}, |
| 733 | { 3, -1, 21, 16, 41} |
| 734 | }; |
| 735 | |
| 736 | static const int8_t silk_ltp_filter2_taps[32][5] = { |
| 737 | { -6, 27, 61, 39, 5}, |
| 738 | {-11, 42, 88, 4, 1}, |
| 739 | { -2, 60, 65, 6, -4}, |
| 740 | { -1, -5, 73, 56, 1}, |
| 741 | { -9, 19, 94, 29, -9}, |
| 742 | { 0, 12, 99, 6, 4}, |
| 743 | { 8, -19, 102, 46, -13}, |
| 744 | { 3, 2, 13, 3, 2}, |
| 745 | { 9, -21, 84, 72, -18}, |
| 746 | {-11, 46, 104, -22, 8}, |
| 747 | { 18, 38, 48, 23, 0}, |
| 748 | {-16, 70, 83, -21, 11}, |
| 749 | { 5, -11, 117, 22, -8}, |
| 750 | { -6, 23, 117, -12, 3}, |
| 751 | { 3, -8, 95, 28, 4}, |
| 752 | {-10, 15, 77, 60, -15}, |
| 753 | { -1, 4, 124, 2, -4}, |
| 754 | { 3, 38, 84, 24, -25}, |
| 755 | { 2, 13, 42, 13, 31}, |
| 756 | { 21, -4, 56, 46, -1}, |
| 757 | { -1, 35, 79, -13, 19}, |
| 758 | { -7, 65, 88, -9, -14}, |
| 759 | { 20, 4, 81, 49, -29}, |
| 760 | { 20, 0, 75, 3, -17}, |
| 761 | { 5, -9, 44, 92, -8}, |
| 762 | { 1, -3, 22, 69, 31}, |
| 763 | { -6, 95, 41, -12, 5}, |
| 764 | { 39, 67, 16, -4, 1}, |
| 765 | { 0, -6, 120, 55, -36}, |
| 766 | {-13, 44, 122, 4, -24}, |
| 767 | { 81, 5, 11, 3, 7}, |
| 768 | { 2, 0, 9, 10, 88} |
| 769 | }; |
| 770 | |
| 771 | static const uint16_t silk_ltp_scale_factor[] = {15565, 12288, 8192}; |
| 772 | |
| 773 | static const uint8_t silk_shell_blocks[3][2] = { |
| 774 | { 5, 10}, // NB |
| 775 | { 8, 15}, // MB |
| 776 | {10, 20} // WB |
| 777 | }; |
| 778 | |
| 779 | static const uint8_t silk_quant_offset[2][2] = { /* (0.23) */ |
| 780 | {25, 60}, // Inactive or Unvoiced |
| 781 | { 8, 25} // Voiced |
| 782 | }; |
| 783 | |
| 784 | static const int silk_stereo_interp_len[3] = { |
| 785 | 64, 96, 128 |
| 786 | }; |
| 787 | |
| 788 | static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17]) |
| 789 | { |
| 790 | int pass, i; |
| 791 | for (pass = 0; pass < 20; pass++) { |
| 792 | int k, min_diff = 0; |
| 793 | for (i = 0; i < order+1; i++) { |
| 794 | int low = i != 0 ? nlsf[i-1] : 0; |
| 795 | int high = i != order ? nlsf[i] : 32768; |
| 796 | int diff = (high - low) - (min_delta[i]); |
| 797 | |
| 798 | if (diff < min_diff) { |
| 799 | min_diff = diff; |
| 800 | k = i; |
| 801 | |
| 802 | if (pass == 20) |
| 803 | break; |
| 804 | } |
| 805 | } |
| 806 | if (min_diff == 0) /* no issues; stabilized */ |
| 807 | return; |
| 808 | |
| 809 | /* wiggle one or two LSFs */ |
| 810 | if (k == 0) { |
| 811 | /* repel away from lower bound */ |
| 812 | nlsf[0] = min_delta[0]; |
| 813 | } else if (k == order) { |
| 814 | /* repel away from higher bound */ |
| 815 | nlsf[order-1] = 32768 - min_delta[order]; |
| 816 | } else { |
| 817 | /* repel away from current position */ |
| 818 | int min_center = 0, max_center = 32768, center_val; |
| 819 | |
| 820 | /* lower extent */ |
| 821 | for (i = 0; i < k; i++) |
| 822 | min_center += min_delta[i]; |
| 823 | min_center += min_delta[k] >> 1; |
| 824 | |
| 825 | /* upper extent */ |
| 826 | for (i = order; i > k; i--) |
| 827 | max_center -= min_delta[k]; |
| 828 | max_center -= min_delta[k] >> 1; |
| 829 | |
| 830 | /* move apart */ |
| 831 | center_val = nlsf[k - 1] + nlsf[k]; |
| 832 | center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2 |
| 833 | center_val = FFMIN(max_center, FFMAX(min_center, center_val)); |
| 834 | |
| 835 | nlsf[k - 1] = center_val - (min_delta[k] >> 1); |
| 836 | nlsf[k] = nlsf[k - 1] + min_delta[k]; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | /* resort to the fall-back method, the standard method for LSF stabilization */ |
| 841 | |
| 842 | /* sort; as the LSFs should be nearly sorted, use insertion sort */ |
| 843 | for (i = 1; i < order; i++) { |
| 844 | int j, value = nlsf[i]; |
| 845 | for (j = i - 1; j >= 0 && nlsf[j] > value; j--) |
| 846 | nlsf[j + 1] = nlsf[j]; |
| 847 | nlsf[j + 1] = value; |
| 848 | } |
| 849 | |
| 850 | /* push forwards to increase distance */ |
| 851 | if (nlsf[0] < min_delta[0]) |
| 852 | nlsf[0] = min_delta[0]; |
| 853 | for (i = 1; i < order; i++) |
| 854 | if (nlsf[i] < nlsf[i - 1] + min_delta[i]) |
| 855 | nlsf[i] = nlsf[i - 1] + min_delta[i]; |
| 856 | |
| 857 | /* push backwards to increase distance */ |
| 858 | if (nlsf[order-1] > 32768 - min_delta[order]) |
| 859 | nlsf[order-1] = 32768 - min_delta[order]; |
| 860 | for (i = order-2; i >= 0; i--) |
| 861 | if (nlsf[i] > nlsf[i + 1] - min_delta[i+1]) |
| 862 | nlsf[i] = nlsf[i + 1] - min_delta[i+1]; |
| 863 | |
| 864 | return; |
| 865 | } |
| 866 | |
| 867 | static inline int silk_is_lpc_stable(const int16_t lpc[16], int order) |
| 868 | { |
| 869 | int k, j, DC_resp = 0; |
| 870 | int32_t lpc32[2][16]; // Q24 |
| 871 | int totalinvgain = 1 << 30; // 1.0 in Q30 |
| 872 | int32_t *row = lpc32[0], *prevrow; |
| 873 | |
| 874 | /* initialize the first row for the Levinson recursion */ |
| 875 | for (k = 0; k < order; k++) { |
| 876 | DC_resp += lpc[k]; |
| 877 | row[k] = lpc[k] * 4096; |
| 878 | } |
| 879 | |
| 880 | if (DC_resp >= 4096) |
| 881 | return 0; |
| 882 | |
| 883 | /* check if prediction gain pushes any coefficients too far */ |
| 884 | for (k = order - 1; 1; k--) { |
| 885 | int rc; // Q31; reflection coefficient |
| 886 | int gaindiv; // Q30; inverse of the gain (the divisor) |
| 887 | int gain; // gain for this reflection coefficient |
| 888 | int fbits; // fractional bits used for the gain |
| 889 | int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv |
| 890 | |
| 891 | if (FFABS(row[k]) > 16773022) |
| 892 | return 0; |
| 893 | |
| 894 | rc = -(row[k] * 128); |
| 895 | gaindiv = (1 << 30) - MULH(rc, rc); |
| 896 | |
| 897 | totalinvgain = MULH(totalinvgain, gaindiv) << 2; |
| 898 | if (k == 0) |
| 899 | return (totalinvgain >= 107374); |
| 900 | |
| 901 | /* approximate 1.0/gaindiv */ |
| 902 | fbits = opus_ilog(gaindiv); |
| 903 | gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q<fbits-16> |
| 904 | error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16); |
| 905 | gain = ((gain << 16) + (error * gain >> 13)); |
| 906 | |
| 907 | /* switch to the next row of the LPC coefficients */ |
| 908 | prevrow = row; |
| 909 | row = lpc32[k & 1]; |
| 910 | |
| 911 | for (j = 0; j < k; j++) { |
| 912 | int x = prevrow[j] - ROUND_MULL(prevrow[k - j - 1], rc, 31); |
| 913 | row[j] = ROUND_MULL(x, gain, fbits); |
| 914 | } |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | static void silk_lsp2poly(const int32_t lsp[16], int32_t pol[16], int half_order) |
| 919 | { |
| 920 | int i, j; |
| 921 | |
| 922 | pol[0] = 65536; // 1.0 in Q16 |
| 923 | pol[1] = -lsp[0]; |
| 924 | |
| 925 | for (i = 1; i < half_order; i++) { |
| 926 | pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16); |
| 927 | for (j = i; j > 1; j--) |
| 928 | pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16); |
| 929 | |
| 930 | pol[1] -= lsp[2 * i]; |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order) |
| 935 | { |
| 936 | int i, k; |
| 937 | int32_t lsp[16]; // Q17; 2*cos(LSF) |
| 938 | int32_t p[9], q[9]; // Q16 |
| 939 | int32_t lpc32[16]; // Q17 |
| 940 | int16_t lpc[16]; // Q12 |
| 941 | |
| 942 | /* convert the LSFs to LSPs, i.e. 2*cos(LSF) */ |
| 943 | for (k = 0; k < order; k++) { |
| 944 | int index = nlsf[k] >> 8; |
| 945 | int offset = nlsf[k] & 255; |
| 946 | int k2 = (order == 10) ? silk_lsf_ordering_nbmb[k] : silk_lsf_ordering_wb[k]; |
| 947 | |
| 948 | /* interpolate and round */ |
| 949 | lsp[k2] = silk_cosine[index] * 256; |
| 950 | lsp[k2] += (silk_cosine[index + 1] - silk_cosine[index]) * offset; |
| 951 | lsp[k2] = (lsp[k2] + 4) >> 3; |
| 952 | } |
| 953 | |
| 954 | silk_lsp2poly(lsp , p, order >> 1); |
| 955 | silk_lsp2poly(lsp + 1, q, order >> 1); |
| 956 | |
| 957 | /* reconstruct A(z) */ |
| 958 | for (k = 0; k < order>>1; k++) { |
| 959 | lpc32[k] = -p[k + 1] - p[k] - q[k + 1] + q[k]; |
| 960 | lpc32[order-k-1] = -p[k + 1] - p[k] + q[k + 1] - q[k]; |
| 961 | } |
| 962 | |
| 963 | /* limit the range of the LPC coefficients to each fit within an int16_t */ |
| 964 | for (i = 0; i < 10; i++) { |
| 965 | int j; |
| 966 | unsigned int maxabs = 0; |
| 967 | for (j = 0, k = 0; j < order; j++) { |
| 968 | unsigned int x = FFABS(lpc32[k]); |
| 969 | if (x > maxabs) { |
| 970 | maxabs = x; // Q17 |
| 971 | k = j; |
| 972 | } |
| 973 | } |
| 974 | |
| 975 | maxabs = (maxabs + 16) >> 5; // convert to Q12 |
| 976 | |
| 977 | if (maxabs > 32767) { |
| 978 | /* perform bandwidth expansion */ |
| 979 | unsigned int chirp, chirp_base; // Q16 |
| 980 | maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator |
| 981 | chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2); |
| 982 | |
| 983 | for (k = 0; k < order; k++) { |
| 984 | lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); |
| 985 | chirp = (chirp_base * chirp + 32768) >> 16; |
| 986 | } |
| 987 | } else break; |
| 988 | } |
| 989 | |
| 990 | if (i == 10) { |
| 991 | /* time's up: just clamp */ |
| 992 | for (k = 0; k < order; k++) { |
| 993 | int x = (lpc32[k] + 16) >> 5; |
| 994 | lpc[k] = av_clip_int16(x); |
| 995 | lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits |
| 996 | } |
| 997 | } else { |
| 998 | for (k = 0; k < order; k++) |
| 999 | lpc[k] = (lpc32[k] + 16) >> 5; |
| 1000 | } |
| 1001 | |
| 1002 | /* if the prediction gain causes the LPC filter to become unstable, |
| 1003 | apply further bandwidth expansion on the Q17 coefficients */ |
| 1004 | for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) { |
| 1005 | unsigned int chirp, chirp_base; |
| 1006 | chirp_base = chirp = 65536 - (1 << i); |
| 1007 | |
| 1008 | for (k = 0; k < order; k++) { |
| 1009 | lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); |
| 1010 | lpc[k] = (lpc32[k] + 16) >> 5; |
| 1011 | chirp = (chirp_base * chirp + 32768) >> 16; |
| 1012 | } |
| 1013 | } |
| 1014 | |
| 1015 | for (i = 0; i < order; i++) |
| 1016 | lpcf[i] = lpc[i] / 4096.0f; |
| 1017 | } |
| 1018 | |
| 1019 | static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame, |
| 1020 | OpusRangeCoder *rc, |
| 1021 | float lpc_leadin[16], float lpc[16], |
| 1022 | int *lpc_order, int *has_lpc_leadin, int voiced) |
| 1023 | { |
| 1024 | int i; |
| 1025 | int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB |
| 1026 | int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices |
| 1027 | int16_t lsf_res[16]; // residual as a Q10 value |
| 1028 | int16_t nlsf[16]; // Q15 |
| 1029 | |
| 1030 | *lpc_order = order = s->wb ? 16 : 10; |
| 1031 | |
| 1032 | /* obtain LSF stage-1 and stage-2 indices */ |
| 1033 | lsf_i1 = opus_rc_getsymbol(rc, silk_model_lsf_s1[s->wb][voiced]); |
| 1034 | for (i = 0; i < order; i++) { |
| 1035 | int index = s->wb ? silk_lsf_s2_model_sel_wb [lsf_i1][i] : |
| 1036 | silk_lsf_s2_model_sel_nbmb[lsf_i1][i]; |
| 1037 | lsf_i2[i] = opus_rc_getsymbol(rc, silk_model_lsf_s2[index]) - 4; |
| 1038 | if (lsf_i2[i] == -4) |
| 1039 | lsf_i2[i] -= opus_rc_getsymbol(rc, silk_model_lsf_s2_ext); |
| 1040 | else if (lsf_i2[i] == 4) |
| 1041 | lsf_i2[i] += opus_rc_getsymbol(rc, silk_model_lsf_s2_ext); |
| 1042 | } |
| 1043 | |
| 1044 | /* reverse the backwards-prediction step */ |
| 1045 | for (i = order - 1; i >= 0; i--) { |
| 1046 | int qstep = s->wb ? 9830 : 11796; |
| 1047 | |
| 1048 | lsf_res[i] = lsf_i2[i] * 1024; |
| 1049 | if (lsf_i2[i] < 0) lsf_res[i] += 102; |
| 1050 | else if (lsf_i2[i] > 0) lsf_res[i] -= 102; |
| 1051 | lsf_res[i] = (lsf_res[i] * qstep) >> 16; |
| 1052 | |
| 1053 | if (i + 1 < order) { |
| 1054 | int weight = s->wb ? silk_lsf_pred_weights_wb [silk_lsf_weight_sel_wb [lsf_i1][i]][i] : |
| 1055 | silk_lsf_pred_weights_nbmb[silk_lsf_weight_sel_nbmb[lsf_i1][i]][i]; |
| 1056 | lsf_res[i] += (lsf_res[i+1] * weight) >> 8; |
| 1057 | } |
| 1058 | } |
| 1059 | |
| 1060 | /* reconstruct the NLSF coefficients from the supplied indices */ |
| 1061 | for (i = 0; i < order; i++) { |
| 1062 | const uint8_t * codebook = s->wb ? silk_lsf_codebook_wb [lsf_i1] : |
| 1063 | silk_lsf_codebook_nbmb[lsf_i1]; |
| 1064 | int cur, prev, next, weight_sq, weight, ipart, fpart, y, value; |
| 1065 | |
| 1066 | /* find the weight of the residual */ |
| 1067 | /* TODO: precompute */ |
| 1068 | cur = codebook[i]; |
| 1069 | prev = i ? codebook[i - 1] : 0; |
| 1070 | next = i + 1 < order ? codebook[i + 1] : 256; |
| 1071 | weight_sq = (1024 / (cur - prev) + 1024 / (next - cur)) << 16; |
| 1072 | |
| 1073 | /* approximate square-root with mandated fixed-point arithmetic */ |
| 1074 | ipart = opus_ilog(weight_sq); |
| 1075 | fpart = (weight_sq >> (ipart-8)) & 127; |
| 1076 | y = ((ipart & 1) ? 32768 : 46214) >> ((32 - ipart)>>1); |
| 1077 | weight = y + ((213 * fpart * y) >> 16); |
| 1078 | |
| 1079 | value = cur * 128 + (lsf_res[i] * 16384) / weight; |
| 1080 | nlsf[i] = av_clip(value, 0, 32767); |
| 1081 | } |
| 1082 | |
| 1083 | /* stabilize the NLSF coefficients */ |
| 1084 | silk_stabilize_lsf(nlsf, order, s->wb ? silk_lsf_min_spacing_wb : |
| 1085 | silk_lsf_min_spacing_nbmb); |
| 1086 | |
| 1087 | /* produce an interpolation for the first 2 subframes, */ |
| 1088 | /* and then convert both sets of NLSFs to LPC coefficients */ |
| 1089 | *has_lpc_leadin = 0; |
| 1090 | if (s->subframes == 4) { |
| 1091 | int offset = opus_rc_getsymbol(rc, silk_model_lsf_interpolation_offset); |
| 1092 | if (offset != 4 && frame->coded) { |
| 1093 | *has_lpc_leadin = 1; |
| 1094 | if (offset != 0) { |
| 1095 | int16_t nlsf_leadin[16]; |
| 1096 | for (i = 0; i < order; i++) |
| 1097 | nlsf_leadin[i] = frame->nlsf[i] + |
| 1098 | ((nlsf[i] - frame->nlsf[i]) * offset >> 2); |
| 1099 | silk_lsf2lpc(nlsf_leadin, lpc_leadin, order); |
| 1100 | } else /* avoid re-computation for a (roughly) 1-in-4 occurrence */ |
| 1101 | memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float)); |
| 1102 | } else |
| 1103 | offset = 4; |
| 1104 | s->nlsf_interp_factor = offset; |
| 1105 | |
| 1106 | silk_lsf2lpc(nlsf, lpc, order); |
| 1107 | } else { |
| 1108 | s->nlsf_interp_factor = 4; |
| 1109 | silk_lsf2lpc(nlsf, lpc, order); |
| 1110 | } |
| 1111 | |
| 1112 | memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0])); |
| 1113 | memcpy(frame->lpc, lpc, order * sizeof(lpc[0])); |
| 1114 | } |
| 1115 | |
| 1116 | static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total, |
| 1117 | int32_t child[2]) |
| 1118 | { |
| 1119 | if (total != 0) { |
| 1120 | child[0] = opus_rc_getsymbol(rc, |
| 1121 | silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1)); |
| 1122 | child[1] = total - child[0]; |
| 1123 | } else { |
| 1124 | child[0] = 0; |
| 1125 | child[1] = 0; |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc, |
| 1130 | float* excitationf, |
| 1131 | int qoffset_high, int active, int voiced) |
| 1132 | { |
| 1133 | int i; |
| 1134 | uint32_t seed; |
| 1135 | int shellblocks; |
| 1136 | int ratelevel; |
| 1137 | uint8_t pulsecount[20]; // total pulses in each shell block |
| 1138 | uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block |
| 1139 | int32_t excitation[320]; // Q23 |
| 1140 | |
| 1141 | /* excitation parameters */ |
| 1142 | seed = opus_rc_getsymbol(rc, silk_model_lcg_seed); |
| 1143 | shellblocks = silk_shell_blocks[s->bandwidth][s->subframes >> 2]; |
| 1144 | ratelevel = opus_rc_getsymbol(rc, silk_model_exc_rate[voiced]); |
| 1145 | |
| 1146 | for (i = 0; i < shellblocks; i++) { |
| 1147 | pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[ratelevel]); |
| 1148 | if (pulsecount[i] == 17) { |
| 1149 | while (pulsecount[i] == 17 && ++lsbcount[i] != 10) |
| 1150 | pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[9]); |
| 1151 | if (lsbcount[i] == 10) |
| 1152 | pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[10]); |
| 1153 | } |
| 1154 | } |
| 1155 | |
| 1156 | /* decode pulse locations using PVQ */ |
| 1157 | for (i = 0; i < shellblocks; i++) { |
| 1158 | if (pulsecount[i] != 0) { |
| 1159 | int a, b, c, d; |
| 1160 | int32_t * location = excitation + 16*i; |
| 1161 | int32_t branch[4][2]; |
| 1162 | branch[0][0] = pulsecount[i]; |
| 1163 | |
| 1164 | /* unrolled tail recursion */ |
| 1165 | for (a = 0; a < 1; a++) { |
| 1166 | silk_count_children(rc, 0, branch[0][a], branch[1]); |
| 1167 | for (b = 0; b < 2; b++) { |
| 1168 | silk_count_children(rc, 1, branch[1][b], branch[2]); |
| 1169 | for (c = 0; c < 2; c++) { |
| 1170 | silk_count_children(rc, 2, branch[2][c], branch[3]); |
| 1171 | for (d = 0; d < 2; d++) { |
| 1172 | silk_count_children(rc, 3, branch[3][d], location); |
| 1173 | location += 2; |
| 1174 | } |
| 1175 | } |
| 1176 | } |
| 1177 | } |
| 1178 | } else |
| 1179 | memset(excitation + 16*i, 0, 16*sizeof(int32_t)); |
| 1180 | } |
| 1181 | |
| 1182 | /* decode least significant bits */ |
| 1183 | for (i = 0; i < shellblocks << 4; i++) { |
| 1184 | int bit; |
| 1185 | for (bit = 0; bit < lsbcount[i >> 4]; bit++) |
| 1186 | excitation[i] = (excitation[i] << 1) | |
| 1187 | opus_rc_getsymbol(rc, silk_model_excitation_lsb); |
| 1188 | } |
| 1189 | |
| 1190 | /* decode signs */ |
| 1191 | for (i = 0; i < shellblocks << 4; i++) { |
| 1192 | if (excitation[i] != 0) { |
| 1193 | int sign = opus_rc_getsymbol(rc, silk_model_excitation_sign[active + |
| 1194 | voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]); |
| 1195 | if (sign == 0) |
| 1196 | excitation[i] *= -1; |
| 1197 | } |
| 1198 | } |
| 1199 | |
| 1200 | /* assemble the excitation */ |
| 1201 | for (i = 0; i < shellblocks << 4; i++) { |
| 1202 | int value = excitation[i]; |
| 1203 | excitation[i] = value * 256 | silk_quant_offset[voiced][qoffset_high]; |
| 1204 | if (value < 0) excitation[i] += 20; |
| 1205 | else if (value > 0) excitation[i] -= 20; |
| 1206 | |
| 1207 | /* invert samples pseudorandomly */ |
| 1208 | seed = 196314165 * seed + 907633515; |
| 1209 | if (seed & 0x80000000) |
| 1210 | excitation[i] *= -1; |
| 1211 | seed += value; |
| 1212 | |
| 1213 | excitationf[i] = excitation[i] / 8388608.0f; |
| 1214 | } |
| 1215 | } |
| 1216 | |
| 1217 | /** Maximum residual history according to 4.2.7.6.1 */ |
| 1218 | #define SILK_MAX_LAG (288 + LTP_ORDER / 2) |
| 1219 | |
| 1220 | /** Order of the LTP filter */ |
| 1221 | #define LTP_ORDER 5 |
| 1222 | |
| 1223 | static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc, |
| 1224 | int frame_num, int channel, int coded_channels, int active, int active1) |
| 1225 | { |
| 1226 | /* per frame */ |
| 1227 | int voiced; // combines with active to indicate inactive, active, or active+voiced |
| 1228 | int qoffset_high; |
| 1229 | int order; // order of the LPC coefficients |
| 1230 | float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY]; |
| 1231 | int has_lpc_leadin; |
| 1232 | float ltpscale; |
| 1233 | |
| 1234 | /* per subframe */ |
| 1235 | struct { |
| 1236 | float gain; |
| 1237 | int pitchlag; |
| 1238 | float ltptaps[5]; |
| 1239 | } sf[4]; |
| 1240 | |
| 1241 | SilkFrame * const frame = s->frame + channel; |
| 1242 | |
| 1243 | int i; |
| 1244 | |
| 1245 | /* obtain stereo weights */ |
| 1246 | if (coded_channels == 2 && channel == 0) { |
| 1247 | int n, wi[2], ws[2], w[2]; |
| 1248 | n = opus_rc_getsymbol(rc, silk_model_stereo_s1); |
| 1249 | wi[0] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n / 5); |
| 1250 | ws[0] = opus_rc_getsymbol(rc, silk_model_stereo_s3); |
| 1251 | wi[1] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n % 5); |
| 1252 | ws[1] = opus_rc_getsymbol(rc, silk_model_stereo_s3); |
| 1253 | |
| 1254 | for (i = 0; i < 2; i++) |
| 1255 | w[i] = silk_stereo_weights[wi[i]] + |
| 1256 | (((silk_stereo_weights[wi[i] + 1] - silk_stereo_weights[wi[i]]) * 6554) >> 16) |
| 1257 | * (ws[i]*2 + 1); |
| 1258 | |
| 1259 | s->stereo_weights[0] = (w[0] - w[1]) / 8192.0; |
| 1260 | s->stereo_weights[1] = w[1] / 8192.0; |
| 1261 | |
| 1262 | /* and read the mid-only flag */ |
| 1263 | s->midonly = active1 ? 0 : opus_rc_getsymbol(rc, silk_model_mid_only); |
| 1264 | } |
| 1265 | |
| 1266 | /* obtain frame type */ |
| 1267 | if (!active) { |
| 1268 | qoffset_high = opus_rc_getsymbol(rc, silk_model_frame_type_inactive); |
| 1269 | voiced = 0; |
| 1270 | } else { |
| 1271 | int type = opus_rc_getsymbol(rc, silk_model_frame_type_active); |
| 1272 | qoffset_high = type & 1; |
| 1273 | voiced = type >> 1; |
| 1274 | } |
| 1275 | |
| 1276 | /* obtain subframe quantization gains */ |
| 1277 | for (i = 0; i < s->subframes; i++) { |
| 1278 | int log_gain; //Q7 |
| 1279 | int ipart, fpart, lingain; |
| 1280 | |
| 1281 | if (i == 0 && (frame_num == 0 || !frame->coded)) { |
| 1282 | /* gain is coded absolute */ |
| 1283 | int x = opus_rc_getsymbol(rc, silk_model_gain_highbits[active + voiced]); |
| 1284 | log_gain = (x<<3) | opus_rc_getsymbol(rc, silk_model_gain_lowbits); |
| 1285 | |
| 1286 | if (frame->coded) |
| 1287 | log_gain = FFMAX(log_gain, frame->log_gain - 16); |
| 1288 | } else { |
| 1289 | /* gain is coded relative */ |
| 1290 | int delta_gain = opus_rc_getsymbol(rc, silk_model_gain_delta); |
| 1291 | log_gain = av_clip(FFMAX((delta_gain<<1) - 16, |
| 1292 | frame->log_gain + delta_gain - 4), 0, 63); |
| 1293 | } |
| 1294 | |
| 1295 | frame->log_gain = log_gain; |
| 1296 | |
| 1297 | /* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */ |
| 1298 | log_gain = (log_gain * 0x1D1C71 >> 16) + 2090; |
| 1299 | ipart = log_gain >> 7; |
| 1300 | fpart = log_gain & 127; |
| 1301 | lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<<ipart) >> 7); |
| 1302 | sf[i].gain = lingain / 65536.0f; |
| 1303 | } |
| 1304 | |
| 1305 | /* obtain LPC filter coefficients */ |
| 1306 | silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced); |
| 1307 | |
| 1308 | /* obtain pitch lags, if this is a voiced frame */ |
| 1309 | if (voiced) { |
| 1310 | int lag_absolute = (!frame_num || !frame->prev_voiced); |
| 1311 | int primarylag; // primary pitch lag for the entire SILK frame |
| 1312 | int ltpfilter; |
| 1313 | const int8_t * offsets; |
| 1314 | |
| 1315 | if (!lag_absolute) { |
| 1316 | int delta = opus_rc_getsymbol(rc, silk_model_pitch_delta); |
| 1317 | if (delta) |
| 1318 | primarylag = frame->primarylag + delta - 9; |
| 1319 | else |
| 1320 | lag_absolute = 1; |
| 1321 | } |
| 1322 | |
| 1323 | if (lag_absolute) { |
| 1324 | /* primary lag is coded absolute */ |
| 1325 | int highbits, lowbits; |
| 1326 | const uint16_t *model[] = { |
| 1327 | silk_model_pitch_lowbits_nb, silk_model_pitch_lowbits_mb, |
| 1328 | silk_model_pitch_lowbits_wb |
| 1329 | }; |
| 1330 | highbits = opus_rc_getsymbol(rc, silk_model_pitch_highbits); |
| 1331 | lowbits = opus_rc_getsymbol(rc, model[s->bandwidth]); |
| 1332 | |
| 1333 | primarylag = silk_pitch_min_lag[s->bandwidth] + |
| 1334 | highbits*silk_pitch_scale[s->bandwidth] + lowbits; |
| 1335 | } |
| 1336 | frame->primarylag = primarylag; |
| 1337 | |
| 1338 | if (s->subframes == 2) |
| 1339 | offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) |
| 1340 | ? silk_pitch_offset_nb10ms[opus_rc_getsymbol(rc, |
| 1341 | silk_model_pitch_contour_nb10ms)] |
| 1342 | : silk_pitch_offset_mbwb10ms[opus_rc_getsymbol(rc, |
| 1343 | silk_model_pitch_contour_mbwb10ms)]; |
| 1344 | else |
| 1345 | offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) |
| 1346 | ? silk_pitch_offset_nb20ms[opus_rc_getsymbol(rc, |
| 1347 | silk_model_pitch_contour_nb20ms)] |
| 1348 | : silk_pitch_offset_mbwb20ms[opus_rc_getsymbol(rc, |
| 1349 | silk_model_pitch_contour_mbwb20ms)]; |
| 1350 | |
| 1351 | for (i = 0; i < s->subframes; i++) |
| 1352 | sf[i].pitchlag = av_clip(primarylag + offsets[i], |
| 1353 | silk_pitch_min_lag[s->bandwidth], |
| 1354 | silk_pitch_max_lag[s->bandwidth]); |
| 1355 | |
| 1356 | /* obtain LTP filter coefficients */ |
| 1357 | ltpfilter = opus_rc_getsymbol(rc, silk_model_ltp_filter); |
| 1358 | for (i = 0; i < s->subframes; i++) { |
| 1359 | int index, j; |
| 1360 | const uint16_t *filter_sel[] = { |
| 1361 | silk_model_ltp_filter0_sel, silk_model_ltp_filter1_sel, |
| 1362 | silk_model_ltp_filter2_sel |
| 1363 | }; |
| 1364 | const int8_t (*filter_taps[])[5] = { |
| 1365 | silk_ltp_filter0_taps, silk_ltp_filter1_taps, silk_ltp_filter2_taps |
| 1366 | }; |
| 1367 | index = opus_rc_getsymbol(rc, filter_sel[ltpfilter]); |
| 1368 | for (j = 0; j < 5; j++) |
| 1369 | sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f; |
| 1370 | } |
| 1371 | } |
| 1372 | |
| 1373 | /* obtain LTP scale factor */ |
| 1374 | if (voiced && frame_num == 0) |
| 1375 | ltpscale = silk_ltp_scale_factor[opus_rc_getsymbol(rc, |
| 1376 | silk_model_ltp_scale_index)] / 16384.0f; |
| 1377 | else ltpscale = 15565.0f/16384.0f; |
| 1378 | |
| 1379 | /* generate the excitation signal for the entire frame */ |
| 1380 | silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high, |
| 1381 | active, voiced); |
| 1382 | |
| 1383 | /* skip synthesising the side channel if we want mono-only */ |
| 1384 | if (s->output_channels == channel) |
| 1385 | return; |
| 1386 | |
| 1387 | /* generate the output signal */ |
| 1388 | for (i = 0; i < s->subframes; i++) { |
| 1389 | const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body; |
| 1390 | float *dst = frame->output + SILK_HISTORY + i * s->sflength; |
| 1391 | float *resptr = residual + SILK_MAX_LAG + i * s->sflength; |
| 1392 | float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength; |
| 1393 | float sum; |
| 1394 | int j, k; |
| 1395 | |
| 1396 | if (voiced) { |
| 1397 | int out_end; |
| 1398 | float scale; |
| 1399 | |
| 1400 | if (i < 2 || s->nlsf_interp_factor == 4) { |
| 1401 | out_end = -i * s->sflength; |
| 1402 | scale = ltpscale; |
| 1403 | } else { |
| 1404 | out_end = -(i - 2) * s->sflength; |
| 1405 | scale = 1.0f; |
| 1406 | } |
| 1407 | |
| 1408 | /* when the LPC coefficients change, a re-whitening filter is used */ |
| 1409 | /* to produce a residual that accounts for the change */ |
| 1410 | for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) { |
| 1411 | sum = dst[j]; |
| 1412 | for (k = 0; k < order; k++) |
| 1413 | sum -= lpc_coeff[k] * dst[j - k - 1]; |
| 1414 | resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain; |
| 1415 | } |
| 1416 | |
| 1417 | if (out_end) { |
| 1418 | float rescale = sf[i-1].gain / sf[i].gain; |
| 1419 | for (j = out_end; j < 0; j++) |
| 1420 | resptr[j] *= rescale; |
| 1421 | } |
| 1422 | |
| 1423 | /* LTP synthesis */ |
| 1424 | for (j = 0; j < s->sflength; j++) { |
| 1425 | sum = resptr[j]; |
| 1426 | for (k = 0; k < LTP_ORDER; k++) |
| 1427 | sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k]; |
| 1428 | resptr[j] = sum; |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | /* LPC synthesis */ |
| 1433 | for (j = 0; j < s->sflength; j++) { |
| 1434 | sum = resptr[j] * sf[i].gain; |
| 1435 | for (k = 1; k <= order; k++) |
| 1436 | sum += lpc_coeff[k - 1] * lpc[j - k]; |
| 1437 | |
| 1438 | lpc[j] = sum; |
| 1439 | dst[j] = av_clipf(sum, -1.0f, 1.0f); |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | frame->prev_voiced = voiced; |
| 1444 | memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float)); |
| 1445 | memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float)); |
| 1446 | |
| 1447 | frame->coded = 1; |
| 1448 | } |
| 1449 | |
| 1450 | static void silk_unmix_ms(SilkContext *s, float *l, float *r) |
| 1451 | { |
| 1452 | float *mid = s->frame[0].output + SILK_HISTORY - s->flength; |
| 1453 | float *side = s->frame[1].output + SILK_HISTORY - s->flength; |
| 1454 | float w0_prev = s->prev_stereo_weights[0]; |
| 1455 | float w1_prev = s->prev_stereo_weights[1]; |
| 1456 | float w0 = s->stereo_weights[0]; |
| 1457 | float w1 = s->stereo_weights[1]; |
| 1458 | int n1 = silk_stereo_interp_len[s->bandwidth]; |
| 1459 | int i; |
| 1460 | |
| 1461 | for (i = 0; i < n1; i++) { |
| 1462 | float interp0 = w0_prev + i * (w0 - w0_prev) / n1; |
| 1463 | float interp1 = w1_prev + i * (w1 - w1_prev) / n1; |
| 1464 | float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); |
| 1465 | |
| 1466 | l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0); |
| 1467 | r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0); |
| 1468 | } |
| 1469 | |
| 1470 | for (; i < s->flength; i++) { |
| 1471 | float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); |
| 1472 | |
| 1473 | l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0); |
| 1474 | r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0); |
| 1475 | } |
| 1476 | |
| 1477 | memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights)); |
| 1478 | } |
| 1479 | |
| 1480 | static void silk_flush_frame(SilkFrame *frame) |
| 1481 | { |
| 1482 | if (!frame->coded) |
| 1483 | return; |
| 1484 | |
| 1485 | memset(frame->output, 0, sizeof(frame->output)); |
| 1486 | memset(frame->lpc_history, 0, sizeof(frame->lpc_history)); |
| 1487 | |
| 1488 | memset(frame->lpc, 0, sizeof(frame->lpc)); |
| 1489 | memset(frame->nlsf, 0, sizeof(frame->nlsf)); |
| 1490 | |
| 1491 | frame->log_gain = 0; |
| 1492 | |
| 1493 | frame->primarylag = 0; |
| 1494 | frame->prev_voiced = 0; |
| 1495 | frame->coded = 0; |
| 1496 | } |
| 1497 | |
| 1498 | int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc, |
| 1499 | float *output[2], |
| 1500 | enum OpusBandwidth bandwidth, |
| 1501 | int coded_channels, |
| 1502 | int duration_ms) |
| 1503 | { |
| 1504 | int active[2][6], redundancy[2]; |
| 1505 | int nb_frames, i, j; |
| 1506 | |
| 1507 | if (bandwidth > OPUS_BANDWIDTH_WIDEBAND || |
| 1508 | coded_channels > 2 || duration_ms > 60) { |
| 1509 | av_log(s->avctx, AV_LOG_ERROR, "Invalid parameters passed " |
| 1510 | "to the SILK decoder.\n"); |
| 1511 | return AVERROR(EINVAL); |
| 1512 | } |
| 1513 | |
| 1514 | nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40); |
| 1515 | s->subframes = duration_ms / nb_frames / 5; // 5ms subframes |
| 1516 | s->sflength = 20 * (bandwidth + 2); |
| 1517 | s->flength = s->sflength * s->subframes; |
| 1518 | s->bandwidth = bandwidth; |
| 1519 | s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND; |
| 1520 | |
| 1521 | /* make sure to flush the side channel when switching from mono to stereo */ |
| 1522 | if (coded_channels > s->prev_coded_channels) |
| 1523 | silk_flush_frame(&s->frame[1]); |
| 1524 | s->prev_coded_channels = coded_channels; |
| 1525 | |
| 1526 | /* read the LP-layer header bits */ |
| 1527 | for (i = 0; i < coded_channels; i++) { |
| 1528 | for (j = 0; j < nb_frames; j++) |
| 1529 | active[i][j] = opus_rc_p2model(rc, 1); |
| 1530 | |
| 1531 | redundancy[i] = opus_rc_p2model(rc, 1); |
| 1532 | if (redundancy[i]) { |
| 1533 | av_log(s->avctx, AV_LOG_ERROR, "LBRR frames present; this is unsupported\n"); |
| 1534 | return AVERROR_PATCHWELCOME; |
| 1535 | } |
| 1536 | } |
| 1537 | |
| 1538 | for (i = 0; i < nb_frames; i++) { |
| 1539 | for (j = 0; j < coded_channels && !s->midonly; j++) |
| 1540 | silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active[1][i]); |
| 1541 | |
| 1542 | /* reset the side channel if it is not coded */ |
| 1543 | if (s->midonly && s->frame[1].coded) |
| 1544 | silk_flush_frame(&s->frame[1]); |
| 1545 | |
| 1546 | if (coded_channels == 1 || s->output_channels == 1) { |
| 1547 | for (j = 0; j < s->output_channels; j++) { |
| 1548 | memcpy(output[j] + i * s->flength, |
| 1549 | s->frame[0].output + SILK_HISTORY - s->flength - 2, |
| 1550 | s->flength * sizeof(float)); |
| 1551 | } |
| 1552 | } else { |
| 1553 | silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength); |
| 1554 | } |
| 1555 | |
| 1556 | s->midonly = 0; |
| 1557 | } |
| 1558 | |
| 1559 | return nb_frames * s->flength; |
| 1560 | } |
| 1561 | |
| 1562 | void ff_silk_free(SilkContext **ps) |
| 1563 | { |
| 1564 | av_freep(ps); |
| 1565 | } |
| 1566 | |
| 1567 | void ff_silk_flush(SilkContext *s) |
| 1568 | { |
| 1569 | silk_flush_frame(&s->frame[0]); |
| 1570 | silk_flush_frame(&s->frame[1]); |
| 1571 | |
| 1572 | memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights)); |
| 1573 | } |
| 1574 | |
| 1575 | int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels) |
| 1576 | { |
| 1577 | SilkContext *s; |
| 1578 | |
| 1579 | if (output_channels != 1 && output_channels != 2) { |
| 1580 | av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n", |
| 1581 | output_channels); |
| 1582 | return AVERROR(EINVAL); |
| 1583 | } |
| 1584 | |
| 1585 | s = av_mallocz(sizeof(*s)); |
| 1586 | if (!s) |
| 1587 | return AVERROR(ENOMEM); |
| 1588 | |
| 1589 | s->avctx = avctx; |
| 1590 | s->output_channels = output_channels; |
| 1591 | |
| 1592 | ff_silk_flush(s); |
| 1593 | |
| 1594 | *ps = s; |
| 1595 | |
| 1596 | return 0; |
| 1597 | } |