| 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 CELT decoder |
| 25 | */ |
| 26 | |
| 27 | #include <stdint.h> |
| 28 | |
| 29 | #include "libavutil/float_dsp.h" |
| 30 | |
| 31 | #include "opus.h" |
| 32 | #include "opus_imdct.h" |
| 33 | |
| 34 | enum CeltSpread { |
| 35 | CELT_SPREAD_NONE, |
| 36 | CELT_SPREAD_LIGHT, |
| 37 | CELT_SPREAD_NORMAL, |
| 38 | CELT_SPREAD_AGGRESSIVE |
| 39 | }; |
| 40 | |
| 41 | typedef struct CeltFrame { |
| 42 | float energy[CELT_MAX_BANDS]; |
| 43 | float prev_energy[2][CELT_MAX_BANDS]; |
| 44 | |
| 45 | uint8_t collapse_masks[CELT_MAX_BANDS]; |
| 46 | |
| 47 | /* buffer for mdct output + postfilter */ |
| 48 | DECLARE_ALIGNED(32, float, buf)[2048]; |
| 49 | |
| 50 | /* postfilter parameters */ |
| 51 | int pf_period_new; |
| 52 | float pf_gains_new[3]; |
| 53 | int pf_period; |
| 54 | float pf_gains[3]; |
| 55 | int pf_period_old; |
| 56 | float pf_gains_old[3]; |
| 57 | |
| 58 | float deemph_coeff; |
| 59 | } CeltFrame; |
| 60 | |
| 61 | struct CeltContext { |
| 62 | // constant values that do not change during context lifetime |
| 63 | AVCodecContext *avctx; |
| 64 | CeltIMDCTContext *imdct[4]; |
| 65 | AVFloatDSPContext dsp; |
| 66 | int output_channels; |
| 67 | |
| 68 | // values that have inter-frame effect and must be reset on flush |
| 69 | CeltFrame frame[2]; |
| 70 | uint32_t seed; |
| 71 | int flushed; |
| 72 | |
| 73 | // values that only affect a single frame |
| 74 | int coded_channels; |
| 75 | int framebits; |
| 76 | int duration; |
| 77 | |
| 78 | /* number of iMDCT blocks in the frame */ |
| 79 | int blocks; |
| 80 | /* size of each block */ |
| 81 | int blocksize; |
| 82 | |
| 83 | int startband; |
| 84 | int endband; |
| 85 | int codedbands; |
| 86 | |
| 87 | int anticollapse_bit; |
| 88 | |
| 89 | int intensitystereo; |
| 90 | int dualstereo; |
| 91 | enum CeltSpread spread; |
| 92 | |
| 93 | int remaining; |
| 94 | int remaining2; |
| 95 | int fine_bits [CELT_MAX_BANDS]; |
| 96 | int fine_priority[CELT_MAX_BANDS]; |
| 97 | int pulses [CELT_MAX_BANDS]; |
| 98 | int tf_change [CELT_MAX_BANDS]; |
| 99 | |
| 100 | DECLARE_ALIGNED(32, float, coeffs)[2][CELT_MAX_FRAME_SIZE]; |
| 101 | DECLARE_ALIGNED(32, float, scratch)[22 * 8]; // MAX(celt_freq_range) * 1<<CELT_MAX_LOG_BLOCKS |
| 102 | }; |
| 103 | |
| 104 | static const uint16_t celt_model_tapset[] = { 4, 2, 3, 4 }; |
| 105 | |
| 106 | static const uint16_t celt_model_spread[] = { 32, 7, 9, 30, 32 }; |
| 107 | |
| 108 | static const uint16_t celt_model_alloc_trim[] = { |
| 109 | 128, 2, 4, 9, 19, 41, 87, 109, 119, 124, 126, 128 |
| 110 | }; |
| 111 | |
| 112 | static const uint16_t celt_model_energy_small[] = { 4, 2, 3, 4 }; |
| 113 | |
| 114 | static const uint8_t celt_freq_bands[] = { /* in steps of 200Hz */ |
| 115 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100 |
| 116 | }; |
| 117 | |
| 118 | static const uint8_t celt_freq_range[] = { |
| 119 | 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 6, 6, 8, 12, 18, 22 |
| 120 | }; |
| 121 | |
| 122 | static const uint8_t celt_log_freq_range[] = { |
| 123 | 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 16, 16, 16, 21, 21, 24, 29, 34, 36 |
| 124 | }; |
| 125 | |
| 126 | static const int8_t celt_tf_select[4][2][2][2] = { |
| 127 | { { { 0, -1 }, { 0, -1 } }, { { 0, -1 }, { 0, -1 } } }, |
| 128 | { { { 0, -1 }, { 0, -2 } }, { { 1, 0 }, { 1, -1 } } }, |
| 129 | { { { 0, -2 }, { 0, -3 } }, { { 2, 0 }, { 1, -1 } } }, |
| 130 | { { { 0, -2 }, { 0, -3 } }, { { 3, 0 }, { 1, -1 } } } |
| 131 | }; |
| 132 | |
| 133 | static const float celt_mean_energy[] = { |
| 134 | 6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f, |
| 135 | 4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f, |
| 136 | 4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f, |
| 137 | 4.500000f, 4.375000f, 4.625000f, 4.750000f, 4.437500f, |
| 138 | 3.750000f, 3.750000f, 3.750000f, 3.750000f, 3.750000f |
| 139 | }; |
| 140 | |
| 141 | static const float celt_alpha_coef[] = { |
| 142 | 29440.0f/32768.0f, 26112.0f/32768.0f, 21248.0f/32768.0f, 16384.0f/32768.0f |
| 143 | }; |
| 144 | |
| 145 | static const float celt_beta_coef[] = { /* TODO: precompute 1 minus this if the code ends up neater */ |
| 146 | 30147.0f/32768.0f, 22282.0f/32768.0f, 12124.0f/32768.0f, 6554.0f/32768.0f |
| 147 | }; |
| 148 | |
| 149 | static const uint8_t celt_coarse_energy_dist[4][2][42] = { |
| 150 | { |
| 151 | { // 120-sample inter |
| 152 | 72, 127, 65, 129, 66, 128, 65, 128, 64, 128, 62, 128, 64, 128, |
| 153 | 64, 128, 92, 78, 92, 79, 92, 78, 90, 79, 116, 41, 115, 40, |
| 154 | 114, 40, 132, 26, 132, 26, 145, 17, 161, 12, 176, 10, 177, 11 |
| 155 | }, { // 120-sample intra |
| 156 | 24, 179, 48, 138, 54, 135, 54, 132, 53, 134, 56, 133, 55, 132, |
| 157 | 55, 132, 61, 114, 70, 96, 74, 88, 75, 88, 87, 74, 89, 66, |
| 158 | 91, 67, 100, 59, 108, 50, 120, 40, 122, 37, 97, 43, 78, 50 |
| 159 | } |
| 160 | }, { |
| 161 | { // 240-sample inter |
| 162 | 83, 78, 84, 81, 88, 75, 86, 74, 87, 71, 90, 73, 93, 74, |
| 163 | 93, 74, 109, 40, 114, 36, 117, 34, 117, 34, 143, 17, 145, 18, |
| 164 | 146, 19, 162, 12, 165, 10, 178, 7, 189, 6, 190, 8, 177, 9 |
| 165 | }, { // 240-sample intra |
| 166 | 23, 178, 54, 115, 63, 102, 66, 98, 69, 99, 74, 89, 71, 91, |
| 167 | 73, 91, 78, 89, 86, 80, 92, 66, 93, 64, 102, 59, 103, 60, |
| 168 | 104, 60, 117, 52, 123, 44, 138, 35, 133, 31, 97, 38, 77, 45 |
| 169 | } |
| 170 | }, { |
| 171 | { // 480-sample inter |
| 172 | 61, 90, 93, 60, 105, 42, 107, 41, 110, 45, 116, 38, 113, 38, |
| 173 | 112, 38, 124, 26, 132, 27, 136, 19, 140, 20, 155, 14, 159, 16, |
| 174 | 158, 18, 170, 13, 177, 10, 187, 8, 192, 6, 175, 9, 159, 10 |
| 175 | }, { // 480-sample intra |
| 176 | 21, 178, 59, 110, 71, 86, 75, 85, 84, 83, 91, 66, 88, 73, |
| 177 | 87, 72, 92, 75, 98, 72, 105, 58, 107, 54, 115, 52, 114, 55, |
| 178 | 112, 56, 129, 51, 132, 40, 150, 33, 140, 29, 98, 35, 77, 42 |
| 179 | } |
| 180 | }, { |
| 181 | { // 960-sample inter |
| 182 | 42, 121, 96, 66, 108, 43, 111, 40, 117, 44, 123, 32, 120, 36, |
| 183 | 119, 33, 127, 33, 134, 34, 139, 21, 147, 23, 152, 20, 158, 25, |
| 184 | 154, 26, 166, 21, 173, 16, 184, 13, 184, 10, 150, 13, 139, 15 |
| 185 | }, { // 960-sample intra |
| 186 | 22, 178, 63, 114, 74, 82, 84, 83, 92, 82, 103, 62, 96, 72, |
| 187 | 96, 67, 101, 73, 107, 72, 113, 55, 118, 52, 125, 52, 118, 52, |
| 188 | 117, 55, 135, 49, 137, 39, 157, 32, 145, 29, 97, 33, 77, 40 |
| 189 | } |
| 190 | } |
| 191 | }; |
| 192 | |
| 193 | static const uint8_t celt_static_alloc[11][21] = { /* 1/32 bit/sample */ |
| 194 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 195 | { 90, 80, 75, 69, 63, 56, 49, 40, 34, 29, 20, 18, 10, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 196 | { 110, 100, 90, 84, 78, 71, 65, 58, 51, 45, 39, 32, 26, 20, 12, 0, 0, 0, 0, 0, 0 }, |
| 197 | { 118, 110, 103, 93, 86, 80, 75, 70, 65, 59, 53, 47, 40, 31, 23, 15, 4, 0, 0, 0, 0 }, |
| 198 | { 126, 119, 112, 104, 95, 89, 83, 78, 72, 66, 60, 54, 47, 39, 32, 25, 17, 12, 1, 0, 0 }, |
| 199 | { 134, 127, 120, 114, 103, 97, 91, 85, 78, 72, 66, 60, 54, 47, 41, 35, 29, 23, 16, 10, 1 }, |
| 200 | { 144, 137, 130, 124, 113, 107, 101, 95, 88, 82, 76, 70, 64, 57, 51, 45, 39, 33, 26, 15, 1 }, |
| 201 | { 152, 145, 138, 132, 123, 117, 111, 105, 98, 92, 86, 80, 74, 67, 61, 55, 49, 43, 36, 20, 1 }, |
| 202 | { 162, 155, 148, 142, 133, 127, 121, 115, 108, 102, 96, 90, 84, 77, 71, 65, 59, 53, 46, 30, 1 }, |
| 203 | { 172, 165, 158, 152, 143, 137, 131, 125, 118, 112, 106, 100, 94, 87, 81, 75, 69, 63, 56, 45, 20 }, |
| 204 | { 200, 200, 200, 200, 200, 200, 200, 200, 198, 193, 188, 183, 178, 173, 168, 163, 158, 153, 148, 129, 104 } |
| 205 | }; |
| 206 | |
| 207 | static const uint8_t celt_static_caps[4][2][21] = { |
| 208 | { // 120-sample |
| 209 | {224, 224, 224, 224, 224, 224, 224, 224, 160, 160, |
| 210 | 160, 160, 185, 185, 185, 178, 178, 168, 134, 61, 37}, |
| 211 | {224, 224, 224, 224, 224, 224, 224, 224, 240, 240, |
| 212 | 240, 240, 207, 207, 207, 198, 198, 183, 144, 66, 40}, |
| 213 | }, { // 240-sample |
| 214 | {160, 160, 160, 160, 160, 160, 160, 160, 185, 185, |
| 215 | 185, 185, 193, 193, 193, 183, 183, 172, 138, 64, 38}, |
| 216 | {240, 240, 240, 240, 240, 240, 240, 240, 207, 207, |
| 217 | 207, 207, 204, 204, 204, 193, 193, 180, 143, 66, 40}, |
| 218 | }, { // 480-sample |
| 219 | {185, 185, 185, 185, 185, 185, 185, 185, 193, 193, |
| 220 | 193, 193, 193, 193, 193, 183, 183, 172, 138, 65, 39}, |
| 221 | {207, 207, 207, 207, 207, 207, 207, 207, 204, 204, |
| 222 | 204, 204, 201, 201, 201, 188, 188, 176, 141, 66, 40}, |
| 223 | }, { // 960-sample |
| 224 | {193, 193, 193, 193, 193, 193, 193, 193, 193, 193, |
| 225 | 193, 193, 194, 194, 194, 184, 184, 173, 139, 65, 39}, |
| 226 | {204, 204, 204, 204, 204, 204, 204, 204, 201, 201, |
| 227 | 201, 201, 198, 198, 198, 187, 187, 175, 140, 66, 40} |
| 228 | } |
| 229 | }; |
| 230 | |
| 231 | static const uint8_t celt_cache_bits[392] = { |
| 232 | 40, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, |
| 233 | 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, |
| 234 | 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 40, 15, 23, 28, |
| 235 | 31, 34, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 47, 49, 50, |
| 236 | 51, 52, 53, 54, 55, 55, 57, 58, 59, 60, 61, 62, 63, 63, 65, |
| 237 | 66, 67, 68, 69, 70, 71, 71, 40, 20, 33, 41, 48, 53, 57, 61, |
| 238 | 64, 66, 69, 71, 73, 75, 76, 78, 80, 82, 85, 87, 89, 91, 92, |
| 239 | 94, 96, 98, 101, 103, 105, 107, 108, 110, 112, 114, 117, 119, 121, 123, |
| 240 | 124, 126, 128, 40, 23, 39, 51, 60, 67, 73, 79, 83, 87, 91, 94, |
| 241 | 97, 100, 102, 105, 107, 111, 115, 118, 121, 124, 126, 129, 131, 135, 139, |
| 242 | 142, 145, 148, 150, 153, 155, 159, 163, 166, 169, 172, 174, 177, 179, 35, |
| 243 | 28, 49, 65, 78, 89, 99, 107, 114, 120, 126, 132, 136, 141, 145, 149, |
| 244 | 153, 159, 165, 171, 176, 180, 185, 189, 192, 199, 205, 211, 216, 220, 225, |
| 245 | 229, 232, 239, 245, 251, 21, 33, 58, 79, 97, 112, 125, 137, 148, 157, |
| 246 | 166, 174, 182, 189, 195, 201, 207, 217, 227, 235, 243, 251, 17, 35, 63, |
| 247 | 86, 106, 123, 139, 152, 165, 177, 187, 197, 206, 214, 222, 230, 237, 250, |
| 248 | 25, 31, 55, 75, 91, 105, 117, 128, 138, 146, 154, 161, 168, 174, 180, |
| 249 | 185, 190, 200, 208, 215, 222, 229, 235, 240, 245, 255, 16, 36, 65, 89, |
| 250 | 110, 128, 144, 159, 173, 185, 196, 207, 217, 226, 234, 242, 250, 11, 41, |
| 251 | 74, 103, 128, 151, 172, 191, 209, 225, 241, 255, 9, 43, 79, 110, 138, |
| 252 | 163, 186, 207, 227, 246, 12, 39, 71, 99, 123, 144, 164, 182, 198, 214, |
| 253 | 228, 241, 253, 9, 44, 81, 113, 142, 168, 192, 214, 235, 255, 7, 49, |
| 254 | 90, 127, 160, 191, 220, 247, 6, 51, 95, 134, 170, 203, 234, 7, 47, |
| 255 | 87, 123, 155, 184, 212, 237, 6, 52, 97, 137, 174, 208, 240, 5, 57, |
| 256 | 106, 151, 192, 231, 5, 59, 111, 158, 202, 243, 5, 55, 103, 147, 187, |
| 257 | 224, 5, 60, 113, 161, 206, 248, 4, 65, 122, 175, 224, 4, 67, 127, |
| 258 | 182, 234 |
| 259 | }; |
| 260 | |
| 261 | static const int16_t celt_cache_index[105] = { |
| 262 | -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 41, 41, 41, |
| 263 | 82, 82, 123, 164, 200, 222, 0, 0, 0, 0, 0, 0, 0, 0, 41, |
| 264 | 41, 41, 41, 123, 123, 123, 164, 164, 240, 266, 283, 295, 41, 41, 41, |
| 265 | 41, 41, 41, 41, 41, 123, 123, 123, 123, 240, 240, 240, 266, 266, 305, |
| 266 | 318, 328, 336, 123, 123, 123, 123, 123, 123, 123, 123, 240, 240, 240, 240, |
| 267 | 305, 305, 305, 318, 318, 343, 351, 358, 364, 240, 240, 240, 240, 240, 240, |
| 268 | 240, 240, 305, 305, 305, 305, 343, 343, 343, 351, 351, 370, 376, 382, 387, |
| 269 | }; |
| 270 | |
| 271 | static const uint8_t celt_log2_frac[] = { |
| 272 | 0, 8, 13, 16, 19, 21, 23, 24, 26, 27, 28, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 36, 37, 37 |
| 273 | }; |
| 274 | |
| 275 | static const uint8_t celt_bit_interleave[] = { |
| 276 | 0, 1, 1, 1, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3 |
| 277 | }; |
| 278 | |
| 279 | static const uint8_t celt_bit_deinterleave[] = { |
| 280 | 0x00, 0x03, 0x0C, 0x0F, 0x30, 0x33, 0x3C, 0x3F, |
| 281 | 0xC0, 0xC3, 0xCC, 0xCF, 0xF0, 0xF3, 0xFC, 0xFF |
| 282 | }; |
| 283 | |
| 284 | static const uint8_t celt_hadamard_ordery[] = { |
| 285 | 1, 0, |
| 286 | 3, 0, 2, 1, |
| 287 | 7, 0, 4, 3, 6, 1, 5, 2, |
| 288 | 15, 0, 8, 7, 12, 3, 11, 4, 14, 1, 9, 6, 13, 2, 10, 5 |
| 289 | }; |
| 290 | |
| 291 | static const uint16_t celt_qn_exp2[] = { |
| 292 | 16384, 17866, 19483, 21247, 23170, 25267, 27554, 30048 |
| 293 | }; |
| 294 | |
| 295 | static const uint32_t celt_pvq_u[1272] = { |
| 296 | /* N = 0, K = 0...176 */ |
| 297 | 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 298 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 299 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 300 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 301 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 302 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 303 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 304 | /* N = 1, K = 1...176 */ |
| 305 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 306 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 307 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 308 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 309 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 310 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 311 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 312 | /* N = 2, K = 2...176 */ |
| 313 | 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, |
| 314 | 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, |
| 315 | 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, |
| 316 | 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, |
| 317 | 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, |
| 318 | 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, |
| 319 | 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, |
| 320 | 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, |
| 321 | 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, |
| 322 | 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, |
| 323 | 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, |
| 324 | /* N = 3, K = 3...176 */ |
| 325 | 13, 25, 41, 61, 85, 113, 145, 181, 221, 265, 313, 365, 421, 481, 545, 613, |
| 326 | 685, 761, 841, 925, 1013, 1105, 1201, 1301, 1405, 1513, 1625, 1741, 1861, |
| 327 | 1985, 2113, 2245, 2381, 2521, 2665, 2813, 2965, 3121, 3281, 3445, 3613, 3785, |
| 328 | 3961, 4141, 4325, 4513, 4705, 4901, 5101, 5305, 5513, 5725, 5941, 6161, 6385, |
| 329 | 6613, 6845, 7081, 7321, 7565, 7813, 8065, 8321, 8581, 8845, 9113, 9385, 9661, |
| 330 | 9941, 10225, 10513, 10805, 11101, 11401, 11705, 12013, 12325, 12641, 12961, |
| 331 | 13285, 13613, 13945, 14281, 14621, 14965, 15313, 15665, 16021, 16381, 16745, |
| 332 | 17113, 17485, 17861, 18241, 18625, 19013, 19405, 19801, 20201, 20605, 21013, |
| 333 | 21425, 21841, 22261, 22685, 23113, 23545, 23981, 24421, 24865, 25313, 25765, |
| 334 | 26221, 26681, 27145, 27613, 28085, 28561, 29041, 29525, 30013, 30505, 31001, |
| 335 | 31501, 32005, 32513, 33025, 33541, 34061, 34585, 35113, 35645, 36181, 36721, |
| 336 | 37265, 37813, 38365, 38921, 39481, 40045, 40613, 41185, 41761, 42341, 42925, |
| 337 | 43513, 44105, 44701, 45301, 45905, 46513, 47125, 47741, 48361, 48985, 49613, |
| 338 | 50245, 50881, 51521, 52165, 52813, 53465, 54121, 54781, 55445, 56113, 56785, |
| 339 | 57461, 58141, 58825, 59513, 60205, 60901, 61601, |
| 340 | /* N = 4, K = 4...176 */ |
| 341 | 63, 129, 231, 377, 575, 833, 1159, 1561, 2047, 2625, 3303, 4089, 4991, 6017, |
| 342 | 7175, 8473, 9919, 11521, 13287, 15225, 17343, 19649, 22151, 24857, 27775, |
| 343 | 30913, 34279, 37881, 41727, 45825, 50183, 54809, 59711, 64897, 70375, 76153, |
| 344 | 82239, 88641, 95367, 102425, 109823, 117569, 125671, 134137, 142975, 152193, |
| 345 | 161799, 171801, 182207, 193025, 204263, 215929, 228031, 240577, 253575, |
| 346 | 267033, 280959, 295361, 310247, 325625, 341503, 357889, 374791, 392217, |
| 347 | 410175, 428673, 447719, 467321, 487487, 508225, 529543, 551449, 573951, |
| 348 | 597057, 620775, 645113, 670079, 695681, 721927, 748825, 776383, 804609, |
| 349 | 833511, 863097, 893375, 924353, 956039, 988441, 1021567, 1055425, 1090023, |
| 350 | 1125369, 1161471, 1198337, 1235975, 1274393, 1313599, 1353601, 1394407, |
| 351 | 1436025, 1478463, 1521729, 1565831, 1610777, 1656575, 1703233, 1750759, |
| 352 | 1799161, 1848447, 1898625, 1949703, 2001689, 2054591, 2108417, 2163175, |
| 353 | 2218873, 2275519, 2333121, 2391687, 2451225, 2511743, 2573249, 2635751, |
| 354 | 2699257, 2763775, 2829313, 2895879, 2963481, 3032127, 3101825, 3172583, |
| 355 | 3244409, 3317311, 3391297, 3466375, 3542553, 3619839, 3698241, 3777767, |
| 356 | 3858425, 3940223, 4023169, 4107271, 4192537, 4278975, 4366593, 4455399, |
| 357 | 4545401, 4636607, 4729025, 4822663, 4917529, 5013631, 5110977, 5209575, |
| 358 | 5309433, 5410559, 5512961, 5616647, 5721625, 5827903, 5935489, 6044391, |
| 359 | 6154617, 6266175, 6379073, 6493319, 6608921, 6725887, 6844225, 6963943, |
| 360 | 7085049, 7207551, |
| 361 | /* N = 5, K = 5...176 */ |
| 362 | 321, 681, 1289, 2241, 3649, 5641, 8361, 11969, 16641, 22569, 29961, 39041, |
| 363 | 50049, 63241, 78889, 97281, 118721, 143529, 172041, 204609, 241601, 283401, |
| 364 | 330409, 383041, 441729, 506921, 579081, 658689, 746241, 842249, 947241, |
| 365 | 1061761, 1186369, 1321641, 1468169, 1626561, 1797441, 1981449, 2179241, |
| 366 | 2391489, 2618881, 2862121, 3121929, 3399041, 3694209, 4008201, 4341801, |
| 367 | 4695809, 5071041, 5468329, 5888521, 6332481, 6801089, 7295241, 7815849, |
| 368 | 8363841, 8940161, 9545769, 10181641, 10848769, 11548161, 12280841, 13047849, |
| 369 | 13850241, 14689089, 15565481, 16480521, 17435329, 18431041, 19468809, |
| 370 | 20549801, 21675201, 22846209, 24064041, 25329929, 26645121, 28010881, |
| 371 | 29428489, 30899241, 32424449, 34005441, 35643561, 37340169, 39096641, |
| 372 | 40914369, 42794761, 44739241, 46749249, 48826241, 50971689, 53187081, |
| 373 | 55473921, 57833729, 60268041, 62778409, 65366401, 68033601, 70781609, |
| 374 | 73612041, 76526529, 79526721, 82614281, 85790889, 89058241, 92418049, |
| 375 | 95872041, 99421961, 103069569, 106816641, 110664969, 114616361, 118672641, |
| 376 | 122835649, 127107241, 131489289, 135983681, 140592321, 145317129, 150160041, |
| 377 | 155123009, 160208001, 165417001, 170752009, 176215041, 181808129, 187533321, |
| 378 | 193392681, 199388289, 205522241, 211796649, 218213641, 224775361, 231483969, |
| 379 | 238341641, 245350569, 252512961, 259831041, 267307049, 274943241, 282741889, |
| 380 | 290705281, 298835721, 307135529, 315607041, 324252609, 333074601, 342075401, |
| 381 | 351257409, 360623041, 370174729, 379914921, 389846081, 399970689, 410291241, |
| 382 | 420810249, 431530241, 442453761, 453583369, 464921641, 476471169, 488234561, |
| 383 | 500214441, 512413449, 524834241, 537479489, 550351881, 563454121, 576788929, |
| 384 | 590359041, 604167209, 618216201, 632508801, |
| 385 | /* N = 6, K = 6...96 (technically V(109,5) fits in 32 bits, but that can't be |
| 386 | achieved by splitting an Opus band) */ |
| 387 | 1683, 3653, 7183, 13073, 22363, 36365, 56695, 85305, 124515, 177045, 246047, |
| 388 | 335137, 448427, 590557, 766727, 982729, 1244979, 1560549, 1937199, 2383409, |
| 389 | 2908411, 3522221, 4235671, 5060441, 6009091, 7095093, 8332863, 9737793, |
| 390 | 11326283, 13115773, 15124775, 17372905, 19880915, 22670725, 25765455, |
| 391 | 29189457, 32968347, 37129037, 41699767, 46710137, 52191139, 58175189, |
| 392 | 64696159, 71789409, 79491819, 87841821, 96879431, 106646281, 117185651, |
| 393 | 128542501, 140763503, 153897073, 167993403, 183104493, 199284183, 216588185, |
| 394 | 235074115, 254801525, 275831935, 298228865, 322057867, 347386557, 374284647, |
| 395 | 402823977, 433078547, 465124549, 499040399, 534906769, 572806619, 612825229, |
| 396 | 655050231, 699571641, 746481891, 795875861, 847850911, 902506913, 959946283, |
| 397 | 1020274013, 1083597703, 1150027593, 1219676595, 1292660325, 1369097135, |
| 398 | 1449108145, 1532817275, 1620351277, 1711839767, 1807415257, 1907213187, |
| 399 | 2011371957, 2120032959, |
| 400 | /* N = 7, K = 7...54 (technically V(60,6) fits in 32 bits, but that can't be |
| 401 | achieved by splitting an Opus band) */ |
| 402 | 8989, 19825, 40081, 75517, 134245, 227305, 369305, 579125, 880685, 1303777, |
| 403 | 1884961, 2668525, 3707509, 5064793, 6814249, 9041957, 11847485, 15345233, |
| 404 | 19665841, 24957661, 31388293, 39146185, 48442297, 59511829, 72616013, |
| 405 | 88043969, 106114625, 127178701, 151620757, 179861305, 212358985, 249612805, |
| 406 | 292164445, 340600625, 395555537, 457713341, 527810725, 606639529, 695049433, |
| 407 | 793950709, 904317037, 1027188385, 1163673953, 1314955181, 1482288821, |
| 408 | 1667010073, 1870535785, 2094367717, |
| 409 | /* N = 8, K = 8...37 (technically V(40,7) fits in 32 bits, but that can't be |
| 410 | achieved by splitting an Opus band) */ |
| 411 | 48639, 108545, 224143, 433905, 795455, 1392065, 2340495, 3800305, 5984767, |
| 412 | 9173505, 13726991, 20103025, 28875327, 40754369, 56610575, 77500017, |
| 413 | 104692735, 139703809, 184327311, 240673265, 311207743, 398796225, 506750351, |
| 414 | 638878193, 799538175, 993696769, 1226990095, 1505789553, 1837271615, |
| 415 | 2229491905, |
| 416 | /* N = 9, K = 9...28 (technically V(29,8) fits in 32 bits, but that can't be |
| 417 | achieved by splitting an Opus band) */ |
| 418 | 265729, 598417, 1256465, 2485825, 4673345, 8405905, 14546705, 24331777, |
| 419 | 39490049, 62390545, 96220561, 145198913, 214828609, 312193553, 446304145, |
| 420 | 628496897, 872893441, 1196924561, 1621925137, 2173806145, |
| 421 | /* N = 10, K = 10...24 */ |
| 422 | 1462563, 3317445, 7059735, 14218905, 27298155, 50250765, 89129247, 152951073, |
| 423 | 254831667, 413442773, 654862247, 1014889769, 1541911931, 2300409629, |
| 424 | 3375210671, |
| 425 | /* N = 11, K = 11...19 (technically V(20,10) fits in 32 bits, but that can't be |
| 426 | achieved by splitting an Opus band) */ |
| 427 | 8097453, 18474633, 39753273, 81270333, 158819253, 298199265, 540279585, |
| 428 | 948062325, 1616336765, |
| 429 | /* N = 12, K = 12...18 */ |
| 430 | 45046719, 103274625, 224298231, 464387817, 921406335, 1759885185, |
| 431 | 3248227095, |
| 432 | /* N = 13, K = 13...16 */ |
| 433 | 251595969, 579168825, 1267854873, 2653649025, |
| 434 | /* N = 14, K = 14 */ |
| 435 | 1409933619 |
| 436 | }; |
| 437 | |
| 438 | DECLARE_ALIGNED(32, static const float, celt_window)[120] = { |
| 439 | 6.7286966e-05f, 0.00060551348f, 0.0016815970f, 0.0032947962f, 0.0054439943f, |
| 440 | 0.0081276923f, 0.011344001f, 0.015090633f, 0.019364886f, 0.024163635f, |
| 441 | 0.029483315f, 0.035319905f, 0.041668911f, 0.048525347f, 0.055883718f, |
| 442 | 0.063737999f, 0.072081616f, 0.080907428f, 0.090207705f, 0.099974111f, |
| 443 | 0.11019769f, 0.12086883f, 0.13197729f, 0.14351214f, 0.15546177f, |
| 444 | 0.16781389f, 0.18055550f, 0.19367290f, 0.20715171f, 0.22097682f, |
| 445 | 0.23513243f, 0.24960208f, 0.26436860f, 0.27941419f, 0.29472040f, |
| 446 | 0.31026818f, 0.32603788f, 0.34200931f, 0.35816177f, 0.37447407f, |
| 447 | 0.39092462f, 0.40749142f, 0.42415215f, 0.44088423f, 0.45766484f, |
| 448 | 0.47447104f, 0.49127978f, 0.50806798f, 0.52481261f, 0.54149077f, |
| 449 | 0.55807973f, 0.57455701f, 0.59090049f, 0.60708841f, 0.62309951f, |
| 450 | 0.63891306f, 0.65450896f, 0.66986776f, 0.68497077f, 0.69980010f, |
| 451 | 0.71433873f, 0.72857055f, 0.74248043f, 0.75605424f, 0.76927895f, |
| 452 | 0.78214257f, 0.79463430f, 0.80674445f, 0.81846456f, 0.82978733f, |
| 453 | 0.84070669f, 0.85121779f, 0.86131698f, 0.87100183f, 0.88027111f, |
| 454 | 0.88912479f, 0.89756398f, 0.90559094f, 0.91320904f, 0.92042270f, |
| 455 | 0.92723738f, 0.93365955f, 0.93969656f, 0.94535671f, 0.95064907f, |
| 456 | 0.95558353f, 0.96017067f, 0.96442171f, 0.96834849f, 0.97196334f, |
| 457 | 0.97527906f, 0.97830883f, 0.98106616f, 0.98356480f, 0.98581869f, |
| 458 | 0.98784191f, 0.98964856f, 0.99125274f, 0.99266849f, 0.99390969f, |
| 459 | 0.99499004f, 0.99592297f, 0.99672162f, 0.99739874f, 0.99796667f, |
| 460 | 0.99843728f, 0.99882195f, 0.99913147f, 0.99937606f, 0.99956527f, |
| 461 | 0.99970802f, 0.99981248f, 0.99988613f, 0.99993565f, 0.99996697f, |
| 462 | 0.99998518f, 0.99999457f, 0.99999859f, 0.99999982f, 1.0000000f, |
| 463 | }; |
| 464 | |
| 465 | /* square of the window, used for the postfilter */ |
| 466 | const float ff_celt_window2[120] = { |
| 467 | 4.5275357e-09f, 3.66647e-07f, 2.82777e-06f, 1.08557e-05f, 2.96371e-05f, 6.60594e-05f, |
| 468 | 0.000128686f, 0.000227727f, 0.000374999f, 0.000583881f, 0.000869266f, 0.0012475f, |
| 469 | 0.0017363f, 0.00235471f, 0.00312299f, 0.00406253f, 0.00519576f, 0.00654601f, |
| 470 | 0.00813743f, 0.00999482f, 0.0121435f, 0.0146093f, 0.017418f, 0.0205957f, 0.0241684f, |
| 471 | 0.0281615f, 0.0326003f, 0.0375092f, 0.0429118f, 0.0488308f, 0.0552873f, 0.0623012f, |
| 472 | 0.0698908f, 0.0780723f, 0.0868601f, 0.0962664f, 0.106301f, 0.11697f, 0.12828f, |
| 473 | 0.140231f, 0.152822f, 0.166049f, 0.179905f, 0.194379f, 0.209457f, 0.225123f, 0.241356f, |
| 474 | 0.258133f, 0.275428f, 0.293212f, 0.311453f, 0.330116f, 0.349163f, 0.368556f, 0.388253f, |
| 475 | 0.40821f, 0.428382f, 0.448723f, 0.469185f, 0.48972f, 0.51028f, 0.530815f, 0.551277f, |
| 476 | 0.571618f, 0.59179f, 0.611747f, 0.631444f, 0.650837f, 0.669884f, 0.688547f, 0.706788f, |
| 477 | 0.724572f, 0.741867f, 0.758644f, 0.774877f, 0.790543f, 0.805621f, 0.820095f, 0.833951f, |
| 478 | 0.847178f, 0.859769f, 0.87172f, 0.88303f, 0.893699f, 0.903734f, 0.91314f, 0.921928f, |
| 479 | 0.930109f, 0.937699f, 0.944713f, 0.951169f, 0.957088f, 0.962491f, 0.9674f, 0.971838f, |
| 480 | 0.975832f, 0.979404f, 0.982582f, 0.985391f, 0.987857f, 0.990005f, 0.991863f, 0.993454f, |
| 481 | 0.994804f, 0.995937f, 0.996877f, 0.997645f, 0.998264f, 0.998753f, 0.999131f, 0.999416f, |
| 482 | 0.999625f, 0.999772f, 0.999871f, 0.999934f, 0.99997f, 0.999989f, 0.999997f, 0.99999964f, 1.0f, |
| 483 | }; |
| 484 | |
| 485 | static const uint32_t * const celt_pvq_u_row[15] = { |
| 486 | celt_pvq_u + 0, celt_pvq_u + 176, celt_pvq_u + 351, |
| 487 | celt_pvq_u + 525, celt_pvq_u + 698, celt_pvq_u + 870, |
| 488 | celt_pvq_u + 1041, celt_pvq_u + 1131, celt_pvq_u + 1178, |
| 489 | celt_pvq_u + 1207, celt_pvq_u + 1226, celt_pvq_u + 1240, |
| 490 | celt_pvq_u + 1248, celt_pvq_u + 1254, celt_pvq_u + 1257 |
| 491 | }; |
| 492 | |
| 493 | static inline int16_t celt_cos(int16_t x) |
| 494 | { |
| 495 | x = (MUL16(x, x) + 4096) >> 13; |
| 496 | x = (32767-x) + ROUND_MUL16(x, (-7651 + ROUND_MUL16(x, (8277 + ROUND_MUL16(-626, x))))); |
| 497 | return 1+x; |
| 498 | } |
| 499 | |
| 500 | static inline int celt_log2tan(int isin, int icos) |
| 501 | { |
| 502 | int lc, ls; |
| 503 | lc = opus_ilog(icos); |
| 504 | ls = opus_ilog(isin); |
| 505 | icos <<= 15 - lc; |
| 506 | isin <<= 15 - ls; |
| 507 | return (ls << 11) - (lc << 11) + |
| 508 | ROUND_MUL16(isin, ROUND_MUL16(isin, -2597) + 7932) - |
| 509 | ROUND_MUL16(icos, ROUND_MUL16(icos, -2597) + 7932); |
| 510 | } |
| 511 | |
| 512 | static inline uint32_t celt_rng(CeltContext *s) |
| 513 | { |
| 514 | s->seed = 1664525 * s->seed + 1013904223; |
| 515 | return s->seed; |
| 516 | } |
| 517 | |
| 518 | static void celt_decode_coarse_energy(CeltContext *s, OpusRangeCoder *rc) |
| 519 | { |
| 520 | int i, j; |
| 521 | float prev[2] = {0}; |
| 522 | float alpha, beta; |
| 523 | const uint8_t *model; |
| 524 | |
| 525 | /* use the 2D z-transform to apply prediction in both */ |
| 526 | /* the time domain (alpha) and the frequency domain (beta) */ |
| 527 | |
| 528 | if (opus_rc_tell(rc)+3 <= s->framebits && opus_rc_p2model(rc, 3)) { |
| 529 | /* intra frame */ |
| 530 | alpha = 0; |
| 531 | beta = 1.0f - 4915.0f/32768.0f; |
| 532 | model = celt_coarse_energy_dist[s->duration][1]; |
| 533 | } else { |
| 534 | alpha = celt_alpha_coef[s->duration]; |
| 535 | beta = 1.0f - celt_beta_coef[s->duration]; |
| 536 | model = celt_coarse_energy_dist[s->duration][0]; |
| 537 | } |
| 538 | |
| 539 | for (i = 0; i < CELT_MAX_BANDS; i++) { |
| 540 | for (j = 0; j < s->coded_channels; j++) { |
| 541 | CeltFrame *frame = &s->frame[j]; |
| 542 | float value; |
| 543 | int available; |
| 544 | |
| 545 | if (i < s->startband || i >= s->endband) { |
| 546 | frame->energy[i] = 0.0; |
| 547 | continue; |
| 548 | } |
| 549 | |
| 550 | available = s->framebits - opus_rc_tell(rc); |
| 551 | if (available >= 15) { |
| 552 | /* decode using a Laplace distribution */ |
| 553 | int k = FFMIN(i, 20) << 1; |
| 554 | value = opus_rc_laplace(rc, model[k] << 7, model[k+1] << 6); |
| 555 | } else if (available >= 2) { |
| 556 | int x = opus_rc_getsymbol(rc, celt_model_energy_small); |
| 557 | value = (x>>1) ^ -(x&1); |
| 558 | } else if (available >= 1) { |
| 559 | value = -(float)opus_rc_p2model(rc, 1); |
| 560 | } else value = -1; |
| 561 | |
| 562 | frame->energy[i] = FFMAX(-9.0f, frame->energy[i]) * alpha + prev[j] + value; |
| 563 | prev[j] += beta * value; |
| 564 | } |
| 565 | } |
| 566 | } |
| 567 | |
| 568 | static void celt_decode_fine_energy(CeltContext *s, OpusRangeCoder *rc) |
| 569 | { |
| 570 | int i; |
| 571 | for (i = s->startband; i < s->endband; i++) { |
| 572 | int j; |
| 573 | if (!s->fine_bits[i]) |
| 574 | continue; |
| 575 | |
| 576 | for (j = 0; j < s->coded_channels; j++) { |
| 577 | CeltFrame *frame = &s->frame[j]; |
| 578 | int q2; |
| 579 | float offset; |
| 580 | q2 = opus_getrawbits(rc, s->fine_bits[i]); |
| 581 | offset = (q2 + 0.5f) * (1 << (14 - s->fine_bits[i])) / 16384.0f - 0.5f; |
| 582 | frame->energy[i] += offset; |
| 583 | } |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | static void celt_decode_final_energy(CeltContext *s, OpusRangeCoder *rc, |
| 588 | int bits_left) |
| 589 | { |
| 590 | int priority, i, j; |
| 591 | |
| 592 | for (priority = 0; priority < 2; priority++) { |
| 593 | for (i = s->startband; i < s->endband && bits_left >= s->coded_channels; i++) { |
| 594 | if (s->fine_priority[i] != priority || s->fine_bits[i] >= CELT_MAX_FINE_BITS) |
| 595 | continue; |
| 596 | |
| 597 | for (j = 0; j < s->coded_channels; j++) { |
| 598 | int q2; |
| 599 | float offset; |
| 600 | q2 = opus_getrawbits(rc, 1); |
| 601 | offset = (q2 - 0.5f) * (1 << (14 - s->fine_bits[i] - 1)) / 16384.0f; |
| 602 | s->frame[j].energy[i] += offset; |
| 603 | bits_left--; |
| 604 | } |
| 605 | } |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | static void celt_decode_tf_changes(CeltContext *s, OpusRangeCoder *rc, |
| 610 | int transient) |
| 611 | { |
| 612 | int i, diff = 0, tf_select = 0, tf_changed = 0, tf_select_bit; |
| 613 | int consumed, bits = transient ? 2 : 4; |
| 614 | |
| 615 | consumed = opus_rc_tell(rc); |
| 616 | tf_select_bit = (s->duration != 0 && consumed+bits+1 <= s->framebits); |
| 617 | |
| 618 | for (i = s->startband; i < s->endband; i++) { |
| 619 | if (consumed+bits+tf_select_bit <= s->framebits) { |
| 620 | diff ^= opus_rc_p2model(rc, bits); |
| 621 | consumed = opus_rc_tell(rc); |
| 622 | tf_changed |= diff; |
| 623 | } |
| 624 | s->tf_change[i] = diff; |
| 625 | bits = transient ? 4 : 5; |
| 626 | } |
| 627 | |
| 628 | if (tf_select_bit && celt_tf_select[s->duration][transient][0][tf_changed] != |
| 629 | celt_tf_select[s->duration][transient][1][tf_changed]) |
| 630 | tf_select = opus_rc_p2model(rc, 1); |
| 631 | |
| 632 | for (i = s->startband; i < s->endband; i++) { |
| 633 | s->tf_change[i] = celt_tf_select[s->duration][transient][tf_select][s->tf_change[i]]; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | static void celt_decode_allocation(CeltContext *s, OpusRangeCoder *rc) |
| 638 | { |
| 639 | // approx. maximum bit allocation for each band before boost/trim |
| 640 | int cap[CELT_MAX_BANDS]; |
| 641 | int boost[CELT_MAX_BANDS]; |
| 642 | int threshold[CELT_MAX_BANDS]; |
| 643 | int bits1[CELT_MAX_BANDS]; |
| 644 | int bits2[CELT_MAX_BANDS]; |
| 645 | int trim_offset[CELT_MAX_BANDS]; |
| 646 | |
| 647 | int skip_startband = s->startband; |
| 648 | int dynalloc = 6; |
| 649 | int alloctrim = 5; |
| 650 | int extrabits = 0; |
| 651 | |
| 652 | int skip_bit = 0; |
| 653 | int intensitystereo_bit = 0; |
| 654 | int dualstereo_bit = 0; |
| 655 | |
| 656 | int remaining, bandbits; |
| 657 | int low, high, total, done; |
| 658 | int totalbits; |
| 659 | int consumed; |
| 660 | int i, j; |
| 661 | |
| 662 | consumed = opus_rc_tell(rc); |
| 663 | |
| 664 | /* obtain spread flag */ |
| 665 | s->spread = CELT_SPREAD_NORMAL; |
| 666 | if (consumed + 4 <= s->framebits) |
| 667 | s->spread = opus_rc_getsymbol(rc, celt_model_spread); |
| 668 | |
| 669 | /* generate static allocation caps */ |
| 670 | for (i = 0; i < CELT_MAX_BANDS; i++) { |
| 671 | cap[i] = (celt_static_caps[s->duration][s->coded_channels - 1][i] + 64) |
| 672 | * celt_freq_range[i] << (s->coded_channels - 1) << s->duration >> 2; |
| 673 | } |
| 674 | |
| 675 | /* obtain band boost */ |
| 676 | totalbits = s->framebits << 3; // convert to 1/8 bits |
| 677 | consumed = opus_rc_tell_frac(rc); |
| 678 | for (i = s->startband; i < s->endband; i++) { |
| 679 | int quanta, band_dynalloc; |
| 680 | |
| 681 | boost[i] = 0; |
| 682 | |
| 683 | quanta = celt_freq_range[i] << (s->coded_channels - 1) << s->duration; |
| 684 | quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta)); |
| 685 | band_dynalloc = dynalloc; |
| 686 | while (consumed + (band_dynalloc<<3) < totalbits && boost[i] < cap[i]) { |
| 687 | int add = opus_rc_p2model(rc, band_dynalloc); |
| 688 | consumed = opus_rc_tell_frac(rc); |
| 689 | if (!add) |
| 690 | break; |
| 691 | |
| 692 | boost[i] += quanta; |
| 693 | totalbits -= quanta; |
| 694 | band_dynalloc = 1; |
| 695 | } |
| 696 | /* dynalloc is more likely to occur if it's already been used for earlier bands */ |
| 697 | if (boost[i]) |
| 698 | dynalloc = FFMAX(2, dynalloc - 1); |
| 699 | } |
| 700 | |
| 701 | /* obtain allocation trim */ |
| 702 | if (consumed + (6 << 3) <= totalbits) |
| 703 | alloctrim = opus_rc_getsymbol(rc, celt_model_alloc_trim); |
| 704 | |
| 705 | /* anti-collapse bit reservation */ |
| 706 | totalbits = (s->framebits << 3) - opus_rc_tell_frac(rc) - 1; |
| 707 | s->anticollapse_bit = 0; |
| 708 | if (s->blocks > 1 && s->duration >= 2 && |
| 709 | totalbits >= ((s->duration + 2) << 3)) |
| 710 | s->anticollapse_bit = 1 << 3; |
| 711 | totalbits -= s->anticollapse_bit; |
| 712 | |
| 713 | /* band skip bit reservation */ |
| 714 | if (totalbits >= 1 << 3) |
| 715 | skip_bit = 1 << 3; |
| 716 | totalbits -= skip_bit; |
| 717 | |
| 718 | /* intensity/dual stereo bit reservation */ |
| 719 | if (s->coded_channels == 2) { |
| 720 | intensitystereo_bit = celt_log2_frac[s->endband - s->startband]; |
| 721 | if (intensitystereo_bit <= totalbits) { |
| 722 | totalbits -= intensitystereo_bit; |
| 723 | if (totalbits >= 1 << 3) { |
| 724 | dualstereo_bit = 1 << 3; |
| 725 | totalbits -= 1 << 3; |
| 726 | } |
| 727 | } else |
| 728 | intensitystereo_bit = 0; |
| 729 | } |
| 730 | |
| 731 | for (i = s->startband; i < s->endband; i++) { |
| 732 | int trim = alloctrim - 5 - s->duration; |
| 733 | int band = celt_freq_range[i] * (s->endband - i - 1); |
| 734 | int duration = s->duration + 3; |
| 735 | int scale = duration + s->coded_channels - 1; |
| 736 | |
| 737 | /* PVQ minimum allocation threshold, below this value the band is |
| 738 | * skipped */ |
| 739 | threshold[i] = FFMAX(3 * celt_freq_range[i] << duration >> 4, |
| 740 | s->coded_channels << 3); |
| 741 | |
| 742 | trim_offset[i] = trim * (band << scale) >> 6; |
| 743 | |
| 744 | if (celt_freq_range[i] << s->duration == 1) |
| 745 | trim_offset[i] -= s->coded_channels << 3; |
| 746 | } |
| 747 | |
| 748 | /* bisection */ |
| 749 | low = 1; |
| 750 | high = CELT_VECTORS - 1; |
| 751 | while (low <= high) { |
| 752 | int center = (low + high) >> 1; |
| 753 | done = total = 0; |
| 754 | |
| 755 | for (i = s->endband - 1; i >= s->startband; i--) { |
| 756 | bandbits = celt_freq_range[i] * celt_static_alloc[center][i] |
| 757 | << (s->coded_channels - 1) << s->duration >> 2; |
| 758 | |
| 759 | if (bandbits) |
| 760 | bandbits = FFMAX(0, bandbits + trim_offset[i]); |
| 761 | bandbits += boost[i]; |
| 762 | |
| 763 | if (bandbits >= threshold[i] || done) { |
| 764 | done = 1; |
| 765 | total += FFMIN(bandbits, cap[i]); |
| 766 | } else if (bandbits >= s->coded_channels << 3) |
| 767 | total += s->coded_channels << 3; |
| 768 | } |
| 769 | |
| 770 | if (total > totalbits) |
| 771 | high = center - 1; |
| 772 | else |
| 773 | low = center + 1; |
| 774 | } |
| 775 | high = low--; |
| 776 | |
| 777 | for (i = s->startband; i < s->endband; i++) { |
| 778 | bits1[i] = celt_freq_range[i] * celt_static_alloc[low][i] |
| 779 | << (s->coded_channels - 1) << s->duration >> 2; |
| 780 | bits2[i] = high >= CELT_VECTORS ? cap[i] : |
| 781 | celt_freq_range[i] * celt_static_alloc[high][i] |
| 782 | << (s->coded_channels - 1) << s->duration >> 2; |
| 783 | |
| 784 | if (bits1[i]) |
| 785 | bits1[i] = FFMAX(0, bits1[i] + trim_offset[i]); |
| 786 | if (bits2[i]) |
| 787 | bits2[i] = FFMAX(0, bits2[i] + trim_offset[i]); |
| 788 | if (low) |
| 789 | bits1[i] += boost[i]; |
| 790 | bits2[i] += boost[i]; |
| 791 | |
| 792 | if (boost[i]) |
| 793 | skip_startband = i; |
| 794 | bits2[i] = FFMAX(0, bits2[i] - bits1[i]); |
| 795 | } |
| 796 | |
| 797 | /* bisection */ |
| 798 | low = 0; |
| 799 | high = 1 << CELT_ALLOC_STEPS; |
| 800 | for (i = 0; i < CELT_ALLOC_STEPS; i++) { |
| 801 | int center = (low + high) >> 1; |
| 802 | done = total = 0; |
| 803 | |
| 804 | for (j = s->endband - 1; j >= s->startband; j--) { |
| 805 | bandbits = bits1[j] + (center * bits2[j] >> CELT_ALLOC_STEPS); |
| 806 | |
| 807 | if (bandbits >= threshold[j] || done) { |
| 808 | done = 1; |
| 809 | total += FFMIN(bandbits, cap[j]); |
| 810 | } else if (bandbits >= s->coded_channels << 3) |
| 811 | total += s->coded_channels << 3; |
| 812 | } |
| 813 | if (total > totalbits) |
| 814 | high = center; |
| 815 | else |
| 816 | low = center; |
| 817 | } |
| 818 | |
| 819 | done = total = 0; |
| 820 | for (i = s->endband - 1; i >= s->startband; i--) { |
| 821 | bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS); |
| 822 | |
| 823 | if (bandbits >= threshold[i] || done) |
| 824 | done = 1; |
| 825 | else |
| 826 | bandbits = (bandbits >= s->coded_channels << 3) ? |
| 827 | s->coded_channels << 3 : 0; |
| 828 | |
| 829 | bandbits = FFMIN(bandbits, cap[i]); |
| 830 | s->pulses[i] = bandbits; |
| 831 | total += bandbits; |
| 832 | } |
| 833 | |
| 834 | /* band skipping */ |
| 835 | for (s->codedbands = s->endband; ; s->codedbands--) { |
| 836 | int allocation; |
| 837 | j = s->codedbands - 1; |
| 838 | |
| 839 | if (j == skip_startband) { |
| 840 | /* all remaining bands are not skipped */ |
| 841 | totalbits += skip_bit; |
| 842 | break; |
| 843 | } |
| 844 | |
| 845 | /* determine the number of bits available for coding "do not skip" markers */ |
| 846 | remaining = totalbits - total; |
| 847 | bandbits = remaining / (celt_freq_bands[j+1] - celt_freq_bands[s->startband]); |
| 848 | remaining -= bandbits * (celt_freq_bands[j+1] - celt_freq_bands[s->startband]); |
| 849 | allocation = s->pulses[j] + bandbits * celt_freq_range[j] |
| 850 | + FFMAX(0, remaining - (celt_freq_bands[j] - celt_freq_bands[s->startband])); |
| 851 | |
| 852 | /* a "do not skip" marker is only coded if the allocation is |
| 853 | above the chosen threshold */ |
| 854 | if (allocation >= FFMAX(threshold[j], (s->coded_channels + 1) <<3 )) { |
| 855 | if (opus_rc_p2model(rc, 1)) |
| 856 | break; |
| 857 | |
| 858 | total += 1 << 3; |
| 859 | allocation -= 1 << 3; |
| 860 | } |
| 861 | |
| 862 | /* the band is skipped, so reclaim its bits */ |
| 863 | total -= s->pulses[j]; |
| 864 | if (intensitystereo_bit) { |
| 865 | total -= intensitystereo_bit; |
| 866 | intensitystereo_bit = celt_log2_frac[j - s->startband]; |
| 867 | total += intensitystereo_bit; |
| 868 | } |
| 869 | |
| 870 | total += s->pulses[j] = (allocation >= s->coded_channels << 3) ? |
| 871 | s->coded_channels << 3 : 0; |
| 872 | } |
| 873 | |
| 874 | /* obtain stereo flags */ |
| 875 | s->intensitystereo = 0; |
| 876 | s->dualstereo = 0; |
| 877 | if (intensitystereo_bit) |
| 878 | s->intensitystereo = s->startband + |
| 879 | opus_rc_unimodel(rc, s->codedbands + 1 - s->startband); |
| 880 | if (s->intensitystereo <= s->startband) |
| 881 | totalbits += dualstereo_bit; /* no intensity stereo means no dual stereo */ |
| 882 | else if (dualstereo_bit) |
| 883 | s->dualstereo = opus_rc_p2model(rc, 1); |
| 884 | |
| 885 | /* supply the remaining bits in this frame to lower bands */ |
| 886 | remaining = totalbits - total; |
| 887 | bandbits = remaining / (celt_freq_bands[s->codedbands] - celt_freq_bands[s->startband]); |
| 888 | remaining -= bandbits * (celt_freq_bands[s->codedbands] - celt_freq_bands[s->startband]); |
| 889 | for (i = s->startband; i < s->codedbands; i++) { |
| 890 | int bits = FFMIN(remaining, celt_freq_range[i]); |
| 891 | |
| 892 | s->pulses[i] += bits + bandbits * celt_freq_range[i]; |
| 893 | remaining -= bits; |
| 894 | } |
| 895 | |
| 896 | for (i = s->startband; i < s->codedbands; i++) { |
| 897 | int N = celt_freq_range[i] << s->duration; |
| 898 | int prev_extra = extrabits; |
| 899 | s->pulses[i] += extrabits; |
| 900 | |
| 901 | if (N > 1) { |
| 902 | int dof; // degrees of freedom |
| 903 | int temp; // dof * channels * log(dof) |
| 904 | int offset; // fine energy quantization offset, i.e. |
| 905 | // extra bits assigned over the standard |
| 906 | // totalbits/dof |
| 907 | int fine_bits, max_bits; |
| 908 | |
| 909 | extrabits = FFMAX(0, s->pulses[i] - cap[i]); |
| 910 | s->pulses[i] -= extrabits; |
| 911 | |
| 912 | /* intensity stereo makes use of an extra degree of freedom */ |
| 913 | dof = N * s->coded_channels |
| 914 | + (s->coded_channels == 2 && N > 2 && !s->dualstereo && i < s->intensitystereo); |
| 915 | temp = dof * (celt_log_freq_range[i] + (s->duration<<3)); |
| 916 | offset = (temp >> 1) - dof * CELT_FINE_OFFSET; |
| 917 | if (N == 2) /* dof=2 is the only case that doesn't fit the model */ |
| 918 | offset += dof<<1; |
| 919 | |
| 920 | /* grant an additional bias for the first and second pulses */ |
| 921 | if (s->pulses[i] + offset < 2 * (dof << 3)) |
| 922 | offset += temp >> 2; |
| 923 | else if (s->pulses[i] + offset < 3 * (dof << 3)) |
| 924 | offset += temp >> 3; |
| 925 | |
| 926 | fine_bits = (s->pulses[i] + offset + (dof << 2)) / (dof << 3); |
| 927 | max_bits = FFMIN((s->pulses[i]>>3) >> (s->coded_channels - 1), |
| 928 | CELT_MAX_FINE_BITS); |
| 929 | |
| 930 | max_bits = FFMAX(max_bits, 0); |
| 931 | |
| 932 | s->fine_bits[i] = av_clip(fine_bits, 0, max_bits); |
| 933 | |
| 934 | /* if fine_bits was rounded down or capped, |
| 935 | give priority for the final fine energy pass */ |
| 936 | s->fine_priority[i] = (s->fine_bits[i] * (dof<<3) >= s->pulses[i] + offset); |
| 937 | |
| 938 | /* the remaining bits are assigned to PVQ */ |
| 939 | s->pulses[i] -= s->fine_bits[i] << (s->coded_channels - 1) << 3; |
| 940 | } else { |
| 941 | /* all bits go to fine energy except for the sign bit */ |
| 942 | extrabits = FFMAX(0, s->pulses[i] - (s->coded_channels << 3)); |
| 943 | s->pulses[i] -= extrabits; |
| 944 | s->fine_bits[i] = 0; |
| 945 | s->fine_priority[i] = 1; |
| 946 | } |
| 947 | |
| 948 | /* hand back a limited number of extra fine energy bits to this band */ |
| 949 | if (extrabits > 0) { |
| 950 | int fineextra = FFMIN(extrabits >> (s->coded_channels + 2), |
| 951 | CELT_MAX_FINE_BITS - s->fine_bits[i]); |
| 952 | s->fine_bits[i] += fineextra; |
| 953 | |
| 954 | fineextra <<= s->coded_channels + 2; |
| 955 | s->fine_priority[i] = (fineextra >= extrabits - prev_extra); |
| 956 | extrabits -= fineextra; |
| 957 | } |
| 958 | } |
| 959 | s->remaining = extrabits; |
| 960 | |
| 961 | /* skipped bands dedicate all of their bits for fine energy */ |
| 962 | for (; i < s->endband; i++) { |
| 963 | s->fine_bits[i] = s->pulses[i] >> (s->coded_channels - 1) >> 3; |
| 964 | s->pulses[i] = 0; |
| 965 | s->fine_priority[i] = s->fine_bits[i] < 1; |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | static inline int celt_bits2pulses(const uint8_t *cache, int bits) |
| 970 | { |
| 971 | // TODO: Find the size of cache and make it into an array in the parameters list |
| 972 | int i, low = 0, high; |
| 973 | |
| 974 | high = cache[0]; |
| 975 | bits--; |
| 976 | |
| 977 | for (i = 0; i < 6; i++) { |
| 978 | int center = (low + high + 1) >> 1; |
| 979 | if (cache[center] >= bits) |
| 980 | high = center; |
| 981 | else |
| 982 | low = center; |
| 983 | } |
| 984 | |
| 985 | return (bits - (low == 0 ? -1 : cache[low]) <= cache[high] - bits) ? low : high; |
| 986 | } |
| 987 | |
| 988 | static inline int celt_pulses2bits(const uint8_t *cache, int pulses) |
| 989 | { |
| 990 | // TODO: Find the size of cache and make it into an array in the parameters list |
| 991 | return (pulses == 0) ? 0 : cache[pulses] + 1; |
| 992 | } |
| 993 | |
| 994 | static inline void celt_normalize_residual(const int * av_restrict iy, float * av_restrict X, |
| 995 | int N, float g) |
| 996 | { |
| 997 | int i; |
| 998 | for (i = 0; i < N; i++) |
| 999 | X[i] = g * iy[i]; |
| 1000 | } |
| 1001 | |
| 1002 | static void celt_exp_rotation1(float *X, unsigned int len, unsigned int stride, |
| 1003 | float c, float s) |
| 1004 | { |
| 1005 | float *Xptr; |
| 1006 | int i; |
| 1007 | |
| 1008 | Xptr = X; |
| 1009 | for (i = 0; i < len - stride; i++) { |
| 1010 | float x1, x2; |
| 1011 | x1 = Xptr[0]; |
| 1012 | x2 = Xptr[stride]; |
| 1013 | Xptr[stride] = c * x2 + s * x1; |
| 1014 | *Xptr++ = c * x1 - s * x2; |
| 1015 | } |
| 1016 | |
| 1017 | Xptr = &X[len - 2 * stride - 1]; |
| 1018 | for (i = len - 2 * stride - 1; i >= 0; i--) { |
| 1019 | float x1, x2; |
| 1020 | x1 = Xptr[0]; |
| 1021 | x2 = Xptr[stride]; |
| 1022 | Xptr[stride] = c * x2 + s * x1; |
| 1023 | *Xptr-- = c * x1 - s * x2; |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | static inline void celt_exp_rotation(float *X, unsigned int len, |
| 1028 | unsigned int stride, unsigned int K, |
| 1029 | enum CeltSpread spread) |
| 1030 | { |
| 1031 | unsigned int stride2 = 0; |
| 1032 | float c, s; |
| 1033 | float gain, theta; |
| 1034 | int i; |
| 1035 | |
| 1036 | if (2*K >= len || spread == CELT_SPREAD_NONE) |
| 1037 | return; |
| 1038 | |
| 1039 | gain = (float)len / (len + (20 - 5*spread) * K); |
| 1040 | theta = M_PI * gain * gain / 4; |
| 1041 | |
| 1042 | c = cos(theta); |
| 1043 | s = sin(theta); |
| 1044 | |
| 1045 | if (len >= stride << 3) { |
| 1046 | stride2 = 1; |
| 1047 | /* This is just a simple (equivalent) way of computing sqrt(len/stride) with rounding. |
| 1048 | It's basically incrementing long as (stride2+0.5)^2 < len/stride. */ |
| 1049 | while ((stride2 * stride2 + stride2) * stride + (stride >> 2) < len) |
| 1050 | stride2++; |
| 1051 | } |
| 1052 | |
| 1053 | /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for |
| 1054 | extract_collapse_mask().*/ |
| 1055 | len /= stride; |
| 1056 | for (i = 0; i < stride; i++) { |
| 1057 | if (stride2) |
| 1058 | celt_exp_rotation1(X + i * len, len, stride2, s, c); |
| 1059 | celt_exp_rotation1(X + i * len, len, 1, c, s); |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | static inline unsigned int celt_extract_collapse_mask(const int *iy, |
| 1064 | unsigned int N, |
| 1065 | unsigned int B) |
| 1066 | { |
| 1067 | unsigned int collapse_mask; |
| 1068 | int N0; |
| 1069 | int i, j; |
| 1070 | |
| 1071 | if (B <= 1) |
| 1072 | return 1; |
| 1073 | |
| 1074 | /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for |
| 1075 | exp_rotation().*/ |
| 1076 | N0 = N/B; |
| 1077 | collapse_mask = 0; |
| 1078 | for (i = 0; i < B; i++) |
| 1079 | for (j = 0; j < N0; j++) |
| 1080 | collapse_mask |= (iy[i*N0+j]!=0)<<i; |
| 1081 | return collapse_mask; |
| 1082 | } |
| 1083 | |
| 1084 | static inline void celt_renormalize_vector(float *X, int N, float gain) |
| 1085 | { |
| 1086 | int i; |
| 1087 | float g = 1e-15f; |
| 1088 | for (i = 0; i < N; i++) |
| 1089 | g += X[i] * X[i]; |
| 1090 | g = gain / sqrtf(g); |
| 1091 | |
| 1092 | for (i = 0; i < N; i++) |
| 1093 | X[i] *= g; |
| 1094 | } |
| 1095 | |
| 1096 | static inline void celt_stereo_merge(float *X, float *Y, float mid, int N) |
| 1097 | { |
| 1098 | int i; |
| 1099 | float xp = 0, side = 0; |
| 1100 | float E[2]; |
| 1101 | float mid2; |
| 1102 | float t, gain[2]; |
| 1103 | |
| 1104 | /* Compute the norm of X+Y and X-Y as |X|^2 + |Y|^2 +/- sum(xy) */ |
| 1105 | for (i = 0; i < N; i++) { |
| 1106 | xp += X[i] * Y[i]; |
| 1107 | side += Y[i] * Y[i]; |
| 1108 | } |
| 1109 | |
| 1110 | /* Compensating for the mid normalization */ |
| 1111 | xp *= mid; |
| 1112 | mid2 = mid; |
| 1113 | E[0] = mid2 * mid2 + side - 2 * xp; |
| 1114 | E[1] = mid2 * mid2 + side + 2 * xp; |
| 1115 | if (E[0] < 6e-4f || E[1] < 6e-4f) { |
| 1116 | for (i = 0; i < N; i++) |
| 1117 | Y[i] = X[i]; |
| 1118 | return; |
| 1119 | } |
| 1120 | |
| 1121 | t = E[0]; |
| 1122 | gain[0] = 1.0f / sqrtf(t); |
| 1123 | t = E[1]; |
| 1124 | gain[1] = 1.0f / sqrtf(t); |
| 1125 | |
| 1126 | for (i = 0; i < N; i++) { |
| 1127 | float value[2]; |
| 1128 | /* Apply mid scaling (side is already scaled) */ |
| 1129 | value[0] = mid * X[i]; |
| 1130 | value[1] = Y[i]; |
| 1131 | X[i] = gain[0] * (value[0] - value[1]); |
| 1132 | Y[i] = gain[1] * (value[0] + value[1]); |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | static void celt_interleave_hadamard(float *tmp, float *X, int N0, |
| 1137 | int stride, int hadamard) |
| 1138 | { |
| 1139 | int i, j; |
| 1140 | int N = N0*stride; |
| 1141 | |
| 1142 | if (hadamard) { |
| 1143 | const uint8_t *ordery = celt_hadamard_ordery + stride - 2; |
| 1144 | for (i = 0; i < stride; i++) |
| 1145 | for (j = 0; j < N0; j++) |
| 1146 | tmp[j*stride+i] = X[ordery[i]*N0+j]; |
| 1147 | } else { |
| 1148 | for (i = 0; i < stride; i++) |
| 1149 | for (j = 0; j < N0; j++) |
| 1150 | tmp[j*stride+i] = X[i*N0+j]; |
| 1151 | } |
| 1152 | |
| 1153 | for (i = 0; i < N; i++) |
| 1154 | X[i] = tmp[i]; |
| 1155 | } |
| 1156 | |
| 1157 | static void celt_deinterleave_hadamard(float *tmp, float *X, int N0, |
| 1158 | int stride, int hadamard) |
| 1159 | { |
| 1160 | int i, j; |
| 1161 | int N = N0*stride; |
| 1162 | |
| 1163 | if (hadamard) { |
| 1164 | const uint8_t *ordery = celt_hadamard_ordery + stride - 2; |
| 1165 | for (i = 0; i < stride; i++) |
| 1166 | for (j = 0; j < N0; j++) |
| 1167 | tmp[ordery[i]*N0+j] = X[j*stride+i]; |
| 1168 | } else { |
| 1169 | for (i = 0; i < stride; i++) |
| 1170 | for (j = 0; j < N0; j++) |
| 1171 | tmp[i*N0+j] = X[j*stride+i]; |
| 1172 | } |
| 1173 | |
| 1174 | for (i = 0; i < N; i++) |
| 1175 | X[i] = tmp[i]; |
| 1176 | } |
| 1177 | |
| 1178 | static void celt_haar1(float *X, int N0, int stride) |
| 1179 | { |
| 1180 | int i, j; |
| 1181 | N0 >>= 1; |
| 1182 | for (i = 0; i < stride; i++) { |
| 1183 | for (j = 0; j < N0; j++) { |
| 1184 | float x0 = X[stride * (2 * j + 0) + i]; |
| 1185 | float x1 = X[stride * (2 * j + 1) + i]; |
| 1186 | X[stride * (2 * j + 0) + i] = (x0 + x1) * M_SQRT1_2; |
| 1187 | X[stride * (2 * j + 1) + i] = (x0 - x1) * M_SQRT1_2; |
| 1188 | } |
| 1189 | } |
| 1190 | } |
| 1191 | |
| 1192 | static inline int celt_compute_qn(int N, int b, int offset, int pulse_cap, |
| 1193 | int dualstereo) |
| 1194 | { |
| 1195 | int qn, qb; |
| 1196 | int N2 = 2 * N - 1; |
| 1197 | if (dualstereo && N == 2) |
| 1198 | N2--; |
| 1199 | |
| 1200 | /* The upper limit ensures that in a stereo split with itheta==16384, we'll |
| 1201 | * always have enough bits left over to code at least one pulse in the |
| 1202 | * side; otherwise it would collapse, since it doesn't get folded. */ |
| 1203 | qb = FFMIN3(b - pulse_cap - (4 << 3), (b + N2 * offset) / N2, 8 << 3); |
| 1204 | qn = (qb < (1 << 3 >> 1)) ? 1 : ((celt_qn_exp2[qb & 0x7] >> (14 - (qb >> 3))) + 1) >> 1 << 1; |
| 1205 | return qn; |
| 1206 | } |
| 1207 | |
| 1208 | // this code was adapted from libopus |
| 1209 | static inline uint64_t celt_cwrsi(unsigned int N, unsigned int K, unsigned int i, int *y) |
| 1210 | { |
| 1211 | uint64_t norm = 0; |
| 1212 | uint32_t p; |
| 1213 | int s, val; |
| 1214 | int k0; |
| 1215 | |
| 1216 | while (N > 2) { |
| 1217 | uint32_t q; |
| 1218 | |
| 1219 | /*Lots of pulses case:*/ |
| 1220 | if (K >= N) { |
| 1221 | const uint32_t *row = celt_pvq_u_row[N]; |
| 1222 | |
| 1223 | /* Are the pulses in this dimension negative? */ |
| 1224 | p = row[K + 1]; |
| 1225 | s = -(i >= p); |
| 1226 | i -= p & s; |
| 1227 | |
| 1228 | /*Count how many pulses were placed in this dimension.*/ |
| 1229 | k0 = K; |
| 1230 | q = row[N]; |
| 1231 | if (q > i) { |
| 1232 | K = N; |
| 1233 | do { |
| 1234 | p = celt_pvq_u_row[--K][N]; |
| 1235 | } while (p > i); |
| 1236 | } else |
| 1237 | for (p = row[K]; p > i; p = row[K]) |
| 1238 | K--; |
| 1239 | |
| 1240 | i -= p; |
| 1241 | val = (k0 - K + s) ^ s; |
| 1242 | norm += val * val; |
| 1243 | *y++ = val; |
| 1244 | } else { /*Lots of dimensions case:*/ |
| 1245 | /*Are there any pulses in this dimension at all?*/ |
| 1246 | p = celt_pvq_u_row[K ][N]; |
| 1247 | q = celt_pvq_u_row[K + 1][N]; |
| 1248 | |
| 1249 | if (p <= i && i < q) { |
| 1250 | i -= p; |
| 1251 | *y++ = 0; |
| 1252 | } else { |
| 1253 | /*Are the pulses in this dimension negative?*/ |
| 1254 | s = -(i >= q); |
| 1255 | i -= q & s; |
| 1256 | |
| 1257 | /*Count how many pulses were placed in this dimension.*/ |
| 1258 | k0 = K; |
| 1259 | do p = celt_pvq_u_row[--K][N]; |
| 1260 | while (p > i); |
| 1261 | |
| 1262 | i -= p; |
| 1263 | val = (k0 - K + s) ^ s; |
| 1264 | norm += val * val; |
| 1265 | *y++ = val; |
| 1266 | } |
| 1267 | } |
| 1268 | N--; |
| 1269 | } |
| 1270 | |
| 1271 | /* N == 2 */ |
| 1272 | p = 2 * K + 1; |
| 1273 | s = -(i >= p); |
| 1274 | i -= p & s; |
| 1275 | k0 = K; |
| 1276 | K = (i + 1) / 2; |
| 1277 | |
| 1278 | if (K) |
| 1279 | i -= 2 * K - 1; |
| 1280 | |
| 1281 | val = (k0 - K + s) ^ s; |
| 1282 | norm += val * val; |
| 1283 | *y++ = val; |
| 1284 | |
| 1285 | /* N==1 */ |
| 1286 | s = -i; |
| 1287 | val = (K + s) ^ s; |
| 1288 | norm += val * val; |
| 1289 | *y = val; |
| 1290 | |
| 1291 | return norm; |
| 1292 | } |
| 1293 | |
| 1294 | static inline float celt_decode_pulses(OpusRangeCoder *rc, int *y, unsigned int N, unsigned int K) |
| 1295 | { |
| 1296 | unsigned int idx; |
| 1297 | #define CELT_PVQ_U(n, k) (celt_pvq_u_row[FFMIN(n, k)][FFMAX(n, k)]) |
| 1298 | #define CELT_PVQ_V(n, k) (CELT_PVQ_U(n, k) + CELT_PVQ_U(n, (k) + 1)) |
| 1299 | idx = opus_rc_unimodel(rc, CELT_PVQ_V(N, K)); |
| 1300 | return celt_cwrsi(N, K, idx, y); |
| 1301 | } |
| 1302 | |
| 1303 | /** Decode pulse vector and combine the result with the pitch vector to produce |
| 1304 | the final normalised signal in the current band. */ |
| 1305 | static inline unsigned int celt_alg_unquant(OpusRangeCoder *rc, float *X, |
| 1306 | unsigned int N, unsigned int K, |
| 1307 | enum CeltSpread spread, |
| 1308 | unsigned int blocks, float gain) |
| 1309 | { |
| 1310 | int y[176]; |
| 1311 | |
| 1312 | gain /= sqrtf(celt_decode_pulses(rc, y, N, K)); |
| 1313 | celt_normalize_residual(y, X, N, gain); |
| 1314 | celt_exp_rotation(X, N, blocks, K, spread); |
| 1315 | return celt_extract_collapse_mask(y, N, blocks); |
| 1316 | } |
| 1317 | |
| 1318 | static unsigned int celt_decode_band(CeltContext *s, OpusRangeCoder *rc, |
| 1319 | const int band, float *X, float *Y, |
| 1320 | int N, int b, unsigned int blocks, |
| 1321 | float *lowband, int duration, |
| 1322 | float *lowband_out, int level, |
| 1323 | float gain, float *lowband_scratch, |
| 1324 | int fill) |
| 1325 | { |
| 1326 | const uint8_t *cache; |
| 1327 | int dualstereo, split; |
| 1328 | int imid = 0, iside = 0; |
| 1329 | unsigned int N0 = N; |
| 1330 | int N_B; |
| 1331 | int N_B0; |
| 1332 | int B0 = blocks; |
| 1333 | int time_divide = 0; |
| 1334 | int recombine = 0; |
| 1335 | int inv = 0; |
| 1336 | float mid = 0, side = 0; |
| 1337 | int longblocks = (B0 == 1); |
| 1338 | unsigned int cm = 0; |
| 1339 | |
| 1340 | N_B0 = N_B = N / blocks; |
| 1341 | split = dualstereo = (Y != NULL); |
| 1342 | |
| 1343 | if (N == 1) { |
| 1344 | /* special case for one sample */ |
| 1345 | int i; |
| 1346 | float *x = X; |
| 1347 | for (i = 0; i <= dualstereo; i++) { |
| 1348 | int sign = 0; |
| 1349 | if (s->remaining2 >= 1<<3) { |
| 1350 | sign = opus_getrawbits(rc, 1); |
| 1351 | s->remaining2 -= 1 << 3; |
| 1352 | b -= 1 << 3; |
| 1353 | } |
| 1354 | x[0] = sign ? -1.0f : 1.0f; |
| 1355 | x = Y; |
| 1356 | } |
| 1357 | if (lowband_out) |
| 1358 | lowband_out[0] = X[0]; |
| 1359 | return 1; |
| 1360 | } |
| 1361 | |
| 1362 | if (!dualstereo && level == 0) { |
| 1363 | int tf_change = s->tf_change[band]; |
| 1364 | int k; |
| 1365 | if (tf_change > 0) |
| 1366 | recombine = tf_change; |
| 1367 | /* Band recombining to increase frequency resolution */ |
| 1368 | |
| 1369 | if (lowband && |
| 1370 | (recombine || ((N_B & 1) == 0 && tf_change < 0) || B0 > 1)) { |
| 1371 | int j; |
| 1372 | for (j = 0; j < N; j++) |
| 1373 | lowband_scratch[j] = lowband[j]; |
| 1374 | lowband = lowband_scratch; |
| 1375 | } |
| 1376 | |
| 1377 | for (k = 0; k < recombine; k++) { |
| 1378 | if (lowband) |
| 1379 | celt_haar1(lowband, N >> k, 1 << k); |
| 1380 | fill = celt_bit_interleave[fill & 0xF] | celt_bit_interleave[fill >> 4] << 2; |
| 1381 | } |
| 1382 | blocks >>= recombine; |
| 1383 | N_B <<= recombine; |
| 1384 | |
| 1385 | /* Increasing the time resolution */ |
| 1386 | while ((N_B & 1) == 0 && tf_change < 0) { |
| 1387 | if (lowband) |
| 1388 | celt_haar1(lowband, N_B, blocks); |
| 1389 | fill |= fill << blocks; |
| 1390 | blocks <<= 1; |
| 1391 | N_B >>= 1; |
| 1392 | time_divide++; |
| 1393 | tf_change++; |
| 1394 | } |
| 1395 | B0 = blocks; |
| 1396 | N_B0 = N_B; |
| 1397 | |
| 1398 | /* Reorganize the samples in time order instead of frequency order */ |
| 1399 | if (B0 > 1 && lowband) |
| 1400 | celt_deinterleave_hadamard(s->scratch, lowband, N_B >> recombine, |
| 1401 | B0 << recombine, longblocks); |
| 1402 | } |
| 1403 | |
| 1404 | /* If we need 1.5 more bit than we can produce, split the band in two. */ |
| 1405 | cache = celt_cache_bits + |
| 1406 | celt_cache_index[(duration + 1) * CELT_MAX_BANDS + band]; |
| 1407 | if (!dualstereo && duration >= 0 && b > cache[cache[0]] + 12 && N > 2) { |
| 1408 | N >>= 1; |
| 1409 | Y = X + N; |
| 1410 | split = 1; |
| 1411 | duration -= 1; |
| 1412 | if (blocks == 1) |
| 1413 | fill = (fill & 1) | (fill << 1); |
| 1414 | blocks = (blocks + 1) >> 1; |
| 1415 | } |
| 1416 | |
| 1417 | if (split) { |
| 1418 | int qn; |
| 1419 | int itheta = 0; |
| 1420 | int mbits, sbits, delta; |
| 1421 | int qalloc; |
| 1422 | int pulse_cap; |
| 1423 | int offset; |
| 1424 | int orig_fill; |
| 1425 | int tell; |
| 1426 | |
| 1427 | /* Decide on the resolution to give to the split parameter theta */ |
| 1428 | pulse_cap = celt_log_freq_range[band] + duration * 8; |
| 1429 | offset = (pulse_cap >> 1) - (dualstereo && N == 2 ? CELT_QTHETA_OFFSET_TWOPHASE : |
| 1430 | CELT_QTHETA_OFFSET); |
| 1431 | qn = (dualstereo && band >= s->intensitystereo) ? 1 : |
| 1432 | celt_compute_qn(N, b, offset, pulse_cap, dualstereo); |
| 1433 | tell = opus_rc_tell_frac(rc); |
| 1434 | if (qn != 1) { |
| 1435 | /* Entropy coding of the angle. We use a uniform pdf for the |
| 1436 | time split, a step for stereo, and a triangular one for the rest. */ |
| 1437 | if (dualstereo && N > 2) |
| 1438 | itheta = opus_rc_stepmodel(rc, qn/2); |
| 1439 | else if (dualstereo || B0 > 1) |
| 1440 | itheta = opus_rc_unimodel(rc, qn+1); |
| 1441 | else |
| 1442 | itheta = opus_rc_trimodel(rc, qn); |
| 1443 | itheta = itheta * 16384 / qn; |
| 1444 | /* NOTE: Renormalising X and Y *may* help fixed-point a bit at very high rate. |
| 1445 | Let's do that at higher complexity */ |
| 1446 | } else if (dualstereo) { |
| 1447 | inv = (b > 2 << 3 && s->remaining2 > 2 << 3) ? opus_rc_p2model(rc, 2) : 0; |
| 1448 | itheta = 0; |
| 1449 | } |
| 1450 | qalloc = opus_rc_tell_frac(rc) - tell; |
| 1451 | b -= qalloc; |
| 1452 | |
| 1453 | orig_fill = fill; |
| 1454 | if (itheta == 0) { |
| 1455 | imid = 32767; |
| 1456 | iside = 0; |
| 1457 | fill &= (1 << blocks) - 1; |
| 1458 | delta = -16384; |
| 1459 | } else if (itheta == 16384) { |
| 1460 | imid = 0; |
| 1461 | iside = 32767; |
| 1462 | fill &= ((1 << blocks) - 1) << blocks; |
| 1463 | delta = 16384; |
| 1464 | } else { |
| 1465 | imid = celt_cos(itheta); |
| 1466 | iside = celt_cos(16384-itheta); |
| 1467 | /* This is the mid vs side allocation that minimizes squared error |
| 1468 | in that band. */ |
| 1469 | delta = ROUND_MUL16((N - 1) << 7, celt_log2tan(iside, imid)); |
| 1470 | } |
| 1471 | |
| 1472 | mid = imid / 32768.0f; |
| 1473 | side = iside / 32768.0f; |
| 1474 | |
| 1475 | /* This is a special case for N=2 that only works for stereo and takes |
| 1476 | advantage of the fact that mid and side are orthogonal to encode |
| 1477 | the side with just one bit. */ |
| 1478 | if (N == 2 && dualstereo) { |
| 1479 | int c; |
| 1480 | int sign = 0; |
| 1481 | float tmp; |
| 1482 | float *x2, *y2; |
| 1483 | mbits = b; |
| 1484 | /* Only need one bit for the side */ |
| 1485 | sbits = (itheta != 0 && itheta != 16384) ? 1 << 3 : 0; |
| 1486 | mbits -= sbits; |
| 1487 | c = (itheta > 8192); |
| 1488 | s->remaining2 -= qalloc+sbits; |
| 1489 | |
| 1490 | x2 = c ? Y : X; |
| 1491 | y2 = c ? X : Y; |
| 1492 | if (sbits) |
| 1493 | sign = opus_getrawbits(rc, 1); |
| 1494 | sign = 1 - 2 * sign; |
| 1495 | /* We use orig_fill here because we want to fold the side, but if |
| 1496 | itheta==16384, we'll have cleared the low bits of fill. */ |
| 1497 | cm = celt_decode_band(s, rc, band, x2, NULL, N, mbits, blocks, |
| 1498 | lowband, duration, lowband_out, level, gain, |
| 1499 | lowband_scratch, orig_fill); |
| 1500 | /* We don't split N=2 bands, so cm is either 1 or 0 (for a fold-collapse), |
| 1501 | and there's no need to worry about mixing with the other channel. */ |
| 1502 | y2[0] = -sign * x2[1]; |
| 1503 | y2[1] = sign * x2[0]; |
| 1504 | X[0] *= mid; |
| 1505 | X[1] *= mid; |
| 1506 | Y[0] *= side; |
| 1507 | Y[1] *= side; |
| 1508 | tmp = X[0]; |
| 1509 | X[0] = tmp - Y[0]; |
| 1510 | Y[0] = tmp + Y[0]; |
| 1511 | tmp = X[1]; |
| 1512 | X[1] = tmp - Y[1]; |
| 1513 | Y[1] = tmp + Y[1]; |
| 1514 | } else { |
| 1515 | /* "Normal" split code */ |
| 1516 | float *next_lowband2 = NULL; |
| 1517 | float *next_lowband_out1 = NULL; |
| 1518 | int next_level = 0; |
| 1519 | int rebalance; |
| 1520 | |
| 1521 | /* Give more bits to low-energy MDCTs than they would |
| 1522 | * otherwise deserve */ |
| 1523 | if (B0 > 1 && !dualstereo && (itheta & 0x3fff)) { |
| 1524 | if (itheta > 8192) |
| 1525 | /* Rough approximation for pre-echo masking */ |
| 1526 | delta -= delta >> (4 - duration); |
| 1527 | else |
| 1528 | /* Corresponds to a forward-masking slope of |
| 1529 | * 1.5 dB per 10 ms */ |
| 1530 | delta = FFMIN(0, delta + (N << 3 >> (5 - duration))); |
| 1531 | } |
| 1532 | mbits = av_clip((b - delta) / 2, 0, b); |
| 1533 | sbits = b - mbits; |
| 1534 | s->remaining2 -= qalloc; |
| 1535 | |
| 1536 | if (lowband && !dualstereo) |
| 1537 | next_lowband2 = lowband + N; /* >32-bit split case */ |
| 1538 | |
| 1539 | /* Only stereo needs to pass on lowband_out. |
| 1540 | * Otherwise, it's handled at the end */ |
| 1541 | if (dualstereo) |
| 1542 | next_lowband_out1 = lowband_out; |
| 1543 | else |
| 1544 | next_level = level + 1; |
| 1545 | |
| 1546 | rebalance = s->remaining2; |
| 1547 | if (mbits >= sbits) { |
| 1548 | /* In stereo mode, we do not apply a scaling to the mid |
| 1549 | * because we need the normalized mid for folding later */ |
| 1550 | cm = celt_decode_band(s, rc, band, X, NULL, N, mbits, blocks, |
| 1551 | lowband, duration, next_lowband_out1, |
| 1552 | next_level, dualstereo ? 1.0f : (gain * mid), |
| 1553 | lowband_scratch, fill); |
| 1554 | |
| 1555 | rebalance = mbits - (rebalance - s->remaining2); |
| 1556 | if (rebalance > 3 << 3 && itheta != 0) |
| 1557 | sbits += rebalance - (3 << 3); |
| 1558 | |
| 1559 | /* For a stereo split, the high bits of fill are always zero, |
| 1560 | * so no folding will be done to the side. */ |
| 1561 | cm |= celt_decode_band(s, rc, band, Y, NULL, N, sbits, blocks, |
| 1562 | next_lowband2, duration, NULL, |
| 1563 | next_level, gain * side, NULL, |
| 1564 | fill >> blocks) << ((B0 >> 1) & (dualstereo - 1)); |
| 1565 | } else { |
| 1566 | /* For a stereo split, the high bits of fill are always zero, |
| 1567 | * so no folding will be done to the side. */ |
| 1568 | cm = celt_decode_band(s, rc, band, Y, NULL, N, sbits, blocks, |
| 1569 | next_lowband2, duration, NULL, |
| 1570 | next_level, gain * side, NULL, |
| 1571 | fill >> blocks) << ((B0 >> 1) & (dualstereo - 1)); |
| 1572 | |
| 1573 | rebalance = sbits - (rebalance - s->remaining2); |
| 1574 | if (rebalance > 3 << 3 && itheta != 16384) |
| 1575 | mbits += rebalance - (3 << 3); |
| 1576 | |
| 1577 | /* In stereo mode, we do not apply a scaling to the mid because |
| 1578 | * we need the normalized mid for folding later */ |
| 1579 | cm |= celt_decode_band(s, rc, band, X, NULL, N, mbits, blocks, |
| 1580 | lowband, duration, next_lowband_out1, |
| 1581 | next_level, dualstereo ? 1.0f : (gain * mid), |
| 1582 | lowband_scratch, fill); |
| 1583 | } |
| 1584 | } |
| 1585 | } else { |
| 1586 | /* This is the basic no-split case */ |
| 1587 | unsigned int q = celt_bits2pulses(cache, b); |
| 1588 | unsigned int curr_bits = celt_pulses2bits(cache, q); |
| 1589 | s->remaining2 -= curr_bits; |
| 1590 | |
| 1591 | /* Ensures we can never bust the budget */ |
| 1592 | while (s->remaining2 < 0 && q > 0) { |
| 1593 | s->remaining2 += curr_bits; |
| 1594 | curr_bits = celt_pulses2bits(cache, --q); |
| 1595 | s->remaining2 -= curr_bits; |
| 1596 | } |
| 1597 | |
| 1598 | if (q != 0) { |
| 1599 | /* Finally do the actual quantization */ |
| 1600 | cm = celt_alg_unquant(rc, X, N, (q < 8) ? q : (8 + (q & 7)) << ((q >> 3) - 1), |
| 1601 | s->spread, blocks, gain); |
| 1602 | } else { |
| 1603 | /* If there's no pulse, fill the band anyway */ |
| 1604 | int j; |
| 1605 | unsigned int cm_mask = (1 << blocks) - 1; |
| 1606 | fill &= cm_mask; |
| 1607 | if (!fill) { |
| 1608 | for (j = 0; j < N; j++) |
| 1609 | X[j] = 0.0f; |
| 1610 | } else { |
| 1611 | if (!lowband) { |
| 1612 | /* Noise */ |
| 1613 | for (j = 0; j < N; j++) |
| 1614 | X[j] = (((int32_t)celt_rng(s)) >> 20); |
| 1615 | cm = cm_mask; |
| 1616 | } else { |
| 1617 | /* Folded spectrum */ |
| 1618 | for (j = 0; j < N; j++) { |
| 1619 | /* About 48 dB below the "normal" folding level */ |
| 1620 | X[j] = lowband[j] + (((celt_rng(s)) & 0x8000) ? 1.0f / 256 : -1.0f / 256); |
| 1621 | } |
| 1622 | cm = fill; |
| 1623 | } |
| 1624 | celt_renormalize_vector(X, N, gain); |
| 1625 | } |
| 1626 | } |
| 1627 | } |
| 1628 | |
| 1629 | /* This code is used by the decoder and by the resynthesis-enabled encoder */ |
| 1630 | if (dualstereo) { |
| 1631 | int j; |
| 1632 | if (N != 2) |
| 1633 | celt_stereo_merge(X, Y, mid, N); |
| 1634 | if (inv) { |
| 1635 | for (j = 0; j < N; j++) |
| 1636 | Y[j] *= -1; |
| 1637 | } |
| 1638 | } else if (level == 0) { |
| 1639 | int k; |
| 1640 | |
| 1641 | /* Undo the sample reorganization going from time order to frequency order */ |
| 1642 | if (B0 > 1) |
| 1643 | celt_interleave_hadamard(s->scratch, X, N_B>>recombine, |
| 1644 | B0<<recombine, longblocks); |
| 1645 | |
| 1646 | /* Undo time-freq changes that we did earlier */ |
| 1647 | N_B = N_B0; |
| 1648 | blocks = B0; |
| 1649 | for (k = 0; k < time_divide; k++) { |
| 1650 | blocks >>= 1; |
| 1651 | N_B <<= 1; |
| 1652 | cm |= cm >> blocks; |
| 1653 | celt_haar1(X, N_B, blocks); |
| 1654 | } |
| 1655 | |
| 1656 | for (k = 0; k < recombine; k++) { |
| 1657 | cm = celt_bit_deinterleave[cm]; |
| 1658 | celt_haar1(X, N0>>k, 1<<k); |
| 1659 | } |
| 1660 | blocks <<= recombine; |
| 1661 | |
| 1662 | /* Scale output for later folding */ |
| 1663 | if (lowband_out) { |
| 1664 | int j; |
| 1665 | float n = sqrtf(N0); |
| 1666 | for (j = 0; j < N0; j++) |
| 1667 | lowband_out[j] = n * X[j]; |
| 1668 | } |
| 1669 | cm &= (1 << blocks) - 1; |
| 1670 | } |
| 1671 | return cm; |
| 1672 | } |
| 1673 | |
| 1674 | static void celt_denormalize(CeltContext *s, CeltFrame *frame, float *data) |
| 1675 | { |
| 1676 | int i, j; |
| 1677 | |
| 1678 | for (i = s->startband; i < s->endband; i++) { |
| 1679 | float *dst = data + (celt_freq_bands[i] << s->duration); |
| 1680 | float norm = pow(2, frame->energy[i] + celt_mean_energy[i]); |
| 1681 | |
| 1682 | for (j = 0; j < celt_freq_range[i] << s->duration; j++) |
| 1683 | dst[j] *= norm; |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | static void celt_postfilter_apply_transition(CeltFrame *frame, float *data) |
| 1688 | { |
| 1689 | const int T0 = frame->pf_period_old; |
| 1690 | const int T1 = frame->pf_period; |
| 1691 | |
| 1692 | float g00, g01, g02; |
| 1693 | float g10, g11, g12; |
| 1694 | |
| 1695 | float x0, x1, x2, x3, x4; |
| 1696 | |
| 1697 | int i; |
| 1698 | |
| 1699 | if (frame->pf_gains[0] == 0.0 && |
| 1700 | frame->pf_gains_old[0] == 0.0) |
| 1701 | return; |
| 1702 | |
| 1703 | g00 = frame->pf_gains_old[0]; |
| 1704 | g01 = frame->pf_gains_old[1]; |
| 1705 | g02 = frame->pf_gains_old[2]; |
| 1706 | g10 = frame->pf_gains[0]; |
| 1707 | g11 = frame->pf_gains[1]; |
| 1708 | g12 = frame->pf_gains[2]; |
| 1709 | |
| 1710 | x1 = data[-T1 + 1]; |
| 1711 | x2 = data[-T1]; |
| 1712 | x3 = data[-T1 - 1]; |
| 1713 | x4 = data[-T1 - 2]; |
| 1714 | |
| 1715 | for (i = 0; i < CELT_OVERLAP; i++) { |
| 1716 | float w = ff_celt_window2[i]; |
| 1717 | x0 = data[i - T1 + 2]; |
| 1718 | |
| 1719 | data[i] += (1.0 - w) * g00 * data[i - T0] + |
| 1720 | (1.0 - w) * g01 * (data[i - T0 - 1] + data[i - T0 + 1]) + |
| 1721 | (1.0 - w) * g02 * (data[i - T0 - 2] + data[i - T0 + 2]) + |
| 1722 | w * g10 * x2 + |
| 1723 | w * g11 * (x1 + x3) + |
| 1724 | w * g12 * (x0 + x4); |
| 1725 | x4 = x3; |
| 1726 | x3 = x2; |
| 1727 | x2 = x1; |
| 1728 | x1 = x0; |
| 1729 | } |
| 1730 | } |
| 1731 | |
| 1732 | static void celt_postfilter_apply(CeltFrame *frame, |
| 1733 | float *data, int len) |
| 1734 | { |
| 1735 | const int T = frame->pf_period; |
| 1736 | float g0, g1, g2; |
| 1737 | float x0, x1, x2, x3, x4; |
| 1738 | int i; |
| 1739 | |
| 1740 | if (frame->pf_gains[0] == 0.0 || len <= 0) |
| 1741 | return; |
| 1742 | |
| 1743 | g0 = frame->pf_gains[0]; |
| 1744 | g1 = frame->pf_gains[1]; |
| 1745 | g2 = frame->pf_gains[2]; |
| 1746 | |
| 1747 | x4 = data[-T - 2]; |
| 1748 | x3 = data[-T - 1]; |
| 1749 | x2 = data[-T]; |
| 1750 | x1 = data[-T + 1]; |
| 1751 | |
| 1752 | for (i = 0; i < len; i++) { |
| 1753 | x0 = data[i - T + 2]; |
| 1754 | data[i] += g0 * x2 + |
| 1755 | g1 * (x1 + x3) + |
| 1756 | g2 * (x0 + x4); |
| 1757 | x4 = x3; |
| 1758 | x3 = x2; |
| 1759 | x2 = x1; |
| 1760 | x1 = x0; |
| 1761 | } |
| 1762 | } |
| 1763 | |
| 1764 | static void celt_postfilter(CeltContext *s, CeltFrame *frame) |
| 1765 | { |
| 1766 | int len = s->blocksize * s->blocks; |
| 1767 | |
| 1768 | celt_postfilter_apply_transition(frame, frame->buf + 1024); |
| 1769 | |
| 1770 | frame->pf_period_old = frame->pf_period; |
| 1771 | memcpy(frame->pf_gains_old, frame->pf_gains, sizeof(frame->pf_gains)); |
| 1772 | |
| 1773 | frame->pf_period = frame->pf_period_new; |
| 1774 | memcpy(frame->pf_gains, frame->pf_gains_new, sizeof(frame->pf_gains)); |
| 1775 | |
| 1776 | if (len > CELT_OVERLAP) { |
| 1777 | celt_postfilter_apply_transition(frame, frame->buf + 1024 + CELT_OVERLAP); |
| 1778 | celt_postfilter_apply(frame, frame->buf + 1024 + 2 * CELT_OVERLAP, |
| 1779 | len - 2 * CELT_OVERLAP); |
| 1780 | |
| 1781 | frame->pf_period_old = frame->pf_period; |
| 1782 | memcpy(frame->pf_gains_old, frame->pf_gains, sizeof(frame->pf_gains)); |
| 1783 | } |
| 1784 | |
| 1785 | memmove(frame->buf, frame->buf + len, (1024 + CELT_OVERLAP / 2) * sizeof(float)); |
| 1786 | } |
| 1787 | |
| 1788 | static int parse_postfilter(CeltContext *s, OpusRangeCoder *rc, int consumed) |
| 1789 | { |
| 1790 | static const float postfilter_taps[3][3] = { |
| 1791 | { 0.3066406250f, 0.2170410156f, 0.1296386719f }, |
| 1792 | { 0.4638671875f, 0.2680664062f, 0.0 }, |
| 1793 | { 0.7998046875f, 0.1000976562f, 0.0 } |
| 1794 | }; |
| 1795 | int i; |
| 1796 | |
| 1797 | memset(s->frame[0].pf_gains_new, 0, sizeof(s->frame[0].pf_gains_new)); |
| 1798 | memset(s->frame[1].pf_gains_new, 0, sizeof(s->frame[1].pf_gains_new)); |
| 1799 | |
| 1800 | if (s->startband == 0 && consumed + 16 <= s->framebits) { |
| 1801 | int has_postfilter = opus_rc_p2model(rc, 1); |
| 1802 | if (has_postfilter) { |
| 1803 | float gain; |
| 1804 | int tapset, octave, period; |
| 1805 | |
| 1806 | octave = opus_rc_unimodel(rc, 6); |
| 1807 | period = (16 << octave) + opus_getrawbits(rc, 4 + octave) - 1; |
| 1808 | gain = 0.09375f * (opus_getrawbits(rc, 3) + 1); |
| 1809 | tapset = (opus_rc_tell(rc) + 2 <= s->framebits) ? |
| 1810 | opus_rc_getsymbol(rc, celt_model_tapset) : 0; |
| 1811 | |
| 1812 | for (i = 0; i < 2; i++) { |
| 1813 | CeltFrame *frame = &s->frame[i]; |
| 1814 | |
| 1815 | frame->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD); |
| 1816 | frame->pf_gains_new[0] = gain * postfilter_taps[tapset][0]; |
| 1817 | frame->pf_gains_new[1] = gain * postfilter_taps[tapset][1]; |
| 1818 | frame->pf_gains_new[2] = gain * postfilter_taps[tapset][2]; |
| 1819 | } |
| 1820 | } |
| 1821 | |
| 1822 | consumed = opus_rc_tell(rc); |
| 1823 | } |
| 1824 | |
| 1825 | return consumed; |
| 1826 | } |
| 1827 | |
| 1828 | static void process_anticollapse(CeltContext *s, CeltFrame *frame, float *X) |
| 1829 | { |
| 1830 | int i, j, k; |
| 1831 | |
| 1832 | for (i = s->startband; i < s->endband; i++) { |
| 1833 | int renormalize = 0; |
| 1834 | float *xptr; |
| 1835 | float prev[2]; |
| 1836 | float Ediff, r; |
| 1837 | float thresh, sqrt_1; |
| 1838 | int depth; |
| 1839 | |
| 1840 | /* depth in 1/8 bits */ |
| 1841 | depth = (1 + s->pulses[i]) / (celt_freq_range[i] << s->duration); |
| 1842 | thresh = pow(2, -1.0 - 0.125f * depth); |
| 1843 | sqrt_1 = 1.0f / sqrtf(celt_freq_range[i] << s->duration); |
| 1844 | |
| 1845 | xptr = X + (celt_freq_bands[i] << s->duration); |
| 1846 | |
| 1847 | prev[0] = frame->prev_energy[0][i]; |
| 1848 | prev[1] = frame->prev_energy[1][i]; |
| 1849 | if (s->coded_channels == 1) { |
| 1850 | CeltFrame *frame1 = &s->frame[1]; |
| 1851 | |
| 1852 | prev[0] = FFMAX(prev[0], frame1->prev_energy[0][i]); |
| 1853 | prev[1] = FFMAX(prev[1], frame1->prev_energy[1][i]); |
| 1854 | } |
| 1855 | Ediff = frame->energy[i] - FFMIN(prev[0], prev[1]); |
| 1856 | Ediff = FFMAX(0, Ediff); |
| 1857 | |
| 1858 | /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because |
| 1859 | short blocks don't have the same energy as long */ |
| 1860 | r = pow(2, 1 - Ediff); |
| 1861 | if (s->duration == 3) |
| 1862 | r *= M_SQRT2; |
| 1863 | r = FFMIN(thresh, r) * sqrt_1; |
| 1864 | for (k = 0; k < 1 << s->duration; k++) { |
| 1865 | /* Detect collapse */ |
| 1866 | if (!(frame->collapse_masks[i] & 1 << k)) { |
| 1867 | /* Fill with noise */ |
| 1868 | for (j = 0; j < celt_freq_range[i]; j++) |
| 1869 | xptr[(j << s->duration) + k] = (celt_rng(s) & 0x8000) ? r : -r; |
| 1870 | renormalize = 1; |
| 1871 | } |
| 1872 | } |
| 1873 | |
| 1874 | /* We just added some energy, so we need to renormalize */ |
| 1875 | if (renormalize) |
| 1876 | celt_renormalize_vector(xptr, celt_freq_range[i] << s->duration, 1.0f); |
| 1877 | } |
| 1878 | } |
| 1879 | |
| 1880 | static void celt_decode_bands(CeltContext *s, OpusRangeCoder *rc) |
| 1881 | { |
| 1882 | float lowband_scratch[8 * 22]; |
| 1883 | float norm[2 * 8 * 100]; |
| 1884 | |
| 1885 | int totalbits = (s->framebits << 3) - s->anticollapse_bit; |
| 1886 | |
| 1887 | int update_lowband = 1; |
| 1888 | int lowband_offset = 0; |
| 1889 | |
| 1890 | int i, j; |
| 1891 | |
| 1892 | memset(s->coeffs, 0, sizeof(s->coeffs)); |
| 1893 | |
| 1894 | for (i = s->startband; i < s->endband; i++) { |
| 1895 | int band_offset = celt_freq_bands[i] << s->duration; |
| 1896 | int band_size = celt_freq_range[i] << s->duration; |
| 1897 | float *X = s->coeffs[0] + band_offset; |
| 1898 | float *Y = (s->coded_channels == 2) ? s->coeffs[1] + band_offset : NULL; |
| 1899 | |
| 1900 | int consumed = opus_rc_tell_frac(rc); |
| 1901 | float *norm2 = norm + 8 * 100; |
| 1902 | int effective_lowband = -1; |
| 1903 | unsigned int cm[2]; |
| 1904 | int b; |
| 1905 | |
| 1906 | /* Compute how many bits we want to allocate to this band */ |
| 1907 | if (i != s->startband) |
| 1908 | s->remaining -= consumed; |
| 1909 | s->remaining2 = totalbits - consumed - 1; |
| 1910 | if (i <= s->codedbands - 1) { |
| 1911 | int curr_balance = s->remaining / FFMIN(3, s->codedbands-i); |
| 1912 | b = av_clip(FFMIN(s->remaining2 + 1, s->pulses[i] + curr_balance), 0, 16383); |
| 1913 | } else |
| 1914 | b = 0; |
| 1915 | |
| 1916 | if (celt_freq_bands[i] - celt_freq_range[i] >= celt_freq_bands[s->startband] && |
| 1917 | (update_lowband || lowband_offset == 0)) |
| 1918 | lowband_offset = i; |
| 1919 | |
| 1920 | /* Get a conservative estimate of the collapse_mask's for the bands we're |
| 1921 | going to be folding from. */ |
| 1922 | if (lowband_offset != 0 && (s->spread != CELT_SPREAD_AGGRESSIVE || |
| 1923 | s->blocks > 1 || s->tf_change[i] < 0)) { |
| 1924 | int foldstart, foldend; |
| 1925 | |
| 1926 | /* This ensures we never repeat spectral content within one band */ |
| 1927 | effective_lowband = FFMAX(celt_freq_bands[s->startband], |
| 1928 | celt_freq_bands[lowband_offset] - celt_freq_range[i]); |
| 1929 | foldstart = lowband_offset; |
| 1930 | while (celt_freq_bands[--foldstart] > effective_lowband); |
| 1931 | foldend = lowband_offset - 1; |
| 1932 | while (celt_freq_bands[++foldend] < effective_lowband + celt_freq_range[i]); |
| 1933 | |
| 1934 | cm[0] = cm[1] = 0; |
| 1935 | for (j = foldstart; j < foldend; j++) { |
| 1936 | cm[0] |= s->frame[0].collapse_masks[j]; |
| 1937 | cm[1] |= s->frame[s->coded_channels - 1].collapse_masks[j]; |
| 1938 | } |
| 1939 | } else |
| 1940 | /* Otherwise, we'll be using the LCG to fold, so all blocks will (almost |
| 1941 | always) be non-zero.*/ |
| 1942 | cm[0] = cm[1] = (1 << s->blocks) - 1; |
| 1943 | |
| 1944 | if (s->dualstereo && i == s->intensitystereo) { |
| 1945 | /* Switch off dual stereo to do intensity */ |
| 1946 | s->dualstereo = 0; |
| 1947 | for (j = celt_freq_bands[s->startband] << s->duration; j < band_offset; j++) |
| 1948 | norm[j] = (norm[j] + norm2[j]) / 2; |
| 1949 | } |
| 1950 | |
| 1951 | if (s->dualstereo) { |
| 1952 | cm[0] = celt_decode_band(s, rc, i, X, NULL, band_size, b / 2, s->blocks, |
| 1953 | effective_lowband != -1 ? norm + (effective_lowband << s->duration) : NULL, s->duration, |
| 1954 | norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]); |
| 1955 | |
| 1956 | cm[1] = celt_decode_band(s, rc, i, Y, NULL, band_size, b/2, s->blocks, |
| 1957 | effective_lowband != -1 ? norm2 + (effective_lowband << s->duration) : NULL, s->duration, |
| 1958 | norm2 + band_offset, 0, 1.0f, lowband_scratch, cm[1]); |
| 1959 | } else { |
| 1960 | cm[0] = celt_decode_band(s, rc, i, X, Y, band_size, b, s->blocks, |
| 1961 | effective_lowband != -1 ? norm + (effective_lowband << s->duration) : NULL, s->duration, |
| 1962 | norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]|cm[1]); |
| 1963 | |
| 1964 | cm[1] = cm[0]; |
| 1965 | } |
| 1966 | |
| 1967 | s->frame[0].collapse_masks[i] = (uint8_t)cm[0]; |
| 1968 | s->frame[s->coded_channels - 1].collapse_masks[i] = (uint8_t)cm[1]; |
| 1969 | s->remaining += s->pulses[i] + consumed; |
| 1970 | |
| 1971 | /* Update the folding position only as long as we have 1 bit/sample depth */ |
| 1972 | update_lowband = (b > band_size << 3); |
| 1973 | } |
| 1974 | } |
| 1975 | |
| 1976 | int ff_celt_decode_frame(CeltContext *s, OpusRangeCoder *rc, |
| 1977 | float **output, int coded_channels, int frame_size, |
| 1978 | int startband, int endband) |
| 1979 | { |
| 1980 | int i, j; |
| 1981 | |
| 1982 | int consumed; // bits of entropy consumed thus far for this frame |
| 1983 | int silence = 0; |
| 1984 | int transient = 0; |
| 1985 | int anticollapse = 0; |
| 1986 | CeltIMDCTContext *imdct; |
| 1987 | float imdct_scale = 1.0; |
| 1988 | |
| 1989 | if (coded_channels != 1 && coded_channels != 2) { |
| 1990 | av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coded channels: %d\n", |
| 1991 | coded_channels); |
| 1992 | return AVERROR_INVALIDDATA; |
| 1993 | } |
| 1994 | if (startband < 0 || startband > endband || endband > CELT_MAX_BANDS) { |
| 1995 | av_log(s->avctx, AV_LOG_ERROR, "Invalid start/end band: %d %d\n", |
| 1996 | startband, endband); |
| 1997 | return AVERROR_INVALIDDATA; |
| 1998 | } |
| 1999 | |
| 2000 | s->flushed = 0; |
| 2001 | s->coded_channels = coded_channels; |
| 2002 | s->startband = startband; |
| 2003 | s->endband = endband; |
| 2004 | s->framebits = rc->rb.bytes * 8; |
| 2005 | |
| 2006 | s->duration = av_log2(frame_size / CELT_SHORT_BLOCKSIZE); |
| 2007 | if (s->duration > CELT_MAX_LOG_BLOCKS || |
| 2008 | frame_size != CELT_SHORT_BLOCKSIZE * (1 << s->duration)) { |
| 2009 | av_log(s->avctx, AV_LOG_ERROR, "Invalid CELT frame size: %d\n", |
| 2010 | frame_size); |
| 2011 | return AVERROR_INVALIDDATA; |
| 2012 | } |
| 2013 | |
| 2014 | if (!s->output_channels) |
| 2015 | s->output_channels = coded_channels; |
| 2016 | |
| 2017 | memset(s->frame[0].collapse_masks, 0, sizeof(s->frame[0].collapse_masks)); |
| 2018 | memset(s->frame[1].collapse_masks, 0, sizeof(s->frame[1].collapse_masks)); |
| 2019 | |
| 2020 | consumed = opus_rc_tell(rc); |
| 2021 | |
| 2022 | /* obtain silence flag */ |
| 2023 | if (consumed >= s->framebits) |
| 2024 | silence = 1; |
| 2025 | else if (consumed == 1) |
| 2026 | silence = opus_rc_p2model(rc, 15); |
| 2027 | |
| 2028 | |
| 2029 | if (silence) { |
| 2030 | consumed = s->framebits; |
| 2031 | rc->total_read_bits += s->framebits - opus_rc_tell(rc); |
| 2032 | } |
| 2033 | |
| 2034 | /* obtain post-filter options */ |
| 2035 | consumed = parse_postfilter(s, rc, consumed); |
| 2036 | |
| 2037 | /* obtain transient flag */ |
| 2038 | if (s->duration != 0 && consumed+3 <= s->framebits) |
| 2039 | transient = opus_rc_p2model(rc, 3); |
| 2040 | |
| 2041 | s->blocks = transient ? 1 << s->duration : 1; |
| 2042 | s->blocksize = frame_size / s->blocks; |
| 2043 | |
| 2044 | imdct = s->imdct[transient ? 0 : s->duration]; |
| 2045 | |
| 2046 | if (coded_channels == 1) { |
| 2047 | for (i = 0; i < CELT_MAX_BANDS; i++) |
| 2048 | s->frame[0].energy[i] = FFMAX(s->frame[0].energy[i], s->frame[1].energy[i]); |
| 2049 | } |
| 2050 | |
| 2051 | celt_decode_coarse_energy(s, rc); |
| 2052 | celt_decode_tf_changes (s, rc, transient); |
| 2053 | celt_decode_allocation (s, rc); |
| 2054 | celt_decode_fine_energy (s, rc); |
| 2055 | celt_decode_bands (s, rc); |
| 2056 | |
| 2057 | if (s->anticollapse_bit) |
| 2058 | anticollapse = opus_getrawbits(rc, 1); |
| 2059 | |
| 2060 | celt_decode_final_energy(s, rc, s->framebits - opus_rc_tell(rc)); |
| 2061 | |
| 2062 | /* apply anti-collapse processing and denormalization to |
| 2063 | * each coded channel */ |
| 2064 | for (i = 0; i < s->coded_channels; i++) { |
| 2065 | CeltFrame *frame = &s->frame[i]; |
| 2066 | |
| 2067 | if (anticollapse) |
| 2068 | process_anticollapse(s, frame, s->coeffs[i]); |
| 2069 | |
| 2070 | celt_denormalize(s, frame, s->coeffs[i]); |
| 2071 | } |
| 2072 | |
| 2073 | /* stereo -> mono downmix */ |
| 2074 | if (s->output_channels < s->coded_channels) { |
| 2075 | s->dsp.vector_fmac_scalar(s->coeffs[0], s->coeffs[1], 1.0, FFALIGN(frame_size, 16)); |
| 2076 | imdct_scale = 0.5; |
| 2077 | } else if (s->output_channels > s->coded_channels) |
| 2078 | memcpy(s->coeffs[1], s->coeffs[0], frame_size * sizeof(float)); |
| 2079 | |
| 2080 | if (silence) { |
| 2081 | for (i = 0; i < 2; i++) { |
| 2082 | CeltFrame *frame = &s->frame[i]; |
| 2083 | |
| 2084 | for (j = 0; j < FF_ARRAY_ELEMS(frame->energy); j++) |
| 2085 | frame->energy[j] = CELT_ENERGY_SILENCE; |
| 2086 | } |
| 2087 | memset(s->coeffs, 0, sizeof(s->coeffs)); |
| 2088 | } |
| 2089 | |
| 2090 | /* transform and output for each output channel */ |
| 2091 | for (i = 0; i < s->output_channels; i++) { |
| 2092 | CeltFrame *frame = &s->frame[i]; |
| 2093 | float m = frame->deemph_coeff; |
| 2094 | |
| 2095 | /* iMDCT and overlap-add */ |
| 2096 | for (j = 0; j < s->blocks; j++) { |
| 2097 | float *dst = frame->buf + 1024 + j * s->blocksize; |
| 2098 | |
| 2099 | imdct->imdct_half(imdct, dst + CELT_OVERLAP / 2, s->coeffs[i] + j, |
| 2100 | s->blocks, imdct_scale); |
| 2101 | s->dsp.vector_fmul_window(dst, dst, dst + CELT_OVERLAP / 2, |
| 2102 | celt_window, CELT_OVERLAP / 2); |
| 2103 | } |
| 2104 | |
| 2105 | /* postfilter */ |
| 2106 | celt_postfilter(s, frame); |
| 2107 | |
| 2108 | /* deemphasis and output scaling */ |
| 2109 | for (j = 0; j < frame_size; j++) { |
| 2110 | float tmp = frame->buf[1024 - frame_size + j] + m; |
| 2111 | m = tmp * CELT_DEEMPH_COEFF; |
| 2112 | output[i][j] = tmp / 32768.; |
| 2113 | } |
| 2114 | frame->deemph_coeff = m; |
| 2115 | } |
| 2116 | |
| 2117 | if (coded_channels == 1) |
| 2118 | memcpy(s->frame[1].energy, s->frame[0].energy, sizeof(s->frame[0].energy)); |
| 2119 | |
| 2120 | for (i = 0; i < 2; i++ ) { |
| 2121 | CeltFrame *frame = &s->frame[i]; |
| 2122 | |
| 2123 | if (!transient) { |
| 2124 | memcpy(frame->prev_energy[1], frame->prev_energy[0], sizeof(frame->prev_energy[0])); |
| 2125 | memcpy(frame->prev_energy[0], frame->energy, sizeof(frame->prev_energy[0])); |
| 2126 | } else { |
| 2127 | for (j = 0; j < CELT_MAX_BANDS; j++) |
| 2128 | frame->prev_energy[0][j] = FFMIN(frame->prev_energy[0][j], frame->energy[j]); |
| 2129 | } |
| 2130 | |
| 2131 | for (j = 0; j < s->startband; j++) { |
| 2132 | frame->prev_energy[0][j] = CELT_ENERGY_SILENCE; |
| 2133 | frame->energy[j] = 0.0; |
| 2134 | } |
| 2135 | for (j = s->endband; j < CELT_MAX_BANDS; j++) { |
| 2136 | frame->prev_energy[0][j] = CELT_ENERGY_SILENCE; |
| 2137 | frame->energy[j] = 0.0; |
| 2138 | } |
| 2139 | } |
| 2140 | |
| 2141 | s->seed = rc->range; |
| 2142 | |
| 2143 | return 0; |
| 2144 | } |
| 2145 | |
| 2146 | void ff_celt_flush(CeltContext *s) |
| 2147 | { |
| 2148 | int i, j; |
| 2149 | |
| 2150 | if (s->flushed) |
| 2151 | return; |
| 2152 | |
| 2153 | for (i = 0; i < 2; i++) { |
| 2154 | CeltFrame *frame = &s->frame[i]; |
| 2155 | |
| 2156 | for (j = 0; j < CELT_MAX_BANDS; j++) |
| 2157 | frame->prev_energy[0][j] = frame->prev_energy[1][j] = CELT_ENERGY_SILENCE; |
| 2158 | |
| 2159 | memset(frame->energy, 0, sizeof(frame->energy)); |
| 2160 | memset(frame->buf, 0, sizeof(frame->buf)); |
| 2161 | |
| 2162 | memset(frame->pf_gains, 0, sizeof(frame->pf_gains)); |
| 2163 | memset(frame->pf_gains_old, 0, sizeof(frame->pf_gains_old)); |
| 2164 | memset(frame->pf_gains_new, 0, sizeof(frame->pf_gains_new)); |
| 2165 | |
| 2166 | frame->deemph_coeff = 0.0; |
| 2167 | } |
| 2168 | s->seed = 0; |
| 2169 | |
| 2170 | s->flushed = 1; |
| 2171 | } |
| 2172 | |
| 2173 | void ff_celt_free(CeltContext **ps) |
| 2174 | { |
| 2175 | CeltContext *s = *ps; |
| 2176 | int i; |
| 2177 | |
| 2178 | if (!s) |
| 2179 | return; |
| 2180 | |
| 2181 | for (i = 0; i < FF_ARRAY_ELEMS(s->imdct); i++) |
| 2182 | ff_celt_imdct_uninit(&s->imdct[i]); |
| 2183 | |
| 2184 | av_freep(ps); |
| 2185 | } |
| 2186 | |
| 2187 | int ff_celt_init(AVCodecContext *avctx, CeltContext **ps, int output_channels) |
| 2188 | { |
| 2189 | CeltContext *s; |
| 2190 | int i, ret; |
| 2191 | |
| 2192 | if (output_channels != 1 && output_channels != 2) { |
| 2193 | av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n", |
| 2194 | output_channels); |
| 2195 | return AVERROR(EINVAL); |
| 2196 | } |
| 2197 | |
| 2198 | s = av_mallocz(sizeof(*s)); |
| 2199 | if (!s) |
| 2200 | return AVERROR(ENOMEM); |
| 2201 | |
| 2202 | s->avctx = avctx; |
| 2203 | s->output_channels = output_channels; |
| 2204 | |
| 2205 | for (i = 0; i < FF_ARRAY_ELEMS(s->imdct); i++) { |
| 2206 | ret = ff_celt_imdct_init(&s->imdct[i], i + 3); |
| 2207 | if (ret < 0) |
| 2208 | goto fail; |
| 2209 | } |
| 2210 | |
| 2211 | avpriv_float_dsp_init(&s->dsp, avctx->flags & CODEC_FLAG_BITEXACT); |
| 2212 | |
| 2213 | ff_celt_flush(s); |
| 2214 | |
| 2215 | *ps = s; |
| 2216 | |
| 2217 | return 0; |
| 2218 | fail: |
| 2219 | ff_celt_free(&s); |
| 2220 | return ret; |
| 2221 | } |