| 1 | /* |
| 2 | * AAC Spectral Band Replication decoding functions |
| 3 | * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl ) |
| 4 | * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com> |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * @file |
| 25 | * AAC Spectral Band Replication decoding functions |
| 26 | * @author Robert Swain ( rob opendot cl ) |
| 27 | */ |
| 28 | |
| 29 | #include "aac.h" |
| 30 | #include "sbr.h" |
| 31 | #include "aacsbr.h" |
| 32 | #include "aacsbrdata.h" |
| 33 | #include "aacsbr_tablegen.h" |
| 34 | #include "fft.h" |
| 35 | #include "aacps.h" |
| 36 | #include "sbrdsp.h" |
| 37 | #include "libavutil/internal.h" |
| 38 | #include "libavutil/libm.h" |
| 39 | #include "libavutil/avassert.h" |
| 40 | |
| 41 | #include <stdint.h> |
| 42 | #include <float.h> |
| 43 | #include <math.h> |
| 44 | |
| 45 | #define ENVELOPE_ADJUSTMENT_OFFSET 2 |
| 46 | #define NOISE_FLOOR_OFFSET 6.0f |
| 47 | |
| 48 | #if ARCH_MIPS |
| 49 | #include "mips/aacsbr_mips.h" |
| 50 | #endif /* ARCH_MIPS */ |
| 51 | |
| 52 | /** |
| 53 | * SBR VLC tables |
| 54 | */ |
| 55 | enum { |
| 56 | T_HUFFMAN_ENV_1_5DB, |
| 57 | F_HUFFMAN_ENV_1_5DB, |
| 58 | T_HUFFMAN_ENV_BAL_1_5DB, |
| 59 | F_HUFFMAN_ENV_BAL_1_5DB, |
| 60 | T_HUFFMAN_ENV_3_0DB, |
| 61 | F_HUFFMAN_ENV_3_0DB, |
| 62 | T_HUFFMAN_ENV_BAL_3_0DB, |
| 63 | F_HUFFMAN_ENV_BAL_3_0DB, |
| 64 | T_HUFFMAN_NOISE_3_0DB, |
| 65 | T_HUFFMAN_NOISE_BAL_3_0DB, |
| 66 | }; |
| 67 | |
| 68 | /** |
| 69 | * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98) |
| 70 | */ |
| 71 | enum { |
| 72 | FIXFIX, |
| 73 | FIXVAR, |
| 74 | VARFIX, |
| 75 | VARVAR, |
| 76 | }; |
| 77 | |
| 78 | enum { |
| 79 | EXTENSION_ID_PS = 2, |
| 80 | }; |
| 81 | |
| 82 | static VLC vlc_sbr[10]; |
| 83 | static const int8_t vlc_sbr_lav[10] = |
| 84 | { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 }; |
| 85 | |
| 86 | #define SBR_INIT_VLC_STATIC(num, size) \ |
| 87 | INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \ |
| 88 | sbr_tmp[num].sbr_bits , 1, 1, \ |
| 89 | sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \ |
| 90 | size) |
| 91 | |
| 92 | #define SBR_VLC_ROW(name) \ |
| 93 | { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) } |
| 94 | |
| 95 | static void aacsbr_func_ptr_init(AACSBRContext *c); |
| 96 | |
| 97 | av_cold void ff_aac_sbr_init(void) |
| 98 | { |
| 99 | static const struct { |
| 100 | const void *sbr_codes, *sbr_bits; |
| 101 | const unsigned int table_size, elem_size; |
| 102 | } sbr_tmp[] = { |
| 103 | SBR_VLC_ROW(t_huffman_env_1_5dB), |
| 104 | SBR_VLC_ROW(f_huffman_env_1_5dB), |
| 105 | SBR_VLC_ROW(t_huffman_env_bal_1_5dB), |
| 106 | SBR_VLC_ROW(f_huffman_env_bal_1_5dB), |
| 107 | SBR_VLC_ROW(t_huffman_env_3_0dB), |
| 108 | SBR_VLC_ROW(f_huffman_env_3_0dB), |
| 109 | SBR_VLC_ROW(t_huffman_env_bal_3_0dB), |
| 110 | SBR_VLC_ROW(f_huffman_env_bal_3_0dB), |
| 111 | SBR_VLC_ROW(t_huffman_noise_3_0dB), |
| 112 | SBR_VLC_ROW(t_huffman_noise_bal_3_0dB), |
| 113 | }; |
| 114 | |
| 115 | // SBR VLC table initialization |
| 116 | SBR_INIT_VLC_STATIC(0, 1098); |
| 117 | SBR_INIT_VLC_STATIC(1, 1092); |
| 118 | SBR_INIT_VLC_STATIC(2, 768); |
| 119 | SBR_INIT_VLC_STATIC(3, 1026); |
| 120 | SBR_INIT_VLC_STATIC(4, 1058); |
| 121 | SBR_INIT_VLC_STATIC(5, 1052); |
| 122 | SBR_INIT_VLC_STATIC(6, 544); |
| 123 | SBR_INIT_VLC_STATIC(7, 544); |
| 124 | SBR_INIT_VLC_STATIC(8, 592); |
| 125 | SBR_INIT_VLC_STATIC(9, 512); |
| 126 | |
| 127 | aacsbr_tableinit(); |
| 128 | |
| 129 | ff_ps_init(); |
| 130 | } |
| 131 | |
| 132 | /** Places SBR in pure upsampling mode. */ |
| 133 | static void sbr_turnoff(SpectralBandReplication *sbr) { |
| 134 | sbr->start = 0; |
| 135 | // Init defults used in pure upsampling mode |
| 136 | sbr->kx[1] = 32; //Typo in spec, kx' inits to 32 |
| 137 | sbr->m[1] = 0; |
| 138 | // Reset values for first SBR header |
| 139 | sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1; |
| 140 | memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters)); |
| 141 | } |
| 142 | |
| 143 | av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr) |
| 144 | { |
| 145 | if(sbr->mdct.mdct_bits) |
| 146 | return; |
| 147 | sbr->kx[0] = sbr->kx[1]; |
| 148 | sbr_turnoff(sbr); |
| 149 | sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128); |
| 150 | sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128); |
| 151 | /* SBR requires samples to be scaled to +/-32768.0 to work correctly. |
| 152 | * mdct scale factors are adjusted to scale up from +/-1.0 at analysis |
| 153 | * and scale back down at synthesis. */ |
| 154 | ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0)); |
| 155 | ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0); |
| 156 | ff_ps_ctx_init(&sbr->ps); |
| 157 | ff_sbrdsp_init(&sbr->dsp); |
| 158 | aacsbr_func_ptr_init(&sbr->c); |
| 159 | } |
| 160 | |
| 161 | av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr) |
| 162 | { |
| 163 | ff_mdct_end(&sbr->mdct); |
| 164 | ff_mdct_end(&sbr->mdct_ana); |
| 165 | } |
| 166 | |
| 167 | static int qsort_comparison_function_int16(const void *a, const void *b) |
| 168 | { |
| 169 | return *(const int16_t *)a - *(const int16_t *)b; |
| 170 | } |
| 171 | |
| 172 | static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle) |
| 173 | { |
| 174 | int i; |
| 175 | for (i = 0; i <= last_el; i++) |
| 176 | if (table[i] == needle) |
| 177 | return 1; |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | /// Limiter Frequency Band Table (14496-3 sp04 p198) |
| 182 | static void sbr_make_f_tablelim(SpectralBandReplication *sbr) |
| 183 | { |
| 184 | int k; |
| 185 | if (sbr->bs_limiter_bands > 0) { |
| 186 | static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2) |
| 187 | 1.18509277094158210129f, //2^(0.49/2) |
| 188 | 1.11987160404675912501f }; //2^(0.49/3) |
| 189 | const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1]; |
| 190 | int16_t patch_borders[7]; |
| 191 | uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim; |
| 192 | |
| 193 | patch_borders[0] = sbr->kx[1]; |
| 194 | for (k = 1; k <= sbr->num_patches; k++) |
| 195 | patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1]; |
| 196 | |
| 197 | memcpy(sbr->f_tablelim, sbr->f_tablelow, |
| 198 | (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0])); |
| 199 | if (sbr->num_patches > 1) |
| 200 | memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1, |
| 201 | (sbr->num_patches - 1) * sizeof(patch_borders[0])); |
| 202 | |
| 203 | qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0], |
| 204 | sizeof(sbr->f_tablelim[0]), |
| 205 | qsort_comparison_function_int16); |
| 206 | |
| 207 | sbr->n_lim = sbr->n[0] + sbr->num_patches - 1; |
| 208 | while (out < sbr->f_tablelim + sbr->n_lim) { |
| 209 | if (*in >= *out * lim_bands_per_octave_warped) { |
| 210 | *++out = *in++; |
| 211 | } else if (*in == *out || |
| 212 | !in_table_int16(patch_borders, sbr->num_patches, *in)) { |
| 213 | in++; |
| 214 | sbr->n_lim--; |
| 215 | } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) { |
| 216 | *out = *in++; |
| 217 | sbr->n_lim--; |
| 218 | } else { |
| 219 | *++out = *in++; |
| 220 | } |
| 221 | } |
| 222 | } else { |
| 223 | sbr->f_tablelim[0] = sbr->f_tablelow[0]; |
| 224 | sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]]; |
| 225 | sbr->n_lim = 1; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb) |
| 230 | { |
| 231 | unsigned int cnt = get_bits_count(gb); |
| 232 | uint8_t bs_header_extra_1; |
| 233 | uint8_t bs_header_extra_2; |
| 234 | int old_bs_limiter_bands = sbr->bs_limiter_bands; |
| 235 | SpectrumParameters old_spectrum_params; |
| 236 | |
| 237 | sbr->start = 1; |
| 238 | |
| 239 | // Save last spectrum parameters variables to compare to new ones |
| 240 | memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)); |
| 241 | |
| 242 | sbr->bs_amp_res_header = get_bits1(gb); |
| 243 | sbr->spectrum_params.bs_start_freq = get_bits(gb, 4); |
| 244 | sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4); |
| 245 | sbr->spectrum_params.bs_xover_band = get_bits(gb, 3); |
| 246 | skip_bits(gb, 2); // bs_reserved |
| 247 | |
| 248 | bs_header_extra_1 = get_bits1(gb); |
| 249 | bs_header_extra_2 = get_bits1(gb); |
| 250 | |
| 251 | if (bs_header_extra_1) { |
| 252 | sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2); |
| 253 | sbr->spectrum_params.bs_alter_scale = get_bits1(gb); |
| 254 | sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2); |
| 255 | } else { |
| 256 | sbr->spectrum_params.bs_freq_scale = 2; |
| 257 | sbr->spectrum_params.bs_alter_scale = 1; |
| 258 | sbr->spectrum_params.bs_noise_bands = 2; |
| 259 | } |
| 260 | |
| 261 | // Check if spectrum parameters changed |
| 262 | if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters))) |
| 263 | sbr->reset = 1; |
| 264 | |
| 265 | if (bs_header_extra_2) { |
| 266 | sbr->bs_limiter_bands = get_bits(gb, 2); |
| 267 | sbr->bs_limiter_gains = get_bits(gb, 2); |
| 268 | sbr->bs_interpol_freq = get_bits1(gb); |
| 269 | sbr->bs_smoothing_mode = get_bits1(gb); |
| 270 | } else { |
| 271 | sbr->bs_limiter_bands = 2; |
| 272 | sbr->bs_limiter_gains = 2; |
| 273 | sbr->bs_interpol_freq = 1; |
| 274 | sbr->bs_smoothing_mode = 1; |
| 275 | } |
| 276 | |
| 277 | if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset) |
| 278 | sbr_make_f_tablelim(sbr); |
| 279 | |
| 280 | return get_bits_count(gb) - cnt; |
| 281 | } |
| 282 | |
| 283 | static int array_min_int16(const int16_t *array, int nel) |
| 284 | { |
| 285 | int i, min = array[0]; |
| 286 | for (i = 1; i < nel; i++) |
| 287 | min = FFMIN(array[i], min); |
| 288 | return min; |
| 289 | } |
| 290 | |
| 291 | static void make_bands(int16_t* bands, int start, int stop, int num_bands) |
| 292 | { |
| 293 | int k, previous, present; |
| 294 | float base, prod; |
| 295 | |
| 296 | base = powf((float)stop / start, 1.0f / num_bands); |
| 297 | prod = start; |
| 298 | previous = start; |
| 299 | |
| 300 | for (k = 0; k < num_bands-1; k++) { |
| 301 | prod *= base; |
| 302 | present = lrintf(prod); |
| 303 | bands[k] = present - previous; |
| 304 | previous = present; |
| 305 | } |
| 306 | bands[num_bands-1] = stop - previous; |
| 307 | } |
| 308 | |
| 309 | static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band) |
| 310 | { |
| 311 | // Requirements (14496-3 sp04 p205) |
| 312 | if (n_master <= 0) { |
| 313 | av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master); |
| 314 | return -1; |
| 315 | } |
| 316 | if (bs_xover_band >= n_master) { |
| 317 | av_log(avctx, AV_LOG_ERROR, |
| 318 | "Invalid bitstream, crossover band index beyond array bounds: %d\n", |
| 319 | bs_xover_band); |
| 320 | return -1; |
| 321 | } |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | /// Master Frequency Band Table (14496-3 sp04 p194) |
| 326 | static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr, |
| 327 | SpectrumParameters *spectrum) |
| 328 | { |
| 329 | unsigned int temp, max_qmf_subbands; |
| 330 | unsigned int start_min, stop_min; |
| 331 | int k; |
| 332 | const int8_t *sbr_offset_ptr; |
| 333 | int16_t stop_dk[13]; |
| 334 | |
| 335 | if (sbr->sample_rate < 32000) { |
| 336 | temp = 3000; |
| 337 | } else if (sbr->sample_rate < 64000) { |
| 338 | temp = 4000; |
| 339 | } else |
| 340 | temp = 5000; |
| 341 | |
| 342 | switch (sbr->sample_rate) { |
| 343 | case 16000: |
| 344 | sbr_offset_ptr = sbr_offset[0]; |
| 345 | break; |
| 346 | case 22050: |
| 347 | sbr_offset_ptr = sbr_offset[1]; |
| 348 | break; |
| 349 | case 24000: |
| 350 | sbr_offset_ptr = sbr_offset[2]; |
| 351 | break; |
| 352 | case 32000: |
| 353 | sbr_offset_ptr = sbr_offset[3]; |
| 354 | break; |
| 355 | case 44100: case 48000: case 64000: |
| 356 | sbr_offset_ptr = sbr_offset[4]; |
| 357 | break; |
| 358 | case 88200: case 96000: case 128000: case 176400: case 192000: |
| 359 | sbr_offset_ptr = sbr_offset[5]; |
| 360 | break; |
| 361 | default: |
| 362 | av_log(ac->avctx, AV_LOG_ERROR, |
| 363 | "Unsupported sample rate for SBR: %d\n", sbr->sample_rate); |
| 364 | return -1; |
| 365 | } |
| 366 | |
| 367 | start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate; |
| 368 | stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate; |
| 369 | |
| 370 | sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq]; |
| 371 | |
| 372 | if (spectrum->bs_stop_freq < 14) { |
| 373 | sbr->k[2] = stop_min; |
| 374 | make_bands(stop_dk, stop_min, 64, 13); |
| 375 | qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16); |
| 376 | for (k = 0; k < spectrum->bs_stop_freq; k++) |
| 377 | sbr->k[2] += stop_dk[k]; |
| 378 | } else if (spectrum->bs_stop_freq == 14) { |
| 379 | sbr->k[2] = 2*sbr->k[0]; |
| 380 | } else if (spectrum->bs_stop_freq == 15) { |
| 381 | sbr->k[2] = 3*sbr->k[0]; |
| 382 | } else { |
| 383 | av_log(ac->avctx, AV_LOG_ERROR, |
| 384 | "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq); |
| 385 | return -1; |
| 386 | } |
| 387 | sbr->k[2] = FFMIN(64, sbr->k[2]); |
| 388 | |
| 389 | // Requirements (14496-3 sp04 p205) |
| 390 | if (sbr->sample_rate <= 32000) { |
| 391 | max_qmf_subbands = 48; |
| 392 | } else if (sbr->sample_rate == 44100) { |
| 393 | max_qmf_subbands = 35; |
| 394 | } else if (sbr->sample_rate >= 48000) |
| 395 | max_qmf_subbands = 32; |
| 396 | else |
| 397 | av_assert0(0); |
| 398 | |
| 399 | if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) { |
| 400 | av_log(ac->avctx, AV_LOG_ERROR, |
| 401 | "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]); |
| 402 | return -1; |
| 403 | } |
| 404 | |
| 405 | if (!spectrum->bs_freq_scale) { |
| 406 | int dk, k2diff; |
| 407 | |
| 408 | dk = spectrum->bs_alter_scale + 1; |
| 409 | sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1; |
| 410 | if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band)) |
| 411 | return -1; |
| 412 | |
| 413 | for (k = 1; k <= sbr->n_master; k++) |
| 414 | sbr->f_master[k] = dk; |
| 415 | |
| 416 | k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk; |
| 417 | if (k2diff < 0) { |
| 418 | sbr->f_master[1]--; |
| 419 | sbr->f_master[2]-= (k2diff < -1); |
| 420 | } else if (k2diff) { |
| 421 | sbr->f_master[sbr->n_master]++; |
| 422 | } |
| 423 | |
| 424 | sbr->f_master[0] = sbr->k[0]; |
| 425 | for (k = 1; k <= sbr->n_master; k++) |
| 426 | sbr->f_master[k] += sbr->f_master[k - 1]; |
| 427 | |
| 428 | } else { |
| 429 | int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3} |
| 430 | int two_regions, num_bands_0; |
| 431 | int vdk0_max, vdk1_min; |
| 432 | int16_t vk0[49]; |
| 433 | |
| 434 | if (49 * sbr->k[2] > 110 * sbr->k[0]) { |
| 435 | two_regions = 1; |
| 436 | sbr->k[1] = 2 * sbr->k[0]; |
| 437 | } else { |
| 438 | two_regions = 0; |
| 439 | sbr->k[1] = sbr->k[2]; |
| 440 | } |
| 441 | |
| 442 | num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2; |
| 443 | |
| 444 | if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205) |
| 445 | av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0); |
| 446 | return -1; |
| 447 | } |
| 448 | |
| 449 | vk0[0] = 0; |
| 450 | |
| 451 | make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0); |
| 452 | |
| 453 | qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16); |
| 454 | vdk0_max = vk0[num_bands_0]; |
| 455 | |
| 456 | vk0[0] = sbr->k[0]; |
| 457 | for (k = 1; k <= num_bands_0; k++) { |
| 458 | if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205) |
| 459 | av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]); |
| 460 | return -1; |
| 461 | } |
| 462 | vk0[k] += vk0[k-1]; |
| 463 | } |
| 464 | |
| 465 | if (two_regions) { |
| 466 | int16_t vk1[49]; |
| 467 | float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f |
| 468 | : 1.0f; // bs_alter_scale = {0,1} |
| 469 | int num_bands_1 = lrintf(half_bands * invwarp * |
| 470 | log2f(sbr->k[2] / (float)sbr->k[1])) * 2; |
| 471 | |
| 472 | make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1); |
| 473 | |
| 474 | vdk1_min = array_min_int16(vk1 + 1, num_bands_1); |
| 475 | |
| 476 | if (vdk1_min < vdk0_max) { |
| 477 | int change; |
| 478 | qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16); |
| 479 | change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1); |
| 480 | vk1[1] += change; |
| 481 | vk1[num_bands_1] -= change; |
| 482 | } |
| 483 | |
| 484 | qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16); |
| 485 | |
| 486 | vk1[0] = sbr->k[1]; |
| 487 | for (k = 1; k <= num_bands_1; k++) { |
| 488 | if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205) |
| 489 | av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]); |
| 490 | return -1; |
| 491 | } |
| 492 | vk1[k] += vk1[k-1]; |
| 493 | } |
| 494 | |
| 495 | sbr->n_master = num_bands_0 + num_bands_1; |
| 496 | if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band)) |
| 497 | return -1; |
| 498 | memcpy(&sbr->f_master[0], vk0, |
| 499 | (num_bands_0 + 1) * sizeof(sbr->f_master[0])); |
| 500 | memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1, |
| 501 | num_bands_1 * sizeof(sbr->f_master[0])); |
| 502 | |
| 503 | } else { |
| 504 | sbr->n_master = num_bands_0; |
| 505 | if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band)) |
| 506 | return -1; |
| 507 | memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0])); |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46) |
| 515 | static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr) |
| 516 | { |
| 517 | int i, k, sb = 0; |
| 518 | int msb = sbr->k[0]; |
| 519 | int usb = sbr->kx[1]; |
| 520 | int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate; |
| 521 | |
| 522 | sbr->num_patches = 0; |
| 523 | |
| 524 | if (goal_sb < sbr->kx[1] + sbr->m[1]) { |
| 525 | for (k = 0; sbr->f_master[k] < goal_sb; k++) ; |
| 526 | } else |
| 527 | k = sbr->n_master; |
| 528 | |
| 529 | do { |
| 530 | int odd = 0; |
| 531 | for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) { |
| 532 | sb = sbr->f_master[i]; |
| 533 | odd = (sb + sbr->k[0]) & 1; |
| 534 | } |
| 535 | |
| 536 | // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5. |
| 537 | // After this check the final number of patches can still be six which is |
| 538 | // illegal however the Coding Technologies decoder check stream has a final |
| 539 | // count of 6 patches |
| 540 | if (sbr->num_patches > 5) { |
| 541 | av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches); |
| 542 | return -1; |
| 543 | } |
| 544 | |
| 545 | sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0); |
| 546 | sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches]; |
| 547 | |
| 548 | if (sbr->patch_num_subbands[sbr->num_patches] > 0) { |
| 549 | usb = sb; |
| 550 | msb = sb; |
| 551 | sbr->num_patches++; |
| 552 | } else |
| 553 | msb = sbr->kx[1]; |
| 554 | |
| 555 | if (sbr->f_master[k] - sb < 3) |
| 556 | k = sbr->n_master; |
| 557 | } while (sb != sbr->kx[1] + sbr->m[1]); |
| 558 | |
| 559 | if (sbr->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches-1] < 3) |
| 560 | sbr->num_patches--; |
| 561 | |
| 562 | return 0; |
| 563 | } |
| 564 | |
| 565 | /// Derived Frequency Band Tables (14496-3 sp04 p197) |
| 566 | static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr) |
| 567 | { |
| 568 | int k, temp; |
| 569 | |
| 570 | sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band; |
| 571 | sbr->n[0] = (sbr->n[1] + 1) >> 1; |
| 572 | |
| 573 | memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band], |
| 574 | (sbr->n[1] + 1) * sizeof(sbr->f_master[0])); |
| 575 | sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0]; |
| 576 | sbr->kx[1] = sbr->f_tablehigh[0]; |
| 577 | |
| 578 | // Requirements (14496-3 sp04 p205) |
| 579 | if (sbr->kx[1] + sbr->m[1] > 64) { |
| 580 | av_log(ac->avctx, AV_LOG_ERROR, |
| 581 | "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]); |
| 582 | return -1; |
| 583 | } |
| 584 | if (sbr->kx[1] > 32) { |
| 585 | av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]); |
| 586 | return -1; |
| 587 | } |
| 588 | |
| 589 | sbr->f_tablelow[0] = sbr->f_tablehigh[0]; |
| 590 | temp = sbr->n[1] & 1; |
| 591 | for (k = 1; k <= sbr->n[0]; k++) |
| 592 | sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp]; |
| 593 | |
| 594 | sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands * |
| 595 | log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3 |
| 596 | if (sbr->n_q > 5) { |
| 597 | av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q); |
| 598 | return -1; |
| 599 | } |
| 600 | |
| 601 | sbr->f_tablenoise[0] = sbr->f_tablelow[0]; |
| 602 | temp = 0; |
| 603 | for (k = 1; k <= sbr->n_q; k++) { |
| 604 | temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k); |
| 605 | sbr->f_tablenoise[k] = sbr->f_tablelow[temp]; |
| 606 | } |
| 607 | |
| 608 | if (sbr_hf_calc_npatches(ac, sbr) < 0) |
| 609 | return -1; |
| 610 | |
| 611 | sbr_make_f_tablelim(sbr); |
| 612 | |
| 613 | sbr->data[0].f_indexnoise = 0; |
| 614 | sbr->data[1].f_indexnoise = 0; |
| 615 | |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec, |
| 620 | int elements) |
| 621 | { |
| 622 | int i; |
| 623 | for (i = 0; i < elements; i++) { |
| 624 | vec[i] = get_bits1(gb); |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | /** ceil(log2(index+1)) */ |
| 629 | static const int8_t ceil_log2[] = { |
| 630 | 0, 1, 2, 2, 3, 3, |
| 631 | }; |
| 632 | |
| 633 | static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, |
| 634 | GetBitContext *gb, SBRData *ch_data) |
| 635 | { |
| 636 | int i; |
| 637 | unsigned bs_pointer = 0; |
| 638 | // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots |
| 639 | int abs_bord_trail = 16; |
| 640 | int num_rel_lead, num_rel_trail; |
| 641 | unsigned bs_num_env_old = ch_data->bs_num_env; |
| 642 | |
| 643 | ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env]; |
| 644 | ch_data->bs_amp_res = sbr->bs_amp_res_header; |
| 645 | ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old]; |
| 646 | |
| 647 | switch (ch_data->bs_frame_class = get_bits(gb, 2)) { |
| 648 | case FIXFIX: |
| 649 | ch_data->bs_num_env = 1 << get_bits(gb, 2); |
| 650 | num_rel_lead = ch_data->bs_num_env - 1; |
| 651 | if (ch_data->bs_num_env == 1) |
| 652 | ch_data->bs_amp_res = 0; |
| 653 | |
| 654 | if (ch_data->bs_num_env > 4) { |
| 655 | av_log(ac->avctx, AV_LOG_ERROR, |
| 656 | "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n", |
| 657 | ch_data->bs_num_env); |
| 658 | return -1; |
| 659 | } |
| 660 | |
| 661 | ch_data->t_env[0] = 0; |
| 662 | ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 663 | |
| 664 | abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) / |
| 665 | ch_data->bs_num_env; |
| 666 | for (i = 0; i < num_rel_lead; i++) |
| 667 | ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail; |
| 668 | |
| 669 | ch_data->bs_freq_res[1] = get_bits1(gb); |
| 670 | for (i = 1; i < ch_data->bs_num_env; i++) |
| 671 | ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1]; |
| 672 | break; |
| 673 | case FIXVAR: |
| 674 | abs_bord_trail += get_bits(gb, 2); |
| 675 | num_rel_trail = get_bits(gb, 2); |
| 676 | ch_data->bs_num_env = num_rel_trail + 1; |
| 677 | ch_data->t_env[0] = 0; |
| 678 | ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 679 | |
| 680 | for (i = 0; i < num_rel_trail; i++) |
| 681 | ch_data->t_env[ch_data->bs_num_env - 1 - i] = |
| 682 | ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; |
| 683 | |
| 684 | bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); |
| 685 | |
| 686 | for (i = 0; i < ch_data->bs_num_env; i++) |
| 687 | ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb); |
| 688 | break; |
| 689 | case VARFIX: |
| 690 | ch_data->t_env[0] = get_bits(gb, 2); |
| 691 | num_rel_lead = get_bits(gb, 2); |
| 692 | ch_data->bs_num_env = num_rel_lead + 1; |
| 693 | ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 694 | |
| 695 | for (i = 0; i < num_rel_lead; i++) |
| 696 | ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; |
| 697 | |
| 698 | bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); |
| 699 | |
| 700 | get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env); |
| 701 | break; |
| 702 | case VARVAR: |
| 703 | ch_data->t_env[0] = get_bits(gb, 2); |
| 704 | abs_bord_trail += get_bits(gb, 2); |
| 705 | num_rel_lead = get_bits(gb, 2); |
| 706 | num_rel_trail = get_bits(gb, 2); |
| 707 | ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1; |
| 708 | |
| 709 | if (ch_data->bs_num_env > 5) { |
| 710 | av_log(ac->avctx, AV_LOG_ERROR, |
| 711 | "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n", |
| 712 | ch_data->bs_num_env); |
| 713 | return -1; |
| 714 | } |
| 715 | |
| 716 | ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 717 | |
| 718 | for (i = 0; i < num_rel_lead; i++) |
| 719 | ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; |
| 720 | for (i = 0; i < num_rel_trail; i++) |
| 721 | ch_data->t_env[ch_data->bs_num_env - 1 - i] = |
| 722 | ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; |
| 723 | |
| 724 | bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); |
| 725 | |
| 726 | get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env); |
| 727 | break; |
| 728 | } |
| 729 | |
| 730 | if (bs_pointer > ch_data->bs_num_env + 1) { |
| 731 | av_log(ac->avctx, AV_LOG_ERROR, |
| 732 | "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n", |
| 733 | bs_pointer); |
| 734 | return -1; |
| 735 | } |
| 736 | |
| 737 | for (i = 1; i <= ch_data->bs_num_env; i++) { |
| 738 | if (ch_data->t_env[i-1] > ch_data->t_env[i]) { |
| 739 | av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n"); |
| 740 | return -1; |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1; |
| 745 | |
| 746 | ch_data->t_q[0] = ch_data->t_env[0]; |
| 747 | ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env]; |
| 748 | if (ch_data->bs_num_noise > 1) { |
| 749 | unsigned int idx; |
| 750 | if (ch_data->bs_frame_class == FIXFIX) { |
| 751 | idx = ch_data->bs_num_env >> 1; |
| 752 | } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR |
| 753 | idx = ch_data->bs_num_env - FFMAX((int)bs_pointer - 1, 1); |
| 754 | } else { // VARFIX |
| 755 | if (!bs_pointer) |
| 756 | idx = 1; |
| 757 | else if (bs_pointer == 1) |
| 758 | idx = ch_data->bs_num_env - 1; |
| 759 | else // bs_pointer > 1 |
| 760 | idx = bs_pointer - 1; |
| 761 | } |
| 762 | ch_data->t_q[1] = ch_data->t_env[idx]; |
| 763 | } |
| 764 | |
| 765 | ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev |
| 766 | ch_data->e_a[1] = -1; |
| 767 | if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0 |
| 768 | ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer; |
| 769 | } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1 |
| 770 | ch_data->e_a[1] = bs_pointer - 1; |
| 771 | |
| 772 | return 0; |
| 773 | } |
| 774 | |
| 775 | static void copy_sbr_grid(SBRData *dst, const SBRData *src) { |
| 776 | //These variables are saved from the previous frame rather than copied |
| 777 | dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env]; |
| 778 | dst->t_env_num_env_old = dst->t_env[dst->bs_num_env]; |
| 779 | dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env); |
| 780 | |
| 781 | //These variables are read from the bitstream and therefore copied |
| 782 | memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res)); |
| 783 | memcpy(dst->t_env, src->t_env, sizeof(dst->t_env)); |
| 784 | memcpy(dst->t_q, src->t_q, sizeof(dst->t_q)); |
| 785 | dst->bs_num_env = src->bs_num_env; |
| 786 | dst->bs_amp_res = src->bs_amp_res; |
| 787 | dst->bs_num_noise = src->bs_num_noise; |
| 788 | dst->bs_frame_class = src->bs_frame_class; |
| 789 | dst->e_a[1] = src->e_a[1]; |
| 790 | } |
| 791 | |
| 792 | /// Read how the envelope and noise floor data is delta coded |
| 793 | static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb, |
| 794 | SBRData *ch_data) |
| 795 | { |
| 796 | get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env); |
| 797 | get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise); |
| 798 | } |
| 799 | |
| 800 | /// Read inverse filtering data |
| 801 | static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb, |
| 802 | SBRData *ch_data) |
| 803 | { |
| 804 | int i; |
| 805 | |
| 806 | memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t)); |
| 807 | for (i = 0; i < sbr->n_q; i++) |
| 808 | ch_data->bs_invf_mode[0][i] = get_bits(gb, 2); |
| 809 | } |
| 810 | |
| 811 | static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb, |
| 812 | SBRData *ch_data, int ch) |
| 813 | { |
| 814 | int bits; |
| 815 | int i, j, k; |
| 816 | VLC_TYPE (*t_huff)[2], (*f_huff)[2]; |
| 817 | int t_lav, f_lav; |
| 818 | const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1; |
| 819 | const int odd = sbr->n[1] & 1; |
| 820 | |
| 821 | if (sbr->bs_coupling && ch) { |
| 822 | if (ch_data->bs_amp_res) { |
| 823 | bits = 5; |
| 824 | t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table; |
| 825 | t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB]; |
| 826 | f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table; |
| 827 | f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB]; |
| 828 | } else { |
| 829 | bits = 6; |
| 830 | t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table; |
| 831 | t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB]; |
| 832 | f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table; |
| 833 | f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB]; |
| 834 | } |
| 835 | } else { |
| 836 | if (ch_data->bs_amp_res) { |
| 837 | bits = 6; |
| 838 | t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table; |
| 839 | t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB]; |
| 840 | f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table; |
| 841 | f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB]; |
| 842 | } else { |
| 843 | bits = 7; |
| 844 | t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table; |
| 845 | t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB]; |
| 846 | f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table; |
| 847 | f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB]; |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | for (i = 0; i < ch_data->bs_num_env; i++) { |
| 852 | if (ch_data->bs_df_env[i]) { |
| 853 | // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame |
| 854 | if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) { |
| 855 | for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) |
| 856 | ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); |
| 857 | } else if (ch_data->bs_freq_res[i + 1]) { |
| 858 | for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) { |
| 859 | k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1] |
| 860 | ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); |
| 861 | } |
| 862 | } else { |
| 863 | for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) { |
| 864 | k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j] |
| 865 | ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); |
| 866 | } |
| 867 | } |
| 868 | } else { |
| 869 | ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance |
| 870 | for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) |
| 871 | ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav); |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | //assign 0th elements of env_facs from last elements |
| 876 | memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env], |
| 877 | sizeof(ch_data->env_facs[0])); |
| 878 | } |
| 879 | |
| 880 | static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb, |
| 881 | SBRData *ch_data, int ch) |
| 882 | { |
| 883 | int i, j; |
| 884 | VLC_TYPE (*t_huff)[2], (*f_huff)[2]; |
| 885 | int t_lav, f_lav; |
| 886 | int delta = (ch == 1 && sbr->bs_coupling == 1) + 1; |
| 887 | |
| 888 | if (sbr->bs_coupling && ch) { |
| 889 | t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table; |
| 890 | t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB]; |
| 891 | f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table; |
| 892 | f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB]; |
| 893 | } else { |
| 894 | t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table; |
| 895 | t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB]; |
| 896 | f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table; |
| 897 | f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB]; |
| 898 | } |
| 899 | |
| 900 | for (i = 0; i < ch_data->bs_num_noise; i++) { |
| 901 | if (ch_data->bs_df_noise[i]) { |
| 902 | for (j = 0; j < sbr->n_q; j++) |
| 903 | ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav); |
| 904 | } else { |
| 905 | ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level |
| 906 | for (j = 1; j < sbr->n_q; j++) |
| 907 | ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav); |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | //assign 0th elements of noise_facs from last elements |
| 912 | memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise], |
| 913 | sizeof(ch_data->noise_facs[0])); |
| 914 | } |
| 915 | |
| 916 | static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, |
| 917 | GetBitContext *gb, |
| 918 | int bs_extension_id, int *num_bits_left) |
| 919 | { |
| 920 | switch (bs_extension_id) { |
| 921 | case EXTENSION_ID_PS: |
| 922 | if (!ac->oc[1].m4ac.ps) { |
| 923 | av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n"); |
| 924 | skip_bits_long(gb, *num_bits_left); // bs_fill_bits |
| 925 | *num_bits_left = 0; |
| 926 | } else { |
| 927 | #if 1 |
| 928 | *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left); |
| 929 | ac->avctx->profile = FF_PROFILE_AAC_HE_V2; |
| 930 | #else |
| 931 | avpriv_report_missing_feature(ac->avctx, "Parametric Stereo"); |
| 932 | skip_bits_long(gb, *num_bits_left); // bs_fill_bits |
| 933 | *num_bits_left = 0; |
| 934 | #endif |
| 935 | } |
| 936 | break; |
| 937 | default: |
| 938 | // some files contain 0-padding |
| 939 | if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left)) |
| 940 | avpriv_request_sample(ac->avctx, "Reserved SBR extensions"); |
| 941 | skip_bits_long(gb, *num_bits_left); // bs_fill_bits |
| 942 | *num_bits_left = 0; |
| 943 | break; |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | static int read_sbr_single_channel_element(AACContext *ac, |
| 948 | SpectralBandReplication *sbr, |
| 949 | GetBitContext *gb) |
| 950 | { |
| 951 | if (get_bits1(gb)) // bs_data_extra |
| 952 | skip_bits(gb, 4); // bs_reserved |
| 953 | |
| 954 | if (read_sbr_grid(ac, sbr, gb, &sbr->data[0])) |
| 955 | return -1; |
| 956 | read_sbr_dtdf(sbr, gb, &sbr->data[0]); |
| 957 | read_sbr_invf(sbr, gb, &sbr->data[0]); |
| 958 | read_sbr_envelope(sbr, gb, &sbr->data[0], 0); |
| 959 | read_sbr_noise(sbr, gb, &sbr->data[0], 0); |
| 960 | |
| 961 | if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) |
| 962 | get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); |
| 963 | |
| 964 | return 0; |
| 965 | } |
| 966 | |
| 967 | static int read_sbr_channel_pair_element(AACContext *ac, |
| 968 | SpectralBandReplication *sbr, |
| 969 | GetBitContext *gb) |
| 970 | { |
| 971 | if (get_bits1(gb)) // bs_data_extra |
| 972 | skip_bits(gb, 8); // bs_reserved |
| 973 | |
| 974 | if ((sbr->bs_coupling = get_bits1(gb))) { |
| 975 | if (read_sbr_grid(ac, sbr, gb, &sbr->data[0])) |
| 976 | return -1; |
| 977 | copy_sbr_grid(&sbr->data[1], &sbr->data[0]); |
| 978 | read_sbr_dtdf(sbr, gb, &sbr->data[0]); |
| 979 | read_sbr_dtdf(sbr, gb, &sbr->data[1]); |
| 980 | read_sbr_invf(sbr, gb, &sbr->data[0]); |
| 981 | memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0])); |
| 982 | memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0])); |
| 983 | read_sbr_envelope(sbr, gb, &sbr->data[0], 0); |
| 984 | read_sbr_noise(sbr, gb, &sbr->data[0], 0); |
| 985 | read_sbr_envelope(sbr, gb, &sbr->data[1], 1); |
| 986 | read_sbr_noise(sbr, gb, &sbr->data[1], 1); |
| 987 | } else { |
| 988 | if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) || |
| 989 | read_sbr_grid(ac, sbr, gb, &sbr->data[1])) |
| 990 | return -1; |
| 991 | read_sbr_dtdf(sbr, gb, &sbr->data[0]); |
| 992 | read_sbr_dtdf(sbr, gb, &sbr->data[1]); |
| 993 | read_sbr_invf(sbr, gb, &sbr->data[0]); |
| 994 | read_sbr_invf(sbr, gb, &sbr->data[1]); |
| 995 | read_sbr_envelope(sbr, gb, &sbr->data[0], 0); |
| 996 | read_sbr_envelope(sbr, gb, &sbr->data[1], 1); |
| 997 | read_sbr_noise(sbr, gb, &sbr->data[0], 0); |
| 998 | read_sbr_noise(sbr, gb, &sbr->data[1], 1); |
| 999 | } |
| 1000 | |
| 1001 | if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) |
| 1002 | get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); |
| 1003 | if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb))) |
| 1004 | get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]); |
| 1005 | |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr, |
| 1010 | GetBitContext *gb, int id_aac) |
| 1011 | { |
| 1012 | unsigned int cnt = get_bits_count(gb); |
| 1013 | |
| 1014 | if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) { |
| 1015 | if (read_sbr_single_channel_element(ac, sbr, gb)) { |
| 1016 | sbr_turnoff(sbr); |
| 1017 | return get_bits_count(gb) - cnt; |
| 1018 | } |
| 1019 | } else if (id_aac == TYPE_CPE) { |
| 1020 | if (read_sbr_channel_pair_element(ac, sbr, gb)) { |
| 1021 | sbr_turnoff(sbr); |
| 1022 | return get_bits_count(gb) - cnt; |
| 1023 | } |
| 1024 | } else { |
| 1025 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1026 | "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac); |
| 1027 | sbr_turnoff(sbr); |
| 1028 | return get_bits_count(gb) - cnt; |
| 1029 | } |
| 1030 | if (get_bits1(gb)) { // bs_extended_data |
| 1031 | int num_bits_left = get_bits(gb, 4); // bs_extension_size |
| 1032 | if (num_bits_left == 15) |
| 1033 | num_bits_left += get_bits(gb, 8); // bs_esc_count |
| 1034 | |
| 1035 | num_bits_left <<= 3; |
| 1036 | while (num_bits_left > 7) { |
| 1037 | num_bits_left -= 2; |
| 1038 | read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id |
| 1039 | } |
| 1040 | if (num_bits_left < 0) { |
| 1041 | av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n"); |
| 1042 | } |
| 1043 | if (num_bits_left > 0) |
| 1044 | skip_bits(gb, num_bits_left); |
| 1045 | } |
| 1046 | |
| 1047 | return get_bits_count(gb) - cnt; |
| 1048 | } |
| 1049 | |
| 1050 | static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr) |
| 1051 | { |
| 1052 | int err; |
| 1053 | err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params); |
| 1054 | if (err >= 0) |
| 1055 | err = sbr_make_f_derived(ac, sbr); |
| 1056 | if (err < 0) { |
| 1057 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1058 | "SBR reset failed. Switching SBR to pure upsampling mode.\n"); |
| 1059 | sbr_turnoff(sbr); |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | /** |
| 1064 | * Decode Spectral Band Replication extension data; reference: table 4.55. |
| 1065 | * |
| 1066 | * @param crc flag indicating the presence of CRC checksum |
| 1067 | * @param cnt length of TYPE_FIL syntactic element in bytes |
| 1068 | * |
| 1069 | * @return Returns number of bytes consumed from the TYPE_FIL element. |
| 1070 | */ |
| 1071 | int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, |
| 1072 | GetBitContext *gb_host, int crc, int cnt, int id_aac) |
| 1073 | { |
| 1074 | unsigned int num_sbr_bits = 0, num_align_bits; |
| 1075 | unsigned bytes_read; |
| 1076 | GetBitContext gbc = *gb_host, *gb = &gbc; |
| 1077 | skip_bits_long(gb_host, cnt*8 - 4); |
| 1078 | |
| 1079 | sbr->reset = 0; |
| 1080 | |
| 1081 | if (!sbr->sample_rate) |
| 1082 | sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support |
| 1083 | if (!ac->oc[1].m4ac.ext_sample_rate) |
| 1084 | ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate; |
| 1085 | |
| 1086 | if (crc) { |
| 1087 | skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check |
| 1088 | num_sbr_bits += 10; |
| 1089 | } |
| 1090 | |
| 1091 | //Save some state from the previous frame. |
| 1092 | sbr->kx[0] = sbr->kx[1]; |
| 1093 | sbr->m[0] = sbr->m[1]; |
| 1094 | sbr->kx_and_m_pushed = 1; |
| 1095 | |
| 1096 | num_sbr_bits++; |
| 1097 | if (get_bits1(gb)) // bs_header_flag |
| 1098 | num_sbr_bits += read_sbr_header(sbr, gb); |
| 1099 | |
| 1100 | if (sbr->reset) |
| 1101 | sbr_reset(ac, sbr); |
| 1102 | |
| 1103 | if (sbr->start) |
| 1104 | num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac); |
| 1105 | |
| 1106 | num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7; |
| 1107 | bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3); |
| 1108 | |
| 1109 | if (bytes_read > cnt) { |
| 1110 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1111 | "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read); |
| 1112 | } |
| 1113 | return cnt; |
| 1114 | } |
| 1115 | |
| 1116 | /// Dequantization and stereo decoding (14496-3 sp04 p203) |
| 1117 | static void sbr_dequant(SpectralBandReplication *sbr, int id_aac) |
| 1118 | { |
| 1119 | int k, e; |
| 1120 | int ch; |
| 1121 | |
| 1122 | if (id_aac == TYPE_CPE && sbr->bs_coupling) { |
| 1123 | float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f; |
| 1124 | float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f; |
| 1125 | for (e = 1; e <= sbr->data[0].bs_num_env; e++) { |
| 1126 | for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) { |
| 1127 | float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f); |
| 1128 | float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha); |
| 1129 | float fac; |
| 1130 | if (temp1 > 1E20) { |
| 1131 | av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n"); |
| 1132 | temp1 = 1; |
| 1133 | } |
| 1134 | fac = temp1 / (1.0f + temp2); |
| 1135 | sbr->data[0].env_facs[e][k] = fac; |
| 1136 | sbr->data[1].env_facs[e][k] = fac * temp2; |
| 1137 | } |
| 1138 | } |
| 1139 | for (e = 1; e <= sbr->data[0].bs_num_noise; e++) { |
| 1140 | for (k = 0; k < sbr->n_q; k++) { |
| 1141 | float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1); |
| 1142 | float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]); |
| 1143 | float fac; |
| 1144 | if (temp1 > 1E20) { |
| 1145 | av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n"); |
| 1146 | temp1 = 1; |
| 1147 | } |
| 1148 | fac = temp1 / (1.0f + temp2); |
| 1149 | sbr->data[0].noise_facs[e][k] = fac; |
| 1150 | sbr->data[1].noise_facs[e][k] = fac * temp2; |
| 1151 | } |
| 1152 | } |
| 1153 | } else { // SCE or one non-coupled CPE |
| 1154 | for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) { |
| 1155 | float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f; |
| 1156 | for (e = 1; e <= sbr->data[ch].bs_num_env; e++) |
| 1157 | for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){ |
| 1158 | sbr->data[ch].env_facs[e][k] = |
| 1159 | exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f); |
| 1160 | if (sbr->data[ch].env_facs[e][k] > 1E20) { |
| 1161 | av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n"); |
| 1162 | sbr->data[ch].env_facs[e][k] = 1; |
| 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | for (e = 1; e <= sbr->data[ch].bs_num_noise; e++) |
| 1167 | for (k = 0; k < sbr->n_q; k++) |
| 1168 | sbr->data[ch].noise_facs[e][k] = |
| 1169 | exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]); |
| 1170 | } |
| 1171 | } |
| 1172 | } |
| 1173 | |
| 1174 | /** |
| 1175 | * Analysis QMF Bank (14496-3 sp04 p206) |
| 1176 | * |
| 1177 | * @param x pointer to the beginning of the first sample window |
| 1178 | * @param W array of complex-valued samples split into subbands |
| 1179 | */ |
| 1180 | #ifndef sbr_qmf_analysis |
| 1181 | static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct, |
| 1182 | SBRDSPContext *sbrdsp, const float *in, float *x, |
| 1183 | float z[320], float W[2][32][32][2], int buf_idx) |
| 1184 | { |
| 1185 | int i; |
| 1186 | memcpy(x , x+1024, (320-32)*sizeof(x[0])); |
| 1187 | memcpy(x+288, in, 1024*sizeof(x[0])); |
| 1188 | for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames |
| 1189 | // are not supported |
| 1190 | dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320); |
| 1191 | sbrdsp->sum64x5(z); |
| 1192 | sbrdsp->qmf_pre_shuffle(z); |
| 1193 | mdct->imdct_half(mdct, z, z+64); |
| 1194 | sbrdsp->qmf_post_shuffle(W[buf_idx][i], z); |
| 1195 | x += 32; |
| 1196 | } |
| 1197 | } |
| 1198 | #endif |
| 1199 | |
| 1200 | /** |
| 1201 | * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank |
| 1202 | * (14496-3 sp04 p206) |
| 1203 | */ |
| 1204 | #ifndef sbr_qmf_synthesis |
| 1205 | static void sbr_qmf_synthesis(FFTContext *mdct, |
| 1206 | SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp, |
| 1207 | float *out, float X[2][38][64], |
| 1208 | float mdct_buf[2][64], |
| 1209 | float *v0, int *v_off, const unsigned int div) |
| 1210 | { |
| 1211 | int i, n; |
| 1212 | const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us; |
| 1213 | const int step = 128 >> div; |
| 1214 | float *v; |
| 1215 | for (i = 0; i < 32; i++) { |
| 1216 | if (*v_off < step) { |
| 1217 | int saved_samples = (1280 - 128) >> div; |
| 1218 | memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float)); |
| 1219 | *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step; |
| 1220 | } else { |
| 1221 | *v_off -= step; |
| 1222 | } |
| 1223 | v = v0 + *v_off; |
| 1224 | if (div) { |
| 1225 | for (n = 0; n < 32; n++) { |
| 1226 | X[0][i][ n] = -X[0][i][n]; |
| 1227 | X[0][i][32+n] = X[1][i][31-n]; |
| 1228 | } |
| 1229 | mdct->imdct_half(mdct, mdct_buf[0], X[0][i]); |
| 1230 | sbrdsp->qmf_deint_neg(v, mdct_buf[0]); |
| 1231 | } else { |
| 1232 | sbrdsp->neg_odd_64(X[1][i]); |
| 1233 | mdct->imdct_half(mdct, mdct_buf[0], X[0][i]); |
| 1234 | mdct->imdct_half(mdct, mdct_buf[1], X[1][i]); |
| 1235 | sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]); |
| 1236 | } |
| 1237 | dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div); |
| 1238 | dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div); |
| 1239 | dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div); |
| 1240 | dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div); |
| 1241 | dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div); |
| 1242 | dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div); |
| 1243 | dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div); |
| 1244 | dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div); |
| 1245 | dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div); |
| 1246 | dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div); |
| 1247 | out += 64 >> div; |
| 1248 | } |
| 1249 | } |
| 1250 | #endif |
| 1251 | |
| 1252 | /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering |
| 1253 | * (14496-3 sp04 p214) |
| 1254 | * Warning: This routine does not seem numerically stable. |
| 1255 | */ |
| 1256 | static void sbr_hf_inverse_filter(SBRDSPContext *dsp, |
| 1257 | float (*alpha0)[2], float (*alpha1)[2], |
| 1258 | const float X_low[32][40][2], int k0) |
| 1259 | { |
| 1260 | int k; |
| 1261 | for (k = 0; k < k0; k++) { |
| 1262 | LOCAL_ALIGNED_16(float, phi, [3], [2][2]); |
| 1263 | float dk; |
| 1264 | |
| 1265 | dsp->autocorrelate(X_low[k], phi); |
| 1266 | |
| 1267 | dk = phi[2][1][0] * phi[1][0][0] - |
| 1268 | (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f; |
| 1269 | |
| 1270 | if (!dk) { |
| 1271 | alpha1[k][0] = 0; |
| 1272 | alpha1[k][1] = 0; |
| 1273 | } else { |
| 1274 | float temp_real, temp_im; |
| 1275 | temp_real = phi[0][0][0] * phi[1][1][0] - |
| 1276 | phi[0][0][1] * phi[1][1][1] - |
| 1277 | phi[0][1][0] * phi[1][0][0]; |
| 1278 | temp_im = phi[0][0][0] * phi[1][1][1] + |
| 1279 | phi[0][0][1] * phi[1][1][0] - |
| 1280 | phi[0][1][1] * phi[1][0][0]; |
| 1281 | |
| 1282 | alpha1[k][0] = temp_real / dk; |
| 1283 | alpha1[k][1] = temp_im / dk; |
| 1284 | } |
| 1285 | |
| 1286 | if (!phi[1][0][0]) { |
| 1287 | alpha0[k][0] = 0; |
| 1288 | alpha0[k][1] = 0; |
| 1289 | } else { |
| 1290 | float temp_real, temp_im; |
| 1291 | temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] + |
| 1292 | alpha1[k][1] * phi[1][1][1]; |
| 1293 | temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] - |
| 1294 | alpha1[k][0] * phi[1][1][1]; |
| 1295 | |
| 1296 | alpha0[k][0] = -temp_real / phi[1][0][0]; |
| 1297 | alpha0[k][1] = -temp_im / phi[1][0][0]; |
| 1298 | } |
| 1299 | |
| 1300 | if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f || |
| 1301 | alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) { |
| 1302 | alpha1[k][0] = 0; |
| 1303 | alpha1[k][1] = 0; |
| 1304 | alpha0[k][0] = 0; |
| 1305 | alpha0[k][1] = 0; |
| 1306 | } |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | /// Chirp Factors (14496-3 sp04 p214) |
| 1311 | static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data) |
| 1312 | { |
| 1313 | int i; |
| 1314 | float new_bw; |
| 1315 | static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f }; |
| 1316 | |
| 1317 | for (i = 0; i < sbr->n_q; i++) { |
| 1318 | if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) { |
| 1319 | new_bw = 0.6f; |
| 1320 | } else |
| 1321 | new_bw = bw_tab[ch_data->bs_invf_mode[0][i]]; |
| 1322 | |
| 1323 | if (new_bw < ch_data->bw_array[i]) { |
| 1324 | new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i]; |
| 1325 | } else |
| 1326 | new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i]; |
| 1327 | ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw; |
| 1328 | } |
| 1329 | } |
| 1330 | |
| 1331 | /// Generate the subband filtered lowband |
| 1332 | static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr, |
| 1333 | float X_low[32][40][2], const float W[2][32][32][2], |
| 1334 | int buf_idx) |
| 1335 | { |
| 1336 | int i, k; |
| 1337 | const int t_HFGen = 8; |
| 1338 | const int i_f = 32; |
| 1339 | memset(X_low, 0, 32*sizeof(*X_low)); |
| 1340 | for (k = 0; k < sbr->kx[1]; k++) { |
| 1341 | for (i = t_HFGen; i < i_f + t_HFGen; i++) { |
| 1342 | X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0]; |
| 1343 | X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1]; |
| 1344 | } |
| 1345 | } |
| 1346 | buf_idx = 1-buf_idx; |
| 1347 | for (k = 0; k < sbr->kx[0]; k++) { |
| 1348 | for (i = 0; i < t_HFGen; i++) { |
| 1349 | X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0]; |
| 1350 | X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1]; |
| 1351 | } |
| 1352 | } |
| 1353 | return 0; |
| 1354 | } |
| 1355 | |
| 1356 | /// High Frequency Generator (14496-3 sp04 p215) |
| 1357 | static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr, |
| 1358 | float X_high[64][40][2], const float X_low[32][40][2], |
| 1359 | const float (*alpha0)[2], const float (*alpha1)[2], |
| 1360 | const float bw_array[5], const uint8_t *t_env, |
| 1361 | int bs_num_env) |
| 1362 | { |
| 1363 | int j, x; |
| 1364 | int g = 0; |
| 1365 | int k = sbr->kx[1]; |
| 1366 | for (j = 0; j < sbr->num_patches; j++) { |
| 1367 | for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) { |
| 1368 | const int p = sbr->patch_start_subband[j] + x; |
| 1369 | while (g <= sbr->n_q && k >= sbr->f_tablenoise[g]) |
| 1370 | g++; |
| 1371 | g--; |
| 1372 | |
| 1373 | if (g < 0) { |
| 1374 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1375 | "ERROR : no subband found for frequency %d\n", k); |
| 1376 | return -1; |
| 1377 | } |
| 1378 | |
| 1379 | sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET, |
| 1380 | X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET, |
| 1381 | alpha0[p], alpha1[p], bw_array[g], |
| 1382 | 2 * t_env[0], 2 * t_env[bs_num_env]); |
| 1383 | } |
| 1384 | } |
| 1385 | if (k < sbr->m[1] + sbr->kx[1]) |
| 1386 | memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high)); |
| 1387 | |
| 1388 | return 0; |
| 1389 | } |
| 1390 | |
| 1391 | /// Generate the subband filtered lowband |
| 1392 | static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64], |
| 1393 | const float Y0[38][64][2], const float Y1[38][64][2], |
| 1394 | const float X_low[32][40][2], int ch) |
| 1395 | { |
| 1396 | int k, i; |
| 1397 | const int i_f = 32; |
| 1398 | const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0); |
| 1399 | memset(X, 0, 2*sizeof(*X)); |
| 1400 | for (k = 0; k < sbr->kx[0]; k++) { |
| 1401 | for (i = 0; i < i_Temp; i++) { |
| 1402 | X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0]; |
| 1403 | X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1]; |
| 1404 | } |
| 1405 | } |
| 1406 | for (; k < sbr->kx[0] + sbr->m[0]; k++) { |
| 1407 | for (i = 0; i < i_Temp; i++) { |
| 1408 | X[0][i][k] = Y0[i + i_f][k][0]; |
| 1409 | X[1][i][k] = Y0[i + i_f][k][1]; |
| 1410 | } |
| 1411 | } |
| 1412 | |
| 1413 | for (k = 0; k < sbr->kx[1]; k++) { |
| 1414 | for (i = i_Temp; i < 38; i++) { |
| 1415 | X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0]; |
| 1416 | X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1]; |
| 1417 | } |
| 1418 | } |
| 1419 | for (; k < sbr->kx[1] + sbr->m[1]; k++) { |
| 1420 | for (i = i_Temp; i < i_f; i++) { |
| 1421 | X[0][i][k] = Y1[i][k][0]; |
| 1422 | X[1][i][k] = Y1[i][k][1]; |
| 1423 | } |
| 1424 | } |
| 1425 | return 0; |
| 1426 | } |
| 1427 | |
| 1428 | /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping |
| 1429 | * (14496-3 sp04 p217) |
| 1430 | */ |
| 1431 | static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr, |
| 1432 | SBRData *ch_data, int e_a[2]) |
| 1433 | { |
| 1434 | int e, i, m; |
| 1435 | |
| 1436 | memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1])); |
| 1437 | for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1438 | const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]]; |
| 1439 | uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow; |
| 1440 | int k; |
| 1441 | |
| 1442 | if (sbr->kx[1] != table[0]) { |
| 1443 | av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. " |
| 1444 | "Derived frequency tables were not regenerated.\n"); |
| 1445 | sbr_turnoff(sbr); |
| 1446 | return AVERROR_BUG; |
| 1447 | } |
| 1448 | for (i = 0; i < ilim; i++) |
| 1449 | for (m = table[i]; m < table[i + 1]; m++) |
| 1450 | sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i]; |
| 1451 | |
| 1452 | // ch_data->bs_num_noise > 1 => 2 noise floors |
| 1453 | k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]); |
| 1454 | for (i = 0; i < sbr->n_q; i++) |
| 1455 | for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++) |
| 1456 | sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i]; |
| 1457 | |
| 1458 | for (i = 0; i < sbr->n[1]; i++) { |
| 1459 | if (ch_data->bs_add_harmonic_flag) { |
| 1460 | const unsigned int m_midpoint = |
| 1461 | (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1; |
| 1462 | |
| 1463 | ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] * |
| 1464 | (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1)); |
| 1465 | } |
| 1466 | } |
| 1467 | |
| 1468 | for (i = 0; i < ilim; i++) { |
| 1469 | int additional_sinusoid_present = 0; |
| 1470 | for (m = table[i]; m < table[i + 1]; m++) { |
| 1471 | if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) { |
| 1472 | additional_sinusoid_present = 1; |
| 1473 | break; |
| 1474 | } |
| 1475 | } |
| 1476 | memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present, |
| 1477 | (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0])); |
| 1478 | } |
| 1479 | } |
| 1480 | |
| 1481 | memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0])); |
| 1482 | return 0; |
| 1483 | } |
| 1484 | |
| 1485 | /// Estimation of current envelope (14496-3 sp04 p218) |
| 1486 | static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2], |
| 1487 | SpectralBandReplication *sbr, SBRData *ch_data) |
| 1488 | { |
| 1489 | int e, m; |
| 1490 | int kx1 = sbr->kx[1]; |
| 1491 | |
| 1492 | if (sbr->bs_interpol_freq) { |
| 1493 | for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1494 | const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]); |
| 1495 | int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1496 | int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1497 | |
| 1498 | for (m = 0; m < sbr->m[1]; m++) { |
| 1499 | float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb); |
| 1500 | e_curr[e][m] = sum * recip_env_size; |
| 1501 | } |
| 1502 | } |
| 1503 | } else { |
| 1504 | int k, p; |
| 1505 | |
| 1506 | for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1507 | const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]); |
| 1508 | int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1509 | int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1510 | const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow; |
| 1511 | |
| 1512 | for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) { |
| 1513 | float sum = 0.0f; |
| 1514 | const int den = env_size * (table[p + 1] - table[p]); |
| 1515 | |
| 1516 | for (k = table[p]; k < table[p + 1]; k++) { |
| 1517 | sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb); |
| 1518 | } |
| 1519 | sum /= den; |
| 1520 | for (k = table[p]; k < table[p + 1]; k++) { |
| 1521 | e_curr[e][k - kx1] = sum; |
| 1522 | } |
| 1523 | } |
| 1524 | } |
| 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | /** |
| 1529 | * Calculation of levels of additional HF signal components (14496-3 sp04 p219) |
| 1530 | * and Calculation of gain (14496-3 sp04 p219) |
| 1531 | */ |
| 1532 | static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr, |
| 1533 | SBRData *ch_data, const int e_a[2]) |
| 1534 | { |
| 1535 | int e, k, m; |
| 1536 | // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off) |
| 1537 | static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 }; |
| 1538 | |
| 1539 | for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1540 | int delta = !((e == e_a[1]) || (e == e_a[0])); |
| 1541 | for (k = 0; k < sbr->n_lim; k++) { |
| 1542 | float gain_boost, gain_max; |
| 1543 | float sum[2] = { 0.0f, 0.0f }; |
| 1544 | for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1545 | const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]); |
| 1546 | sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]); |
| 1547 | sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]); |
| 1548 | if (!sbr->s_mapped[e][m]) { |
| 1549 | sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] / |
| 1550 | ((1.0f + sbr->e_curr[e][m]) * |
| 1551 | (1.0f + sbr->q_mapped[e][m] * delta))); |
| 1552 | } else { |
| 1553 | sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] / |
| 1554 | ((1.0f + sbr->e_curr[e][m]) * |
| 1555 | (1.0f + sbr->q_mapped[e][m]))); |
| 1556 | } |
| 1557 | } |
| 1558 | for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1559 | sum[0] += sbr->e_origmapped[e][m]; |
| 1560 | sum[1] += sbr->e_curr[e][m]; |
| 1561 | } |
| 1562 | gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1])); |
| 1563 | gain_max = FFMIN(100000.f, gain_max); |
| 1564 | for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1565 | float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m]; |
| 1566 | sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max); |
| 1567 | sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max); |
| 1568 | } |
| 1569 | sum[0] = sum[1] = 0.0f; |
| 1570 | for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1571 | sum[0] += sbr->e_origmapped[e][m]; |
| 1572 | sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m] |
| 1573 | + sbr->s_m[e][m] * sbr->s_m[e][m] |
| 1574 | + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m]; |
| 1575 | } |
| 1576 | gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1])); |
| 1577 | gain_boost = FFMIN(1.584893192f, gain_boost); |
| 1578 | for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1579 | sbr->gain[e][m] *= gain_boost; |
| 1580 | sbr->q_m[e][m] *= gain_boost; |
| 1581 | sbr->s_m[e][m] *= gain_boost; |
| 1582 | } |
| 1583 | } |
| 1584 | } |
| 1585 | } |
| 1586 | |
| 1587 | /// Assembling HF Signals (14496-3 sp04 p220) |
| 1588 | static void sbr_hf_assemble(float Y1[38][64][2], |
| 1589 | const float X_high[64][40][2], |
| 1590 | SpectralBandReplication *sbr, SBRData *ch_data, |
| 1591 | const int e_a[2]) |
| 1592 | { |
| 1593 | int e, i, j, m; |
| 1594 | const int h_SL = 4 * !sbr->bs_smoothing_mode; |
| 1595 | const int kx = sbr->kx[1]; |
| 1596 | const int m_max = sbr->m[1]; |
| 1597 | static const float h_smooth[5] = { |
| 1598 | 0.33333333333333, |
| 1599 | 0.30150283239582, |
| 1600 | 0.21816949906249, |
| 1601 | 0.11516383427084, |
| 1602 | 0.03183050093751, |
| 1603 | }; |
| 1604 | float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp; |
| 1605 | int indexnoise = ch_data->f_indexnoise; |
| 1606 | int indexsine = ch_data->f_indexsine; |
| 1607 | |
| 1608 | if (sbr->reset) { |
| 1609 | for (i = 0; i < h_SL; i++) { |
| 1610 | memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0])); |
| 1611 | memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0])); |
| 1612 | } |
| 1613 | } else if (h_SL) { |
| 1614 | memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0])); |
| 1615 | memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0])); |
| 1616 | } |
| 1617 | |
| 1618 | for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1619 | for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) { |
| 1620 | memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0])); |
| 1621 | memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0])); |
| 1622 | } |
| 1623 | } |
| 1624 | |
| 1625 | for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1626 | for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) { |
| 1627 | LOCAL_ALIGNED_16(float, g_filt_tab, [48]); |
| 1628 | LOCAL_ALIGNED_16(float, q_filt_tab, [48]); |
| 1629 | float *g_filt, *q_filt; |
| 1630 | |
| 1631 | if (h_SL && e != e_a[0] && e != e_a[1]) { |
| 1632 | g_filt = g_filt_tab; |
| 1633 | q_filt = q_filt_tab; |
| 1634 | for (m = 0; m < m_max; m++) { |
| 1635 | const int idx1 = i + h_SL; |
| 1636 | g_filt[m] = 0.0f; |
| 1637 | q_filt[m] = 0.0f; |
| 1638 | for (j = 0; j <= h_SL; j++) { |
| 1639 | g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j]; |
| 1640 | q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j]; |
| 1641 | } |
| 1642 | } |
| 1643 | } else { |
| 1644 | g_filt = g_temp[i + h_SL]; |
| 1645 | q_filt = q_temp[i]; |
| 1646 | } |
| 1647 | |
| 1648 | sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max, |
| 1649 | i + ENVELOPE_ADJUSTMENT_OFFSET); |
| 1650 | |
| 1651 | if (e != e_a[0] && e != e_a[1]) { |
| 1652 | sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e], |
| 1653 | q_filt, indexnoise, |
| 1654 | kx, m_max); |
| 1655 | } else { |
| 1656 | int idx = indexsine&1; |
| 1657 | int A = (1-((indexsine+(kx & 1))&2)); |
| 1658 | int B = (A^(-idx)) + idx; |
| 1659 | float *out = &Y1[i][kx][idx]; |
| 1660 | float *in = sbr->s_m[e]; |
| 1661 | for (m = 0; m+1 < m_max; m+=2) { |
| 1662 | out[2*m ] += in[m ] * A; |
| 1663 | out[2*m+2] += in[m+1] * B; |
| 1664 | } |
| 1665 | if(m_max&1) |
| 1666 | out[2*m ] += in[m ] * A; |
| 1667 | } |
| 1668 | indexnoise = (indexnoise + m_max) & 0x1ff; |
| 1669 | indexsine = (indexsine + 1) & 3; |
| 1670 | } |
| 1671 | } |
| 1672 | ch_data->f_indexnoise = indexnoise; |
| 1673 | ch_data->f_indexsine = indexsine; |
| 1674 | } |
| 1675 | |
| 1676 | void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac, |
| 1677 | float* L, float* R) |
| 1678 | { |
| 1679 | int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate; |
| 1680 | int ch; |
| 1681 | int nch = (id_aac == TYPE_CPE) ? 2 : 1; |
| 1682 | int err; |
| 1683 | |
| 1684 | if (!sbr->kx_and_m_pushed) { |
| 1685 | sbr->kx[0] = sbr->kx[1]; |
| 1686 | sbr->m[0] = sbr->m[1]; |
| 1687 | } else { |
| 1688 | sbr->kx_and_m_pushed = 0; |
| 1689 | } |
| 1690 | |
| 1691 | if (sbr->start) { |
| 1692 | sbr_dequant(sbr, id_aac); |
| 1693 | } |
| 1694 | for (ch = 0; ch < nch; ch++) { |
| 1695 | /* decode channel */ |
| 1696 | sbr_qmf_analysis(&ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples, |
| 1697 | (float*)sbr->qmf_filter_scratch, |
| 1698 | sbr->data[ch].W, sbr->data[ch].Ypos); |
| 1699 | sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low, |
| 1700 | (const float (*)[32][32][2]) sbr->data[ch].W, |
| 1701 | sbr->data[ch].Ypos); |
| 1702 | sbr->data[ch].Ypos ^= 1; |
| 1703 | if (sbr->start) { |
| 1704 | sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, |
| 1705 | (const float (*)[40][2]) sbr->X_low, sbr->k[0]); |
| 1706 | sbr_chirp(sbr, &sbr->data[ch]); |
| 1707 | sbr_hf_gen(ac, sbr, sbr->X_high, |
| 1708 | (const float (*)[40][2]) sbr->X_low, |
| 1709 | (const float (*)[2]) sbr->alpha0, |
| 1710 | (const float (*)[2]) sbr->alpha1, |
| 1711 | sbr->data[ch].bw_array, sbr->data[ch].t_env, |
| 1712 | sbr->data[ch].bs_num_env); |
| 1713 | |
| 1714 | // hf_adj |
| 1715 | err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); |
| 1716 | if (!err) { |
| 1717 | sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]); |
| 1718 | sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); |
| 1719 | sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos], |
| 1720 | (const float (*)[40][2]) sbr->X_high, |
| 1721 | sbr, &sbr->data[ch], |
| 1722 | sbr->data[ch].e_a); |
| 1723 | } |
| 1724 | } |
| 1725 | |
| 1726 | /* synthesis */ |
| 1727 | sbr->c.sbr_x_gen(sbr, sbr->X[ch], |
| 1728 | (const float (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos], |
| 1729 | (const float (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos], |
| 1730 | (const float (*)[40][2]) sbr->X_low, ch); |
| 1731 | } |
| 1732 | |
| 1733 | if (ac->oc[1].m4ac.ps == 1) { |
| 1734 | if (sbr->ps.start) { |
| 1735 | ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]); |
| 1736 | } else { |
| 1737 | memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0])); |
| 1738 | } |
| 1739 | nch = 2; |
| 1740 | } |
| 1741 | |
| 1742 | sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp, |
| 1743 | L, sbr->X[0], sbr->qmf_filter_scratch, |
| 1744 | sbr->data[0].synthesis_filterbank_samples, |
| 1745 | &sbr->data[0].synthesis_filterbank_samples_offset, |
| 1746 | downsampled); |
| 1747 | if (nch == 2) |
| 1748 | sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp, |
| 1749 | R, sbr->X[1], sbr->qmf_filter_scratch, |
| 1750 | sbr->data[1].synthesis_filterbank_samples, |
| 1751 | &sbr->data[1].synthesis_filterbank_samples_offset, |
| 1752 | downsampled); |
| 1753 | } |
| 1754 | |
| 1755 | static void aacsbr_func_ptr_init(AACSBRContext *c) |
| 1756 | { |
| 1757 | c->sbr_lf_gen = sbr_lf_gen; |
| 1758 | c->sbr_hf_assemble = sbr_hf_assemble; |
| 1759 | c->sbr_x_gen = sbr_x_gen; |
| 1760 | c->sbr_hf_inverse_filter = sbr_hf_inverse_filter; |
| 1761 | |
| 1762 | if(ARCH_MIPS) |
| 1763 | ff_aacsbr_func_ptr_init_mips(c); |
| 1764 | } |