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fe41b5411267ec2851223894181d834f9d710266
[libav.git] / libavcodec / aacsbr.c
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 libavcodec/aacsbr.c
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 "fft.h"
34
35 #include <stdint.h>
36 #include <float.h>
37
38 #define ENVELOPE_ADJUSTMENT_OFFSET 2
39 #define NOISE_FLOOR_OFFSET 6.0f
40
41 /**
42 * SBR VLC tables
43 */
44 enum {
45 T_HUFFMAN_ENV_1_5DB,
46 F_HUFFMAN_ENV_1_5DB,
47 T_HUFFMAN_ENV_BAL_1_5DB,
48 F_HUFFMAN_ENV_BAL_1_5DB,
49 T_HUFFMAN_ENV_3_0DB,
50 F_HUFFMAN_ENV_3_0DB,
51 T_HUFFMAN_ENV_BAL_3_0DB,
52 F_HUFFMAN_ENV_BAL_3_0DB,
53 T_HUFFMAN_NOISE_3_0DB,
54 T_HUFFMAN_NOISE_BAL_3_0DB,
55 };
56
57 /**
58 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
59 */
60 enum {
61 FIXFIX,
62 FIXVAR,
63 VARFIX,
64 VARVAR,
65 };
66
67 enum {
68 EXTENSION_ID_PS = 2,
69 };
70
71 static VLC vlc_sbr[10];
72 static const int8_t vlc_sbr_lav[10] =
73 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
74 static DECLARE_ALIGNED(16, float, analysis_cos_pre)[64];
75 static DECLARE_ALIGNED(16, float, analysis_sin_pre)[64];
76 static DECLARE_ALIGNED(16, float, analysis_cossin_post)[32][2];
77 static const DECLARE_ALIGNED(16, float, zero64)[64];
78
79 #define SBR_INIT_VLC_STATIC(num, size) \
80 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
81 sbr_tmp[num].sbr_bits , 1, 1, \
82 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
83 size)
84
85 #define SBR_VLC_ROW(name) \
86 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
87
88 av_cold void ff_aac_sbr_init(void)
89 {
90 int n, k;
91 static const struct {
92 const void *sbr_codes, *sbr_bits;
93 const unsigned int table_size, elem_size;
94 } sbr_tmp[] = {
95 SBR_VLC_ROW(t_huffman_env_1_5dB),
96 SBR_VLC_ROW(f_huffman_env_1_5dB),
97 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
98 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
99 SBR_VLC_ROW(t_huffman_env_3_0dB),
100 SBR_VLC_ROW(f_huffman_env_3_0dB),
101 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
102 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
103 SBR_VLC_ROW(t_huffman_noise_3_0dB),
104 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
105 };
106
107 // SBR VLC table initialization
108 SBR_INIT_VLC_STATIC(0, 1098);
109 SBR_INIT_VLC_STATIC(1, 1092);
110 SBR_INIT_VLC_STATIC(2, 768);
111 SBR_INIT_VLC_STATIC(3, 1026);
112 SBR_INIT_VLC_STATIC(4, 1058);
113 SBR_INIT_VLC_STATIC(5, 1052);
114 SBR_INIT_VLC_STATIC(6, 544);
115 SBR_INIT_VLC_STATIC(7, 544);
116 SBR_INIT_VLC_STATIC(8, 592);
117 SBR_INIT_VLC_STATIC(9, 512);
118
119 for (n = 0; n < 64; n++) {
120 float pre = M_PI * n / 64;
121 analysis_cos_pre[n] = cosf(pre);
122 analysis_sin_pre[n] = sinf(pre);
123 }
124 for (k = 0; k < 32; k++) {
125 float post = M_PI * (k + 0.5) / 128;
126 analysis_cossin_post[k][0] = 4.0 * cosf(post);
127 analysis_cossin_post[k][1] = -4.0 * sinf(post);
128 }
129 for (n = 1; n < 320; n++)
130 sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
131 sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
132 sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
133
134 for (n = 0; n < 320; n++)
135 sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
136 }
137
138 av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr)
139 {
140 sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
141 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
142 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
143 ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64);
144 ff_rdft_init(&sbr->rdft, 6, IDFT_R2C);
145 }
146
147 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
148 {
149 ff_mdct_end(&sbr->mdct);
150 ff_rdft_end(&sbr->rdft);
151 }
152
153 static int qsort_comparison_function_int16(const void *a, const void *b)
154 {
155 return *(const int16_t *)a - *(const int16_t *)b;
156 }
157
158 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
159 {
160 int i;
161 for (i = 0; i <= last_el; i++)
162 if (table[i] == needle)
163 return 1;
164 return 0;
165 }
166
167 /// Limiter Frequency Band Table (14496-3 sp04 p198)
168 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
169 {
170 int k;
171 if (sbr->bs_limiter_bands > 0) {
172 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
173 1.18509277094158210129f, //2^(0.49/2)
174 1.11987160404675912501f }; //2^(0.49/3)
175 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
176 int16_t patch_borders[5];
177 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
178
179 patch_borders[0] = sbr->kx[1];
180 for (k = 1; k <= sbr->num_patches; k++)
181 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
182
183 memcpy(sbr->f_tablelim, sbr->f_tablelow,
184 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
185 if (sbr->num_patches > 1)
186 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
187 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
188
189 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
190 sizeof(sbr->f_tablelim[0]),
191 qsort_comparison_function_int16);
192
193 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
194 while (out < sbr->f_tablelim + sbr->n_lim) {
195 if (*in >= *out * lim_bands_per_octave_warped) {
196 *++out = *in++;
197 } else if (*in == *out ||
198 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
199 in++;
200 sbr->n_lim--;
201 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
202 *out = *in++;
203 sbr->n_lim--;
204 } else {
205 *++out = *in++;
206 }
207 }
208 } else {
209 sbr->f_tablelim[0] = sbr->f_tablelow[0];
210 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
211 sbr->n_lim = 1;
212 }
213 }
214
215 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
216 {
217 unsigned int cnt = get_bits_count(gb);
218 uint8_t bs_header_extra_1;
219 uint8_t bs_header_extra_2;
220 int old_bs_limiter_bands = sbr->bs_limiter_bands;
221 SpectrumParameters old_spectrum_params;
222
223 sbr->start = 1;
224
225 // Save last spectrum parameters variables to compare to new ones
226 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
227
228 sbr->bs_amp_res_header = get_bits1(gb);
229 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
230 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
231 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
232 skip_bits(gb, 2); // bs_reserved
233
234 bs_header_extra_1 = get_bits1(gb);
235 bs_header_extra_2 = get_bits1(gb);
236
237 if (bs_header_extra_1) {
238 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
239 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
240 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
241 } else {
242 sbr->spectrum_params.bs_freq_scale = 2;
243 sbr->spectrum_params.bs_alter_scale = 1;
244 sbr->spectrum_params.bs_noise_bands = 2;
245 }
246
247 // Check if spectrum parameters changed
248 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
249 sbr->reset = 1;
250
251 if (bs_header_extra_2) {
252 sbr->bs_limiter_bands = get_bits(gb, 2);
253 sbr->bs_limiter_gains = get_bits(gb, 2);
254 sbr->bs_interpol_freq = get_bits1(gb);
255 sbr->bs_smoothing_mode = get_bits1(gb);
256 } else {
257 sbr->bs_limiter_bands = 2;
258 sbr->bs_limiter_gains = 2;
259 sbr->bs_interpol_freq = 1;
260 sbr->bs_smoothing_mode = 1;
261 }
262
263 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
264 sbr_make_f_tablelim(sbr);
265
266 return get_bits_count(gb) - cnt;
267 }
268
269 static int array_min_int16(const int16_t *array, int nel)
270 {
271 int i, min = array[0];
272 for (i = 1; i < nel; i++)
273 min = FFMIN(array[i], min);
274 return min;
275 }
276
277 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
278 {
279 int k, previous, present;
280 float base, prod;
281
282 base = powf((float)stop / start, 1.0f / num_bands);
283 prod = start;
284 previous = start;
285
286 for (k = 0; k < num_bands-1; k++) {
287 prod *= base;
288 present = lrintf(prod);
289 bands[k] = present - previous;
290 previous = present;
291 }
292 bands[num_bands-1] = stop - previous;
293 }
294
295 static int check_n_master(AVCodecContext *avccontext, int n_master, int bs_xover_band)
296 {
297 // Requirements (14496-3 sp04 p205)
298 if (n_master <= 0) {
299 av_log(avccontext, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
300 return -1;
301 }
302 if (bs_xover_band >= n_master) {
303 av_log(avccontext, AV_LOG_ERROR,
304 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
305 bs_xover_band);
306 return -1;
307 }
308 return 0;
309 }
310
311 /// Master Frequency Band Table (14496-3 sp04 p194)
312 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
313 SpectrumParameters *spectrum)
314 {
315 unsigned int temp, max_qmf_subbands;
316 unsigned int start_min, stop_min;
317 int k;
318 const int8_t *sbr_offset_ptr;
319 int16_t stop_dk[13];
320
321 if (sbr->sample_rate < 32000) {
322 temp = 3000;
323 } else if (sbr->sample_rate < 64000) {
324 temp = 4000;
325 } else
326 temp = 5000;
327
328 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
329 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
330
331 switch (sbr->sample_rate) {
332 case 16000:
333 sbr_offset_ptr = sbr_offset[0];
334 break;
335 case 22050:
336 sbr_offset_ptr = sbr_offset[1];
337 break;
338 case 24000:
339 sbr_offset_ptr = sbr_offset[2];
340 break;
341 case 32000:
342 sbr_offset_ptr = sbr_offset[3];
343 break;
344 case 44100: case 48000: case 64000:
345 sbr_offset_ptr = sbr_offset[4];
346 break;
347 case 88200: case 96000: case 128000: case 176400: case 192000:
348 sbr_offset_ptr = sbr_offset[5];
349 break;
350 default:
351 av_log(ac->avccontext, AV_LOG_ERROR,
352 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
353 return -1;
354 }
355
356 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
357
358 if (spectrum->bs_stop_freq < 14) {
359 sbr->k[2] = stop_min;
360 make_bands(stop_dk, stop_min, 64, 13);
361 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
362 for (k = 0; k < spectrum->bs_stop_freq; k++)
363 sbr->k[2] += stop_dk[k];
364 } else if (spectrum->bs_stop_freq == 14) {
365 sbr->k[2] = 2*sbr->k[0];
366 } else if (spectrum->bs_stop_freq == 15) {
367 sbr->k[2] = 3*sbr->k[0];
368 } else {
369 av_log(ac->avccontext, AV_LOG_ERROR,
370 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
371 return -1;
372 }
373 sbr->k[2] = FFMIN(64, sbr->k[2]);
374
375 // Requirements (14496-3 sp04 p205)
376 if (sbr->sample_rate <= 32000) {
377 max_qmf_subbands = 48;
378 } else if (sbr->sample_rate == 44100) {
379 max_qmf_subbands = 35;
380 } else if (sbr->sample_rate >= 48000)
381 max_qmf_subbands = 32;
382
383 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
384 av_log(ac->avccontext, AV_LOG_ERROR,
385 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
386 return -1;
387 }
388
389 if (!spectrum->bs_freq_scale) {
390 unsigned int dk;
391 int k2diff;
392
393 dk = spectrum->bs_alter_scale + 1;
394 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
395 if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
396 return -1;
397
398 for (k = 1; k <= sbr->n_master; k++)
399 sbr->f_master[k] = dk;
400
401 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
402 if (k2diff < 0) {
403 sbr->f_master[1]--;
404 sbr->f_master[2]-= (k2diff < 1);
405 } else if (k2diff) {
406 sbr->f_master[sbr->n_master]++;
407 }
408
409 sbr->f_master[0] = sbr->k[0];
410 for (k = 1; k <= sbr->n_master; k++)
411 sbr->f_master[k] += sbr->f_master[k - 1];
412
413 } else {
414 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
415 int two_regions, num_bands_0;
416 int vdk0_max, vdk1_min;
417 int16_t vk0[49];
418
419 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
420 two_regions = 1;
421 sbr->k[1] = 2 * sbr->k[0];
422 } else {
423 two_regions = 0;
424 sbr->k[1] = sbr->k[2];
425 }
426
427 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
428
429 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
430 av_log(ac->avccontext, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
431 return -1;
432 }
433
434 vk0[0] = 0;
435
436 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
437
438 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
439 vdk0_max = vk0[num_bands_0];
440
441 vk0[0] = sbr->k[0];
442 for (k = 1; k <= num_bands_0; k++) {
443 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
444 av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
445 return -1;
446 }
447 vk0[k] += vk0[k-1];
448 }
449
450 if (two_regions) {
451 int16_t vk1[49];
452 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
453 : 1.0f; // bs_alter_scale = {0,1}
454 int num_bands_1 = lrintf(half_bands * invwarp *
455 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
456
457 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
458
459 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
460
461 if (vdk1_min < vdk0_max) {
462 int change;
463 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
464 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
465 vk1[1] += change;
466 vk1[num_bands_1] -= change;
467 }
468
469 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
470
471 vk1[0] = sbr->k[1];
472 for (k = 1; k <= num_bands_1; k++) {
473 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
474 av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
475 return -1;
476 }
477 vk1[k] += vk1[k-1];
478 }
479
480 sbr->n_master = num_bands_0 + num_bands_1;
481 if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
482 return -1;
483 memcpy(&sbr->f_master[0], vk0,
484 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
485 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
486 num_bands_1 * sizeof(sbr->f_master[0]));
487
488 } else {
489 sbr->n_master = num_bands_0;
490 if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
491 return -1;
492 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
493 }
494 }
495
496 return 0;
497 }
498
499 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
500 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
501 {
502 int i, k, sb = 0;
503 int msb = sbr->k[0];
504 int usb = sbr->kx[1];
505 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
506
507 sbr->num_patches = 0;
508
509 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
510 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
511 } else
512 k = sbr->n_master;
513
514 do {
515 int odd = 0;
516 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
517 sb = sbr->f_master[i];
518 odd = (sb + sbr->k[0]) & 1;
519 }
520
521 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
522 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
523
524 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
525 usb = sb;
526 msb = sb;
527 sbr->num_patches++;
528 } else
529 msb = sbr->kx[1];
530
531 if (sbr->f_master[k] - sb < 3)
532 k = sbr->n_master;
533 } while (sb != sbr->kx[1] + sbr->m[1]);
534
535 if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
536 sbr->num_patches--;
537
538 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5
539 // However the Coding Technologies decoder check uses 6 patches
540 if (sbr->num_patches > 6) {
541 av_log(ac->avccontext, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
542 return -1;
543 }
544
545 return 0;
546 }
547
548 /// Derived Frequency Band Tables (14496-3 sp04 p197)
549 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
550 {
551 int k, temp;
552
553 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
554 sbr->n[0] = (sbr->n[1] + 1) >> 1;
555
556 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
557 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
558 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
559 sbr->kx[1] = sbr->f_tablehigh[0];
560
561 // Requirements (14496-3 sp04 p205)
562 if (sbr->kx[1] + sbr->m[1] > 64) {
563 av_log(ac->avccontext, AV_LOG_ERROR,
564 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
565 return -1;
566 }
567 if (sbr->kx[1] > 32) {
568 av_log(ac->avccontext, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
569 return -1;
570 }
571
572 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
573 temp = sbr->n[1] & 1;
574 for (k = 1; k <= sbr->n[0]; k++)
575 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
576
577 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
578 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
579 if (sbr->n_q > 5) {
580 av_log(ac->avccontext, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
581 return -1;
582 }
583
584 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
585 temp = 0;
586 for (k = 1; k <= sbr->n_q; k++) {
587 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
588 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
589 }
590
591 if (sbr_hf_calc_npatches(ac, sbr) < 0)
592 return -1;
593
594 sbr_make_f_tablelim(sbr);
595
596 sbr->data[0].f_indexnoise = 0;
597 sbr->data[1].f_indexnoise = 0;
598
599 return 0;
600 }
601
602 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
603 int elements)
604 {
605 int i;
606 for (i = 0; i < elements; i++) {
607 vec[i] = get_bits1(gb);
608 }
609 }
610
611 /** ceil(log2(index+1)) */
612 static const int8_t ceil_log2[] = {
613 0, 1, 2, 2, 3, 3,
614 };
615
616 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
617 GetBitContext *gb, SBRData *ch_data)
618 {
619 int i;
620
621 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env[1]];
622 ch_data->bs_num_env[0] = ch_data->bs_num_env[1];
623 ch_data->bs_amp_res = sbr->bs_amp_res_header;
624
625 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
626 case FIXFIX:
627 ch_data->bs_num_env[1] = 1 << get_bits(gb, 2);
628 if (ch_data->bs_num_env[1] == 1)
629 ch_data->bs_amp_res = 0;
630
631 ch_data->bs_freq_res[1] = get_bits1(gb);
632 for (i = 1; i < ch_data->bs_num_env[1]; i++)
633 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
634 break;
635 case FIXVAR:
636 ch_data->bs_var_bord[1] = get_bits(gb, 2);
637 ch_data->bs_num_rel[1] = get_bits(gb, 2);
638 ch_data->bs_num_env[1] = ch_data->bs_num_rel[1] + 1;
639
640 for (i = 0; i < ch_data->bs_num_rel[1]; i++)
641 ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
642
643 ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
644
645 for (i = 0; i < ch_data->bs_num_env[1]; i++)
646 ch_data->bs_freq_res[ch_data->bs_num_env[1] - i] = get_bits1(gb);
647 break;
648 case VARFIX:
649 ch_data->bs_var_bord[0] = get_bits(gb, 2);
650 ch_data->bs_num_rel[0] = get_bits(gb, 2);
651 ch_data->bs_num_env[1] = ch_data->bs_num_rel[0] + 1;
652
653 for (i = 0; i < ch_data->bs_num_rel[0]; i++)
654 ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
655
656 ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
657
658 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
659 break;
660 case VARVAR:
661 ch_data->bs_var_bord[0] = get_bits(gb, 2);
662 ch_data->bs_var_bord[1] = get_bits(gb, 2);
663 ch_data->bs_num_rel[0] = get_bits(gb, 2);
664 ch_data->bs_num_rel[1] = get_bits(gb, 2);
665 ch_data->bs_num_env[1] = ch_data->bs_num_rel[0] + ch_data->bs_num_rel[1] + 1;
666
667 for (i = 0; i < ch_data->bs_num_rel[0]; i++)
668 ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
669 for (i = 0; i < ch_data->bs_num_rel[1]; i++)
670 ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
671
672 ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
673
674 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
675 break;
676 }
677
678 if (ch_data->bs_frame_class == FIXFIX && ch_data->bs_num_env[1] > 4) {
679 av_log(ac->avccontext, AV_LOG_ERROR,
680 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
681 ch_data->bs_num_env[1]);
682 return -1;
683 }
684 if (ch_data->bs_frame_class == VARVAR && ch_data->bs_num_env[1] > 5) {
685 av_log(ac->avccontext, AV_LOG_ERROR,
686 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
687 ch_data->bs_num_env[1]);
688 return -1;
689 }
690
691 ch_data->bs_num_noise = (ch_data->bs_num_env[1] > 1) + 1;
692
693 return 0;
694 }
695
696 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
697 //These variables are saved from the previous frame rather than copied
698 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env[1]];
699 dst->bs_num_env[0] = dst->bs_num_env[1];
700
701 //These variables are read from the bitstream and therefore copied
702 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
703 memcpy(dst->bs_num_env+1, src->bs_num_env+1, sizeof(dst->bs_num_env)- sizeof(*dst->bs_num_env));
704 memcpy(dst->bs_var_bord, src->bs_var_bord, sizeof(dst->bs_var_bord));
705 memcpy(dst->bs_rel_bord, src->bs_rel_bord, sizeof(dst->bs_rel_bord));
706 memcpy(dst->bs_num_rel, src->bs_num_rel, sizeof(dst->bs_rel_bord));
707 dst->bs_amp_res = src->bs_amp_res;
708 dst->bs_num_noise = src->bs_num_noise;
709 dst->bs_pointer = src->bs_pointer;
710 dst->bs_frame_class = src->bs_frame_class;
711 }
712
713 /// Read how the envelope and noise floor data is delta coded
714 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
715 SBRData *ch_data)
716 {
717 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env[1]);
718 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
719 }
720
721 /// Read inverse filtering data
722 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
723 SBRData *ch_data)
724 {
725 int i;
726
727 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
728 for (i = 0; i < sbr->n_q; i++)
729 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
730 }
731
732 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
733 SBRData *ch_data, int ch)
734 {
735 int bits;
736 int i, j, k;
737 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
738 int t_lav, f_lav;
739 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
740 const int odd = sbr->n[1] & 1;
741
742 if (sbr->bs_coupling && ch) {
743 if (ch_data->bs_amp_res) {
744 bits = 5;
745 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
746 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
747 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
748 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
749 } else {
750 bits = 6;
751 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
752 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
753 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
754 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
755 }
756 } else {
757 if (ch_data->bs_amp_res) {
758 bits = 6;
759 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
760 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
761 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
762 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
763 } else {
764 bits = 7;
765 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
766 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
767 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
768 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
769 }
770 }
771
772 for (i = 0; i < ch_data->bs_num_env[1]; i++) {
773 if (ch_data->bs_df_env[i]) {
774 // bs_freq_res[0] == bs_freq_res[bs_num_env[1]] from prev frame
775 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
776 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
777 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
778 } else if (ch_data->bs_freq_res[i + 1]) {
779 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
780 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
781 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
782 }
783 } else {
784 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
785 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
786 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
787 }
788 }
789 } else {
790 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
791 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
792 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);
793 }
794 }
795
796 //assign 0th elements of env_facs from last elements
797 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env[1]],
798 sizeof(ch_data->env_facs[0]));
799 }
800
801 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
802 SBRData *ch_data, int ch)
803 {
804 int i, j;
805 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
806 int t_lav, f_lav;
807 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
808
809 if (sbr->bs_coupling && ch) {
810 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
811 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
812 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
813 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
814 } else {
815 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
816 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
817 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
818 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
819 }
820
821 for (i = 0; i < ch_data->bs_num_noise; i++) {
822 if (ch_data->bs_df_noise[i]) {
823 for (j = 0; j < sbr->n_q; j++)
824 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
825 } else {
826 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
827 for (j = 1; j < sbr->n_q; j++)
828 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);
829 }
830 }
831
832 //assign 0th elements of noise_facs from last elements
833 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
834 sizeof(ch_data->noise_facs[0]));
835 }
836
837 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
838 GetBitContext *gb,
839 int bs_extension_id, int *num_bits_left)
840 {
841 //TODO - implement ps_data for parametric stereo parsing
842 switch (bs_extension_id) {
843 case EXTENSION_ID_PS:
844 #if 0
845 *num_bits_left -= ff_ps_data(gb, ps);
846 #else
847 av_log_missing_feature(ac->avccontext, "Parametric Stereo is", 0);
848 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
849 *num_bits_left = 0;
850 #endif
851 break;
852 default:
853 av_log_missing_feature(ac->avccontext, "Reserved SBR extensions are", 1);
854 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
855 *num_bits_left = 0;
856 break;
857 }
858 }
859
860 static void read_sbr_single_channel_element(AACContext *ac,
861 SpectralBandReplication *sbr,
862 GetBitContext *gb)
863 {
864 if (get_bits1(gb)) // bs_data_extra
865 skip_bits(gb, 4); // bs_reserved
866
867 read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
868 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
869 read_sbr_invf(sbr, gb, &sbr->data[0]);
870 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
871 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
872
873 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
874 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
875 }
876
877 static void read_sbr_channel_pair_element(AACContext *ac,
878 SpectralBandReplication *sbr,
879 GetBitContext *gb)
880 {
881 if (get_bits1(gb)) // bs_data_extra
882 skip_bits(gb, 8); // bs_reserved
883
884 if ((sbr->bs_coupling = get_bits1(gb))) {
885 read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
886 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
887 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
888 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
889 read_sbr_invf(sbr, gb, &sbr->data[0]);
890 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
891 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
892 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
893 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
894 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
895 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
896 } else {
897 read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
898 read_sbr_grid(ac, sbr, gb, &sbr->data[1]);
899 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
900 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
901 read_sbr_invf(sbr, gb, &sbr->data[0]);
902 read_sbr_invf(sbr, gb, &sbr->data[1]);
903 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
904 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
905 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
906 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
907 }
908
909 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
910 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
911 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
912 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
913 }
914
915 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
916 GetBitContext *gb, int id_aac)
917 {
918 unsigned int cnt = get_bits_count(gb);
919
920 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
921 read_sbr_single_channel_element(ac, sbr, gb);
922 } else if (id_aac == TYPE_CPE) {
923 read_sbr_channel_pair_element(ac, sbr, gb);
924 } else {
925 av_log(ac->avccontext, AV_LOG_ERROR,
926 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
927 sbr->start = 0;
928 return get_bits_count(gb) - cnt;
929 }
930 if (get_bits1(gb)) { // bs_extended_data
931 int num_bits_left = get_bits(gb, 4); // bs_extension_size
932 if (num_bits_left == 15)
933 num_bits_left += get_bits(gb, 8); // bs_esc_count
934
935 num_bits_left <<= 3;
936 while (num_bits_left > 7) {
937 num_bits_left -= 2;
938 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
939 }
940 }
941
942 return get_bits_count(gb) - cnt;
943 }
944
945 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
946 {
947 int err;
948 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
949 if (err >= 0)
950 err = sbr_make_f_derived(ac, sbr);
951 if (err < 0) {
952 av_log(ac->avccontext, AV_LOG_ERROR,
953 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
954 sbr->start = 0;
955 }
956 }
957
958 /**
959 * Decode Spectral Band Replication extension data; reference: table 4.55.
960 *
961 * @param crc flag indicating the presence of CRC checksum
962 * @param cnt length of TYPE_FIL syntactic element in bytes
963 *
964 * @return Returns number of bytes consumed from the TYPE_FIL element.
965 */
966 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
967 GetBitContext *gb_host, int crc, int cnt, int id_aac)
968 {
969 unsigned int num_sbr_bits = 0, num_align_bits;
970 unsigned bytes_read;
971 GetBitContext gbc = *gb_host, *gb = &gbc;
972 skip_bits_long(gb_host, cnt*8 - 4);
973
974 sbr->reset = 0;
975
976 if (!sbr->sample_rate)
977 sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
978 if (!ac->m4ac.ext_sample_rate)
979 ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
980
981 if (crc) {
982 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
983 num_sbr_bits += 10;
984 }
985
986 //Save some state from the previous frame.
987 sbr->kx[0] = sbr->kx[1];
988 sbr->m[0] = sbr->m[1];
989
990 num_sbr_bits++;
991 if (get_bits1(gb)) // bs_header_flag
992 num_sbr_bits += read_sbr_header(sbr, gb);
993
994 if (sbr->reset)
995 sbr_reset(ac, sbr);
996
997 if (sbr->start)
998 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
999
1000 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1001 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1002
1003 if (bytes_read > cnt) {
1004 av_log(ac->avccontext, AV_LOG_ERROR,
1005 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1006 }
1007 return cnt;
1008 }
1009
1010 /// Time/frequency Grid (14496-3 sp04 p200)
1011 static int sbr_time_freq_grid(AACContext *ac, SpectralBandReplication *sbr,
1012 SBRData *ch_data, int ch)
1013 {
1014 int abs_bord_lead = ch_data->bs_frame_class >= 2 ? ch_data->bs_var_bord[0] : 0;
1015 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
1016 int abs_bord_trail = (ch_data->bs_frame_class & 1 ? ch_data->bs_var_bord[1] : 0) + 16;
1017 int n_rel_lead;
1018 int i;
1019
1020 if (ch_data->bs_frame_class == FIXFIX) {
1021 n_rel_lead = ch_data->bs_num_env[1] - 1;
1022 } else if (ch_data->bs_frame_class == FIXVAR) {
1023 n_rel_lead = 0;
1024 } else if (ch_data->bs_frame_class < 4) { // VARFIX or VARVAR
1025 n_rel_lead = ch_data->bs_num_rel[0];
1026 } else {
1027 av_log(ac->avccontext, AV_LOG_ERROR,
1028 "Invalid bs_frame_class for SBR: %d\n", ch_data->bs_frame_class);
1029 return -1;
1030 }
1031
1032 ch_data->t_env_num_env_old = ch_data->t_env[ch_data->bs_num_env[0]];
1033 ch_data->t_env[0] = abs_bord_lead;
1034 ch_data->t_env[ch_data->bs_num_env[1]] = abs_bord_trail;
1035
1036 if (ch_data->bs_frame_class == FIXFIX) {
1037 int temp = (abs_bord_trail + (ch_data->bs_num_env[1] >> 1)) /
1038 ch_data->bs_num_env[1];
1039 for (i = 0; i < n_rel_lead; i++)
1040 ch_data->t_env[i + 1] = ch_data->t_env[i] + temp;
1041 } else if (ch_data->bs_frame_class > 1) { // VARFIX or VARVAR
1042 for (i = 0; i < n_rel_lead; i++)
1043 ch_data->t_env[i + 1] = ch_data->t_env[i] + ch_data->bs_rel_bord[0][i];
1044 } else { // FIXVAR
1045 for (i = 0; i < n_rel_lead; i++)
1046 ch_data->t_env[i + 1] = abs_bord_lead;
1047 }
1048
1049 if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
1050 for (i = ch_data->bs_num_env[1] - 1; i > n_rel_lead; i--)
1051 ch_data->t_env[i] = ch_data->t_env[i + 1] -
1052 ch_data->bs_rel_bord[1][ch_data->bs_num_env[1] - 1 - i];
1053 } else { // FIXFIX or VARFIX
1054 for (i = n_rel_lead; i < ch_data->bs_num_env[1]; i++)
1055 ch_data->t_env[i + 1] = abs_bord_trail;
1056 }
1057
1058 ch_data->t_q[0] = ch_data->t_env[0];
1059 if (ch_data->bs_num_noise > 1) { // typo in spec bases this on bs_num_env...
1060 unsigned int idx;
1061 if (ch_data->bs_frame_class == FIXFIX) {
1062 idx = ch_data->bs_num_env[1] >> 1;
1063 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
1064 idx = ch_data->bs_num_env[1] - FFMAX(ch_data->bs_pointer - 1, 1);
1065 } else { // VARFIX
1066 if (!ch_data->bs_pointer)
1067 idx = 1;
1068 else if (ch_data->bs_pointer == 1)
1069 idx = ch_data->bs_num_env[1] - 1;
1070 else // bs_pointer > 1
1071 idx = ch_data->bs_pointer - 1;
1072 }
1073 ch_data->t_q[1] = ch_data->t_env[idx];
1074 ch_data->t_q[2] = ch_data->t_env[ch_data->bs_num_env[1]];
1075 } else
1076 ch_data->t_q[1] = ch_data->t_env[ch_data->bs_num_env[1]];
1077
1078 return 0;
1079 }
1080
1081 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1082 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1083 {
1084 int k, e;
1085 int ch;
1086
1087 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1088 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1089 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1090 for (e = 1; e <= sbr->data[0].bs_num_env[1]; e++) {
1091 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1092 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1093 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1094 float fac = temp1 / (1.0f + temp2);
1095 sbr->data[0].env_facs[e][k] = fac;
1096 sbr->data[1].env_facs[e][k] = fac * temp2;
1097 }
1098 }
1099 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1100 for (k = 0; k < sbr->n_q; k++) {
1101 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1102 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1103 float fac = temp1 / (1.0f + temp2);
1104 sbr->data[0].noise_facs[e][k] = fac;
1105 sbr->data[1].noise_facs[e][k] = fac * temp2;
1106 }
1107 }
1108 } else { // SCE or one non-coupled CPE
1109 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1110 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1111 for (e = 1; e <= sbr->data[ch].bs_num_env[1]; e++)
1112 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1113 sbr->data[ch].env_facs[e][k] =
1114 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1115 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1116 for (k = 0; k < sbr->n_q; k++)
1117 sbr->data[ch].noise_facs[e][k] =
1118 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1119 }
1120 }
1121 }
1122
1123 /**
1124 * Analysis QMF Bank (14496-3 sp04 p206)
1125 *
1126 * @param x pointer to the beginning of the first sample window
1127 * @param W array of complex-valued samples split into subbands
1128 */
1129 static void sbr_qmf_analysis(DSPContext *dsp, RDFTContext *rdft, const float *in, float *x,
1130 float z[320], float W[2][32][32][2],
1131 float bias, float scale)
1132 {
1133 int i, k;
1134 memcpy(W[0], W[1], sizeof(W[0]));
1135 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1136 if (scale != 1.0f || bias != 0.0f)
1137 for (i = 0; i < 1024; i++)
1138 x[288 + i] = (in[i] - bias) * scale;
1139 else
1140 memcpy(x+288, in, 1024*sizeof(*x));
1141 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1142 // are not supported
1143 float re, im;
1144 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1145 for (k = 0; k < 64; k++) {
1146 float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
1147 z[k] = f * analysis_cos_pre[k];
1148 z[k+64] = f;
1149 }
1150 ff_rdft_calc(rdft, z);
1151 re = z[0] * 0.5f;
1152 im = 0.5f * dsp->scalarproduct_float(z+64, analysis_sin_pre, 64);
1153 W[1][i][0][0] = re * analysis_cossin_post[0][0] - im * analysis_cossin_post[0][1];
1154 W[1][i][0][1] = re * analysis_cossin_post[0][1] + im * analysis_cossin_post[0][0];
1155 for (k = 1; k < 32; k++) {
1156 re = z[2*k ] - re;
1157 im = z[2*k+1] - im;
1158 W[1][i][k][0] = re * analysis_cossin_post[k][0] - im * analysis_cossin_post[k][1];
1159 W[1][i][k][1] = re * analysis_cossin_post[k][1] + im * analysis_cossin_post[k][0];
1160 }
1161 x += 32;
1162 }
1163 }
1164
1165 /**
1166 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1167 * (14496-3 sp04 p206)
1168 */
1169 static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1170 float *out, float X[2][32][64],
1171 float mdct_buf[2][64],
1172 float *v0, int *v_off, const unsigned int div,
1173 float bias, float scale)
1174 {
1175 int i, n;
1176 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1177 int scale_and_bias = scale != 1.0f || bias != 0.0f;
1178 float *v;
1179 for (i = 0; i < 32; i++) {
1180 if (*v_off == 0) {
1181 int saved_samples = (1280 - 128) >> div;
1182 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1183 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
1184 } else {
1185 *v_off -= 128 >> div;
1186 }
1187 v = v0 + *v_off;
1188 for (n = 1; n < 64 >> div; n+=2) {
1189 X[1][i][n] = -X[1][i][n];
1190 }
1191 if (div) {
1192 memset(X[0][i]+32, 0, 32*sizeof(float));
1193 memset(X[1][i]+32, 0, 32*sizeof(float));
1194 }
1195 ff_imdct_half(mdct, mdct_buf[0], X[0][i]);
1196 ff_imdct_half(mdct, mdct_buf[1], X[1][i]);
1197 if (div) {
1198 for (n = 0; n < 32; n++) {
1199 v[ n] = -mdct_buf[0][63 - 2*n] + mdct_buf[1][2*n ];
1200 v[ 63 - n] = mdct_buf[0][62 - 2*n] + mdct_buf[1][2*n + 1];
1201 }
1202 } else {
1203 for (n = 0; n < 64; n++) {
1204 v[ n] = -mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1205 v[127 - n] = mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1206 }
1207 }
1208 dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1209 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1210 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1211 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1212 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1213 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1214 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1215 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1216 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1217 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1218 if (scale_and_bias)
1219 for (n = 0; n < 64 >> div; n++)
1220 out[n] = out[n] * scale + bias;
1221 out += 64 >> div;
1222 }
1223 }
1224
1225 static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
1226 {
1227 int i;
1228 float real_sum = 0.0f;
1229 float imag_sum = 0.0f;
1230 if (lag) {
1231 for (i = 1; i < 38; i++) {
1232 real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
1233 imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
1234 }
1235 phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
1236 phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
1237 if (lag == 1) {
1238 phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
1239 phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
1240 }
1241 } else {
1242 for (i = 1; i < 38; i++) {
1243 real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
1244 }
1245 phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
1246 phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
1247 }
1248 }
1249
1250 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1251 * (14496-3 sp04 p214)
1252 * Warning: This routine does not seem numerically stable.
1253 */
1254 static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2],
1255 const float X_low[32][40][2], int k0)
1256 {
1257 int k;
1258 for (k = 0; k < k0; k++) {
1259 float phi[3][2][2], dk;
1260
1261 autocorrelate(X_low[k], phi, 0);
1262 autocorrelate(X_low[k], phi, 1);
1263 autocorrelate(X_low[k], phi, 2);
1264
1265 dk = phi[2][1][0] * phi[1][0][0] -
1266 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1267
1268 if (!dk) {
1269 alpha1[k][0] = 0;
1270 alpha1[k][1] = 0;
1271 } else {
1272 float temp_real, temp_im;
1273 temp_real = phi[0][0][0] * phi[1][1][0] -
1274 phi[0][0][1] * phi[1][1][1] -
1275 phi[0][1][0] * phi[1][0][0];
1276 temp_im = phi[0][0][0] * phi[1][1][1] +
1277 phi[0][0][1] * phi[1][1][0] -
1278 phi[0][1][1] * phi[1][0][0];
1279
1280 alpha1[k][0] = temp_real / dk;
1281 alpha1[k][1] = temp_im / dk;
1282 }
1283
1284 if (!phi[1][0][0]) {
1285 alpha0[k][0] = 0;
1286 alpha0[k][1] = 0;
1287 } else {
1288 float temp_real, temp_im;
1289 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1290 alpha1[k][1] * phi[1][1][1];
1291 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1292 alpha1[k][0] * phi[1][1][1];
1293
1294 alpha0[k][0] = -temp_real / phi[1][0][0];
1295 alpha0[k][1] = -temp_im / phi[1][0][0];
1296 }
1297
1298 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1299 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1300 alpha1[k][0] = 0;
1301 alpha1[k][1] = 0;
1302 alpha0[k][0] = 0;
1303 alpha0[k][1] = 0;
1304 }
1305 }
1306 }
1307
1308 /// Chirp Factors (14496-3 sp04 p214)
1309 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1310 {
1311 int i;
1312 float new_bw;
1313 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1314
1315 for (i = 0; i < sbr->n_q; i++) {
1316 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1317 new_bw = 0.6f;
1318 } else
1319 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1320
1321 if (new_bw < ch_data->bw_array[i]) {
1322 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1323 } else
1324 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1325 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1326 }
1327 }
1328
1329 /// Generate the subband filtered lowband
1330 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1331 float X_low[32][40][2], const float W[2][32][32][2])
1332 {
1333 int i, k;
1334 const int t_HFGen = 8;
1335 const int i_f = 32;
1336 memset(X_low, 0, 32*sizeof(*X_low));
1337 for (k = 0; k < sbr->kx[1]; k++) {
1338 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1339 X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1340 X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1341 }
1342 }
1343 for (k = 0; k < sbr->kx[0]; k++) {
1344 for (i = 0; i < t_HFGen; i++) {
1345 X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1346 X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1347 }
1348 }
1349 return 0;
1350 }
1351
1352 /// High Frequency Generator (14496-3 sp04 p215)
1353 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1354 float X_high[64][40][2], const float X_low[32][40][2],
1355 const float (*alpha0)[2], const float (*alpha1)[2],
1356 const float bw_array[5], const uint8_t *t_env,
1357 int bs_num_env)
1358 {
1359 int i, j, x;
1360 int g = 0;
1361 int k = sbr->kx[1];
1362 for (j = 0; j < sbr->num_patches; j++) {
1363 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1364 float alpha[4];
1365 const int p = sbr->patch_start_subband[j] + x;
1366 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1367 g++;
1368 g--;
1369
1370 if (g < 0) {
1371 av_log(ac->avccontext, AV_LOG_ERROR,
1372 "ERROR : no subband found for frequency %d\n", k);
1373 return -1;
1374 }
1375
1376 alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g];
1377 alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g];
1378 alpha[2] = alpha0[p][0] * bw_array[g];
1379 alpha[3] = alpha0[p][1] * bw_array[g];
1380
1381 for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) {
1382 const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET;
1383 X_high[k][idx][0] =
1384 X_low[p][idx - 2][0] * alpha[0] -
1385 X_low[p][idx - 2][1] * alpha[1] +
1386 X_low[p][idx - 1][0] * alpha[2] -
1387 X_low[p][idx - 1][1] * alpha[3] +
1388 X_low[p][idx][0];
1389 X_high[k][idx][1] =
1390 X_low[p][idx - 2][1] * alpha[0] +
1391 X_low[p][idx - 2][0] * alpha[1] +
1392 X_low[p][idx - 1][1] * alpha[2] +
1393 X_low[p][idx - 1][0] * alpha[3] +
1394 X_low[p][idx][1];
1395 }
1396 }
1397 }
1398 if (k < sbr->m[1] + sbr->kx[1])
1399 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1400
1401 return 0;
1402 }
1403
1404 /// Generate the subband filtered lowband
1405 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][32][64],
1406 const float X_low[32][40][2], const float Y[2][38][64][2],
1407 int ch)
1408 {
1409 int k, i;
1410 const int i_f = 32;
1411 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1412 memset(X, 0, 2*sizeof(*X));
1413 for (k = 0; k < sbr->kx[0]; k++) {
1414 for (i = 0; i < i_Temp; 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[0] + sbr->m[0]; k++) {
1420 for (i = 0; i < i_Temp; i++) {
1421 X[0][i][k] = Y[0][i + i_f][k][0];
1422 X[1][i][k] = Y[0][i + i_f][k][1];
1423 }
1424 }
1425
1426 for (k = 0; k < sbr->kx[1]; k++) {
1427 for (i = i_Temp; i < i_f; i++) {
1428 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1429 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1430 }
1431 }
1432 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1433 for (i = i_Temp; i < i_f; i++) {
1434 X[0][i][k] = Y[1][i][k][0];
1435 X[1][i][k] = Y[1][i][k][1];
1436 }
1437 }
1438 return 0;
1439 }
1440
1441 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1442 * (14496-3 sp04 p217)
1443 */
1444 static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1445 SBRData *ch_data, int e_a[2])
1446 {
1447 int e, i, m;
1448
1449 e_a[0] = -(e_a[1] != ch_data->bs_num_env[0]); // l_APrev
1450 e_a[1] = -1;
1451 if ((ch_data->bs_frame_class & 1) && ch_data->bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
1452 e_a[1] = ch_data->bs_num_env[1] + 1 - ch_data->bs_pointer;
1453 } else if ((ch_data->bs_frame_class == 2) && (ch_data->bs_pointer > 1)) // VARFIX and bs_pointer > 1
1454 e_a[1] = ch_data->bs_pointer - 1;
1455
1456 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1457 for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1458 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1459 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1460 int k;
1461
1462 for (i = 0; i < ilim; i++)
1463 for (m = table[i]; m < table[i + 1]; m++)
1464 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1465
1466 // ch_data->bs_num_noise > 1 => 2 noise floors
1467 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1468 for (i = 0; i < sbr->n_q; i++)
1469 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1470 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1471
1472 for (i = 0; i < sbr->n[1]; i++) {
1473 if (ch_data->bs_add_harmonic_flag) {
1474 const unsigned int m_midpoint =
1475 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1476
1477 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1478 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1479 }
1480 }
1481
1482 for (i = 0; i < ilim; i++) {
1483 int additional_sinusoid_present = 0;
1484 for (m = table[i]; m < table[i + 1]; m++) {
1485 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1486 additional_sinusoid_present = 1;
1487 break;
1488 }
1489 }
1490 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1491 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1492 }
1493 }
1494
1495 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env[1]], sizeof(ch_data->s_indexmapped[0]));
1496 }
1497
1498 /// Estimation of current envelope (14496-3 sp04 p218)
1499 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1500 SpectralBandReplication *sbr, SBRData *ch_data)
1501 {
1502 int e, i, m;
1503
1504 if (sbr->bs_interpol_freq) {
1505 for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1506 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1507 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1508 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1509
1510 for (m = 0; m < sbr->m[1]; m++) {
1511 float sum = 0.0f;
1512
1513 for (i = ilb; i < iub; i++) {
1514 sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] +
1515 X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1];
1516 }
1517 e_curr[e][m] = sum * recip_env_size;
1518 }
1519 }
1520 } else {
1521 int k, p;
1522
1523 for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1524 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1525 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1526 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1527 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1528
1529 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1530 float sum = 0.0f;
1531 const int den = env_size * (table[p + 1] - table[p]);
1532
1533 for (k = table[p]; k < table[p + 1]; k++) {
1534 for (i = ilb; i < iub; i++) {
1535 sum += X_high[k][i][0] * X_high[k][i][0] +
1536 X_high[k][i][1] * X_high[k][i][1];
1537 }
1538 }
1539 sum /= den;
1540 for (k = table[p]; k < table[p + 1]; k++) {
1541 e_curr[e][k - sbr->kx[1]] = sum;
1542 }
1543 }
1544 }
1545 }
1546 }
1547
1548 /**
1549 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1550 * and Calculation of gain (14496-3 sp04 p219)
1551 */
1552 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1553 SBRData *ch_data, const int e_a[2])
1554 {
1555 int e, k, m;
1556 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1557 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1558
1559 for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1560 int delta = !((e == e_a[1]) || (e == e_a[0]));
1561 for (k = 0; k < sbr->n_lim; k++) {
1562 float gain_boost, gain_max;
1563 float sum[2] = { 0.0f, 0.0f };
1564 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1565 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1566 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1567 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1568 if (!sbr->s_mapped[e][m]) {
1569 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1570 ((1.0f + sbr->e_curr[e][m]) *
1571 (1.0f + sbr->q_mapped[e][m] * delta)));
1572 } else {
1573 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1574 ((1.0f + sbr->e_curr[e][m]) *
1575 (1.0f + sbr->q_mapped[e][m])));
1576 }
1577 }
1578 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1579 sum[0] += sbr->e_origmapped[e][m];
1580 sum[1] += sbr->e_curr[e][m];
1581 }
1582 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1583 gain_max = FFMIN(100000, gain_max);
1584 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1585 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1586 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1587 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1588 }
1589 sum[0] = sum[1] = 0.0f;
1590 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1591 sum[0] += sbr->e_origmapped[e][m];
1592 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1593 + sbr->s_m[e][m] * sbr->s_m[e][m]
1594 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1595 }
1596 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1597 gain_boost = FFMIN(1.584893192, gain_boost);
1598 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1599 sbr->gain[e][m] *= gain_boost;
1600 sbr->q_m[e][m] *= gain_boost;
1601 sbr->s_m[e][m] *= gain_boost;
1602 }
1603 }
1604 }
1605 }
1606
1607 /// Assembling HF Signals (14496-3 sp04 p220)
1608 static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2],
1609 SpectralBandReplication *sbr, SBRData *ch_data,
1610 const int e_a[2])
1611 {
1612 int e, i, j, m;
1613 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1614 const int kx = sbr->kx[1];
1615 const int m_max = sbr->m[1];
1616 static const float h_smooth[5] = {
1617 0.33333333333333,
1618 0.30150283239582,
1619 0.21816949906249,
1620 0.11516383427084,
1621 0.03183050093751,
1622 };
1623 static const int8_t phi[2][4] = {
1624 { 1, 0, -1, 0}, // real
1625 { 0, 1, 0, -1}, // imaginary
1626 };
1627 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1628 int indexnoise = ch_data->f_indexnoise;
1629 int indexsine = ch_data->f_indexsine;
1630 memcpy(Y[0], Y[1], sizeof(Y[0]));
1631
1632 if (sbr->reset) {
1633 for (i = 0; i < h_SL; i++) {
1634 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1635 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1636 }
1637 } else if (h_SL) {
1638 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1639 memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1640 }
1641
1642 for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1643 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1644 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1645 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1646 }
1647 }
1648
1649 for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1650 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1651 int phi_sign = (1 - 2*(kx & 1));
1652
1653 if (h_SL && e != e_a[0] && e != e_a[1]) {
1654 for (m = 0; m < m_max; m++) {
1655 const int idx1 = i + h_SL;
1656 float g_filt = 0.0f;
1657 for (j = 0; j <= h_SL; j++)
1658 g_filt += g_temp[idx1 - j][m] * h_smooth[j];
1659 Y[1][i][m + kx][0] =
1660 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1661 Y[1][i][m + kx][1] =
1662 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1663 }
1664 } else {
1665 for (m = 0; m < m_max; m++) {
1666 const float g_filt = g_temp[i + h_SL][m];
1667 Y[1][i][m + kx][0] =
1668 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1669 Y[1][i][m + kx][1] =
1670 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1671 }
1672 }
1673
1674 if (e != e_a[0] && e != e_a[1]) {
1675 for (m = 0; m < m_max; m++) {
1676 indexnoise = (indexnoise + 1) & 0x1ff;
1677 if (sbr->s_m[e][m]) {
1678 Y[1][i][m + kx][0] +=
1679 sbr->s_m[e][m] * phi[0][indexsine];
1680 Y[1][i][m + kx][1] +=
1681 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1682 } else {
1683 float q_filt;
1684 if (h_SL) {
1685 const int idx1 = i + h_SL;
1686 q_filt = 0.0f;
1687 for (j = 0; j <= h_SL; j++)
1688 q_filt += q_temp[idx1 - j][m] * h_smooth[j];
1689 } else {
1690 q_filt = q_temp[i][m];
1691 }
1692 Y[1][i][m + kx][0] +=
1693 q_filt * sbr_noise_table[indexnoise][0];
1694 Y[1][i][m + kx][1] +=
1695 q_filt * sbr_noise_table[indexnoise][1];
1696 }
1697 phi_sign = -phi_sign;
1698 }
1699 } else {
1700 indexnoise = (indexnoise + m_max) & 0x1ff;
1701 for (m = 0; m < m_max; m++) {
1702 Y[1][i][m + kx][0] +=
1703 sbr->s_m[e][m] * phi[0][indexsine];
1704 Y[1][i][m + kx][1] +=
1705 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1706 phi_sign = -phi_sign;
1707 }
1708 }
1709 indexsine = (indexsine + 1) & 3;
1710 }
1711 }
1712 ch_data->f_indexnoise = indexnoise;
1713 ch_data->f_indexsine = indexsine;
1714 }
1715
1716 void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac)
1717 {
1718 int ch;
1719
1720 if (sbr->start) {
1721 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1722 sbr_time_freq_grid(ac, sbr, &sbr->data[ch], ch);
1723 }
1724 sbr_dequant(sbr, id_aac);
1725 }
1726 }
1727
1728 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
1729 const float* in, float* out)
1730 {
1731 int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
1732
1733 /* decode channel */
1734 sbr_qmf_analysis(&ac->dsp, &sbr->rdft, in, sbr->data[ch].analysis_filterbank_samples,
1735 (float*)sbr->qmf_filter_scratch,
1736 sbr->data[ch].W, ac->add_bias, 1/(-1024 * ac->sf_scale));
1737 sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1738 if (sbr->start) {
1739 sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1740 sbr_chirp(sbr, &sbr->data[ch]);
1741 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1742 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1743 sbr->data[ch].bs_num_env[1]);
1744
1745 // hf_adj
1746 sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1747 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1748 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1749 sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch],
1750 sbr->data[ch].e_a);
1751 }
1752
1753 /* synthesis */
1754 sbr_x_gen(sbr, sbr->X, sbr->X_low, sbr->data[ch].Y, ch);
1755 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, out, sbr->X, sbr->qmf_filter_scratch,
1756 sbr->data[ch].synthesis_filterbank_samples,
1757 &sbr->data[ch].synthesis_filterbank_samples_offset,
1758 downsampled,
1759 ac->add_bias, -1024 * ac->sf_scale);
1760 }
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