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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / aacsbr.c
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2ba45a60
DM		 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 */
55enum {
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 */
71enum {
72 FIXFIX,
73 FIXVAR,
74 VARFIX,
75 VARVAR,
76};
77
78enum {
79 EXTENSION_ID_PS = 2,
80};
81
82static VLC vlc_sbr[10];
83static 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
95static void aacsbr_func_ptr_init(AACSBRContext *c);
96
97av_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. */
133static 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
143av_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
161av_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
167static int qsort_comparison_function_int16(const void *a, const void *b)
168{
169 return *(const int16_t *)a - *(const int16_t *)b;
170}
171
172static 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)
182static 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
229static 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
283static 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
291static 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
309static 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)
326static 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)
515static 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)
566static 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
619static 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)) */
629static const int8_t ceil_log2[] = {
630 0, 1, 2, 2, 3, 3,
631};
632
633static 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
775static 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
793static 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
801static 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
811static 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
880static 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
916static 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
947static 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
967static 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
1009static 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
1050static 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 */
1071int 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)
1117static 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
1181static 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
1205static 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 */
1256static 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)
1311static 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
1332static 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)
1357static 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
1392static 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 */
1431static 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)
1486static 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 */
1532static 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)
1588static 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
1676void 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
1755static 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}
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