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>
6 * This file is part of FFmpeg.
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.
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.
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
25 * AAC Spectral Band Replication decoding functions
26 * @author Robert Swain ( rob opendot cl )
32 #include "aacsbrdata.h"
35 #include "libavutil/libm.h"
41 #define ENVELOPE_ADJUSTMENT_OFFSET 2
42 #define NOISE_FLOOR_OFFSET 6.0f
50 T_HUFFMAN_ENV_BAL_1_5DB,
51 F_HUFFMAN_ENV_BAL_1_5DB,
54 T_HUFFMAN_ENV_BAL_3_0DB,
55 F_HUFFMAN_ENV_BAL_3_0DB,
56 T_HUFFMAN_NOISE_3_0DB,
57 T_HUFFMAN_NOISE_BAL_3_0DB,
61 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
74 static VLC vlc_sbr[10];
75 static const int8_t vlc_sbr_lav[10] =
76 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
77 static const DECLARE_ALIGNED(16, float, zero64)[64];
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, \
85 #define SBR_VLC_ROW(name) \
86 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
88 av_cold void ff_aac_sbr_init(void)
92 const void *sbr_codes, *sbr_bits;
93 const unsigned int table_size, elem_size;
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),
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);
119 for (n = 1; n < 320; n++)
120 sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
121 sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
122 sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
124 for (n = 0; n < 320; n++)
125 sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
130 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
133 sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
134 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
135 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
136 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
137 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
138 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
139 * and scale back down at synthesis. */
140 mdct_scale = ac->avctx->sample_fmt == AV_SAMPLE_FMT_FLT ? 32768.0f : 1.0f;
141 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * mdct_scale));
142 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * mdct_scale);
143 ff_ps_ctx_init(&sbr->ps);
146 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
148 ff_mdct_end(&sbr->mdct);
149 ff_mdct_end(&sbr->mdct_ana);
152 static int qsort_comparison_function_int16(const void *a, const void *b)
154 return *(const int16_t *)a - *(const int16_t *)b;
157 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
160 for (i = 0; i <= last_el; i++)
161 if (table[i] == needle)
166 /// Limiter Frequency Band Table (14496-3 sp04 p198)
167 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
170 if (sbr->bs_limiter_bands > 0) {
171 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
172 1.18509277094158210129f, //2^(0.49/2)
173 1.11987160404675912501f }; //2^(0.49/3)
174 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
175 int16_t patch_borders[7];
176 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
178 patch_borders[0] = sbr->kx[1];
179 for (k = 1; k <= sbr->num_patches; k++)
180 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
182 memcpy(sbr->f_tablelim, sbr->f_tablelow,
183 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
184 if (sbr->num_patches > 1)
185 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
186 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
188 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
189 sizeof(sbr->f_tablelim[0]),
190 qsort_comparison_function_int16);
192 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
193 while (out < sbr->f_tablelim + sbr->n_lim) {
194 if (*in >= *out * lim_bands_per_octave_warped) {
196 } else if (*in == *out ||
197 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
200 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
208 sbr->f_tablelim[0] = sbr->f_tablelow[0];
209 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
214 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
216 unsigned int cnt = get_bits_count(gb);
217 uint8_t bs_header_extra_1;
218 uint8_t bs_header_extra_2;
219 int old_bs_limiter_bands = sbr->bs_limiter_bands;
220 SpectrumParameters old_spectrum_params;
224 // Save last spectrum parameters variables to compare to new ones
225 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
227 sbr->bs_amp_res_header = get_bits1(gb);
228 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
229 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
230 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
231 skip_bits(gb, 2); // bs_reserved
233 bs_header_extra_1 = get_bits1(gb);
234 bs_header_extra_2 = get_bits1(gb);
236 if (bs_header_extra_1) {
237 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
238 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
239 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
241 sbr->spectrum_params.bs_freq_scale = 2;
242 sbr->spectrum_params.bs_alter_scale = 1;
243 sbr->spectrum_params.bs_noise_bands = 2;
246 // Check if spectrum parameters changed
247 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
250 if (bs_header_extra_2) {
251 sbr->bs_limiter_bands = get_bits(gb, 2);
252 sbr->bs_limiter_gains = get_bits(gb, 2);
253 sbr->bs_interpol_freq = get_bits1(gb);
254 sbr->bs_smoothing_mode = get_bits1(gb);
256 sbr->bs_limiter_bands = 2;
257 sbr->bs_limiter_gains = 2;
258 sbr->bs_interpol_freq = 1;
259 sbr->bs_smoothing_mode = 1;
262 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
263 sbr_make_f_tablelim(sbr);
265 return get_bits_count(gb) - cnt;
268 static int array_min_int16(const int16_t *array, int nel)
270 int i, min = array[0];
271 for (i = 1; i < nel; i++)
272 min = FFMIN(array[i], min);
276 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
278 int k, previous, present;
281 base = powf((float)stop / start, 1.0f / num_bands);
285 for (k = 0; k < num_bands-1; k++) {
287 present = lrintf(prod);
288 bands[k] = present - previous;
291 bands[num_bands-1] = stop - previous;
294 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
296 // Requirements (14496-3 sp04 p205)
298 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
301 if (bs_xover_band >= n_master) {
302 av_log(avctx, AV_LOG_ERROR,
303 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
310 /// Master Frequency Band Table (14496-3 sp04 p194)
311 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
312 SpectrumParameters *spectrum)
314 unsigned int temp, max_qmf_subbands;
315 unsigned int start_min, stop_min;
317 const int8_t *sbr_offset_ptr;
320 if (sbr->sample_rate < 32000) {
322 } else if (sbr->sample_rate < 64000) {
327 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
328 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
330 switch (sbr->sample_rate) {
332 sbr_offset_ptr = sbr_offset[0];
335 sbr_offset_ptr = sbr_offset[1];
338 sbr_offset_ptr = sbr_offset[2];
341 sbr_offset_ptr = sbr_offset[3];
343 case 44100: case 48000: case 64000:
344 sbr_offset_ptr = sbr_offset[4];
346 case 88200: case 96000: case 128000: case 176400: case 192000:
347 sbr_offset_ptr = sbr_offset[5];
350 av_log(ac->avctx, AV_LOG_ERROR,
351 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
355 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
357 if (spectrum->bs_stop_freq < 14) {
358 sbr->k[2] = stop_min;
359 make_bands(stop_dk, stop_min, 64, 13);
360 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
361 for (k = 0; k < spectrum->bs_stop_freq; k++)
362 sbr->k[2] += stop_dk[k];
363 } else if (spectrum->bs_stop_freq == 14) {
364 sbr->k[2] = 2*sbr->k[0];
365 } else if (spectrum->bs_stop_freq == 15) {
366 sbr->k[2] = 3*sbr->k[0];
368 av_log(ac->avctx, AV_LOG_ERROR,
369 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
372 sbr->k[2] = FFMIN(64, sbr->k[2]);
374 // Requirements (14496-3 sp04 p205)
375 if (sbr->sample_rate <= 32000) {
376 max_qmf_subbands = 48;
377 } else if (sbr->sample_rate == 44100) {
378 max_qmf_subbands = 35;
379 } else if (sbr->sample_rate >= 48000)
380 max_qmf_subbands = 32;
382 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
383 av_log(ac->avctx, AV_LOG_ERROR,
384 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
388 if (!spectrum->bs_freq_scale) {
391 dk = spectrum->bs_alter_scale + 1;
392 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
393 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
396 for (k = 1; k <= sbr->n_master; k++)
397 sbr->f_master[k] = dk;
399 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
402 sbr->f_master[2]-= (k2diff < -1);
404 sbr->f_master[sbr->n_master]++;
407 sbr->f_master[0] = sbr->k[0];
408 for (k = 1; k <= sbr->n_master; k++)
409 sbr->f_master[k] += sbr->f_master[k - 1];
412 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
413 int two_regions, num_bands_0;
414 int vdk0_max, vdk1_min;
417 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
419 sbr->k[1] = 2 * sbr->k[0];
422 sbr->k[1] = sbr->k[2];
425 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
427 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
428 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
434 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
436 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
437 vdk0_max = vk0[num_bands_0];
440 for (k = 1; k <= num_bands_0; k++) {
441 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
442 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
450 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
451 : 1.0f; // bs_alter_scale = {0,1}
452 int num_bands_1 = lrintf(half_bands * invwarp *
453 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
455 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
457 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
459 if (vdk1_min < vdk0_max) {
461 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
462 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
464 vk1[num_bands_1] -= change;
467 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
470 for (k = 1; k <= num_bands_1; k++) {
471 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
472 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
478 sbr->n_master = num_bands_0 + num_bands_1;
479 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
481 memcpy(&sbr->f_master[0], vk0,
482 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
483 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
484 num_bands_1 * sizeof(sbr->f_master[0]));
487 sbr->n_master = num_bands_0;
488 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
490 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
497 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
498 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
502 int usb = sbr->kx[1];
503 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
505 sbr->num_patches = 0;
507 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
508 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
514 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
515 sb = sbr->f_master[i];
516 odd = (sb + sbr->k[0]) & 1;
519 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
520 // After this check the final number of patches can still be six which is
521 // illegal however the Coding Technologies decoder check stream has a final
522 // count of 6 patches
523 if (sbr->num_patches > 5) {
524 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
528 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
529 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
531 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
538 if (sbr->f_master[k] - sb < 3)
540 } while (sb != sbr->kx[1] + sbr->m[1]);
542 if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
548 /// Derived Frequency Band Tables (14496-3 sp04 p197)
549 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
553 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
554 sbr->n[0] = (sbr->n[1] + 1) >> 1;
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];
561 // Requirements (14496-3 sp04 p205)
562 if (sbr->kx[1] + sbr->m[1] > 64) {
563 av_log(ac->avctx, AV_LOG_ERROR,
564 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
567 if (sbr->kx[1] > 32) {
568 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
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];
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
580 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
584 sbr->f_tablenoise[0] = sbr->f_tablelow[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];
591 if (sbr_hf_calc_npatches(ac, sbr) < 0)
594 sbr_make_f_tablelim(sbr);
596 sbr->data[0].f_indexnoise = 0;
597 sbr->data[1].f_indexnoise = 0;
602 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
606 for (i = 0; i < elements; i++) {
607 vec[i] = get_bits1(gb);
611 /** ceil(log2(index+1)) */
612 static const int8_t ceil_log2[] = {
616 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
617 GetBitContext *gb, SBRData *ch_data)
620 unsigned bs_pointer = 0;
621 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
622 int abs_bord_trail = 16;
623 int num_rel_lead, num_rel_trail;
624 unsigned bs_num_env_old = ch_data->bs_num_env;
626 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
627 ch_data->bs_amp_res = sbr->bs_amp_res_header;
628 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
630 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
632 ch_data->bs_num_env = 1 << get_bits(gb, 2);
633 num_rel_lead = ch_data->bs_num_env - 1;
634 if (ch_data->bs_num_env == 1)
635 ch_data->bs_amp_res = 0;
637 if (ch_data->bs_num_env > 4) {
638 av_log(ac->avctx, AV_LOG_ERROR,
639 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
640 ch_data->bs_num_env);
644 ch_data->t_env[0] = 0;
645 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
647 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
649 for (i = 0; i < num_rel_lead; i++)
650 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
652 ch_data->bs_freq_res[1] = get_bits1(gb);
653 for (i = 1; i < ch_data->bs_num_env; i++)
654 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
657 abs_bord_trail += get_bits(gb, 2);
658 num_rel_trail = get_bits(gb, 2);
659 ch_data->bs_num_env = num_rel_trail + 1;
660 ch_data->t_env[0] = 0;
661 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
663 for (i = 0; i < num_rel_trail; i++)
664 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
665 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
667 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
669 for (i = 0; i < ch_data->bs_num_env; i++)
670 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
673 ch_data->t_env[0] = get_bits(gb, 2);
674 num_rel_lead = get_bits(gb, 2);
675 ch_data->bs_num_env = num_rel_lead + 1;
676 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
678 for (i = 0; i < num_rel_lead; i++)
679 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
681 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
683 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
686 ch_data->t_env[0] = get_bits(gb, 2);
687 abs_bord_trail += get_bits(gb, 2);
688 num_rel_lead = get_bits(gb, 2);
689 num_rel_trail = get_bits(gb, 2);
690 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
692 if (ch_data->bs_num_env > 5) {
693 av_log(ac->avctx, AV_LOG_ERROR,
694 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
695 ch_data->bs_num_env);
699 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
701 for (i = 0; i < num_rel_lead; i++)
702 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
703 for (i = 0; i < num_rel_trail; i++)
704 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
705 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
707 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
709 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
713 if (bs_pointer > ch_data->bs_num_env + 1) {
714 av_log(ac->avctx, AV_LOG_ERROR,
715 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
720 for (i = 1; i <= ch_data->bs_num_env; i++) {
721 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
722 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
727 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
729 ch_data->t_q[0] = ch_data->t_env[0];
730 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
731 if (ch_data->bs_num_noise > 1) {
733 if (ch_data->bs_frame_class == FIXFIX) {
734 idx = ch_data->bs_num_env >> 1;
735 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
736 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
740 else if (bs_pointer == 1)
741 idx = ch_data->bs_num_env - 1;
742 else // bs_pointer > 1
743 idx = bs_pointer - 1;
745 ch_data->t_q[1] = ch_data->t_env[idx];
748 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
749 ch_data->e_a[1] = -1;
750 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
751 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
752 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
753 ch_data->e_a[1] = bs_pointer - 1;
758 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
759 //These variables are saved from the previous frame rather than copied
760 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
761 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
762 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
764 //These variables are read from the bitstream and therefore copied
765 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
766 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
767 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
768 dst->bs_num_env = src->bs_num_env;
769 dst->bs_amp_res = src->bs_amp_res;
770 dst->bs_num_noise = src->bs_num_noise;
771 dst->bs_frame_class = src->bs_frame_class;
772 dst->e_a[1] = src->e_a[1];
775 /// Read how the envelope and noise floor data is delta coded
776 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
779 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
780 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
783 /// Read inverse filtering data
784 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
789 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
790 for (i = 0; i < sbr->n_q; i++)
791 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
794 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
795 SBRData *ch_data, int ch)
799 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
801 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
802 const int odd = sbr->n[1] & 1;
804 if (sbr->bs_coupling && ch) {
805 if (ch_data->bs_amp_res) {
807 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
808 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
809 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
810 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
813 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
814 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
815 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
816 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
819 if (ch_data->bs_amp_res) {
821 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
822 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
823 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
824 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
827 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
828 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
829 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
830 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
834 for (i = 0; i < ch_data->bs_num_env; i++) {
835 if (ch_data->bs_df_env[i]) {
836 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
837 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
838 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
839 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
840 } else if (ch_data->bs_freq_res[i + 1]) {
841 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
842 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
843 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
846 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
847 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
848 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
852 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
853 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
854 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);
858 //assign 0th elements of env_facs from last elements
859 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
860 sizeof(ch_data->env_facs[0]));
863 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
864 SBRData *ch_data, int ch)
867 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
869 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
871 if (sbr->bs_coupling && ch) {
872 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
873 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
874 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
875 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
877 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
878 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
879 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
880 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
883 for (i = 0; i < ch_data->bs_num_noise; i++) {
884 if (ch_data->bs_df_noise[i]) {
885 for (j = 0; j < sbr->n_q; j++)
886 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
888 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
889 for (j = 1; j < sbr->n_q; j++)
890 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);
894 //assign 0th elements of noise_facs from last elements
895 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
896 sizeof(ch_data->noise_facs[0]));
899 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
901 int bs_extension_id, int *num_bits_left)
903 switch (bs_extension_id) {
904 case EXTENSION_ID_PS:
906 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
907 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
911 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
913 av_log_missing_feature(ac->avctx, "Parametric Stereo is", 0);
914 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
920 av_log_missing_feature(ac->avctx, "Reserved SBR extensions are", 1);
921 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
927 static int read_sbr_single_channel_element(AACContext *ac,
928 SpectralBandReplication *sbr,
931 if (get_bits1(gb)) // bs_data_extra
932 skip_bits(gb, 4); // bs_reserved
934 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
936 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
937 read_sbr_invf(sbr, gb, &sbr->data[0]);
938 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
939 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
941 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
942 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
947 static int read_sbr_channel_pair_element(AACContext *ac,
948 SpectralBandReplication *sbr,
951 if (get_bits1(gb)) // bs_data_extra
952 skip_bits(gb, 8); // bs_reserved
954 if ((sbr->bs_coupling = get_bits1(gb))) {
955 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
957 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
958 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
959 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
960 read_sbr_invf(sbr, gb, &sbr->data[0]);
961 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
962 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
963 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
964 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
965 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
966 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
968 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
969 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
971 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
972 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
973 read_sbr_invf(sbr, gb, &sbr->data[0]);
974 read_sbr_invf(sbr, gb, &sbr->data[1]);
975 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
976 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
977 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
978 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
981 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
982 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
983 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
984 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
989 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
990 GetBitContext *gb, int id_aac)
992 unsigned int cnt = get_bits_count(gb);
994 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
995 if (read_sbr_single_channel_element(ac, sbr, gb)) {
997 return get_bits_count(gb) - cnt;
999 } else if (id_aac == TYPE_CPE) {
1000 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1002 return get_bits_count(gb) - cnt;
1005 av_log(ac->avctx, AV_LOG_ERROR,
1006 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1008 return get_bits_count(gb) - cnt;
1010 if (get_bits1(gb)) { // bs_extended_data
1011 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1012 if (num_bits_left == 15)
1013 num_bits_left += get_bits(gb, 8); // bs_esc_count
1015 num_bits_left <<= 3;
1016 while (num_bits_left > 7) {
1018 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1020 if (num_bits_left < 0) {
1021 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1023 if (num_bits_left > 0)
1024 skip_bits(gb, num_bits_left);
1027 return get_bits_count(gb) - cnt;
1030 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1033 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1035 err = sbr_make_f_derived(ac, sbr);
1037 av_log(ac->avctx, AV_LOG_ERROR,
1038 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1044 * Decode Spectral Band Replication extension data; reference: table 4.55.
1046 * @param crc flag indicating the presence of CRC checksum
1047 * @param cnt length of TYPE_FIL syntactic element in bytes
1049 * @return Returns number of bytes consumed from the TYPE_FIL element.
1051 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1052 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1054 unsigned int num_sbr_bits = 0, num_align_bits;
1055 unsigned bytes_read;
1056 GetBitContext gbc = *gb_host, *gb = &gbc;
1057 skip_bits_long(gb_host, cnt*8 - 4);
1061 if (!sbr->sample_rate)
1062 sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1063 if (!ac->m4ac.ext_sample_rate)
1064 ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
1067 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1071 //Save some state from the previous frame.
1072 sbr->kx[0] = sbr->kx[1];
1073 sbr->m[0] = sbr->m[1];
1076 if (get_bits1(gb)) // bs_header_flag
1077 num_sbr_bits += read_sbr_header(sbr, gb);
1083 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1085 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1086 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1088 if (bytes_read > cnt) {
1089 av_log(ac->avctx, AV_LOG_ERROR,
1090 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1095 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1096 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1101 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1102 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1103 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1104 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1105 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1106 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1107 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1108 float fac = temp1 / (1.0f + temp2);
1109 sbr->data[0].env_facs[e][k] = fac;
1110 sbr->data[1].env_facs[e][k] = fac * temp2;
1113 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1114 for (k = 0; k < sbr->n_q; k++) {
1115 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1116 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1117 float fac = temp1 / (1.0f + temp2);
1118 sbr->data[0].noise_facs[e][k] = fac;
1119 sbr->data[1].noise_facs[e][k] = fac * temp2;
1122 } else { // SCE or one non-coupled CPE
1123 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1124 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1125 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1126 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1127 sbr->data[ch].env_facs[e][k] =
1128 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1129 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1130 for (k = 0; k < sbr->n_q; k++)
1131 sbr->data[ch].noise_facs[e][k] =
1132 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1138 * Analysis QMF Bank (14496-3 sp04 p206)
1140 * @param x pointer to the beginning of the first sample window
1141 * @param W array of complex-valued samples split into subbands
1143 static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct, const float *in, float *x,
1144 float z[320], float W[2][32][32][2])
1147 memcpy(W[0], W[1], sizeof(W[0]));
1148 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1149 memcpy(x+288, in, 1024*sizeof(x[0]));
1150 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1151 // are not supported
1152 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1153 for (k = 0; k < 64; k++) {
1154 float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
1159 for (k = 1; k < 32; k++) {
1160 z[64+2*k-1] = z[ k];
1161 z[64+2*k ] = -z[64-k];
1165 mdct->imdct_half(mdct, z, z+64);
1166 for (k = 0; k < 32; k++) {
1167 W[1][i][k][0] = -z[63-k];
1168 W[1][i][k][1] = z[k];
1175 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1176 * (14496-3 sp04 p206)
1178 static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1179 float *out, float X[2][38][64],
1180 float mdct_buf[2][64],
1181 float *v0, int *v_off, const unsigned int div)
1184 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1186 for (i = 0; i < 32; i++) {
1188 int saved_samples = (1280 - 128) >> div;
1189 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1190 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
1192 *v_off -= 128 >> div;
1196 for (n = 0; n < 32; n++) {
1197 X[0][i][ n] = -X[0][i][n];
1198 X[0][i][32+n] = X[1][i][31-n];
1200 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1201 for (n = 0; n < 32; n++) {
1202 v[ n] = mdct_buf[0][63 - 2*n];
1203 v[63 - n] = -mdct_buf[0][62 - 2*n];
1206 for (n = 1; n < 64; n+=2) {
1207 X[1][i][n] = -X[1][i][n];
1209 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1210 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1211 for (n = 0; n < 64; n++) {
1212 v[ n] = -mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1213 v[127 - n] = mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1216 dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1217 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1218 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1219 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1220 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1221 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1222 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1223 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1224 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1225 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1230 static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
1233 float real_sum = 0.0f;
1234 float imag_sum = 0.0f;
1236 for (i = 1; i < 38; i++) {
1237 real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
1238 imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
1240 phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
1241 phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
1243 phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
1244 phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
1247 for (i = 1; i < 38; i++) {
1248 real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
1250 phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
1251 phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
1255 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1256 * (14496-3 sp04 p214)
1257 * Warning: This routine does not seem numerically stable.
1259 static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2],
1260 const float X_low[32][40][2], int k0)
1263 for (k = 0; k < k0; k++) {
1264 float phi[3][2][2], dk;
1266 autocorrelate(X_low[k], phi, 0);
1267 autocorrelate(X_low[k], phi, 1);
1268 autocorrelate(X_low[k], phi, 2);
1270 dk = phi[2][1][0] * phi[1][0][0] -
1271 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1277 float temp_real, temp_im;
1278 temp_real = phi[0][0][0] * phi[1][1][0] -
1279 phi[0][0][1] * phi[1][1][1] -
1280 phi[0][1][0] * phi[1][0][0];
1281 temp_im = phi[0][0][0] * phi[1][1][1] +
1282 phi[0][0][1] * phi[1][1][0] -
1283 phi[0][1][1] * phi[1][0][0];
1285 alpha1[k][0] = temp_real / dk;
1286 alpha1[k][1] = temp_im / dk;
1289 if (!phi[1][0][0]) {
1293 float temp_real, temp_im;
1294 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1295 alpha1[k][1] * phi[1][1][1];
1296 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1297 alpha1[k][0] * phi[1][1][1];
1299 alpha0[k][0] = -temp_real / phi[1][0][0];
1300 alpha0[k][1] = -temp_im / phi[1][0][0];
1303 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1304 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1313 /// Chirp Factors (14496-3 sp04 p214)
1314 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1318 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1320 for (i = 0; i < sbr->n_q; i++) {
1321 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1324 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1326 if (new_bw < ch_data->bw_array[i]) {
1327 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1329 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1330 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1334 /// Generate the subband filtered lowband
1335 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1336 float X_low[32][40][2], const float W[2][32][32][2])
1339 const int t_HFGen = 8;
1341 memset(X_low, 0, 32*sizeof(*X_low));
1342 for (k = 0; k < sbr->kx[1]; k++) {
1343 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1344 X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1345 X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1348 for (k = 0; k < sbr->kx[0]; k++) {
1349 for (i = 0; i < t_HFGen; i++) {
1350 X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1351 X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1357 /// High Frequency Generator (14496-3 sp04 p215)
1358 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1359 float X_high[64][40][2], const float X_low[32][40][2],
1360 const float (*alpha0)[2], const float (*alpha1)[2],
1361 const float bw_array[5], const uint8_t *t_env,
1367 for (j = 0; j < sbr->num_patches; j++) {
1368 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1370 const int p = sbr->patch_start_subband[j] + x;
1371 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1376 av_log(ac->avctx, AV_LOG_ERROR,
1377 "ERROR : no subband found for frequency %d\n", k);
1381 alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g];
1382 alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g];
1383 alpha[2] = alpha0[p][0] * bw_array[g];
1384 alpha[3] = alpha0[p][1] * bw_array[g];
1386 for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) {
1387 const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET;
1389 X_low[p][idx - 2][0] * alpha[0] -
1390 X_low[p][idx - 2][1] * alpha[1] +
1391 X_low[p][idx - 1][0] * alpha[2] -
1392 X_low[p][idx - 1][1] * alpha[3] +
1395 X_low[p][idx - 2][1] * alpha[0] +
1396 X_low[p][idx - 2][0] * alpha[1] +
1397 X_low[p][idx - 1][1] * alpha[2] +
1398 X_low[p][idx - 1][0] * alpha[3] +
1403 if (k < sbr->m[1] + sbr->kx[1])
1404 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1409 /// Generate the subband filtered lowband
1410 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1411 const float X_low[32][40][2], const float Y[2][38][64][2],
1416 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1417 memset(X, 0, 2*sizeof(*X));
1418 for (k = 0; k < sbr->kx[0]; k++) {
1419 for (i = 0; i < i_Temp; i++) {
1420 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1421 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1424 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1425 for (i = 0; i < i_Temp; i++) {
1426 X[0][i][k] = Y[0][i + i_f][k][0];
1427 X[1][i][k] = Y[0][i + i_f][k][1];
1431 for (k = 0; k < sbr->kx[1]; k++) {
1432 for (i = i_Temp; i < 38; i++) {
1433 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1434 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1437 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1438 for (i = i_Temp; i < i_f; i++) {
1439 X[0][i][k] = Y[1][i][k][0];
1440 X[1][i][k] = Y[1][i][k][1];
1446 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1447 * (14496-3 sp04 p217)
1449 static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1450 SBRData *ch_data, int e_a[2])
1454 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1455 for (e = 0; e < ch_data->bs_num_env; e++) {
1456 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1457 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1460 for (i = 0; i < ilim; i++)
1461 for (m = table[i]; m < table[i + 1]; m++)
1462 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1464 // ch_data->bs_num_noise > 1 => 2 noise floors
1465 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1466 for (i = 0; i < sbr->n_q; i++)
1467 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1468 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1470 for (i = 0; i < sbr->n[1]; i++) {
1471 if (ch_data->bs_add_harmonic_flag) {
1472 const unsigned int m_midpoint =
1473 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1475 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1476 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1480 for (i = 0; i < ilim; i++) {
1481 int additional_sinusoid_present = 0;
1482 for (m = table[i]; m < table[i + 1]; m++) {
1483 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1484 additional_sinusoid_present = 1;
1488 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1489 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1493 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1496 /// Estimation of current envelope (14496-3 sp04 p218)
1497 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1498 SpectralBandReplication *sbr, SBRData *ch_data)
1502 if (sbr->bs_interpol_freq) {
1503 for (e = 0; e < ch_data->bs_num_env; e++) {
1504 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1505 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1506 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1508 for (m = 0; m < sbr->m[1]; m++) {
1511 for (i = ilb; i < iub; i++) {
1512 sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] +
1513 X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1];
1515 e_curr[e][m] = sum * recip_env_size;
1521 for (e = 0; e < ch_data->bs_num_env; e++) {
1522 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1523 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1524 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1525 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1527 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1529 const int den = env_size * (table[p + 1] - table[p]);
1531 for (k = table[p]; k < table[p + 1]; k++) {
1532 for (i = ilb; i < iub; i++) {
1533 sum += X_high[k][i][0] * X_high[k][i][0] +
1534 X_high[k][i][1] * X_high[k][i][1];
1538 for (k = table[p]; k < table[p + 1]; k++) {
1539 e_curr[e][k - sbr->kx[1]] = sum;
1547 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1548 * and Calculation of gain (14496-3 sp04 p219)
1550 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1551 SBRData *ch_data, const int e_a[2])
1554 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1555 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1557 for (e = 0; e < ch_data->bs_num_env; e++) {
1558 int delta = !((e == e_a[1]) || (e == e_a[0]));
1559 for (k = 0; k < sbr->n_lim; k++) {
1560 float gain_boost, gain_max;
1561 float sum[2] = { 0.0f, 0.0f };
1562 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1563 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1564 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1565 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1566 if (!sbr->s_mapped[e][m]) {
1567 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1568 ((1.0f + sbr->e_curr[e][m]) *
1569 (1.0f + sbr->q_mapped[e][m] * delta)));
1571 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1572 ((1.0f + sbr->e_curr[e][m]) *
1573 (1.0f + sbr->q_mapped[e][m])));
1576 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1577 sum[0] += sbr->e_origmapped[e][m];
1578 sum[1] += sbr->e_curr[e][m];
1580 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1581 gain_max = FFMIN(100000.f, gain_max);
1582 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1583 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1584 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1585 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1587 sum[0] = sum[1] = 0.0f;
1588 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1589 sum[0] += sbr->e_origmapped[e][m];
1590 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1591 + sbr->s_m[e][m] * sbr->s_m[e][m]
1592 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1594 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1595 gain_boost = FFMIN(1.584893192f, gain_boost);
1596 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1597 sbr->gain[e][m] *= gain_boost;
1598 sbr->q_m[e][m] *= gain_boost;
1599 sbr->s_m[e][m] *= gain_boost;
1605 /// Assembling HF Signals (14496-3 sp04 p220)
1606 static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2],
1607 SpectralBandReplication *sbr, SBRData *ch_data,
1611 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1612 const int kx = sbr->kx[1];
1613 const int m_max = sbr->m[1];
1614 static const float h_smooth[5] = {
1621 static const int8_t phi[2][4] = {
1622 { 1, 0, -1, 0}, // real
1623 { 0, 1, 0, -1}, // imaginary
1625 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1626 int indexnoise = ch_data->f_indexnoise;
1627 int indexsine = ch_data->f_indexsine;
1628 memcpy(Y[0], Y[1], sizeof(Y[0]));
1631 for (i = 0; i < h_SL; i++) {
1632 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1633 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1636 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1637 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 for (e = 0; e < ch_data->bs_num_env; e++) {
1641 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1642 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1643 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1647 for (e = 0; e < ch_data->bs_num_env; e++) {
1648 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1649 int phi_sign = (1 - 2*(kx & 1));
1651 if (h_SL && e != e_a[0] && e != e_a[1]) {
1652 for (m = 0; m < m_max; m++) {
1653 const int idx1 = i + h_SL;
1654 float g_filt = 0.0f;
1655 for (j = 0; j <= h_SL; j++)
1656 g_filt += g_temp[idx1 - j][m] * h_smooth[j];
1657 Y[1][i][m + kx][0] =
1658 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1659 Y[1][i][m + kx][1] =
1660 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1663 for (m = 0; m < m_max; m++) {
1664 const float g_filt = g_temp[i + h_SL][m];
1665 Y[1][i][m + kx][0] =
1666 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1667 Y[1][i][m + kx][1] =
1668 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1672 if (e != e_a[0] && e != e_a[1]) {
1673 for (m = 0; m < m_max; m++) {
1674 indexnoise = (indexnoise + 1) & 0x1ff;
1675 if (sbr->s_m[e][m]) {
1676 Y[1][i][m + kx][0] +=
1677 sbr->s_m[e][m] * phi[0][indexsine];
1678 Y[1][i][m + kx][1] +=
1679 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1683 const int idx1 = i + h_SL;
1685 for (j = 0; j <= h_SL; j++)
1686 q_filt += q_temp[idx1 - j][m] * h_smooth[j];
1688 q_filt = q_temp[i][m];
1690 Y[1][i][m + kx][0] +=
1691 q_filt * sbr_noise_table[indexnoise][0];
1692 Y[1][i][m + kx][1] +=
1693 q_filt * sbr_noise_table[indexnoise][1];
1695 phi_sign = -phi_sign;
1698 indexnoise = (indexnoise + m_max) & 0x1ff;
1699 for (m = 0; m < m_max; m++) {
1700 Y[1][i][m + kx][0] +=
1701 sbr->s_m[e][m] * phi[0][indexsine];
1702 Y[1][i][m + kx][1] +=
1703 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1704 phi_sign = -phi_sign;
1707 indexsine = (indexsine + 1) & 3;
1710 ch_data->f_indexnoise = indexnoise;
1711 ch_data->f_indexsine = indexsine;
1714 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1717 int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
1719 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1722 sbr_dequant(sbr, id_aac);
1724 for (ch = 0; ch < nch; ch++) {
1725 /* decode channel */
1726 sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1727 (float*)sbr->qmf_filter_scratch,
1729 sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1731 sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1732 sbr_chirp(sbr, &sbr->data[ch]);
1733 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1734 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1735 sbr->data[ch].bs_num_env);
1738 sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1739 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1740 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1741 sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch],
1746 sbr_x_gen(sbr, sbr->X[ch], sbr->X_low, sbr->data[ch].Y, ch);
1749 if (ac->m4ac.ps == 1) {
1750 if (sbr->ps.start) {
1751 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1753 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1758 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, L, sbr->X[0], sbr->qmf_filter_scratch,
1759 sbr->data[0].synthesis_filterbank_samples,
1760 &sbr->data[0].synthesis_filterbank_samples_offset,
1763 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, R, sbr->X[1], sbr->qmf_filter_scratch,
1764 sbr->data[1].synthesis_filterbank_samples,
1765 &sbr->data[1].synthesis_filterbank_samples_offset,