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(SpectralBandReplication *sbr)
132 sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
133 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
134 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
135 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
136 ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64);
137 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0);
138 ff_ps_ctx_init(&sbr->ps);
141 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
143 ff_mdct_end(&sbr->mdct);
144 ff_mdct_end(&sbr->mdct_ana);
147 static int qsort_comparison_function_int16(const void *a, const void *b)
149 return *(const int16_t *)a - *(const int16_t *)b;
152 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
155 for (i = 0; i <= last_el; i++)
156 if (table[i] == needle)
161 /// Limiter Frequency Band Table (14496-3 sp04 p198)
162 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
165 if (sbr->bs_limiter_bands > 0) {
166 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
167 1.18509277094158210129f, //2^(0.49/2)
168 1.11987160404675912501f }; //2^(0.49/3)
169 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
170 int16_t patch_borders[7];
171 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
173 patch_borders[0] = sbr->kx[1];
174 for (k = 1; k <= sbr->num_patches; k++)
175 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
177 memcpy(sbr->f_tablelim, sbr->f_tablelow,
178 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
179 if (sbr->num_patches > 1)
180 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
181 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
183 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
184 sizeof(sbr->f_tablelim[0]),
185 qsort_comparison_function_int16);
187 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
188 while (out < sbr->f_tablelim + sbr->n_lim) {
189 if (*in >= *out * lim_bands_per_octave_warped) {
191 } else if (*in == *out ||
192 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
195 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
203 sbr->f_tablelim[0] = sbr->f_tablelow[0];
204 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
209 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
211 unsigned int cnt = get_bits_count(gb);
212 uint8_t bs_header_extra_1;
213 uint8_t bs_header_extra_2;
214 int old_bs_limiter_bands = sbr->bs_limiter_bands;
215 SpectrumParameters old_spectrum_params;
219 // Save last spectrum parameters variables to compare to new ones
220 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
222 sbr->bs_amp_res_header = get_bits1(gb);
223 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
224 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
225 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
226 skip_bits(gb, 2); // bs_reserved
228 bs_header_extra_1 = get_bits1(gb);
229 bs_header_extra_2 = get_bits1(gb);
231 if (bs_header_extra_1) {
232 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
233 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
234 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
236 sbr->spectrum_params.bs_freq_scale = 2;
237 sbr->spectrum_params.bs_alter_scale = 1;
238 sbr->spectrum_params.bs_noise_bands = 2;
241 // Check if spectrum parameters changed
242 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
245 if (bs_header_extra_2) {
246 sbr->bs_limiter_bands = get_bits(gb, 2);
247 sbr->bs_limiter_gains = get_bits(gb, 2);
248 sbr->bs_interpol_freq = get_bits1(gb);
249 sbr->bs_smoothing_mode = get_bits1(gb);
251 sbr->bs_limiter_bands = 2;
252 sbr->bs_limiter_gains = 2;
253 sbr->bs_interpol_freq = 1;
254 sbr->bs_smoothing_mode = 1;
257 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
258 sbr_make_f_tablelim(sbr);
260 return get_bits_count(gb) - cnt;
263 static int array_min_int16(const int16_t *array, int nel)
265 int i, min = array[0];
266 for (i = 1; i < nel; i++)
267 min = FFMIN(array[i], min);
271 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
273 int k, previous, present;
276 base = powf((float)stop / start, 1.0f / num_bands);
280 for (k = 0; k < num_bands-1; k++) {
282 present = lrintf(prod);
283 bands[k] = present - previous;
286 bands[num_bands-1] = stop - previous;
289 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
291 // Requirements (14496-3 sp04 p205)
293 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
296 if (bs_xover_band >= n_master) {
297 av_log(avctx, AV_LOG_ERROR,
298 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
305 /// Master Frequency Band Table (14496-3 sp04 p194)
306 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
307 SpectrumParameters *spectrum)
309 unsigned int temp, max_qmf_subbands;
310 unsigned int start_min, stop_min;
312 const int8_t *sbr_offset_ptr;
315 if (sbr->sample_rate < 32000) {
317 } else if (sbr->sample_rate < 64000) {
322 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
323 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
325 switch (sbr->sample_rate) {
327 sbr_offset_ptr = sbr_offset[0];
330 sbr_offset_ptr = sbr_offset[1];
333 sbr_offset_ptr = sbr_offset[2];
336 sbr_offset_ptr = sbr_offset[3];
338 case 44100: case 48000: case 64000:
339 sbr_offset_ptr = sbr_offset[4];
341 case 88200: case 96000: case 128000: case 176400: case 192000:
342 sbr_offset_ptr = sbr_offset[5];
345 av_log(ac->avctx, AV_LOG_ERROR,
346 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
350 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
352 if (spectrum->bs_stop_freq < 14) {
353 sbr->k[2] = stop_min;
354 make_bands(stop_dk, stop_min, 64, 13);
355 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
356 for (k = 0; k < spectrum->bs_stop_freq; k++)
357 sbr->k[2] += stop_dk[k];
358 } else if (spectrum->bs_stop_freq == 14) {
359 sbr->k[2] = 2*sbr->k[0];
360 } else if (spectrum->bs_stop_freq == 15) {
361 sbr->k[2] = 3*sbr->k[0];
363 av_log(ac->avctx, AV_LOG_ERROR,
364 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
367 sbr->k[2] = FFMIN(64, sbr->k[2]);
369 // Requirements (14496-3 sp04 p205)
370 if (sbr->sample_rate <= 32000) {
371 max_qmf_subbands = 48;
372 } else if (sbr->sample_rate == 44100) {
373 max_qmf_subbands = 35;
374 } else if (sbr->sample_rate >= 48000)
375 max_qmf_subbands = 32;
377 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
378 av_log(ac->avctx, AV_LOG_ERROR,
379 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
383 if (!spectrum->bs_freq_scale) {
386 dk = spectrum->bs_alter_scale + 1;
387 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
388 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
391 for (k = 1; k <= sbr->n_master; k++)
392 sbr->f_master[k] = dk;
394 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
397 sbr->f_master[2]-= (k2diff < -1);
399 sbr->f_master[sbr->n_master]++;
402 sbr->f_master[0] = sbr->k[0];
403 for (k = 1; k <= sbr->n_master; k++)
404 sbr->f_master[k] += sbr->f_master[k - 1];
407 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
408 int two_regions, num_bands_0;
409 int vdk0_max, vdk1_min;
412 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
414 sbr->k[1] = 2 * sbr->k[0];
417 sbr->k[1] = sbr->k[2];
420 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
422 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
423 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
429 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
431 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
432 vdk0_max = vk0[num_bands_0];
435 for (k = 1; k <= num_bands_0; k++) {
436 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
437 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
445 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
446 : 1.0f; // bs_alter_scale = {0,1}
447 int num_bands_1 = lrintf(half_bands * invwarp *
448 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
450 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
452 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
454 if (vdk1_min < vdk0_max) {
456 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
457 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
459 vk1[num_bands_1] -= change;
462 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
465 for (k = 1; k <= num_bands_1; k++) {
466 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
467 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
473 sbr->n_master = num_bands_0 + num_bands_1;
474 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
476 memcpy(&sbr->f_master[0], vk0,
477 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
478 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
479 num_bands_1 * sizeof(sbr->f_master[0]));
482 sbr->n_master = num_bands_0;
483 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
485 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
492 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
493 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
497 int usb = sbr->kx[1];
498 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
500 sbr->num_patches = 0;
502 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
503 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
509 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
510 sb = sbr->f_master[i];
511 odd = (sb + sbr->k[0]) & 1;
514 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
515 // After this check the final number of patches can still be six which is
516 // illegal however the Coding Technologies decoder check stream has a final
517 // count of 6 patches
518 if (sbr->num_patches > 5) {
519 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
523 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
524 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
526 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
533 if (sbr->f_master[k] - sb < 3)
535 } while (sb != sbr->kx[1] + sbr->m[1]);
537 if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
543 /// Derived Frequency Band Tables (14496-3 sp04 p197)
544 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
548 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
549 sbr->n[0] = (sbr->n[1] + 1) >> 1;
551 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
552 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
553 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
554 sbr->kx[1] = sbr->f_tablehigh[0];
556 // Requirements (14496-3 sp04 p205)
557 if (sbr->kx[1] + sbr->m[1] > 64) {
558 av_log(ac->avctx, AV_LOG_ERROR,
559 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
562 if (sbr->kx[1] > 32) {
563 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
567 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
568 temp = sbr->n[1] & 1;
569 for (k = 1; k <= sbr->n[0]; k++)
570 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
572 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
573 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
575 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
579 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
581 for (k = 1; k <= sbr->n_q; k++) {
582 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
583 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
586 if (sbr_hf_calc_npatches(ac, sbr) < 0)
589 sbr_make_f_tablelim(sbr);
591 sbr->data[0].f_indexnoise = 0;
592 sbr->data[1].f_indexnoise = 0;
597 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
601 for (i = 0; i < elements; i++) {
602 vec[i] = get_bits1(gb);
606 /** ceil(log2(index+1)) */
607 static const int8_t ceil_log2[] = {
611 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
612 GetBitContext *gb, SBRData *ch_data)
615 unsigned bs_pointer = 0;
616 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
617 int abs_bord_trail = 16;
618 int num_rel_lead, num_rel_trail;
619 unsigned bs_num_env_old = ch_data->bs_num_env;
621 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
622 ch_data->bs_amp_res = sbr->bs_amp_res_header;
623 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
625 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
627 ch_data->bs_num_env = 1 << get_bits(gb, 2);
628 num_rel_lead = ch_data->bs_num_env - 1;
629 if (ch_data->bs_num_env == 1)
630 ch_data->bs_amp_res = 0;
632 if (ch_data->bs_num_env > 4) {
633 av_log(ac->avctx, AV_LOG_ERROR,
634 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
635 ch_data->bs_num_env);
639 ch_data->t_env[0] = 0;
640 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
642 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
644 for (i = 0; i < num_rel_lead; i++)
645 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
647 ch_data->bs_freq_res[1] = get_bits1(gb);
648 for (i = 1; i < ch_data->bs_num_env; i++)
649 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
652 abs_bord_trail += get_bits(gb, 2);
653 num_rel_trail = get_bits(gb, 2);
654 ch_data->bs_num_env = num_rel_trail + 1;
655 ch_data->t_env[0] = 0;
656 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
658 for (i = 0; i < num_rel_trail; i++)
659 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
660 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
662 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
664 for (i = 0; i < ch_data->bs_num_env; i++)
665 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
668 ch_data->t_env[0] = get_bits(gb, 2);
669 num_rel_lead = get_bits(gb, 2);
670 ch_data->bs_num_env = num_rel_lead + 1;
671 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
673 for (i = 0; i < num_rel_lead; i++)
674 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
676 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
678 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
681 ch_data->t_env[0] = get_bits(gb, 2);
682 abs_bord_trail += get_bits(gb, 2);
683 num_rel_lead = get_bits(gb, 2);
684 num_rel_trail = get_bits(gb, 2);
685 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
687 if (ch_data->bs_num_env > 5) {
688 av_log(ac->avctx, AV_LOG_ERROR,
689 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
690 ch_data->bs_num_env);
694 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
696 for (i = 0; i < num_rel_lead; i++)
697 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
698 for (i = 0; i < num_rel_trail; i++)
699 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
700 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
702 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
704 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
708 if (bs_pointer > ch_data->bs_num_env + 1) {
709 av_log(ac->avctx, AV_LOG_ERROR,
710 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
715 for (i = 1; i <= ch_data->bs_num_env; i++) {
716 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
717 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
722 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
724 ch_data->t_q[0] = ch_data->t_env[0];
725 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
726 if (ch_data->bs_num_noise > 1) {
728 if (ch_data->bs_frame_class == FIXFIX) {
729 idx = ch_data->bs_num_env >> 1;
730 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
731 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
735 else if (bs_pointer == 1)
736 idx = ch_data->bs_num_env - 1;
737 else // bs_pointer > 1
738 idx = bs_pointer - 1;
740 ch_data->t_q[1] = ch_data->t_env[idx];
743 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
744 ch_data->e_a[1] = -1;
745 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
746 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
747 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
748 ch_data->e_a[1] = bs_pointer - 1;
753 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
754 //These variables are saved from the previous frame rather than copied
755 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
756 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
757 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
759 //These variables are read from the bitstream and therefore copied
760 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
761 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
762 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
763 dst->bs_num_env = src->bs_num_env;
764 dst->bs_amp_res = src->bs_amp_res;
765 dst->bs_num_noise = src->bs_num_noise;
766 dst->bs_frame_class = src->bs_frame_class;
767 dst->e_a[1] = src->e_a[1];
770 /// Read how the envelope and noise floor data is delta coded
771 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
774 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
775 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
778 /// Read inverse filtering data
779 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
784 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
785 for (i = 0; i < sbr->n_q; i++)
786 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
789 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
790 SBRData *ch_data, int ch)
794 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
796 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
797 const int odd = sbr->n[1] & 1;
799 if (sbr->bs_coupling && ch) {
800 if (ch_data->bs_amp_res) {
802 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
803 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
804 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
805 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
808 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
809 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
810 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
811 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
814 if (ch_data->bs_amp_res) {
816 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
817 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
818 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
819 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
822 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
823 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
824 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
825 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
829 for (i = 0; i < ch_data->bs_num_env; i++) {
830 if (ch_data->bs_df_env[i]) {
831 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
832 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
833 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
834 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
835 } else if (ch_data->bs_freq_res[i + 1]) {
836 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
837 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
838 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
841 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
842 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
843 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
847 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
848 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
849 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);
853 //assign 0th elements of env_facs from last elements
854 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
855 sizeof(ch_data->env_facs[0]));
858 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
859 SBRData *ch_data, int ch)
862 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
864 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
866 if (sbr->bs_coupling && ch) {
867 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
868 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
869 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
870 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
872 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
873 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
874 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
875 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
878 for (i = 0; i < ch_data->bs_num_noise; i++) {
879 if (ch_data->bs_df_noise[i]) {
880 for (j = 0; j < sbr->n_q; j++)
881 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
883 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
884 for (j = 1; j < sbr->n_q; j++)
885 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);
889 //assign 0th elements of noise_facs from last elements
890 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
891 sizeof(ch_data->noise_facs[0]));
894 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
896 int bs_extension_id, int *num_bits_left)
898 switch (bs_extension_id) {
899 case EXTENSION_ID_PS:
901 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
902 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
906 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
908 av_log_missing_feature(ac->avctx, "Parametric Stereo is", 0);
909 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
915 av_log_missing_feature(ac->avctx, "Reserved SBR extensions are", 1);
916 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
922 static int read_sbr_single_channel_element(AACContext *ac,
923 SpectralBandReplication *sbr,
926 if (get_bits1(gb)) // bs_data_extra
927 skip_bits(gb, 4); // bs_reserved
929 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
931 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
932 read_sbr_invf(sbr, gb, &sbr->data[0]);
933 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
934 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
936 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
937 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
942 static int read_sbr_channel_pair_element(AACContext *ac,
943 SpectralBandReplication *sbr,
946 if (get_bits1(gb)) // bs_data_extra
947 skip_bits(gb, 8); // bs_reserved
949 if ((sbr->bs_coupling = get_bits1(gb))) {
950 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
952 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
953 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
954 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
955 read_sbr_invf(sbr, gb, &sbr->data[0]);
956 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
957 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
958 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
959 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
960 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
961 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
963 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
964 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
966 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
967 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
968 read_sbr_invf(sbr, gb, &sbr->data[0]);
969 read_sbr_invf(sbr, gb, &sbr->data[1]);
970 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
971 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
972 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
973 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
976 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
977 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
978 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
979 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
984 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
985 GetBitContext *gb, int id_aac)
987 unsigned int cnt = get_bits_count(gb);
989 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
990 if (read_sbr_single_channel_element(ac, sbr, gb)) {
992 return get_bits_count(gb) - cnt;
994 } else if (id_aac == TYPE_CPE) {
995 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
997 return get_bits_count(gb) - cnt;
1000 av_log(ac->avctx, AV_LOG_ERROR,
1001 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1003 return get_bits_count(gb) - cnt;
1005 if (get_bits1(gb)) { // bs_extended_data
1006 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1007 if (num_bits_left == 15)
1008 num_bits_left += get_bits(gb, 8); // bs_esc_count
1010 num_bits_left <<= 3;
1011 while (num_bits_left > 7) {
1013 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1015 if (num_bits_left < 0) {
1016 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1018 if (num_bits_left > 0)
1019 skip_bits(gb, num_bits_left);
1022 return get_bits_count(gb) - cnt;
1025 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1028 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1030 err = sbr_make_f_derived(ac, sbr);
1032 av_log(ac->avctx, AV_LOG_ERROR,
1033 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1039 * Decode Spectral Band Replication extension data; reference: table 4.55.
1041 * @param crc flag indicating the presence of CRC checksum
1042 * @param cnt length of TYPE_FIL syntactic element in bytes
1044 * @return Returns number of bytes consumed from the TYPE_FIL element.
1046 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1047 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1049 unsigned int num_sbr_bits = 0, num_align_bits;
1050 unsigned bytes_read;
1051 GetBitContext gbc = *gb_host, *gb = &gbc;
1052 skip_bits_long(gb_host, cnt*8 - 4);
1056 if (!sbr->sample_rate)
1057 sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1058 if (!ac->m4ac.ext_sample_rate)
1059 ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
1062 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1066 //Save some state from the previous frame.
1067 sbr->kx[0] = sbr->kx[1];
1068 sbr->m[0] = sbr->m[1];
1071 if (get_bits1(gb)) // bs_header_flag
1072 num_sbr_bits += read_sbr_header(sbr, gb);
1078 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1080 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1081 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1083 if (bytes_read > cnt) {
1084 av_log(ac->avctx, AV_LOG_ERROR,
1085 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1090 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1091 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1096 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1097 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1098 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1099 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1100 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1101 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1102 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1103 float fac = temp1 / (1.0f + temp2);
1104 sbr->data[0].env_facs[e][k] = fac;
1105 sbr->data[1].env_facs[e][k] = fac * temp2;
1108 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1109 for (k = 0; k < sbr->n_q; k++) {
1110 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1111 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1112 float fac = temp1 / (1.0f + temp2);
1113 sbr->data[0].noise_facs[e][k] = fac;
1114 sbr->data[1].noise_facs[e][k] = fac * temp2;
1117 } else { // SCE or one non-coupled CPE
1118 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1119 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1120 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1121 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1122 sbr->data[ch].env_facs[e][k] =
1123 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1124 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1125 for (k = 0; k < sbr->n_q; k++)
1126 sbr->data[ch].noise_facs[e][k] =
1127 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1133 * Analysis QMF Bank (14496-3 sp04 p206)
1135 * @param x pointer to the beginning of the first sample window
1136 * @param W array of complex-valued samples split into subbands
1138 static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct, const float *in, float *x,
1139 float z[320], float W[2][32][32][2])
1142 memcpy(W[0], W[1], sizeof(W[0]));
1143 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1144 memcpy(x+288, in, 1024*sizeof(x[0]));
1145 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1146 // are not supported
1147 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1148 for (k = 0; k < 64; k++) {
1149 float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
1154 for (k = 1; k < 32; k++) {
1155 z[64+2*k-1] = z[ k];
1156 z[64+2*k ] = -z[64-k];
1160 mdct->imdct_half(mdct, z, z+64);
1161 for (k = 0; k < 32; k++) {
1162 W[1][i][k][0] = -z[63-k];
1163 W[1][i][k][1] = z[k];
1170 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1171 * (14496-3 sp04 p206)
1173 static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1174 float *out, float X[2][38][64],
1175 float mdct_buf[2][64],
1176 float *v0, int *v_off, const unsigned int div)
1179 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1181 for (i = 0; i < 32; i++) {
1183 int saved_samples = (1280 - 128) >> div;
1184 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1185 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
1187 *v_off -= 128 >> div;
1191 for (n = 0; n < 32; n++) {
1192 X[0][i][ n] = -X[0][i][n];
1193 X[0][i][32+n] = X[1][i][31-n];
1195 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1196 for (n = 0; n < 32; n++) {
1197 v[ n] = mdct_buf[0][63 - 2*n];
1198 v[63 - n] = -mdct_buf[0][62 - 2*n];
1201 for (n = 1; n < 64; n+=2) {
1202 X[1][i][n] = -X[1][i][n];
1204 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1205 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1206 for (n = 0; n < 64; n++) {
1207 v[ n] = -mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1208 v[127 - n] = mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1211 dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1212 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1213 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1214 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1215 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1216 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1217 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1218 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1219 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1220 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1225 static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
1228 float real_sum = 0.0f;
1229 float imag_sum = 0.0f;
1231 for (i = 1; i < 38; i++) {
1232 real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
1233 imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
1235 phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
1236 phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
1238 phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
1239 phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
1242 for (i = 1; i < 38; i++) {
1243 real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
1245 phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
1246 phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
1250 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1251 * (14496-3 sp04 p214)
1252 * Warning: This routine does not seem numerically stable.
1254 static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2],
1255 const float X_low[32][40][2], int k0)
1258 for (k = 0; k < k0; k++) {
1259 float phi[3][2][2], dk;
1261 autocorrelate(X_low[k], phi, 0);
1262 autocorrelate(X_low[k], phi, 1);
1263 autocorrelate(X_low[k], phi, 2);
1265 dk = phi[2][1][0] * phi[1][0][0] -
1266 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1272 float temp_real, temp_im;
1273 temp_real = phi[0][0][0] * phi[1][1][0] -
1274 phi[0][0][1] * phi[1][1][1] -
1275 phi[0][1][0] * phi[1][0][0];
1276 temp_im = phi[0][0][0] * phi[1][1][1] +
1277 phi[0][0][1] * phi[1][1][0] -
1278 phi[0][1][1] * phi[1][0][0];
1280 alpha1[k][0] = temp_real / dk;
1281 alpha1[k][1] = temp_im / dk;
1284 if (!phi[1][0][0]) {
1288 float temp_real, temp_im;
1289 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1290 alpha1[k][1] * phi[1][1][1];
1291 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1292 alpha1[k][0] * phi[1][1][1];
1294 alpha0[k][0] = -temp_real / phi[1][0][0];
1295 alpha0[k][1] = -temp_im / phi[1][0][0];
1298 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1299 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1308 /// Chirp Factors (14496-3 sp04 p214)
1309 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1313 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1315 for (i = 0; i < sbr->n_q; i++) {
1316 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1319 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1321 if (new_bw < ch_data->bw_array[i]) {
1322 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1324 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1325 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1329 /// Generate the subband filtered lowband
1330 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1331 float X_low[32][40][2], const float W[2][32][32][2])
1334 const int t_HFGen = 8;
1336 memset(X_low, 0, 32*sizeof(*X_low));
1337 for (k = 0; k < sbr->kx[1]; k++) {
1338 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1339 X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1340 X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1343 for (k = 0; k < sbr->kx[0]; k++) {
1344 for (i = 0; i < t_HFGen; i++) {
1345 X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1346 X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1352 /// High Frequency Generator (14496-3 sp04 p215)
1353 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1354 float X_high[64][40][2], const float X_low[32][40][2],
1355 const float (*alpha0)[2], const float (*alpha1)[2],
1356 const float bw_array[5], const uint8_t *t_env,
1362 for (j = 0; j < sbr->num_patches; j++) {
1363 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1365 const int p = sbr->patch_start_subband[j] + x;
1366 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1371 av_log(ac->avctx, AV_LOG_ERROR,
1372 "ERROR : no subband found for frequency %d\n", k);
1376 alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g];
1377 alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g];
1378 alpha[2] = alpha0[p][0] * bw_array[g];
1379 alpha[3] = alpha0[p][1] * bw_array[g];
1381 for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) {
1382 const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET;
1384 X_low[p][idx - 2][0] * alpha[0] -
1385 X_low[p][idx - 2][1] * alpha[1] +
1386 X_low[p][idx - 1][0] * alpha[2] -
1387 X_low[p][idx - 1][1] * alpha[3] +
1390 X_low[p][idx - 2][1] * alpha[0] +
1391 X_low[p][idx - 2][0] * alpha[1] +
1392 X_low[p][idx - 1][1] * alpha[2] +
1393 X_low[p][idx - 1][0] * alpha[3] +
1398 if (k < sbr->m[1] + sbr->kx[1])
1399 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1404 /// Generate the subband filtered lowband
1405 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1406 const float X_low[32][40][2], const float Y[2][38][64][2],
1411 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1412 memset(X, 0, 2*sizeof(*X));
1413 for (k = 0; k < sbr->kx[0]; k++) {
1414 for (i = 0; i < i_Temp; i++) {
1415 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1416 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1419 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1420 for (i = 0; i < i_Temp; i++) {
1421 X[0][i][k] = Y[0][i + i_f][k][0];
1422 X[1][i][k] = Y[0][i + i_f][k][1];
1426 for (k = 0; k < sbr->kx[1]; k++) {
1427 for (i = i_Temp; i < 38; i++) {
1428 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1429 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1432 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1433 for (i = i_Temp; i < i_f; i++) {
1434 X[0][i][k] = Y[1][i][k][0];
1435 X[1][i][k] = Y[1][i][k][1];
1441 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1442 * (14496-3 sp04 p217)
1444 static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1445 SBRData *ch_data, int e_a[2])
1449 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1450 for (e = 0; e < ch_data->bs_num_env; e++) {
1451 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1452 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1455 for (i = 0; i < ilim; i++)
1456 for (m = table[i]; m < table[i + 1]; m++)
1457 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1459 // ch_data->bs_num_noise > 1 => 2 noise floors
1460 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1461 for (i = 0; i < sbr->n_q; i++)
1462 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1463 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1465 for (i = 0; i < sbr->n[1]; i++) {
1466 if (ch_data->bs_add_harmonic_flag) {
1467 const unsigned int m_midpoint =
1468 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1470 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1471 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1475 for (i = 0; i < ilim; i++) {
1476 int additional_sinusoid_present = 0;
1477 for (m = table[i]; m < table[i + 1]; m++) {
1478 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1479 additional_sinusoid_present = 1;
1483 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1484 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1488 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1491 /// Estimation of current envelope (14496-3 sp04 p218)
1492 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1493 SpectralBandReplication *sbr, SBRData *ch_data)
1497 if (sbr->bs_interpol_freq) {
1498 for (e = 0; e < ch_data->bs_num_env; e++) {
1499 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1500 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1501 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1503 for (m = 0; m < sbr->m[1]; m++) {
1506 for (i = ilb; i < iub; i++) {
1507 sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] +
1508 X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1];
1510 e_curr[e][m] = sum * recip_env_size;
1516 for (e = 0; e < ch_data->bs_num_env; e++) {
1517 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1518 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1519 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1520 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1522 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1524 const int den = env_size * (table[p + 1] - table[p]);
1526 for (k = table[p]; k < table[p + 1]; k++) {
1527 for (i = ilb; i < iub; i++) {
1528 sum += X_high[k][i][0] * X_high[k][i][0] +
1529 X_high[k][i][1] * X_high[k][i][1];
1533 for (k = table[p]; k < table[p + 1]; k++) {
1534 e_curr[e][k - sbr->kx[1]] = sum;
1542 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1543 * and Calculation of gain (14496-3 sp04 p219)
1545 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1546 SBRData *ch_data, const int e_a[2])
1549 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1550 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1552 for (e = 0; e < ch_data->bs_num_env; e++) {
1553 int delta = !((e == e_a[1]) || (e == e_a[0]));
1554 for (k = 0; k < sbr->n_lim; k++) {
1555 float gain_boost, gain_max;
1556 float sum[2] = { 0.0f, 0.0f };
1557 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1558 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1559 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1560 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1561 if (!sbr->s_mapped[e][m]) {
1562 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1563 ((1.0f + sbr->e_curr[e][m]) *
1564 (1.0f + sbr->q_mapped[e][m] * delta)));
1566 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1567 ((1.0f + sbr->e_curr[e][m]) *
1568 (1.0f + sbr->q_mapped[e][m])));
1571 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1572 sum[0] += sbr->e_origmapped[e][m];
1573 sum[1] += sbr->e_curr[e][m];
1575 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1576 gain_max = FFMIN(100000.f, gain_max);
1577 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1578 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1579 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1580 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1582 sum[0] = sum[1] = 0.0f;
1583 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1584 sum[0] += sbr->e_origmapped[e][m];
1585 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1586 + sbr->s_m[e][m] * sbr->s_m[e][m]
1587 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1589 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1590 gain_boost = FFMIN(1.584893192f, gain_boost);
1591 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1592 sbr->gain[e][m] *= gain_boost;
1593 sbr->q_m[e][m] *= gain_boost;
1594 sbr->s_m[e][m] *= gain_boost;
1600 /// Assembling HF Signals (14496-3 sp04 p220)
1601 static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2],
1602 SpectralBandReplication *sbr, SBRData *ch_data,
1606 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1607 const int kx = sbr->kx[1];
1608 const int m_max = sbr->m[1];
1609 static const float h_smooth[5] = {
1616 static const int8_t phi[2][4] = {
1617 { 1, 0, -1, 0}, // real
1618 { 0, 1, 0, -1}, // imaginary
1620 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1621 int indexnoise = ch_data->f_indexnoise;
1622 int indexsine = ch_data->f_indexsine;
1623 memcpy(Y[0], Y[1], sizeof(Y[0]));
1626 for (i = 0; i < h_SL; i++) {
1627 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1628 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1631 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1632 memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1635 for (e = 0; e < ch_data->bs_num_env; e++) {
1636 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1637 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1638 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1642 for (e = 0; e < ch_data->bs_num_env; e++) {
1643 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1644 int phi_sign = (1 - 2*(kx & 1));
1646 if (h_SL && e != e_a[0] && e != e_a[1]) {
1647 for (m = 0; m < m_max; m++) {
1648 const int idx1 = i + h_SL;
1649 float g_filt = 0.0f;
1650 for (j = 0; j <= h_SL; j++)
1651 g_filt += g_temp[idx1 - j][m] * h_smooth[j];
1652 Y[1][i][m + kx][0] =
1653 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1654 Y[1][i][m + kx][1] =
1655 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1658 for (m = 0; m < m_max; m++) {
1659 const float g_filt = g_temp[i + h_SL][m];
1660 Y[1][i][m + kx][0] =
1661 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1662 Y[1][i][m + kx][1] =
1663 X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1667 if (e != e_a[0] && e != e_a[1]) {
1668 for (m = 0; m < m_max; m++) {
1669 indexnoise = (indexnoise + 1) & 0x1ff;
1670 if (sbr->s_m[e][m]) {
1671 Y[1][i][m + kx][0] +=
1672 sbr->s_m[e][m] * phi[0][indexsine];
1673 Y[1][i][m + kx][1] +=
1674 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1678 const int idx1 = i + h_SL;
1680 for (j = 0; j <= h_SL; j++)
1681 q_filt += q_temp[idx1 - j][m] * h_smooth[j];
1683 q_filt = q_temp[i][m];
1685 Y[1][i][m + kx][0] +=
1686 q_filt * sbr_noise_table[indexnoise][0];
1687 Y[1][i][m + kx][1] +=
1688 q_filt * sbr_noise_table[indexnoise][1];
1690 phi_sign = -phi_sign;
1693 indexnoise = (indexnoise + m_max) & 0x1ff;
1694 for (m = 0; m < m_max; m++) {
1695 Y[1][i][m + kx][0] +=
1696 sbr->s_m[e][m] * phi[0][indexsine];
1697 Y[1][i][m + kx][1] +=
1698 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1699 phi_sign = -phi_sign;
1702 indexsine = (indexsine + 1) & 3;
1705 ch_data->f_indexnoise = indexnoise;
1706 ch_data->f_indexsine = indexsine;
1709 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1712 int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
1714 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1717 sbr_dequant(sbr, id_aac);
1719 for (ch = 0; ch < nch; ch++) {
1720 /* decode channel */
1721 sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1722 (float*)sbr->qmf_filter_scratch,
1724 sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1726 sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1727 sbr_chirp(sbr, &sbr->data[ch]);
1728 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1729 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1730 sbr->data[ch].bs_num_env);
1733 sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1734 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1735 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1736 sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch],
1741 sbr_x_gen(sbr, sbr->X[ch], sbr->X_low, sbr->data[ch].Y, ch);
1744 if (ac->m4ac.ps == 1) {
1745 if (sbr->ps.start) {
1746 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1748 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1753 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, L, sbr->X[0], sbr->qmf_filter_scratch,
1754 sbr->data[0].synthesis_filterbank_samples,
1755 &sbr->data[0].synthesis_filterbank_samples_offset,
1758 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, R, sbr->X[1], sbr->qmf_filter_scratch,
1759 sbr->data[1].synthesis_filterbank_samples,
1760 &sbr->data[1].synthesis_filterbank_samples_offset,