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"
33 #include "aacsbr_tablegen.h"
37 #include "libavutil/internal.h"
38 #include "libavutil/libm.h"
39 #include "libavutil/avassert.h"
45 #define ENVELOPE_ADJUSTMENT_OFFSET 2
46 #define NOISE_FLOOR_OFFSET 6.0f
49 #include "mips/aacsbr_mips.h"
50 #endif /* ARCH_MIPS */
58 T_HUFFMAN_ENV_BAL_1_5DB,
59 F_HUFFMAN_ENV_BAL_1_5DB,
62 T_HUFFMAN_ENV_BAL_3_0DB,
63 F_HUFFMAN_ENV_BAL_3_0DB,
64 T_HUFFMAN_NOISE_3_0DB,
65 T_HUFFMAN_NOISE_BAL_3_0DB,
69 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
82 static VLC vlc_sbr[10];
83 static const int8_t vlc_sbr_lav[10] =
84 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
86 #define SBR_INIT_VLC_STATIC(num, size) \
87 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
88 sbr_tmp[num].sbr_bits , 1, 1, \
89 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
92 #define SBR_VLC_ROW(name) \
93 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
95 static void aacsbr_func_ptr_init(AACSBRContext *c);
97 av_cold void ff_aac_sbr_init(void)
100 const void *sbr_codes, *sbr_bits;
101 const unsigned int table_size, elem_size;
103 SBR_VLC_ROW(t_huffman_env_1_5dB),
104 SBR_VLC_ROW(f_huffman_env_1_5dB),
105 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
106 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
107 SBR_VLC_ROW(t_huffman_env_3_0dB),
108 SBR_VLC_ROW(f_huffman_env_3_0dB),
109 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
110 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
111 SBR_VLC_ROW(t_huffman_noise_3_0dB),
112 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
115 // SBR VLC table initialization
116 SBR_INIT_VLC_STATIC(0, 1098);
117 SBR_INIT_VLC_STATIC(1, 1092);
118 SBR_INIT_VLC_STATIC(2, 768);
119 SBR_INIT_VLC_STATIC(3, 1026);
120 SBR_INIT_VLC_STATIC(4, 1058);
121 SBR_INIT_VLC_STATIC(5, 1052);
122 SBR_INIT_VLC_STATIC(6, 544);
123 SBR_INIT_VLC_STATIC(7, 544);
124 SBR_INIT_VLC_STATIC(8, 592);
125 SBR_INIT_VLC_STATIC(9, 512);
132 /** Places SBR in pure upsampling mode. */
133 static void sbr_turnoff(SpectralBandReplication *sbr) {
135 // Init defults used in pure upsampling mode
136 sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
138 // Reset values for first SBR header
139 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
140 memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
143 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
145 if(sbr->mdct.mdct_bits)
147 sbr->kx[0] = sbr->kx[1];
149 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
150 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
151 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
152 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
153 * and scale back down at synthesis. */
154 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));
155 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
156 ff_ps_ctx_init(&sbr->ps);
157 ff_sbrdsp_init(&sbr->dsp);
158 aacsbr_func_ptr_init(&sbr->c);
161 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
163 ff_mdct_end(&sbr->mdct);
164 ff_mdct_end(&sbr->mdct_ana);
167 static int qsort_comparison_function_int16(const void *a, const void *b)
169 return *(const int16_t *)a - *(const int16_t *)b;
172 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
175 for (i = 0; i <= last_el; i++)
176 if (table[i] == needle)
181 /// Limiter Frequency Band Table (14496-3 sp04 p198)
182 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
185 if (sbr->bs_limiter_bands > 0) {
186 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
187 1.18509277094158210129f, //2^(0.49/2)
188 1.11987160404675912501f }; //2^(0.49/3)
189 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
190 int16_t patch_borders[7];
191 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
193 patch_borders[0] = sbr->kx[1];
194 for (k = 1; k <= sbr->num_patches; k++)
195 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
197 memcpy(sbr->f_tablelim, sbr->f_tablelow,
198 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
199 if (sbr->num_patches > 1)
200 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
201 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
203 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
204 sizeof(sbr->f_tablelim[0]),
205 qsort_comparison_function_int16);
207 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
208 while (out < sbr->f_tablelim + sbr->n_lim) {
209 if (*in >= *out * lim_bands_per_octave_warped) {
211 } else if (*in == *out ||
212 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
215 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
223 sbr->f_tablelim[0] = sbr->f_tablelow[0];
224 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
229 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
231 unsigned int cnt = get_bits_count(gb);
232 uint8_t bs_header_extra_1;
233 uint8_t bs_header_extra_2;
234 int old_bs_limiter_bands = sbr->bs_limiter_bands;
235 SpectrumParameters old_spectrum_params;
239 // Save last spectrum parameters variables to compare to new ones
240 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
242 sbr->bs_amp_res_header = get_bits1(gb);
243 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
244 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
245 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
246 skip_bits(gb, 2); // bs_reserved
248 bs_header_extra_1 = get_bits1(gb);
249 bs_header_extra_2 = get_bits1(gb);
251 if (bs_header_extra_1) {
252 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
253 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
254 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
256 sbr->spectrum_params.bs_freq_scale = 2;
257 sbr->spectrum_params.bs_alter_scale = 1;
258 sbr->spectrum_params.bs_noise_bands = 2;
261 // Check if spectrum parameters changed
262 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
265 if (bs_header_extra_2) {
266 sbr->bs_limiter_bands = get_bits(gb, 2);
267 sbr->bs_limiter_gains = get_bits(gb, 2);
268 sbr->bs_interpol_freq = get_bits1(gb);
269 sbr->bs_smoothing_mode = get_bits1(gb);
271 sbr->bs_limiter_bands = 2;
272 sbr->bs_limiter_gains = 2;
273 sbr->bs_interpol_freq = 1;
274 sbr->bs_smoothing_mode = 1;
277 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
278 sbr_make_f_tablelim(sbr);
280 return get_bits_count(gb) - cnt;
283 static int array_min_int16(const int16_t *array, int nel)
285 int i, min = array[0];
286 for (i = 1; i < nel; i++)
287 min = FFMIN(array[i], min);
291 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
293 int k, previous, present;
296 base = powf((float)stop / start, 1.0f / num_bands);
300 for (k = 0; k < num_bands-1; k++) {
302 present = lrintf(prod);
303 bands[k] = present - previous;
306 bands[num_bands-1] = stop - previous;
309 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
311 // Requirements (14496-3 sp04 p205)
313 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
316 if (bs_xover_band >= n_master) {
317 av_log(avctx, AV_LOG_ERROR,
318 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
325 /// Master Frequency Band Table (14496-3 sp04 p194)
326 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
327 SpectrumParameters *spectrum)
329 unsigned int temp, max_qmf_subbands = 0;
330 unsigned int start_min, stop_min;
332 const int8_t *sbr_offset_ptr;
335 if (sbr->sample_rate < 32000) {
337 } else if (sbr->sample_rate < 64000) {
342 switch (sbr->sample_rate) {
344 sbr_offset_ptr = sbr_offset[0];
347 sbr_offset_ptr = sbr_offset[1];
350 sbr_offset_ptr = sbr_offset[2];
353 sbr_offset_ptr = sbr_offset[3];
355 case 44100: case 48000: case 64000:
356 sbr_offset_ptr = sbr_offset[4];
358 case 88200: case 96000: case 128000: case 176400: case 192000:
359 sbr_offset_ptr = sbr_offset[5];
362 av_log(ac->avctx, AV_LOG_ERROR,
363 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
367 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
368 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
370 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
372 if (spectrum->bs_stop_freq < 14) {
373 sbr->k[2] = stop_min;
374 make_bands(stop_dk, stop_min, 64, 13);
375 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
376 for (k = 0; k < spectrum->bs_stop_freq; k++)
377 sbr->k[2] += stop_dk[k];
378 } else if (spectrum->bs_stop_freq == 14) {
379 sbr->k[2] = 2*sbr->k[0];
380 } else if (spectrum->bs_stop_freq == 15) {
381 sbr->k[2] = 3*sbr->k[0];
383 av_log(ac->avctx, AV_LOG_ERROR,
384 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
387 sbr->k[2] = FFMIN(64, sbr->k[2]);
389 // Requirements (14496-3 sp04 p205)
390 if (sbr->sample_rate <= 32000) {
391 max_qmf_subbands = 48;
392 } else if (sbr->sample_rate == 44100) {
393 max_qmf_subbands = 35;
394 } else if (sbr->sample_rate >= 48000)
395 max_qmf_subbands = 32;
399 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
400 av_log(ac->avctx, AV_LOG_ERROR,
401 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
405 if (!spectrum->bs_freq_scale) {
408 dk = spectrum->bs_alter_scale + 1;
409 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
410 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
413 for (k = 1; k <= sbr->n_master; k++)
414 sbr->f_master[k] = dk;
416 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
419 sbr->f_master[2]-= (k2diff < -1);
421 sbr->f_master[sbr->n_master]++;
424 sbr->f_master[0] = sbr->k[0];
425 for (k = 1; k <= sbr->n_master; k++)
426 sbr->f_master[k] += sbr->f_master[k - 1];
429 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
430 int two_regions, num_bands_0;
431 int vdk0_max, vdk1_min;
434 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
436 sbr->k[1] = 2 * sbr->k[0];
439 sbr->k[1] = sbr->k[2];
442 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
444 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
445 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
451 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
453 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
454 vdk0_max = vk0[num_bands_0];
457 for (k = 1; k <= num_bands_0; k++) {
458 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
459 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
467 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
468 : 1.0f; // bs_alter_scale = {0,1}
469 int num_bands_1 = lrintf(half_bands * invwarp *
470 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
472 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
474 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
476 if (vdk1_min < vdk0_max) {
478 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
479 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
481 vk1[num_bands_1] -= change;
484 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
487 for (k = 1; k <= num_bands_1; k++) {
488 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
489 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
495 sbr->n_master = num_bands_0 + num_bands_1;
496 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
498 memcpy(&sbr->f_master[0], vk0,
499 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
500 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
501 num_bands_1 * sizeof(sbr->f_master[0]));
504 sbr->n_master = num_bands_0;
505 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
507 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
514 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
515 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
519 int usb = sbr->kx[1];
520 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
522 sbr->num_patches = 0;
524 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
525 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
531 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
532 sb = sbr->f_master[i];
533 odd = (sb + sbr->k[0]) & 1;
536 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
537 // After this check the final number of patches can still be six which is
538 // illegal however the Coding Technologies decoder check stream has a final
539 // count of 6 patches
540 if (sbr->num_patches > 5) {
541 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
545 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
546 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
548 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
555 if (sbr->f_master[k] - sb < 3)
557 } while (sb != sbr->kx[1] + sbr->m[1]);
559 if (sbr->num_patches > 1 &&
560 sbr->patch_num_subbands[sbr->num_patches - 1] < 3)
566 /// Derived Frequency Band Tables (14496-3 sp04 p197)
567 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
571 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
572 sbr->n[0] = (sbr->n[1] + 1) >> 1;
574 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
575 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
576 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
577 sbr->kx[1] = sbr->f_tablehigh[0];
579 // Requirements (14496-3 sp04 p205)
580 if (sbr->kx[1] + sbr->m[1] > 64) {
581 av_log(ac->avctx, AV_LOG_ERROR,
582 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
585 if (sbr->kx[1] > 32) {
586 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
590 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
591 temp = sbr->n[1] & 1;
592 for (k = 1; k <= sbr->n[0]; k++)
593 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
595 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
596 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
598 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
602 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
604 for (k = 1; k <= sbr->n_q; k++) {
605 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
606 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
609 if (sbr_hf_calc_npatches(ac, sbr) < 0)
612 sbr_make_f_tablelim(sbr);
614 sbr->data[0].f_indexnoise = 0;
615 sbr->data[1].f_indexnoise = 0;
620 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
624 for (i = 0; i < elements; i++) {
625 vec[i] = get_bits1(gb);
629 /** ceil(log2(index+1)) */
630 static const int8_t ceil_log2[] = {
634 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
635 GetBitContext *gb, SBRData *ch_data)
639 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
640 int abs_bord_trail = 16;
641 int num_rel_lead, num_rel_trail;
642 unsigned bs_num_env_old = ch_data->bs_num_env;
644 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
645 ch_data->bs_amp_res = sbr->bs_amp_res_header;
646 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
648 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
650 ch_data->bs_num_env = 1 << get_bits(gb, 2);
651 num_rel_lead = ch_data->bs_num_env - 1;
652 if (ch_data->bs_num_env == 1)
653 ch_data->bs_amp_res = 0;
655 if (ch_data->bs_num_env > 4) {
656 av_log(ac->avctx, AV_LOG_ERROR,
657 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
658 ch_data->bs_num_env);
662 ch_data->t_env[0] = 0;
663 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
665 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
667 for (i = 0; i < num_rel_lead; i++)
668 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
670 ch_data->bs_freq_res[1] = get_bits1(gb);
671 for (i = 1; i < ch_data->bs_num_env; i++)
672 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
675 abs_bord_trail += get_bits(gb, 2);
676 num_rel_trail = get_bits(gb, 2);
677 ch_data->bs_num_env = num_rel_trail + 1;
678 ch_data->t_env[0] = 0;
679 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
681 for (i = 0; i < num_rel_trail; i++)
682 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
683 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
685 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
687 for (i = 0; i < ch_data->bs_num_env; i++)
688 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
691 ch_data->t_env[0] = get_bits(gb, 2);
692 num_rel_lead = get_bits(gb, 2);
693 ch_data->bs_num_env = num_rel_lead + 1;
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;
699 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
701 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
704 ch_data->t_env[0] = get_bits(gb, 2);
705 abs_bord_trail += get_bits(gb, 2);
706 num_rel_lead = get_bits(gb, 2);
707 num_rel_trail = get_bits(gb, 2);
708 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
710 if (ch_data->bs_num_env > 5) {
711 av_log(ac->avctx, AV_LOG_ERROR,
712 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
713 ch_data->bs_num_env);
717 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
719 for (i = 0; i < num_rel_lead; i++)
720 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
721 for (i = 0; i < num_rel_trail; i++)
722 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
723 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
725 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
727 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
731 av_assert0(bs_pointer >= 0);
732 if (bs_pointer > ch_data->bs_num_env + 1) {
733 av_log(ac->avctx, AV_LOG_ERROR,
734 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
739 for (i = 1; i <= ch_data->bs_num_env; i++) {
740 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
741 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
746 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
748 ch_data->t_q[0] = ch_data->t_env[0];
749 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
750 if (ch_data->bs_num_noise > 1) {
752 if (ch_data->bs_frame_class == FIXFIX) {
753 idx = ch_data->bs_num_env >> 1;
754 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
755 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
759 else if (bs_pointer == 1)
760 idx = ch_data->bs_num_env - 1;
761 else // bs_pointer > 1
762 idx = bs_pointer - 1;
764 ch_data->t_q[1] = ch_data->t_env[idx];
767 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
768 ch_data->e_a[1] = -1;
769 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
770 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
771 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
772 ch_data->e_a[1] = bs_pointer - 1;
777 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
778 //These variables are saved from the previous frame rather than copied
779 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
780 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
781 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
783 //These variables are read from the bitstream and therefore copied
784 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
785 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
786 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
787 dst->bs_num_env = src->bs_num_env;
788 dst->bs_amp_res = src->bs_amp_res;
789 dst->bs_num_noise = src->bs_num_noise;
790 dst->bs_frame_class = src->bs_frame_class;
791 dst->e_a[1] = src->e_a[1];
794 /// Read how the envelope and noise floor data is delta coded
795 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
798 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
799 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
802 /// Read inverse filtering data
803 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
808 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
809 for (i = 0; i < sbr->n_q; i++)
810 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
813 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
814 SBRData *ch_data, int ch)
818 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
820 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
821 const int odd = sbr->n[1] & 1;
823 if (sbr->bs_coupling && ch) {
824 if (ch_data->bs_amp_res) {
826 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
827 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
828 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
829 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
832 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
833 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
834 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
835 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
838 if (ch_data->bs_amp_res) {
840 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
841 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
842 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
843 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
846 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
847 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
848 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
849 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
853 for (i = 0; i < ch_data->bs_num_env; i++) {
854 if (ch_data->bs_df_env[i]) {
855 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
856 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
857 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
858 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
859 } else if (ch_data->bs_freq_res[i + 1]) {
860 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
861 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
862 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
865 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
866 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
867 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
871 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
872 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
873 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);
877 //assign 0th elements of env_facs from last elements
878 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
879 sizeof(ch_data->env_facs[0]));
882 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
883 SBRData *ch_data, int ch)
886 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
888 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
890 if (sbr->bs_coupling && ch) {
891 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
892 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
893 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
894 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
896 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
897 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
898 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
899 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
902 for (i = 0; i < ch_data->bs_num_noise; i++) {
903 if (ch_data->bs_df_noise[i]) {
904 for (j = 0; j < sbr->n_q; j++)
905 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
907 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
908 for (j = 1; j < sbr->n_q; j++)
909 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);
913 //assign 0th elements of noise_facs from last elements
914 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
915 sizeof(ch_data->noise_facs[0]));
918 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
920 int bs_extension_id, int *num_bits_left)
922 switch (bs_extension_id) {
923 case EXTENSION_ID_PS:
924 if (!ac->oc[1].m4ac.ps) {
925 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
926 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
930 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
931 ac->avctx->profile = FF_PROFILE_AAC_HE_V2;
933 avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");
934 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
940 // some files contain 0-padding
941 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
942 avpriv_request_sample(ac->avctx, "Reserved SBR extensions");
943 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
949 static int read_sbr_single_channel_element(AACContext *ac,
950 SpectralBandReplication *sbr,
953 if (get_bits1(gb)) // bs_data_extra
954 skip_bits(gb, 4); // bs_reserved
956 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
958 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
959 read_sbr_invf(sbr, gb, &sbr->data[0]);
960 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
961 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
963 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
964 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
969 static int read_sbr_channel_pair_element(AACContext *ac,
970 SpectralBandReplication *sbr,
973 if (get_bits1(gb)) // bs_data_extra
974 skip_bits(gb, 8); // bs_reserved
976 if ((sbr->bs_coupling = get_bits1(gb))) {
977 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
979 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
980 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
981 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
982 read_sbr_invf(sbr, gb, &sbr->data[0]);
983 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
984 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
985 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
986 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
987 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
988 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
990 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
991 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
993 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
994 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
995 read_sbr_invf(sbr, gb, &sbr->data[0]);
996 read_sbr_invf(sbr, gb, &sbr->data[1]);
997 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
998 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
999 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
1000 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
1003 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
1004 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
1005 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
1006 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
1011 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
1012 GetBitContext *gb, int id_aac)
1014 unsigned int cnt = get_bits_count(gb);
1016 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
1017 if (read_sbr_single_channel_element(ac, sbr, gb)) {
1019 return get_bits_count(gb) - cnt;
1021 } else if (id_aac == TYPE_CPE) {
1022 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1024 return get_bits_count(gb) - cnt;
1027 av_log(ac->avctx, AV_LOG_ERROR,
1028 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1030 return get_bits_count(gb) - cnt;
1032 if (get_bits1(gb)) { // bs_extended_data
1033 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1034 if (num_bits_left == 15)
1035 num_bits_left += get_bits(gb, 8); // bs_esc_count
1037 num_bits_left <<= 3;
1038 while (num_bits_left > 7) {
1040 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1042 if (num_bits_left < 0) {
1043 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1045 if (num_bits_left > 0)
1046 skip_bits(gb, num_bits_left);
1049 return get_bits_count(gb) - cnt;
1052 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1055 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1057 err = sbr_make_f_derived(ac, sbr);
1059 av_log(ac->avctx, AV_LOG_ERROR,
1060 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1066 * Decode Spectral Band Replication extension data; reference: table 4.55.
1068 * @param crc flag indicating the presence of CRC checksum
1069 * @param cnt length of TYPE_FIL syntactic element in bytes
1071 * @return Returns number of bytes consumed from the TYPE_FIL element.
1073 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1074 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1076 unsigned int num_sbr_bits = 0, num_align_bits;
1077 unsigned bytes_read;
1078 GetBitContext gbc = *gb_host, *gb = &gbc;
1079 skip_bits_long(gb_host, cnt*8 - 4);
1083 if (!sbr->sample_rate)
1084 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1085 if (!ac->oc[1].m4ac.ext_sample_rate)
1086 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
1089 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1093 //Save some state from the previous frame.
1094 sbr->kx[0] = sbr->kx[1];
1095 sbr->m[0] = sbr->m[1];
1096 sbr->kx_and_m_pushed = 1;
1099 if (get_bits1(gb)) // bs_header_flag
1100 num_sbr_bits += read_sbr_header(sbr, gb);
1106 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1108 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1109 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1111 if (bytes_read > cnt) {
1112 av_log(ac->avctx, AV_LOG_ERROR,
1113 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1118 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1119 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1124 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1125 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1126 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1127 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1128 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1129 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1130 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1133 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
1136 fac = temp1 / (1.0f + temp2);
1137 sbr->data[0].env_facs[e][k] = fac;
1138 sbr->data[1].env_facs[e][k] = fac * temp2;
1141 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1142 for (k = 0; k < sbr->n_q; k++) {
1143 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1144 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1147 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
1150 fac = temp1 / (1.0f + temp2);
1151 sbr->data[0].noise_facs[e][k] = fac;
1152 sbr->data[1].noise_facs[e][k] = fac * temp2;
1155 } else { // SCE or one non-coupled CPE
1156 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1157 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1158 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1159 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
1160 sbr->data[ch].env_facs[e][k] =
1161 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1162 if (sbr->data[ch].env_facs[e][k] > 1E20) {
1163 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
1164 sbr->data[ch].env_facs[e][k] = 1;
1168 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1169 for (k = 0; k < sbr->n_q; k++)
1170 sbr->data[ch].noise_facs[e][k] =
1171 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1177 * Analysis QMF Bank (14496-3 sp04 p206)
1179 * @param x pointer to the beginning of the first sample window
1180 * @param W array of complex-valued samples split into subbands
1182 #ifndef sbr_qmf_analysis
1183 static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,
1184 SBRDSPContext *sbrdsp, const float *in, float *x,
1185 float z[320], float W[2][32][32][2], int buf_idx)
1188 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1189 memcpy(x+288, in, 1024*sizeof(x[0]));
1190 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1191 // are not supported
1192 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1194 sbrdsp->qmf_pre_shuffle(z);
1195 mdct->imdct_half(mdct, z, z+64);
1196 sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
1203 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1204 * (14496-3 sp04 p206)
1206 #ifndef sbr_qmf_synthesis
1207 static void sbr_qmf_synthesis(FFTContext *mdct,
1208 SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,
1209 float *out, float X[2][38][64],
1210 float mdct_buf[2][64],
1211 float *v0, int *v_off, const unsigned int div)
1214 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1215 const int step = 128 >> div;
1217 for (i = 0; i < 32; i++) {
1218 if (*v_off < step) {
1219 int saved_samples = (1280 - 128) >> div;
1220 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1221 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1227 for (n = 0; n < 32; n++) {
1228 X[0][i][ n] = -X[0][i][n];
1229 X[0][i][32+n] = X[1][i][31-n];
1231 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1232 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1234 sbrdsp->neg_odd_64(X[1][i]);
1235 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1236 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1237 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1239 dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);
1240 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1241 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1242 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1243 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1244 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1245 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1246 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1247 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1248 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1254 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1255 * (14496-3 sp04 p214)
1256 * Warning: This routine does not seem numerically stable.
1258 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
1259 float (*alpha0)[2], float (*alpha1)[2],
1260 const float X_low[32][40][2], int k0)
1263 for (k = 0; k < k0; k++) {
1264 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
1267 dsp->autocorrelate(X_low[k], phi);
1269 dk = phi[2][1][0] * phi[1][0][0] -
1270 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1276 float temp_real, temp_im;
1277 temp_real = phi[0][0][0] * phi[1][1][0] -
1278 phi[0][0][1] * phi[1][1][1] -
1279 phi[0][1][0] * phi[1][0][0];
1280 temp_im = phi[0][0][0] * phi[1][1][1] +
1281 phi[0][0][1] * phi[1][1][0] -
1282 phi[0][1][1] * phi[1][0][0];
1284 alpha1[k][0] = temp_real / dk;
1285 alpha1[k][1] = temp_im / dk;
1288 if (!phi[1][0][0]) {
1292 float temp_real, temp_im;
1293 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1294 alpha1[k][1] * phi[1][1][1];
1295 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1296 alpha1[k][0] * phi[1][1][1];
1298 alpha0[k][0] = -temp_real / phi[1][0][0];
1299 alpha0[k][1] = -temp_im / phi[1][0][0];
1302 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1303 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1312 /// Chirp Factors (14496-3 sp04 p214)
1313 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1317 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1319 for (i = 0; i < sbr->n_q; i++) {
1320 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1323 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1325 if (new_bw < ch_data->bw_array[i]) {
1326 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1328 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1329 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1333 /// Generate the subband filtered lowband
1334 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1335 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[buf_idx][i - t_HFGen][k][0];
1345 X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
1348 buf_idx = 1-buf_idx;
1349 for (k = 0; k < sbr->kx[0]; k++) {
1350 for (i = 0; i < t_HFGen; i++) {
1351 X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
1352 X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
1358 /// High Frequency Generator (14496-3 sp04 p215)
1359 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1360 float X_high[64][40][2], const float X_low[32][40][2],
1361 const float (*alpha0)[2], const float (*alpha1)[2],
1362 const float bw_array[5], const uint8_t *t_env,
1368 for (j = 0; j < sbr->num_patches; j++) {
1369 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 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1382 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1383 alpha0[p], alpha1[p], bw_array[g],
1384 2 * t_env[0], 2 * t_env[bs_num_env]);
1387 if (k < sbr->m[1] + sbr->kx[1])
1388 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1393 /// Generate the subband filtered lowband
1394 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1395 const float Y0[38][64][2], const float Y1[38][64][2],
1396 const float X_low[32][40][2], int ch)
1400 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1401 memset(X, 0, 2*sizeof(*X));
1402 for (k = 0; k < sbr->kx[0]; k++) {
1403 for (i = 0; i < i_Temp; i++) {
1404 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1405 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1408 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1409 for (i = 0; i < i_Temp; i++) {
1410 X[0][i][k] = Y0[i + i_f][k][0];
1411 X[1][i][k] = Y0[i + i_f][k][1];
1415 for (k = 0; k < sbr->kx[1]; k++) {
1416 for (i = i_Temp; i < 38; i++) {
1417 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1418 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1421 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1422 for (i = i_Temp; i < i_f; i++) {
1423 X[0][i][k] = Y1[i][k][0];
1424 X[1][i][k] = Y1[i][k][1];
1430 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1431 * (14496-3 sp04 p217)
1433 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1434 SBRData *ch_data, int e_a[2])
1438 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1439 for (e = 0; e < ch_data->bs_num_env; e++) {
1440 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1441 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1444 if (sbr->kx[1] != table[0]) {
1445 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
1446 "Derived frequency tables were not regenerated.\n");
1450 for (i = 0; i < ilim; i++)
1451 for (m = table[i]; m < table[i + 1]; m++)
1452 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1454 // ch_data->bs_num_noise > 1 => 2 noise floors
1455 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1456 for (i = 0; i < sbr->n_q; i++)
1457 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1458 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1460 for (i = 0; i < sbr->n[1]; i++) {
1461 if (ch_data->bs_add_harmonic_flag) {
1462 const unsigned int m_midpoint =
1463 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1465 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1466 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1470 for (i = 0; i < ilim; i++) {
1471 int additional_sinusoid_present = 0;
1472 for (m = table[i]; m < table[i + 1]; m++) {
1473 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1474 additional_sinusoid_present = 1;
1478 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1479 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1483 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1487 /// Estimation of current envelope (14496-3 sp04 p218)
1488 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1489 SpectralBandReplication *sbr, SBRData *ch_data)
1492 int kx1 = sbr->kx[1];
1494 if (sbr->bs_interpol_freq) {
1495 for (e = 0; e < ch_data->bs_num_env; e++) {
1496 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1497 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1498 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1500 for (m = 0; m < sbr->m[1]; m++) {
1501 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1502 e_curr[e][m] = sum * recip_env_size;
1508 for (e = 0; e < ch_data->bs_num_env; e++) {
1509 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1510 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1511 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1512 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1514 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1516 const int den = env_size * (table[p + 1] - table[p]);
1518 for (k = table[p]; k < table[p + 1]; k++) {
1519 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1522 for (k = table[p]; k < table[p + 1]; k++) {
1523 e_curr[e][k - kx1] = sum;
1531 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1532 * and Calculation of gain (14496-3 sp04 p219)
1534 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1535 SBRData *ch_data, const int e_a[2])
1538 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1539 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1541 for (e = 0; e < ch_data->bs_num_env; e++) {
1542 int delta = !((e == e_a[1]) || (e == e_a[0]));
1543 for (k = 0; k < sbr->n_lim; k++) {
1544 float gain_boost, gain_max;
1545 float sum[2] = { 0.0f, 0.0f };
1546 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1547 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1548 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1549 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1550 if (!sbr->s_mapped[e][m]) {
1551 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1552 ((1.0f + sbr->e_curr[e][m]) *
1553 (1.0f + sbr->q_mapped[e][m] * delta)));
1555 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1556 ((1.0f + sbr->e_curr[e][m]) *
1557 (1.0f + sbr->q_mapped[e][m])));
1560 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1561 sum[0] += sbr->e_origmapped[e][m];
1562 sum[1] += sbr->e_curr[e][m];
1564 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1565 gain_max = FFMIN(100000.f, gain_max);
1566 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1567 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1568 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1569 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1571 sum[0] = sum[1] = 0.0f;
1572 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1573 sum[0] += sbr->e_origmapped[e][m];
1574 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1575 + sbr->s_m[e][m] * sbr->s_m[e][m]
1576 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1578 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1579 gain_boost = FFMIN(1.584893192f, gain_boost);
1580 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1581 sbr->gain[e][m] *= gain_boost;
1582 sbr->q_m[e][m] *= gain_boost;
1583 sbr->s_m[e][m] *= gain_boost;
1589 /// Assembling HF Signals (14496-3 sp04 p220)
1590 static void sbr_hf_assemble(float Y1[38][64][2],
1591 const float X_high[64][40][2],
1592 SpectralBandReplication *sbr, SBRData *ch_data,
1596 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1597 const int kx = sbr->kx[1];
1598 const int m_max = sbr->m[1];
1599 static const float h_smooth[5] = {
1606 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1607 int indexnoise = ch_data->f_indexnoise;
1608 int indexsine = ch_data->f_indexsine;
1611 for (i = 0; i < h_SL; i++) {
1612 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1613 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1616 for (i = 0; i < 4; i++) {
1617 memcpy(g_temp[i + 2 * ch_data->t_env[0]],
1618 g_temp[i + 2 * ch_data->t_env_num_env_old],
1620 memcpy(q_temp[i + 2 * ch_data->t_env[0]],
1621 q_temp[i + 2 * ch_data->t_env_num_env_old],
1626 for (e = 0; e < ch_data->bs_num_env; e++) {
1627 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1628 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1629 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1633 for (e = 0; e < ch_data->bs_num_env; e++) {
1634 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1635 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
1636 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
1637 float *g_filt, *q_filt;
1639 if (h_SL && e != e_a[0] && e != e_a[1]) {
1640 g_filt = g_filt_tab;
1641 q_filt = q_filt_tab;
1642 for (m = 0; m < m_max; m++) {
1643 const int idx1 = i + h_SL;
1646 for (j = 0; j <= h_SL; j++) {
1647 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
1648 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
1652 g_filt = g_temp[i + h_SL];
1656 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
1657 i + ENVELOPE_ADJUSTMENT_OFFSET);
1659 if (e != e_a[0] && e != e_a[1]) {
1660 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
1664 int idx = indexsine&1;
1665 int A = (1-((indexsine+(kx & 1))&2));
1666 int B = (A^(-idx)) + idx;
1667 float *out = &Y1[i][kx][idx];
1668 float *in = sbr->s_m[e];
1669 for (m = 0; m+1 < m_max; m+=2) {
1670 out[2*m ] += in[m ] * A;
1671 out[2*m+2] += in[m+1] * B;
1674 out[2*m ] += in[m ] * A;
1676 indexnoise = (indexnoise + m_max) & 0x1ff;
1677 indexsine = (indexsine + 1) & 3;
1680 ch_data->f_indexnoise = indexnoise;
1681 ch_data->f_indexsine = indexsine;
1684 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1687 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
1689 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1692 if (!sbr->kx_and_m_pushed) {
1693 sbr->kx[0] = sbr->kx[1];
1694 sbr->m[0] = sbr->m[1];
1696 sbr->kx_and_m_pushed = 0;
1700 sbr_dequant(sbr, id_aac);
1702 for (ch = 0; ch < nch; ch++) {
1703 /* decode channel */
1704 sbr_qmf_analysis(ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1705 (float*)sbr->qmf_filter_scratch,
1706 sbr->data[ch].W, sbr->data[ch].Ypos);
1707 sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low,
1708 (const float (*)[32][32][2]) sbr->data[ch].W,
1709 sbr->data[ch].Ypos);
1710 sbr->data[ch].Ypos ^= 1;
1712 sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,
1713 (const float (*)[40][2]) sbr->X_low, sbr->k[0]);
1714 sbr_chirp(sbr, &sbr->data[ch]);
1715 sbr_hf_gen(ac, sbr, sbr->X_high,
1716 (const float (*)[40][2]) sbr->X_low,
1717 (const float (*)[2]) sbr->alpha0,
1718 (const float (*)[2]) sbr->alpha1,
1719 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1720 sbr->data[ch].bs_num_env);
1723 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1725 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1726 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1727 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1728 (const float (*)[40][2]) sbr->X_high,
1729 sbr, &sbr->data[ch],
1735 sbr->c.sbr_x_gen(sbr, sbr->X[ch],
1736 (const float (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1737 (const float (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos],
1738 (const float (*)[40][2]) sbr->X_low, ch);
1741 if (ac->oc[1].m4ac.ps == 1) {
1742 if (sbr->ps.start) {
1743 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1745 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1750 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,
1751 L, sbr->X[0], sbr->qmf_filter_scratch,
1752 sbr->data[0].synthesis_filterbank_samples,
1753 &sbr->data[0].synthesis_filterbank_samples_offset,
1756 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,
1757 R, sbr->X[1], sbr->qmf_filter_scratch,
1758 sbr->data[1].synthesis_filterbank_samples,
1759 &sbr->data[1].synthesis_filterbank_samples_offset,
1763 static void aacsbr_func_ptr_init(AACSBRContext *c)
1765 c->sbr_lf_gen = sbr_lf_gen;
1766 c->sbr_hf_assemble = sbr_hf_assemble;
1767 c->sbr_x_gen = sbr_x_gen;
1768 c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;
1771 ff_aacsbr_func_ptr_init_mips(c);