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"
36 #include "libavutil/internal.h"
37 #include "libavutil/libm.h"
38 #include "libavutil/avassert.h"
44 #define ENVELOPE_ADJUSTMENT_OFFSET 2
45 #define NOISE_FLOOR_OFFSET 6.0f
48 #include "mips/aacsbr_mips.h"
49 #endif /* ARCH_MIPS */
57 T_HUFFMAN_ENV_BAL_1_5DB,
58 F_HUFFMAN_ENV_BAL_1_5DB,
61 T_HUFFMAN_ENV_BAL_3_0DB,
62 F_HUFFMAN_ENV_BAL_3_0DB,
63 T_HUFFMAN_NOISE_3_0DB,
64 T_HUFFMAN_NOISE_BAL_3_0DB,
68 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
81 static VLC vlc_sbr[10];
82 static const int8_t vlc_sbr_lav[10] =
83 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
85 #define SBR_INIT_VLC_STATIC(num, size) \
86 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
87 sbr_tmp[num].sbr_bits , 1, 1, \
88 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
91 #define SBR_VLC_ROW(name) \
92 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
94 static void aacsbr_func_ptr_init(AACSBRContext *c);
96 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);
127 for (n = 1; n < 320; n++)
128 sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
129 sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
130 sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
132 for (n = 0; n < 320; n++)
133 sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
138 /** Places SBR in pure upsampling mode. */
139 static void sbr_turnoff(SpectralBandReplication *sbr) {
141 // Init defults used in pure upsampling mode
142 sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
144 // Reset values for first SBR header
145 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
146 memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
149 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
151 if(sbr->mdct.mdct_bits)
153 sbr->kx[0] = sbr->kx[1];
155 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
156 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
157 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
158 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
159 * and scale back down at synthesis. */
160 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));
161 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
162 ff_ps_ctx_init(&sbr->ps);
163 ff_sbrdsp_init(&sbr->dsp);
164 aacsbr_func_ptr_init(&sbr->c);
167 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
169 ff_mdct_end(&sbr->mdct);
170 ff_mdct_end(&sbr->mdct_ana);
173 static int qsort_comparison_function_int16(const void *a, const void *b)
175 return *(const int16_t *)a - *(const int16_t *)b;
178 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
181 for (i = 0; i <= last_el; i++)
182 if (table[i] == needle)
187 /// Limiter Frequency Band Table (14496-3 sp04 p198)
188 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
191 if (sbr->bs_limiter_bands > 0) {
192 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
193 1.18509277094158210129f, //2^(0.49/2)
194 1.11987160404675912501f }; //2^(0.49/3)
195 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
196 int16_t patch_borders[7];
197 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
199 patch_borders[0] = sbr->kx[1];
200 for (k = 1; k <= sbr->num_patches; k++)
201 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
203 memcpy(sbr->f_tablelim, sbr->f_tablelow,
204 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
205 if (sbr->num_patches > 1)
206 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
207 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
209 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
210 sizeof(sbr->f_tablelim[0]),
211 qsort_comparison_function_int16);
213 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
214 while (out < sbr->f_tablelim + sbr->n_lim) {
215 if (*in >= *out * lim_bands_per_octave_warped) {
217 } else if (*in == *out ||
218 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
221 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
229 sbr->f_tablelim[0] = sbr->f_tablelow[0];
230 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
235 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
237 unsigned int cnt = get_bits_count(gb);
238 uint8_t bs_header_extra_1;
239 uint8_t bs_header_extra_2;
240 int old_bs_limiter_bands = sbr->bs_limiter_bands;
241 SpectrumParameters old_spectrum_params;
245 // Save last spectrum parameters variables to compare to new ones
246 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
248 sbr->bs_amp_res_header = get_bits1(gb);
249 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
250 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
251 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
252 skip_bits(gb, 2); // bs_reserved
254 bs_header_extra_1 = get_bits1(gb);
255 bs_header_extra_2 = get_bits1(gb);
257 if (bs_header_extra_1) {
258 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
259 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
260 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
262 sbr->spectrum_params.bs_freq_scale = 2;
263 sbr->spectrum_params.bs_alter_scale = 1;
264 sbr->spectrum_params.bs_noise_bands = 2;
267 // Check if spectrum parameters changed
268 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
271 if (bs_header_extra_2) {
272 sbr->bs_limiter_bands = get_bits(gb, 2);
273 sbr->bs_limiter_gains = get_bits(gb, 2);
274 sbr->bs_interpol_freq = get_bits1(gb);
275 sbr->bs_smoothing_mode = get_bits1(gb);
277 sbr->bs_limiter_bands = 2;
278 sbr->bs_limiter_gains = 2;
279 sbr->bs_interpol_freq = 1;
280 sbr->bs_smoothing_mode = 1;
283 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
284 sbr_make_f_tablelim(sbr);
286 return get_bits_count(gb) - cnt;
289 static int array_min_int16(const int16_t *array, int nel)
291 int i, min = array[0];
292 for (i = 1; i < nel; i++)
293 min = FFMIN(array[i], min);
297 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
299 int k, previous, present;
302 base = powf((float)stop / start, 1.0f / num_bands);
306 for (k = 0; k < num_bands-1; k++) {
308 present = lrintf(prod);
309 bands[k] = present - previous;
312 bands[num_bands-1] = stop - previous;
315 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
317 // Requirements (14496-3 sp04 p205)
319 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
322 if (bs_xover_band >= n_master) {
323 av_log(avctx, AV_LOG_ERROR,
324 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
331 /// Master Frequency Band Table (14496-3 sp04 p194)
332 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
333 SpectrumParameters *spectrum)
335 unsigned int temp, max_qmf_subbands;
336 unsigned int start_min, stop_min;
338 const int8_t *sbr_offset_ptr;
341 if (sbr->sample_rate < 32000) {
343 } else if (sbr->sample_rate < 64000) {
348 switch (sbr->sample_rate) {
350 sbr_offset_ptr = sbr_offset[0];
353 sbr_offset_ptr = sbr_offset[1];
356 sbr_offset_ptr = sbr_offset[2];
359 sbr_offset_ptr = sbr_offset[3];
361 case 44100: case 48000: case 64000:
362 sbr_offset_ptr = sbr_offset[4];
364 case 88200: case 96000: case 128000: case 176400: case 192000:
365 sbr_offset_ptr = sbr_offset[5];
368 av_log(ac->avctx, AV_LOG_ERROR,
369 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
373 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
374 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
376 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
378 if (spectrum->bs_stop_freq < 14) {
379 sbr->k[2] = stop_min;
380 make_bands(stop_dk, stop_min, 64, 13);
381 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
382 for (k = 0; k < spectrum->bs_stop_freq; k++)
383 sbr->k[2] += stop_dk[k];
384 } else if (spectrum->bs_stop_freq == 14) {
385 sbr->k[2] = 2*sbr->k[0];
386 } else if (spectrum->bs_stop_freq == 15) {
387 sbr->k[2] = 3*sbr->k[0];
389 av_log(ac->avctx, AV_LOG_ERROR,
390 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
393 sbr->k[2] = FFMIN(64, sbr->k[2]);
395 // Requirements (14496-3 sp04 p205)
396 if (sbr->sample_rate <= 32000) {
397 max_qmf_subbands = 48;
398 } else if (sbr->sample_rate == 44100) {
399 max_qmf_subbands = 35;
400 } else if (sbr->sample_rate >= 48000)
401 max_qmf_subbands = 32;
405 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
406 av_log(ac->avctx, AV_LOG_ERROR,
407 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
411 if (!spectrum->bs_freq_scale) {
414 dk = spectrum->bs_alter_scale + 1;
415 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
416 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
419 for (k = 1; k <= sbr->n_master; k++)
420 sbr->f_master[k] = dk;
422 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
425 sbr->f_master[2]-= (k2diff < -1);
427 sbr->f_master[sbr->n_master]++;
430 sbr->f_master[0] = sbr->k[0];
431 for (k = 1; k <= sbr->n_master; k++)
432 sbr->f_master[k] += sbr->f_master[k - 1];
435 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
436 int two_regions, num_bands_0;
437 int vdk0_max, vdk1_min;
440 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
442 sbr->k[1] = 2 * sbr->k[0];
445 sbr->k[1] = sbr->k[2];
448 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
450 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
451 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
457 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
459 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
460 vdk0_max = vk0[num_bands_0];
463 for (k = 1; k <= num_bands_0; k++) {
464 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
465 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
473 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
474 : 1.0f; // bs_alter_scale = {0,1}
475 int num_bands_1 = lrintf(half_bands * invwarp *
476 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
478 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
480 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
482 if (vdk1_min < vdk0_max) {
484 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
485 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
487 vk1[num_bands_1] -= change;
490 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
493 for (k = 1; k <= num_bands_1; k++) {
494 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
495 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
501 sbr->n_master = num_bands_0 + num_bands_1;
502 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
504 memcpy(&sbr->f_master[0], vk0,
505 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
506 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
507 num_bands_1 * sizeof(sbr->f_master[0]));
510 sbr->n_master = num_bands_0;
511 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
513 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
520 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
521 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
525 int usb = sbr->kx[1];
526 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
528 sbr->num_patches = 0;
530 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
531 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
537 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
538 sb = sbr->f_master[i];
539 odd = (sb + sbr->k[0]) & 1;
542 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
543 // After this check the final number of patches can still be six which is
544 // illegal however the Coding Technologies decoder check stream has a final
545 // count of 6 patches
546 if (sbr->num_patches > 5) {
547 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
551 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
552 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
554 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
561 if (sbr->f_master[k] - sb < 3)
563 } while (sb != sbr->kx[1] + sbr->m[1]);
565 if (sbr->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches-1] < 3)
571 /// Derived Frequency Band Tables (14496-3 sp04 p197)
572 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
576 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
577 sbr->n[0] = (sbr->n[1] + 1) >> 1;
579 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
580 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
581 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
582 sbr->kx[1] = sbr->f_tablehigh[0];
584 // Requirements (14496-3 sp04 p205)
585 if (sbr->kx[1] + sbr->m[1] > 64) {
586 av_log(ac->avctx, AV_LOG_ERROR,
587 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
590 if (sbr->kx[1] > 32) {
591 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
595 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
596 temp = sbr->n[1] & 1;
597 for (k = 1; k <= sbr->n[0]; k++)
598 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
600 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
601 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
603 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
607 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
609 for (k = 1; k <= sbr->n_q; k++) {
610 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
611 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
614 if (sbr_hf_calc_npatches(ac, sbr) < 0)
617 sbr_make_f_tablelim(sbr);
619 sbr->data[0].f_indexnoise = 0;
620 sbr->data[1].f_indexnoise = 0;
625 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
629 for (i = 0; i < elements; i++) {
630 vec[i] = get_bits1(gb);
634 /** ceil(log2(index+1)) */
635 static const int8_t ceil_log2[] = {
639 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
640 GetBitContext *gb, SBRData *ch_data)
643 unsigned bs_pointer = 0;
644 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
645 int abs_bord_trail = 16;
646 int num_rel_lead, num_rel_trail;
647 unsigned bs_num_env_old = ch_data->bs_num_env;
649 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
650 ch_data->bs_amp_res = sbr->bs_amp_res_header;
651 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
653 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
655 ch_data->bs_num_env = 1 << get_bits(gb, 2);
656 num_rel_lead = ch_data->bs_num_env - 1;
657 if (ch_data->bs_num_env == 1)
658 ch_data->bs_amp_res = 0;
660 if (ch_data->bs_num_env > 4) {
661 av_log(ac->avctx, AV_LOG_ERROR,
662 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
663 ch_data->bs_num_env);
667 ch_data->t_env[0] = 0;
668 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
670 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
672 for (i = 0; i < num_rel_lead; i++)
673 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
675 ch_data->bs_freq_res[1] = get_bits1(gb);
676 for (i = 1; i < ch_data->bs_num_env; i++)
677 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
680 abs_bord_trail += get_bits(gb, 2);
681 num_rel_trail = get_bits(gb, 2);
682 ch_data->bs_num_env = num_rel_trail + 1;
683 ch_data->t_env[0] = 0;
684 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
686 for (i = 0; i < num_rel_trail; i++)
687 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
688 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
690 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
692 for (i = 0; i < ch_data->bs_num_env; i++)
693 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
696 ch_data->t_env[0] = get_bits(gb, 2);
697 num_rel_lead = get_bits(gb, 2);
698 ch_data->bs_num_env = num_rel_lead + 1;
699 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
701 for (i = 0; i < num_rel_lead; i++)
702 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
704 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
706 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
709 ch_data->t_env[0] = get_bits(gb, 2);
710 abs_bord_trail += get_bits(gb, 2);
711 num_rel_lead = get_bits(gb, 2);
712 num_rel_trail = get_bits(gb, 2);
713 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
715 if (ch_data->bs_num_env > 5) {
716 av_log(ac->avctx, AV_LOG_ERROR,
717 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
718 ch_data->bs_num_env);
722 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
724 for (i = 0; i < num_rel_lead; i++)
725 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
726 for (i = 0; i < num_rel_trail; i++)
727 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
728 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
730 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
732 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
736 if (bs_pointer > ch_data->bs_num_env + 1) {
737 av_log(ac->avctx, AV_LOG_ERROR,
738 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
743 for (i = 1; i <= ch_data->bs_num_env; i++) {
744 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
745 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
750 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
752 ch_data->t_q[0] = ch_data->t_env[0];
753 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
754 if (ch_data->bs_num_noise > 1) {
756 if (ch_data->bs_frame_class == FIXFIX) {
757 idx = ch_data->bs_num_env >> 1;
758 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
759 idx = ch_data->bs_num_env - FFMAX((int)bs_pointer - 1, 1);
763 else if (bs_pointer == 1)
764 idx = ch_data->bs_num_env - 1;
765 else // bs_pointer > 1
766 idx = bs_pointer - 1;
768 ch_data->t_q[1] = ch_data->t_env[idx];
771 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
772 ch_data->e_a[1] = -1;
773 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
774 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
775 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
776 ch_data->e_a[1] = bs_pointer - 1;
781 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
782 //These variables are saved from the previous frame rather than copied
783 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
784 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
785 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
787 //These variables are read from the bitstream and therefore copied
788 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
789 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
790 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
791 dst->bs_num_env = src->bs_num_env;
792 dst->bs_amp_res = src->bs_amp_res;
793 dst->bs_num_noise = src->bs_num_noise;
794 dst->bs_frame_class = src->bs_frame_class;
795 dst->e_a[1] = src->e_a[1];
798 /// Read how the envelope and noise floor data is delta coded
799 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
802 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
803 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
806 /// Read inverse filtering data
807 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
812 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
813 for (i = 0; i < sbr->n_q; i++)
814 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
817 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
818 SBRData *ch_data, int ch)
822 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
824 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
825 const int odd = sbr->n[1] & 1;
827 if (sbr->bs_coupling && ch) {
828 if (ch_data->bs_amp_res) {
830 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
831 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
832 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
833 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
836 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
837 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
838 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
839 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
842 if (ch_data->bs_amp_res) {
844 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
845 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
846 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
847 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
850 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
851 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
852 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
853 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
857 for (i = 0; i < ch_data->bs_num_env; i++) {
858 if (ch_data->bs_df_env[i]) {
859 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
860 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
861 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
862 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
863 } else if (ch_data->bs_freq_res[i + 1]) {
864 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
865 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
866 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
869 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
870 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
871 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
875 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
876 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
877 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);
881 //assign 0th elements of env_facs from last elements
882 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
883 sizeof(ch_data->env_facs[0]));
886 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
887 SBRData *ch_data, int ch)
890 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
892 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
894 if (sbr->bs_coupling && ch) {
895 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
896 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
897 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
898 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
900 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
901 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
902 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
903 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
906 for (i = 0; i < ch_data->bs_num_noise; i++) {
907 if (ch_data->bs_df_noise[i]) {
908 for (j = 0; j < sbr->n_q; j++)
909 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
911 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
912 for (j = 1; j < sbr->n_q; j++)
913 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);
917 //assign 0th elements of noise_facs from last elements
918 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
919 sizeof(ch_data->noise_facs[0]));
922 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
924 int bs_extension_id, int *num_bits_left)
926 switch (bs_extension_id) {
927 case EXTENSION_ID_PS:
928 if (!ac->oc[1].m4ac.ps) {
929 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
930 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
934 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
936 avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");
937 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
943 // some files contain 0-padding
944 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
945 avpriv_request_sample(ac->avctx, "Reserved SBR extensions");
946 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
952 static int read_sbr_single_channel_element(AACContext *ac,
953 SpectralBandReplication *sbr,
956 if (get_bits1(gb)) // bs_data_extra
957 skip_bits(gb, 4); // bs_reserved
959 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
961 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
962 read_sbr_invf(sbr, gb, &sbr->data[0]);
963 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
964 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
966 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
967 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
972 static int read_sbr_channel_pair_element(AACContext *ac,
973 SpectralBandReplication *sbr,
976 if (get_bits1(gb)) // bs_data_extra
977 skip_bits(gb, 8); // bs_reserved
979 if ((sbr->bs_coupling = get_bits1(gb))) {
980 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
982 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
983 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
984 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
985 read_sbr_invf(sbr, gb, &sbr->data[0]);
986 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
987 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
988 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
989 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
990 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
991 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
993 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
994 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
996 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
997 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
998 read_sbr_invf(sbr, gb, &sbr->data[0]);
999 read_sbr_invf(sbr, gb, &sbr->data[1]);
1000 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
1001 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
1002 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
1003 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
1006 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
1007 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
1008 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
1009 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
1014 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
1015 GetBitContext *gb, int id_aac)
1017 unsigned int cnt = get_bits_count(gb);
1019 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
1020 if (read_sbr_single_channel_element(ac, sbr, gb)) {
1022 return get_bits_count(gb) - cnt;
1024 } else if (id_aac == TYPE_CPE) {
1025 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1027 return get_bits_count(gb) - cnt;
1030 av_log(ac->avctx, AV_LOG_ERROR,
1031 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1033 return get_bits_count(gb) - cnt;
1035 if (get_bits1(gb)) { // bs_extended_data
1036 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1037 if (num_bits_left == 15)
1038 num_bits_left += get_bits(gb, 8); // bs_esc_count
1040 num_bits_left <<= 3;
1041 while (num_bits_left > 7) {
1043 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1045 if (num_bits_left < 0) {
1046 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1048 if (num_bits_left > 0)
1049 skip_bits(gb, num_bits_left);
1052 return get_bits_count(gb) - cnt;
1055 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1058 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1060 err = sbr_make_f_derived(ac, sbr);
1062 av_log(ac->avctx, AV_LOG_ERROR,
1063 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1069 * Decode Spectral Band Replication extension data; reference: table 4.55.
1071 * @param crc flag indicating the presence of CRC checksum
1072 * @param cnt length of TYPE_FIL syntactic element in bytes
1074 * @return Returns number of bytes consumed from the TYPE_FIL element.
1076 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1077 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1079 unsigned int num_sbr_bits = 0, num_align_bits;
1080 unsigned bytes_read;
1081 GetBitContext gbc = *gb_host, *gb = &gbc;
1082 skip_bits_long(gb_host, cnt*8 - 4);
1086 if (!sbr->sample_rate)
1087 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1088 if (!ac->oc[1].m4ac.ext_sample_rate)
1089 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
1092 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1096 //Save some state from the previous frame.
1097 sbr->kx[0] = sbr->kx[1];
1098 sbr->m[0] = sbr->m[1];
1099 sbr->kx_and_m_pushed = 1;
1102 if (get_bits1(gb)) // bs_header_flag
1103 num_sbr_bits += read_sbr_header(sbr, gb);
1109 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1111 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1112 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1114 if (bytes_read > cnt) {
1115 av_log(ac->avctx, AV_LOG_ERROR,
1116 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1121 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1122 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1127 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1128 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1129 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1130 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1131 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1132 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1133 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1136 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
1139 fac = temp1 / (1.0f + temp2);
1140 sbr->data[0].env_facs[e][k] = fac;
1141 sbr->data[1].env_facs[e][k] = fac * temp2;
1144 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1145 for (k = 0; k < sbr->n_q; k++) {
1146 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1147 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1150 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
1153 fac = temp1 / (1.0f + temp2);
1154 sbr->data[0].noise_facs[e][k] = fac;
1155 sbr->data[1].noise_facs[e][k] = fac * temp2;
1158 } else { // SCE or one non-coupled CPE
1159 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1160 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1161 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1162 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
1163 sbr->data[ch].env_facs[e][k] =
1164 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1165 if (sbr->data[ch].env_facs[e][k] > 1E20) {
1166 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
1167 sbr->data[ch].env_facs[e][k] = 1;
1171 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1172 for (k = 0; k < sbr->n_q; k++)
1173 sbr->data[ch].noise_facs[e][k] =
1174 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1180 * Analysis QMF Bank (14496-3 sp04 p206)
1182 * @param x pointer to the beginning of the first sample window
1183 * @param W array of complex-valued samples split into subbands
1185 #ifndef sbr_qmf_analysis
1186 static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,
1187 SBRDSPContext *sbrdsp, const float *in, float *x,
1188 float z[320], float W[2][32][32][2], int buf_idx)
1191 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1192 memcpy(x+288, in, 1024*sizeof(x[0]));
1193 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1194 // are not supported
1195 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1197 sbrdsp->qmf_pre_shuffle(z);
1198 mdct->imdct_half(mdct, z, z+64);
1199 sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
1206 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1207 * (14496-3 sp04 p206)
1209 #ifndef sbr_qmf_synthesis
1210 static void sbr_qmf_synthesis(FFTContext *mdct,
1211 SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,
1212 float *out, float X[2][38][64],
1213 float mdct_buf[2][64],
1214 float *v0, int *v_off, const unsigned int div)
1217 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1218 const int step = 128 >> div;
1220 for (i = 0; i < 32; i++) {
1221 if (*v_off < step) {
1222 int saved_samples = (1280 - 128) >> div;
1223 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1224 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1230 for (n = 0; n < 32; n++) {
1231 X[0][i][ n] = -X[0][i][n];
1232 X[0][i][32+n] = X[1][i][31-n];
1234 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1235 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1237 sbrdsp->neg_odd_64(X[1][i]);
1238 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1239 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1240 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1242 dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);
1243 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1244 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1245 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1246 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1247 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1248 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1249 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1250 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1251 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1257 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1258 * (14496-3 sp04 p214)
1259 * Warning: This routine does not seem numerically stable.
1261 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
1262 float (*alpha0)[2], float (*alpha1)[2],
1263 const float X_low[32][40][2], int k0)
1266 for (k = 0; k < k0; k++) {
1267 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
1270 dsp->autocorrelate(X_low[k], phi);
1272 dk = phi[2][1][0] * phi[1][0][0] -
1273 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1279 float temp_real, temp_im;
1280 temp_real = phi[0][0][0] * phi[1][1][0] -
1281 phi[0][0][1] * phi[1][1][1] -
1282 phi[0][1][0] * phi[1][0][0];
1283 temp_im = phi[0][0][0] * phi[1][1][1] +
1284 phi[0][0][1] * phi[1][1][0] -
1285 phi[0][1][1] * phi[1][0][0];
1287 alpha1[k][0] = temp_real / dk;
1288 alpha1[k][1] = temp_im / dk;
1291 if (!phi[1][0][0]) {
1295 float temp_real, temp_im;
1296 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1297 alpha1[k][1] * phi[1][1][1];
1298 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1299 alpha1[k][0] * phi[1][1][1];
1301 alpha0[k][0] = -temp_real / phi[1][0][0];
1302 alpha0[k][1] = -temp_im / phi[1][0][0];
1305 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1306 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1315 /// Chirp Factors (14496-3 sp04 p214)
1316 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1320 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1322 for (i = 0; i < sbr->n_q; i++) {
1323 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1326 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1328 if (new_bw < ch_data->bw_array[i]) {
1329 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1331 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1332 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1336 /// Generate the subband filtered lowband
1337 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1338 float X_low[32][40][2], const float W[2][32][32][2],
1342 const int t_HFGen = 8;
1344 memset(X_low, 0, 32*sizeof(*X_low));
1345 for (k = 0; k < sbr->kx[1]; k++) {
1346 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1347 X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
1348 X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
1351 buf_idx = 1-buf_idx;
1352 for (k = 0; k < sbr->kx[0]; k++) {
1353 for (i = 0; i < t_HFGen; i++) {
1354 X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
1355 X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
1361 /// High Frequency Generator (14496-3 sp04 p215)
1362 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1363 float X_high[64][40][2], const float X_low[32][40][2],
1364 const float (*alpha0)[2], const float (*alpha1)[2],
1365 const float bw_array[5], const uint8_t *t_env,
1371 for (j = 0; j < sbr->num_patches; j++) {
1372 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1373 const int p = sbr->patch_start_subband[j] + x;
1374 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1379 av_log(ac->avctx, AV_LOG_ERROR,
1380 "ERROR : no subband found for frequency %d\n", k);
1384 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1385 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1386 alpha0[p], alpha1[p], bw_array[g],
1387 2 * t_env[0], 2 * t_env[bs_num_env]);
1390 if (k < sbr->m[1] + sbr->kx[1])
1391 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1396 /// Generate the subband filtered lowband
1397 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1398 const float Y0[38][64][2], const float Y1[38][64][2],
1399 const float X_low[32][40][2], int ch)
1403 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1404 memset(X, 0, 2*sizeof(*X));
1405 for (k = 0; k < sbr->kx[0]; k++) {
1406 for (i = 0; i < i_Temp; i++) {
1407 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1408 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1411 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1412 for (i = 0; i < i_Temp; i++) {
1413 X[0][i][k] = Y0[i + i_f][k][0];
1414 X[1][i][k] = Y0[i + i_f][k][1];
1418 for (k = 0; k < sbr->kx[1]; k++) {
1419 for (i = i_Temp; i < 38; i++) {
1420 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1421 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1424 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1425 for (i = i_Temp; i < i_f; i++) {
1426 X[0][i][k] = Y1[i][k][0];
1427 X[1][i][k] = Y1[i][k][1];
1433 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1434 * (14496-3 sp04 p217)
1436 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1437 SBRData *ch_data, int e_a[2])
1441 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1442 for (e = 0; e < ch_data->bs_num_env; e++) {
1443 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1444 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1447 if (sbr->kx[1] != table[0]) {
1448 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
1449 "Derived frequency tables were not regenerated.\n");
1453 for (i = 0; i < ilim; i++)
1454 for (m = table[i]; m < table[i + 1]; m++)
1455 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1457 // ch_data->bs_num_noise > 1 => 2 noise floors
1458 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1459 for (i = 0; i < sbr->n_q; i++)
1460 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1461 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1463 for (i = 0; i < sbr->n[1]; i++) {
1464 if (ch_data->bs_add_harmonic_flag) {
1465 const unsigned int m_midpoint =
1466 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1468 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1469 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1473 for (i = 0; i < ilim; i++) {
1474 int additional_sinusoid_present = 0;
1475 for (m = table[i]; m < table[i + 1]; m++) {
1476 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1477 additional_sinusoid_present = 1;
1481 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1482 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1486 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1490 /// Estimation of current envelope (14496-3 sp04 p218)
1491 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1492 SpectralBandReplication *sbr, SBRData *ch_data)
1495 int kx1 = sbr->kx[1];
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++) {
1504 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1505 e_curr[e][m] = sum * recip_env_size;
1511 for (e = 0; e < ch_data->bs_num_env; e++) {
1512 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1513 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1514 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1515 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1517 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1519 const int den = env_size * (table[p + 1] - table[p]);
1521 for (k = table[p]; k < table[p + 1]; k++) {
1522 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1525 for (k = table[p]; k < table[p + 1]; k++) {
1526 e_curr[e][k - kx1] = sum;
1534 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1535 * and Calculation of gain (14496-3 sp04 p219)
1537 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1538 SBRData *ch_data, const int e_a[2])
1541 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1542 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1544 for (e = 0; e < ch_data->bs_num_env; e++) {
1545 int delta = !((e == e_a[1]) || (e == e_a[0]));
1546 for (k = 0; k < sbr->n_lim; k++) {
1547 float gain_boost, gain_max;
1548 float sum[2] = { 0.0f, 0.0f };
1549 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1550 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1551 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1552 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1553 if (!sbr->s_mapped[e][m]) {
1554 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1555 ((1.0f + sbr->e_curr[e][m]) *
1556 (1.0f + sbr->q_mapped[e][m] * delta)));
1558 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1559 ((1.0f + sbr->e_curr[e][m]) *
1560 (1.0f + sbr->q_mapped[e][m])));
1563 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1564 sum[0] += sbr->e_origmapped[e][m];
1565 sum[1] += sbr->e_curr[e][m];
1567 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1568 gain_max = FFMIN(100000.f, gain_max);
1569 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1570 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1571 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1572 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1574 sum[0] = sum[1] = 0.0f;
1575 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1576 sum[0] += sbr->e_origmapped[e][m];
1577 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1578 + sbr->s_m[e][m] * sbr->s_m[e][m]
1579 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1581 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1582 gain_boost = FFMIN(1.584893192f, gain_boost);
1583 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1584 sbr->gain[e][m] *= gain_boost;
1585 sbr->q_m[e][m] *= gain_boost;
1586 sbr->s_m[e][m] *= gain_boost;
1592 /// Assembling HF Signals (14496-3 sp04 p220)
1593 static void sbr_hf_assemble(float Y1[38][64][2],
1594 const float X_high[64][40][2],
1595 SpectralBandReplication *sbr, SBRData *ch_data,
1599 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1600 const int kx = sbr->kx[1];
1601 const int m_max = sbr->m[1];
1602 static const float h_smooth[5] = {
1609 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1610 int indexnoise = ch_data->f_indexnoise;
1611 int indexsine = ch_data->f_indexsine;
1614 for (i = 0; i < h_SL; i++) {
1615 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1616 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1619 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1620 memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1623 for (e = 0; e < ch_data->bs_num_env; e++) {
1624 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1625 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1626 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1630 for (e = 0; e < ch_data->bs_num_env; e++) {
1631 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1632 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
1633 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
1634 float *g_filt, *q_filt;
1636 if (h_SL && e != e_a[0] && e != e_a[1]) {
1637 g_filt = g_filt_tab;
1638 q_filt = q_filt_tab;
1639 for (m = 0; m < m_max; m++) {
1640 const int idx1 = i + h_SL;
1643 for (j = 0; j <= h_SL; j++) {
1644 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
1645 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
1649 g_filt = g_temp[i + h_SL];
1653 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
1654 i + ENVELOPE_ADJUSTMENT_OFFSET);
1656 if (e != e_a[0] && e != e_a[1]) {
1657 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
1661 int idx = indexsine&1;
1662 int A = (1-((indexsine+(kx & 1))&2));
1663 int B = (A^(-idx)) + idx;
1664 float *out = &Y1[i][kx][idx];
1665 float *in = sbr->s_m[e];
1666 for (m = 0; m+1 < m_max; m+=2) {
1667 out[2*m ] += in[m ] * A;
1668 out[2*m+2] += in[m+1] * B;
1671 out[2*m ] += in[m ] * A;
1673 indexnoise = (indexnoise + m_max) & 0x1ff;
1674 indexsine = (indexsine + 1) & 3;
1677 ch_data->f_indexnoise = indexnoise;
1678 ch_data->f_indexsine = indexsine;
1681 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1684 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
1686 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1689 if (!sbr->kx_and_m_pushed) {
1690 sbr->kx[0] = sbr->kx[1];
1691 sbr->m[0] = sbr->m[1];
1693 sbr->kx_and_m_pushed = 0;
1697 sbr_dequant(sbr, id_aac);
1699 for (ch = 0; ch < nch; ch++) {
1700 /* decode channel */
1701 sbr_qmf_analysis(&ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1702 (float*)sbr->qmf_filter_scratch,
1703 sbr->data[ch].W, sbr->data[ch].Ypos);
1704 sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W, sbr->data[ch].Ypos);
1705 sbr->data[ch].Ypos ^= 1;
1707 sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1708 sbr_chirp(sbr, &sbr->data[ch]);
1709 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1710 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1711 sbr->data[ch].bs_num_env);
1714 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1716 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1717 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1718 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1719 sbr->X_high, sbr, &sbr->data[ch],
1725 sbr->c.sbr_x_gen(sbr, sbr->X[ch],
1726 sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1727 sbr->data[ch].Y[ sbr->data[ch].Ypos],
1731 if (ac->oc[1].m4ac.ps == 1) {
1732 if (sbr->ps.start) {
1733 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1735 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1740 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
1741 L, sbr->X[0], sbr->qmf_filter_scratch,
1742 sbr->data[0].synthesis_filterbank_samples,
1743 &sbr->data[0].synthesis_filterbank_samples_offset,
1746 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
1747 R, sbr->X[1], sbr->qmf_filter_scratch,
1748 sbr->data[1].synthesis_filterbank_samples,
1749 &sbr->data[1].synthesis_filterbank_samples_offset,
1753 static void aacsbr_func_ptr_init(AACSBRContext *c)
1755 c->sbr_lf_gen = sbr_lf_gen;
1756 c->sbr_hf_assemble = sbr_hf_assemble;
1757 c->sbr_x_gen = sbr_x_gen;
1758 c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;
1761 ff_aacsbr_func_ptr_init_mips(c);