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/libm.h"
37 #include "libavutil/avassert.h"
43 #define ENVELOPE_ADJUSTMENT_OFFSET 2
44 #define NOISE_FLOOR_OFFSET 6.0f
52 T_HUFFMAN_ENV_BAL_1_5DB,
53 F_HUFFMAN_ENV_BAL_1_5DB,
56 T_HUFFMAN_ENV_BAL_3_0DB,
57 F_HUFFMAN_ENV_BAL_3_0DB,
58 T_HUFFMAN_NOISE_3_0DB,
59 T_HUFFMAN_NOISE_BAL_3_0DB,
63 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
76 static VLC vlc_sbr[10];
77 static const int8_t vlc_sbr_lav[10] =
78 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
79 static const DECLARE_ALIGNED(16, float, zero64)[64];
81 #define SBR_INIT_VLC_STATIC(num, size) \
82 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
83 sbr_tmp[num].sbr_bits , 1, 1, \
84 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
87 #define SBR_VLC_ROW(name) \
88 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
90 av_cold void ff_aac_sbr_init(void)
94 const void *sbr_codes, *sbr_bits;
95 const unsigned int table_size, elem_size;
97 SBR_VLC_ROW(t_huffman_env_1_5dB),
98 SBR_VLC_ROW(f_huffman_env_1_5dB),
99 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
100 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
101 SBR_VLC_ROW(t_huffman_env_3_0dB),
102 SBR_VLC_ROW(f_huffman_env_3_0dB),
103 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
104 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
105 SBR_VLC_ROW(t_huffman_noise_3_0dB),
106 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
109 // SBR VLC table initialization
110 SBR_INIT_VLC_STATIC(0, 1098);
111 SBR_INIT_VLC_STATIC(1, 1092);
112 SBR_INIT_VLC_STATIC(2, 768);
113 SBR_INIT_VLC_STATIC(3, 1026);
114 SBR_INIT_VLC_STATIC(4, 1058);
115 SBR_INIT_VLC_STATIC(5, 1052);
116 SBR_INIT_VLC_STATIC(6, 544);
117 SBR_INIT_VLC_STATIC(7, 544);
118 SBR_INIT_VLC_STATIC(8, 592);
119 SBR_INIT_VLC_STATIC(9, 512);
121 for (n = 1; n < 320; n++)
122 sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
123 sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
124 sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
126 for (n = 0; n < 320; n++)
127 sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
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);
160 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
162 ff_mdct_end(&sbr->mdct);
163 ff_mdct_end(&sbr->mdct_ana);
166 static int qsort_comparison_function_int16(const void *a, const void *b)
168 return *(const int16_t *)a - *(const int16_t *)b;
171 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
174 for (i = 0; i <= last_el; i++)
175 if (table[i] == needle)
180 /// Limiter Frequency Band Table (14496-3 sp04 p198)
181 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
184 if (sbr->bs_limiter_bands > 0) {
185 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
186 1.18509277094158210129f, //2^(0.49/2)
187 1.11987160404675912501f }; //2^(0.49/3)
188 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
189 int16_t patch_borders[7];
190 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
192 patch_borders[0] = sbr->kx[1];
193 for (k = 1; k <= sbr->num_patches; k++)
194 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
196 memcpy(sbr->f_tablelim, sbr->f_tablelow,
197 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
198 if (sbr->num_patches > 1)
199 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
200 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
202 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
203 sizeof(sbr->f_tablelim[0]),
204 qsort_comparison_function_int16);
206 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
207 while (out < sbr->f_tablelim + sbr->n_lim) {
208 if (*in >= *out * lim_bands_per_octave_warped) {
210 } else if (*in == *out ||
211 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
214 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
222 sbr->f_tablelim[0] = sbr->f_tablelow[0];
223 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
228 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
230 unsigned int cnt = get_bits_count(gb);
231 uint8_t bs_header_extra_1;
232 uint8_t bs_header_extra_2;
233 int old_bs_limiter_bands = sbr->bs_limiter_bands;
234 SpectrumParameters old_spectrum_params;
238 // Save last spectrum parameters variables to compare to new ones
239 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
241 sbr->bs_amp_res_header = get_bits1(gb);
242 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
243 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
244 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
245 skip_bits(gb, 2); // bs_reserved
247 bs_header_extra_1 = get_bits1(gb);
248 bs_header_extra_2 = get_bits1(gb);
250 if (bs_header_extra_1) {
251 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
252 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
253 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
255 sbr->spectrum_params.bs_freq_scale = 2;
256 sbr->spectrum_params.bs_alter_scale = 1;
257 sbr->spectrum_params.bs_noise_bands = 2;
260 // Check if spectrum parameters changed
261 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
264 if (bs_header_extra_2) {
265 sbr->bs_limiter_bands = get_bits(gb, 2);
266 sbr->bs_limiter_gains = get_bits(gb, 2);
267 sbr->bs_interpol_freq = get_bits1(gb);
268 sbr->bs_smoothing_mode = get_bits1(gb);
270 sbr->bs_limiter_bands = 2;
271 sbr->bs_limiter_gains = 2;
272 sbr->bs_interpol_freq = 1;
273 sbr->bs_smoothing_mode = 1;
276 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
277 sbr_make_f_tablelim(sbr);
279 return get_bits_count(gb) - cnt;
282 static int array_min_int16(const int16_t *array, int nel)
284 int i, min = array[0];
285 for (i = 1; i < nel; i++)
286 min = FFMIN(array[i], min);
290 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
292 int k, previous, present;
295 base = powf((float)stop / start, 1.0f / num_bands);
299 for (k = 0; k < num_bands-1; k++) {
301 present = lrintf(prod);
302 bands[k] = present - previous;
305 bands[num_bands-1] = stop - previous;
308 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
310 // Requirements (14496-3 sp04 p205)
312 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
315 if (bs_xover_band >= n_master) {
316 av_log(avctx, AV_LOG_ERROR,
317 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
324 /// Master Frequency Band Table (14496-3 sp04 p194)
325 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
326 SpectrumParameters *spectrum)
328 unsigned int temp, max_qmf_subbands;
329 unsigned int start_min, stop_min;
331 const int8_t *sbr_offset_ptr;
334 if (sbr->sample_rate < 32000) {
336 } else if (sbr->sample_rate < 64000) {
341 switch (sbr->sample_rate) {
343 sbr_offset_ptr = sbr_offset[0];
346 sbr_offset_ptr = sbr_offset[1];
349 sbr_offset_ptr = sbr_offset[2];
352 sbr_offset_ptr = sbr_offset[3];
354 case 44100: case 48000: case 64000:
355 sbr_offset_ptr = sbr_offset[4];
357 case 88200: case 96000: case 128000: case 176400: case 192000:
358 sbr_offset_ptr = sbr_offset[5];
361 av_log(ac->avctx, AV_LOG_ERROR,
362 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
366 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
367 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
369 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
371 if (spectrum->bs_stop_freq < 14) {
372 sbr->k[2] = stop_min;
373 make_bands(stop_dk, stop_min, 64, 13);
374 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
375 for (k = 0; k < spectrum->bs_stop_freq; k++)
376 sbr->k[2] += stop_dk[k];
377 } else if (spectrum->bs_stop_freq == 14) {
378 sbr->k[2] = 2*sbr->k[0];
379 } else if (spectrum->bs_stop_freq == 15) {
380 sbr->k[2] = 3*sbr->k[0];
382 av_log(ac->avctx, AV_LOG_ERROR,
383 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
386 sbr->k[2] = FFMIN(64, sbr->k[2]);
388 // Requirements (14496-3 sp04 p205)
389 if (sbr->sample_rate <= 32000) {
390 max_qmf_subbands = 48;
391 } else if (sbr->sample_rate == 44100) {
392 max_qmf_subbands = 35;
393 } else if (sbr->sample_rate >= 48000)
394 max_qmf_subbands = 32;
396 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
397 av_log(ac->avctx, AV_LOG_ERROR,
398 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
402 if (!spectrum->bs_freq_scale) {
405 dk = spectrum->bs_alter_scale + 1;
406 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
407 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
410 for (k = 1; k <= sbr->n_master; k++)
411 sbr->f_master[k] = dk;
413 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
416 sbr->f_master[2]-= (k2diff < -1);
418 sbr->f_master[sbr->n_master]++;
421 sbr->f_master[0] = sbr->k[0];
422 for (k = 1; k <= sbr->n_master; k++)
423 sbr->f_master[k] += sbr->f_master[k - 1];
426 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
427 int two_regions, num_bands_0;
428 int vdk0_max, vdk1_min;
431 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
433 sbr->k[1] = 2 * sbr->k[0];
436 sbr->k[1] = sbr->k[2];
439 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
441 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
442 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
448 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
450 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
451 vdk0_max = vk0[num_bands_0];
454 for (k = 1; k <= num_bands_0; k++) {
455 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
456 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
464 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
465 : 1.0f; // bs_alter_scale = {0,1}
466 int num_bands_1 = lrintf(half_bands * invwarp *
467 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
469 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
471 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
473 if (vdk1_min < vdk0_max) {
475 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
476 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
478 vk1[num_bands_1] -= change;
481 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
484 for (k = 1; k <= num_bands_1; k++) {
485 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
486 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
492 sbr->n_master = num_bands_0 + num_bands_1;
493 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
495 memcpy(&sbr->f_master[0], vk0,
496 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
497 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
498 num_bands_1 * sizeof(sbr->f_master[0]));
501 sbr->n_master = num_bands_0;
502 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
504 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
511 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
512 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
516 int usb = sbr->kx[1];
517 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
519 sbr->num_patches = 0;
521 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
522 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
528 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
529 sb = sbr->f_master[i];
530 odd = (sb + sbr->k[0]) & 1;
533 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
534 // After this check the final number of patches can still be six which is
535 // illegal however the Coding Technologies decoder check stream has a final
536 // count of 6 patches
537 if (sbr->num_patches > 5) {
538 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
542 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
543 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
545 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
552 if (sbr->f_master[k] - sb < 3)
554 } while (sb != sbr->kx[1] + sbr->m[1]);
556 if (sbr->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches-1] < 3)
562 /// Derived Frequency Band Tables (14496-3 sp04 p197)
563 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
567 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
568 sbr->n[0] = (sbr->n[1] + 1) >> 1;
570 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
571 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
572 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
573 sbr->kx[1] = sbr->f_tablehigh[0];
575 // Requirements (14496-3 sp04 p205)
576 if (sbr->kx[1] + sbr->m[1] > 64) {
577 av_log(ac->avctx, AV_LOG_ERROR,
578 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
581 if (sbr->kx[1] > 32) {
582 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
586 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
587 temp = sbr->n[1] & 1;
588 for (k = 1; k <= sbr->n[0]; k++)
589 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
591 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
592 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
594 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
598 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
600 for (k = 1; k <= sbr->n_q; k++) {
601 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
602 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
605 if (sbr_hf_calc_npatches(ac, sbr) < 0)
608 sbr_make_f_tablelim(sbr);
610 sbr->data[0].f_indexnoise = 0;
611 sbr->data[1].f_indexnoise = 0;
616 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
620 for (i = 0; i < elements; i++) {
621 vec[i] = get_bits1(gb);
625 /** ceil(log2(index+1)) */
626 static const int8_t ceil_log2[] = {
630 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
631 GetBitContext *gb, SBRData *ch_data)
634 unsigned bs_pointer = 0;
635 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
636 int abs_bord_trail = 16;
637 int num_rel_lead, num_rel_trail;
638 unsigned bs_num_env_old = ch_data->bs_num_env;
640 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
641 ch_data->bs_amp_res = sbr->bs_amp_res_header;
642 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
644 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
646 ch_data->bs_num_env = 1 << get_bits(gb, 2);
647 num_rel_lead = ch_data->bs_num_env - 1;
648 if (ch_data->bs_num_env == 1)
649 ch_data->bs_amp_res = 0;
651 if (ch_data->bs_num_env > 4) {
652 av_log(ac->avctx, AV_LOG_ERROR,
653 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
654 ch_data->bs_num_env);
658 ch_data->t_env[0] = 0;
659 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
661 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
663 for (i = 0; i < num_rel_lead; i++)
664 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
666 ch_data->bs_freq_res[1] = get_bits1(gb);
667 for (i = 1; i < ch_data->bs_num_env; i++)
668 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
671 abs_bord_trail += get_bits(gb, 2);
672 num_rel_trail = get_bits(gb, 2);
673 ch_data->bs_num_env = num_rel_trail + 1;
674 ch_data->t_env[0] = 0;
675 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
677 for (i = 0; i < num_rel_trail; i++)
678 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
679 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
681 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
683 for (i = 0; i < ch_data->bs_num_env; i++)
684 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
687 ch_data->t_env[0] = get_bits(gb, 2);
688 num_rel_lead = get_bits(gb, 2);
689 ch_data->bs_num_env = num_rel_lead + 1;
690 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
692 for (i = 0; i < num_rel_lead; i++)
693 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
695 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
697 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
700 ch_data->t_env[0] = get_bits(gb, 2);
701 abs_bord_trail += get_bits(gb, 2);
702 num_rel_lead = get_bits(gb, 2);
703 num_rel_trail = get_bits(gb, 2);
704 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
706 if (ch_data->bs_num_env > 5) {
707 av_log(ac->avctx, AV_LOG_ERROR,
708 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
709 ch_data->bs_num_env);
713 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
715 for (i = 0; i < num_rel_lead; i++)
716 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
717 for (i = 0; i < num_rel_trail; i++)
718 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
719 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
721 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
723 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
727 if (bs_pointer > ch_data->bs_num_env + 1) {
728 av_log(ac->avctx, AV_LOG_ERROR,
729 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
734 for (i = 1; i <= ch_data->bs_num_env; i++) {
735 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
736 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
741 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
743 ch_data->t_q[0] = ch_data->t_env[0];
744 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
745 if (ch_data->bs_num_noise > 1) {
747 if (ch_data->bs_frame_class == FIXFIX) {
748 idx = ch_data->bs_num_env >> 1;
749 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
750 idx = ch_data->bs_num_env - FFMAX((int)bs_pointer - 1, 1);
754 else if (bs_pointer == 1)
755 idx = ch_data->bs_num_env - 1;
756 else // bs_pointer > 1
757 idx = bs_pointer - 1;
759 ch_data->t_q[1] = ch_data->t_env[idx];
762 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
763 ch_data->e_a[1] = -1;
764 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
765 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
766 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
767 ch_data->e_a[1] = bs_pointer - 1;
772 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
773 //These variables are saved from the previous frame rather than copied
774 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
775 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
776 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
778 //These variables are read from the bitstream and therefore copied
779 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
780 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
781 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
782 dst->bs_num_env = src->bs_num_env;
783 dst->bs_amp_res = src->bs_amp_res;
784 dst->bs_num_noise = src->bs_num_noise;
785 dst->bs_frame_class = src->bs_frame_class;
786 dst->e_a[1] = src->e_a[1];
789 /// Read how the envelope and noise floor data is delta coded
790 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
793 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
794 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
797 /// Read inverse filtering data
798 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
803 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
804 for (i = 0; i < sbr->n_q; i++)
805 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
808 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
809 SBRData *ch_data, int ch)
813 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
815 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
816 const int odd = sbr->n[1] & 1;
818 if (sbr->bs_coupling && ch) {
819 if (ch_data->bs_amp_res) {
821 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
822 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
823 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
824 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
827 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
828 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
829 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
830 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
833 if (ch_data->bs_amp_res) {
835 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
836 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
837 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
838 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
841 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
842 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
843 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
844 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
848 for (i = 0; i < ch_data->bs_num_env; i++) {
849 if (ch_data->bs_df_env[i]) {
850 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
851 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
852 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
853 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
854 } else if (ch_data->bs_freq_res[i + 1]) {
855 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
856 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
857 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
860 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
861 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
862 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
866 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
867 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
868 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
872 //assign 0th elements of env_facs from last elements
873 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
874 sizeof(ch_data->env_facs[0]));
877 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
878 SBRData *ch_data, int ch)
881 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
883 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
885 if (sbr->bs_coupling && ch) {
886 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
887 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
888 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
889 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
891 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
892 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
893 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
894 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
897 for (i = 0; i < ch_data->bs_num_noise; i++) {
898 if (ch_data->bs_df_noise[i]) {
899 for (j = 0; j < sbr->n_q; j++)
900 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
902 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
903 for (j = 1; j < sbr->n_q; j++)
904 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
908 //assign 0th elements of noise_facs from last elements
909 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
910 sizeof(ch_data->noise_facs[0]));
913 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
915 int bs_extension_id, int *num_bits_left)
917 switch (bs_extension_id) {
918 case EXTENSION_ID_PS:
919 if (!ac->oc[1].m4ac.ps) {
920 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
921 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
925 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
927 av_log_missing_feature(ac->avctx, "Parametric Stereo", 0);
928 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
934 // some files contain 0-padding
935 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
936 av_log_missing_feature(ac->avctx, "Reserved SBR extensions", 1);
937 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
943 static int read_sbr_single_channel_element(AACContext *ac,
944 SpectralBandReplication *sbr,
947 if (get_bits1(gb)) // bs_data_extra
948 skip_bits(gb, 4); // bs_reserved
950 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
952 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
953 read_sbr_invf(sbr, gb, &sbr->data[0]);
954 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
955 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
957 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
958 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
963 static int read_sbr_channel_pair_element(AACContext *ac,
964 SpectralBandReplication *sbr,
967 if (get_bits1(gb)) // bs_data_extra
968 skip_bits(gb, 8); // bs_reserved
970 if ((sbr->bs_coupling = get_bits1(gb))) {
971 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
973 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
974 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
975 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
976 read_sbr_invf(sbr, gb, &sbr->data[0]);
977 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
978 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
979 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
980 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
981 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
982 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
984 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
985 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
987 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
988 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
989 read_sbr_invf(sbr, gb, &sbr->data[0]);
990 read_sbr_invf(sbr, gb, &sbr->data[1]);
991 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
992 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
993 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
994 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
997 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
998 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
999 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
1000 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
1005 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
1006 GetBitContext *gb, int id_aac)
1008 unsigned int cnt = get_bits_count(gb);
1010 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
1011 if (read_sbr_single_channel_element(ac, sbr, gb)) {
1013 return get_bits_count(gb) - cnt;
1015 } else if (id_aac == TYPE_CPE) {
1016 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1018 return get_bits_count(gb) - cnt;
1021 av_log(ac->avctx, AV_LOG_ERROR,
1022 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1024 return get_bits_count(gb) - cnt;
1026 if (get_bits1(gb)) { // bs_extended_data
1027 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1028 if (num_bits_left == 15)
1029 num_bits_left += get_bits(gb, 8); // bs_esc_count
1031 num_bits_left <<= 3;
1032 while (num_bits_left > 7) {
1034 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1036 if (num_bits_left < 0) {
1037 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1039 if (num_bits_left > 0)
1040 skip_bits(gb, num_bits_left);
1043 return get_bits_count(gb) - cnt;
1046 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1049 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1051 err = sbr_make_f_derived(ac, sbr);
1053 av_log(ac->avctx, AV_LOG_ERROR,
1054 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1060 * Decode Spectral Band Replication extension data; reference: table 4.55.
1062 * @param crc flag indicating the presence of CRC checksum
1063 * @param cnt length of TYPE_FIL syntactic element in bytes
1065 * @return Returns number of bytes consumed from the TYPE_FIL element.
1067 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1068 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1070 unsigned int num_sbr_bits = 0, num_align_bits;
1071 unsigned bytes_read;
1072 GetBitContext gbc = *gb_host, *gb = &gbc;
1073 skip_bits_long(gb_host, cnt*8 - 4);
1077 if (!sbr->sample_rate)
1078 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1079 if (!ac->oc[1].m4ac.ext_sample_rate)
1080 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
1083 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1087 //Save some state from the previous frame.
1088 sbr->kx[0] = sbr->kx[1];
1089 sbr->m[0] = sbr->m[1];
1090 sbr->kx_and_m_pushed = 1;
1093 if (get_bits1(gb)) // bs_header_flag
1094 num_sbr_bits += read_sbr_header(sbr, gb);
1100 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1102 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1103 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1105 if (bytes_read > cnt) {
1106 av_log(ac->avctx, AV_LOG_ERROR,
1107 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1112 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1113 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1118 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1119 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1120 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1121 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1122 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1123 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1124 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1125 float fac = temp1 / (1.0f + temp2);
1126 sbr->data[0].env_facs[e][k] = fac;
1127 sbr->data[1].env_facs[e][k] = fac * temp2;
1130 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1131 for (k = 0; k < sbr->n_q; k++) {
1132 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1133 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1134 float fac = temp1 / (1.0f + temp2);
1135 sbr->data[0].noise_facs[e][k] = fac;
1136 sbr->data[1].noise_facs[e][k] = fac * temp2;
1139 } else { // SCE or one non-coupled CPE
1140 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1141 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1142 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1143 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1144 sbr->data[ch].env_facs[e][k] =
1145 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1146 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1147 for (k = 0; k < sbr->n_q; k++)
1148 sbr->data[ch].noise_facs[e][k] =
1149 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1155 * Analysis QMF Bank (14496-3 sp04 p206)
1157 * @param x pointer to the beginning of the first sample window
1158 * @param W array of complex-valued samples split into subbands
1160 static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct,
1161 SBRDSPContext *sbrdsp, const float *in, float *x,
1162 float z[320], float W[2][32][32][2], int buf_idx)
1165 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1166 memcpy(x+288, in, 1024*sizeof(x[0]));
1167 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1168 // are not supported
1169 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1171 sbrdsp->qmf_pre_shuffle(z);
1172 mdct->imdct_half(mdct, z, z+64);
1173 sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
1179 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1180 * (14496-3 sp04 p206)
1182 static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1183 SBRDSPContext *sbrdsp,
1184 float *out, float X[2][38][64],
1185 float mdct_buf[2][64],
1186 float *v0, int *v_off, const unsigned int div)
1189 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1190 const int step = 128 >> div;
1192 for (i = 0; i < 32; i++) {
1193 if (*v_off < step) {
1194 int saved_samples = (1280 - 128) >> div;
1195 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1196 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1202 for (n = 0; n < 32; n++) {
1203 X[0][i][ n] = -X[0][i][n];
1204 X[0][i][32+n] = X[1][i][31-n];
1206 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1207 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1209 sbrdsp->neg_odd_64(X[1][i]);
1210 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1211 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1212 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1214 dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1215 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1216 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1217 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1218 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1219 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1220 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1221 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1222 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1223 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1228 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1229 * (14496-3 sp04 p214)
1230 * Warning: This routine does not seem numerically stable.
1232 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
1233 float (*alpha0)[2], float (*alpha1)[2],
1234 const float X_low[32][40][2], int k0)
1237 for (k = 0; k < k0; k++) {
1238 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
1241 dsp->autocorrelate(X_low[k], phi);
1243 dk = phi[2][1][0] * phi[1][0][0] -
1244 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1250 float temp_real, temp_im;
1251 temp_real = phi[0][0][0] * phi[1][1][0] -
1252 phi[0][0][1] * phi[1][1][1] -
1253 phi[0][1][0] * phi[1][0][0];
1254 temp_im = phi[0][0][0] * phi[1][1][1] +
1255 phi[0][0][1] * phi[1][1][0] -
1256 phi[0][1][1] * phi[1][0][0];
1258 alpha1[k][0] = temp_real / dk;
1259 alpha1[k][1] = temp_im / dk;
1262 if (!phi[1][0][0]) {
1266 float temp_real, temp_im;
1267 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1268 alpha1[k][1] * phi[1][1][1];
1269 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1270 alpha1[k][0] * phi[1][1][1];
1272 alpha0[k][0] = -temp_real / phi[1][0][0];
1273 alpha0[k][1] = -temp_im / phi[1][0][0];
1276 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1277 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1286 /// Chirp Factors (14496-3 sp04 p214)
1287 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1291 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1293 for (i = 0; i < sbr->n_q; i++) {
1294 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1297 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1299 if (new_bw < ch_data->bw_array[i]) {
1300 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1302 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1303 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1307 /// Generate the subband filtered lowband
1308 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1309 float X_low[32][40][2], const float W[2][32][32][2],
1313 const int t_HFGen = 8;
1315 memset(X_low, 0, 32*sizeof(*X_low));
1316 for (k = 0; k < sbr->kx[1]; k++) {
1317 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1318 X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
1319 X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
1322 buf_idx = 1-buf_idx;
1323 for (k = 0; k < sbr->kx[0]; k++) {
1324 for (i = 0; i < t_HFGen; i++) {
1325 X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
1326 X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
1332 /// High Frequency Generator (14496-3 sp04 p215)
1333 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1334 float X_high[64][40][2], const float X_low[32][40][2],
1335 const float (*alpha0)[2], const float (*alpha1)[2],
1336 const float bw_array[5], const uint8_t *t_env,
1342 for (j = 0; j < sbr->num_patches; j++) {
1343 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1344 const int p = sbr->patch_start_subband[j] + x;
1345 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1350 av_log(ac->avctx, AV_LOG_ERROR,
1351 "ERROR : no subband found for frequency %d\n", k);
1355 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1356 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1357 alpha0[p], alpha1[p], bw_array[g],
1358 2 * t_env[0], 2 * t_env[bs_num_env]);
1361 if (k < sbr->m[1] + sbr->kx[1])
1362 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1367 /// Generate the subband filtered lowband
1368 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1369 const float Y0[38][64][2], const float Y1[38][64][2],
1370 const float X_low[32][40][2], int ch)
1374 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1375 memset(X, 0, 2*sizeof(*X));
1376 for (k = 0; k < sbr->kx[0]; k++) {
1377 for (i = 0; i < i_Temp; i++) {
1378 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1379 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1382 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1383 for (i = 0; i < i_Temp; i++) {
1384 X[0][i][k] = Y0[i + i_f][k][0];
1385 X[1][i][k] = Y0[i + i_f][k][1];
1389 for (k = 0; k < sbr->kx[1]; k++) {
1390 for (i = i_Temp; i < 38; i++) {
1391 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1392 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1395 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1396 for (i = i_Temp; i < i_f; i++) {
1397 X[0][i][k] = Y1[i][k][0];
1398 X[1][i][k] = Y1[i][k][1];
1404 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1405 * (14496-3 sp04 p217)
1407 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1408 SBRData *ch_data, int e_a[2])
1412 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1413 for (e = 0; e < ch_data->bs_num_env; e++) {
1414 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1415 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1418 if (sbr->kx[1] != table[0]) {
1419 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
1420 "Derived frequency tables were not regenerated.\n");
1424 for (i = 0; i < ilim; i++)
1425 for (m = table[i]; m < table[i + 1]; m++)
1426 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1428 // ch_data->bs_num_noise > 1 => 2 noise floors
1429 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1430 for (i = 0; i < sbr->n_q; i++)
1431 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1432 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1434 for (i = 0; i < sbr->n[1]; i++) {
1435 if (ch_data->bs_add_harmonic_flag) {
1436 const unsigned int m_midpoint =
1437 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1439 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1440 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1444 for (i = 0; i < ilim; i++) {
1445 int additional_sinusoid_present = 0;
1446 for (m = table[i]; m < table[i + 1]; m++) {
1447 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1448 additional_sinusoid_present = 1;
1452 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1453 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1457 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1461 /// Estimation of current envelope (14496-3 sp04 p218)
1462 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1463 SpectralBandReplication *sbr, SBRData *ch_data)
1466 int kx1 = sbr->kx[1];
1468 if (sbr->bs_interpol_freq) {
1469 for (e = 0; e < ch_data->bs_num_env; e++) {
1470 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1471 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1472 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1474 for (m = 0; m < sbr->m[1]; m++) {
1475 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1476 e_curr[e][m] = sum * recip_env_size;
1482 for (e = 0; e < ch_data->bs_num_env; e++) {
1483 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1484 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1485 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1486 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1488 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1490 const int den = env_size * (table[p + 1] - table[p]);
1492 for (k = table[p]; k < table[p + 1]; k++) {
1493 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1496 for (k = table[p]; k < table[p + 1]; k++) {
1497 e_curr[e][k - kx1] = sum;
1505 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1506 * and Calculation of gain (14496-3 sp04 p219)
1508 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1509 SBRData *ch_data, const int e_a[2])
1512 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1513 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1515 for (e = 0; e < ch_data->bs_num_env; e++) {
1516 int delta = !((e == e_a[1]) || (e == e_a[0]));
1517 for (k = 0; k < sbr->n_lim; k++) {
1518 float gain_boost, gain_max;
1519 float sum[2] = { 0.0f, 0.0f };
1520 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1521 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1522 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1523 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1524 if (!sbr->s_mapped[e][m]) {
1525 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1526 ((1.0f + sbr->e_curr[e][m]) *
1527 (1.0f + sbr->q_mapped[e][m] * delta)));
1529 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1530 ((1.0f + sbr->e_curr[e][m]) *
1531 (1.0f + sbr->q_mapped[e][m])));
1534 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1535 sum[0] += sbr->e_origmapped[e][m];
1536 sum[1] += sbr->e_curr[e][m];
1538 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1539 gain_max = FFMIN(100000.f, gain_max);
1540 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1541 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1542 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1543 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1545 sum[0] = sum[1] = 0.0f;
1546 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1547 sum[0] += sbr->e_origmapped[e][m];
1548 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1549 + sbr->s_m[e][m] * sbr->s_m[e][m]
1550 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1552 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1553 gain_boost = FFMIN(1.584893192f, gain_boost);
1554 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1555 sbr->gain[e][m] *= gain_boost;
1556 sbr->q_m[e][m] *= gain_boost;
1557 sbr->s_m[e][m] *= gain_boost;
1563 /// Assembling HF Signals (14496-3 sp04 p220)
1564 static void sbr_hf_assemble(float Y1[38][64][2],
1565 const float X_high[64][40][2],
1566 SpectralBandReplication *sbr, SBRData *ch_data,
1570 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1571 const int kx = sbr->kx[1];
1572 const int m_max = sbr->m[1];
1573 static const float h_smooth[5] = {
1580 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1581 int indexnoise = ch_data->f_indexnoise;
1582 int indexsine = ch_data->f_indexsine;
1585 for (i = 0; i < h_SL; i++) {
1586 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1587 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1590 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1591 memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1594 for (e = 0; e < ch_data->bs_num_env; e++) {
1595 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1596 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1597 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1601 for (e = 0; e < ch_data->bs_num_env; e++) {
1602 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1603 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
1604 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
1605 float *g_filt, *q_filt;
1607 if (h_SL && e != e_a[0] && e != e_a[1]) {
1608 g_filt = g_filt_tab;
1609 q_filt = q_filt_tab;
1610 for (m = 0; m < m_max; m++) {
1611 const int idx1 = i + h_SL;
1614 for (j = 0; j <= h_SL; j++) {
1615 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
1616 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
1620 g_filt = g_temp[i + h_SL];
1624 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
1625 i + ENVELOPE_ADJUSTMENT_OFFSET);
1627 if (e != e_a[0] && e != e_a[1]) {
1628 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
1632 int idx = indexsine&1;
1633 int A = (1-((indexsine+(kx & 1))&2));
1634 int B = (A^(-idx)) + idx;
1635 float *out = &Y1[i][kx][idx];
1636 float *in = sbr->s_m[e];
1637 for (m = 0; m+1 < m_max; m+=2) {
1638 out[2*m ] += in[m ] * A;
1639 out[2*m+2] += in[m+1] * B;
1642 out[2*m ] += in[m ] * A;
1644 indexnoise = (indexnoise + m_max) & 0x1ff;
1645 indexsine = (indexsine + 1) & 3;
1648 ch_data->f_indexnoise = indexnoise;
1649 ch_data->f_indexsine = indexsine;
1652 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1655 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
1657 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1660 if (!sbr->kx_and_m_pushed) {
1661 sbr->kx[0] = sbr->kx[1];
1662 sbr->m[0] = sbr->m[1];
1664 sbr->kx_and_m_pushed = 0;
1668 sbr_dequant(sbr, id_aac);
1670 for (ch = 0; ch < nch; ch++) {
1671 /* decode channel */
1672 sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1673 (float*)sbr->qmf_filter_scratch,
1674 sbr->data[ch].W, sbr->data[ch].Ypos);
1675 sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W, sbr->data[ch].Ypos);
1676 sbr->data[ch].Ypos ^= 1;
1678 sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1679 sbr_chirp(sbr, &sbr->data[ch]);
1680 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1681 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1682 sbr->data[ch].bs_num_env);
1685 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1687 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1688 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1689 sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1690 sbr->X_high, sbr, &sbr->data[ch],
1696 sbr_x_gen(sbr, sbr->X[ch],
1697 sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1698 sbr->data[ch].Y[ sbr->data[ch].Ypos],
1702 if (ac->oc[1].m4ac.ps == 1) {
1703 if (sbr->ps.start) {
1704 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1706 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1711 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, &sbr->dsp, L, sbr->X[0], sbr->qmf_filter_scratch,
1712 sbr->data[0].synthesis_filterbank_samples,
1713 &sbr->data[0].synthesis_filterbank_samples_offset,
1716 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, &sbr->dsp, R, sbr->X[1], sbr->qmf_filter_scratch,
1717 sbr->data[1].synthesis_filterbank_samples,
1718 &sbr->data[1].synthesis_filterbank_samples_offset,