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 Libav.
8 * Libav 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
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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 Libav; 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"
41 #define ENVELOPE_ADJUSTMENT_OFFSET 2
42 #define NOISE_FLOOR_OFFSET 6.0f
50 T_HUFFMAN_ENV_BAL_1_5DB,
51 F_HUFFMAN_ENV_BAL_1_5DB,
54 T_HUFFMAN_ENV_BAL_3_0DB,
55 F_HUFFMAN_ENV_BAL_3_0DB,
56 T_HUFFMAN_NOISE_3_0DB,
57 T_HUFFMAN_NOISE_BAL_3_0DB,
61 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
74 static VLC vlc_sbr[10];
75 static const int8_t vlc_sbr_lav[10] =
76 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
77 static const DECLARE_ALIGNED(16, float, zero64)[64];
79 #define SBR_INIT_VLC_STATIC(num, size) \
80 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
81 sbr_tmp[num].sbr_bits , 1, 1, \
82 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
85 #define SBR_VLC_ROW(name) \
86 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
88 av_cold void ff_aac_sbr_init(void)
92 const void *sbr_codes, *sbr_bits;
93 const unsigned int table_size, elem_size;
95 SBR_VLC_ROW(t_huffman_env_1_5dB),
96 SBR_VLC_ROW(f_huffman_env_1_5dB),
97 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
98 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
99 SBR_VLC_ROW(t_huffman_env_3_0dB),
100 SBR_VLC_ROW(f_huffman_env_3_0dB),
101 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
102 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
103 SBR_VLC_ROW(t_huffman_noise_3_0dB),
104 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
107 // SBR VLC table initialization
108 SBR_INIT_VLC_STATIC(0, 1098);
109 SBR_INIT_VLC_STATIC(1, 1092);
110 SBR_INIT_VLC_STATIC(2, 768);
111 SBR_INIT_VLC_STATIC(3, 1026);
112 SBR_INIT_VLC_STATIC(4, 1058);
113 SBR_INIT_VLC_STATIC(5, 1052);
114 SBR_INIT_VLC_STATIC(6, 544);
115 SBR_INIT_VLC_STATIC(7, 544);
116 SBR_INIT_VLC_STATIC(8, 592);
117 SBR_INIT_VLC_STATIC(9, 512);
119 for (n = 1; n < 320; n++)
120 sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
121 sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
122 sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
124 for (n = 0; n < 320; n++)
125 sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
130 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
133 sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
134 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
135 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
136 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
137 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
138 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
139 * and scale back down at synthesis. */
140 mdct_scale = ac->avctx->sample_fmt == AV_SAMPLE_FMT_FLT ? 32768.0f : 1.0f;
141 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * mdct_scale));
142 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * mdct_scale);
143 ff_ps_ctx_init(&sbr->ps);
144 ff_sbrdsp_init(&sbr->dsp);
147 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
149 ff_mdct_end(&sbr->mdct);
150 ff_mdct_end(&sbr->mdct_ana);
153 static int qsort_comparison_function_int16(const void *a, const void *b)
155 return *(const int16_t *)a - *(const int16_t *)b;
158 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
161 for (i = 0; i <= last_el; i++)
162 if (table[i] == needle)
167 /// Limiter Frequency Band Table (14496-3 sp04 p198)
168 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
171 if (sbr->bs_limiter_bands > 0) {
172 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
173 1.18509277094158210129f, //2^(0.49/2)
174 1.11987160404675912501f }; //2^(0.49/3)
175 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
176 int16_t patch_borders[7];
177 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
179 patch_borders[0] = sbr->kx[1];
180 for (k = 1; k <= sbr->num_patches; k++)
181 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
183 memcpy(sbr->f_tablelim, sbr->f_tablelow,
184 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
185 if (sbr->num_patches > 1)
186 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
187 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
189 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
190 sizeof(sbr->f_tablelim[0]),
191 qsort_comparison_function_int16);
193 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
194 while (out < sbr->f_tablelim + sbr->n_lim) {
195 if (*in >= *out * lim_bands_per_octave_warped) {
197 } else if (*in == *out ||
198 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
201 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
209 sbr->f_tablelim[0] = sbr->f_tablelow[0];
210 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
215 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
217 unsigned int cnt = get_bits_count(gb);
218 uint8_t bs_header_extra_1;
219 uint8_t bs_header_extra_2;
220 int old_bs_limiter_bands = sbr->bs_limiter_bands;
221 SpectrumParameters old_spectrum_params;
225 // Save last spectrum parameters variables to compare to new ones
226 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
228 sbr->bs_amp_res_header = get_bits1(gb);
229 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
230 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
231 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
232 skip_bits(gb, 2); // bs_reserved
234 bs_header_extra_1 = get_bits1(gb);
235 bs_header_extra_2 = get_bits1(gb);
237 if (bs_header_extra_1) {
238 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
239 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
240 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
242 sbr->spectrum_params.bs_freq_scale = 2;
243 sbr->spectrum_params.bs_alter_scale = 1;
244 sbr->spectrum_params.bs_noise_bands = 2;
247 // Check if spectrum parameters changed
248 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
251 if (bs_header_extra_2) {
252 sbr->bs_limiter_bands = get_bits(gb, 2);
253 sbr->bs_limiter_gains = get_bits(gb, 2);
254 sbr->bs_interpol_freq = get_bits1(gb);
255 sbr->bs_smoothing_mode = get_bits1(gb);
257 sbr->bs_limiter_bands = 2;
258 sbr->bs_limiter_gains = 2;
259 sbr->bs_interpol_freq = 1;
260 sbr->bs_smoothing_mode = 1;
263 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
264 sbr_make_f_tablelim(sbr);
266 return get_bits_count(gb) - cnt;
269 static int array_min_int16(const int16_t *array, int nel)
271 int i, min = array[0];
272 for (i = 1; i < nel; i++)
273 min = FFMIN(array[i], min);
277 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
279 int k, previous, present;
282 base = powf((float)stop / start, 1.0f / num_bands);
286 for (k = 0; k < num_bands-1; k++) {
288 present = lrintf(prod);
289 bands[k] = present - previous;
292 bands[num_bands-1] = stop - previous;
295 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
297 // Requirements (14496-3 sp04 p205)
299 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
302 if (bs_xover_band >= n_master) {
303 av_log(avctx, AV_LOG_ERROR,
304 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
311 /// Master Frequency Band Table (14496-3 sp04 p194)
312 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
313 SpectrumParameters *spectrum)
315 unsigned int temp, max_qmf_subbands;
316 unsigned int start_min, stop_min;
318 const int8_t *sbr_offset_ptr;
321 if (sbr->sample_rate < 32000) {
323 } else if (sbr->sample_rate < 64000) {
328 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
329 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
331 switch (sbr->sample_rate) {
333 sbr_offset_ptr = sbr_offset[0];
336 sbr_offset_ptr = sbr_offset[1];
339 sbr_offset_ptr = sbr_offset[2];
342 sbr_offset_ptr = sbr_offset[3];
344 case 44100: case 48000: case 64000:
345 sbr_offset_ptr = sbr_offset[4];
347 case 88200: case 96000: case 128000: case 176400: case 192000:
348 sbr_offset_ptr = sbr_offset[5];
351 av_log(ac->avctx, AV_LOG_ERROR,
352 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
356 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
358 if (spectrum->bs_stop_freq < 14) {
359 sbr->k[2] = stop_min;
360 make_bands(stop_dk, stop_min, 64, 13);
361 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
362 for (k = 0; k < spectrum->bs_stop_freq; k++)
363 sbr->k[2] += stop_dk[k];
364 } else if (spectrum->bs_stop_freq == 14) {
365 sbr->k[2] = 2*sbr->k[0];
366 } else if (spectrum->bs_stop_freq == 15) {
367 sbr->k[2] = 3*sbr->k[0];
369 av_log(ac->avctx, AV_LOG_ERROR,
370 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
373 sbr->k[2] = FFMIN(64, sbr->k[2]);
375 // Requirements (14496-3 sp04 p205)
376 if (sbr->sample_rate <= 32000) {
377 max_qmf_subbands = 48;
378 } else if (sbr->sample_rate == 44100) {
379 max_qmf_subbands = 35;
380 } else if (sbr->sample_rate >= 48000)
381 max_qmf_subbands = 32;
383 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
384 av_log(ac->avctx, AV_LOG_ERROR,
385 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
389 if (!spectrum->bs_freq_scale) {
392 dk = spectrum->bs_alter_scale + 1;
393 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
394 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
397 for (k = 1; k <= sbr->n_master; k++)
398 sbr->f_master[k] = dk;
400 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
403 sbr->f_master[2]-= (k2diff < -1);
405 sbr->f_master[sbr->n_master]++;
408 sbr->f_master[0] = sbr->k[0];
409 for (k = 1; k <= sbr->n_master; k++)
410 sbr->f_master[k] += sbr->f_master[k - 1];
413 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
414 int two_regions, num_bands_0;
415 int vdk0_max, vdk1_min;
418 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
420 sbr->k[1] = 2 * sbr->k[0];
423 sbr->k[1] = sbr->k[2];
426 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
428 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
429 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
435 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
437 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
438 vdk0_max = vk0[num_bands_0];
441 for (k = 1; k <= num_bands_0; k++) {
442 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
443 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
451 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
452 : 1.0f; // bs_alter_scale = {0,1}
453 int num_bands_1 = lrintf(half_bands * invwarp *
454 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
456 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
458 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
460 if (vdk1_min < vdk0_max) {
462 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
463 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
465 vk1[num_bands_1] -= change;
468 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
471 for (k = 1; k <= num_bands_1; k++) {
472 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
473 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
479 sbr->n_master = num_bands_0 + num_bands_1;
480 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
482 memcpy(&sbr->f_master[0], vk0,
483 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
484 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
485 num_bands_1 * sizeof(sbr->f_master[0]));
488 sbr->n_master = num_bands_0;
489 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
491 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
498 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
499 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
503 int usb = sbr->kx[1];
504 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
506 sbr->num_patches = 0;
508 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
509 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
515 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
516 sb = sbr->f_master[i];
517 odd = (sb + sbr->k[0]) & 1;
520 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
521 // After this check the final number of patches can still be six which is
522 // illegal however the Coding Technologies decoder check stream has a final
523 // count of 6 patches
524 if (sbr->num_patches > 5) {
525 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
529 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
530 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
532 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
539 if (sbr->f_master[k] - sb < 3)
541 } while (sb != sbr->kx[1] + sbr->m[1]);
543 if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
549 /// Derived Frequency Band Tables (14496-3 sp04 p197)
550 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
554 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
555 sbr->n[0] = (sbr->n[1] + 1) >> 1;
557 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
558 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
559 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
560 sbr->kx[1] = sbr->f_tablehigh[0];
562 // Requirements (14496-3 sp04 p205)
563 if (sbr->kx[1] + sbr->m[1] > 64) {
564 av_log(ac->avctx, AV_LOG_ERROR,
565 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
568 if (sbr->kx[1] > 32) {
569 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
573 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
574 temp = sbr->n[1] & 1;
575 for (k = 1; k <= sbr->n[0]; k++)
576 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
578 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
579 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
581 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
585 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
587 for (k = 1; k <= sbr->n_q; k++) {
588 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
589 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
592 if (sbr_hf_calc_npatches(ac, sbr) < 0)
595 sbr_make_f_tablelim(sbr);
597 sbr->data[0].f_indexnoise = 0;
598 sbr->data[1].f_indexnoise = 0;
603 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
607 for (i = 0; i < elements; i++) {
608 vec[i] = get_bits1(gb);
612 /** ceil(log2(index+1)) */
613 static const int8_t ceil_log2[] = {
617 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
618 GetBitContext *gb, SBRData *ch_data)
621 unsigned bs_pointer = 0;
622 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
623 int abs_bord_trail = 16;
624 int num_rel_lead, num_rel_trail;
625 unsigned bs_num_env_old = ch_data->bs_num_env;
627 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
628 ch_data->bs_amp_res = sbr->bs_amp_res_header;
629 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
631 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
633 ch_data->bs_num_env = 1 << get_bits(gb, 2);
634 num_rel_lead = ch_data->bs_num_env - 1;
635 if (ch_data->bs_num_env == 1)
636 ch_data->bs_amp_res = 0;
638 if (ch_data->bs_num_env > 4) {
639 av_log(ac->avctx, AV_LOG_ERROR,
640 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
641 ch_data->bs_num_env);
645 ch_data->t_env[0] = 0;
646 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
648 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
650 for (i = 0; i < num_rel_lead; i++)
651 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
653 ch_data->bs_freq_res[1] = get_bits1(gb);
654 for (i = 1; i < ch_data->bs_num_env; i++)
655 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
658 abs_bord_trail += get_bits(gb, 2);
659 num_rel_trail = get_bits(gb, 2);
660 ch_data->bs_num_env = num_rel_trail + 1;
661 ch_data->t_env[0] = 0;
662 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
664 for (i = 0; i < num_rel_trail; i++)
665 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
666 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
668 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
670 for (i = 0; i < ch_data->bs_num_env; i++)
671 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
674 ch_data->t_env[0] = get_bits(gb, 2);
675 num_rel_lead = get_bits(gb, 2);
676 ch_data->bs_num_env = num_rel_lead + 1;
677 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
679 for (i = 0; i < num_rel_lead; i++)
680 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
682 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
684 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
687 ch_data->t_env[0] = get_bits(gb, 2);
688 abs_bord_trail += get_bits(gb, 2);
689 num_rel_lead = get_bits(gb, 2);
690 num_rel_trail = get_bits(gb, 2);
691 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
693 if (ch_data->bs_num_env > 5) {
694 av_log(ac->avctx, AV_LOG_ERROR,
695 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
696 ch_data->bs_num_env);
700 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
702 for (i = 0; i < num_rel_lead; i++)
703 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
704 for (i = 0; i < num_rel_trail; i++)
705 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
706 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
708 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
710 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
714 if (bs_pointer > ch_data->bs_num_env + 1) {
715 av_log(ac->avctx, AV_LOG_ERROR,
716 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
721 for (i = 1; i <= ch_data->bs_num_env; i++) {
722 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
723 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
728 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
730 ch_data->t_q[0] = ch_data->t_env[0];
731 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
732 if (ch_data->bs_num_noise > 1) {
734 if (ch_data->bs_frame_class == FIXFIX) {
735 idx = ch_data->bs_num_env >> 1;
736 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
737 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
741 else if (bs_pointer == 1)
742 idx = ch_data->bs_num_env - 1;
743 else // bs_pointer > 1
744 idx = bs_pointer - 1;
746 ch_data->t_q[1] = ch_data->t_env[idx];
749 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
750 ch_data->e_a[1] = -1;
751 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
752 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
753 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
754 ch_data->e_a[1] = bs_pointer - 1;
759 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
760 //These variables are saved from the previous frame rather than copied
761 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
762 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
763 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
765 //These variables are read from the bitstream and therefore copied
766 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
767 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
768 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
769 dst->bs_num_env = src->bs_num_env;
770 dst->bs_amp_res = src->bs_amp_res;
771 dst->bs_num_noise = src->bs_num_noise;
772 dst->bs_frame_class = src->bs_frame_class;
773 dst->e_a[1] = src->e_a[1];
776 /// Read how the envelope and noise floor data is delta coded
777 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
780 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
781 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
784 /// Read inverse filtering data
785 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
790 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
791 for (i = 0; i < sbr->n_q; i++)
792 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
795 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
796 SBRData *ch_data, int ch)
800 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
802 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
803 const int odd = sbr->n[1] & 1;
805 if (sbr->bs_coupling && ch) {
806 if (ch_data->bs_amp_res) {
808 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
809 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
810 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
811 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
814 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
815 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
816 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
817 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
820 if (ch_data->bs_amp_res) {
822 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
823 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
824 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
825 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
828 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
829 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
830 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
831 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
835 for (i = 0; i < ch_data->bs_num_env; i++) {
836 if (ch_data->bs_df_env[i]) {
837 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
838 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
839 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
840 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
841 } else if (ch_data->bs_freq_res[i + 1]) {
842 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
843 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
844 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
847 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
848 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
849 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
853 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
854 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
855 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);
859 //assign 0th elements of env_facs from last elements
860 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
861 sizeof(ch_data->env_facs[0]));
864 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
865 SBRData *ch_data, int ch)
868 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
870 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
872 if (sbr->bs_coupling && ch) {
873 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
874 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
875 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
876 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
878 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
879 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
880 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
881 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
884 for (i = 0; i < ch_data->bs_num_noise; i++) {
885 if (ch_data->bs_df_noise[i]) {
886 for (j = 0; j < sbr->n_q; j++)
887 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
889 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
890 for (j = 1; j < sbr->n_q; j++)
891 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);
895 //assign 0th elements of noise_facs from last elements
896 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
897 sizeof(ch_data->noise_facs[0]));
900 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
902 int bs_extension_id, int *num_bits_left)
904 switch (bs_extension_id) {
905 case EXTENSION_ID_PS:
907 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
908 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
912 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
914 av_log_missing_feature(ac->avctx, "Parametric Stereo is", 0);
915 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
921 av_log_missing_feature(ac->avctx, "Reserved SBR extensions are", 1);
922 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
928 static int read_sbr_single_channel_element(AACContext *ac,
929 SpectralBandReplication *sbr,
932 if (get_bits1(gb)) // bs_data_extra
933 skip_bits(gb, 4); // bs_reserved
935 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
937 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
938 read_sbr_invf(sbr, gb, &sbr->data[0]);
939 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
940 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
942 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
943 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
948 static int read_sbr_channel_pair_element(AACContext *ac,
949 SpectralBandReplication *sbr,
952 if (get_bits1(gb)) // bs_data_extra
953 skip_bits(gb, 8); // bs_reserved
955 if ((sbr->bs_coupling = get_bits1(gb))) {
956 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
958 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
959 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
960 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
961 read_sbr_invf(sbr, gb, &sbr->data[0]);
962 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
963 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
964 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
965 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
966 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
967 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
969 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
970 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
972 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
973 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
974 read_sbr_invf(sbr, gb, &sbr->data[0]);
975 read_sbr_invf(sbr, gb, &sbr->data[1]);
976 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
977 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
978 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
979 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
982 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
983 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
984 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
985 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
990 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
991 GetBitContext *gb, int id_aac)
993 unsigned int cnt = get_bits_count(gb);
995 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
996 if (read_sbr_single_channel_element(ac, sbr, gb)) {
998 return get_bits_count(gb) - cnt;
1000 } else if (id_aac == TYPE_CPE) {
1001 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1003 return get_bits_count(gb) - cnt;
1006 av_log(ac->avctx, AV_LOG_ERROR,
1007 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1009 return get_bits_count(gb) - cnt;
1011 if (get_bits1(gb)) { // bs_extended_data
1012 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1013 if (num_bits_left == 15)
1014 num_bits_left += get_bits(gb, 8); // bs_esc_count
1016 num_bits_left <<= 3;
1017 while (num_bits_left > 7) {
1019 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1021 if (num_bits_left < 0) {
1022 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1024 if (num_bits_left > 0)
1025 skip_bits(gb, num_bits_left);
1028 return get_bits_count(gb) - cnt;
1031 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1034 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1036 err = sbr_make_f_derived(ac, sbr);
1038 av_log(ac->avctx, AV_LOG_ERROR,
1039 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1045 * Decode Spectral Band Replication extension data; reference: table 4.55.
1047 * @param crc flag indicating the presence of CRC checksum
1048 * @param cnt length of TYPE_FIL syntactic element in bytes
1050 * @return Returns number of bytes consumed from the TYPE_FIL element.
1052 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1053 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1055 unsigned int num_sbr_bits = 0, num_align_bits;
1056 unsigned bytes_read;
1057 GetBitContext gbc = *gb_host, *gb = &gbc;
1058 skip_bits_long(gb_host, cnt*8 - 4);
1062 if (!sbr->sample_rate)
1063 sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1064 if (!ac->m4ac.ext_sample_rate)
1065 ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
1068 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1072 //Save some state from the previous frame.
1073 sbr->kx[0] = sbr->kx[1];
1074 sbr->m[0] = sbr->m[1];
1077 if (get_bits1(gb)) // bs_header_flag
1078 num_sbr_bits += read_sbr_header(sbr, gb);
1084 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1086 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1087 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1089 if (bytes_read > cnt) {
1090 av_log(ac->avctx, AV_LOG_ERROR,
1091 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1096 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1097 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1102 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1103 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1104 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1105 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1106 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1107 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1108 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1109 float fac = temp1 / (1.0f + temp2);
1110 sbr->data[0].env_facs[e][k] = fac;
1111 sbr->data[1].env_facs[e][k] = fac * temp2;
1114 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1115 for (k = 0; k < sbr->n_q; k++) {
1116 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1117 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1118 float fac = temp1 / (1.0f + temp2);
1119 sbr->data[0].noise_facs[e][k] = fac;
1120 sbr->data[1].noise_facs[e][k] = fac * temp2;
1123 } else { // SCE or one non-coupled CPE
1124 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1125 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1126 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1127 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1128 sbr->data[ch].env_facs[e][k] =
1129 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1130 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1131 for (k = 0; k < sbr->n_q; k++)
1132 sbr->data[ch].noise_facs[e][k] =
1133 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1139 * Analysis QMF Bank (14496-3 sp04 p206)
1141 * @param x pointer to the beginning of the first sample window
1142 * @param W array of complex-valued samples split into subbands
1144 static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct,
1145 SBRDSPContext *sbrdsp, const float *in, float *x,
1146 float z[320], float W[2][32][32][2])
1149 memcpy(W[0], W[1], sizeof(W[0]));
1150 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1151 memcpy(x+288, in, 1024*sizeof(x[0]));
1152 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1153 // are not supported
1154 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1156 sbrdsp->qmf_pre_shuffle(z);
1157 mdct->imdct_half(mdct, z, z+64);
1158 sbrdsp->qmf_post_shuffle(W[1][i], z);
1164 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1165 * (14496-3 sp04 p206)
1167 static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1168 SBRDSPContext *sbrdsp,
1169 float *out, float X[2][38][64],
1170 float mdct_buf[2][64],
1171 float *v0, int *v_off, const unsigned int div)
1174 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1175 const int step = 128 >> div;
1177 for (i = 0; i < 32; i++) {
1178 if (*v_off < step) {
1179 int saved_samples = (1280 - 128) >> div;
1180 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1181 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1187 for (n = 0; n < 32; n++) {
1188 X[0][i][ n] = -X[0][i][n];
1189 X[0][i][32+n] = X[1][i][31-n];
1191 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1192 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1194 sbrdsp->neg_odd_64(X[1][i]);
1195 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1196 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1197 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1199 dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1200 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1201 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1202 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1203 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1204 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1205 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1206 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1207 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1208 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1213 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1214 * (14496-3 sp04 p214)
1215 * Warning: This routine does not seem numerically stable.
1217 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
1218 float (*alpha0)[2], float (*alpha1)[2],
1219 const float X_low[32][40][2], int k0)
1222 for (k = 0; k < k0; k++) {
1223 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
1226 dsp->autocorrelate(X_low[k], phi);
1228 dk = phi[2][1][0] * phi[1][0][0] -
1229 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1235 float temp_real, temp_im;
1236 temp_real = phi[0][0][0] * phi[1][1][0] -
1237 phi[0][0][1] * phi[1][1][1] -
1238 phi[0][1][0] * phi[1][0][0];
1239 temp_im = phi[0][0][0] * phi[1][1][1] +
1240 phi[0][0][1] * phi[1][1][0] -
1241 phi[0][1][1] * phi[1][0][0];
1243 alpha1[k][0] = temp_real / dk;
1244 alpha1[k][1] = temp_im / dk;
1247 if (!phi[1][0][0]) {
1251 float temp_real, temp_im;
1252 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1253 alpha1[k][1] * phi[1][1][1];
1254 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1255 alpha1[k][0] * phi[1][1][1];
1257 alpha0[k][0] = -temp_real / phi[1][0][0];
1258 alpha0[k][1] = -temp_im / phi[1][0][0];
1261 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1262 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1271 /// Chirp Factors (14496-3 sp04 p214)
1272 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1276 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1278 for (i = 0; i < sbr->n_q; i++) {
1279 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1282 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1284 if (new_bw < ch_data->bw_array[i]) {
1285 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1287 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1288 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1292 /// Generate the subband filtered lowband
1293 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1294 float X_low[32][40][2], const float W[2][32][32][2])
1297 const int t_HFGen = 8;
1299 memset(X_low, 0, 32*sizeof(*X_low));
1300 for (k = 0; k < sbr->kx[1]; k++) {
1301 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1302 X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1303 X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1306 for (k = 0; k < sbr->kx[0]; k++) {
1307 for (i = 0; i < t_HFGen; i++) {
1308 X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1309 X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1315 /// High Frequency Generator (14496-3 sp04 p215)
1316 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1317 float X_high[64][40][2], const float X_low[32][40][2],
1318 const float (*alpha0)[2], const float (*alpha1)[2],
1319 const float bw_array[5], const uint8_t *t_env,
1325 for (j = 0; j < sbr->num_patches; j++) {
1326 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1327 const int p = sbr->patch_start_subband[j] + x;
1328 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1333 av_log(ac->avctx, AV_LOG_ERROR,
1334 "ERROR : no subband found for frequency %d\n", k);
1338 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1339 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1340 alpha0[p], alpha1[p], bw_array[g],
1341 2 * t_env[0], 2 * t_env[bs_num_env]);
1344 if (k < sbr->m[1] + sbr->kx[1])
1345 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1350 /// Generate the subband filtered lowband
1351 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1352 const float Y0[38][64][2], const float Y1[38][64][2],
1353 const float X_low[32][40][2], int ch)
1357 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1358 memset(X, 0, 2*sizeof(*X));
1359 for (k = 0; k < sbr->kx[0]; k++) {
1360 for (i = 0; i < i_Temp; i++) {
1361 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1362 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1365 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1366 for (i = 0; i < i_Temp; i++) {
1367 X[0][i][k] = Y0[i + i_f][k][0];
1368 X[1][i][k] = Y0[i + i_f][k][1];
1372 for (k = 0; k < sbr->kx[1]; k++) {
1373 for (i = i_Temp; i < 38; i++) {
1374 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1375 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1378 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1379 for (i = i_Temp; i < i_f; i++) {
1380 X[0][i][k] = Y1[i][k][0];
1381 X[1][i][k] = Y1[i][k][1];
1387 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1388 * (14496-3 sp04 p217)
1390 static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1391 SBRData *ch_data, int e_a[2])
1395 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1396 for (e = 0; e < ch_data->bs_num_env; e++) {
1397 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1398 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1401 for (i = 0; i < ilim; i++)
1402 for (m = table[i]; m < table[i + 1]; m++)
1403 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1405 // ch_data->bs_num_noise > 1 => 2 noise floors
1406 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1407 for (i = 0; i < sbr->n_q; i++)
1408 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1409 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1411 for (i = 0; i < sbr->n[1]; i++) {
1412 if (ch_data->bs_add_harmonic_flag) {
1413 const unsigned int m_midpoint =
1414 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1416 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1417 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1421 for (i = 0; i < ilim; i++) {
1422 int additional_sinusoid_present = 0;
1423 for (m = table[i]; m < table[i + 1]; m++) {
1424 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1425 additional_sinusoid_present = 1;
1429 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1430 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1434 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1437 /// Estimation of current envelope (14496-3 sp04 p218)
1438 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1439 SpectralBandReplication *sbr, SBRData *ch_data)
1442 int kx1 = sbr->kx[1];
1444 if (sbr->bs_interpol_freq) {
1445 for (e = 0; e < ch_data->bs_num_env; e++) {
1446 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1447 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1448 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1450 for (m = 0; m < sbr->m[1]; m++) {
1451 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1452 e_curr[e][m] = sum * recip_env_size;
1458 for (e = 0; e < ch_data->bs_num_env; e++) {
1459 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1460 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1461 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1462 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1464 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1466 const int den = env_size * (table[p + 1] - table[p]);
1468 for (k = table[p]; k < table[p + 1]; k++) {
1469 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1472 for (k = table[p]; k < table[p + 1]; k++) {
1473 e_curr[e][k - kx1] = sum;
1481 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1482 * and Calculation of gain (14496-3 sp04 p219)
1484 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1485 SBRData *ch_data, const int e_a[2])
1488 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1489 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1491 for (e = 0; e < ch_data->bs_num_env; e++) {
1492 int delta = !((e == e_a[1]) || (e == e_a[0]));
1493 for (k = 0; k < sbr->n_lim; k++) {
1494 float gain_boost, gain_max;
1495 float sum[2] = { 0.0f, 0.0f };
1496 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1497 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1498 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1499 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1500 if (!sbr->s_mapped[e][m]) {
1501 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1502 ((1.0f + sbr->e_curr[e][m]) *
1503 (1.0f + sbr->q_mapped[e][m] * delta)));
1505 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1506 ((1.0f + sbr->e_curr[e][m]) *
1507 (1.0f + sbr->q_mapped[e][m])));
1510 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1511 sum[0] += sbr->e_origmapped[e][m];
1512 sum[1] += sbr->e_curr[e][m];
1514 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1515 gain_max = FFMIN(100000.f, gain_max);
1516 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1517 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1518 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1519 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1521 sum[0] = sum[1] = 0.0f;
1522 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1523 sum[0] += sbr->e_origmapped[e][m];
1524 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1525 + sbr->s_m[e][m] * sbr->s_m[e][m]
1526 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1528 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1529 gain_boost = FFMIN(1.584893192f, gain_boost);
1530 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1531 sbr->gain[e][m] *= gain_boost;
1532 sbr->q_m[e][m] *= gain_boost;
1533 sbr->s_m[e][m] *= gain_boost;
1539 /// Assembling HF Signals (14496-3 sp04 p220)
1540 static void sbr_hf_assemble(float Y1[38][64][2],
1541 const float X_high[64][40][2],
1542 SpectralBandReplication *sbr, SBRData *ch_data,
1546 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1547 const int kx = sbr->kx[1];
1548 const int m_max = sbr->m[1];
1549 static const float h_smooth[5] = {
1556 static const int8_t phi[2][4] = {
1557 { 1, 0, -1, 0}, // real
1558 { 0, 1, 0, -1}, // imaginary
1560 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1561 int indexnoise = ch_data->f_indexnoise;
1562 int indexsine = ch_data->f_indexsine;
1565 for (i = 0; i < h_SL; i++) {
1566 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1567 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1570 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1571 memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1574 for (e = 0; e < ch_data->bs_num_env; e++) {
1575 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1576 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1577 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1581 for (e = 0; e < ch_data->bs_num_env; e++) {
1582 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1583 int phi_sign = (1 - 2*(kx & 1));
1584 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
1585 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
1586 float *g_filt, *q_filt;
1588 if (h_SL && e != e_a[0] && e != e_a[1]) {
1589 g_filt = g_filt_tab;
1590 q_filt = q_filt_tab;
1591 for (m = 0; m < m_max; m++) {
1592 const int idx1 = i + h_SL;
1595 for (j = 0; j <= h_SL; j++) {
1596 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
1597 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
1601 g_filt = g_temp[i + h_SL];
1605 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
1606 i + ENVELOPE_ADJUSTMENT_OFFSET);
1608 if (e != e_a[0] && e != e_a[1]) {
1609 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
1613 for (m = 0; m < m_max; m++) {
1615 sbr->s_m[e][m] * phi[0][indexsine];
1617 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1618 phi_sign = -phi_sign;
1621 indexnoise = (indexnoise + m_max) & 0x1ff;
1622 indexsine = (indexsine + 1) & 3;
1625 ch_data->f_indexnoise = indexnoise;
1626 ch_data->f_indexsine = indexsine;
1629 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1632 int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
1634 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1637 sbr_dequant(sbr, id_aac);
1639 for (ch = 0; ch < nch; ch++) {
1640 /* decode channel */
1641 sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1642 (float*)sbr->qmf_filter_scratch,
1644 sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1646 sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1647 sbr_chirp(sbr, &sbr->data[ch]);
1648 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1649 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1650 sbr->data[ch].bs_num_env);
1653 sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1654 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1655 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1656 sbr->data[ch].Ypos ^= 1;
1657 sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1658 sbr->X_high, sbr, &sbr->data[ch],
1663 sbr_x_gen(sbr, sbr->X[ch],
1664 sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1665 sbr->data[ch].Y[ sbr->data[ch].Ypos],
1669 if (ac->m4ac.ps == 1) {
1670 if (sbr->ps.start) {
1671 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1673 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1678 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, &sbr->dsp, L, sbr->X[0], sbr->qmf_filter_scratch,
1679 sbr->data[0].synthesis_filterbank_samples,
1680 &sbr->data[0].synthesis_filterbank_samples_offset,
1683 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, &sbr->dsp, R, sbr->X[1], sbr->qmf_filter_scratch,
1684 sbr->data[1].synthesis_filterbank_samples,
1685 &sbr->data[1].synthesis_filterbank_samples_offset,