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/internal.h"
37 #include "libavutil/libm.h"
42 #define ENVELOPE_ADJUSTMENT_OFFSET 2
43 #define NOISE_FLOOR_OFFSET 6.0f
51 T_HUFFMAN_ENV_BAL_1_5DB,
52 F_HUFFMAN_ENV_BAL_1_5DB,
55 T_HUFFMAN_ENV_BAL_3_0DB,
56 F_HUFFMAN_ENV_BAL_3_0DB,
57 T_HUFFMAN_NOISE_3_0DB,
58 T_HUFFMAN_NOISE_BAL_3_0DB,
62 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
75 static VLC vlc_sbr[10];
76 static const int8_t vlc_sbr_lav[10] =
77 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
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 /** Places SBR in pure upsampling mode. */
131 static void sbr_turnoff(SpectralBandReplication *sbr) {
133 // Init defaults used in pure upsampling mode
134 sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
136 // Reset values for first SBR header
137 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
138 memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
141 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
143 sbr->kx[0] = sbr->kx[1];
145 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
146 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
147 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
148 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
149 * and scale back down at synthesis. */
150 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));
151 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
152 ff_ps_ctx_init(&sbr->ps);
153 ff_sbrdsp_init(&sbr->dsp);
156 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
158 ff_mdct_end(&sbr->mdct);
159 ff_mdct_end(&sbr->mdct_ana);
162 static int qsort_comparison_function_int16(const void *a, const void *b)
164 return *(const int16_t *)a - *(const int16_t *)b;
167 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
170 for (i = 0; i <= last_el; i++)
171 if (table[i] == needle)
176 /// Limiter Frequency Band Table (14496-3 sp04 p198)
177 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
180 if (sbr->bs_limiter_bands > 0) {
181 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
182 1.18509277094158210129f, //2^(0.49/2)
183 1.11987160404675912501f }; //2^(0.49/3)
184 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
185 int16_t patch_borders[7];
186 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
188 patch_borders[0] = sbr->kx[1];
189 for (k = 1; k <= sbr->num_patches; k++)
190 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
192 memcpy(sbr->f_tablelim, sbr->f_tablelow,
193 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
194 if (sbr->num_patches > 1)
195 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
196 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
198 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
199 sizeof(sbr->f_tablelim[0]),
200 qsort_comparison_function_int16);
202 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
203 while (out < sbr->f_tablelim + sbr->n_lim) {
204 if (*in >= *out * lim_bands_per_octave_warped) {
206 } else if (*in == *out ||
207 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
210 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
218 sbr->f_tablelim[0] = sbr->f_tablelow[0];
219 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
224 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
226 unsigned int cnt = get_bits_count(gb);
227 uint8_t bs_header_extra_1;
228 uint8_t bs_header_extra_2;
229 int old_bs_limiter_bands = sbr->bs_limiter_bands;
230 SpectrumParameters old_spectrum_params;
234 // Save last spectrum parameters variables to compare to new ones
235 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
237 sbr->bs_amp_res_header = get_bits1(gb);
238 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
239 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
240 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
241 skip_bits(gb, 2); // bs_reserved
243 bs_header_extra_1 = get_bits1(gb);
244 bs_header_extra_2 = get_bits1(gb);
246 if (bs_header_extra_1) {
247 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
248 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
249 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
251 sbr->spectrum_params.bs_freq_scale = 2;
252 sbr->spectrum_params.bs_alter_scale = 1;
253 sbr->spectrum_params.bs_noise_bands = 2;
256 // Check if spectrum parameters changed
257 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
260 if (bs_header_extra_2) {
261 sbr->bs_limiter_bands = get_bits(gb, 2);
262 sbr->bs_limiter_gains = get_bits(gb, 2);
263 sbr->bs_interpol_freq = get_bits1(gb);
264 sbr->bs_smoothing_mode = get_bits1(gb);
266 sbr->bs_limiter_bands = 2;
267 sbr->bs_limiter_gains = 2;
268 sbr->bs_interpol_freq = 1;
269 sbr->bs_smoothing_mode = 1;
272 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
273 sbr_make_f_tablelim(sbr);
275 return get_bits_count(gb) - cnt;
278 static int array_min_int16(const int16_t *array, int nel)
280 int i, min = array[0];
281 for (i = 1; i < nel; i++)
282 min = FFMIN(array[i], min);
286 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
288 int k, previous, present;
291 base = powf((float)stop / start, 1.0f / num_bands);
295 for (k = 0; k < num_bands-1; k++) {
297 present = lrintf(prod);
298 bands[k] = present - previous;
301 bands[num_bands-1] = stop - previous;
304 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
306 // Requirements (14496-3 sp04 p205)
308 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
311 if (bs_xover_band >= n_master) {
312 av_log(avctx, AV_LOG_ERROR,
313 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
320 /// Master Frequency Band Table (14496-3 sp04 p194)
321 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
322 SpectrumParameters *spectrum)
324 unsigned int temp, max_qmf_subbands = 0;
325 unsigned int start_min, stop_min;
327 const int8_t *sbr_offset_ptr;
330 if (sbr->sample_rate < 32000) {
332 } else if (sbr->sample_rate < 64000) {
337 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
338 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
340 switch (sbr->sample_rate) {
342 sbr_offset_ptr = sbr_offset[0];
345 sbr_offset_ptr = sbr_offset[1];
348 sbr_offset_ptr = sbr_offset[2];
351 sbr_offset_ptr = sbr_offset[3];
353 case 44100: case 48000: case 64000:
354 sbr_offset_ptr = sbr_offset[4];
356 case 88200: case 96000: case 128000: case 176400: case 192000:
357 sbr_offset_ptr = sbr_offset[5];
360 av_log(ac->avctx, AV_LOG_ERROR,
361 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
365 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
367 if (spectrum->bs_stop_freq < 14) {
368 sbr->k[2] = stop_min;
369 make_bands(stop_dk, stop_min, 64, 13);
370 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
371 for (k = 0; k < spectrum->bs_stop_freq; k++)
372 sbr->k[2] += stop_dk[k];
373 } else if (spectrum->bs_stop_freq == 14) {
374 sbr->k[2] = 2*sbr->k[0];
375 } else if (spectrum->bs_stop_freq == 15) {
376 sbr->k[2] = 3*sbr->k[0];
378 av_log(ac->avctx, AV_LOG_ERROR,
379 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
382 sbr->k[2] = FFMIN(64, sbr->k[2]);
384 // Requirements (14496-3 sp04 p205)
385 if (sbr->sample_rate <= 32000) {
386 max_qmf_subbands = 48;
387 } else if (sbr->sample_rate == 44100) {
388 max_qmf_subbands = 35;
389 } else if (sbr->sample_rate >= 48000)
390 max_qmf_subbands = 32;
392 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
393 av_log(ac->avctx, AV_LOG_ERROR,
394 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
398 if (!spectrum->bs_freq_scale) {
401 dk = spectrum->bs_alter_scale + 1;
402 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
403 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
406 for (k = 1; k <= sbr->n_master; k++)
407 sbr->f_master[k] = dk;
409 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
412 sbr->f_master[2]-= (k2diff < -1);
414 sbr->f_master[sbr->n_master]++;
417 sbr->f_master[0] = sbr->k[0];
418 for (k = 1; k <= sbr->n_master; k++)
419 sbr->f_master[k] += sbr->f_master[k - 1];
422 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
423 int two_regions, num_bands_0;
424 int vdk0_max, vdk1_min;
427 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
429 sbr->k[1] = 2 * sbr->k[0];
432 sbr->k[1] = sbr->k[2];
435 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
437 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
438 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
444 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
446 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
447 vdk0_max = vk0[num_bands_0];
450 for (k = 1; k <= num_bands_0; k++) {
451 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
452 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
460 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
461 : 1.0f; // bs_alter_scale = {0,1}
462 int num_bands_1 = lrintf(half_bands * invwarp *
463 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
465 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
467 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
469 if (vdk1_min < vdk0_max) {
471 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
472 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
474 vk1[num_bands_1] -= change;
477 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
480 for (k = 1; k <= num_bands_1; k++) {
481 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
482 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
488 sbr->n_master = num_bands_0 + num_bands_1;
489 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
491 memcpy(&sbr->f_master[0], vk0,
492 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
493 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
494 num_bands_1 * sizeof(sbr->f_master[0]));
497 sbr->n_master = num_bands_0;
498 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
500 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
507 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
508 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
512 int usb = sbr->kx[1];
513 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
515 sbr->num_patches = 0;
517 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
518 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
524 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
525 sb = sbr->f_master[i];
526 odd = (sb + sbr->k[0]) & 1;
529 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
530 // After this check the final number of patches can still be six which is
531 // illegal however the Coding Technologies decoder check stream has a final
532 // count of 6 patches
533 if (sbr->num_patches > 5) {
534 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
538 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
539 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
541 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
548 if (sbr->f_master[k] - sb < 3)
550 } while (sb != sbr->kx[1] + sbr->m[1]);
552 if (sbr->num_patches > 1 &&
553 sbr->patch_num_subbands[sbr->num_patches - 1] < 3)
559 /// Derived Frequency Band Tables (14496-3 sp04 p197)
560 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
564 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
565 sbr->n[0] = (sbr->n[1] + 1) >> 1;
567 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
568 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
569 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
570 sbr->kx[1] = sbr->f_tablehigh[0];
572 // Requirements (14496-3 sp04 p205)
573 if (sbr->kx[1] + sbr->m[1] > 64) {
574 av_log(ac->avctx, AV_LOG_ERROR,
575 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
578 if (sbr->kx[1] > 32) {
579 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
583 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
584 temp = sbr->n[1] & 1;
585 for (k = 1; k <= sbr->n[0]; k++)
586 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
588 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
589 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
591 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
595 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
597 for (k = 1; k <= sbr->n_q; k++) {
598 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
599 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
602 if (sbr_hf_calc_npatches(ac, sbr) < 0)
605 sbr_make_f_tablelim(sbr);
607 sbr->data[0].f_indexnoise = 0;
608 sbr->data[1].f_indexnoise = 0;
613 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
617 for (i = 0; i < elements; i++) {
618 vec[i] = get_bits1(gb);
622 /** ceil(log2(index+1)) */
623 static const int8_t ceil_log2[] = {
627 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
628 GetBitContext *gb, SBRData *ch_data)
632 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
633 int abs_bord_trail = 16;
634 int num_rel_lead, num_rel_trail;
635 unsigned bs_num_env_old = ch_data->bs_num_env;
637 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
638 ch_data->bs_amp_res = sbr->bs_amp_res_header;
639 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
641 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
643 ch_data->bs_num_env = 1 << get_bits(gb, 2);
644 num_rel_lead = ch_data->bs_num_env - 1;
645 if (ch_data->bs_num_env == 1)
646 ch_data->bs_amp_res = 0;
648 if (ch_data->bs_num_env > 4) {
649 av_log(ac->avctx, AV_LOG_ERROR,
650 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
651 ch_data->bs_num_env);
655 ch_data->t_env[0] = 0;
656 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
658 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
660 for (i = 0; i < num_rel_lead; i++)
661 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
663 ch_data->bs_freq_res[1] = get_bits1(gb);
664 for (i = 1; i < ch_data->bs_num_env; i++)
665 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
668 abs_bord_trail += get_bits(gb, 2);
669 num_rel_trail = get_bits(gb, 2);
670 ch_data->bs_num_env = num_rel_trail + 1;
671 ch_data->t_env[0] = 0;
672 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
674 for (i = 0; i < num_rel_trail; i++)
675 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
676 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
678 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
680 for (i = 0; i < ch_data->bs_num_env; i++)
681 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
684 ch_data->t_env[0] = get_bits(gb, 2);
685 num_rel_lead = get_bits(gb, 2);
686 ch_data->bs_num_env = num_rel_lead + 1;
687 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
689 for (i = 0; i < num_rel_lead; i++)
690 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
692 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
694 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
697 ch_data->t_env[0] = get_bits(gb, 2);
698 abs_bord_trail += get_bits(gb, 2);
699 num_rel_lead = get_bits(gb, 2);
700 num_rel_trail = get_bits(gb, 2);
701 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
703 if (ch_data->bs_num_env > 5) {
704 av_log(ac->avctx, AV_LOG_ERROR,
705 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
706 ch_data->bs_num_env);
710 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
712 for (i = 0; i < num_rel_lead; i++)
713 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
714 for (i = 0; i < num_rel_trail; i++)
715 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
716 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
718 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
720 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
724 if (bs_pointer < 0 || bs_pointer > ch_data->bs_num_env + 1) {
725 av_log(ac->avctx, AV_LOG_ERROR,
726 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
731 for (i = 1; i <= ch_data->bs_num_env; i++) {
732 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
733 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
738 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
740 ch_data->t_q[0] = ch_data->t_env[0];
741 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
742 if (ch_data->bs_num_noise > 1) {
744 if (ch_data->bs_frame_class == FIXFIX) {
745 idx = ch_data->bs_num_env >> 1;
746 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
747 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
751 else if (bs_pointer == 1)
752 idx = ch_data->bs_num_env - 1;
753 else // bs_pointer > 1
754 idx = bs_pointer - 1;
756 ch_data->t_q[1] = ch_data->t_env[idx];
759 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
760 ch_data->e_a[1] = -1;
761 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
762 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
763 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
764 ch_data->e_a[1] = bs_pointer - 1;
769 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
770 //These variables are saved from the previous frame rather than copied
771 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
772 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
773 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
775 //These variables are read from the bitstream and therefore copied
776 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
777 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
778 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
779 dst->bs_num_env = src->bs_num_env;
780 dst->bs_amp_res = src->bs_amp_res;
781 dst->bs_num_noise = src->bs_num_noise;
782 dst->bs_frame_class = src->bs_frame_class;
783 dst->e_a[1] = src->e_a[1];
786 /// Read how the envelope and noise floor data is delta coded
787 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
790 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
791 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
794 /// Read inverse filtering data
795 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
800 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
801 for (i = 0; i < sbr->n_q; i++)
802 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
805 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
806 SBRData *ch_data, int ch)
810 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
812 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
813 const int odd = sbr->n[1] & 1;
815 if (sbr->bs_coupling && ch) {
816 if (ch_data->bs_amp_res) {
818 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
819 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
820 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
821 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
824 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
825 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
826 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
827 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
830 if (ch_data->bs_amp_res) {
832 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
833 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
834 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
835 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
838 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
839 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
840 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
841 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
845 for (i = 0; i < ch_data->bs_num_env; i++) {
846 if (ch_data->bs_df_env[i]) {
847 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
848 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
849 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
850 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
851 } else if (ch_data->bs_freq_res[i + 1]) {
852 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
853 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
854 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
857 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
858 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
859 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
863 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
864 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
865 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);
869 //assign 0th elements of env_facs from last elements
870 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
871 sizeof(ch_data->env_facs[0]));
874 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
875 SBRData *ch_data, int ch)
878 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
880 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
882 if (sbr->bs_coupling && ch) {
883 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
884 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
885 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
886 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
888 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
889 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
890 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
891 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
894 for (i = 0; i < ch_data->bs_num_noise; i++) {
895 if (ch_data->bs_df_noise[i]) {
896 for (j = 0; j < sbr->n_q; j++)
897 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
899 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
900 for (j = 1; j < sbr->n_q; j++)
901 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);
905 //assign 0th elements of noise_facs from last elements
906 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
907 sizeof(ch_data->noise_facs[0]));
910 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
912 int bs_extension_id, int *num_bits_left)
914 switch (bs_extension_id) {
915 case EXTENSION_ID_PS:
916 if (!ac->oc[1].m4ac.ps) {
917 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
918 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
921 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
922 ac->avctx->profile = FF_PROFILE_AAC_HE_V2;
926 // some files contain 0-padding
927 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
928 avpriv_request_sample(ac->avctx, "Reserved SBR extensions");
929 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
935 static int read_sbr_single_channel_element(AACContext *ac,
936 SpectralBandReplication *sbr,
939 if (get_bits1(gb)) // bs_data_extra
940 skip_bits(gb, 4); // bs_reserved
942 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
944 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
945 read_sbr_invf(sbr, gb, &sbr->data[0]);
946 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
947 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
949 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
950 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
955 static int read_sbr_channel_pair_element(AACContext *ac,
956 SpectralBandReplication *sbr,
959 if (get_bits1(gb)) // bs_data_extra
960 skip_bits(gb, 8); // bs_reserved
962 if ((sbr->bs_coupling = get_bits1(gb))) {
963 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
965 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
966 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
967 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
968 read_sbr_invf(sbr, gb, &sbr->data[0]);
969 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
970 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
971 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
972 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
973 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
974 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
976 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
977 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
979 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
980 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
981 read_sbr_invf(sbr, gb, &sbr->data[0]);
982 read_sbr_invf(sbr, gb, &sbr->data[1]);
983 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
984 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
985 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
986 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
989 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
990 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
991 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
992 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
997 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
998 GetBitContext *gb, int id_aac)
1000 unsigned int cnt = get_bits_count(gb);
1002 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
1003 if (read_sbr_single_channel_element(ac, sbr, gb)) {
1005 return get_bits_count(gb) - cnt;
1007 } else if (id_aac == TYPE_CPE) {
1008 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1010 return get_bits_count(gb) - cnt;
1013 av_log(ac->avctx, AV_LOG_ERROR,
1014 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1016 return get_bits_count(gb) - cnt;
1018 if (get_bits1(gb)) { // bs_extended_data
1019 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1020 if (num_bits_left == 15)
1021 num_bits_left += get_bits(gb, 8); // bs_esc_count
1023 num_bits_left <<= 3;
1024 while (num_bits_left > 7) {
1026 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1028 if (num_bits_left < 0) {
1029 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1031 if (num_bits_left > 0)
1032 skip_bits(gb, num_bits_left);
1035 return get_bits_count(gb) - cnt;
1038 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1041 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1043 err = sbr_make_f_derived(ac, sbr);
1045 av_log(ac->avctx, AV_LOG_ERROR,
1046 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1052 * Decode Spectral Band Replication extension data; reference: table 4.55.
1054 * @param crc flag indicating the presence of CRC checksum
1055 * @param cnt length of TYPE_FIL syntactic element in bytes
1057 * @return Returns number of bytes consumed from the TYPE_FIL element.
1059 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1060 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1062 unsigned int num_sbr_bits = 0, num_align_bits;
1063 unsigned bytes_read;
1064 GetBitContext gbc = *gb_host, *gb = &gbc;
1065 skip_bits_long(gb_host, cnt*8 - 4);
1069 if (!sbr->sample_rate)
1070 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1071 if (!ac->oc[1].m4ac.ext_sample_rate)
1072 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
1075 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1079 //Save some state from the previous frame.
1080 sbr->kx[0] = sbr->kx[1];
1081 sbr->m[0] = sbr->m[1];
1082 sbr->kx_and_m_pushed = 1;
1085 if (get_bits1(gb)) // bs_header_flag
1086 num_sbr_bits += read_sbr_header(sbr, gb);
1092 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1094 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1095 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1097 if (bytes_read > cnt) {
1098 av_log(ac->avctx, AV_LOG_ERROR,
1099 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1104 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1105 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1110 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1111 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1112 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1113 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1114 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1115 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1116 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1117 float fac = temp1 / (1.0f + temp2);
1118 sbr->data[0].env_facs[e][k] = fac;
1119 sbr->data[1].env_facs[e][k] = fac * temp2;
1122 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1123 for (k = 0; k < sbr->n_q; k++) {
1124 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1125 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1126 float fac = temp1 / (1.0f + temp2);
1127 sbr->data[0].noise_facs[e][k] = fac;
1128 sbr->data[1].noise_facs[e][k] = fac * temp2;
1131 } else { // SCE or one non-coupled CPE
1132 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1133 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1134 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1135 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1136 sbr->data[ch].env_facs[e][k] =
1137 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1138 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1139 for (k = 0; k < sbr->n_q; k++)
1140 sbr->data[ch].noise_facs[e][k] =
1141 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1147 * Analysis QMF Bank (14496-3 sp04 p206)
1149 * @param x pointer to the beginning of the first sample window
1150 * @param W array of complex-valued samples split into subbands
1152 static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,
1153 SBRDSPContext *sbrdsp, const float *in, float *x,
1154 float z[320], float W[2][32][32][2], int buf_idx)
1157 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1158 memcpy(x+288, in, 1024*sizeof(x[0]));
1159 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1160 // are not supported
1161 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1163 sbrdsp->qmf_pre_shuffle(z);
1164 mdct->imdct_half(mdct, z, z+64);
1165 sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
1171 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1172 * (14496-3 sp04 p206)
1174 static void sbr_qmf_synthesis(FFTContext *mdct,
1175 SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,
1176 float *out, float X[2][38][64],
1177 float mdct_buf[2][64],
1178 float *v0, int *v_off, const unsigned int div)
1181 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1182 const int step = 128 >> div;
1184 for (i = 0; i < 32; i++) {
1185 if (*v_off < step) {
1186 int saved_samples = (1280 - 128) >> div;
1187 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1188 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1194 for (n = 0; n < 32; n++) {
1195 X[0][i][ n] = -X[0][i][n];
1196 X[0][i][32+n] = X[1][i][31-n];
1198 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1199 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1201 sbrdsp->neg_odd_64(X[1][i]);
1202 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1203 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1204 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1206 dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);
1207 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1208 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1209 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1210 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1211 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1212 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1213 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1214 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1215 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1220 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1221 * (14496-3 sp04 p214)
1222 * Warning: This routine does not seem numerically stable.
1224 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
1225 float (*alpha0)[2], float (*alpha1)[2],
1226 const float X_low[32][40][2], int k0)
1229 for (k = 0; k < k0; k++) {
1230 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
1233 dsp->autocorrelate(X_low[k], phi);
1235 dk = phi[2][1][0] * phi[1][0][0] -
1236 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1242 float temp_real, temp_im;
1243 temp_real = phi[0][0][0] * phi[1][1][0] -
1244 phi[0][0][1] * phi[1][1][1] -
1245 phi[0][1][0] * phi[1][0][0];
1246 temp_im = phi[0][0][0] * phi[1][1][1] +
1247 phi[0][0][1] * phi[1][1][0] -
1248 phi[0][1][1] * phi[1][0][0];
1250 alpha1[k][0] = temp_real / dk;
1251 alpha1[k][1] = temp_im / dk;
1254 if (!phi[1][0][0]) {
1258 float temp_real, temp_im;
1259 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1260 alpha1[k][1] * phi[1][1][1];
1261 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1262 alpha1[k][0] * phi[1][1][1];
1264 alpha0[k][0] = -temp_real / phi[1][0][0];
1265 alpha0[k][1] = -temp_im / phi[1][0][0];
1268 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1269 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1278 /// Chirp Factors (14496-3 sp04 p214)
1279 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1283 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1285 for (i = 0; i < sbr->n_q; i++) {
1286 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1289 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1291 if (new_bw < ch_data->bw_array[i]) {
1292 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1294 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1295 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1299 /// Generate the subband filtered lowband
1300 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1301 float X_low[32][40][2], const float W[2][32][32][2],
1305 const int t_HFGen = 8;
1307 memset(X_low, 0, 32*sizeof(*X_low));
1308 for (k = 0; k < sbr->kx[1]; k++) {
1309 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1310 X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
1311 X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
1314 buf_idx = 1-buf_idx;
1315 for (k = 0; k < sbr->kx[0]; k++) {
1316 for (i = 0; i < t_HFGen; i++) {
1317 X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
1318 X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
1324 /// High Frequency Generator (14496-3 sp04 p215)
1325 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1326 float X_high[64][40][2], const float X_low[32][40][2],
1327 const float (*alpha0)[2], const float (*alpha1)[2],
1328 const float bw_array[5], const uint8_t *t_env,
1334 for (j = 0; j < sbr->num_patches; j++) {
1335 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1336 const int p = sbr->patch_start_subband[j] + x;
1337 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1342 av_log(ac->avctx, AV_LOG_ERROR,
1343 "ERROR : no subband found for frequency %d\n", k);
1347 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1348 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1349 alpha0[p], alpha1[p], bw_array[g],
1350 2 * t_env[0], 2 * t_env[bs_num_env]);
1353 if (k < sbr->m[1] + sbr->kx[1])
1354 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1359 /// Generate the subband filtered lowband
1360 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1361 const float Y0[38][64][2], const float Y1[38][64][2],
1362 const float X_low[32][40][2], int ch)
1366 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1367 memset(X, 0, 2*sizeof(*X));
1368 for (k = 0; k < sbr->kx[0]; k++) {
1369 for (i = 0; i < i_Temp; i++) {
1370 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1371 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1374 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1375 for (i = 0; i < i_Temp; i++) {
1376 X[0][i][k] = Y0[i + i_f][k][0];
1377 X[1][i][k] = Y0[i + i_f][k][1];
1381 for (k = 0; k < sbr->kx[1]; k++) {
1382 for (i = i_Temp; i < 38; i++) {
1383 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1384 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1387 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1388 for (i = i_Temp; i < i_f; i++) {
1389 X[0][i][k] = Y1[i][k][0];
1390 X[1][i][k] = Y1[i][k][1];
1396 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1397 * (14496-3 sp04 p217)
1399 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1400 SBRData *ch_data, int e_a[2])
1404 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1405 for (e = 0; e < ch_data->bs_num_env; e++) {
1406 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1407 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1410 if (sbr->kx[1] != table[0]) {
1411 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
1412 "Derived frequency tables were not regenerated.\n");
1416 for (i = 0; i < ilim; i++)
1417 for (m = table[i]; m < table[i + 1]; m++)
1418 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1420 // ch_data->bs_num_noise > 1 => 2 noise floors
1421 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1422 for (i = 0; i < sbr->n_q; i++)
1423 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1424 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1426 for (i = 0; i < sbr->n[1]; i++) {
1427 if (ch_data->bs_add_harmonic_flag) {
1428 const unsigned int m_midpoint =
1429 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1431 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1432 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1436 for (i = 0; i < ilim; i++) {
1437 int additional_sinusoid_present = 0;
1438 for (m = table[i]; m < table[i + 1]; m++) {
1439 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1440 additional_sinusoid_present = 1;
1444 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1445 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1449 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1453 /// Estimation of current envelope (14496-3 sp04 p218)
1454 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1455 SpectralBandReplication *sbr, SBRData *ch_data)
1458 int kx1 = sbr->kx[1];
1460 if (sbr->bs_interpol_freq) {
1461 for (e = 0; e < ch_data->bs_num_env; e++) {
1462 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1463 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1464 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1466 for (m = 0; m < sbr->m[1]; m++) {
1467 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1468 e_curr[e][m] = sum * recip_env_size;
1474 for (e = 0; e < ch_data->bs_num_env; e++) {
1475 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1476 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1477 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1478 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1480 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1482 const int den = env_size * (table[p + 1] - table[p]);
1484 for (k = table[p]; k < table[p + 1]; k++) {
1485 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1488 for (k = table[p]; k < table[p + 1]; k++) {
1489 e_curr[e][k - kx1] = sum;
1497 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1498 * and Calculation of gain (14496-3 sp04 p219)
1500 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1501 SBRData *ch_data, const int e_a[2])
1504 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1505 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1507 for (e = 0; e < ch_data->bs_num_env; e++) {
1508 int delta = !((e == e_a[1]) || (e == e_a[0]));
1509 for (k = 0; k < sbr->n_lim; k++) {
1510 float gain_boost, gain_max;
1511 float sum[2] = { 0.0f, 0.0f };
1512 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1513 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1514 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1515 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1516 if (!sbr->s_mapped[e][m]) {
1517 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1518 ((1.0f + sbr->e_curr[e][m]) *
1519 (1.0f + sbr->q_mapped[e][m] * delta)));
1521 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1522 ((1.0f + sbr->e_curr[e][m]) *
1523 (1.0f + sbr->q_mapped[e][m])));
1526 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1527 sum[0] += sbr->e_origmapped[e][m];
1528 sum[1] += sbr->e_curr[e][m];
1530 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1531 gain_max = FFMIN(100000.f, gain_max);
1532 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1533 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1534 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1535 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1537 sum[0] = sum[1] = 0.0f;
1538 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1539 sum[0] += sbr->e_origmapped[e][m];
1540 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1541 + sbr->s_m[e][m] * sbr->s_m[e][m]
1542 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1544 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1545 gain_boost = FFMIN(1.584893192f, gain_boost);
1546 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1547 sbr->gain[e][m] *= gain_boost;
1548 sbr->q_m[e][m] *= gain_boost;
1549 sbr->s_m[e][m] *= gain_boost;
1555 /// Assembling HF Signals (14496-3 sp04 p220)
1556 static void sbr_hf_assemble(float Y1[38][64][2],
1557 const float X_high[64][40][2],
1558 SpectralBandReplication *sbr, SBRData *ch_data,
1562 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1563 const int kx = sbr->kx[1];
1564 const int m_max = sbr->m[1];
1565 static const float h_smooth[5] = {
1572 static const int8_t phi[2][4] = {
1573 { 1, 0, -1, 0}, // real
1574 { 0, 1, 0, -1}, // imaginary
1576 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1577 int indexnoise = ch_data->f_indexnoise;
1578 int indexsine = ch_data->f_indexsine;
1581 for (i = 0; i < h_SL; i++) {
1582 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1583 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1586 for (i = 0; i < 4; i++) {
1587 memcpy(g_temp[i + 2 * ch_data->t_env[0]],
1588 g_temp[i + 2 * ch_data->t_env_num_env_old],
1590 memcpy(q_temp[i + 2 * ch_data->t_env[0]],
1591 q_temp[i + 2 * ch_data->t_env_num_env_old],
1596 for (e = 0; e < ch_data->bs_num_env; e++) {
1597 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1598 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1599 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1603 for (e = 0; e < ch_data->bs_num_env; e++) {
1604 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1605 int phi_sign = (1 - 2*(kx & 1));
1606 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
1607 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
1608 float *g_filt, *q_filt;
1610 if (h_SL && e != e_a[0] && e != e_a[1]) {
1611 g_filt = g_filt_tab;
1612 q_filt = q_filt_tab;
1613 for (m = 0; m < m_max; m++) {
1614 const int idx1 = i + h_SL;
1617 for (j = 0; j <= h_SL; j++) {
1618 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
1619 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
1623 g_filt = g_temp[i + h_SL];
1627 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
1628 i + ENVELOPE_ADJUSTMENT_OFFSET);
1630 if (e != e_a[0] && e != e_a[1]) {
1631 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
1635 for (m = 0; m < m_max; m++) {
1637 sbr->s_m[e][m] * phi[0][indexsine];
1639 sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1640 phi_sign = -phi_sign;
1643 indexnoise = (indexnoise + m_max) & 0x1ff;
1644 indexsine = (indexsine + 1) & 3;
1647 ch_data->f_indexnoise = indexnoise;
1648 ch_data->f_indexsine = indexsine;
1651 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1654 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
1656 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1659 if (!sbr->kx_and_m_pushed) {
1660 sbr->kx[0] = sbr->kx[1];
1661 sbr->m[0] = sbr->m[1];
1663 sbr->kx_and_m_pushed = 0;
1667 sbr_dequant(sbr, id_aac);
1669 for (ch = 0; ch < nch; ch++) {
1670 /* decode channel */
1671 sbr_qmf_analysis(&ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1672 (float*)sbr->qmf_filter_scratch,
1673 sbr->data[ch].W, sbr->data[ch].Ypos);
1674 sbr_lf_gen(ac, sbr, sbr->X_low,
1675 (const float (*)[32][32][2]) sbr->data[ch].W,
1676 sbr->data[ch].Ypos);
1677 sbr->data[ch].Ypos ^= 1;
1679 sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,
1680 (const float (*)[40][2]) sbr->X_low, sbr->k[0]);
1681 sbr_chirp(sbr, &sbr->data[ch]);
1682 sbr_hf_gen(ac, sbr, sbr->X_high,
1683 (const float (*)[40][2]) sbr->X_low,
1684 (const float (*)[2]) sbr->alpha0,
1685 (const float (*)[2]) sbr->alpha1,
1686 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1687 sbr->data[ch].bs_num_env);
1690 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1692 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1693 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1694 sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1695 (const float (*)[40][2]) sbr->X_high,
1696 sbr, &sbr->data[ch],
1702 sbr_x_gen(sbr, sbr->X[ch],
1703 (const float (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1704 (const float (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos],
1705 (const float (*)[40][2]) sbr->X_low, ch);
1708 if (ac->oc[1].m4ac.ps == 1) {
1709 if (sbr->ps.start) {
1710 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1712 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1717 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
1718 L, sbr->X[0], sbr->qmf_filter_scratch,
1719 sbr->data[0].synthesis_filterbank_samples,
1720 &sbr->data[0].synthesis_filterbank_samples_offset,
1723 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
1724 R, sbr->X[1], sbr->qmf_filter_scratch,
1725 sbr->data[1].synthesis_filterbank_samples,
1726 &sbr->data[1].synthesis_filterbank_samples_offset,