2 * AAC Spectral Band Replication decoding functions
3 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
4 * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * AAC Spectral Band Replication decoding functions
26 * @author Robert Swain ( rob opendot cl )
32 #include "aacsbrdata.h"
36 #include "libavutil/libm.h"
37 #include "libavutil/avassert.h"
43 #define ENVELOPE_ADJUSTMENT_OFFSET 2
44 #define NOISE_FLOOR_OFFSET 6.0f
52 T_HUFFMAN_ENV_BAL_1_5DB,
53 F_HUFFMAN_ENV_BAL_1_5DB,
56 T_HUFFMAN_ENV_BAL_3_0DB,
57 F_HUFFMAN_ENV_BAL_3_0DB,
58 T_HUFFMAN_NOISE_3_0DB,
59 T_HUFFMAN_NOISE_BAL_3_0DB,
63 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
76 static VLC vlc_sbr[10];
77 static const int8_t vlc_sbr_lav[10] =
78 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
79 static const DECLARE_ALIGNED(16, float, zero64)[64];
81 #define SBR_INIT_VLC_STATIC(num, size) \
82 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
83 sbr_tmp[num].sbr_bits , 1, 1, \
84 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
87 #define SBR_VLC_ROW(name) \
88 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
90 av_cold void ff_aac_sbr_init(void)
94 const void *sbr_codes, *sbr_bits;
95 const unsigned int table_size, elem_size;
97 SBR_VLC_ROW(t_huffman_env_1_5dB),
98 SBR_VLC_ROW(f_huffman_env_1_5dB),
99 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
100 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
101 SBR_VLC_ROW(t_huffman_env_3_0dB),
102 SBR_VLC_ROW(f_huffman_env_3_0dB),
103 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
104 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
105 SBR_VLC_ROW(t_huffman_noise_3_0dB),
106 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
109 // SBR VLC table initialization
110 SBR_INIT_VLC_STATIC(0, 1098);
111 SBR_INIT_VLC_STATIC(1, 1092);
112 SBR_INIT_VLC_STATIC(2, 768);
113 SBR_INIT_VLC_STATIC(3, 1026);
114 SBR_INIT_VLC_STATIC(4, 1058);
115 SBR_INIT_VLC_STATIC(5, 1052);
116 SBR_INIT_VLC_STATIC(6, 544);
117 SBR_INIT_VLC_STATIC(7, 544);
118 SBR_INIT_VLC_STATIC(8, 592);
119 SBR_INIT_VLC_STATIC(9, 512);
121 for (n = 1; n < 320; n++)
122 sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
123 sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
124 sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
126 for (n = 0; n < 320; n++)
127 sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
132 /** Places SBR in pure upsampling mode. */
133 static void sbr_turnoff(SpectralBandReplication *sbr) {
135 // Init defults used in pure upsampling mode
136 sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
138 // Reset values for first SBR header
139 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
140 memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
143 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
146 if(sbr->mdct.mdct_bits)
148 sbr->kx[0] = sbr->kx[1];
150 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
151 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
152 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
153 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
154 * and scale back down at synthesis. */
155 mdct_scale = ac->avctx->sample_fmt == AV_SAMPLE_FMT_FLT ? 32768.0f : 1.0f;
156 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * mdct_scale));
157 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * mdct_scale);
158 ff_ps_ctx_init(&sbr->ps);
159 ff_sbrdsp_init(&sbr->dsp);
162 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
164 ff_mdct_end(&sbr->mdct);
165 ff_mdct_end(&sbr->mdct_ana);
168 static int qsort_comparison_function_int16(const void *a, const void *b)
170 return *(const int16_t *)a - *(const int16_t *)b;
173 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
176 for (i = 0; i <= last_el; i++)
177 if (table[i] == needle)
182 /// Limiter Frequency Band Table (14496-3 sp04 p198)
183 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
186 if (sbr->bs_limiter_bands > 0) {
187 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
188 1.18509277094158210129f, //2^(0.49/2)
189 1.11987160404675912501f }; //2^(0.49/3)
190 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
191 int16_t patch_borders[7];
192 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
194 patch_borders[0] = sbr->kx[1];
195 for (k = 1; k <= sbr->num_patches; k++)
196 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
198 memcpy(sbr->f_tablelim, sbr->f_tablelow,
199 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
200 if (sbr->num_patches > 1)
201 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
202 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
204 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
205 sizeof(sbr->f_tablelim[0]),
206 qsort_comparison_function_int16);
208 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
209 while (out < sbr->f_tablelim + sbr->n_lim) {
210 if (*in >= *out * lim_bands_per_octave_warped) {
212 } else if (*in == *out ||
213 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
216 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
224 sbr->f_tablelim[0] = sbr->f_tablelow[0];
225 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
230 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
232 unsigned int cnt = get_bits_count(gb);
233 uint8_t bs_header_extra_1;
234 uint8_t bs_header_extra_2;
235 int old_bs_limiter_bands = sbr->bs_limiter_bands;
236 SpectrumParameters old_spectrum_params;
240 // Save last spectrum parameters variables to compare to new ones
241 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
243 sbr->bs_amp_res_header = get_bits1(gb);
244 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
245 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
246 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
247 skip_bits(gb, 2); // bs_reserved
249 bs_header_extra_1 = get_bits1(gb);
250 bs_header_extra_2 = get_bits1(gb);
252 if (bs_header_extra_1) {
253 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
254 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
255 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
257 sbr->spectrum_params.bs_freq_scale = 2;
258 sbr->spectrum_params.bs_alter_scale = 1;
259 sbr->spectrum_params.bs_noise_bands = 2;
262 // Check if spectrum parameters changed
263 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
266 if (bs_header_extra_2) {
267 sbr->bs_limiter_bands = get_bits(gb, 2);
268 sbr->bs_limiter_gains = get_bits(gb, 2);
269 sbr->bs_interpol_freq = get_bits1(gb);
270 sbr->bs_smoothing_mode = get_bits1(gb);
272 sbr->bs_limiter_bands = 2;
273 sbr->bs_limiter_gains = 2;
274 sbr->bs_interpol_freq = 1;
275 sbr->bs_smoothing_mode = 1;
278 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
279 sbr_make_f_tablelim(sbr);
281 return get_bits_count(gb) - cnt;
284 static int array_min_int16(const int16_t *array, int nel)
286 int i, min = array[0];
287 for (i = 1; i < nel; i++)
288 min = FFMIN(array[i], min);
292 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
294 int k, previous, present;
297 base = powf((float)stop / start, 1.0f / num_bands);
301 for (k = 0; k < num_bands-1; k++) {
303 present = lrintf(prod);
304 bands[k] = present - previous;
307 bands[num_bands-1] = stop - previous;
310 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
312 // Requirements (14496-3 sp04 p205)
314 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
317 if (bs_xover_band >= n_master) {
318 av_log(avctx, AV_LOG_ERROR,
319 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
326 /// Master Frequency Band Table (14496-3 sp04 p194)
327 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
328 SpectrumParameters *spectrum)
330 unsigned int temp, max_qmf_subbands;
331 unsigned int start_min, stop_min;
333 const int8_t *sbr_offset_ptr;
336 if (sbr->sample_rate < 32000) {
338 } else if (sbr->sample_rate < 64000) {
343 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
344 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
346 switch (sbr->sample_rate) {
348 sbr_offset_ptr = sbr_offset[0];
351 sbr_offset_ptr = sbr_offset[1];
354 sbr_offset_ptr = sbr_offset[2];
357 sbr_offset_ptr = sbr_offset[3];
359 case 44100: case 48000: case 64000:
360 sbr_offset_ptr = sbr_offset[4];
362 case 88200: case 96000: case 128000: case 176400: case 192000:
363 sbr_offset_ptr = sbr_offset[5];
366 av_log(ac->avctx, AV_LOG_ERROR,
367 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
371 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
373 if (spectrum->bs_stop_freq < 14) {
374 sbr->k[2] = stop_min;
375 make_bands(stop_dk, stop_min, 64, 13);
376 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
377 for (k = 0; k < spectrum->bs_stop_freq; k++)
378 sbr->k[2] += stop_dk[k];
379 } else if (spectrum->bs_stop_freq == 14) {
380 sbr->k[2] = 2*sbr->k[0];
381 } else if (spectrum->bs_stop_freq == 15) {
382 sbr->k[2] = 3*sbr->k[0];
384 av_log(ac->avctx, AV_LOG_ERROR,
385 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
388 sbr->k[2] = FFMIN(64, sbr->k[2]);
390 // Requirements (14496-3 sp04 p205)
391 if (sbr->sample_rate <= 32000) {
392 max_qmf_subbands = 48;
393 } else if (sbr->sample_rate == 44100) {
394 max_qmf_subbands = 35;
395 } else if (sbr->sample_rate >= 48000)
396 max_qmf_subbands = 32;
398 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
399 av_log(ac->avctx, AV_LOG_ERROR,
400 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
404 if (!spectrum->bs_freq_scale) {
407 dk = spectrum->bs_alter_scale + 1;
408 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
409 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
412 for (k = 1; k <= sbr->n_master; k++)
413 sbr->f_master[k] = dk;
415 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
418 sbr->f_master[2]-= (k2diff < -1);
420 sbr->f_master[sbr->n_master]++;
423 sbr->f_master[0] = sbr->k[0];
424 for (k = 1; k <= sbr->n_master; k++)
425 sbr->f_master[k] += sbr->f_master[k - 1];
428 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
429 int two_regions, num_bands_0;
430 int vdk0_max, vdk1_min;
433 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
435 sbr->k[1] = 2 * sbr->k[0];
438 sbr->k[1] = sbr->k[2];
441 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
443 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
444 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
450 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
452 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
453 vdk0_max = vk0[num_bands_0];
456 for (k = 1; k <= num_bands_0; k++) {
457 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
458 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
466 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
467 : 1.0f; // bs_alter_scale = {0,1}
468 int num_bands_1 = lrintf(half_bands * invwarp *
469 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
471 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
473 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
475 if (vdk1_min < vdk0_max) {
477 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
478 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
480 vk1[num_bands_1] -= change;
483 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
486 for (k = 1; k <= num_bands_1; k++) {
487 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
488 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
494 sbr->n_master = num_bands_0 + num_bands_1;
495 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
497 memcpy(&sbr->f_master[0], vk0,
498 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
499 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
500 num_bands_1 * sizeof(sbr->f_master[0]));
503 sbr->n_master = num_bands_0;
504 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
506 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
513 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
514 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
518 int usb = sbr->kx[1];
519 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
521 sbr->num_patches = 0;
523 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
524 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
530 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
531 sb = sbr->f_master[i];
532 odd = (sb + sbr->k[0]) & 1;
535 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
536 // After this check the final number of patches can still be six which is
537 // illegal however the Coding Technologies decoder check stream has a final
538 // count of 6 patches
539 if (sbr->num_patches > 5) {
540 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
544 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
545 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
547 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
554 if (sbr->f_master[k] - sb < 3)
556 } while (sb != sbr->kx[1] + sbr->m[1]);
558 if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
564 /// Derived Frequency Band Tables (14496-3 sp04 p197)
565 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
569 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
570 sbr->n[0] = (sbr->n[1] + 1) >> 1;
572 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
573 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
574 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
575 sbr->kx[1] = sbr->f_tablehigh[0];
577 // Requirements (14496-3 sp04 p205)
578 if (sbr->kx[1] + sbr->m[1] > 64) {
579 av_log(ac->avctx, AV_LOG_ERROR,
580 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
583 if (sbr->kx[1] > 32) {
584 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
588 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
589 temp = sbr->n[1] & 1;
590 for (k = 1; k <= sbr->n[0]; k++)
591 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
593 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
594 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
596 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
600 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
602 for (k = 1; k <= sbr->n_q; k++) {
603 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
604 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
607 if (sbr_hf_calc_npatches(ac, sbr) < 0)
610 sbr_make_f_tablelim(sbr);
612 sbr->data[0].f_indexnoise = 0;
613 sbr->data[1].f_indexnoise = 0;
618 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
622 for (i = 0; i < elements; i++) {
623 vec[i] = get_bits1(gb);
627 /** ceil(log2(index+1)) */
628 static const int8_t ceil_log2[] = {
632 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
633 GetBitContext *gb, SBRData *ch_data)
636 unsigned bs_pointer = 0;
637 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
638 int abs_bord_trail = 16;
639 int num_rel_lead, num_rel_trail;
640 unsigned bs_num_env_old = ch_data->bs_num_env;
642 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
643 ch_data->bs_amp_res = sbr->bs_amp_res_header;
644 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
646 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
648 ch_data->bs_num_env = 1 << get_bits(gb, 2);
649 num_rel_lead = ch_data->bs_num_env - 1;
650 if (ch_data->bs_num_env == 1)
651 ch_data->bs_amp_res = 0;
653 if (ch_data->bs_num_env > 4) {
654 av_log(ac->avctx, AV_LOG_ERROR,
655 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
656 ch_data->bs_num_env);
660 ch_data->t_env[0] = 0;
661 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
663 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
665 for (i = 0; i < num_rel_lead; i++)
666 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
668 ch_data->bs_freq_res[1] = get_bits1(gb);
669 for (i = 1; i < ch_data->bs_num_env; i++)
670 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
673 abs_bord_trail += get_bits(gb, 2);
674 num_rel_trail = get_bits(gb, 2);
675 ch_data->bs_num_env = num_rel_trail + 1;
676 ch_data->t_env[0] = 0;
677 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
679 for (i = 0; i < num_rel_trail; i++)
680 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
681 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
683 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
685 for (i = 0; i < ch_data->bs_num_env; i++)
686 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
689 ch_data->t_env[0] = get_bits(gb, 2);
690 num_rel_lead = get_bits(gb, 2);
691 ch_data->bs_num_env = num_rel_lead + 1;
692 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
694 for (i = 0; i < num_rel_lead; i++)
695 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
697 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
699 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
702 ch_data->t_env[0] = get_bits(gb, 2);
703 abs_bord_trail += get_bits(gb, 2);
704 num_rel_lead = get_bits(gb, 2);
705 num_rel_trail = get_bits(gb, 2);
706 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
708 if (ch_data->bs_num_env > 5) {
709 av_log(ac->avctx, AV_LOG_ERROR,
710 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
711 ch_data->bs_num_env);
715 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
717 for (i = 0; i < num_rel_lead; i++)
718 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
719 for (i = 0; i < num_rel_trail; i++)
720 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
721 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
723 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
725 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
729 if (bs_pointer > ch_data->bs_num_env + 1) {
730 av_log(ac->avctx, AV_LOG_ERROR,
731 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
736 for (i = 1; i <= ch_data->bs_num_env; i++) {
737 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
738 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
743 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
745 ch_data->t_q[0] = ch_data->t_env[0];
746 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
747 if (ch_data->bs_num_noise > 1) {
749 if (ch_data->bs_frame_class == FIXFIX) {
750 idx = ch_data->bs_num_env >> 1;
751 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
752 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
756 else if (bs_pointer == 1)
757 idx = ch_data->bs_num_env - 1;
758 else // bs_pointer > 1
759 idx = bs_pointer - 1;
761 ch_data->t_q[1] = ch_data->t_env[idx];
764 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
765 ch_data->e_a[1] = -1;
766 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
767 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
768 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
769 ch_data->e_a[1] = bs_pointer - 1;
774 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
775 //These variables are saved from the previous frame rather than copied
776 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
777 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
778 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
780 //These variables are read from the bitstream and therefore copied
781 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
782 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
783 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
784 dst->bs_num_env = src->bs_num_env;
785 dst->bs_amp_res = src->bs_amp_res;
786 dst->bs_num_noise = src->bs_num_noise;
787 dst->bs_frame_class = src->bs_frame_class;
788 dst->e_a[1] = src->e_a[1];
791 /// Read how the envelope and noise floor data is delta coded
792 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
795 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
796 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
799 /// Read inverse filtering data
800 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
805 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
806 for (i = 0; i < sbr->n_q; i++)
807 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
810 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
811 SBRData *ch_data, int ch)
815 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
817 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
818 const int odd = sbr->n[1] & 1;
820 if (sbr->bs_coupling && ch) {
821 if (ch_data->bs_amp_res) {
823 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
824 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
825 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
826 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
829 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
830 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
831 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
832 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
835 if (ch_data->bs_amp_res) {
837 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
838 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
839 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
840 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
843 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
844 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
845 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
846 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
850 for (i = 0; i < ch_data->bs_num_env; i++) {
851 if (ch_data->bs_df_env[i]) {
852 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
853 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
854 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
855 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
856 } else if (ch_data->bs_freq_res[i + 1]) {
857 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
858 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
859 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
862 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
863 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
864 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
868 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
869 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
870 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);
874 //assign 0th elements of env_facs from last elements
875 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
876 sizeof(ch_data->env_facs[0]));
879 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
880 SBRData *ch_data, int ch)
883 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
885 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
887 if (sbr->bs_coupling && ch) {
888 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
889 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
890 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
891 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
893 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
894 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
895 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
896 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
899 for (i = 0; i < ch_data->bs_num_noise; i++) {
900 if (ch_data->bs_df_noise[i]) {
901 for (j = 0; j < sbr->n_q; j++)
902 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
904 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
905 for (j = 1; j < sbr->n_q; j++)
906 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);
910 //assign 0th elements of noise_facs from last elements
911 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
912 sizeof(ch_data->noise_facs[0]));
915 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
917 int bs_extension_id, int *num_bits_left)
919 switch (bs_extension_id) {
920 case EXTENSION_ID_PS:
921 if (!ac->oc[1].m4ac.ps) {
922 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
923 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
927 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
929 av_log_missing_feature(ac->avctx, "Parametric Stereo is", 0);
930 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
936 // some files contain 0-padding
937 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
938 av_log_missing_feature(ac->avctx, "Reserved SBR extensions are", 1);
939 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
945 static int read_sbr_single_channel_element(AACContext *ac,
946 SpectralBandReplication *sbr,
949 if (get_bits1(gb)) // bs_data_extra
950 skip_bits(gb, 4); // bs_reserved
952 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
954 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
955 read_sbr_invf(sbr, gb, &sbr->data[0]);
956 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
957 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
959 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
960 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
965 static int read_sbr_channel_pair_element(AACContext *ac,
966 SpectralBandReplication *sbr,
969 if (get_bits1(gb)) // bs_data_extra
970 skip_bits(gb, 8); // bs_reserved
972 if ((sbr->bs_coupling = get_bits1(gb))) {
973 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
975 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
976 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
977 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
978 read_sbr_invf(sbr, gb, &sbr->data[0]);
979 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
980 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
981 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
982 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
983 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
984 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
986 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
987 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
989 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
990 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
991 read_sbr_invf(sbr, gb, &sbr->data[0]);
992 read_sbr_invf(sbr, gb, &sbr->data[1]);
993 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
994 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
995 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
996 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
999 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
1000 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
1001 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
1002 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
1007 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
1008 GetBitContext *gb, int id_aac)
1010 unsigned int cnt = get_bits_count(gb);
1012 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
1013 if (read_sbr_single_channel_element(ac, sbr, gb)) {
1015 return get_bits_count(gb) - cnt;
1017 } else if (id_aac == TYPE_CPE) {
1018 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1020 return get_bits_count(gb) - cnt;
1023 av_log(ac->avctx, AV_LOG_ERROR,
1024 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1026 return get_bits_count(gb) - cnt;
1028 if (get_bits1(gb)) { // bs_extended_data
1029 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1030 if (num_bits_left == 15)
1031 num_bits_left += get_bits(gb, 8); // bs_esc_count
1033 num_bits_left <<= 3;
1034 while (num_bits_left > 7) {
1036 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1038 if (num_bits_left < 0) {
1039 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1041 if (num_bits_left > 0)
1042 skip_bits(gb, num_bits_left);
1045 return get_bits_count(gb) - cnt;
1048 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1051 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1053 err = sbr_make_f_derived(ac, sbr);
1055 av_log(ac->avctx, AV_LOG_ERROR,
1056 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1062 * Decode Spectral Band Replication extension data; reference: table 4.55.
1064 * @param crc flag indicating the presence of CRC checksum
1065 * @param cnt length of TYPE_FIL syntactic element in bytes
1067 * @return Returns number of bytes consumed from the TYPE_FIL element.
1069 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1070 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1072 unsigned int num_sbr_bits = 0, num_align_bits;
1073 unsigned bytes_read;
1074 GetBitContext gbc = *gb_host, *gb = &gbc;
1075 skip_bits_long(gb_host, cnt*8 - 4);
1079 if (!sbr->sample_rate)
1080 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1081 if (!ac->oc[1].m4ac.ext_sample_rate)
1082 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
1085 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1089 //Save some state from the previous frame.
1090 sbr->kx[0] = sbr->kx[1];
1091 sbr->m[0] = sbr->m[1];
1092 sbr->kx_and_m_pushed = 1;
1095 if (get_bits1(gb)) // bs_header_flag
1096 num_sbr_bits += read_sbr_header(sbr, gb);
1102 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1104 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1105 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1107 if (bytes_read > cnt) {
1108 av_log(ac->avctx, AV_LOG_ERROR,
1109 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1114 /// Dequantization and stereo decoding (14496-3 sp04 p203)
1115 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1120 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1121 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1122 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1123 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1124 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1125 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1126 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1127 float fac = temp1 / (1.0f + temp2);
1128 sbr->data[0].env_facs[e][k] = fac;
1129 sbr->data[1].env_facs[e][k] = fac * temp2;
1132 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1133 for (k = 0; k < sbr->n_q; k++) {
1134 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1135 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1136 float fac = temp1 / (1.0f + temp2);
1137 sbr->data[0].noise_facs[e][k] = fac;
1138 sbr->data[1].noise_facs[e][k] = fac * temp2;
1141 } else { // SCE or one non-coupled CPE
1142 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1143 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1144 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1145 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1146 sbr->data[ch].env_facs[e][k] =
1147 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1148 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1149 for (k = 0; k < sbr->n_q; k++)
1150 sbr->data[ch].noise_facs[e][k] =
1151 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1157 * Analysis QMF Bank (14496-3 sp04 p206)
1159 * @param x pointer to the beginning of the first sample window
1160 * @param W array of complex-valued samples split into subbands
1162 static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct,
1163 SBRDSPContext *sbrdsp, const float *in, float *x,
1164 float z[320], float W[2][32][32][2])
1167 memcpy(W[0], W[1], sizeof(W[0]));
1168 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1169 memcpy(x+288, in, 1024*sizeof(x[0]));
1170 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1171 // are not supported
1172 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1174 sbrdsp->qmf_pre_shuffle(z);
1175 mdct->imdct_half(mdct, z, z+64);
1176 sbrdsp->qmf_post_shuffle(W[1][i], z);
1182 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1183 * (14496-3 sp04 p206)
1185 static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1186 SBRDSPContext *sbrdsp,
1187 float *out, float X[2][38][64],
1188 float mdct_buf[2][64],
1189 float *v0, int *v_off, const unsigned int div)
1192 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1193 const int step = 128 >> div;
1195 for (i = 0; i < 32; i++) {
1196 if (*v_off < step) {
1197 int saved_samples = (1280 - 128) >> div;
1198 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1199 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1205 for (n = 0; n < 32; n++) {
1206 X[0][i][ n] = -X[0][i][n];
1207 X[0][i][32+n] = X[1][i][31-n];
1209 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1210 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1212 sbrdsp->neg_odd_64(X[1][i]);
1213 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1214 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1215 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1217 dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1218 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1219 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1220 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1221 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1222 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1223 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1224 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1225 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1226 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1231 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1232 * (14496-3 sp04 p214)
1233 * Warning: This routine does not seem numerically stable.
1235 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
1236 float (*alpha0)[2], float (*alpha1)[2],
1237 const float X_low[32][40][2], int k0)
1240 for (k = 0; k < k0; k++) {
1241 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
1244 dsp->autocorrelate(X_low[k], phi);
1246 dk = phi[2][1][0] * phi[1][0][0] -
1247 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1253 float temp_real, temp_im;
1254 temp_real = phi[0][0][0] * phi[1][1][0] -
1255 phi[0][0][1] * phi[1][1][1] -
1256 phi[0][1][0] * phi[1][0][0];
1257 temp_im = phi[0][0][0] * phi[1][1][1] +
1258 phi[0][0][1] * phi[1][1][0] -
1259 phi[0][1][1] * phi[1][0][0];
1261 alpha1[k][0] = temp_real / dk;
1262 alpha1[k][1] = temp_im / dk;
1265 if (!phi[1][0][0]) {
1269 float temp_real, temp_im;
1270 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1271 alpha1[k][1] * phi[1][1][1];
1272 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1273 alpha1[k][0] * phi[1][1][1];
1275 alpha0[k][0] = -temp_real / phi[1][0][0];
1276 alpha0[k][1] = -temp_im / phi[1][0][0];
1279 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1280 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1289 /// Chirp Factors (14496-3 sp04 p214)
1290 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1294 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1296 for (i = 0; i < sbr->n_q; i++) {
1297 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1300 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1302 if (new_bw < ch_data->bw_array[i]) {
1303 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1305 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1306 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1310 /// Generate the subband filtered lowband
1311 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1312 float X_low[32][40][2], const float W[2][32][32][2])
1315 const int t_HFGen = 8;
1317 memset(X_low, 0, 32*sizeof(*X_low));
1318 for (k = 0; k < sbr->kx[1]; k++) {
1319 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1320 X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1321 X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1324 for (k = 0; k < sbr->kx[0]; k++) {
1325 for (i = 0; i < t_HFGen; i++) {
1326 X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1327 X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1333 /// High Frequency Generator (14496-3 sp04 p215)
1334 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1335 float X_high[64][40][2], const float X_low[32][40][2],
1336 const float (*alpha0)[2], const float (*alpha1)[2],
1337 const float bw_array[5], const uint8_t *t_env,
1343 for (j = 0; j < sbr->num_patches; j++) {
1344 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1345 const int p = sbr->patch_start_subband[j] + x;
1346 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1351 av_log(ac->avctx, AV_LOG_ERROR,
1352 "ERROR : no subband found for frequency %d\n", k);
1356 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1357 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1358 alpha0[p], alpha1[p], bw_array[g],
1359 2 * t_env[0], 2 * t_env[bs_num_env]);
1362 if (k < sbr->m[1] + sbr->kx[1])
1363 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1368 /// Generate the subband filtered lowband
1369 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1370 const float Y0[38][64][2], const float Y1[38][64][2],
1371 const float X_low[32][40][2], int ch)
1375 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1376 memset(X, 0, 2*sizeof(*X));
1377 for (k = 0; k < sbr->kx[0]; k++) {
1378 for (i = 0; i < i_Temp; i++) {
1379 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1380 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1383 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1384 for (i = 0; i < i_Temp; i++) {
1385 X[0][i][k] = Y0[i + i_f][k][0];
1386 X[1][i][k] = Y0[i + i_f][k][1];
1390 for (k = 0; k < sbr->kx[1]; k++) {
1391 for (i = i_Temp; i < 38; i++) {
1392 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1393 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1396 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1397 for (i = i_Temp; i < i_f; i++) {
1398 X[0][i][k] = Y1[i][k][0];
1399 X[1][i][k] = Y1[i][k][1];
1405 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1406 * (14496-3 sp04 p217)
1408 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1409 SBRData *ch_data, int e_a[2])
1413 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1414 for (e = 0; e < ch_data->bs_num_env; e++) {
1415 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1416 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1419 if (sbr->kx[1] != table[0]) {
1420 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
1421 "Derived frequency tables were not regenerated.\n");
1425 for (i = 0; i < ilim; i++)
1426 for (m = table[i]; m < table[i + 1]; m++)
1427 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1429 // ch_data->bs_num_noise > 1 => 2 noise floors
1430 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1431 for (i = 0; i < sbr->n_q; i++)
1432 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1433 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1435 for (i = 0; i < sbr->n[1]; i++) {
1436 if (ch_data->bs_add_harmonic_flag) {
1437 const unsigned int m_midpoint =
1438 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1440 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1441 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1445 for (i = 0; i < ilim; i++) {
1446 int additional_sinusoid_present = 0;
1447 for (m = table[i]; m < table[i + 1]; m++) {
1448 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1449 additional_sinusoid_present = 1;
1453 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1454 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1458 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1462 /// Estimation of current envelope (14496-3 sp04 p218)
1463 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1464 SpectralBandReplication *sbr, SBRData *ch_data)
1467 int kx1 = sbr->kx[1];
1469 if (sbr->bs_interpol_freq) {
1470 for (e = 0; e < ch_data->bs_num_env; e++) {
1471 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1472 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1473 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1475 for (m = 0; m < sbr->m[1]; m++) {
1476 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1477 e_curr[e][m] = sum * recip_env_size;
1483 for (e = 0; e < ch_data->bs_num_env; e++) {
1484 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1485 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1486 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1487 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1489 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1491 const int den = env_size * (table[p + 1] - table[p]);
1493 for (k = table[p]; k < table[p + 1]; k++) {
1494 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1497 for (k = table[p]; k < table[p + 1]; k++) {
1498 e_curr[e][k - kx1] = sum;
1506 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1507 * and Calculation of gain (14496-3 sp04 p219)
1509 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1510 SBRData *ch_data, const int e_a[2])
1513 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1514 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1516 for (e = 0; e < ch_data->bs_num_env; e++) {
1517 int delta = !((e == e_a[1]) || (e == e_a[0]));
1518 for (k = 0; k < sbr->n_lim; k++) {
1519 float gain_boost, gain_max;
1520 float sum[2] = { 0.0f, 0.0f };
1521 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1522 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1523 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1524 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1525 if (!sbr->s_mapped[e][m]) {
1526 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1527 ((1.0f + sbr->e_curr[e][m]) *
1528 (1.0f + sbr->q_mapped[e][m] * delta)));
1530 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1531 ((1.0f + sbr->e_curr[e][m]) *
1532 (1.0f + sbr->q_mapped[e][m])));
1535 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1536 sum[0] += sbr->e_origmapped[e][m];
1537 sum[1] += sbr->e_curr[e][m];
1539 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1540 gain_max = FFMIN(100000.f, gain_max);
1541 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1542 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1543 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1544 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1546 sum[0] = sum[1] = 0.0f;
1547 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1548 sum[0] += sbr->e_origmapped[e][m];
1549 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1550 + sbr->s_m[e][m] * sbr->s_m[e][m]
1551 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1553 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1554 gain_boost = FFMIN(1.584893192f, gain_boost);
1555 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1556 sbr->gain[e][m] *= gain_boost;
1557 sbr->q_m[e][m] *= gain_boost;
1558 sbr->s_m[e][m] *= gain_boost;
1564 /// Assembling HF Signals (14496-3 sp04 p220)
1565 static void sbr_hf_assemble(float Y1[38][64][2],
1566 const float X_high[64][40][2],
1567 SpectralBandReplication *sbr, SBRData *ch_data,
1571 const int h_SL = 4 * !sbr->bs_smoothing_mode;
1572 const int kx = sbr->kx[1];
1573 const int m_max = sbr->m[1];
1574 static const float h_smooth[5] = {
1581 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1582 int indexnoise = ch_data->f_indexnoise;
1583 int indexsine = ch_data->f_indexsine;
1586 for (i = 0; i < h_SL; i++) {
1587 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1588 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1591 memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1592 memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1595 for (e = 0; e < ch_data->bs_num_env; e++) {
1596 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1597 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1598 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1602 for (e = 0; e < ch_data->bs_num_env; e++) {
1603 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1604 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
1605 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
1606 float *g_filt, *q_filt;
1608 if (h_SL && e != e_a[0] && e != e_a[1]) {
1609 g_filt = g_filt_tab;
1610 q_filt = q_filt_tab;
1611 for (m = 0; m < m_max; m++) {
1612 const int idx1 = i + h_SL;
1615 for (j = 0; j <= h_SL; j++) {
1616 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
1617 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
1621 g_filt = g_temp[i + h_SL];
1625 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
1626 i + ENVELOPE_ADJUSTMENT_OFFSET);
1628 if (e != e_a[0] && e != e_a[1]) {
1629 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
1633 int idx = indexsine&1;
1634 int A = (1-((indexsine+(kx & 1))&2));
1635 int B = (A^(-idx)) + idx;
1636 float *out = &Y1[i][kx][idx];
1637 float *in = sbr->s_m[e];
1638 for (m = 0; m+1 < m_max; m+=2) {
1639 out[2*m ] += in[m ] * A;
1640 out[2*m+2] += in[m+1] * B;
1643 out[2*m ] += in[m ] * A;
1645 indexnoise = (indexnoise + m_max) & 0x1ff;
1646 indexsine = (indexsine + 1) & 3;
1649 ch_data->f_indexnoise = indexnoise;
1650 ch_data->f_indexsine = indexsine;
1653 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1656 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
1658 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1661 if (!sbr->kx_and_m_pushed) {
1662 sbr->kx[0] = sbr->kx[1];
1663 sbr->m[0] = sbr->m[1];
1665 sbr->kx_and_m_pushed = 0;
1669 sbr_dequant(sbr, id_aac);
1671 for (ch = 0; ch < nch; ch++) {
1672 /* decode channel */
1673 sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1674 (float*)sbr->qmf_filter_scratch,
1676 sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1677 sbr->data[ch].Ypos ^= 1;
1679 sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1680 sbr_chirp(sbr, &sbr->data[ch]);
1681 sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1682 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1683 sbr->data[ch].bs_num_env);
1686 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1688 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1689 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1690 sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1691 sbr->X_high, sbr, &sbr->data[ch],
1697 sbr_x_gen(sbr, sbr->X[ch],
1698 sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1699 sbr->data[ch].Y[ sbr->data[ch].Ypos],
1703 if (ac->oc[1].m4ac.ps == 1) {
1704 if (sbr->ps.start) {
1705 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1707 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1712 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, &sbr->dsp, L, sbr->X[0], sbr->qmf_filter_scratch,
1713 sbr->data[0].synthesis_filterbank_samples,
1714 &sbr->data[0].synthesis_filterbank_samples_offset,
1717 sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, &sbr->dsp, R, sbr->X[1], sbr->qmf_filter_scratch,
1718 sbr->data[1].synthesis_filterbank_samples,
1719 &sbr->data[1].synthesis_filterbank_samples_offset,