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>
8 * MIPS Technologies, Inc., California.
10 * This file is part of FFmpeg.
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 * AAC Spectral Band Replication decoding functions
30 * @author Robert Swain ( rob opendot cl )
31 * @author Stanislav Ocovaj ( stanislav.ocovaj@imgtec.com )
32 * @author Zoran Basaric ( zoran.basaric@imgtec.com )
35 av_cold void AAC_RENAME(ff_aac_sbr_init)(void)
38 const void *sbr_codes, *sbr_bits;
39 const unsigned int table_size, elem_size;
41 SBR_VLC_ROW(t_huffman_env_1_5dB),
42 SBR_VLC_ROW(f_huffman_env_1_5dB),
43 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
44 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
45 SBR_VLC_ROW(t_huffman_env_3_0dB),
46 SBR_VLC_ROW(f_huffman_env_3_0dB),
47 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
48 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
49 SBR_VLC_ROW(t_huffman_noise_3_0dB),
50 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
53 // SBR VLC table initialization
54 SBR_INIT_VLC_STATIC(0, 1098);
55 SBR_INIT_VLC_STATIC(1, 1092);
56 SBR_INIT_VLC_STATIC(2, 768);
57 SBR_INIT_VLC_STATIC(3, 1026);
58 SBR_INIT_VLC_STATIC(4, 1058);
59 SBR_INIT_VLC_STATIC(5, 1052);
60 SBR_INIT_VLC_STATIC(6, 544);
61 SBR_INIT_VLC_STATIC(7, 544);
62 SBR_INIT_VLC_STATIC(8, 592);
63 SBR_INIT_VLC_STATIC(9, 512);
67 AAC_RENAME(ff_ps_init)();
70 /** Places SBR in pure upsampling mode. */
71 static void sbr_turnoff(SpectralBandReplication *sbr) {
73 // Init defults used in pure upsampling mode
74 sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
76 // Reset values for first SBR header
77 sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
78 memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
81 av_cold void AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr)
83 if(sbr->mdct.mdct_bits)
85 sbr->kx[0] = sbr->kx[1];
87 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
88 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
89 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
90 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
91 * and scale back down at synthesis. */
92 AAC_RENAME_32(ff_mdct_init)(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));
93 AAC_RENAME_32(ff_mdct_init)(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
94 AAC_RENAME(ff_ps_ctx_init)(&sbr->ps);
95 AAC_RENAME(ff_sbrdsp_init)(&sbr->dsp);
96 aacsbr_func_ptr_init(&sbr->c);
99 av_cold void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr)
101 AAC_RENAME_32(ff_mdct_end)(&sbr->mdct);
102 AAC_RENAME_32(ff_mdct_end)(&sbr->mdct_ana);
105 static int qsort_comparison_function_int16(const void *a, const void *b)
107 return *(const int16_t *)a - *(const int16_t *)b;
110 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
113 for (i = 0; i <= last_el; i++)
114 if (table[i] == needle)
119 /// Limiter Frequency Band Table (14496-3 sp04 p198)
120 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
123 if (sbr->bs_limiter_bands > 0) {
124 static const INTFLOAT bands_warped[3] = { Q23(1.32715174233856803909f), //2^(0.49/1.2)
125 Q23(1.18509277094158210129f), //2^(0.49/2)
126 Q23(1.11987160404675912501f) }; //2^(0.49/3)
127 const INTFLOAT lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
128 int16_t patch_borders[7];
129 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
131 patch_borders[0] = sbr->kx[1];
132 for (k = 1; k <= sbr->num_patches; k++)
133 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
135 memcpy(sbr->f_tablelim, sbr->f_tablelow,
136 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
137 if (sbr->num_patches > 1)
138 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
139 (sbr->num_patches - 1) * sizeof(patch_borders[0]));
141 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
142 sizeof(sbr->f_tablelim[0]),
143 qsort_comparison_function_int16);
145 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
146 while (out < sbr->f_tablelim + sbr->n_lim) {
148 if ((*in << 23) >= *out * lim_bands_per_octave_warped) {
150 if (*in >= *out * lim_bands_per_octave_warped) {
151 #endif /* USE_FIXED */
153 } else if (*in == *out ||
154 !in_table_int16(patch_borders, sbr->num_patches, *in)) {
157 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
165 sbr->f_tablelim[0] = sbr->f_tablelow[0];
166 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
171 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
173 unsigned int cnt = get_bits_count(gb);
174 uint8_t bs_header_extra_1;
175 uint8_t bs_header_extra_2;
176 int old_bs_limiter_bands = sbr->bs_limiter_bands;
177 SpectrumParameters old_spectrum_params;
181 // Save last spectrum parameters variables to compare to new ones
182 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
184 sbr->bs_amp_res_header = get_bits1(gb);
185 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
186 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
187 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
188 skip_bits(gb, 2); // bs_reserved
190 bs_header_extra_1 = get_bits1(gb);
191 bs_header_extra_2 = get_bits1(gb);
193 if (bs_header_extra_1) {
194 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
195 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
196 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
198 sbr->spectrum_params.bs_freq_scale = 2;
199 sbr->spectrum_params.bs_alter_scale = 1;
200 sbr->spectrum_params.bs_noise_bands = 2;
203 // Check if spectrum parameters changed
204 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
207 if (bs_header_extra_2) {
208 sbr->bs_limiter_bands = get_bits(gb, 2);
209 sbr->bs_limiter_gains = get_bits(gb, 2);
210 sbr->bs_interpol_freq = get_bits1(gb);
211 sbr->bs_smoothing_mode = get_bits1(gb);
213 sbr->bs_limiter_bands = 2;
214 sbr->bs_limiter_gains = 2;
215 sbr->bs_interpol_freq = 1;
216 sbr->bs_smoothing_mode = 1;
219 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
220 sbr_make_f_tablelim(sbr);
222 return get_bits_count(gb) - cnt;
225 static int array_min_int16(const int16_t *array, int nel)
227 int i, min = array[0];
228 for (i = 1; i < nel; i++)
229 min = FFMIN(array[i], min);
233 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
235 // Requirements (14496-3 sp04 p205)
237 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
240 if (bs_xover_band >= n_master) {
241 av_log(avctx, AV_LOG_ERROR,
242 "Invalid bitstream, crossover band index beyond array bounds: %d\n",
249 /// Master Frequency Band Table (14496-3 sp04 p194)
250 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
251 SpectrumParameters *spectrum)
253 unsigned int temp, max_qmf_subbands = 0;
254 unsigned int start_min, stop_min;
256 const int8_t *sbr_offset_ptr;
259 if (sbr->sample_rate < 32000) {
261 } else if (sbr->sample_rate < 64000) {
266 switch (sbr->sample_rate) {
268 sbr_offset_ptr = sbr_offset[0];
271 sbr_offset_ptr = sbr_offset[1];
274 sbr_offset_ptr = sbr_offset[2];
277 sbr_offset_ptr = sbr_offset[3];
279 case 44100: case 48000: case 64000:
280 sbr_offset_ptr = sbr_offset[4];
282 case 88200: case 96000: case 128000: case 176400: case 192000:
283 sbr_offset_ptr = sbr_offset[5];
286 av_log(ac->avctx, AV_LOG_ERROR,
287 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
291 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
292 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
294 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
296 if (spectrum->bs_stop_freq < 14) {
297 sbr->k[2] = stop_min;
298 make_bands(stop_dk, stop_min, 64, 13);
299 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
300 for (k = 0; k < spectrum->bs_stop_freq; k++)
301 sbr->k[2] += stop_dk[k];
302 } else if (spectrum->bs_stop_freq == 14) {
303 sbr->k[2] = 2*sbr->k[0];
304 } else if (spectrum->bs_stop_freq == 15) {
305 sbr->k[2] = 3*sbr->k[0];
307 av_log(ac->avctx, AV_LOG_ERROR,
308 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
311 sbr->k[2] = FFMIN(64, sbr->k[2]);
313 // Requirements (14496-3 sp04 p205)
314 if (sbr->sample_rate <= 32000) {
315 max_qmf_subbands = 48;
316 } else if (sbr->sample_rate == 44100) {
317 max_qmf_subbands = 35;
318 } else if (sbr->sample_rate >= 48000)
319 max_qmf_subbands = 32;
323 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
324 av_log(ac->avctx, AV_LOG_ERROR,
325 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
329 if (!spectrum->bs_freq_scale) {
332 dk = spectrum->bs_alter_scale + 1;
333 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
334 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
337 for (k = 1; k <= sbr->n_master; k++)
338 sbr->f_master[k] = dk;
340 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
343 sbr->f_master[2]-= (k2diff < -1);
345 sbr->f_master[sbr->n_master]++;
348 sbr->f_master[0] = sbr->k[0];
349 for (k = 1; k <= sbr->n_master; k++)
350 sbr->f_master[k] += sbr->f_master[k - 1];
353 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
354 int two_regions, num_bands_0;
355 int vdk0_max, vdk1_min;
359 #endif /* USE_FIXED */
361 if (49 * sbr->k[2] > 110 * sbr->k[0]) {
363 sbr->k[1] = 2 * sbr->k[0];
366 sbr->k[1] = sbr->k[2];
370 tmp = (sbr->k[1] << 23) / sbr->k[0];
371 while (tmp < 0x40000000) {
375 tmp = fixed_log(tmp - 0x80000000);
376 tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30);
377 tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands;
378 num_bands_0 = ((tmp + 0x400000) >> 23) * 2;
380 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
381 #endif /* USE_FIXED */
383 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
384 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
390 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
392 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
393 vdk0_max = vk0[num_bands_0];
396 for (k = 1; k <= num_bands_0; k++) {
397 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
398 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
409 tmp = (sbr->k[2] << 23) / sbr->k[1];
411 while (tmp < 0x40000000) {
415 tmp = fixed_log(tmp - 0x80000000);
416 tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30);
417 tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands;
418 if (spectrum->bs_alter_scale)
419 tmp = (int)(((int64_t)tmp * CONST_076923 + 0x40000000) >> 31);
420 num_bands_1 = ((tmp + 0x400000) >> 23) * 2;
422 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
423 : 1.0f; // bs_alter_scale = {0,1}
424 int num_bands_1 = lrintf(half_bands * invwarp *
425 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
426 #endif /* USE_FIXED */
427 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
429 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
431 if (vdk1_min < vdk0_max) {
433 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
434 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
436 vk1[num_bands_1] -= change;
439 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
442 for (k = 1; k <= num_bands_1; k++) {
443 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
444 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
450 sbr->n_master = num_bands_0 + num_bands_1;
451 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
453 memcpy(&sbr->f_master[0], vk0,
454 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
455 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
456 num_bands_1 * sizeof(sbr->f_master[0]));
459 sbr->n_master = num_bands_0;
460 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
462 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
469 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
470 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
472 int i, k, last_k = -1, last_msb = -1, sb = 0;
474 int usb = sbr->kx[1];
475 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
477 sbr->num_patches = 0;
479 if (goal_sb < sbr->kx[1] + sbr->m[1]) {
480 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
486 if (k == last_k && msb == last_msb) {
487 av_log(ac->avctx, AV_LOG_ERROR, "patch construction failed\n");
488 return AVERROR_INVALIDDATA;
492 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
493 sb = sbr->f_master[i];
494 odd = (sb + sbr->k[0]) & 1;
497 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
498 // After this check the final number of patches can still be six which is
499 // illegal however the Coding Technologies decoder check stream has a final
500 // count of 6 patches
501 if (sbr->num_patches > 5) {
502 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
506 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
507 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
509 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
516 if (sbr->f_master[k] - sb < 3)
518 } while (sb != sbr->kx[1] + sbr->m[1]);
520 if (sbr->num_patches > 1 &&
521 sbr->patch_num_subbands[sbr->num_patches - 1] < 3)
527 /// Derived Frequency Band Tables (14496-3 sp04 p197)
528 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
533 #endif /* USE_FIXED */
535 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
536 sbr->n[0] = (sbr->n[1] + 1) >> 1;
538 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
539 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
540 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
541 sbr->kx[1] = sbr->f_tablehigh[0];
543 // Requirements (14496-3 sp04 p205)
544 if (sbr->kx[1] + sbr->m[1] > 64) {
545 av_log(ac->avctx, AV_LOG_ERROR,
546 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
549 if (sbr->kx[1] > 32) {
550 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
554 sbr->f_tablelow[0] = sbr->f_tablehigh[0];
555 temp = sbr->n[1] & 1;
556 for (k = 1; k <= sbr->n[0]; k++)
557 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
559 temp = (sbr->k[2] << 23) / sbr->kx[1];
560 while (temp < 0x40000000) {
564 temp = fixed_log(temp - 0x80000000);
565 temp = (int)(((int64_t)temp * CONST_RECIP_LN2 + 0x20000000) >> 30);
566 temp = (((temp + 0x80) >> 8) + ((8 - nz) << 23)) * sbr->spectrum_params.bs_noise_bands;
568 sbr->n_q = (temp + 0x400000) >> 23;
572 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
573 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
574 #endif /* USE_FIXED */
577 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
581 sbr->f_tablenoise[0] = sbr->f_tablelow[0];
583 for (k = 1; k <= sbr->n_q; k++) {
584 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
585 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
588 if (sbr_hf_calc_npatches(ac, sbr) < 0)
591 sbr_make_f_tablelim(sbr);
593 sbr->data[0].f_indexnoise = 0;
594 sbr->data[1].f_indexnoise = 0;
599 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
603 for (i = 0; i < elements; i++) {
604 vec[i] = get_bits1(gb);
608 /** ceil(log2(index+1)) */
609 static const int8_t ceil_log2[] = {
613 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
614 GetBitContext *gb, SBRData *ch_data)
618 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
619 int abs_bord_trail = 16;
620 int num_rel_lead, num_rel_trail;
621 unsigned bs_num_env_old = ch_data->bs_num_env;
623 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
624 ch_data->bs_amp_res = sbr->bs_amp_res_header;
625 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
627 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
629 ch_data->bs_num_env = 1 << get_bits(gb, 2);
630 num_rel_lead = ch_data->bs_num_env - 1;
631 if (ch_data->bs_num_env == 1)
632 ch_data->bs_amp_res = 0;
634 if (ch_data->bs_num_env > 4) {
635 av_log(ac->avctx, AV_LOG_ERROR,
636 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
637 ch_data->bs_num_env);
641 ch_data->t_env[0] = 0;
642 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
644 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
646 for (i = 0; i < num_rel_lead; i++)
647 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
649 ch_data->bs_freq_res[1] = get_bits1(gb);
650 for (i = 1; i < ch_data->bs_num_env; i++)
651 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
654 abs_bord_trail += get_bits(gb, 2);
655 num_rel_trail = get_bits(gb, 2);
656 ch_data->bs_num_env = num_rel_trail + 1;
657 ch_data->t_env[0] = 0;
658 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
660 for (i = 0; i < num_rel_trail; i++)
661 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
662 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
664 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
666 for (i = 0; i < ch_data->bs_num_env; i++)
667 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
670 ch_data->t_env[0] = get_bits(gb, 2);
671 num_rel_lead = get_bits(gb, 2);
672 ch_data->bs_num_env = num_rel_lead + 1;
673 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
675 for (i = 0; i < num_rel_lead; i++)
676 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
678 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
680 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
683 ch_data->t_env[0] = get_bits(gb, 2);
684 abs_bord_trail += get_bits(gb, 2);
685 num_rel_lead = get_bits(gb, 2);
686 num_rel_trail = get_bits(gb, 2);
687 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
689 if (ch_data->bs_num_env > 5) {
690 av_log(ac->avctx, AV_LOG_ERROR,
691 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
692 ch_data->bs_num_env);
696 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
698 for (i = 0; i < num_rel_lead; i++)
699 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
700 for (i = 0; i < num_rel_trail; i++)
701 ch_data->t_env[ch_data->bs_num_env - 1 - i] =
702 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
704 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
706 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
710 av_assert0(bs_pointer >= 0);
711 if (bs_pointer > ch_data->bs_num_env + 1) {
712 av_log(ac->avctx, AV_LOG_ERROR,
713 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
718 for (i = 1; i <= ch_data->bs_num_env; i++) {
719 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
720 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
725 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
727 ch_data->t_q[0] = ch_data->t_env[0];
728 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
729 if (ch_data->bs_num_noise > 1) {
731 if (ch_data->bs_frame_class == FIXFIX) {
732 idx = ch_data->bs_num_env >> 1;
733 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
734 idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
738 else if (bs_pointer == 1)
739 idx = ch_data->bs_num_env - 1;
740 else // bs_pointer > 1
741 idx = bs_pointer - 1;
743 ch_data->t_q[1] = ch_data->t_env[idx];
746 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
747 ch_data->e_a[1] = -1;
748 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
749 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
750 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
751 ch_data->e_a[1] = bs_pointer - 1;
756 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
757 //These variables are saved from the previous frame rather than copied
758 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
759 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
760 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
762 //These variables are read from the bitstream and therefore copied
763 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
764 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
765 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
766 dst->bs_num_env = src->bs_num_env;
767 dst->bs_amp_res = src->bs_amp_res;
768 dst->bs_num_noise = src->bs_num_noise;
769 dst->bs_frame_class = src->bs_frame_class;
770 dst->e_a[1] = src->e_a[1];
773 /// Read how the envelope and noise floor data is delta coded
774 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
777 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
778 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
781 /// Read inverse filtering data
782 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
787 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
788 for (i = 0; i < sbr->n_q; i++)
789 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
792 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
793 SBRData *ch_data, int ch)
797 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
799 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
800 const int odd = sbr->n[1] & 1;
802 if (sbr->bs_coupling && ch) {
803 if (ch_data->bs_amp_res) {
805 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
806 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
807 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
808 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
811 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
812 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
813 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
814 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
817 if (ch_data->bs_amp_res) {
819 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
820 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
821 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
822 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
825 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
826 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
827 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
828 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
833 for (i = 0; i < ch_data->bs_num_env; i++) {
834 if (ch_data->bs_df_env[i]) {
835 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
836 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
837 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
838 ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i][j].mant + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
839 } else if (ch_data->bs_freq_res[i + 1]) {
840 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
841 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
842 ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i][k].mant + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
845 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
846 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
847 ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i][k].mant + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
851 ch_data->env_facs[i + 1][0].mant = delta * get_bits(gb, bits); // bs_env_start_value_balance
852 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
853 ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i + 1][j - 1].mant + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
857 for (i = 0; i < ch_data->bs_num_env; i++) {
858 if (ch_data->bs_df_env[i]) {
859 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
860 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
861 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
862 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
863 } else if (ch_data->bs_freq_res[i + 1]) {
864 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
865 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
866 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
869 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
870 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
871 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
875 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
876 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
877 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
880 #endif /* USE_FIXED */
882 //assign 0th elements of env_facs from last elements
883 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
884 sizeof(ch_data->env_facs[0]));
887 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
888 SBRData *ch_data, int ch)
891 VLC_TYPE (*t_huff)[2], (*f_huff)[2];
893 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
895 if (sbr->bs_coupling && ch) {
896 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
897 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
898 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
899 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
901 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
902 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
903 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
904 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
908 for (i = 0; i < ch_data->bs_num_noise; i++) {
909 if (ch_data->bs_df_noise[i]) {
910 for (j = 0; j < sbr->n_q; j++)
911 ch_data->noise_facs[i + 1][j].mant = ch_data->noise_facs[i][j].mant + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
913 ch_data->noise_facs[i + 1][0].mant = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
914 for (j = 1; j < sbr->n_q; j++)
915 ch_data->noise_facs[i + 1][j].mant = ch_data->noise_facs[i + 1][j - 1].mant + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
919 for (i = 0; i < ch_data->bs_num_noise; i++) {
920 if (ch_data->bs_df_noise[i]) {
921 for (j = 0; j < sbr->n_q; j++)
922 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
924 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
925 for (j = 1; j < sbr->n_q; j++)
926 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);
929 #endif /* USE_FIXED */
931 //assign 0th elements of noise_facs from last elements
932 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
933 sizeof(ch_data->noise_facs[0]));
936 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
938 int bs_extension_id, int *num_bits_left)
940 switch (bs_extension_id) {
941 case EXTENSION_ID_PS:
942 if (!ac->oc[1].m4ac.ps) {
943 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
944 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
948 *num_bits_left -= AAC_RENAME(ff_ps_read_data)(ac->avctx, gb, &sbr->ps, *num_bits_left);
949 ac->avctx->profile = FF_PROFILE_AAC_HE_V2;
951 avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");
952 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
958 // some files contain 0-padding
959 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
960 avpriv_request_sample(ac->avctx, "Reserved SBR extensions");
961 skip_bits_long(gb, *num_bits_left); // bs_fill_bits
967 static int read_sbr_single_channel_element(AACContext *ac,
968 SpectralBandReplication *sbr,
971 if (get_bits1(gb)) // bs_data_extra
972 skip_bits(gb, 4); // bs_reserved
974 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
976 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
977 read_sbr_invf(sbr, gb, &sbr->data[0]);
978 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
979 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
981 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
982 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
987 static int read_sbr_channel_pair_element(AACContext *ac,
988 SpectralBandReplication *sbr,
991 if (get_bits1(gb)) // bs_data_extra
992 skip_bits(gb, 8); // bs_reserved
994 if ((sbr->bs_coupling = get_bits1(gb))) {
995 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
997 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
998 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
999 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
1000 read_sbr_invf(sbr, gb, &sbr->data[0]);
1001 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
1002 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
1003 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
1004 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
1005 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
1006 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
1008 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
1009 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
1011 read_sbr_dtdf(sbr, gb, &sbr->data[0]);
1012 read_sbr_dtdf(sbr, gb, &sbr->data[1]);
1013 read_sbr_invf(sbr, gb, &sbr->data[0]);
1014 read_sbr_invf(sbr, gb, &sbr->data[1]);
1015 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
1016 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
1017 read_sbr_noise(sbr, gb, &sbr->data[0], 0);
1018 read_sbr_noise(sbr, gb, &sbr->data[1], 1);
1021 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
1022 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
1023 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
1024 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
1029 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
1030 GetBitContext *gb, int id_aac)
1032 unsigned int cnt = get_bits_count(gb);
1034 sbr->id_aac = id_aac;
1036 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
1037 if (read_sbr_single_channel_element(ac, sbr, gb)) {
1039 return get_bits_count(gb) - cnt;
1041 } else if (id_aac == TYPE_CPE) {
1042 if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1044 return get_bits_count(gb) - cnt;
1047 av_log(ac->avctx, AV_LOG_ERROR,
1048 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1050 return get_bits_count(gb) - cnt;
1052 if (get_bits1(gb)) { // bs_extended_data
1053 int num_bits_left = get_bits(gb, 4); // bs_extension_size
1054 if (num_bits_left == 15)
1055 num_bits_left += get_bits(gb, 8); // bs_esc_count
1057 num_bits_left <<= 3;
1058 while (num_bits_left > 7) {
1060 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1062 if (num_bits_left < 0) {
1063 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1065 if (num_bits_left > 0)
1066 skip_bits(gb, num_bits_left);
1069 return get_bits_count(gb) - cnt;
1072 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1075 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1077 err = sbr_make_f_derived(ac, sbr);
1079 av_log(ac->avctx, AV_LOG_ERROR,
1080 "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1086 * Decode Spectral Band Replication extension data; reference: table 4.55.
1088 * @param crc flag indicating the presence of CRC checksum
1089 * @param cnt length of TYPE_FIL syntactic element in bytes
1091 * @return Returns number of bytes consumed from the TYPE_FIL element.
1093 int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr,
1094 GetBitContext *gb_host, int crc, int cnt, int id_aac)
1096 unsigned int num_sbr_bits = 0, num_align_bits;
1097 unsigned bytes_read;
1098 GetBitContext gbc = *gb_host, *gb = &gbc;
1099 skip_bits_long(gb_host, cnt*8 - 4);
1103 if (!sbr->sample_rate)
1104 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1105 if (!ac->oc[1].m4ac.ext_sample_rate)
1106 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
1109 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1113 //Save some state from the previous frame.
1114 sbr->kx[0] = sbr->kx[1];
1115 sbr->m[0] = sbr->m[1];
1116 sbr->kx_and_m_pushed = 1;
1119 if (get_bits1(gb)) // bs_header_flag
1120 num_sbr_bits += read_sbr_header(sbr, gb);
1126 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1128 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1129 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1131 if (bytes_read > cnt) {
1132 av_log(ac->avctx, AV_LOG_ERROR,
1133 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1139 * Analysis QMF Bank (14496-3 sp04 p206)
1141 * @param x pointer to the beginning of the first sample window
1142 * @param W array of complex-valued samples split into subbands
1144 #ifndef sbr_qmf_analysis
1146 static void sbr_qmf_analysis(AVFixedDSPContext *dsp, FFTContext *mdct,
1148 static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,
1149 #endif /* USE_FIXED */
1150 SBRDSPContext *sbrdsp, const INTFLOAT *in, INTFLOAT *x,
1151 INTFLOAT z[320], INTFLOAT W[2][32][32][2], int buf_idx)
1154 memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1155 memcpy(x+288, in, 1024*sizeof(x[0]));
1156 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1157 // are not supported
1158 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1160 sbrdsp->qmf_pre_shuffle(z);
1161 mdct->imdct_half(mdct, z, z+64);
1162 sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
1169 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1170 * (14496-3 sp04 p206)
1172 #ifndef sbr_qmf_synthesis
1173 static void sbr_qmf_synthesis(FFTContext *mdct,
1175 SBRDSPContext *sbrdsp, AVFixedDSPContext *dsp,
1177 SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,
1178 #endif /* USE_FIXED */
1179 INTFLOAT *out, INTFLOAT X[2][38][64],
1180 INTFLOAT mdct_buf[2][64],
1181 INTFLOAT *v0, int *v_off, const unsigned int div)
1184 const INTFLOAT *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1185 const int step = 128 >> div;
1187 for (i = 0; i < 32; i++) {
1188 if (*v_off < step) {
1189 int saved_samples = (1280 - 128) >> div;
1190 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(INTFLOAT));
1191 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
1197 for (n = 0; n < 32; n++) {
1198 X[0][i][ n] = -X[0][i][n];
1199 X[0][i][32+n] = X[1][i][31-n];
1201 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1202 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
1204 sbrdsp->neg_odd_64(X[1][i]);
1205 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
1206 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
1207 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
1209 dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);
1210 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1211 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1212 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1213 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1214 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1215 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1216 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1217 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1218 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1224 /// Generate the subband filtered lowband
1225 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1226 INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],
1230 const int t_HFGen = 8;
1232 memset(X_low, 0, 32*sizeof(*X_low));
1233 for (k = 0; k < sbr->kx[1]; k++) {
1234 for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1235 X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
1236 X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
1239 buf_idx = 1-buf_idx;
1240 for (k = 0; k < sbr->kx[0]; k++) {
1241 for (i = 0; i < t_HFGen; i++) {
1242 X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
1243 X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
1249 /// High Frequency Generator (14496-3 sp04 p215)
1250 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1251 INTFLOAT X_high[64][40][2], const INTFLOAT X_low[32][40][2],
1252 const INTFLOAT (*alpha0)[2], const INTFLOAT (*alpha1)[2],
1253 const INTFLOAT bw_array[5], const uint8_t *t_env,
1259 for (j = 0; j < sbr->num_patches; j++) {
1260 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1261 const int p = sbr->patch_start_subband[j] + x;
1262 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1267 av_log(ac->avctx, AV_LOG_ERROR,
1268 "ERROR : no subband found for frequency %d\n", k);
1272 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
1273 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
1274 alpha0[p], alpha1[p], bw_array[g],
1275 2 * t_env[0], 2 * t_env[bs_num_env]);
1278 if (k < sbr->m[1] + sbr->kx[1])
1279 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1284 /// Generate the subband filtered lowband
1285 static int sbr_x_gen(SpectralBandReplication *sbr, INTFLOAT X[2][38][64],
1286 const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],
1287 const INTFLOAT X_low[32][40][2], int ch)
1291 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1292 memset(X, 0, 2*sizeof(*X));
1293 for (k = 0; k < sbr->kx[0]; k++) {
1294 for (i = 0; i < i_Temp; i++) {
1295 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1296 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1299 for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1300 for (i = 0; i < i_Temp; i++) {
1301 X[0][i][k] = Y0[i + i_f][k][0];
1302 X[1][i][k] = Y0[i + i_f][k][1];
1306 for (k = 0; k < sbr->kx[1]; k++) {
1307 for (i = i_Temp; i < 38; i++) {
1308 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1309 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1312 for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1313 for (i = i_Temp; i < i_f; i++) {
1314 X[0][i][k] = Y1[i][k][0];
1315 X[1][i][k] = Y1[i][k][1];
1321 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1322 * (14496-3 sp04 p217)
1324 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1325 SBRData *ch_data, int e_a[2])
1329 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1330 for (e = 0; e < ch_data->bs_num_env; e++) {
1331 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1332 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1335 if (sbr->kx[1] != table[0]) {
1336 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
1337 "Derived frequency tables were not regenerated.\n");
1341 for (i = 0; i < ilim; i++)
1342 for (m = table[i]; m < table[i + 1]; m++)
1343 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1345 // ch_data->bs_num_noise > 1 => 2 noise floors
1346 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1347 for (i = 0; i < sbr->n_q; i++)
1348 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1349 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1351 for (i = 0; i < sbr->n[1]; i++) {
1352 if (ch_data->bs_add_harmonic_flag) {
1353 const unsigned int m_midpoint =
1354 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1356 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1357 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1361 for (i = 0; i < ilim; i++) {
1362 int additional_sinusoid_present = 0;
1363 for (m = table[i]; m < table[i + 1]; m++) {
1364 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1365 additional_sinusoid_present = 1;
1369 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1370 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1374 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1378 /// Estimation of current envelope (14496-3 sp04 p218)
1379 static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2],
1380 SpectralBandReplication *sbr, SBRData *ch_data)
1383 int kx1 = sbr->kx[1];
1385 if (sbr->bs_interpol_freq) {
1386 for (e = 0; e < ch_data->bs_num_env; e++) {
1388 const SoftFloat recip_env_size = av_int2sf(0x20000000 / (ch_data->t_env[e + 1] - ch_data->t_env[e]), 30);
1390 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1391 #endif /* USE_FIXED */
1392 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1393 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1395 for (m = 0; m < sbr->m[1]; m++) {
1396 AAC_FLOAT sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
1398 e_curr[e][m] = av_mul_sf(sum, recip_env_size);
1400 e_curr[e][m] = sum * recip_env_size;
1401 #endif /* USE_FIXED */
1407 for (e = 0; e < ch_data->bs_num_env; e++) {
1408 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1409 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1410 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1411 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1413 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1415 SoftFloat sum = { 0, 0 };
1416 const SoftFloat den = av_int2sf(0x20000000 / (env_size * (table[p + 1] - table[p])), 29);
1417 for (k = table[p]; k < table[p + 1]; k++) {
1418 sum = av_add_sf(sum, sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb));
1420 sum = av_mul_sf(sum, den);
1423 const int den = env_size * (table[p + 1] - table[p]);
1425 for (k = table[p]; k < table[p + 1]; k++) {
1426 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
1429 #endif /* USE_FIXED */
1430 for (k = table[p]; k < table[p + 1]; k++) {
1431 e_curr[e][k - kx1] = sum;
1438 void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1439 INTFLOAT* L, INTFLOAT* R)
1441 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
1443 int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1446 if (id_aac != sbr->id_aac) {
1447 av_log(ac->avctx, AV_LOG_ERROR,
1448 "element type mismatch %d != %d\n", id_aac, sbr->id_aac);
1452 if (!sbr->kx_and_m_pushed) {
1453 sbr->kx[0] = sbr->kx[1];
1454 sbr->m[0] = sbr->m[1];
1456 sbr->kx_and_m_pushed = 0;
1460 sbr_dequant(sbr, id_aac);
1462 for (ch = 0; ch < nch; ch++) {
1463 /* decode channel */
1464 sbr_qmf_analysis(ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1465 (INTFLOAT*)sbr->qmf_filter_scratch,
1466 sbr->data[ch].W, sbr->data[ch].Ypos);
1467 sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low,
1468 (const INTFLOAT (*)[32][32][2]) sbr->data[ch].W,
1469 sbr->data[ch].Ypos);
1470 sbr->data[ch].Ypos ^= 1;
1472 sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,
1473 (const INTFLOAT (*)[40][2]) sbr->X_low, sbr->k[0]);
1474 sbr_chirp(sbr, &sbr->data[ch]);
1475 av_assert0(sbr->data[ch].bs_num_env > 0);
1476 sbr_hf_gen(ac, sbr, sbr->X_high,
1477 (const INTFLOAT (*)[40][2]) sbr->X_low,
1478 (const INTFLOAT (*)[2]) sbr->alpha0,
1479 (const INTFLOAT (*)[2]) sbr->alpha1,
1480 sbr->data[ch].bw_array, sbr->data[ch].t_env,
1481 sbr->data[ch].bs_num_env);
1484 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1486 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1487 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1488 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
1489 (const INTFLOAT (*)[40][2]) sbr->X_high,
1490 sbr, &sbr->data[ch],
1496 sbr->c.sbr_x_gen(sbr, sbr->X[ch],
1497 (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],
1498 (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos],
1499 (const INTFLOAT (*)[40][2]) sbr->X_low, ch);
1502 if (ac->oc[1].m4ac.ps == 1) {
1503 if (sbr->ps.start) {
1504 AAC_RENAME(ff_ps_apply)(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1506 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1511 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,
1512 L, sbr->X[0], sbr->qmf_filter_scratch,
1513 sbr->data[0].synthesis_filterbank_samples,
1514 &sbr->data[0].synthesis_filterbank_samples_offset,
1517 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,
1518 R, sbr->X[1], sbr->qmf_filter_scratch,
1519 sbr->data[1].synthesis_filterbank_samples,
1520 &sbr->data[1].synthesis_filterbank_samples_offset,
1524 static void aacsbr_func_ptr_init(AACSBRContext *c)
1526 c->sbr_lf_gen = sbr_lf_gen;
1527 c->sbr_hf_assemble = sbr_hf_assemble;
1528 c->sbr_x_gen = sbr_x_gen;
1529 c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;
1533 ff_aacsbr_func_ptr_init_mips(c);