FFmpeg: libavcodec/aacsbr.c Source File

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aacsbr.c

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1 /*

2 * AAC Spectral Band Replication decoding functions

5 *

6 * This file is part of FFmpeg.

7 *

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.

12 *

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.

17 *

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

21 */

23 /**

24 * @file

25 * AAC Spectral Band Replication decoding functions

26 * @author Robert Swain ( rob opendot cl )

27 */

29 #include "aac.h"

30 #include "sbr.h"

31 #include "aacsbr.h"

32 #include "aacsbrdata.h"

33 #include "aacsbr_tablegen.h"

34 #include "fft.h"

35 #include "aacps.h"

36 #include "sbrdsp.h"

37 #include "libavutil/internal.h"

38 #include "libavutil/libm.h"

39 #include "libavutil/avassert.h"

41 #include <stdint.h>

42 #include <float.h>

43 #include <math.h>

45 #define ENVELOPE_ADJUSTMENT_OFFSET 2

46 #define NOISE_FLOOR_OFFSET 6.0f

48 #if ARCH_MIPS

49 #include "mips/aacsbr_mips.h"

50 #endif /* ARCH_MIPS */

52 /**

53 * SBR VLC tables

54 */

55 enum {

56 T_HUFFMAN_ENV_1_5DB,

57 F_HUFFMAN_ENV_1_5DB,

58 T_HUFFMAN_ENV_BAL_1_5DB,

59 F_HUFFMAN_ENV_BAL_1_5DB,

60 T_HUFFMAN_ENV_3_0DB,

61 F_HUFFMAN_ENV_3_0DB,

62 T_HUFFMAN_ENV_BAL_3_0DB,

63 F_HUFFMAN_ENV_BAL_3_0DB,

64 T_HUFFMAN_NOISE_3_0DB,

65 T_HUFFMAN_NOISE_BAL_3_0DB,

66 };

68 /**

69 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)

70 */

71 enum {

72 FIXFIX,

73 FIXVAR,

74 VARFIX,

75 VARVAR,

76 };

78 enum {

79 EXTENSION_ID_PS = 2,

80 };

82 static VLC vlc_sbr[10];

83 static const int8_t vlc_sbr_lav[10] =

84 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };

86 #define SBR_INIT_VLC_STATIC(num, size) \

87 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \

88 sbr_tmp[num].sbr_bits , 1, 1, \

89 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \

90 size)

92 #define SBR_VLC_ROW(name) \

93 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }

95 static void aacsbr_func_ptr_init(AACSBRContext *c);

97 av_cold void ff_aac_sbr_init(void)

98 {

99 static const struct {

100 const void *sbr_codes, *sbr_bits;

101 const unsigned int table_size, elem_size;

102 } sbr_tmp[] = {

103 SBR_VLC_ROW(t_huffman_env_1_5dB),

104 SBR_VLC_ROW(f_huffman_env_1_5dB),

105 SBR_VLC_ROW(t_huffman_env_bal_1_5dB),

106 SBR_VLC_ROW(f_huffman_env_bal_1_5dB),

107 SBR_VLC_ROW(t_huffman_env_3_0dB),

108 SBR_VLC_ROW(f_huffman_env_3_0dB),

109 SBR_VLC_ROW(t_huffman_env_bal_3_0dB),

110 SBR_VLC_ROW(f_huffman_env_bal_3_0dB),

111 SBR_VLC_ROW(t_huffman_noise_3_0dB),

112 SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),

113 };

114

115 // SBR VLC table initialization

116 SBR_INIT_VLC_STATIC(0, 1098);

117 SBR_INIT_VLC_STATIC(1, 1092);

118 SBR_INIT_VLC_STATIC(2, 768);

119 SBR_INIT_VLC_STATIC(3, 1026);

120 SBR_INIT_VLC_STATIC(4, 1058);

121 SBR_INIT_VLC_STATIC(5, 1052);

122 SBR_INIT_VLC_STATIC(6, 544);

123 SBR_INIT_VLC_STATIC(7, 544);

124 SBR_INIT_VLC_STATIC(8, 592);

125 SBR_INIT_VLC_STATIC(9, 512);

126

127 aacsbr_tableinit();

128

129 ff_ps_init();

130 }

131

132 /** Places SBR in pure upsampling mode. */

133 static void sbr_turnoff(SpectralBandReplication *sbr) {

134 sbr->start = 0;

135 // Init defults used in pure upsampling mode

136 sbr->kx[1] = 32; //Typo in spec, kx' inits to 32

137 sbr->m[1] = 0;

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));

141 }

142

143 av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)

144 {

145 if(sbr->mdct.mdct_bits)

146 return;

147 sbr->kx[0] = sbr->kx[1];

148 sbr_turnoff(sbr);

149 sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);

150 sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);

151 /* SBR requires samples to be scaled to +/-32768.0 to work correctly.

152 * mdct scale factors are adjusted to scale up from +/-1.0 at analysis

153 * and scale back down at synthesis. */

154 ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));

155 ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);

156 ff_ps_ctx_init(&sbr->ps);

157 ff_sbrdsp_init(&sbr->dsp);

158 aacsbr_func_ptr_init(&sbr->c);

159 }

160

161 av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)

162 {

163 ff_mdct_end(&sbr->mdct);

164 ff_mdct_end(&sbr->mdct_ana);

165 }

166

167 static int qsort_comparison_function_int16(const void *a, const void *b)

168 {

169 return *(const int16_t *)a - *(const int16_t *)b;

170 }

171

172 static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)

173 {

174 int i;

175 for (i = 0; i <= last_el; i++)

176 if (table[i] == needle)

177 return 1;

178 return 0;

179 }

180

181 /// Limiter Frequency Band Table (14496-3 sp04 p198)

182 static void sbr_make_f_tablelim(SpectralBandReplication *sbr)

183 {

184 int k;

185 if (sbr->bs_limiter_bands > 0) {

186 static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)

187 1.18509277094158210129f, //2^(0.49/2)

188 1.11987160404675912501f }; //2^(0.49/3)

189 const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];

190 int16_t patch_borders[7];

191 uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;

192

193 patch_borders[0] = sbr->kx[1];

194 for (k = 1; k <= sbr->num_patches; k++)

195 patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];

196

197 memcpy(sbr->f_tablelim, sbr->f_tablelow,

198 (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));

199 if (sbr->num_patches > 1)

200 memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,

201 (sbr->num_patches - 1) * sizeof(patch_borders[0]));

202

203 qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],

204 sizeof(sbr->f_tablelim[0]),

205 qsort_comparison_function_int16);

206

207 sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;

208 while (out < sbr->f_tablelim + sbr->n_lim) {

209 if (*in >= *out * lim_bands_per_octave_warped) {

210 *++out = *in++;

211 } else if (*in == *out ||

212 !in_table_int16(patch_borders, sbr->num_patches, *in)) {

213 in++;

214 sbr->n_lim--;

215 } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {

216 *out = *in++;

217 sbr->n_lim--;

218 } else {

219 *++out = *in++;

220 }

221 }

222 } else {

223 sbr->f_tablelim[0] = sbr->f_tablelow[0];

224 sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];

225 sbr->n_lim = 1;

226 }

227 }

228

229 static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)

230 {

231 unsigned int cnt = get_bits_count(gb);

232 uint8_t bs_header_extra_1;

233 uint8_t bs_header_extra_2;

234 int old_bs_limiter_bands = sbr->bs_limiter_bands;

235 SpectrumParameters old_spectrum_params;

236

237 sbr->start = 1;

238

239 // Save last spectrum parameters variables to compare to new ones

240 memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));

241

242 sbr->bs_amp_res_header = get_bits1(gb);

243 sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);

244 sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);

245 sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);

246 skip_bits(gb, 2); // bs_reserved

247

248 bs_header_extra_1 = get_bits1(gb);

249 bs_header_extra_2 = get_bits1(gb);

250

251 if (bs_header_extra_1) {

252 sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);

253 sbr->spectrum_params.bs_alter_scale = get_bits1(gb);

254 sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);

255 } else {

256 sbr->spectrum_params.bs_freq_scale = 2;

257 sbr->spectrum_params.bs_alter_scale = 1;

258 sbr->spectrum_params.bs_noise_bands = 2;

259 }

260

261 // Check if spectrum parameters changed

262 if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))

263 sbr->reset = 1;

264

265 if (bs_header_extra_2) {

266 sbr->bs_limiter_bands = get_bits(gb, 2);

267 sbr->bs_limiter_gains = get_bits(gb, 2);

268 sbr->bs_interpol_freq = get_bits1(gb);

269 sbr->bs_smoothing_mode = get_bits1(gb);

270 } else {

271 sbr->bs_limiter_bands = 2;

272 sbr->bs_limiter_gains = 2;

273 sbr->bs_interpol_freq = 1;

274 sbr->bs_smoothing_mode = 1;

275 }

276

277 if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)

278 sbr_make_f_tablelim(sbr);

279

280 return get_bits_count(gb) - cnt;

281 }

282

283 static int array_min_int16(const int16_t *array, int nel)

284 {

285 int i, min = array[0];

286 for (i = 1; i < nel; i++)

287 min = FFMIN(array[i], min);

288 return min;

289 }

290

291 static void make_bands(int16_t* bands, int start, int stop, int num_bands)

292 {

293 int k, previous, present;

294 float base, prod;

295

296 base = powf((float)stop / start, 1.0f / num_bands);

297 prod = start;

298 previous = start;

299

300 for (k = 0; k < num_bands-1; k++) {

301 prod *= base;

302 present = lrintf(prod);

303 bands[k] = present - previous;

304 previous = present;

305 }

306 bands[num_bands-1] = stop - previous;

307 }

308

309 static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)

310 {

311 // Requirements (14496-3 sp04 p205)

312 if (n_master <= 0) {

313 av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);

314 return -1;

315 }

316 if (bs_xover_band >= n_master) {

317 av_log(avctx, AV_LOG_ERROR,

318 "Invalid bitstream, crossover band index beyond array bounds: %d\n",

319 bs_xover_band);

320 return -1;

321 }

322 return 0;

323 }

324

325 /// Master Frequency Band Table (14496-3 sp04 p194)

326 static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,

327 SpectrumParameters *spectrum)

328 {

329 unsigned int temp, max_qmf_subbands = 0;

330 unsigned int start_min, stop_min;

331 int k;

332 const int8_t *sbr_offset_ptr;

333 int16_t stop_dk[13];

334

335 if (sbr->sample_rate < 32000) {

336 temp = 3000;

337 } else if (sbr->sample_rate < 64000) {

338 temp = 4000;

339 } else

340 temp = 5000;

341

342 switch (sbr->sample_rate) {

343 case 16000:

344 sbr_offset_ptr = sbr_offset[0];

345 break;

346 case 22050:

347 sbr_offset_ptr = sbr_offset[1];

348 break;

349 case 24000:

350 sbr_offset_ptr = sbr_offset[2];

351 break;

352 case 32000:

353 sbr_offset_ptr = sbr_offset[3];

354 break;

355 case 44100: case 48000: case 64000:

356 sbr_offset_ptr = sbr_offset[4];

357 break;

358 case 88200: case 96000: case 128000: case 176400: case 192000:

359 sbr_offset_ptr = sbr_offset[5];

360 break;

361 default:

362 av_log(ac->avctx, AV_LOG_ERROR,

363 "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);

364 return -1;

365 }

366

367 start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;

368 stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;

369

370 sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];

371

372 if (spectrum->bs_stop_freq < 14) {

373 sbr->k[2] = stop_min;

374 make_bands(stop_dk, stop_min, 64, 13);

375 qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);

376 for (k = 0; k < spectrum->bs_stop_freq; k++)

377 sbr->k[2] += stop_dk[k];

378 } else if (spectrum->bs_stop_freq == 14) {

379 sbr->k[2] = 2*sbr->k[0];

380 } else if (spectrum->bs_stop_freq == 15) {

381 sbr->k[2] = 3*sbr->k[0];

382 } else {

383 av_log(ac->avctx, AV_LOG_ERROR,

384 "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);

385 return -1;

386 }

387 sbr->k[2] = FFMIN(64, sbr->k[2]);

388

389 // Requirements (14496-3 sp04 p205)

390 if (sbr->sample_rate <= 32000) {

391 max_qmf_subbands = 48;

392 } else if (sbr->sample_rate == 44100) {

393 max_qmf_subbands = 35;

394 } else if (sbr->sample_rate >= 48000)

395 max_qmf_subbands = 32;

396 else

397 av_assert0(0);

398

399 if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {

400 av_log(ac->avctx, AV_LOG_ERROR,

401 "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);

402 return -1;

403 }

404

405 if (!spectrum->bs_freq_scale) {

406 int dk, k2diff;

407

408 dk = spectrum->bs_alter_scale + 1;

409 sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;

410 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))

411 return -1;

412

413 for (k = 1; k <= sbr->n_master; k++)

414 sbr->f_master[k] = dk;

415

416 k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;

417 if (k2diff < 0) {

418 sbr->f_master[1]--;

419 sbr->f_master[2]-= (k2diff < -1);

420 } else if (k2diff) {

421 sbr->f_master[sbr->n_master]++;

422 }

423

424 sbr->f_master[0] = sbr->k[0];

425 for (k = 1; k <= sbr->n_master; k++)

426 sbr->f_master[k] += sbr->f_master[k - 1];

427

428 } else {

429 int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}

430 int two_regions, num_bands_0;

431 int vdk0_max, vdk1_min;

432 int16_t vk0[49];

433

434 if (49 * sbr->k[2] > 110 * sbr->k[0]) {

435 two_regions = 1;

436 sbr->k[1] = 2 * sbr->k[0];

437 } else {

438 two_regions = 0;

439 sbr->k[1] = sbr->k[2];

440 }

441

442 num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;

443

444 if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)

445 av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);

446 return -1;

447 }

448

449 vk0[0] = 0;

450

451 make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);

452

453 qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);

454 vdk0_max = vk0[num_bands_0];

455

456 vk0[0] = sbr->k[0];

457 for (k = 1; k <= num_bands_0; k++) {

458 if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)

459 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);

460 return -1;

461 }

462 vk0[k] += vk0[k-1];

463 }

464

465 if (two_regions) {

466 int16_t vk1[49];

467 float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f

468 : 1.0f; // bs_alter_scale = {0,1}

469 int num_bands_1 = lrintf(half_bands * invwarp *

470 log2f(sbr->k[2] / (float)sbr->k[1])) * 2;

471

472 make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);

473

474 vdk1_min = array_min_int16(vk1 + 1, num_bands_1);

475

476 if (vdk1_min < vdk0_max) {

477 int change;

478 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);

479 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);

480 vk1[1] += change;

481 vk1[num_bands_1] -= change;

482 }

483

484 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);

485

486 vk1[0] = sbr->k[1];

487 for (k = 1; k <= num_bands_1; k++) {

488 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)

489 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);

490 return -1;

491 }

492 vk1[k] += vk1[k-1];

493 }

494

495 sbr->n_master = num_bands_0 + num_bands_1;

496 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))

497 return -1;

498 memcpy(&sbr->f_master[0], vk0,

499 (num_bands_0 + 1) * sizeof(sbr->f_master[0]));

500 memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,

501 num_bands_1 * sizeof(sbr->f_master[0]));

502

503 } else {

504 sbr->n_master = num_bands_0;

505 if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))

506 return -1;

507 memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));

508 }

509 }

510

511 return 0;

512 }

513

514 /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)

515 static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)

516 {

517 int i, k, sb = 0;

518 int msb = sbr->k[0];

519 int usb = sbr->kx[1];

520 int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;

521

522 sbr->num_patches = 0;

523

524 if (goal_sb < sbr->kx[1] + sbr->m[1]) {

525 for (k = 0; sbr->f_master[k] < goal_sb; k++) ;

526 } else

527 k = sbr->n_master;

528

529 do {

530 int odd = 0;

531 for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {

532 sb = sbr->f_master[i];

533 odd = (sb + sbr->k[0]) & 1;

534 }

535

536 // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.

537 // After this check the final number of patches can still be six which is

538 // illegal however the Coding Technologies decoder check stream has a final

539 // count of 6 patches

540 if (sbr->num_patches > 5) {

541 av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);

542 return -1;

543 }

544

545 sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);

546 sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];

547

548 if (sbr->patch_num_subbands[sbr->num_patches] > 0) {

549 usb = sb;

550 msb = sb;

551 sbr->num_patches++;

552 } else

553 msb = sbr->kx[1];

554

555 if (sbr->f_master[k] - sb < 3)

556 k = sbr->n_master;

557 } while (sb != sbr->kx[1] + sbr->m[1]);

558

559 if (sbr->num_patches > 1 &&

560 sbr->patch_num_subbands[sbr->num_patches - 1] < 3)

561 sbr->num_patches--;

562

563 return 0;

564 }

565

566 /// Derived Frequency Band Tables (14496-3 sp04 p197)

567 static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)

568 {

569 int k, temp;

570

571 sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;

572 sbr->n[0] = (sbr->n[1] + 1) >> 1;

573

574 memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],

575 (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));

576 sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];

577 sbr->kx[1] = sbr->f_tablehigh[0];

578

579 // Requirements (14496-3 sp04 p205)

580 if (sbr->kx[1] + sbr->m[1] > 64) {

581 av_log(ac->avctx, AV_LOG_ERROR,

582 "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);

583 return -1;

584 }

585 if (sbr->kx[1] > 32) {

586 av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);

587 return -1;

588 }

589

590 sbr->f_tablelow[0] = sbr->f_tablehigh[0];

591 temp = sbr->n[1] & 1;

592 for (k = 1; k <= sbr->n[0]; k++)

593 sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];

594

595 sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *

596 log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3

597 if (sbr->n_q > 5) {

598 av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);

599 return -1;

600 }

601

602 sbr->f_tablenoise[0] = sbr->f_tablelow[0];

603 temp = 0;

604 for (k = 1; k <= sbr->n_q; k++) {

605 temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);

606 sbr->f_tablenoise[k] = sbr->f_tablelow[temp];

607 }

608

609 if (sbr_hf_calc_npatches(ac, sbr) < 0)

610 return -1;

611

612 sbr_make_f_tablelim(sbr);

613

614 sbr->data[0].f_indexnoise = 0;

615 sbr->data[1].f_indexnoise = 0;

616

617 return 0;

618 }

619

620 static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,

621 int elements)

622 {

623 int i;

624 for (i = 0; i < elements; i++) {

625 vec[i] = get_bits1(gb);

626 }

627 }

628

629 /** ceil(log2(index+1)) */

630 static const int8_t ceil_log2[] = {

631 0, 1, 2, 2, 3, 3,

632 };

633

634 static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,

635 GetBitContext *gb, SBRData *ch_data)

636 {

637 int i;

638 unsigned bs_pointer = 0;

639 // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots

640 int abs_bord_trail = 16;

641 int num_rel_lead, num_rel_trail;

642 unsigned bs_num_env_old = ch_data->bs_num_env;

643

644 ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];

645 ch_data->bs_amp_res = sbr->bs_amp_res_header;

646 ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];

647

648 switch (ch_data->bs_frame_class = get_bits(gb, 2)) {

649 case FIXFIX:

650 ch_data->bs_num_env = 1 << get_bits(gb, 2);

651 num_rel_lead = ch_data->bs_num_env - 1;

652 if (ch_data->bs_num_env == 1)

653 ch_data->bs_amp_res = 0;

654

655 if (ch_data->bs_num_env > 4) {

656 av_log(ac->avctx, AV_LOG_ERROR,

657 "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",

658 ch_data->bs_num_env);

659 return -1;

660 }

661

662 ch_data->t_env[0] = 0;

663 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

664

665 abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /

666 ch_data->bs_num_env;

667 for (i = 0; i < num_rel_lead; i++)

668 ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;

669

670 ch_data->bs_freq_res[1] = get_bits1(gb);

671 for (i = 1; i < ch_data->bs_num_env; i++)

672 ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];

673 break;

674 case FIXVAR:

675 abs_bord_trail += get_bits(gb, 2);

676 num_rel_trail = get_bits(gb, 2);

677 ch_data->bs_num_env = num_rel_trail + 1;

678 ch_data->t_env[0] = 0;

679 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

680

681 for (i = 0; i < num_rel_trail; i++)

682 ch_data->t_env[ch_data->bs_num_env - 1 - i] =

683 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;

684

685 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);

686

687 for (i = 0; i < ch_data->bs_num_env; i++)

688 ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);

689 break;

690 case VARFIX:

691 ch_data->t_env[0] = get_bits(gb, 2);

692 num_rel_lead = get_bits(gb, 2);

693 ch_data->bs_num_env = num_rel_lead + 1;

694 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

695

696 for (i = 0; i < num_rel_lead; i++)

697 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;

698

699 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);

700

701 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);

702 break;

703 case VARVAR:

704 ch_data->t_env[0] = get_bits(gb, 2);

705 abs_bord_trail += get_bits(gb, 2);

706 num_rel_lead = get_bits(gb, 2);

707 num_rel_trail = get_bits(gb, 2);

708 ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;

709

710 if (ch_data->bs_num_env > 5) {

711 av_log(ac->avctx, AV_LOG_ERROR,

712 "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",

713 ch_data->bs_num_env);

714 return -1;

715 }

716

717 ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

718

719 for (i = 0; i < num_rel_lead; i++)

720 ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;

721 for (i = 0; i < num_rel_trail; i++)

722 ch_data->t_env[ch_data->bs_num_env - 1 - i] =

723 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;

724

725 bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);

726

727 get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);

728 break;

729 }

730

731 if (bs_pointer > ch_data->bs_num_env + 1) {

732 av_log(ac->avctx, AV_LOG_ERROR,

733 "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",

734 bs_pointer);

735 return -1;

736 }

737

738 for (i = 1; i <= ch_data->bs_num_env; i++) {

739 if (ch_data->t_env[i-1] > ch_data->t_env[i]) {

740 av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");

741 return -1;

742 }

743 }

744

745 ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;

746

747 ch_data->t_q[0] = ch_data->t_env[0];

748 ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];

749 if (ch_data->bs_num_noise > 1) {

750 unsigned int idx;

751 if (ch_data->bs_frame_class == FIXFIX) {

752 idx = ch_data->bs_num_env >> 1;

753 } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR

754 idx = ch_data->bs_num_env - FFMAX((int)bs_pointer - 1, 1);

755 } else { // VARFIX

756 if (!bs_pointer)

757 idx = 1;

758 else if (bs_pointer == 1)

759 idx = ch_data->bs_num_env - 1;

760 else // bs_pointer > 1

761 idx = bs_pointer - 1;

762 }

763 ch_data->t_q[1] = ch_data->t_env[idx];

764 }

765

766 ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev

767 ch_data->e_a[1] = -1;

768 if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0

769 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;

770 } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1

771 ch_data->e_a[1] = bs_pointer - 1;

772

773 return 0;

774 }

775

776 static void copy_sbr_grid(SBRData *dst, const SBRData *src) {

777 //These variables are saved from the previous frame rather than copied

778 dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];

779 dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];

780 dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);

781

782 //These variables are read from the bitstream and therefore copied

783 memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));

784 memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));

785 memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));

786 dst->bs_num_env = src->bs_num_env;

787 dst->bs_amp_res = src->bs_amp_res;

788 dst->bs_num_noise = src->bs_num_noise;

789 dst->bs_frame_class = src->bs_frame_class;

790 dst->e_a[1] = src->e_a[1];

791 }

792

793 /// Read how the envelope and noise floor data is delta coded

794 static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,

795 SBRData *ch_data)

796 {

797 get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);

798 get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);

799 }

800

801 /// Read inverse filtering data

802 static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,

803 SBRData *ch_data)

804 {

805 int i;

806

807 memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));

808 for (i = 0; i < sbr->n_q; i++)

809 ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);

810 }

811

812 static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,

813 SBRData *ch_data, int ch)

814 {

815 int bits;

816 int i, j, k;

817 VLC_TYPE (*t_huff)[2], (*f_huff)[2];

818 int t_lav, f_lav;

819 const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;

820 const int odd = sbr->n[1] & 1;

821

822 if (sbr->bs_coupling && ch) {

823 if (ch_data->bs_amp_res) {

824 bits = 5;

825 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;

826 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];

827 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

828 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

829 } else {

830 bits = 6;

831 t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;

832 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];

833 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;

834 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];

835 }

836 } else {

837 if (ch_data->bs_amp_res) {

838 bits = 6;

839 t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;

840 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];

841 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

842 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

843 } else {

844 bits = 7;

845 t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;

846 t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];

847 f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;

848 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];

849 }

850 }

851

852 for (i = 0; i < ch_data->bs_num_env; i++) {

853 if (ch_data->bs_df_env[i]) {

854 // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame

855 if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {

856 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)

857 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

858 } else if (ch_data->bs_freq_res[i + 1]) {

859 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {

860 k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]

861 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

862 }

863 } else {

864 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {

865 k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]

866 ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

867 }

868 }

869 } else {

870 ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance

871 for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)

872 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);

873 }

874 }

875

876 //assign 0th elements of env_facs from last elements

877 memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],

878 sizeof(ch_data->env_facs[0]));

879 }

880

881 static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,

882 SBRData *ch_data, int ch)

883 {

884 int i, j;

885 VLC_TYPE (*t_huff)[2], (*f_huff)[2];

886 int t_lav, f_lav;

887 int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;

888

889 if (sbr->bs_coupling && ch) {

890 t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;

891 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];

892 f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

893 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

894 } else {

895 t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;

896 t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];

897 f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

898 f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

899 }

900

901 for (i = 0; i < ch_data->bs_num_noise; i++) {

902 if (ch_data->bs_df_noise[i]) {

903 for (j = 0; j < sbr->n_q; j++)

904 ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);

905 } else {

906 ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level

907 for (j = 1; j < sbr->n_q; j++)

908 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);

909 }

910 }

911

912 //assign 0th elements of noise_facs from last elements

913 memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],

914 sizeof(ch_data->noise_facs[0]));

915 }

916

917 static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,

918 GetBitContext *gb,

919 int bs_extension_id, int *num_bits_left)

920 {

921 switch (bs_extension_id) {

922 case EXTENSION_ID_PS:

923 if (!ac->oc[1].m4ac.ps) {

924 av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");

925 skip_bits_long(gb, *num_bits_left); // bs_fill_bits

926 *num_bits_left = 0;

927 } else {

928 #if 1

929 *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);

930 ac->avctx->profile = FF_PROFILE_AAC_HE_V2;

931 #else

932 avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");

933 skip_bits_long(gb, *num_bits_left); // bs_fill_bits

934 *num_bits_left = 0;

935 #endif

936 }

937 break;

938 default:

939 // some files contain 0-padding

940 if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))

941 avpriv_request_sample(ac->avctx, "Reserved SBR extensions");

942 skip_bits_long(gb, *num_bits_left); // bs_fill_bits

943 *num_bits_left = 0;

944 break;

945 }

946 }

947

948 static int read_sbr_single_channel_element(AACContext *ac,

949 SpectralBandReplication *sbr,

950 GetBitContext *gb)

951 {

952 if (get_bits1(gb)) // bs_data_extra

953 skip_bits(gb, 4); // bs_reserved

954

955 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))

956 return -1;

957 read_sbr_dtdf(sbr, gb, &sbr->data[0]);

958 read_sbr_invf(sbr, gb, &sbr->data[0]);

959 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

960 read_sbr_noise(sbr, gb, &sbr->data[0], 0);

961

962 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))

963 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);

964

965 return 0;

966 }

967

968 static int read_sbr_channel_pair_element(AACContext *ac,

969 SpectralBandReplication *sbr,

970 GetBitContext *gb)

971 {

972 if (get_bits1(gb)) // bs_data_extra

973 skip_bits(gb, 8); // bs_reserved

974

975 if ((sbr->bs_coupling = get_bits1(gb))) {

976 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))

977 return -1;

978 copy_sbr_grid(&sbr->data[1], &sbr->data[0]);

979 read_sbr_dtdf(sbr, gb, &sbr->data[0]);

980 read_sbr_dtdf(sbr, gb, &sbr->data[1]);

981 read_sbr_invf(sbr, gb, &sbr->data[0]);

982 memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));

983 memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));

984 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

985 read_sbr_noise(sbr, gb, &sbr->data[0], 0);

986 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);

987 read_sbr_noise(sbr, gb, &sbr->data[1], 1);

988 } else {

989 if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||

990 read_sbr_grid(ac, sbr, gb, &sbr->data[1]))

991 return -1;

992 read_sbr_dtdf(sbr, gb, &sbr->data[0]);

993 read_sbr_dtdf(sbr, gb, &sbr->data[1]);

994 read_sbr_invf(sbr, gb, &sbr->data[0]);

995 read_sbr_invf(sbr, gb, &sbr->data[1]);

996 read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

997 read_sbr_envelope(sbr, gb, &sbr->data[1], 1);

998 read_sbr_noise(sbr, gb, &sbr->data[0], 0);

999 read_sbr_noise(sbr, gb, &sbr->data[1], 1);

1000 }

1001

1002 if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))

1003 get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);

1004 if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))

1005 get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);

1006

1007 return 0;

1008 }

1009

1010 static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,

1011 GetBitContext *gb, int id_aac)

1012 {

1013 unsigned int cnt = get_bits_count(gb);

1014

1015 if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {

1016 if (read_sbr_single_channel_element(ac, sbr, gb)) {

1017 sbr_turnoff(sbr);

1018 return get_bits_count(gb) - cnt;

1019 }

1020 } else if (id_aac == TYPE_CPE) {

1021 if (read_sbr_channel_pair_element(ac, sbr, gb)) {

1022 sbr_turnoff(sbr);

1023 return get_bits_count(gb) - cnt;

1024 }

1025 } else {

1026 av_log(ac->avctx, AV_LOG_ERROR,

1027 "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);

1028 sbr_turnoff(sbr);

1029 return get_bits_count(gb) - cnt;

1030 }

1031 if (get_bits1(gb)) { // bs_extended_data

1032 int num_bits_left = get_bits(gb, 4); // bs_extension_size

1033 if (num_bits_left == 15)

1034 num_bits_left += get_bits(gb, 8); // bs_esc_count

1035

1036 num_bits_left <<= 3;

1037 while (num_bits_left > 7) {

1038 num_bits_left -= 2;

1039 read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id

1040 }

1041 if (num_bits_left < 0) {

1042 av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");

1043 }

1044 if (num_bits_left > 0)

1045 skip_bits(gb, num_bits_left);

1046 }

1047

1048 return get_bits_count(gb) - cnt;

1049 }

1050

1051 static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)

1052 {

1053 int err;

1054 err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);

1055 if (err >= 0)

1056 err = sbr_make_f_derived(ac, sbr);

1057 if (err < 0) {

1058 av_log(ac->avctx, AV_LOG_ERROR,

1059 "SBR reset failed. Switching SBR to pure upsampling mode.\n");

1060 sbr_turnoff(sbr);

1061 }

1062 }

1063

1064 /**

1065 * Decode Spectral Band Replication extension data; reference: table 4.55.

1066 *

1067 * @param crc flag indicating the presence of CRC checksum

1068 * @param cnt length of TYPE_FIL syntactic element in bytes

1069 *

1070 * @return Returns number of bytes consumed from the TYPE_FIL element.

1071 */

1072 int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,

1073 GetBitContext *gb_host, int crc, int cnt, int id_aac)

1074 {

1075 unsigned int num_sbr_bits = 0, num_align_bits;

1076 unsigned bytes_read;

1077 GetBitContext gbc = *gb_host, *gb = &gbc;

1078 skip_bits_long(gb_host, cnt*8 - 4);

1079

1080 sbr->reset = 0;

1081

1082 if (!sbr->sample_rate)

1083 sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support

1084 if (!ac->oc[1].m4ac.ext_sample_rate)

1085 ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;

1086

1087 if (crc) {

1088 skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check

1089 num_sbr_bits += 10;

1090 }

1091

1092 //Save some state from the previous frame.

1093 sbr->kx[0] = sbr->kx[1];

1094 sbr->m[0] = sbr->m[1];

1095 sbr->kx_and_m_pushed = 1;

1096

1097 num_sbr_bits++;

1098 if (get_bits1(gb)) // bs_header_flag

1099 num_sbr_bits += read_sbr_header(sbr, gb);

1100

1101 if (sbr->reset)

1102 sbr_reset(ac, sbr);

1103

1104 if (sbr->start)

1105 num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);

1106

1107 num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;

1108 bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);

1109

1110 if (bytes_read > cnt) {

1111 av_log(ac->avctx, AV_LOG_ERROR,

1112 "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);

1113 }

1114 return cnt;

1115 }

1116

1117 /// Dequantization and stereo decoding (14496-3 sp04 p203)

1118 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)

1119 {

1120 int k, e;

1121 int ch;

1122

1123 if (id_aac == TYPE_CPE && sbr->bs_coupling) {

1124 float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;

1125 float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;

1126 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {

1127 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {

1128 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);

1129 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);

1130 float fac;

1131 if (temp1 > 1E20) {

1132 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");

1133 temp1 = 1;

1134 }

1135 fac = temp1 / (1.0f + temp2);

1136 sbr->data[0].env_facs[e][k] = fac;

1137 sbr->data[1].env_facs[e][k] = fac * temp2;

1138 }

1139 }

1140 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {

1141 for (k = 0; k < sbr->n_q; k++) {

1142 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);

1143 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);

1144 float fac;

1145 if (temp1 > 1E20) {

1146 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");

1147 temp1 = 1;

1148 }

1149 fac = temp1 / (1.0f + temp2);

1150 sbr->data[0].noise_facs[e][k] = fac;

1151 sbr->data[1].noise_facs[e][k] = fac * temp2;

1152 }

1153 }

1154 } else { // SCE or one non-coupled CPE

1155 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {

1156 float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;

1157 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)

1158 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){

1159 sbr->data[ch].env_facs[e][k] =

1160 exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);

1161 if (sbr->data[ch].env_facs[e][k] > 1E20) {

1162 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");

1163 sbr->data[ch].env_facs[e][k] = 1;

1164 }

1165 }

1166

1167 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)

1168 for (k = 0; k < sbr->n_q; k++)

1169 sbr->data[ch].noise_facs[e][k] =

1170 exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);

1171 }

1172 }

1173 }

1174

1175 /**

1176 * Analysis QMF Bank (14496-3 sp04 p206)

1177 *

1178 * @param x pointer to the beginning of the first sample window

1179 * @param W array of complex-valued samples split into subbands

1180 */

1181 #ifndef sbr_qmf_analysis

1182 static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,

1183 SBRDSPContext *sbrdsp, const float *in, float *x,

1184 float z[320], float W[2][32][32][2], int buf_idx)

1185 {

1186 int i;

1187 memcpy(x , x+1024, (320-32)*sizeof(x[0]));

1188 memcpy(x+288, in, 1024*sizeof(x[0]));

1189 for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames

1190 // are not supported

1191 dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);

1192 sbrdsp->sum64x5(z);

1193 sbrdsp->qmf_pre_shuffle(z);

1194 mdct->imdct_half(mdct, z, z+64);

1195 sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);

1196 x += 32;

1197 }

1198 }

1199 #endif

1200

1201 /**

1202 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank

1203 * (14496-3 sp04 p206)

1204 */

1205 #ifndef sbr_qmf_synthesis

1206 static void sbr_qmf_synthesis(FFTContext *mdct,

1207 SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,

1208 float *out, float X[2][38][64],

1209 float mdct_buf[2][64],

1210 float *v0, int *v_off, const unsigned int div)

1211 {

1212 int i, n;

1213 const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;

1214 const int step = 128 >> div;

1215 float *v;

1216 for (i = 0; i < 32; i++) {

1217 if (*v_off < step) {

1218 int saved_samples = (1280 - 128) >> div;

1219 memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));

1220 *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;

1221 } else {

1222 *v_off -= step;

1223 }

1224 v = v0 + *v_off;

1225 if (div) {

1226 for (n = 0; n < 32; n++) {

1227 X[0][i][ n] = -X[0][i][n];

1228 X[0][i][32+n] = X[1][i][31-n];

1229 }

1230 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

1231 sbrdsp->qmf_deint_neg(v, mdct_buf[0]);

1232 } else {

1233 sbrdsp->neg_odd_64(X[1][i]);

1234 mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

1235 mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);

1236 sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);

1237 }

1238 dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);

1239 dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);

1240 dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);

1241 dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);

1242 dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);

1243 dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);

1244 dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);

1245 dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);

1246 dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);

1247 dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);

1248 out += 64 >> div;

1249 }

1250 }

1251 #endif

1252

1253 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering

1254 * (14496-3 sp04 p214)

1255 * Warning: This routine does not seem numerically stable.

1256 */

1257 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,

1258 float (*alpha0)[2], float (*alpha1)[2],

1259 const float X_low[32][40][2], int k0)

1260 {

1261 int k;

1262 for (k = 0; k < k0; k++) {

1263 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);

1264 float dk;

1265

1266 dsp->autocorrelate(X_low[k], phi);

1267

1268 dk = phi[2][1][0] * phi[1][0][0] -

1269 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;

1270

1271 if (!dk) {

1272 alpha1[k][0] = 0;

1273 alpha1[k][1] = 0;

1274 } else {

1275 float temp_real, temp_im;

1276 temp_real = phi[0][0][0] * phi[1][1][0] -

1277 phi[0][0][1] * phi[1][1][1] -

1278 phi[0][1][0] * phi[1][0][0];

1279 temp_im = phi[0][0][0] * phi[1][1][1] +

1280 phi[0][0][1] * phi[1][1][0] -

1281 phi[0][1][1] * phi[1][0][0];

1282

1283 alpha1[k][0] = temp_real / dk;

1284 alpha1[k][1] = temp_im / dk;

1285 }

1286

1287 if (!phi[1][0][0]) {

1288 alpha0[k][0] = 0;

1289 alpha0[k][1] = 0;

1290 } else {

1291 float temp_real, temp_im;

1292 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +

1293 alpha1[k][1] * phi[1][1][1];

1294 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -

1295 alpha1[k][0] * phi[1][1][1];

1296

1297 alpha0[k][0] = -temp_real / phi[1][0][0];

1298 alpha0[k][1] = -temp_im / phi[1][0][0];

1299 }

1300

1301 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||

1302 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {

1303 alpha1[k][0] = 0;

1304 alpha1[k][1] = 0;

1305 alpha0[k][0] = 0;

1306 alpha0[k][1] = 0;

1307 }

1308 }

1309 }

1310

1311 /// Chirp Factors (14496-3 sp04 p214)

1312 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)

1313 {

1314 int i;

1315 float new_bw;

1316 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };

1317

1318 for (i = 0; i < sbr->n_q; i++) {

1319 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {

1320 new_bw = 0.6f;

1321 } else

1322 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];

1323

1324 if (new_bw < ch_data->bw_array[i]) {

1325 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];

1326 } else

1327 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];

1328 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;

1329 }

1330 }

1331

1332 /// Generate the subband filtered lowband

1333 static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,

1334 float X_low[32][40][2], const float W[2][32][32][2],

1335 int buf_idx)

1336 {

1337 int i, k;

1338 const int t_HFGen = 8;

1339 const int i_f = 32;

1340 memset(X_low, 0, 32*sizeof(*X_low));

1341 for (k = 0; k < sbr->kx[1]; k++) {

1342 for (i = t_HFGen; i < i_f + t_HFGen; i++) {

1343 X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];

1344 X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];

1345 }

1346 }

1347 buf_idx = 1-buf_idx;

1348 for (k = 0; k < sbr->kx[0]; k++) {

1349 for (i = 0; i < t_HFGen; i++) {

1350 X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];

1351 X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];

1352 }

1353 }

1354 return 0;

1355 }

1356

1357 /// High Frequency Generator (14496-3 sp04 p215)

1358 static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,

1359 float X_high[64][40][2], const float X_low[32][40][2],

1360 const float (*alpha0)[2], const float (*alpha1)[2],

1361 const float bw_array[5], const uint8_t *t_env,

1362 int bs_num_env)

1363 {

1364 int j, x;

1365 int g = 0;

1366 int k = sbr->kx[1];

1367 for (j = 0; j < sbr->num_patches; j++) {

1368 for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {

1369 const int p = sbr->patch_start_subband[j] + x;

1370 while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])

1371 g++;

1372 g--;

1373

1374 if (g < 0) {

1375 av_log(ac->avctx, AV_LOG_ERROR,

1376 "ERROR : no subband found for frequency %d\n", k);

1377 return -1;

1378 }

1379

1380 sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,

1381 X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,

1382 alpha0[p], alpha1[p], bw_array[g],

1383 2 * t_env[0], 2 * t_env[bs_num_env]);

1384 }

1385 }

1386 if (k < sbr->m[1] + sbr->kx[1])

1387 memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));

1388

1389 return 0;

1390 }

1391

1392 /// Generate the subband filtered lowband

1393 static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],

1394 const float Y0[38][64][2], const float Y1[38][64][2],

1395 const float X_low[32][40][2], int ch)

1396 {

1397 int k, i;

1398 const int i_f = 32;

1399 const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);

1400 memset(X, 0, 2*sizeof(*X));

1401 for (k = 0; k < sbr->kx[0]; k++) {

1402 for (i = 0; i < i_Temp; i++) {

1403 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

1404 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

1405 }

1406 }

1407 for (; k < sbr->kx[0] + sbr->m[0]; k++) {

1408 for (i = 0; i < i_Temp; i++) {

1409 X[0][i][k] = Y0[i + i_f][k][0];

1410 X[1][i][k] = Y0[i + i_f][k][1];

1411 }

1412 }

1413

1414 for (k = 0; k < sbr->kx[1]; k++) {

1415 for (i = i_Temp; i < 38; i++) {

1416 X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

1417 X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

1418 }

1419 }

1420 for (; k < sbr->kx[1] + sbr->m[1]; k++) {

1421 for (i = i_Temp; i < i_f; i++) {

1422 X[0][i][k] = Y1[i][k][0];

1423 X[1][i][k] = Y1[i][k][1];

1424 }

1425 }

1426 return 0;

1427 }

1428

1429 /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping

1430 * (14496-3 sp04 p217)

1431 */

1432 static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,

1433 SBRData *ch_data, int e_a[2])

1434 {

1435 int e, i, m;

1436

1437 memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));

1438 for (e = 0; e < ch_data->bs_num_env; e++) {

1439 const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];

1440 uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

1441 int k;

1442

1443 if (sbr->kx[1] != table[0]) {

1444 av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "

1445 "Derived frequency tables were not regenerated.\n");

1446 sbr_turnoff(sbr);

1447 return AVERROR_BUG;

1448 }

1449 for (i = 0; i < ilim; i++)

1450 for (m = table[i]; m < table[i + 1]; m++)

1451 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];

1452

1453 // ch_data->bs_num_noise > 1 => 2 noise floors

1454 k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);

1455 for (i = 0; i < sbr->n_q; i++)

1456 for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)

1457 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];

1458

1459 for (i = 0; i < sbr->n[1]; i++) {

1460 if (ch_data->bs_add_harmonic_flag) {

1461 const unsigned int m_midpoint =

1462 (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;

1463

1464 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *

1465 (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));

1466 }

1467 }

1468

1469 for (i = 0; i < ilim; i++) {

1470 int additional_sinusoid_present = 0;

1471 for (m = table[i]; m < table[i + 1]; m++) {

1472 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {

1473 additional_sinusoid_present = 1;

1474 break;

1475 }

1476 }

1477 memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,

1478 (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));

1479 }

1480 }

1481

1482 memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));

1483 return 0;

1484 }

1485

1486 /// Estimation of current envelope (14496-3 sp04 p218)

1487 static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],

1488 SpectralBandReplication *sbr, SBRData *ch_data)

1489 {

1490 int e, m;

1491 int kx1 = sbr->kx[1];

1492

1493 if (sbr->bs_interpol_freq) {

1494 for (e = 0; e < ch_data->bs_num_env; e++) {

1495 const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);

1496 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

1497 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

1498

1499 for (m = 0; m < sbr->m[1]; m++) {

1500 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);

1501 e_curr[e][m] = sum * recip_env_size;

1502 }

1503 }

1504 } else {

1505 int k, p;

1506

1507 for (e = 0; e < ch_data->bs_num_env; e++) {

1508 const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);

1509 int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

1510 int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

1511 const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

1512

1513 for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {

1514 float sum = 0.0f;

1515 const int den = env_size * (table[p + 1] - table[p]);

1516

1517 for (k = table[p]; k < table[p + 1]; k++) {

1518 sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);

1519 }

1520 sum /= den;

1521 for (k = table[p]; k < table[p + 1]; k++) {

1522 e_curr[e][k - kx1] = sum;

1523 }

1524 }

1525 }

1526 }

1527 }

1528

1529 /**

1530 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)

1531 * and Calculation of gain (14496-3 sp04 p219)

1532 */

1533 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,

1534 SBRData *ch_data, const int e_a[2])

1535 {

1536 int e, k, m;

1537 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)

1538 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };

1539

1540 for (e = 0; e < ch_data->bs_num_env; e++) {

1541 int delta = !((e == e_a[1]) || (e == e_a[0]));

1542 for (k = 0; k < sbr->n_lim; k++) {

1543 float gain_boost, gain_max;

1544 float sum[2] = { 0.0f, 0.0f };

1545 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

1546 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);

1547 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);

1548 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);

1549 if (!sbr->s_mapped[e][m]) {

1550 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /

1551 ((1.0f + sbr->e_curr[e][m]) *

1552 (1.0f + sbr->q_mapped[e][m] * delta)));

1553 } else {

1554 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /

1555 ((1.0f + sbr->e_curr[e][m]) *

1556 (1.0f + sbr->q_mapped[e][m])));

1557 }

1558 }

1559 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

1560 sum[0] += sbr->e_origmapped[e][m];

1561 sum[1] += sbr->e_curr[e][m];

1562 }

1563 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));

1564 gain_max = FFMIN(100000.f, gain_max);

1565 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

1566 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];

1567 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);

1568 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);

1569 }

1570 sum[0] = sum[1] = 0.0f;

1571 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

1572 sum[0] += sbr->e_origmapped[e][m];

1573 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]

1574 + sbr->s_m[e][m] * sbr->s_m[e][m]

1575 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];

1576 }

1577 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));

1578 gain_boost = FFMIN(1.584893192f, gain_boost);

1579 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

1580 sbr->gain[e][m] *= gain_boost;

1581 sbr->q_m[e][m] *= gain_boost;

1582 sbr->s_m[e][m] *= gain_boost;

1583 }

1584 }

1585 }

1586 }

1587

1588 /// Assembling HF Signals (14496-3 sp04 p220)

1589 static void sbr_hf_assemble(float Y1[38][64][2],

1590 const float X_high[64][40][2],

1591 SpectralBandReplication *sbr, SBRData *ch_data,

1592 const int e_a[2])

1593 {

1594 int e, i, j, m;

1595 const int h_SL = 4 * !sbr->bs_smoothing_mode;

1596 const int kx = sbr->kx[1];

1597 const int m_max = sbr->m[1];

1598 static const float h_smooth[5] = {

1599 0.33333333333333,

1600 0.30150283239582,

1601 0.21816949906249,

1602 0.11516383427084,

1603 0.03183050093751,

1604 };

1605 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;

1606 int indexnoise = ch_data->f_indexnoise;

1607 int indexsine = ch_data->f_indexsine;

1608

1609 if (sbr->reset) {

1610 for (i = 0; i < h_SL; i++) {

1611 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));

1612 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));

1613 }

1614 } else if (h_SL) {

1615 for (i = 0; i < 4; i++) {

1616 memcpy(g_temp[i + 2 * ch_data->t_env[0]],

1617 g_temp[i + 2 * ch_data->t_env_num_env_old],

1618 sizeof(g_temp[0]));

1619 memcpy(q_temp[i + 2 * ch_data->t_env[0]],

1620 q_temp[i + 2 * ch_data->t_env_num_env_old],

1621 sizeof(q_temp[0]));

1622 }

1623 }

1624

1625 for (e = 0; e < ch_data->bs_num_env; e++) {

1626 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {

1627 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));

1628 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));

1629 }

1630 }

1631

1632 for (e = 0; e < ch_data->bs_num_env; e++) {

1633 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {

1634 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);

1635 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);

1636 float *g_filt, *q_filt;

1637

1638 if (h_SL && e != e_a[0] && e != e_a[1]) {

1639 g_filt = g_filt_tab;

1640 q_filt = q_filt_tab;

1641 for (m = 0; m < m_max; m++) {

1642 const int idx1 = i + h_SL;

1643 g_filt[m] = 0.0f;

1644 q_filt[m] = 0.0f;

1645 for (j = 0; j <= h_SL; j++) {

1646 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];

1647 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];

1648 }

1649 }

1650 } else {

1651 g_filt = g_temp[i + h_SL];

1652 q_filt = q_temp[i];

1653 }

1654

1655 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,

1656 i + ENVELOPE_ADJUSTMENT_OFFSET);

1657

1658 if (e != e_a[0] && e != e_a[1]) {

1659 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],

1660 q_filt, indexnoise,

1661 kx, m_max);

1662 } else {

1663 int idx = indexsine&1;

1664 int A = (1-((indexsine+(kx & 1))&2));

1665 int B = (A^(-idx)) + idx;

1666 float *out = &Y1[i][kx][idx];

1667 float *in = sbr->s_m[e];

1668 for (m = 0; m+1 < m_max; m+=2) {

1669 out[2*m ] += in[m ] * A;

1670 out[2*m+2] += in[m+1] * B;

1671 }

1672 if(m_max&1)

1673 out[2*m ] += in[m ] * A;

1674 }

1675 indexnoise = (indexnoise + m_max) & 0x1ff;

1676 indexsine = (indexsine + 1) & 3;

1677 }

1678 }

1679 ch_data->f_indexnoise = indexnoise;

1680 ch_data->f_indexsine = indexsine;

1681 }

1682

1683 void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,

1684 float* L, float* R)

1685 {

1686 int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;

1687 int ch;

1688 int nch = (id_aac == TYPE_CPE) ? 2 : 1;

1689 int err;

1690

1691 if (!sbr->kx_and_m_pushed) {

1692 sbr->kx[0] = sbr->kx[1];

1693 sbr->m[0] = sbr->m[1];

1694 } else {

1695 sbr->kx_and_m_pushed = 0;

1696 }

1697

1698 if (sbr->start) {

1699 sbr_dequant(sbr, id_aac);

1700 }

1701 for (ch = 0; ch < nch; ch++) {

1702 /* decode channel */

1703 sbr_qmf_analysis(ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,

1704 (float*)sbr->qmf_filter_scratch,

1705 sbr->data[ch].W, sbr->data[ch].Ypos);

1706 sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low,

1707 (const float (*)[32][32][2]) sbr->data[ch].W,

1708 sbr->data[ch].Ypos);

1709 sbr->data[ch].Ypos ^= 1;

1710 if (sbr->start) {

1711 sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,

1712 (const float (*)[40][2]) sbr->X_low, sbr->k[0]);

1713 sbr_chirp(sbr, &sbr->data[ch]);

1714 sbr_hf_gen(ac, sbr, sbr->X_high,

1715 (const float (*)[40][2]) sbr->X_low,

1716 (const float (*)[2]) sbr->alpha0,

1717 (const float (*)[2]) sbr->alpha1,

1718 sbr->data[ch].bw_array, sbr->data[ch].t_env,

1719 sbr->data[ch].bs_num_env);

1720

1721 // hf_adj

1722 err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

1723 if (!err) {

1724 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);

1725 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

1726 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],

1727 (const float (*)[40][2]) sbr->X_high,

1728 sbr, &sbr->data[ch],

1729 sbr->data[ch].e_a);

1730 }

1731 }

1732

1733 /* synthesis */

1734 sbr->c.sbr_x_gen(sbr, sbr->X[ch],

1735 (const float (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],

1736 (const float (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos],

1737 (const float (*)[40][2]) sbr->X_low, ch);

1738 }

1739

1740 if (ac->oc[1].m4ac.ps == 1) {

1741 if (sbr->ps.start) {

1742 ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);

1743 } else {

1744 memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));

1745 }

1746 nch = 2;

1747 }

1748

1749 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,

1750 L, sbr->X[0], sbr->qmf_filter_scratch,

1751 sbr->data[0].synthesis_filterbank_samples,

1752 &sbr->data[0].synthesis_filterbank_samples_offset,

1753 downsampled);

1754 if (nch == 2)

1755 sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,

1756 R, sbr->X[1], sbr->qmf_filter_scratch,

1757 sbr->data[1].synthesis_filterbank_samples,

1758 &sbr->data[1].synthesis_filterbank_samples_offset,

1759 downsampled);

1760 }

1761

1762 static void aacsbr_func_ptr_init(AACSBRContext *c)

1763 {

1764 c->sbr_lf_gen = sbr_lf_gen;

1765 c->sbr_hf_assemble = sbr_hf_assemble;

1766 c->sbr_x_gen = sbr_x_gen;

1767 c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;

1768

1769 if(ARCH_MIPS)

1770 ff_aacsbr_func_ptr_init_mips(c);

1771 }

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