| 1 | /* |
| 2 | * AAC decoder |
| 3 | * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) |
| 4 | * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com ) |
| 5 | * Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com> |
| 6 | * |
| 7 | * AAC LATM decoder |
| 8 | * Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz> |
| 9 | * Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net> |
| 10 | * |
| 11 | * This file is part of FFmpeg. |
| 12 | * |
| 13 | * FFmpeg is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU Lesser General Public |
| 15 | * License as published by the Free Software Foundation; either |
| 16 | * version 2.1 of the License, or (at your option) any later version. |
| 17 | * |
| 18 | * FFmpeg is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | * Lesser General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU Lesser General Public |
| 24 | * License along with FFmpeg; if not, write to the Free Software |
| 25 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 26 | */ |
| 27 | |
| 28 | /** |
| 29 | * @file |
| 30 | * AAC decoder |
| 31 | * @author Oded Shimon ( ods15 ods15 dyndns org ) |
| 32 | * @author Maxim Gavrilov ( maxim.gavrilov gmail com ) |
| 33 | */ |
| 34 | |
| 35 | /* |
| 36 | * supported tools |
| 37 | * |
| 38 | * Support? Name |
| 39 | * N (code in SoC repo) gain control |
| 40 | * Y block switching |
| 41 | * Y window shapes - standard |
| 42 | * N window shapes - Low Delay |
| 43 | * Y filterbank - standard |
| 44 | * N (code in SoC repo) filterbank - Scalable Sample Rate |
| 45 | * Y Temporal Noise Shaping |
| 46 | * Y Long Term Prediction |
| 47 | * Y intensity stereo |
| 48 | * Y channel coupling |
| 49 | * Y frequency domain prediction |
| 50 | * Y Perceptual Noise Substitution |
| 51 | * Y Mid/Side stereo |
| 52 | * N Scalable Inverse AAC Quantization |
| 53 | * N Frequency Selective Switch |
| 54 | * N upsampling filter |
| 55 | * Y quantization & coding - AAC |
| 56 | * N quantization & coding - TwinVQ |
| 57 | * N quantization & coding - BSAC |
| 58 | * N AAC Error Resilience tools |
| 59 | * N Error Resilience payload syntax |
| 60 | * N Error Protection tool |
| 61 | * N CELP |
| 62 | * N Silence Compression |
| 63 | * N HVXC |
| 64 | * N HVXC 4kbits/s VR |
| 65 | * N Structured Audio tools |
| 66 | * N Structured Audio Sample Bank Format |
| 67 | * N MIDI |
| 68 | * N Harmonic and Individual Lines plus Noise |
| 69 | * N Text-To-Speech Interface |
| 70 | * Y Spectral Band Replication |
| 71 | * Y (not in this code) Layer-1 |
| 72 | * Y (not in this code) Layer-2 |
| 73 | * Y (not in this code) Layer-3 |
| 74 | * N SinuSoidal Coding (Transient, Sinusoid, Noise) |
| 75 | * Y Parametric Stereo |
| 76 | * N Direct Stream Transfer |
| 77 | * Y Enhanced AAC Low Delay (ER AAC ELD) |
| 78 | * |
| 79 | * Note: - HE AAC v1 comprises LC AAC with Spectral Band Replication. |
| 80 | * - HE AAC v2 comprises LC AAC with Spectral Band Replication and |
| 81 | Parametric Stereo. |
| 82 | */ |
| 83 | |
| 84 | #include "libavutil/float_dsp.h" |
| 85 | #include "libavutil/opt.h" |
| 86 | #include "avcodec.h" |
| 87 | #include "internal.h" |
| 88 | #include "get_bits.h" |
| 89 | #include "fft.h" |
| 90 | #include "fmtconvert.h" |
| 91 | #include "lpc.h" |
| 92 | #include "kbdwin.h" |
| 93 | #include "sinewin.h" |
| 94 | |
| 95 | #include "aac.h" |
| 96 | #include "aactab.h" |
| 97 | #include "aacdectab.h" |
| 98 | #include "cbrt_tablegen.h" |
| 99 | #include "sbr.h" |
| 100 | #include "aacsbr.h" |
| 101 | #include "mpeg4audio.h" |
| 102 | #include "aacadtsdec.h" |
| 103 | #include "libavutil/intfloat.h" |
| 104 | |
| 105 | #include <assert.h> |
| 106 | #include <errno.h> |
| 107 | #include <math.h> |
| 108 | #include <stdint.h> |
| 109 | #include <string.h> |
| 110 | |
| 111 | #if ARCH_ARM |
| 112 | # include "arm/aac.h" |
| 113 | #elif ARCH_MIPS |
| 114 | # include "mips/aacdec_mips.h" |
| 115 | #endif |
| 116 | |
| 117 | static VLC vlc_scalefactors; |
| 118 | static VLC vlc_spectral[11]; |
| 119 | |
| 120 | static int output_configure(AACContext *ac, |
| 121 | uint8_t layout_map[MAX_ELEM_ID*4][3], int tags, |
| 122 | enum OCStatus oc_type, int get_new_frame); |
| 123 | |
| 124 | #define overread_err "Input buffer exhausted before END element found\n" |
| 125 | |
| 126 | static int count_channels(uint8_t (*layout)[3], int tags) |
| 127 | { |
| 128 | int i, sum = 0; |
| 129 | for (i = 0; i < tags; i++) { |
| 130 | int syn_ele = layout[i][0]; |
| 131 | int pos = layout[i][2]; |
| 132 | sum += (1 + (syn_ele == TYPE_CPE)) * |
| 133 | (pos != AAC_CHANNEL_OFF && pos != AAC_CHANNEL_CC); |
| 134 | } |
| 135 | return sum; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Check for the channel element in the current channel position configuration. |
| 140 | * If it exists, make sure the appropriate element is allocated and map the |
| 141 | * channel order to match the internal FFmpeg channel layout. |
| 142 | * |
| 143 | * @param che_pos current channel position configuration |
| 144 | * @param type channel element type |
| 145 | * @param id channel element id |
| 146 | * @param channels count of the number of channels in the configuration |
| 147 | * |
| 148 | * @return Returns error status. 0 - OK, !0 - error |
| 149 | */ |
| 150 | static av_cold int che_configure(AACContext *ac, |
| 151 | enum ChannelPosition che_pos, |
| 152 | int type, int id, int *channels) |
| 153 | { |
| 154 | if (*channels >= MAX_CHANNELS) |
| 155 | return AVERROR_INVALIDDATA; |
| 156 | if (che_pos) { |
| 157 | if (!ac->che[type][id]) { |
| 158 | if (!(ac->che[type][id] = av_mallocz(sizeof(ChannelElement)))) |
| 159 | return AVERROR(ENOMEM); |
| 160 | ff_aac_sbr_ctx_init(ac, &ac->che[type][id]->sbr); |
| 161 | } |
| 162 | if (type != TYPE_CCE) { |
| 163 | if (*channels >= MAX_CHANNELS - (type == TYPE_CPE || (type == TYPE_SCE && ac->oc[1].m4ac.ps == 1))) { |
| 164 | av_log(ac->avctx, AV_LOG_ERROR, "Too many channels\n"); |
| 165 | return AVERROR_INVALIDDATA; |
| 166 | } |
| 167 | ac->output_element[(*channels)++] = &ac->che[type][id]->ch[0]; |
| 168 | if (type == TYPE_CPE || |
| 169 | (type == TYPE_SCE && ac->oc[1].m4ac.ps == 1)) { |
| 170 | ac->output_element[(*channels)++] = &ac->che[type][id]->ch[1]; |
| 171 | } |
| 172 | } |
| 173 | } else { |
| 174 | if (ac->che[type][id]) |
| 175 | ff_aac_sbr_ctx_close(&ac->che[type][id]->sbr); |
| 176 | av_freep(&ac->che[type][id]); |
| 177 | } |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | static int frame_configure_elements(AVCodecContext *avctx) |
| 182 | { |
| 183 | AACContext *ac = avctx->priv_data; |
| 184 | int type, id, ch, ret; |
| 185 | |
| 186 | /* set channel pointers to internal buffers by default */ |
| 187 | for (type = 0; type < 4; type++) { |
| 188 | for (id = 0; id < MAX_ELEM_ID; id++) { |
| 189 | ChannelElement *che = ac->che[type][id]; |
| 190 | if (che) { |
| 191 | che->ch[0].ret = che->ch[0].ret_buf; |
| 192 | che->ch[1].ret = che->ch[1].ret_buf; |
| 193 | } |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /* get output buffer */ |
| 198 | av_frame_unref(ac->frame); |
| 199 | if (!avctx->channels) |
| 200 | return 1; |
| 201 | |
| 202 | ac->frame->nb_samples = 2048; |
| 203 | if ((ret = ff_get_buffer(avctx, ac->frame, 0)) < 0) |
| 204 | return ret; |
| 205 | |
| 206 | /* map output channel pointers to AVFrame data */ |
| 207 | for (ch = 0; ch < avctx->channels; ch++) { |
| 208 | if (ac->output_element[ch]) |
| 209 | ac->output_element[ch]->ret = (float *)ac->frame->extended_data[ch]; |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | struct elem_to_channel { |
| 216 | uint64_t av_position; |
| 217 | uint8_t syn_ele; |
| 218 | uint8_t elem_id; |
| 219 | uint8_t aac_position; |
| 220 | }; |
| 221 | |
| 222 | static int assign_pair(struct elem_to_channel e2c_vec[MAX_ELEM_ID], |
| 223 | uint8_t (*layout_map)[3], int offset, uint64_t left, |
| 224 | uint64_t right, int pos) |
| 225 | { |
| 226 | if (layout_map[offset][0] == TYPE_CPE) { |
| 227 | e2c_vec[offset] = (struct elem_to_channel) { |
| 228 | .av_position = left | right, |
| 229 | .syn_ele = TYPE_CPE, |
| 230 | .elem_id = layout_map[offset][1], |
| 231 | .aac_position = pos |
| 232 | }; |
| 233 | return 1; |
| 234 | } else { |
| 235 | e2c_vec[offset] = (struct elem_to_channel) { |
| 236 | .av_position = left, |
| 237 | .syn_ele = TYPE_SCE, |
| 238 | .elem_id = layout_map[offset][1], |
| 239 | .aac_position = pos |
| 240 | }; |
| 241 | e2c_vec[offset + 1] = (struct elem_to_channel) { |
| 242 | .av_position = right, |
| 243 | .syn_ele = TYPE_SCE, |
| 244 | .elem_id = layout_map[offset + 1][1], |
| 245 | .aac_position = pos |
| 246 | }; |
| 247 | return 2; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | static int count_paired_channels(uint8_t (*layout_map)[3], int tags, int pos, |
| 252 | int *current) |
| 253 | { |
| 254 | int num_pos_channels = 0; |
| 255 | int first_cpe = 0; |
| 256 | int sce_parity = 0; |
| 257 | int i; |
| 258 | for (i = *current; i < tags; i++) { |
| 259 | if (layout_map[i][2] != pos) |
| 260 | break; |
| 261 | if (layout_map[i][0] == TYPE_CPE) { |
| 262 | if (sce_parity) { |
| 263 | if (pos == AAC_CHANNEL_FRONT && !first_cpe) { |
| 264 | sce_parity = 0; |
| 265 | } else { |
| 266 | return -1; |
| 267 | } |
| 268 | } |
| 269 | num_pos_channels += 2; |
| 270 | first_cpe = 1; |
| 271 | } else { |
| 272 | num_pos_channels++; |
| 273 | sce_parity ^= 1; |
| 274 | } |
| 275 | } |
| 276 | if (sce_parity && |
| 277 | ((pos == AAC_CHANNEL_FRONT && first_cpe) || pos == AAC_CHANNEL_SIDE)) |
| 278 | return -1; |
| 279 | *current = i; |
| 280 | return num_pos_channels; |
| 281 | } |
| 282 | |
| 283 | static uint64_t sniff_channel_order(uint8_t (*layout_map)[3], int tags) |
| 284 | { |
| 285 | int i, n, total_non_cc_elements; |
| 286 | struct elem_to_channel e2c_vec[4 * MAX_ELEM_ID] = { { 0 } }; |
| 287 | int num_front_channels, num_side_channels, num_back_channels; |
| 288 | uint64_t layout; |
| 289 | |
| 290 | if (FF_ARRAY_ELEMS(e2c_vec) < tags) |
| 291 | return 0; |
| 292 | |
| 293 | i = 0; |
| 294 | num_front_channels = |
| 295 | count_paired_channels(layout_map, tags, AAC_CHANNEL_FRONT, &i); |
| 296 | if (num_front_channels < 0) |
| 297 | return 0; |
| 298 | num_side_channels = |
| 299 | count_paired_channels(layout_map, tags, AAC_CHANNEL_SIDE, &i); |
| 300 | if (num_side_channels < 0) |
| 301 | return 0; |
| 302 | num_back_channels = |
| 303 | count_paired_channels(layout_map, tags, AAC_CHANNEL_BACK, &i); |
| 304 | if (num_back_channels < 0) |
| 305 | return 0; |
| 306 | |
| 307 | i = 0; |
| 308 | if (num_front_channels & 1) { |
| 309 | e2c_vec[i] = (struct elem_to_channel) { |
| 310 | .av_position = AV_CH_FRONT_CENTER, |
| 311 | .syn_ele = TYPE_SCE, |
| 312 | .elem_id = layout_map[i][1], |
| 313 | .aac_position = AAC_CHANNEL_FRONT |
| 314 | }; |
| 315 | i++; |
| 316 | num_front_channels--; |
| 317 | } |
| 318 | if (num_front_channels >= 4) { |
| 319 | i += assign_pair(e2c_vec, layout_map, i, |
| 320 | AV_CH_FRONT_LEFT_OF_CENTER, |
| 321 | AV_CH_FRONT_RIGHT_OF_CENTER, |
| 322 | AAC_CHANNEL_FRONT); |
| 323 | num_front_channels -= 2; |
| 324 | } |
| 325 | if (num_front_channels >= 2) { |
| 326 | i += assign_pair(e2c_vec, layout_map, i, |
| 327 | AV_CH_FRONT_LEFT, |
| 328 | AV_CH_FRONT_RIGHT, |
| 329 | AAC_CHANNEL_FRONT); |
| 330 | num_front_channels -= 2; |
| 331 | } |
| 332 | while (num_front_channels >= 2) { |
| 333 | i += assign_pair(e2c_vec, layout_map, i, |
| 334 | UINT64_MAX, |
| 335 | UINT64_MAX, |
| 336 | AAC_CHANNEL_FRONT); |
| 337 | num_front_channels -= 2; |
| 338 | } |
| 339 | |
| 340 | if (num_side_channels >= 2) { |
| 341 | i += assign_pair(e2c_vec, layout_map, i, |
| 342 | AV_CH_SIDE_LEFT, |
| 343 | AV_CH_SIDE_RIGHT, |
| 344 | AAC_CHANNEL_FRONT); |
| 345 | num_side_channels -= 2; |
| 346 | } |
| 347 | while (num_side_channels >= 2) { |
| 348 | i += assign_pair(e2c_vec, layout_map, i, |
| 349 | UINT64_MAX, |
| 350 | UINT64_MAX, |
| 351 | AAC_CHANNEL_SIDE); |
| 352 | num_side_channels -= 2; |
| 353 | } |
| 354 | |
| 355 | while (num_back_channels >= 4) { |
| 356 | i += assign_pair(e2c_vec, layout_map, i, |
| 357 | UINT64_MAX, |
| 358 | UINT64_MAX, |
| 359 | AAC_CHANNEL_BACK); |
| 360 | num_back_channels -= 2; |
| 361 | } |
| 362 | if (num_back_channels >= 2) { |
| 363 | i += assign_pair(e2c_vec, layout_map, i, |
| 364 | AV_CH_BACK_LEFT, |
| 365 | AV_CH_BACK_RIGHT, |
| 366 | AAC_CHANNEL_BACK); |
| 367 | num_back_channels -= 2; |
| 368 | } |
| 369 | if (num_back_channels) { |
| 370 | e2c_vec[i] = (struct elem_to_channel) { |
| 371 | .av_position = AV_CH_BACK_CENTER, |
| 372 | .syn_ele = TYPE_SCE, |
| 373 | .elem_id = layout_map[i][1], |
| 374 | .aac_position = AAC_CHANNEL_BACK |
| 375 | }; |
| 376 | i++; |
| 377 | num_back_channels--; |
| 378 | } |
| 379 | |
| 380 | if (i < tags && layout_map[i][2] == AAC_CHANNEL_LFE) { |
| 381 | e2c_vec[i] = (struct elem_to_channel) { |
| 382 | .av_position = AV_CH_LOW_FREQUENCY, |
| 383 | .syn_ele = TYPE_LFE, |
| 384 | .elem_id = layout_map[i][1], |
| 385 | .aac_position = AAC_CHANNEL_LFE |
| 386 | }; |
| 387 | i++; |
| 388 | } |
| 389 | while (i < tags && layout_map[i][2] == AAC_CHANNEL_LFE) { |
| 390 | e2c_vec[i] = (struct elem_to_channel) { |
| 391 | .av_position = UINT64_MAX, |
| 392 | .syn_ele = TYPE_LFE, |
| 393 | .elem_id = layout_map[i][1], |
| 394 | .aac_position = AAC_CHANNEL_LFE |
| 395 | }; |
| 396 | i++; |
| 397 | } |
| 398 | |
| 399 | // Must choose a stable sort |
| 400 | total_non_cc_elements = n = i; |
| 401 | do { |
| 402 | int next_n = 0; |
| 403 | for (i = 1; i < n; i++) |
| 404 | if (e2c_vec[i - 1].av_position > e2c_vec[i].av_position) { |
| 405 | FFSWAP(struct elem_to_channel, e2c_vec[i - 1], e2c_vec[i]); |
| 406 | next_n = i; |
| 407 | } |
| 408 | n = next_n; |
| 409 | } while (n > 0); |
| 410 | |
| 411 | layout = 0; |
| 412 | for (i = 0; i < total_non_cc_elements; i++) { |
| 413 | layout_map[i][0] = e2c_vec[i].syn_ele; |
| 414 | layout_map[i][1] = e2c_vec[i].elem_id; |
| 415 | layout_map[i][2] = e2c_vec[i].aac_position; |
| 416 | if (e2c_vec[i].av_position != UINT64_MAX) { |
| 417 | layout |= e2c_vec[i].av_position; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | return layout; |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * Save current output configuration if and only if it has been locked. |
| 426 | */ |
| 427 | static void push_output_configuration(AACContext *ac) { |
| 428 | if (ac->oc[1].status == OC_LOCKED) { |
| 429 | ac->oc[0] = ac->oc[1]; |
| 430 | } |
| 431 | ac->oc[1].status = OC_NONE; |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Restore the previous output configuration if and only if the current |
| 436 | * configuration is unlocked. |
| 437 | */ |
| 438 | static void pop_output_configuration(AACContext *ac) { |
| 439 | if (ac->oc[1].status != OC_LOCKED && ac->oc[0].status != OC_NONE) { |
| 440 | ac->oc[1] = ac->oc[0]; |
| 441 | ac->avctx->channels = ac->oc[1].channels; |
| 442 | ac->avctx->channel_layout = ac->oc[1].channel_layout; |
| 443 | output_configure(ac, ac->oc[1].layout_map, ac->oc[1].layout_map_tags, |
| 444 | ac->oc[1].status, 0); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * Configure output channel order based on the current program |
| 450 | * configuration element. |
| 451 | * |
| 452 | * @return Returns error status. 0 - OK, !0 - error |
| 453 | */ |
| 454 | static int output_configure(AACContext *ac, |
| 455 | uint8_t layout_map[MAX_ELEM_ID * 4][3], int tags, |
| 456 | enum OCStatus oc_type, int get_new_frame) |
| 457 | { |
| 458 | AVCodecContext *avctx = ac->avctx; |
| 459 | int i, channels = 0, ret; |
| 460 | uint64_t layout = 0; |
| 461 | |
| 462 | if (ac->oc[1].layout_map != layout_map) { |
| 463 | memcpy(ac->oc[1].layout_map, layout_map, tags * sizeof(layout_map[0])); |
| 464 | ac->oc[1].layout_map_tags = tags; |
| 465 | } |
| 466 | |
| 467 | // Try to sniff a reasonable channel order, otherwise output the |
| 468 | // channels in the order the PCE declared them. |
| 469 | if (avctx->request_channel_layout != AV_CH_LAYOUT_NATIVE) |
| 470 | layout = sniff_channel_order(layout_map, tags); |
| 471 | for (i = 0; i < tags; i++) { |
| 472 | int type = layout_map[i][0]; |
| 473 | int id = layout_map[i][1]; |
| 474 | int position = layout_map[i][2]; |
| 475 | // Allocate or free elements depending on if they are in the |
| 476 | // current program configuration. |
| 477 | ret = che_configure(ac, position, type, id, &channels); |
| 478 | if (ret < 0) |
| 479 | return ret; |
| 480 | } |
| 481 | if (ac->oc[1].m4ac.ps == 1 && channels == 2) { |
| 482 | if (layout == AV_CH_FRONT_CENTER) { |
| 483 | layout = AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT; |
| 484 | } else { |
| 485 | layout = 0; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | memcpy(ac->tag_che_map, ac->che, 4 * MAX_ELEM_ID * sizeof(ac->che[0][0])); |
| 490 | if (layout) avctx->channel_layout = layout; |
| 491 | ac->oc[1].channel_layout = layout; |
| 492 | avctx->channels = ac->oc[1].channels = channels; |
| 493 | ac->oc[1].status = oc_type; |
| 494 | |
| 495 | if (get_new_frame) { |
| 496 | if ((ret = frame_configure_elements(ac->avctx)) < 0) |
| 497 | return ret; |
| 498 | } |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | static void flush(AVCodecContext *avctx) |
| 504 | { |
| 505 | AACContext *ac= avctx->priv_data; |
| 506 | int type, i, j; |
| 507 | |
| 508 | for (type = 3; type >= 0; type--) { |
| 509 | for (i = 0; i < MAX_ELEM_ID; i++) { |
| 510 | ChannelElement *che = ac->che[type][i]; |
| 511 | if (che) { |
| 512 | for (j = 0; j <= 1; j++) { |
| 513 | memset(che->ch[j].saved, 0, sizeof(che->ch[j].saved)); |
| 514 | } |
| 515 | } |
| 516 | } |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * Set up channel positions based on a default channel configuration |
| 522 | * as specified in table 1.17. |
| 523 | * |
| 524 | * @return Returns error status. 0 - OK, !0 - error |
| 525 | */ |
| 526 | static int set_default_channel_config(AVCodecContext *avctx, |
| 527 | uint8_t (*layout_map)[3], |
| 528 | int *tags, |
| 529 | int channel_config) |
| 530 | { |
| 531 | if (channel_config < 1 || channel_config > 7) { |
| 532 | av_log(avctx, AV_LOG_ERROR, |
| 533 | "invalid default channel configuration (%d)\n", |
| 534 | channel_config); |
| 535 | return AVERROR_INVALIDDATA; |
| 536 | } |
| 537 | *tags = tags_per_config[channel_config]; |
| 538 | memcpy(layout_map, aac_channel_layout_map[channel_config - 1], |
| 539 | *tags * sizeof(*layout_map)); |
| 540 | |
| 541 | /* |
| 542 | * AAC specification has 7.1(wide) as a default layout for 8-channel streams. |
| 543 | * However, at least Nero AAC encoder encodes 7.1 streams using the default |
| 544 | * channel config 7, mapping the side channels of the original audio stream |
| 545 | * to the second AAC_CHANNEL_FRONT pair in the AAC stream. Similarly, e.g. FAAD |
| 546 | * decodes the second AAC_CHANNEL_FRONT pair as side channels, therefore decoding |
| 547 | * the incorrect streams as if they were correct (and as the encoder intended). |
| 548 | * |
| 549 | * As actual intended 7.1(wide) streams are very rare, default to assuming a |
| 550 | * 7.1 layout was intended. |
| 551 | */ |
| 552 | if (channel_config == 7 && avctx->strict_std_compliance < FF_COMPLIANCE_STRICT) { |
| 553 | av_log(avctx, AV_LOG_INFO, "Assuming an incorrectly encoded 7.1 channel layout" |
| 554 | " instead of a spec-compliant 7.1(wide) layout, use -strict %d to decode" |
| 555 | " according to the specification instead.\n", FF_COMPLIANCE_STRICT); |
| 556 | layout_map[2][2] = AAC_CHANNEL_SIDE; |
| 557 | } |
| 558 | |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | static ChannelElement *get_che(AACContext *ac, int type, int elem_id) |
| 563 | { |
| 564 | /* For PCE based channel configurations map the channels solely based |
| 565 | * on tags. */ |
| 566 | if (!ac->oc[1].m4ac.chan_config) { |
| 567 | return ac->tag_che_map[type][elem_id]; |
| 568 | } |
| 569 | // Allow single CPE stereo files to be signalled with mono configuration. |
| 570 | if (!ac->tags_mapped && type == TYPE_CPE && |
| 571 | ac->oc[1].m4ac.chan_config == 1) { |
| 572 | uint8_t layout_map[MAX_ELEM_ID*4][3]; |
| 573 | int layout_map_tags; |
| 574 | push_output_configuration(ac); |
| 575 | |
| 576 | av_log(ac->avctx, AV_LOG_DEBUG, "mono with CPE\n"); |
| 577 | |
| 578 | if (set_default_channel_config(ac->avctx, layout_map, |
| 579 | &layout_map_tags, 2) < 0) |
| 580 | return NULL; |
| 581 | if (output_configure(ac, layout_map, layout_map_tags, |
| 582 | OC_TRIAL_FRAME, 1) < 0) |
| 583 | return NULL; |
| 584 | |
| 585 | ac->oc[1].m4ac.chan_config = 2; |
| 586 | ac->oc[1].m4ac.ps = 0; |
| 587 | } |
| 588 | // And vice-versa |
| 589 | if (!ac->tags_mapped && type == TYPE_SCE && |
| 590 | ac->oc[1].m4ac.chan_config == 2) { |
| 591 | uint8_t layout_map[MAX_ELEM_ID * 4][3]; |
| 592 | int layout_map_tags; |
| 593 | push_output_configuration(ac); |
| 594 | |
| 595 | av_log(ac->avctx, AV_LOG_DEBUG, "stereo with SCE\n"); |
| 596 | |
| 597 | if (set_default_channel_config(ac->avctx, layout_map, |
| 598 | &layout_map_tags, 1) < 0) |
| 599 | return NULL; |
| 600 | if (output_configure(ac, layout_map, layout_map_tags, |
| 601 | OC_TRIAL_FRAME, 1) < 0) |
| 602 | return NULL; |
| 603 | |
| 604 | ac->oc[1].m4ac.chan_config = 1; |
| 605 | if (ac->oc[1].m4ac.sbr) |
| 606 | ac->oc[1].m4ac.ps = -1; |
| 607 | } |
| 608 | /* For indexed channel configurations map the channels solely based |
| 609 | * on position. */ |
| 610 | switch (ac->oc[1].m4ac.chan_config) { |
| 611 | case 7: |
| 612 | if (ac->tags_mapped == 3 && type == TYPE_CPE) { |
| 613 | ac->tags_mapped++; |
| 614 | return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2]; |
| 615 | } |
| 616 | case 6: |
| 617 | /* Some streams incorrectly code 5.1 audio as |
| 618 | * SCE[0] CPE[0] CPE[1] SCE[1] |
| 619 | * instead of |
| 620 | * SCE[0] CPE[0] CPE[1] LFE[0]. |
| 621 | * If we seem to have encountered such a stream, transfer |
| 622 | * the LFE[0] element to the SCE[1]'s mapping */ |
| 623 | if (ac->tags_mapped == tags_per_config[ac->oc[1].m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) { |
| 624 | if (!ac->warned_remapping_once && (type != TYPE_LFE || elem_id != 0)) { |
| 625 | av_log(ac->avctx, AV_LOG_WARNING, |
| 626 | "This stream seems to incorrectly report its last channel as %s[%d], mapping to LFE[0]\n", |
| 627 | type == TYPE_SCE ? "SCE" : "LFE", elem_id); |
| 628 | ac->warned_remapping_once++; |
| 629 | } |
| 630 | ac->tags_mapped++; |
| 631 | return ac->tag_che_map[type][elem_id] = ac->che[TYPE_LFE][0]; |
| 632 | } |
| 633 | case 5: |
| 634 | if (ac->tags_mapped == 2 && type == TYPE_CPE) { |
| 635 | ac->tags_mapped++; |
| 636 | return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1]; |
| 637 | } |
| 638 | case 4: |
| 639 | /* Some streams incorrectly code 4.0 audio as |
| 640 | * SCE[0] CPE[0] LFE[0] |
| 641 | * instead of |
| 642 | * SCE[0] CPE[0] SCE[1]. |
| 643 | * If we seem to have encountered such a stream, transfer |
| 644 | * the SCE[1] element to the LFE[0]'s mapping */ |
| 645 | if (ac->tags_mapped == tags_per_config[ac->oc[1].m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) { |
| 646 | if (!ac->warned_remapping_once && (type != TYPE_SCE || elem_id != 1)) { |
| 647 | av_log(ac->avctx, AV_LOG_WARNING, |
| 648 | "This stream seems to incorrectly report its last channel as %s[%d], mapping to SCE[1]\n", |
| 649 | type == TYPE_SCE ? "SCE" : "LFE", elem_id); |
| 650 | ac->warned_remapping_once++; |
| 651 | } |
| 652 | ac->tags_mapped++; |
| 653 | return ac->tag_che_map[type][elem_id] = ac->che[TYPE_SCE][1]; |
| 654 | } |
| 655 | if (ac->tags_mapped == 2 && |
| 656 | ac->oc[1].m4ac.chan_config == 4 && |
| 657 | type == TYPE_SCE) { |
| 658 | ac->tags_mapped++; |
| 659 | return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1]; |
| 660 | } |
| 661 | case 3: |
| 662 | case 2: |
| 663 | if (ac->tags_mapped == (ac->oc[1].m4ac.chan_config != 2) && |
| 664 | type == TYPE_CPE) { |
| 665 | ac->tags_mapped++; |
| 666 | return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][0]; |
| 667 | } else if (ac->oc[1].m4ac.chan_config == 2) { |
| 668 | return NULL; |
| 669 | } |
| 670 | case 1: |
| 671 | if (!ac->tags_mapped && type == TYPE_SCE) { |
| 672 | ac->tags_mapped++; |
| 673 | return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][0]; |
| 674 | } |
| 675 | default: |
| 676 | return NULL; |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | /** |
| 681 | * Decode an array of 4 bit element IDs, optionally interleaved with a |
| 682 | * stereo/mono switching bit. |
| 683 | * |
| 684 | * @param type speaker type/position for these channels |
| 685 | */ |
| 686 | static void decode_channel_map(uint8_t layout_map[][3], |
| 687 | enum ChannelPosition type, |
| 688 | GetBitContext *gb, int n) |
| 689 | { |
| 690 | while (n--) { |
| 691 | enum RawDataBlockType syn_ele; |
| 692 | switch (type) { |
| 693 | case AAC_CHANNEL_FRONT: |
| 694 | case AAC_CHANNEL_BACK: |
| 695 | case AAC_CHANNEL_SIDE: |
| 696 | syn_ele = get_bits1(gb); |
| 697 | break; |
| 698 | case AAC_CHANNEL_CC: |
| 699 | skip_bits1(gb); |
| 700 | syn_ele = TYPE_CCE; |
| 701 | break; |
| 702 | case AAC_CHANNEL_LFE: |
| 703 | syn_ele = TYPE_LFE; |
| 704 | break; |
| 705 | default: |
| 706 | // AAC_CHANNEL_OFF has no channel map |
| 707 | av_assert0(0); |
| 708 | } |
| 709 | layout_map[0][0] = syn_ele; |
| 710 | layout_map[0][1] = get_bits(gb, 4); |
| 711 | layout_map[0][2] = type; |
| 712 | layout_map++; |
| 713 | } |
| 714 | } |
| 715 | |
| 716 | /** |
| 717 | * Decode program configuration element; reference: table 4.2. |
| 718 | * |
| 719 | * @return Returns error status. 0 - OK, !0 - error |
| 720 | */ |
| 721 | static int decode_pce(AVCodecContext *avctx, MPEG4AudioConfig *m4ac, |
| 722 | uint8_t (*layout_map)[3], |
| 723 | GetBitContext *gb) |
| 724 | { |
| 725 | int num_front, num_side, num_back, num_lfe, num_assoc_data, num_cc; |
| 726 | int sampling_index; |
| 727 | int comment_len; |
| 728 | int tags; |
| 729 | |
| 730 | skip_bits(gb, 2); // object_type |
| 731 | |
| 732 | sampling_index = get_bits(gb, 4); |
| 733 | if (m4ac->sampling_index != sampling_index) |
| 734 | av_log(avctx, AV_LOG_WARNING, |
| 735 | "Sample rate index in program config element does not " |
| 736 | "match the sample rate index configured by the container.\n"); |
| 737 | |
| 738 | num_front = get_bits(gb, 4); |
| 739 | num_side = get_bits(gb, 4); |
| 740 | num_back = get_bits(gb, 4); |
| 741 | num_lfe = get_bits(gb, 2); |
| 742 | num_assoc_data = get_bits(gb, 3); |
| 743 | num_cc = get_bits(gb, 4); |
| 744 | |
| 745 | if (get_bits1(gb)) |
| 746 | skip_bits(gb, 4); // mono_mixdown_tag |
| 747 | if (get_bits1(gb)) |
| 748 | skip_bits(gb, 4); // stereo_mixdown_tag |
| 749 | |
| 750 | if (get_bits1(gb)) |
| 751 | skip_bits(gb, 3); // mixdown_coeff_index and pseudo_surround |
| 752 | |
| 753 | if (get_bits_left(gb) < 4 * (num_front + num_side + num_back + num_lfe + num_assoc_data + num_cc)) { |
| 754 | av_log(avctx, AV_LOG_ERROR, "decode_pce: " overread_err); |
| 755 | return -1; |
| 756 | } |
| 757 | decode_channel_map(layout_map , AAC_CHANNEL_FRONT, gb, num_front); |
| 758 | tags = num_front; |
| 759 | decode_channel_map(layout_map + tags, AAC_CHANNEL_SIDE, gb, num_side); |
| 760 | tags += num_side; |
| 761 | decode_channel_map(layout_map + tags, AAC_CHANNEL_BACK, gb, num_back); |
| 762 | tags += num_back; |
| 763 | decode_channel_map(layout_map + tags, AAC_CHANNEL_LFE, gb, num_lfe); |
| 764 | tags += num_lfe; |
| 765 | |
| 766 | skip_bits_long(gb, 4 * num_assoc_data); |
| 767 | |
| 768 | decode_channel_map(layout_map + tags, AAC_CHANNEL_CC, gb, num_cc); |
| 769 | tags += num_cc; |
| 770 | |
| 771 | align_get_bits(gb); |
| 772 | |
| 773 | /* comment field, first byte is length */ |
| 774 | comment_len = get_bits(gb, 8) * 8; |
| 775 | if (get_bits_left(gb) < comment_len) { |
| 776 | av_log(avctx, AV_LOG_ERROR, "decode_pce: " overread_err); |
| 777 | return AVERROR_INVALIDDATA; |
| 778 | } |
| 779 | skip_bits_long(gb, comment_len); |
| 780 | return tags; |
| 781 | } |
| 782 | |
| 783 | /** |
| 784 | * Decode GA "General Audio" specific configuration; reference: table 4.1. |
| 785 | * |
| 786 | * @param ac pointer to AACContext, may be null |
| 787 | * @param avctx pointer to AVCCodecContext, used for logging |
| 788 | * |
| 789 | * @return Returns error status. 0 - OK, !0 - error |
| 790 | */ |
| 791 | static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx, |
| 792 | GetBitContext *gb, |
| 793 | MPEG4AudioConfig *m4ac, |
| 794 | int channel_config) |
| 795 | { |
| 796 | int extension_flag, ret, ep_config, res_flags; |
| 797 | uint8_t layout_map[MAX_ELEM_ID*4][3]; |
| 798 | int tags = 0; |
| 799 | |
| 800 | if (get_bits1(gb)) { // frameLengthFlag |
| 801 | avpriv_request_sample(avctx, "960/120 MDCT window"); |
| 802 | return AVERROR_PATCHWELCOME; |
| 803 | } |
| 804 | |
| 805 | if (get_bits1(gb)) // dependsOnCoreCoder |
| 806 | skip_bits(gb, 14); // coreCoderDelay |
| 807 | extension_flag = get_bits1(gb); |
| 808 | |
| 809 | if (m4ac->object_type == AOT_AAC_SCALABLE || |
| 810 | m4ac->object_type == AOT_ER_AAC_SCALABLE) |
| 811 | skip_bits(gb, 3); // layerNr |
| 812 | |
| 813 | if (channel_config == 0) { |
| 814 | skip_bits(gb, 4); // element_instance_tag |
| 815 | tags = decode_pce(avctx, m4ac, layout_map, gb); |
| 816 | if (tags < 0) |
| 817 | return tags; |
| 818 | } else { |
| 819 | if ((ret = set_default_channel_config(avctx, layout_map, |
| 820 | &tags, channel_config))) |
| 821 | return ret; |
| 822 | } |
| 823 | |
| 824 | if (count_channels(layout_map, tags) > 1) { |
| 825 | m4ac->ps = 0; |
| 826 | } else if (m4ac->sbr == 1 && m4ac->ps == -1) |
| 827 | m4ac->ps = 1; |
| 828 | |
| 829 | if (ac && (ret = output_configure(ac, layout_map, tags, OC_GLOBAL_HDR, 0))) |
| 830 | return ret; |
| 831 | |
| 832 | if (extension_flag) { |
| 833 | switch (m4ac->object_type) { |
| 834 | case AOT_ER_BSAC: |
| 835 | skip_bits(gb, 5); // numOfSubFrame |
| 836 | skip_bits(gb, 11); // layer_length |
| 837 | break; |
| 838 | case AOT_ER_AAC_LC: |
| 839 | case AOT_ER_AAC_LTP: |
| 840 | case AOT_ER_AAC_SCALABLE: |
| 841 | case AOT_ER_AAC_LD: |
| 842 | res_flags = get_bits(gb, 3); |
| 843 | if (res_flags) { |
| 844 | avpriv_report_missing_feature(avctx, |
| 845 | "AAC data resilience (flags %x)", |
| 846 | res_flags); |
| 847 | return AVERROR_PATCHWELCOME; |
| 848 | } |
| 849 | break; |
| 850 | } |
| 851 | skip_bits1(gb); // extensionFlag3 (TBD in version 3) |
| 852 | } |
| 853 | switch (m4ac->object_type) { |
| 854 | case AOT_ER_AAC_LC: |
| 855 | case AOT_ER_AAC_LTP: |
| 856 | case AOT_ER_AAC_SCALABLE: |
| 857 | case AOT_ER_AAC_LD: |
| 858 | ep_config = get_bits(gb, 2); |
| 859 | if (ep_config) { |
| 860 | avpriv_report_missing_feature(avctx, |
| 861 | "epConfig %d", ep_config); |
| 862 | return AVERROR_PATCHWELCOME; |
| 863 | } |
| 864 | } |
| 865 | return 0; |
| 866 | } |
| 867 | |
| 868 | static int decode_eld_specific_config(AACContext *ac, AVCodecContext *avctx, |
| 869 | GetBitContext *gb, |
| 870 | MPEG4AudioConfig *m4ac, |
| 871 | int channel_config) |
| 872 | { |
| 873 | int ret, ep_config, res_flags; |
| 874 | uint8_t layout_map[MAX_ELEM_ID*4][3]; |
| 875 | int tags = 0; |
| 876 | const int ELDEXT_TERM = 0; |
| 877 | |
| 878 | m4ac->ps = 0; |
| 879 | m4ac->sbr = 0; |
| 880 | |
| 881 | if (get_bits1(gb)) { // frameLengthFlag |
| 882 | avpriv_request_sample(avctx, "960/120 MDCT window"); |
| 883 | return AVERROR_PATCHWELCOME; |
| 884 | } |
| 885 | |
| 886 | res_flags = get_bits(gb, 3); |
| 887 | if (res_flags) { |
| 888 | avpriv_report_missing_feature(avctx, |
| 889 | "AAC data resilience (flags %x)", |
| 890 | res_flags); |
| 891 | return AVERROR_PATCHWELCOME; |
| 892 | } |
| 893 | |
| 894 | if (get_bits1(gb)) { // ldSbrPresentFlag |
| 895 | avpriv_report_missing_feature(avctx, |
| 896 | "Low Delay SBR"); |
| 897 | return AVERROR_PATCHWELCOME; |
| 898 | } |
| 899 | |
| 900 | while (get_bits(gb, 4) != ELDEXT_TERM) { |
| 901 | int len = get_bits(gb, 4); |
| 902 | if (len == 15) |
| 903 | len += get_bits(gb, 8); |
| 904 | if (len == 15 + 255) |
| 905 | len += get_bits(gb, 16); |
| 906 | if (get_bits_left(gb) < len * 8 + 4) { |
| 907 | av_log(ac->avctx, AV_LOG_ERROR, overread_err); |
| 908 | return AVERROR_INVALIDDATA; |
| 909 | } |
| 910 | skip_bits_long(gb, 8 * len); |
| 911 | } |
| 912 | |
| 913 | if ((ret = set_default_channel_config(avctx, layout_map, |
| 914 | &tags, channel_config))) |
| 915 | return ret; |
| 916 | |
| 917 | if (ac && (ret = output_configure(ac, layout_map, tags, OC_GLOBAL_HDR, 0))) |
| 918 | return ret; |
| 919 | |
| 920 | ep_config = get_bits(gb, 2); |
| 921 | if (ep_config) { |
| 922 | avpriv_report_missing_feature(avctx, |
| 923 | "epConfig %d", ep_config); |
| 924 | return AVERROR_PATCHWELCOME; |
| 925 | } |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | /** |
| 930 | * Decode audio specific configuration; reference: table 1.13. |
| 931 | * |
| 932 | * @param ac pointer to AACContext, may be null |
| 933 | * @param avctx pointer to AVCCodecContext, used for logging |
| 934 | * @param m4ac pointer to MPEG4AudioConfig, used for parsing |
| 935 | * @param data pointer to buffer holding an audio specific config |
| 936 | * @param bit_size size of audio specific config or data in bits |
| 937 | * @param sync_extension look for an appended sync extension |
| 938 | * |
| 939 | * @return Returns error status or number of consumed bits. <0 - error |
| 940 | */ |
| 941 | static int decode_audio_specific_config(AACContext *ac, |
| 942 | AVCodecContext *avctx, |
| 943 | MPEG4AudioConfig *m4ac, |
| 944 | const uint8_t *data, int bit_size, |
| 945 | int sync_extension) |
| 946 | { |
| 947 | GetBitContext gb; |
| 948 | int i, ret; |
| 949 | |
| 950 | av_dlog(avctx, "audio specific config size %d\n", bit_size >> 3); |
| 951 | for (i = 0; i < bit_size >> 3; i++) |
| 952 | av_dlog(avctx, "%02x ", data[i]); |
| 953 | av_dlog(avctx, "\n"); |
| 954 | |
| 955 | if ((ret = init_get_bits(&gb, data, bit_size)) < 0) |
| 956 | return ret; |
| 957 | |
| 958 | if ((i = avpriv_mpeg4audio_get_config(m4ac, data, bit_size, |
| 959 | sync_extension)) < 0) |
| 960 | return AVERROR_INVALIDDATA; |
| 961 | if (m4ac->sampling_index > 12) { |
| 962 | av_log(avctx, AV_LOG_ERROR, |
| 963 | "invalid sampling rate index %d\n", |
| 964 | m4ac->sampling_index); |
| 965 | return AVERROR_INVALIDDATA; |
| 966 | } |
| 967 | if (m4ac->object_type == AOT_ER_AAC_LD && |
| 968 | (m4ac->sampling_index < 3 || m4ac->sampling_index > 7)) { |
| 969 | av_log(avctx, AV_LOG_ERROR, |
| 970 | "invalid low delay sampling rate index %d\n", |
| 971 | m4ac->sampling_index); |
| 972 | return AVERROR_INVALIDDATA; |
| 973 | } |
| 974 | |
| 975 | skip_bits_long(&gb, i); |
| 976 | |
| 977 | switch (m4ac->object_type) { |
| 978 | case AOT_AAC_MAIN: |
| 979 | case AOT_AAC_LC: |
| 980 | case AOT_AAC_LTP: |
| 981 | case AOT_ER_AAC_LC: |
| 982 | case AOT_ER_AAC_LD: |
| 983 | if ((ret = decode_ga_specific_config(ac, avctx, &gb, |
| 984 | m4ac, m4ac->chan_config)) < 0) |
| 985 | return ret; |
| 986 | break; |
| 987 | case AOT_ER_AAC_ELD: |
| 988 | if ((ret = decode_eld_specific_config(ac, avctx, &gb, |
| 989 | m4ac, m4ac->chan_config)) < 0) |
| 990 | return ret; |
| 991 | break; |
| 992 | default: |
| 993 | avpriv_report_missing_feature(avctx, |
| 994 | "Audio object type %s%d", |
| 995 | m4ac->sbr == 1 ? "SBR+" : "", |
| 996 | m4ac->object_type); |
| 997 | return AVERROR(ENOSYS); |
| 998 | } |
| 999 | |
| 1000 | av_dlog(avctx, |
| 1001 | "AOT %d chan config %d sampling index %d (%d) SBR %d PS %d\n", |
| 1002 | m4ac->object_type, m4ac->chan_config, m4ac->sampling_index, |
| 1003 | m4ac->sample_rate, m4ac->sbr, |
| 1004 | m4ac->ps); |
| 1005 | |
| 1006 | return get_bits_count(&gb); |
| 1007 | } |
| 1008 | |
| 1009 | /** |
| 1010 | * linear congruential pseudorandom number generator |
| 1011 | * |
| 1012 | * @param previous_val pointer to the current state of the generator |
| 1013 | * |
| 1014 | * @return Returns a 32-bit pseudorandom integer |
| 1015 | */ |
| 1016 | static av_always_inline int lcg_random(unsigned previous_val) |
| 1017 | { |
| 1018 | union { unsigned u; int s; } v = { previous_val * 1664525u + 1013904223 }; |
| 1019 | return v.s; |
| 1020 | } |
| 1021 | |
| 1022 | static av_always_inline void reset_predict_state(PredictorState *ps) |
| 1023 | { |
| 1024 | ps->r0 = 0.0f; |
| 1025 | ps->r1 = 0.0f; |
| 1026 | ps->cor0 = 0.0f; |
| 1027 | ps->cor1 = 0.0f; |
| 1028 | ps->var0 = 1.0f; |
| 1029 | ps->var1 = 1.0f; |
| 1030 | } |
| 1031 | |
| 1032 | static void reset_all_predictors(PredictorState *ps) |
| 1033 | { |
| 1034 | int i; |
| 1035 | for (i = 0; i < MAX_PREDICTORS; i++) |
| 1036 | reset_predict_state(&ps[i]); |
| 1037 | } |
| 1038 | |
| 1039 | static int sample_rate_idx (int rate) |
| 1040 | { |
| 1041 | if (92017 <= rate) return 0; |
| 1042 | else if (75132 <= rate) return 1; |
| 1043 | else if (55426 <= rate) return 2; |
| 1044 | else if (46009 <= rate) return 3; |
| 1045 | else if (37566 <= rate) return 4; |
| 1046 | else if (27713 <= rate) return 5; |
| 1047 | else if (23004 <= rate) return 6; |
| 1048 | else if (18783 <= rate) return 7; |
| 1049 | else if (13856 <= rate) return 8; |
| 1050 | else if (11502 <= rate) return 9; |
| 1051 | else if (9391 <= rate) return 10; |
| 1052 | else return 11; |
| 1053 | } |
| 1054 | |
| 1055 | static void reset_predictor_group(PredictorState *ps, int group_num) |
| 1056 | { |
| 1057 | int i; |
| 1058 | for (i = group_num - 1; i < MAX_PREDICTORS; i += 30) |
| 1059 | reset_predict_state(&ps[i]); |
| 1060 | } |
| 1061 | |
| 1062 | #define AAC_INIT_VLC_STATIC(num, size) \ |
| 1063 | INIT_VLC_STATIC(&vlc_spectral[num], 8, ff_aac_spectral_sizes[num], \ |
| 1064 | ff_aac_spectral_bits[num], sizeof(ff_aac_spectral_bits[num][0]), \ |
| 1065 | sizeof(ff_aac_spectral_bits[num][0]), \ |
| 1066 | ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), \ |
| 1067 | sizeof(ff_aac_spectral_codes[num][0]), \ |
| 1068 | size); |
| 1069 | |
| 1070 | static void aacdec_init(AACContext *ac); |
| 1071 | |
| 1072 | static av_cold int aac_decode_init(AVCodecContext *avctx) |
| 1073 | { |
| 1074 | AACContext *ac = avctx->priv_data; |
| 1075 | int ret; |
| 1076 | |
| 1077 | ac->avctx = avctx; |
| 1078 | ac->oc[1].m4ac.sample_rate = avctx->sample_rate; |
| 1079 | |
| 1080 | aacdec_init(ac); |
| 1081 | |
| 1082 | avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; |
| 1083 | |
| 1084 | if (avctx->extradata_size > 0) { |
| 1085 | if ((ret = decode_audio_specific_config(ac, ac->avctx, &ac->oc[1].m4ac, |
| 1086 | avctx->extradata, |
| 1087 | avctx->extradata_size * 8, |
| 1088 | 1)) < 0) |
| 1089 | return ret; |
| 1090 | } else { |
| 1091 | int sr, i; |
| 1092 | uint8_t layout_map[MAX_ELEM_ID*4][3]; |
| 1093 | int layout_map_tags; |
| 1094 | |
| 1095 | sr = sample_rate_idx(avctx->sample_rate); |
| 1096 | ac->oc[1].m4ac.sampling_index = sr; |
| 1097 | ac->oc[1].m4ac.channels = avctx->channels; |
| 1098 | ac->oc[1].m4ac.sbr = -1; |
| 1099 | ac->oc[1].m4ac.ps = -1; |
| 1100 | |
| 1101 | for (i = 0; i < FF_ARRAY_ELEMS(ff_mpeg4audio_channels); i++) |
| 1102 | if (ff_mpeg4audio_channels[i] == avctx->channels) |
| 1103 | break; |
| 1104 | if (i == FF_ARRAY_ELEMS(ff_mpeg4audio_channels)) { |
| 1105 | i = 0; |
| 1106 | } |
| 1107 | ac->oc[1].m4ac.chan_config = i; |
| 1108 | |
| 1109 | if (ac->oc[1].m4ac.chan_config) { |
| 1110 | int ret = set_default_channel_config(avctx, layout_map, |
| 1111 | &layout_map_tags, ac->oc[1].m4ac.chan_config); |
| 1112 | if (!ret) |
| 1113 | output_configure(ac, layout_map, layout_map_tags, |
| 1114 | OC_GLOBAL_HDR, 0); |
| 1115 | else if (avctx->err_recognition & AV_EF_EXPLODE) |
| 1116 | return AVERROR_INVALIDDATA; |
| 1117 | } |
| 1118 | } |
| 1119 | |
| 1120 | if (avctx->channels > MAX_CHANNELS) { |
| 1121 | av_log(avctx, AV_LOG_ERROR, "Too many channels\n"); |
| 1122 | return AVERROR_INVALIDDATA; |
| 1123 | } |
| 1124 | |
| 1125 | AAC_INIT_VLC_STATIC( 0, 304); |
| 1126 | AAC_INIT_VLC_STATIC( 1, 270); |
| 1127 | AAC_INIT_VLC_STATIC( 2, 550); |
| 1128 | AAC_INIT_VLC_STATIC( 3, 300); |
| 1129 | AAC_INIT_VLC_STATIC( 4, 328); |
| 1130 | AAC_INIT_VLC_STATIC( 5, 294); |
| 1131 | AAC_INIT_VLC_STATIC( 6, 306); |
| 1132 | AAC_INIT_VLC_STATIC( 7, 268); |
| 1133 | AAC_INIT_VLC_STATIC( 8, 510); |
| 1134 | AAC_INIT_VLC_STATIC( 9, 366); |
| 1135 | AAC_INIT_VLC_STATIC(10, 462); |
| 1136 | |
| 1137 | ff_aac_sbr_init(); |
| 1138 | |
| 1139 | ff_fmt_convert_init(&ac->fmt_conv, avctx); |
| 1140 | ac->fdsp = avpriv_float_dsp_alloc(avctx->flags & CODEC_FLAG_BITEXACT); |
| 1141 | if (!ac->fdsp) { |
| 1142 | return AVERROR(ENOMEM); |
| 1143 | } |
| 1144 | |
| 1145 | ac->random_state = 0x1f2e3d4c; |
| 1146 | |
| 1147 | ff_aac_tableinit(); |
| 1148 | |
| 1149 | INIT_VLC_STATIC(&vlc_scalefactors, 7, |
| 1150 | FF_ARRAY_ELEMS(ff_aac_scalefactor_code), |
| 1151 | ff_aac_scalefactor_bits, |
| 1152 | sizeof(ff_aac_scalefactor_bits[0]), |
| 1153 | sizeof(ff_aac_scalefactor_bits[0]), |
| 1154 | ff_aac_scalefactor_code, |
| 1155 | sizeof(ff_aac_scalefactor_code[0]), |
| 1156 | sizeof(ff_aac_scalefactor_code[0]), |
| 1157 | 352); |
| 1158 | |
| 1159 | ff_mdct_init(&ac->mdct, 11, 1, 1.0 / (32768.0 * 1024.0)); |
| 1160 | ff_mdct_init(&ac->mdct_ld, 10, 1, 1.0 / (32768.0 * 512.0)); |
| 1161 | ff_mdct_init(&ac->mdct_small, 8, 1, 1.0 / (32768.0 * 128.0)); |
| 1162 | ff_mdct_init(&ac->mdct_ltp, 11, 0, -2.0 * 32768.0); |
| 1163 | // window initialization |
| 1164 | ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024); |
| 1165 | ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128); |
| 1166 | ff_init_ff_sine_windows(10); |
| 1167 | ff_init_ff_sine_windows( 9); |
| 1168 | ff_init_ff_sine_windows( 7); |
| 1169 | |
| 1170 | cbrt_tableinit(); |
| 1171 | |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
| 1175 | /** |
| 1176 | * Skip data_stream_element; reference: table 4.10. |
| 1177 | */ |
| 1178 | static int skip_data_stream_element(AACContext *ac, GetBitContext *gb) |
| 1179 | { |
| 1180 | int byte_align = get_bits1(gb); |
| 1181 | int count = get_bits(gb, 8); |
| 1182 | if (count == 255) |
| 1183 | count += get_bits(gb, 8); |
| 1184 | if (byte_align) |
| 1185 | align_get_bits(gb); |
| 1186 | |
| 1187 | if (get_bits_left(gb) < 8 * count) { |
| 1188 | av_log(ac->avctx, AV_LOG_ERROR, "skip_data_stream_element: "overread_err); |
| 1189 | return AVERROR_INVALIDDATA; |
| 1190 | } |
| 1191 | skip_bits_long(gb, 8 * count); |
| 1192 | return 0; |
| 1193 | } |
| 1194 | |
| 1195 | static int decode_prediction(AACContext *ac, IndividualChannelStream *ics, |
| 1196 | GetBitContext *gb) |
| 1197 | { |
| 1198 | int sfb; |
| 1199 | if (get_bits1(gb)) { |
| 1200 | ics->predictor_reset_group = get_bits(gb, 5); |
| 1201 | if (ics->predictor_reset_group == 0 || |
| 1202 | ics->predictor_reset_group > 30) { |
| 1203 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1204 | "Invalid Predictor Reset Group.\n"); |
| 1205 | return AVERROR_INVALIDDATA; |
| 1206 | } |
| 1207 | } |
| 1208 | for (sfb = 0; sfb < FFMIN(ics->max_sfb, ff_aac_pred_sfb_max[ac->oc[1].m4ac.sampling_index]); sfb++) { |
| 1209 | ics->prediction_used[sfb] = get_bits1(gb); |
| 1210 | } |
| 1211 | return 0; |
| 1212 | } |
| 1213 | |
| 1214 | /** |
| 1215 | * Decode Long Term Prediction data; reference: table 4.xx. |
| 1216 | */ |
| 1217 | static void decode_ltp(LongTermPrediction *ltp, |
| 1218 | GetBitContext *gb, uint8_t max_sfb) |
| 1219 | { |
| 1220 | int sfb; |
| 1221 | |
| 1222 | ltp->lag = get_bits(gb, 11); |
| 1223 | ltp->coef = ltp_coef[get_bits(gb, 3)]; |
| 1224 | for (sfb = 0; sfb < FFMIN(max_sfb, MAX_LTP_LONG_SFB); sfb++) |
| 1225 | ltp->used[sfb] = get_bits1(gb); |
| 1226 | } |
| 1227 | |
| 1228 | /** |
| 1229 | * Decode Individual Channel Stream info; reference: table 4.6. |
| 1230 | */ |
| 1231 | static int decode_ics_info(AACContext *ac, IndividualChannelStream *ics, |
| 1232 | GetBitContext *gb) |
| 1233 | { |
| 1234 | int aot = ac->oc[1].m4ac.object_type; |
| 1235 | if (aot != AOT_ER_AAC_ELD) { |
| 1236 | if (get_bits1(gb)) { |
| 1237 | av_log(ac->avctx, AV_LOG_ERROR, "Reserved bit set.\n"); |
| 1238 | return AVERROR_INVALIDDATA; |
| 1239 | } |
| 1240 | ics->window_sequence[1] = ics->window_sequence[0]; |
| 1241 | ics->window_sequence[0] = get_bits(gb, 2); |
| 1242 | if (aot == AOT_ER_AAC_LD && |
| 1243 | ics->window_sequence[0] != ONLY_LONG_SEQUENCE) { |
| 1244 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1245 | "AAC LD is only defined for ONLY_LONG_SEQUENCE but " |
| 1246 | "window sequence %d found.\n", ics->window_sequence[0]); |
| 1247 | ics->window_sequence[0] = ONLY_LONG_SEQUENCE; |
| 1248 | return AVERROR_INVALIDDATA; |
| 1249 | } |
| 1250 | ics->use_kb_window[1] = ics->use_kb_window[0]; |
| 1251 | ics->use_kb_window[0] = get_bits1(gb); |
| 1252 | } |
| 1253 | ics->num_window_groups = 1; |
| 1254 | ics->group_len[0] = 1; |
| 1255 | if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { |
| 1256 | int i; |
| 1257 | ics->max_sfb = get_bits(gb, 4); |
| 1258 | for (i = 0; i < 7; i++) { |
| 1259 | if (get_bits1(gb)) { |
| 1260 | ics->group_len[ics->num_window_groups - 1]++; |
| 1261 | } else { |
| 1262 | ics->num_window_groups++; |
| 1263 | ics->group_len[ics->num_window_groups - 1] = 1; |
| 1264 | } |
| 1265 | } |
| 1266 | ics->num_windows = 8; |
| 1267 | ics->swb_offset = ff_swb_offset_128[ac->oc[1].m4ac.sampling_index]; |
| 1268 | ics->num_swb = ff_aac_num_swb_128[ac->oc[1].m4ac.sampling_index]; |
| 1269 | ics->tns_max_bands = ff_tns_max_bands_128[ac->oc[1].m4ac.sampling_index]; |
| 1270 | ics->predictor_present = 0; |
| 1271 | } else { |
| 1272 | ics->max_sfb = get_bits(gb, 6); |
| 1273 | ics->num_windows = 1; |
| 1274 | if (aot == AOT_ER_AAC_LD || aot == AOT_ER_AAC_ELD) { |
| 1275 | ics->swb_offset = ff_swb_offset_512[ac->oc[1].m4ac.sampling_index]; |
| 1276 | ics->num_swb = ff_aac_num_swb_512[ac->oc[1].m4ac.sampling_index]; |
| 1277 | ics->tns_max_bands = ff_tns_max_bands_512[ac->oc[1].m4ac.sampling_index]; |
| 1278 | if (!ics->num_swb || !ics->swb_offset) |
| 1279 | return AVERROR_BUG; |
| 1280 | } else { |
| 1281 | ics->swb_offset = ff_swb_offset_1024[ac->oc[1].m4ac.sampling_index]; |
| 1282 | ics->num_swb = ff_aac_num_swb_1024[ac->oc[1].m4ac.sampling_index]; |
| 1283 | ics->tns_max_bands = ff_tns_max_bands_1024[ac->oc[1].m4ac.sampling_index]; |
| 1284 | } |
| 1285 | if (aot != AOT_ER_AAC_ELD) { |
| 1286 | ics->predictor_present = get_bits1(gb); |
| 1287 | ics->predictor_reset_group = 0; |
| 1288 | } |
| 1289 | if (ics->predictor_present) { |
| 1290 | if (aot == AOT_AAC_MAIN) { |
| 1291 | if (decode_prediction(ac, ics, gb)) { |
| 1292 | goto fail; |
| 1293 | } |
| 1294 | } else if (aot == AOT_AAC_LC || |
| 1295 | aot == AOT_ER_AAC_LC) { |
| 1296 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1297 | "Prediction is not allowed in AAC-LC.\n"); |
| 1298 | goto fail; |
| 1299 | } else { |
| 1300 | if (aot == AOT_ER_AAC_LD) { |
| 1301 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1302 | "LTP in ER AAC LD not yet implemented.\n"); |
| 1303 | return AVERROR_PATCHWELCOME; |
| 1304 | } |
| 1305 | if ((ics->ltp.present = get_bits(gb, 1))) |
| 1306 | decode_ltp(&ics->ltp, gb, ics->max_sfb); |
| 1307 | } |
| 1308 | } |
| 1309 | } |
| 1310 | |
| 1311 | if (ics->max_sfb > ics->num_swb) { |
| 1312 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1313 | "Number of scalefactor bands in group (%d) " |
| 1314 | "exceeds limit (%d).\n", |
| 1315 | ics->max_sfb, ics->num_swb); |
| 1316 | goto fail; |
| 1317 | } |
| 1318 | |
| 1319 | return 0; |
| 1320 | fail: |
| 1321 | ics->max_sfb = 0; |
| 1322 | return AVERROR_INVALIDDATA; |
| 1323 | } |
| 1324 | |
| 1325 | /** |
| 1326 | * Decode band types (section_data payload); reference: table 4.46. |
| 1327 | * |
| 1328 | * @param band_type array of the used band type |
| 1329 | * @param band_type_run_end array of the last scalefactor band of a band type run |
| 1330 | * |
| 1331 | * @return Returns error status. 0 - OK, !0 - error |
| 1332 | */ |
| 1333 | static int decode_band_types(AACContext *ac, enum BandType band_type[120], |
| 1334 | int band_type_run_end[120], GetBitContext *gb, |
| 1335 | IndividualChannelStream *ics) |
| 1336 | { |
| 1337 | int g, idx = 0; |
| 1338 | const int bits = (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) ? 3 : 5; |
| 1339 | for (g = 0; g < ics->num_window_groups; g++) { |
| 1340 | int k = 0; |
| 1341 | while (k < ics->max_sfb) { |
| 1342 | uint8_t sect_end = k; |
| 1343 | int sect_len_incr; |
| 1344 | int sect_band_type = get_bits(gb, 4); |
| 1345 | if (sect_band_type == 12) { |
| 1346 | av_log(ac->avctx, AV_LOG_ERROR, "invalid band type\n"); |
| 1347 | return AVERROR_INVALIDDATA; |
| 1348 | } |
| 1349 | do { |
| 1350 | sect_len_incr = get_bits(gb, bits); |
| 1351 | sect_end += sect_len_incr; |
| 1352 | if (get_bits_left(gb) < 0) { |
| 1353 | av_log(ac->avctx, AV_LOG_ERROR, "decode_band_types: "overread_err); |
| 1354 | return AVERROR_INVALIDDATA; |
| 1355 | } |
| 1356 | if (sect_end > ics->max_sfb) { |
| 1357 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1358 | "Number of bands (%d) exceeds limit (%d).\n", |
| 1359 | sect_end, ics->max_sfb); |
| 1360 | return AVERROR_INVALIDDATA; |
| 1361 | } |
| 1362 | } while (sect_len_incr == (1 << bits) - 1); |
| 1363 | for (; k < sect_end; k++) { |
| 1364 | band_type [idx] = sect_band_type; |
| 1365 | band_type_run_end[idx++] = sect_end; |
| 1366 | } |
| 1367 | } |
| 1368 | } |
| 1369 | return 0; |
| 1370 | } |
| 1371 | |
| 1372 | /** |
| 1373 | * Decode scalefactors; reference: table 4.47. |
| 1374 | * |
| 1375 | * @param global_gain first scalefactor value as scalefactors are differentially coded |
| 1376 | * @param band_type array of the used band type |
| 1377 | * @param band_type_run_end array of the last scalefactor band of a band type run |
| 1378 | * @param sf array of scalefactors or intensity stereo positions |
| 1379 | * |
| 1380 | * @return Returns error status. 0 - OK, !0 - error |
| 1381 | */ |
| 1382 | static int decode_scalefactors(AACContext *ac, float sf[120], GetBitContext *gb, |
| 1383 | unsigned int global_gain, |
| 1384 | IndividualChannelStream *ics, |
| 1385 | enum BandType band_type[120], |
| 1386 | int band_type_run_end[120]) |
| 1387 | { |
| 1388 | int g, i, idx = 0; |
| 1389 | int offset[3] = { global_gain, global_gain - 90, 0 }; |
| 1390 | int clipped_offset; |
| 1391 | int noise_flag = 1; |
| 1392 | for (g = 0; g < ics->num_window_groups; g++) { |
| 1393 | for (i = 0; i < ics->max_sfb;) { |
| 1394 | int run_end = band_type_run_end[idx]; |
| 1395 | if (band_type[idx] == ZERO_BT) { |
| 1396 | for (; i < run_end; i++, idx++) |
| 1397 | sf[idx] = 0.0; |
| 1398 | } else if ((band_type[idx] == INTENSITY_BT) || |
| 1399 | (band_type[idx] == INTENSITY_BT2)) { |
| 1400 | for (; i < run_end; i++, idx++) { |
| 1401 | offset[2] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60; |
| 1402 | clipped_offset = av_clip(offset[2], -155, 100); |
| 1403 | if (offset[2] != clipped_offset) { |
| 1404 | avpriv_request_sample(ac->avctx, |
| 1405 | "If you heard an audible artifact, there may be a bug in the decoder. " |
| 1406 | "Clipped intensity stereo position (%d -> %d)", |
| 1407 | offset[2], clipped_offset); |
| 1408 | } |
| 1409 | sf[idx] = ff_aac_pow2sf_tab[-clipped_offset + POW_SF2_ZERO]; |
| 1410 | } |
| 1411 | } else if (band_type[idx] == NOISE_BT) { |
| 1412 | for (; i < run_end; i++, idx++) { |
| 1413 | if (noise_flag-- > 0) |
| 1414 | offset[1] += get_bits(gb, 9) - 256; |
| 1415 | else |
| 1416 | offset[1] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60; |
| 1417 | clipped_offset = av_clip(offset[1], -100, 155); |
| 1418 | if (offset[1] != clipped_offset) { |
| 1419 | avpriv_request_sample(ac->avctx, |
| 1420 | "If you heard an audible artifact, there may be a bug in the decoder. " |
| 1421 | "Clipped noise gain (%d -> %d)", |
| 1422 | offset[1], clipped_offset); |
| 1423 | } |
| 1424 | sf[idx] = -ff_aac_pow2sf_tab[clipped_offset + POW_SF2_ZERO]; |
| 1425 | } |
| 1426 | } else { |
| 1427 | for (; i < run_end; i++, idx++) { |
| 1428 | offset[0] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60; |
| 1429 | if (offset[0] > 255U) { |
| 1430 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1431 | "Scalefactor (%d) out of range.\n", offset[0]); |
| 1432 | return AVERROR_INVALIDDATA; |
| 1433 | } |
| 1434 | sf[idx] = -ff_aac_pow2sf_tab[offset[0] - 100 + POW_SF2_ZERO]; |
| 1435 | } |
| 1436 | } |
| 1437 | } |
| 1438 | } |
| 1439 | return 0; |
| 1440 | } |
| 1441 | |
| 1442 | /** |
| 1443 | * Decode pulse data; reference: table 4.7. |
| 1444 | */ |
| 1445 | static int decode_pulses(Pulse *pulse, GetBitContext *gb, |
| 1446 | const uint16_t *swb_offset, int num_swb) |
| 1447 | { |
| 1448 | int i, pulse_swb; |
| 1449 | pulse->num_pulse = get_bits(gb, 2) + 1; |
| 1450 | pulse_swb = get_bits(gb, 6); |
| 1451 | if (pulse_swb >= num_swb) |
| 1452 | return -1; |
| 1453 | pulse->pos[0] = swb_offset[pulse_swb]; |
| 1454 | pulse->pos[0] += get_bits(gb, 5); |
| 1455 | if (pulse->pos[0] >= swb_offset[num_swb]) |
| 1456 | return -1; |
| 1457 | pulse->amp[0] = get_bits(gb, 4); |
| 1458 | for (i = 1; i < pulse->num_pulse; i++) { |
| 1459 | pulse->pos[i] = get_bits(gb, 5) + pulse->pos[i - 1]; |
| 1460 | if (pulse->pos[i] >= swb_offset[num_swb]) |
| 1461 | return -1; |
| 1462 | pulse->amp[i] = get_bits(gb, 4); |
| 1463 | } |
| 1464 | return 0; |
| 1465 | } |
| 1466 | |
| 1467 | /** |
| 1468 | * Decode Temporal Noise Shaping data; reference: table 4.48. |
| 1469 | * |
| 1470 | * @return Returns error status. 0 - OK, !0 - error |
| 1471 | */ |
| 1472 | static int decode_tns(AACContext *ac, TemporalNoiseShaping *tns, |
| 1473 | GetBitContext *gb, const IndividualChannelStream *ics) |
| 1474 | { |
| 1475 | int w, filt, i, coef_len, coef_res, coef_compress; |
| 1476 | const int is8 = ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE; |
| 1477 | const int tns_max_order = is8 ? 7 : ac->oc[1].m4ac.object_type == AOT_AAC_MAIN ? 20 : 12; |
| 1478 | for (w = 0; w < ics->num_windows; w++) { |
| 1479 | if ((tns->n_filt[w] = get_bits(gb, 2 - is8))) { |
| 1480 | coef_res = get_bits1(gb); |
| 1481 | |
| 1482 | for (filt = 0; filt < tns->n_filt[w]; filt++) { |
| 1483 | int tmp2_idx; |
| 1484 | tns->length[w][filt] = get_bits(gb, 6 - 2 * is8); |
| 1485 | |
| 1486 | if ((tns->order[w][filt] = get_bits(gb, 5 - 2 * is8)) > tns_max_order) { |
| 1487 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1488 | "TNS filter order %d is greater than maximum %d.\n", |
| 1489 | tns->order[w][filt], tns_max_order); |
| 1490 | tns->order[w][filt] = 0; |
| 1491 | return AVERROR_INVALIDDATA; |
| 1492 | } |
| 1493 | if (tns->order[w][filt]) { |
| 1494 | tns->direction[w][filt] = get_bits1(gb); |
| 1495 | coef_compress = get_bits1(gb); |
| 1496 | coef_len = coef_res + 3 - coef_compress; |
| 1497 | tmp2_idx = 2 * coef_compress + coef_res; |
| 1498 | |
| 1499 | for (i = 0; i < tns->order[w][filt]; i++) |
| 1500 | tns->coef[w][filt][i] = tns_tmp2_map[tmp2_idx][get_bits(gb, coef_len)]; |
| 1501 | } |
| 1502 | } |
| 1503 | } |
| 1504 | } |
| 1505 | return 0; |
| 1506 | } |
| 1507 | |
| 1508 | /** |
| 1509 | * Decode Mid/Side data; reference: table 4.54. |
| 1510 | * |
| 1511 | * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s; |
| 1512 | * [1] mask is decoded from bitstream; [2] mask is all 1s; |
| 1513 | * [3] reserved for scalable AAC |
| 1514 | */ |
| 1515 | static void decode_mid_side_stereo(ChannelElement *cpe, GetBitContext *gb, |
| 1516 | int ms_present) |
| 1517 | { |
| 1518 | int idx; |
| 1519 | int max_idx = cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb; |
| 1520 | if (ms_present == 1) { |
| 1521 | for (idx = 0; idx < max_idx; idx++) |
| 1522 | cpe->ms_mask[idx] = get_bits1(gb); |
| 1523 | } else if (ms_present == 2) { |
| 1524 | memset(cpe->ms_mask, 1, max_idx * sizeof(cpe->ms_mask[0])); |
| 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | #ifndef VMUL2 |
| 1529 | static inline float *VMUL2(float *dst, const float *v, unsigned idx, |
| 1530 | const float *scale) |
| 1531 | { |
| 1532 | float s = *scale; |
| 1533 | *dst++ = v[idx & 15] * s; |
| 1534 | *dst++ = v[idx>>4 & 15] * s; |
| 1535 | return dst; |
| 1536 | } |
| 1537 | #endif |
| 1538 | |
| 1539 | #ifndef VMUL4 |
| 1540 | static inline float *VMUL4(float *dst, const float *v, unsigned idx, |
| 1541 | const float *scale) |
| 1542 | { |
| 1543 | float s = *scale; |
| 1544 | *dst++ = v[idx & 3] * s; |
| 1545 | *dst++ = v[idx>>2 & 3] * s; |
| 1546 | *dst++ = v[idx>>4 & 3] * s; |
| 1547 | *dst++ = v[idx>>6 & 3] * s; |
| 1548 | return dst; |
| 1549 | } |
| 1550 | #endif |
| 1551 | |
| 1552 | #ifndef VMUL2S |
| 1553 | static inline float *VMUL2S(float *dst, const float *v, unsigned idx, |
| 1554 | unsigned sign, const float *scale) |
| 1555 | { |
| 1556 | union av_intfloat32 s0, s1; |
| 1557 | |
| 1558 | s0.f = s1.f = *scale; |
| 1559 | s0.i ^= sign >> 1 << 31; |
| 1560 | s1.i ^= sign << 31; |
| 1561 | |
| 1562 | *dst++ = v[idx & 15] * s0.f; |
| 1563 | *dst++ = v[idx>>4 & 15] * s1.f; |
| 1564 | |
| 1565 | return dst; |
| 1566 | } |
| 1567 | #endif |
| 1568 | |
| 1569 | #ifndef VMUL4S |
| 1570 | static inline float *VMUL4S(float *dst, const float *v, unsigned idx, |
| 1571 | unsigned sign, const float *scale) |
| 1572 | { |
| 1573 | unsigned nz = idx >> 12; |
| 1574 | union av_intfloat32 s = { .f = *scale }; |
| 1575 | union av_intfloat32 t; |
| 1576 | |
| 1577 | t.i = s.i ^ (sign & 1U<<31); |
| 1578 | *dst++ = v[idx & 3] * t.f; |
| 1579 | |
| 1580 | sign <<= nz & 1; nz >>= 1; |
| 1581 | t.i = s.i ^ (sign & 1U<<31); |
| 1582 | *dst++ = v[idx>>2 & 3] * t.f; |
| 1583 | |
| 1584 | sign <<= nz & 1; nz >>= 1; |
| 1585 | t.i = s.i ^ (sign & 1U<<31); |
| 1586 | *dst++ = v[idx>>4 & 3] * t.f; |
| 1587 | |
| 1588 | sign <<= nz & 1; |
| 1589 | t.i = s.i ^ (sign & 1U<<31); |
| 1590 | *dst++ = v[idx>>6 & 3] * t.f; |
| 1591 | |
| 1592 | return dst; |
| 1593 | } |
| 1594 | #endif |
| 1595 | |
| 1596 | /** |
| 1597 | * Decode spectral data; reference: table 4.50. |
| 1598 | * Dequantize and scale spectral data; reference: 4.6.3.3. |
| 1599 | * |
| 1600 | * @param coef array of dequantized, scaled spectral data |
| 1601 | * @param sf array of scalefactors or intensity stereo positions |
| 1602 | * @param pulse_present set if pulses are present |
| 1603 | * @param pulse pointer to pulse data struct |
| 1604 | * @param band_type array of the used band type |
| 1605 | * |
| 1606 | * @return Returns error status. 0 - OK, !0 - error |
| 1607 | */ |
| 1608 | static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024], |
| 1609 | GetBitContext *gb, const float sf[120], |
| 1610 | int pulse_present, const Pulse *pulse, |
| 1611 | const IndividualChannelStream *ics, |
| 1612 | enum BandType band_type[120]) |
| 1613 | { |
| 1614 | int i, k, g, idx = 0; |
| 1615 | const int c = 1024 / ics->num_windows; |
| 1616 | const uint16_t *offsets = ics->swb_offset; |
| 1617 | float *coef_base = coef; |
| 1618 | |
| 1619 | for (g = 0; g < ics->num_windows; g++) |
| 1620 | memset(coef + g * 128 + offsets[ics->max_sfb], 0, |
| 1621 | sizeof(float) * (c - offsets[ics->max_sfb])); |
| 1622 | |
| 1623 | for (g = 0; g < ics->num_window_groups; g++) { |
| 1624 | unsigned g_len = ics->group_len[g]; |
| 1625 | |
| 1626 | for (i = 0; i < ics->max_sfb; i++, idx++) { |
| 1627 | const unsigned cbt_m1 = band_type[idx] - 1; |
| 1628 | float *cfo = coef + offsets[i]; |
| 1629 | int off_len = offsets[i + 1] - offsets[i]; |
| 1630 | int group; |
| 1631 | |
| 1632 | if (cbt_m1 >= INTENSITY_BT2 - 1) { |
| 1633 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1634 | memset(cfo, 0, off_len * sizeof(float)); |
| 1635 | } |
| 1636 | } else if (cbt_m1 == NOISE_BT - 1) { |
| 1637 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1638 | float scale; |
| 1639 | float band_energy; |
| 1640 | |
| 1641 | for (k = 0; k < off_len; k++) { |
| 1642 | ac->random_state = lcg_random(ac->random_state); |
| 1643 | cfo[k] = ac->random_state; |
| 1644 | } |
| 1645 | |
| 1646 | band_energy = ac->fdsp->scalarproduct_float(cfo, cfo, off_len); |
| 1647 | scale = sf[idx] / sqrtf(band_energy); |
| 1648 | ac->fdsp->vector_fmul_scalar(cfo, cfo, scale, off_len); |
| 1649 | } |
| 1650 | } else { |
| 1651 | const float *vq = ff_aac_codebook_vector_vals[cbt_m1]; |
| 1652 | const uint16_t *cb_vector_idx = ff_aac_codebook_vector_idx[cbt_m1]; |
| 1653 | VLC_TYPE (*vlc_tab)[2] = vlc_spectral[cbt_m1].table; |
| 1654 | OPEN_READER(re, gb); |
| 1655 | |
| 1656 | switch (cbt_m1 >> 1) { |
| 1657 | case 0: |
| 1658 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1659 | float *cf = cfo; |
| 1660 | int len = off_len; |
| 1661 | |
| 1662 | do { |
| 1663 | int code; |
| 1664 | unsigned cb_idx; |
| 1665 | |
| 1666 | UPDATE_CACHE(re, gb); |
| 1667 | GET_VLC(code, re, gb, vlc_tab, 8, 2); |
| 1668 | cb_idx = cb_vector_idx[code]; |
| 1669 | cf = VMUL4(cf, vq, cb_idx, sf + idx); |
| 1670 | } while (len -= 4); |
| 1671 | } |
| 1672 | break; |
| 1673 | |
| 1674 | case 1: |
| 1675 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1676 | float *cf = cfo; |
| 1677 | int len = off_len; |
| 1678 | |
| 1679 | do { |
| 1680 | int code; |
| 1681 | unsigned nnz; |
| 1682 | unsigned cb_idx; |
| 1683 | uint32_t bits; |
| 1684 | |
| 1685 | UPDATE_CACHE(re, gb); |
| 1686 | GET_VLC(code, re, gb, vlc_tab, 8, 2); |
| 1687 | cb_idx = cb_vector_idx[code]; |
| 1688 | nnz = cb_idx >> 8 & 15; |
| 1689 | bits = nnz ? GET_CACHE(re, gb) : 0; |
| 1690 | LAST_SKIP_BITS(re, gb, nnz); |
| 1691 | cf = VMUL4S(cf, vq, cb_idx, bits, sf + idx); |
| 1692 | } while (len -= 4); |
| 1693 | } |
| 1694 | break; |
| 1695 | |
| 1696 | case 2: |
| 1697 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1698 | float *cf = cfo; |
| 1699 | int len = off_len; |
| 1700 | |
| 1701 | do { |
| 1702 | int code; |
| 1703 | unsigned cb_idx; |
| 1704 | |
| 1705 | UPDATE_CACHE(re, gb); |
| 1706 | GET_VLC(code, re, gb, vlc_tab, 8, 2); |
| 1707 | cb_idx = cb_vector_idx[code]; |
| 1708 | cf = VMUL2(cf, vq, cb_idx, sf + idx); |
| 1709 | } while (len -= 2); |
| 1710 | } |
| 1711 | break; |
| 1712 | |
| 1713 | case 3: |
| 1714 | case 4: |
| 1715 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1716 | float *cf = cfo; |
| 1717 | int len = off_len; |
| 1718 | |
| 1719 | do { |
| 1720 | int code; |
| 1721 | unsigned nnz; |
| 1722 | unsigned cb_idx; |
| 1723 | unsigned sign; |
| 1724 | |
| 1725 | UPDATE_CACHE(re, gb); |
| 1726 | GET_VLC(code, re, gb, vlc_tab, 8, 2); |
| 1727 | cb_idx = cb_vector_idx[code]; |
| 1728 | nnz = cb_idx >> 8 & 15; |
| 1729 | sign = nnz ? SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12) : 0; |
| 1730 | LAST_SKIP_BITS(re, gb, nnz); |
| 1731 | cf = VMUL2S(cf, vq, cb_idx, sign, sf + idx); |
| 1732 | } while (len -= 2); |
| 1733 | } |
| 1734 | break; |
| 1735 | |
| 1736 | default: |
| 1737 | for (group = 0; group < g_len; group++, cfo+=128) { |
| 1738 | float *cf = cfo; |
| 1739 | uint32_t *icf = (uint32_t *) cf; |
| 1740 | int len = off_len; |
| 1741 | |
| 1742 | do { |
| 1743 | int code; |
| 1744 | unsigned nzt, nnz; |
| 1745 | unsigned cb_idx; |
| 1746 | uint32_t bits; |
| 1747 | int j; |
| 1748 | |
| 1749 | UPDATE_CACHE(re, gb); |
| 1750 | GET_VLC(code, re, gb, vlc_tab, 8, 2); |
| 1751 | |
| 1752 | if (!code) { |
| 1753 | *icf++ = 0; |
| 1754 | *icf++ = 0; |
| 1755 | continue; |
| 1756 | } |
| 1757 | |
| 1758 | cb_idx = cb_vector_idx[code]; |
| 1759 | nnz = cb_idx >> 12; |
| 1760 | nzt = cb_idx >> 8; |
| 1761 | bits = SHOW_UBITS(re, gb, nnz) << (32-nnz); |
| 1762 | LAST_SKIP_BITS(re, gb, nnz); |
| 1763 | |
| 1764 | for (j = 0; j < 2; j++) { |
| 1765 | if (nzt & 1<<j) { |
| 1766 | uint32_t b; |
| 1767 | int n; |
| 1768 | /* The total length of escape_sequence must be < 22 bits according |
| 1769 | to the specification (i.e. max is 111111110xxxxxxxxxxxx). */ |
| 1770 | UPDATE_CACHE(re, gb); |
| 1771 | b = GET_CACHE(re, gb); |
| 1772 | b = 31 - av_log2(~b); |
| 1773 | |
| 1774 | if (b > 8) { |
| 1775 | av_log(ac->avctx, AV_LOG_ERROR, "error in spectral data, ESC overflow\n"); |
| 1776 | return AVERROR_INVALIDDATA; |
| 1777 | } |
| 1778 | |
| 1779 | SKIP_BITS(re, gb, b + 1); |
| 1780 | b += 4; |
| 1781 | n = (1 << b) + SHOW_UBITS(re, gb, b); |
| 1782 | LAST_SKIP_BITS(re, gb, b); |
| 1783 | *icf++ = cbrt_tab[n] | (bits & 1U<<31); |
| 1784 | bits <<= 1; |
| 1785 | } else { |
| 1786 | unsigned v = ((const uint32_t*)vq)[cb_idx & 15]; |
| 1787 | *icf++ = (bits & 1U<<31) | v; |
| 1788 | bits <<= !!v; |
| 1789 | } |
| 1790 | cb_idx >>= 4; |
| 1791 | } |
| 1792 | } while (len -= 2); |
| 1793 | |
| 1794 | ac->fdsp->vector_fmul_scalar(cfo, cfo, sf[idx], off_len); |
| 1795 | } |
| 1796 | } |
| 1797 | |
| 1798 | CLOSE_READER(re, gb); |
| 1799 | } |
| 1800 | } |
| 1801 | coef += g_len << 7; |
| 1802 | } |
| 1803 | |
| 1804 | if (pulse_present) { |
| 1805 | idx = 0; |
| 1806 | for (i = 0; i < pulse->num_pulse; i++) { |
| 1807 | float co = coef_base[ pulse->pos[i] ]; |
| 1808 | while (offsets[idx + 1] <= pulse->pos[i]) |
| 1809 | idx++; |
| 1810 | if (band_type[idx] != NOISE_BT && sf[idx]) { |
| 1811 | float ico = -pulse->amp[i]; |
| 1812 | if (co) { |
| 1813 | co /= sf[idx]; |
| 1814 | ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico); |
| 1815 | } |
| 1816 | coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx]; |
| 1817 | } |
| 1818 | } |
| 1819 | } |
| 1820 | return 0; |
| 1821 | } |
| 1822 | |
| 1823 | static av_always_inline float flt16_round(float pf) |
| 1824 | { |
| 1825 | union av_intfloat32 tmp; |
| 1826 | tmp.f = pf; |
| 1827 | tmp.i = (tmp.i + 0x00008000U) & 0xFFFF0000U; |
| 1828 | return tmp.f; |
| 1829 | } |
| 1830 | |
| 1831 | static av_always_inline float flt16_even(float pf) |
| 1832 | { |
| 1833 | union av_intfloat32 tmp; |
| 1834 | tmp.f = pf; |
| 1835 | tmp.i = (tmp.i + 0x00007FFFU + (tmp.i & 0x00010000U >> 16)) & 0xFFFF0000U; |
| 1836 | return tmp.f; |
| 1837 | } |
| 1838 | |
| 1839 | static av_always_inline float flt16_trunc(float pf) |
| 1840 | { |
| 1841 | union av_intfloat32 pun; |
| 1842 | pun.f = pf; |
| 1843 | pun.i &= 0xFFFF0000U; |
| 1844 | return pun.f; |
| 1845 | } |
| 1846 | |
| 1847 | static av_always_inline void predict(PredictorState *ps, float *coef, |
| 1848 | int output_enable) |
| 1849 | { |
| 1850 | const float a = 0.953125; // 61.0 / 64 |
| 1851 | const float alpha = 0.90625; // 29.0 / 32 |
| 1852 | float e0, e1; |
| 1853 | float pv; |
| 1854 | float k1, k2; |
| 1855 | float r0 = ps->r0, r1 = ps->r1; |
| 1856 | float cor0 = ps->cor0, cor1 = ps->cor1; |
| 1857 | float var0 = ps->var0, var1 = ps->var1; |
| 1858 | |
| 1859 | k1 = var0 > 1 ? cor0 * flt16_even(a / var0) : 0; |
| 1860 | k2 = var1 > 1 ? cor1 * flt16_even(a / var1) : 0; |
| 1861 | |
| 1862 | pv = flt16_round(k1 * r0 + k2 * r1); |
| 1863 | if (output_enable) |
| 1864 | *coef += pv; |
| 1865 | |
| 1866 | e0 = *coef; |
| 1867 | e1 = e0 - k1 * r0; |
| 1868 | |
| 1869 | ps->cor1 = flt16_trunc(alpha * cor1 + r1 * e1); |
| 1870 | ps->var1 = flt16_trunc(alpha * var1 + 0.5f * (r1 * r1 + e1 * e1)); |
| 1871 | ps->cor0 = flt16_trunc(alpha * cor0 + r0 * e0); |
| 1872 | ps->var0 = flt16_trunc(alpha * var0 + 0.5f * (r0 * r0 + e0 * e0)); |
| 1873 | |
| 1874 | ps->r1 = flt16_trunc(a * (r0 - k1 * e0)); |
| 1875 | ps->r0 = flt16_trunc(a * e0); |
| 1876 | } |
| 1877 | |
| 1878 | /** |
| 1879 | * Apply AAC-Main style frequency domain prediction. |
| 1880 | */ |
| 1881 | static void apply_prediction(AACContext *ac, SingleChannelElement *sce) |
| 1882 | { |
| 1883 | int sfb, k; |
| 1884 | |
| 1885 | if (!sce->ics.predictor_initialized) { |
| 1886 | reset_all_predictors(sce->predictor_state); |
| 1887 | sce->ics.predictor_initialized = 1; |
| 1888 | } |
| 1889 | |
| 1890 | if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) { |
| 1891 | for (sfb = 0; |
| 1892 | sfb < ff_aac_pred_sfb_max[ac->oc[1].m4ac.sampling_index]; |
| 1893 | sfb++) { |
| 1894 | for (k = sce->ics.swb_offset[sfb]; |
| 1895 | k < sce->ics.swb_offset[sfb + 1]; |
| 1896 | k++) { |
| 1897 | predict(&sce->predictor_state[k], &sce->coeffs[k], |
| 1898 | sce->ics.predictor_present && |
| 1899 | sce->ics.prediction_used[sfb]); |
| 1900 | } |
| 1901 | } |
| 1902 | if (sce->ics.predictor_reset_group) |
| 1903 | reset_predictor_group(sce->predictor_state, |
| 1904 | sce->ics.predictor_reset_group); |
| 1905 | } else |
| 1906 | reset_all_predictors(sce->predictor_state); |
| 1907 | } |
| 1908 | |
| 1909 | /** |
| 1910 | * Decode an individual_channel_stream payload; reference: table 4.44. |
| 1911 | * |
| 1912 | * @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information. |
| 1913 | * @param scale_flag scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.) |
| 1914 | * |
| 1915 | * @return Returns error status. 0 - OK, !0 - error |
| 1916 | */ |
| 1917 | static int decode_ics(AACContext *ac, SingleChannelElement *sce, |
| 1918 | GetBitContext *gb, int common_window, int scale_flag) |
| 1919 | { |
| 1920 | Pulse pulse; |
| 1921 | TemporalNoiseShaping *tns = &sce->tns; |
| 1922 | IndividualChannelStream *ics = &sce->ics; |
| 1923 | float *out = sce->coeffs; |
| 1924 | int global_gain, eld_syntax, er_syntax, pulse_present = 0; |
| 1925 | int ret; |
| 1926 | |
| 1927 | eld_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_ELD; |
| 1928 | er_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_LC || |
| 1929 | ac->oc[1].m4ac.object_type == AOT_ER_AAC_LTP || |
| 1930 | ac->oc[1].m4ac.object_type == AOT_ER_AAC_LD || |
| 1931 | ac->oc[1].m4ac.object_type == AOT_ER_AAC_ELD; |
| 1932 | |
| 1933 | /* This assignment is to silence a GCC warning about the variable being used |
| 1934 | * uninitialized when in fact it always is. |
| 1935 | */ |
| 1936 | pulse.num_pulse = 0; |
| 1937 | |
| 1938 | global_gain = get_bits(gb, 8); |
| 1939 | |
| 1940 | if (!common_window && !scale_flag) { |
| 1941 | if (decode_ics_info(ac, ics, gb) < 0) |
| 1942 | return AVERROR_INVALIDDATA; |
| 1943 | } |
| 1944 | |
| 1945 | if ((ret = decode_band_types(ac, sce->band_type, |
| 1946 | sce->band_type_run_end, gb, ics)) < 0) |
| 1947 | return ret; |
| 1948 | if ((ret = decode_scalefactors(ac, sce->sf, gb, global_gain, ics, |
| 1949 | sce->band_type, sce->band_type_run_end)) < 0) |
| 1950 | return ret; |
| 1951 | |
| 1952 | pulse_present = 0; |
| 1953 | if (!scale_flag) { |
| 1954 | if (!eld_syntax && (pulse_present = get_bits1(gb))) { |
| 1955 | if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { |
| 1956 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1957 | "Pulse tool not allowed in eight short sequence.\n"); |
| 1958 | return AVERROR_INVALIDDATA; |
| 1959 | } |
| 1960 | if (decode_pulses(&pulse, gb, ics->swb_offset, ics->num_swb)) { |
| 1961 | av_log(ac->avctx, AV_LOG_ERROR, |
| 1962 | "Pulse data corrupt or invalid.\n"); |
| 1963 | return AVERROR_INVALIDDATA; |
| 1964 | } |
| 1965 | } |
| 1966 | tns->present = get_bits1(gb); |
| 1967 | if (tns->present && !er_syntax) |
| 1968 | if (decode_tns(ac, tns, gb, ics) < 0) |
| 1969 | return AVERROR_INVALIDDATA; |
| 1970 | if (!eld_syntax && get_bits1(gb)) { |
| 1971 | avpriv_request_sample(ac->avctx, "SSR"); |
| 1972 | return AVERROR_PATCHWELCOME; |
| 1973 | } |
| 1974 | // I see no textual basis in the spec for this occurring after SSR gain |
| 1975 | // control, but this is what both reference and real implmentations do |
| 1976 | if (tns->present && er_syntax) |
| 1977 | if (decode_tns(ac, tns, gb, ics) < 0) |
| 1978 | return AVERROR_INVALIDDATA; |
| 1979 | } |
| 1980 | |
| 1981 | if (decode_spectrum_and_dequant(ac, out, gb, sce->sf, pulse_present, |
| 1982 | &pulse, ics, sce->band_type) < 0) |
| 1983 | return AVERROR_INVALIDDATA; |
| 1984 | |
| 1985 | if (ac->oc[1].m4ac.object_type == AOT_AAC_MAIN && !common_window) |
| 1986 | apply_prediction(ac, sce); |
| 1987 | |
| 1988 | return 0; |
| 1989 | } |
| 1990 | |
| 1991 | /** |
| 1992 | * Mid/Side stereo decoding; reference: 4.6.8.1.3. |
| 1993 | */ |
| 1994 | static void apply_mid_side_stereo(AACContext *ac, ChannelElement *cpe) |
| 1995 | { |
| 1996 | const IndividualChannelStream *ics = &cpe->ch[0].ics; |
| 1997 | float *ch0 = cpe->ch[0].coeffs; |
| 1998 | float *ch1 = cpe->ch[1].coeffs; |
| 1999 | int g, i, group, idx = 0; |
| 2000 | const uint16_t *offsets = ics->swb_offset; |
| 2001 | for (g = 0; g < ics->num_window_groups; g++) { |
| 2002 | for (i = 0; i < ics->max_sfb; i++, idx++) { |
| 2003 | if (cpe->ms_mask[idx] && |
| 2004 | cpe->ch[0].band_type[idx] < NOISE_BT && |
| 2005 | cpe->ch[1].band_type[idx] < NOISE_BT) { |
| 2006 | for (group = 0; group < ics->group_len[g]; group++) { |
| 2007 | ac->fdsp->butterflies_float(ch0 + group * 128 + offsets[i], |
| 2008 | ch1 + group * 128 + offsets[i], |
| 2009 | offsets[i+1] - offsets[i]); |
| 2010 | } |
| 2011 | } |
| 2012 | } |
| 2013 | ch0 += ics->group_len[g] * 128; |
| 2014 | ch1 += ics->group_len[g] * 128; |
| 2015 | } |
| 2016 | } |
| 2017 | |
| 2018 | /** |
| 2019 | * intensity stereo decoding; reference: 4.6.8.2.3 |
| 2020 | * |
| 2021 | * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s; |
| 2022 | * [1] mask is decoded from bitstream; [2] mask is all 1s; |
| 2023 | * [3] reserved for scalable AAC |
| 2024 | */ |
| 2025 | static void apply_intensity_stereo(AACContext *ac, |
| 2026 | ChannelElement *cpe, int ms_present) |
| 2027 | { |
| 2028 | const IndividualChannelStream *ics = &cpe->ch[1].ics; |
| 2029 | SingleChannelElement *sce1 = &cpe->ch[1]; |
| 2030 | float *coef0 = cpe->ch[0].coeffs, *coef1 = cpe->ch[1].coeffs; |
| 2031 | const uint16_t *offsets = ics->swb_offset; |
| 2032 | int g, group, i, idx = 0; |
| 2033 | int c; |
| 2034 | float scale; |
| 2035 | for (g = 0; g < ics->num_window_groups; g++) { |
| 2036 | for (i = 0; i < ics->max_sfb;) { |
| 2037 | if (sce1->band_type[idx] == INTENSITY_BT || |
| 2038 | sce1->band_type[idx] == INTENSITY_BT2) { |
| 2039 | const int bt_run_end = sce1->band_type_run_end[idx]; |
| 2040 | for (; i < bt_run_end; i++, idx++) { |
| 2041 | c = -1 + 2 * (sce1->band_type[idx] - 14); |
| 2042 | if (ms_present) |
| 2043 | c *= 1 - 2 * cpe->ms_mask[idx]; |
| 2044 | scale = c * sce1->sf[idx]; |
| 2045 | for (group = 0; group < ics->group_len[g]; group++) |
| 2046 | ac->fdsp->vector_fmul_scalar(coef1 + group * 128 + offsets[i], |
| 2047 | coef0 + group * 128 + offsets[i], |
| 2048 | scale, |
| 2049 | offsets[i + 1] - offsets[i]); |
| 2050 | } |
| 2051 | } else { |
| 2052 | int bt_run_end = sce1->band_type_run_end[idx]; |
| 2053 | idx += bt_run_end - i; |
| 2054 | i = bt_run_end; |
| 2055 | } |
| 2056 | } |
| 2057 | coef0 += ics->group_len[g] * 128; |
| 2058 | coef1 += ics->group_len[g] * 128; |
| 2059 | } |
| 2060 | } |
| 2061 | |
| 2062 | /** |
| 2063 | * Decode a channel_pair_element; reference: table 4.4. |
| 2064 | * |
| 2065 | * @return Returns error status. 0 - OK, !0 - error |
| 2066 | */ |
| 2067 | static int decode_cpe(AACContext *ac, GetBitContext *gb, ChannelElement *cpe) |
| 2068 | { |
| 2069 | int i, ret, common_window, ms_present = 0; |
| 2070 | int eld_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_ELD; |
| 2071 | |
| 2072 | common_window = eld_syntax || get_bits1(gb); |
| 2073 | if (common_window) { |
| 2074 | if (decode_ics_info(ac, &cpe->ch[0].ics, gb)) |
| 2075 | return AVERROR_INVALIDDATA; |
| 2076 | i = cpe->ch[1].ics.use_kb_window[0]; |
| 2077 | cpe->ch[1].ics = cpe->ch[0].ics; |
| 2078 | cpe->ch[1].ics.use_kb_window[1] = i; |
| 2079 | if (cpe->ch[1].ics.predictor_present && |
| 2080 | (ac->oc[1].m4ac.object_type != AOT_AAC_MAIN)) |
| 2081 | if ((cpe->ch[1].ics.ltp.present = get_bits(gb, 1))) |
| 2082 | decode_ltp(&cpe->ch[1].ics.ltp, gb, cpe->ch[1].ics.max_sfb); |
| 2083 | ms_present = get_bits(gb, 2); |
| 2084 | if (ms_present == 3) { |
| 2085 | av_log(ac->avctx, AV_LOG_ERROR, "ms_present = 3 is reserved.\n"); |
| 2086 | return AVERROR_INVALIDDATA; |
| 2087 | } else if (ms_present) |
| 2088 | decode_mid_side_stereo(cpe, gb, ms_present); |
| 2089 | } |
| 2090 | if ((ret = decode_ics(ac, &cpe->ch[0], gb, common_window, 0))) |
| 2091 | return ret; |
| 2092 | if ((ret = decode_ics(ac, &cpe->ch[1], gb, common_window, 0))) |
| 2093 | return ret; |
| 2094 | |
| 2095 | if (common_window) { |
| 2096 | if (ms_present) |
| 2097 | apply_mid_side_stereo(ac, cpe); |
| 2098 | if (ac->oc[1].m4ac.object_type == AOT_AAC_MAIN) { |
| 2099 | apply_prediction(ac, &cpe->ch[0]); |
| 2100 | apply_prediction(ac, &cpe->ch[1]); |
| 2101 | } |
| 2102 | } |
| 2103 | |
| 2104 | apply_intensity_stereo(ac, cpe, ms_present); |
| 2105 | return 0; |
| 2106 | } |
| 2107 | |
| 2108 | static const float cce_scale[] = { |
| 2109 | 1.09050773266525765921, //2^(1/8) |
| 2110 | 1.18920711500272106672, //2^(1/4) |
| 2111 | M_SQRT2, |
| 2112 | 2, |
| 2113 | }; |
| 2114 | |
| 2115 | /** |
| 2116 | * Decode coupling_channel_element; reference: table 4.8. |
| 2117 | * |
| 2118 | * @return Returns error status. 0 - OK, !0 - error |
| 2119 | */ |
| 2120 | static int decode_cce(AACContext *ac, GetBitContext *gb, ChannelElement *che) |
| 2121 | { |
| 2122 | int num_gain = 0; |
| 2123 | int c, g, sfb, ret; |
| 2124 | int sign; |
| 2125 | float scale; |
| 2126 | SingleChannelElement *sce = &che->ch[0]; |
| 2127 | ChannelCoupling *coup = &che->coup; |
| 2128 | |
| 2129 | coup->coupling_point = 2 * get_bits1(gb); |
| 2130 | coup->num_coupled = get_bits(gb, 3); |
| 2131 | for (c = 0; c <= coup->num_coupled; c++) { |
| 2132 | num_gain++; |
| 2133 | coup->type[c] = get_bits1(gb) ? TYPE_CPE : TYPE_SCE; |
| 2134 | coup->id_select[c] = get_bits(gb, 4); |
| 2135 | if (coup->type[c] == TYPE_CPE) { |
| 2136 | coup->ch_select[c] = get_bits(gb, 2); |
| 2137 | if (coup->ch_select[c] == 3) |
| 2138 | num_gain++; |
| 2139 | } else |
| 2140 | coup->ch_select[c] = 2; |
| 2141 | } |
| 2142 | coup->coupling_point += get_bits1(gb) || (coup->coupling_point >> 1); |
| 2143 | |
| 2144 | sign = get_bits(gb, 1); |
| 2145 | scale = cce_scale[get_bits(gb, 2)]; |
| 2146 | |
| 2147 | if ((ret = decode_ics(ac, sce, gb, 0, 0))) |
| 2148 | return ret; |
| 2149 | |
| 2150 | for (c = 0; c < num_gain; c++) { |
| 2151 | int idx = 0; |
| 2152 | int cge = 1; |
| 2153 | int gain = 0; |
| 2154 | float gain_cache = 1.0; |
| 2155 | if (c) { |
| 2156 | cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb); |
| 2157 | gain = cge ? get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60: 0; |
| 2158 | gain_cache = powf(scale, -gain); |
| 2159 | } |
| 2160 | if (coup->coupling_point == AFTER_IMDCT) { |
| 2161 | coup->gain[c][0] = gain_cache; |
| 2162 | } else { |
| 2163 | for (g = 0; g < sce->ics.num_window_groups; g++) { |
| 2164 | for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) { |
| 2165 | if (sce->band_type[idx] != ZERO_BT) { |
| 2166 | if (!cge) { |
| 2167 | int t = get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60; |
| 2168 | if (t) { |
| 2169 | int s = 1; |
| 2170 | t = gain += t; |
| 2171 | if (sign) { |
| 2172 | s -= 2 * (t & 0x1); |
| 2173 | t >>= 1; |
| 2174 | } |
| 2175 | gain_cache = powf(scale, -t) * s; |
| 2176 | } |
| 2177 | } |
| 2178 | coup->gain[c][idx] = gain_cache; |
| 2179 | } |
| 2180 | } |
| 2181 | } |
| 2182 | } |
| 2183 | } |
| 2184 | return 0; |
| 2185 | } |
| 2186 | |
| 2187 | /** |
| 2188 | * Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53. |
| 2189 | * |
| 2190 | * @return Returns number of bytes consumed. |
| 2191 | */ |
| 2192 | static int decode_drc_channel_exclusions(DynamicRangeControl *che_drc, |
| 2193 | GetBitContext *gb) |
| 2194 | { |
| 2195 | int i; |
| 2196 | int num_excl_chan = 0; |
| 2197 | |
| 2198 | do { |
| 2199 | for (i = 0; i < 7; i++) |
| 2200 | che_drc->exclude_mask[num_excl_chan++] = get_bits1(gb); |
| 2201 | } while (num_excl_chan < MAX_CHANNELS - 7 && get_bits1(gb)); |
| 2202 | |
| 2203 | return num_excl_chan / 7; |
| 2204 | } |
| 2205 | |
| 2206 | /** |
| 2207 | * Decode dynamic range information; reference: table 4.52. |
| 2208 | * |
| 2209 | * @return Returns number of bytes consumed. |
| 2210 | */ |
| 2211 | static int decode_dynamic_range(DynamicRangeControl *che_drc, |
| 2212 | GetBitContext *gb) |
| 2213 | { |
| 2214 | int n = 1; |
| 2215 | int drc_num_bands = 1; |
| 2216 | int i; |
| 2217 | |
| 2218 | /* pce_tag_present? */ |
| 2219 | if (get_bits1(gb)) { |
| 2220 | che_drc->pce_instance_tag = get_bits(gb, 4); |
| 2221 | skip_bits(gb, 4); // tag_reserved_bits |
| 2222 | n++; |
| 2223 | } |
| 2224 | |
| 2225 | /* excluded_chns_present? */ |
| 2226 | if (get_bits1(gb)) { |
| 2227 | n += decode_drc_channel_exclusions(che_drc, gb); |
| 2228 | } |
| 2229 | |
| 2230 | /* drc_bands_present? */ |
| 2231 | if (get_bits1(gb)) { |
| 2232 | che_drc->band_incr = get_bits(gb, 4); |
| 2233 | che_drc->interpolation_scheme = get_bits(gb, 4); |
| 2234 | n++; |
| 2235 | drc_num_bands += che_drc->band_incr; |
| 2236 | for (i = 0; i < drc_num_bands; i++) { |
| 2237 | che_drc->band_top[i] = get_bits(gb, 8); |
| 2238 | n++; |
| 2239 | } |
| 2240 | } |
| 2241 | |
| 2242 | /* prog_ref_level_present? */ |
| 2243 | if (get_bits1(gb)) { |
| 2244 | che_drc->prog_ref_level = get_bits(gb, 7); |
| 2245 | skip_bits1(gb); // prog_ref_level_reserved_bits |
| 2246 | n++; |
| 2247 | } |
| 2248 | |
| 2249 | for (i = 0; i < drc_num_bands; i++) { |
| 2250 | che_drc->dyn_rng_sgn[i] = get_bits1(gb); |
| 2251 | che_drc->dyn_rng_ctl[i] = get_bits(gb, 7); |
| 2252 | n++; |
| 2253 | } |
| 2254 | |
| 2255 | return n; |
| 2256 | } |
| 2257 | |
| 2258 | static int decode_fill(AACContext *ac, GetBitContext *gb, int len) { |
| 2259 | uint8_t buf[256]; |
| 2260 | int i, major, minor; |
| 2261 | |
| 2262 | if (len < 13+7*8) |
| 2263 | goto unknown; |
| 2264 | |
| 2265 | get_bits(gb, 13); len -= 13; |
| 2266 | |
| 2267 | for(i=0; i+1<sizeof(buf) && len>=8; i++, len-=8) |
| 2268 | buf[i] = get_bits(gb, 8); |
| 2269 | |
| 2270 | buf[i] = 0; |
| 2271 | if (ac->avctx->debug & FF_DEBUG_PICT_INFO) |
| 2272 | av_log(ac->avctx, AV_LOG_DEBUG, "FILL:%s\n", buf); |
| 2273 | |
| 2274 | if (sscanf(buf, "libfaac %d.%d", &major, &minor) == 2){ |
| 2275 | ac->avctx->internal->skip_samples = 1024; |
| 2276 | } |
| 2277 | |
| 2278 | unknown: |
| 2279 | skip_bits_long(gb, len); |
| 2280 | |
| 2281 | return 0; |
| 2282 | } |
| 2283 | |
| 2284 | /** |
| 2285 | * Decode extension data (incomplete); reference: table 4.51. |
| 2286 | * |
| 2287 | * @param cnt length of TYPE_FIL syntactic element in bytes |
| 2288 | * |
| 2289 | * @return Returns number of bytes consumed |
| 2290 | */ |
| 2291 | static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt, |
| 2292 | ChannelElement *che, enum RawDataBlockType elem_type) |
| 2293 | { |
| 2294 | int crc_flag = 0; |
| 2295 | int res = cnt; |
| 2296 | int type = get_bits(gb, 4); |
| 2297 | |
| 2298 | if (ac->avctx->debug & FF_DEBUG_STARTCODE) |
| 2299 | av_log(ac->avctx, AV_LOG_DEBUG, "extension type: %d len:%d\n", type, cnt); |
| 2300 | |
| 2301 | switch (type) { // extension type |
| 2302 | case EXT_SBR_DATA_CRC: |
| 2303 | crc_flag++; |
| 2304 | case EXT_SBR_DATA: |
| 2305 | if (!che) { |
| 2306 | av_log(ac->avctx, AV_LOG_ERROR, "SBR was found before the first channel element.\n"); |
| 2307 | return res; |
| 2308 | } else if (!ac->oc[1].m4ac.sbr) { |
| 2309 | av_log(ac->avctx, AV_LOG_ERROR, "SBR signaled to be not-present but was found in the bitstream.\n"); |
| 2310 | skip_bits_long(gb, 8 * cnt - 4); |
| 2311 | return res; |
| 2312 | } else if (ac->oc[1].m4ac.sbr == -1 && ac->oc[1].status == OC_LOCKED) { |
| 2313 | av_log(ac->avctx, AV_LOG_ERROR, "Implicit SBR was found with a first occurrence after the first frame.\n"); |
| 2314 | skip_bits_long(gb, 8 * cnt - 4); |
| 2315 | return res; |
| 2316 | } else if (ac->oc[1].m4ac.ps == -1 && ac->oc[1].status < OC_LOCKED && ac->avctx->channels == 1) { |
| 2317 | ac->oc[1].m4ac.sbr = 1; |
| 2318 | ac->oc[1].m4ac.ps = 1; |
| 2319 | ac->avctx->profile = FF_PROFILE_AAC_HE_V2; |
| 2320 | output_configure(ac, ac->oc[1].layout_map, ac->oc[1].layout_map_tags, |
| 2321 | ac->oc[1].status, 1); |
| 2322 | } else { |
| 2323 | ac->oc[1].m4ac.sbr = 1; |
| 2324 | ac->avctx->profile = FF_PROFILE_AAC_HE; |
| 2325 | } |
| 2326 | res = ff_decode_sbr_extension(ac, &che->sbr, gb, crc_flag, cnt, elem_type); |
| 2327 | break; |
| 2328 | case EXT_DYNAMIC_RANGE: |
| 2329 | res = decode_dynamic_range(&ac->che_drc, gb); |
| 2330 | break; |
| 2331 | case EXT_FILL: |
| 2332 | decode_fill(ac, gb, 8 * cnt - 4); |
| 2333 | break; |
| 2334 | case EXT_FILL_DATA: |
| 2335 | case EXT_DATA_ELEMENT: |
| 2336 | default: |
| 2337 | skip_bits_long(gb, 8 * cnt - 4); |
| 2338 | break; |
| 2339 | }; |
| 2340 | return res; |
| 2341 | } |
| 2342 | |
| 2343 | /** |
| 2344 | * Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3. |
| 2345 | * |
| 2346 | * @param decode 1 if tool is used normally, 0 if tool is used in LTP. |
| 2347 | * @param coef spectral coefficients |
| 2348 | */ |
| 2349 | static void apply_tns(float coef[1024], TemporalNoiseShaping *tns, |
| 2350 | IndividualChannelStream *ics, int decode) |
| 2351 | { |
| 2352 | const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb); |
| 2353 | int w, filt, m, i; |
| 2354 | int bottom, top, order, start, end, size, inc; |
| 2355 | float lpc[TNS_MAX_ORDER]; |
| 2356 | float tmp[TNS_MAX_ORDER+1]; |
| 2357 | |
| 2358 | for (w = 0; w < ics->num_windows; w++) { |
| 2359 | bottom = ics->num_swb; |
| 2360 | for (filt = 0; filt < tns->n_filt[w]; filt++) { |
| 2361 | top = bottom; |
| 2362 | bottom = FFMAX(0, top - tns->length[w][filt]); |
| 2363 | order = tns->order[w][filt]; |
| 2364 | if (order == 0) |
| 2365 | continue; |
| 2366 | |
| 2367 | // tns_decode_coef |
| 2368 | compute_lpc_coefs(tns->coef[w][filt], order, lpc, 0, 0, 0); |
| 2369 | |
| 2370 | start = ics->swb_offset[FFMIN(bottom, mmm)]; |
| 2371 | end = ics->swb_offset[FFMIN( top, mmm)]; |
| 2372 | if ((size = end - start) <= 0) |
| 2373 | continue; |
| 2374 | if (tns->direction[w][filt]) { |
| 2375 | inc = -1; |
| 2376 | start = end - 1; |
| 2377 | } else { |
| 2378 | inc = 1; |
| 2379 | } |
| 2380 | start += w * 128; |
| 2381 | |
| 2382 | if (decode) { |
| 2383 | // ar filter |
| 2384 | for (m = 0; m < size; m++, start += inc) |
| 2385 | for (i = 1; i <= FFMIN(m, order); i++) |
| 2386 | coef[start] -= coef[start - i * inc] * lpc[i - 1]; |
| 2387 | } else { |
| 2388 | // ma filter |
| 2389 | for (m = 0; m < size; m++, start += inc) { |
| 2390 | tmp[0] = coef[start]; |
| 2391 | for (i = 1; i <= FFMIN(m, order); i++) |
| 2392 | coef[start] += tmp[i] * lpc[i - 1]; |
| 2393 | for (i = order; i > 0; i--) |
| 2394 | tmp[i] = tmp[i - 1]; |
| 2395 | } |
| 2396 | } |
| 2397 | } |
| 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | /** |
| 2402 | * Apply windowing and MDCT to obtain the spectral |
| 2403 | * coefficient from the predicted sample by LTP. |
| 2404 | */ |
| 2405 | static void windowing_and_mdct_ltp(AACContext *ac, float *out, |
| 2406 | float *in, IndividualChannelStream *ics) |
| 2407 | { |
| 2408 | const float *lwindow = ics->use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024; |
| 2409 | const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128; |
| 2410 | const float *lwindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024; |
| 2411 | const float *swindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128; |
| 2412 | |
| 2413 | if (ics->window_sequence[0] != LONG_STOP_SEQUENCE) { |
| 2414 | ac->fdsp->vector_fmul(in, in, lwindow_prev, 1024); |
| 2415 | } else { |
| 2416 | memset(in, 0, 448 * sizeof(float)); |
| 2417 | ac->fdsp->vector_fmul(in + 448, in + 448, swindow_prev, 128); |
| 2418 | } |
| 2419 | if (ics->window_sequence[0] != LONG_START_SEQUENCE) { |
| 2420 | ac->fdsp->vector_fmul_reverse(in + 1024, in + 1024, lwindow, 1024); |
| 2421 | } else { |
| 2422 | ac->fdsp->vector_fmul_reverse(in + 1024 + 448, in + 1024 + 448, swindow, 128); |
| 2423 | memset(in + 1024 + 576, 0, 448 * sizeof(float)); |
| 2424 | } |
| 2425 | ac->mdct_ltp.mdct_calc(&ac->mdct_ltp, out, in); |
| 2426 | } |
| 2427 | |
| 2428 | /** |
| 2429 | * Apply the long term prediction |
| 2430 | */ |
| 2431 | static void apply_ltp(AACContext *ac, SingleChannelElement *sce) |
| 2432 | { |
| 2433 | const LongTermPrediction *ltp = &sce->ics.ltp; |
| 2434 | const uint16_t *offsets = sce->ics.swb_offset; |
| 2435 | int i, sfb; |
| 2436 | |
| 2437 | if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) { |
| 2438 | float *predTime = sce->ret; |
| 2439 | float *predFreq = ac->buf_mdct; |
| 2440 | int16_t num_samples = 2048; |
| 2441 | |
| 2442 | if (ltp->lag < 1024) |
| 2443 | num_samples = ltp->lag + 1024; |
| 2444 | for (i = 0; i < num_samples; i++) |
| 2445 | predTime[i] = sce->ltp_state[i + 2048 - ltp->lag] * ltp->coef; |
| 2446 | memset(&predTime[i], 0, (2048 - i) * sizeof(float)); |
| 2447 | |
| 2448 | ac->windowing_and_mdct_ltp(ac, predFreq, predTime, &sce->ics); |
| 2449 | |
| 2450 | if (sce->tns.present) |
| 2451 | ac->apply_tns(predFreq, &sce->tns, &sce->ics, 0); |
| 2452 | |
| 2453 | for (sfb = 0; sfb < FFMIN(sce->ics.max_sfb, MAX_LTP_LONG_SFB); sfb++) |
| 2454 | if (ltp->used[sfb]) |
| 2455 | for (i = offsets[sfb]; i < offsets[sfb + 1]; i++) |
| 2456 | sce->coeffs[i] += predFreq[i]; |
| 2457 | } |
| 2458 | } |
| 2459 | |
| 2460 | /** |
| 2461 | * Update the LTP buffer for next frame |
| 2462 | */ |
| 2463 | static void update_ltp(AACContext *ac, SingleChannelElement *sce) |
| 2464 | { |
| 2465 | IndividualChannelStream *ics = &sce->ics; |
| 2466 | float *saved = sce->saved; |
| 2467 | float *saved_ltp = sce->coeffs; |
| 2468 | const float *lwindow = ics->use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024; |
| 2469 | const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128; |
| 2470 | int i; |
| 2471 | |
| 2472 | if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { |
| 2473 | memcpy(saved_ltp, saved, 512 * sizeof(float)); |
| 2474 | memset(saved_ltp + 576, 0, 448 * sizeof(float)); |
| 2475 | ac->fdsp->vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64); |
| 2476 | for (i = 0; i < 64; i++) |
| 2477 | saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * swindow[63 - i]; |
| 2478 | } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) { |
| 2479 | memcpy(saved_ltp, ac->buf_mdct + 512, 448 * sizeof(float)); |
| 2480 | memset(saved_ltp + 576, 0, 448 * sizeof(float)); |
| 2481 | ac->fdsp->vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64); |
| 2482 | for (i = 0; i < 64; i++) |
| 2483 | saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * swindow[63 - i]; |
| 2484 | } else { // LONG_STOP or ONLY_LONG |
| 2485 | ac->fdsp->vector_fmul_reverse(saved_ltp, ac->buf_mdct + 512, &lwindow[512], 512); |
| 2486 | for (i = 0; i < 512; i++) |
| 2487 | saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * lwindow[511 - i]; |
| 2488 | } |
| 2489 | |
| 2490 | memcpy(sce->ltp_state, sce->ltp_state+1024, 1024 * sizeof(*sce->ltp_state)); |
| 2491 | memcpy(sce->ltp_state+1024, sce->ret, 1024 * sizeof(*sce->ltp_state)); |
| 2492 | memcpy(sce->ltp_state+2048, saved_ltp, 1024 * sizeof(*sce->ltp_state)); |
| 2493 | } |
| 2494 | |
| 2495 | /** |
| 2496 | * Conduct IMDCT and windowing. |
| 2497 | */ |
| 2498 | static void imdct_and_windowing(AACContext *ac, SingleChannelElement *sce) |
| 2499 | { |
| 2500 | IndividualChannelStream *ics = &sce->ics; |
| 2501 | float *in = sce->coeffs; |
| 2502 | float *out = sce->ret; |
| 2503 | float *saved = sce->saved; |
| 2504 | const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128; |
| 2505 | const float *lwindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024; |
| 2506 | const float *swindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128; |
| 2507 | float *buf = ac->buf_mdct; |
| 2508 | float *temp = ac->temp; |
| 2509 | int i; |
| 2510 | |
| 2511 | // imdct |
| 2512 | if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { |
| 2513 | for (i = 0; i < 1024; i += 128) |
| 2514 | ac->mdct_small.imdct_half(&ac->mdct_small, buf + i, in + i); |
| 2515 | } else |
| 2516 | ac->mdct.imdct_half(&ac->mdct, buf, in); |
| 2517 | |
| 2518 | /* window overlapping |
| 2519 | * NOTE: To simplify the overlapping code, all 'meaningless' short to long |
| 2520 | * and long to short transitions are considered to be short to short |
| 2521 | * transitions. This leaves just two cases (long to long and short to short) |
| 2522 | * with a little special sauce for EIGHT_SHORT_SEQUENCE. |
| 2523 | */ |
| 2524 | if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) && |
| 2525 | (ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) { |
| 2526 | ac->fdsp->vector_fmul_window( out, saved, buf, lwindow_prev, 512); |
| 2527 | } else { |
| 2528 | memcpy( out, saved, 448 * sizeof(float)); |
| 2529 | |
| 2530 | if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { |
| 2531 | ac->fdsp->vector_fmul_window(out + 448 + 0*128, saved + 448, buf + 0*128, swindow_prev, 64); |
| 2532 | ac->fdsp->vector_fmul_window(out + 448 + 1*128, buf + 0*128 + 64, buf + 1*128, swindow, 64); |
| 2533 | ac->fdsp->vector_fmul_window(out + 448 + 2*128, buf + 1*128 + 64, buf + 2*128, swindow, 64); |
| 2534 | ac->fdsp->vector_fmul_window(out + 448 + 3*128, buf + 2*128 + 64, buf + 3*128, swindow, 64); |
| 2535 | ac->fdsp->vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, swindow, 64); |
| 2536 | memcpy( out + 448 + 4*128, temp, 64 * sizeof(float)); |
| 2537 | } else { |
| 2538 | ac->fdsp->vector_fmul_window(out + 448, saved + 448, buf, swindow_prev, 64); |
| 2539 | memcpy( out + 576, buf + 64, 448 * sizeof(float)); |
| 2540 | } |
| 2541 | } |
| 2542 | |
| 2543 | // buffer update |
| 2544 | if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { |
| 2545 | memcpy( saved, temp + 64, 64 * sizeof(float)); |
| 2546 | ac->fdsp->vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, swindow, 64); |
| 2547 | ac->fdsp->vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, swindow, 64); |
| 2548 | ac->fdsp->vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, swindow, 64); |
| 2549 | memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float)); |
| 2550 | } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) { |
| 2551 | memcpy( saved, buf + 512, 448 * sizeof(float)); |
| 2552 | memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float)); |
| 2553 | } else { // LONG_STOP or ONLY_LONG |
| 2554 | memcpy( saved, buf + 512, 512 * sizeof(float)); |
| 2555 | } |
| 2556 | } |
| 2557 | |
| 2558 | static void imdct_and_windowing_ld(AACContext *ac, SingleChannelElement *sce) |
| 2559 | { |
| 2560 | IndividualChannelStream *ics = &sce->ics; |
| 2561 | float *in = sce->coeffs; |
| 2562 | float *out = sce->ret; |
| 2563 | float *saved = sce->saved; |
| 2564 | float *buf = ac->buf_mdct; |
| 2565 | |
| 2566 | // imdct |
| 2567 | ac->mdct.imdct_half(&ac->mdct_ld, buf, in); |
| 2568 | |
| 2569 | // window overlapping |
| 2570 | if (ics->use_kb_window[1]) { |
| 2571 | // AAC LD uses a low overlap sine window instead of a KBD window |
| 2572 | memcpy(out, saved, 192 * sizeof(float)); |
| 2573 | ac->fdsp->vector_fmul_window(out + 192, saved + 192, buf, ff_sine_128, 64); |
| 2574 | memcpy( out + 320, buf + 64, 192 * sizeof(float)); |
| 2575 | } else { |
| 2576 | ac->fdsp->vector_fmul_window(out, saved, buf, ff_sine_512, 256); |
| 2577 | } |
| 2578 | |
| 2579 | // buffer update |
| 2580 | memcpy(saved, buf + 256, 256 * sizeof(float)); |
| 2581 | } |
| 2582 | |
| 2583 | static void imdct_and_windowing_eld(AACContext *ac, SingleChannelElement *sce) |
| 2584 | { |
| 2585 | float *in = sce->coeffs; |
| 2586 | float *out = sce->ret; |
| 2587 | float *saved = sce->saved; |
| 2588 | const float *const window = ff_aac_eld_window; |
| 2589 | float *buf = ac->buf_mdct; |
| 2590 | int i; |
| 2591 | const int n = 512; |
| 2592 | const int n2 = n >> 1; |
| 2593 | const int n4 = n >> 2; |
| 2594 | |
| 2595 | // Inverse transform, mapped to the conventional IMDCT by |
| 2596 | // Chivukula, R.K.; Reznik, Y.A.; Devarajan, V., |
| 2597 | // "Efficient algorithms for MPEG-4 AAC-ELD, AAC-LD and AAC-LC filterbanks," |
| 2598 | // International Conference on Audio, Language and Image Processing, ICALIP 2008. |
| 2599 | // URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4590245&isnumber=4589950 |
| 2600 | for (i = 0; i < n2; i+=2) { |
| 2601 | float temp; |
| 2602 | temp = in[i ]; in[i ] = -in[n - 1 - i]; in[n - 1 - i] = temp; |
| 2603 | temp = -in[i + 1]; in[i + 1] = in[n - 2 - i]; in[n - 2 - i] = temp; |
| 2604 | } |
| 2605 | ac->mdct.imdct_half(&ac->mdct_ld, buf, in); |
| 2606 | for (i = 0; i < n; i+=2) { |
| 2607 | buf[i] = -buf[i]; |
| 2608 | } |
| 2609 | // Like with the regular IMDCT at this point we still have the middle half |
| 2610 | // of a transform but with even symmetry on the left and odd symmetry on |
| 2611 | // the right |
| 2612 | |
| 2613 | // window overlapping |
| 2614 | // The spec says to use samples [0..511] but the reference decoder uses |
| 2615 | // samples [128..639]. |
| 2616 | for (i = n4; i < n2; i ++) { |
| 2617 | out[i - n4] = buf[n2 - 1 - i] * window[i - n4] + |
| 2618 | saved[ i + n2] * window[i + n - n4] + |
| 2619 | -saved[ n + n2 - 1 - i] * window[i + 2*n - n4] + |
| 2620 | -saved[2*n + n2 + i] * window[i + 3*n - n4]; |
| 2621 | } |
| 2622 | for (i = 0; i < n2; i ++) { |
| 2623 | out[n4 + i] = buf[i] * window[i + n2 - n4] + |
| 2624 | -saved[ n - 1 - i] * window[i + n2 + n - n4] + |
| 2625 | -saved[ n + i] * window[i + n2 + 2*n - n4] + |
| 2626 | saved[2*n + n - 1 - i] * window[i + n2 + 3*n - n4]; |
| 2627 | } |
| 2628 | for (i = 0; i < n4; i ++) { |
| 2629 | out[n2 + n4 + i] = buf[ i + n2] * window[i + n - n4] + |
| 2630 | -saved[ n2 - 1 - i] * window[i + 2*n - n4] + |
| 2631 | -saved[ n + n2 + i] * window[i + 3*n - n4]; |
| 2632 | } |
| 2633 | |
| 2634 | // buffer update |
| 2635 | memmove(saved + n, saved, 2 * n * sizeof(float)); |
| 2636 | memcpy( saved, buf, n * sizeof(float)); |
| 2637 | } |
| 2638 | |
| 2639 | /** |
| 2640 | * Apply dependent channel coupling (applied before IMDCT). |
| 2641 | * |
| 2642 | * @param index index into coupling gain array |
| 2643 | */ |
| 2644 | static void apply_dependent_coupling(AACContext *ac, |
| 2645 | SingleChannelElement *target, |
| 2646 | ChannelElement *cce, int index) |
| 2647 | { |
| 2648 | IndividualChannelStream *ics = &cce->ch[0].ics; |
| 2649 | const uint16_t *offsets = ics->swb_offset; |
| 2650 | float *dest = target->coeffs; |
| 2651 | const float *src = cce->ch[0].coeffs; |
| 2652 | int g, i, group, k, idx = 0; |
| 2653 | if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) { |
| 2654 | av_log(ac->avctx, AV_LOG_ERROR, |
| 2655 | "Dependent coupling is not supported together with LTP\n"); |
| 2656 | return; |
| 2657 | } |
| 2658 | for (g = 0; g < ics->num_window_groups; g++) { |
| 2659 | for (i = 0; i < ics->max_sfb; i++, idx++) { |
| 2660 | if (cce->ch[0].band_type[idx] != ZERO_BT) { |
| 2661 | const float gain = cce->coup.gain[index][idx]; |
| 2662 | for (group = 0; group < ics->group_len[g]; group++) { |
| 2663 | for (k = offsets[i]; k < offsets[i + 1]; k++) { |
| 2664 | // FIXME: SIMDify |
| 2665 | dest[group * 128 + k] += gain * src[group * 128 + k]; |
| 2666 | } |
| 2667 | } |
| 2668 | } |
| 2669 | } |
| 2670 | dest += ics->group_len[g] * 128; |
| 2671 | src += ics->group_len[g] * 128; |
| 2672 | } |
| 2673 | } |
| 2674 | |
| 2675 | /** |
| 2676 | * Apply independent channel coupling (applied after IMDCT). |
| 2677 | * |
| 2678 | * @param index index into coupling gain array |
| 2679 | */ |
| 2680 | static void apply_independent_coupling(AACContext *ac, |
| 2681 | SingleChannelElement *target, |
| 2682 | ChannelElement *cce, int index) |
| 2683 | { |
| 2684 | int i; |
| 2685 | const float gain = cce->coup.gain[index][0]; |
| 2686 | const float *src = cce->ch[0].ret; |
| 2687 | float *dest = target->ret; |
| 2688 | const int len = 1024 << (ac->oc[1].m4ac.sbr == 1); |
| 2689 | |
| 2690 | for (i = 0; i < len; i++) |
| 2691 | dest[i] += gain * src[i]; |
| 2692 | } |
| 2693 | |
| 2694 | /** |
| 2695 | * channel coupling transformation interface |
| 2696 | * |
| 2697 | * @param apply_coupling_method pointer to (in)dependent coupling function |
| 2698 | */ |
| 2699 | static void apply_channel_coupling(AACContext *ac, ChannelElement *cc, |
| 2700 | enum RawDataBlockType type, int elem_id, |
| 2701 | enum CouplingPoint coupling_point, |
| 2702 | void (*apply_coupling_method)(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)) |
| 2703 | { |
| 2704 | int i, c; |
| 2705 | |
| 2706 | for (i = 0; i < MAX_ELEM_ID; i++) { |
| 2707 | ChannelElement *cce = ac->che[TYPE_CCE][i]; |
| 2708 | int index = 0; |
| 2709 | |
| 2710 | if (cce && cce->coup.coupling_point == coupling_point) { |
| 2711 | ChannelCoupling *coup = &cce->coup; |
| 2712 | |
| 2713 | for (c = 0; c <= coup->num_coupled; c++) { |
| 2714 | if (coup->type[c] == type && coup->id_select[c] == elem_id) { |
| 2715 | if (coup->ch_select[c] != 1) { |
| 2716 | apply_coupling_method(ac, &cc->ch[0], cce, index); |
| 2717 | if (coup->ch_select[c] != 0) |
| 2718 | index++; |
| 2719 | } |
| 2720 | if (coup->ch_select[c] != 2) |
| 2721 | apply_coupling_method(ac, &cc->ch[1], cce, index++); |
| 2722 | } else |
| 2723 | index += 1 + (coup->ch_select[c] == 3); |
| 2724 | } |
| 2725 | } |
| 2726 | } |
| 2727 | } |
| 2728 | |
| 2729 | /** |
| 2730 | * Convert spectral data to float samples, applying all supported tools as appropriate. |
| 2731 | */ |
| 2732 | static void spectral_to_sample(AACContext *ac) |
| 2733 | { |
| 2734 | int i, type; |
| 2735 | void (*imdct_and_window)(AACContext *ac, SingleChannelElement *sce); |
| 2736 | switch (ac->oc[1].m4ac.object_type) { |
| 2737 | case AOT_ER_AAC_LD: |
| 2738 | imdct_and_window = imdct_and_windowing_ld; |
| 2739 | break; |
| 2740 | case AOT_ER_AAC_ELD: |
| 2741 | imdct_and_window = imdct_and_windowing_eld; |
| 2742 | break; |
| 2743 | default: |
| 2744 | imdct_and_window = ac->imdct_and_windowing; |
| 2745 | } |
| 2746 | for (type = 3; type >= 0; type--) { |
| 2747 | for (i = 0; i < MAX_ELEM_ID; i++) { |
| 2748 | ChannelElement *che = ac->che[type][i]; |
| 2749 | if (che && che->present) { |
| 2750 | if (type <= TYPE_CPE) |
| 2751 | apply_channel_coupling(ac, che, type, i, BEFORE_TNS, apply_dependent_coupling); |
| 2752 | if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) { |
| 2753 | if (che->ch[0].ics.predictor_present) { |
| 2754 | if (che->ch[0].ics.ltp.present) |
| 2755 | ac->apply_ltp(ac, &che->ch[0]); |
| 2756 | if (che->ch[1].ics.ltp.present && type == TYPE_CPE) |
| 2757 | ac->apply_ltp(ac, &che->ch[1]); |
| 2758 | } |
| 2759 | } |
| 2760 | if (che->ch[0].tns.present) |
| 2761 | ac->apply_tns(che->ch[0].coeffs, &che->ch[0].tns, &che->ch[0].ics, 1); |
| 2762 | if (che->ch[1].tns.present) |
| 2763 | ac->apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1); |
| 2764 | if (type <= TYPE_CPE) |
| 2765 | apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, apply_dependent_coupling); |
| 2766 | if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT) { |
| 2767 | imdct_and_window(ac, &che->ch[0]); |
| 2768 | if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) |
| 2769 | ac->update_ltp(ac, &che->ch[0]); |
| 2770 | if (type == TYPE_CPE) { |
| 2771 | imdct_and_window(ac, &che->ch[1]); |
| 2772 | if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) |
| 2773 | ac->update_ltp(ac, &che->ch[1]); |
| 2774 | } |
| 2775 | if (ac->oc[1].m4ac.sbr > 0) { |
| 2776 | ff_sbr_apply(ac, &che->sbr, type, che->ch[0].ret, che->ch[1].ret); |
| 2777 | } |
| 2778 | } |
| 2779 | if (type <= TYPE_CCE) |
| 2780 | apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, apply_independent_coupling); |
| 2781 | che->present = 0; |
| 2782 | } else if (che) { |
| 2783 | av_log(ac->avctx, AV_LOG_VERBOSE, "ChannelElement %d.%d missing \n", type, i); |
| 2784 | } |
| 2785 | } |
| 2786 | } |
| 2787 | } |
| 2788 | |
| 2789 | static int parse_adts_frame_header(AACContext *ac, GetBitContext *gb) |
| 2790 | { |
| 2791 | int size; |
| 2792 | AACADTSHeaderInfo hdr_info; |
| 2793 | uint8_t layout_map[MAX_ELEM_ID*4][3]; |
| 2794 | int layout_map_tags, ret; |
| 2795 | |
| 2796 | size = avpriv_aac_parse_header(gb, &hdr_info); |
| 2797 | if (size > 0) { |
| 2798 | if (!ac->warned_num_aac_frames && hdr_info.num_aac_frames != 1) { |
| 2799 | // This is 2 for "VLB " audio in NSV files. |
| 2800 | // See samples/nsv/vlb_audio. |
| 2801 | avpriv_report_missing_feature(ac->avctx, |
| 2802 | "More than one AAC RDB per ADTS frame"); |
| 2803 | ac->warned_num_aac_frames = 1; |
| 2804 | } |
| 2805 | push_output_configuration(ac); |
| 2806 | if (hdr_info.chan_config) { |
| 2807 | ac->oc[1].m4ac.chan_config = hdr_info.chan_config; |
| 2808 | if ((ret = set_default_channel_config(ac->avctx, |
| 2809 | layout_map, |
| 2810 | &layout_map_tags, |
| 2811 | hdr_info.chan_config)) < 0) |
| 2812 | return ret; |
| 2813 | if ((ret = output_configure(ac, layout_map, layout_map_tags, |
| 2814 | FFMAX(ac->oc[1].status, |
| 2815 | OC_TRIAL_FRAME), 0)) < 0) |
| 2816 | return ret; |
| 2817 | } else { |
| 2818 | ac->oc[1].m4ac.chan_config = 0; |
| 2819 | /** |
| 2820 | * dual mono frames in Japanese DTV can have chan_config 0 |
| 2821 | * WITHOUT specifying PCE. |
| 2822 | * thus, set dual mono as default. |
| 2823 | */ |
| 2824 | if (ac->dmono_mode && ac->oc[0].status == OC_NONE) { |
| 2825 | layout_map_tags = 2; |
| 2826 | layout_map[0][0] = layout_map[1][0] = TYPE_SCE; |
| 2827 | layout_map[0][2] = layout_map[1][2] = AAC_CHANNEL_FRONT; |
| 2828 | layout_map[0][1] = 0; |
| 2829 | layout_map[1][1] = 1; |
| 2830 | if (output_configure(ac, layout_map, layout_map_tags, |
| 2831 | OC_TRIAL_FRAME, 0)) |
| 2832 | return -7; |
| 2833 | } |
| 2834 | } |
| 2835 | ac->oc[1].m4ac.sample_rate = hdr_info.sample_rate; |
| 2836 | ac->oc[1].m4ac.sampling_index = hdr_info.sampling_index; |
| 2837 | ac->oc[1].m4ac.object_type = hdr_info.object_type; |
| 2838 | if (ac->oc[0].status != OC_LOCKED || |
| 2839 | ac->oc[0].m4ac.chan_config != hdr_info.chan_config || |
| 2840 | ac->oc[0].m4ac.sample_rate != hdr_info.sample_rate) { |
| 2841 | ac->oc[1].m4ac.sbr = -1; |
| 2842 | ac->oc[1].m4ac.ps = -1; |
| 2843 | } |
| 2844 | if (!hdr_info.crc_absent) |
| 2845 | skip_bits(gb, 16); |
| 2846 | } |
| 2847 | return size; |
| 2848 | } |
| 2849 | |
| 2850 | static int aac_decode_er_frame(AVCodecContext *avctx, void *data, |
| 2851 | int *got_frame_ptr, GetBitContext *gb) |
| 2852 | { |
| 2853 | AACContext *ac = avctx->priv_data; |
| 2854 | ChannelElement *che; |
| 2855 | int err, i; |
| 2856 | int samples = 1024; |
| 2857 | int chan_config = ac->oc[1].m4ac.chan_config; |
| 2858 | int aot = ac->oc[1].m4ac.object_type; |
| 2859 | |
| 2860 | if (aot == AOT_ER_AAC_LD || aot == AOT_ER_AAC_ELD) |
| 2861 | samples >>= 1; |
| 2862 | |
| 2863 | ac->frame = data; |
| 2864 | |
| 2865 | if ((err = frame_configure_elements(avctx)) < 0) |
| 2866 | return err; |
| 2867 | |
| 2868 | // The FF_PROFILE_AAC_* defines are all object_type - 1 |
| 2869 | // This may lead to an undefined profile being signaled |
| 2870 | ac->avctx->profile = ac->oc[1].m4ac.object_type - 1; |
| 2871 | |
| 2872 | ac->tags_mapped = 0; |
| 2873 | |
| 2874 | if (chan_config < 0 || chan_config >= 8) { |
| 2875 | avpriv_request_sample(avctx, "Unknown ER channel configuration %d", |
| 2876 | ac->oc[1].m4ac.chan_config); |
| 2877 | return AVERROR_INVALIDDATA; |
| 2878 | } |
| 2879 | for (i = 0; i < tags_per_config[chan_config]; i++) { |
| 2880 | const int elem_type = aac_channel_layout_map[chan_config-1][i][0]; |
| 2881 | const int elem_id = aac_channel_layout_map[chan_config-1][i][1]; |
| 2882 | if (!(che=get_che(ac, elem_type, elem_id))) { |
| 2883 | av_log(ac->avctx, AV_LOG_ERROR, |
| 2884 | "channel element %d.%d is not allocated\n", |
| 2885 | elem_type, elem_id); |
| 2886 | return AVERROR_INVALIDDATA; |
| 2887 | } |
| 2888 | che->present = 1; |
| 2889 | if (aot != AOT_ER_AAC_ELD) |
| 2890 | skip_bits(gb, 4); |
| 2891 | switch (elem_type) { |
| 2892 | case TYPE_SCE: |
| 2893 | err = decode_ics(ac, &che->ch[0], gb, 0, 0); |
| 2894 | break; |
| 2895 | case TYPE_CPE: |
| 2896 | err = decode_cpe(ac, gb, che); |
| 2897 | break; |
| 2898 | case TYPE_LFE: |
| 2899 | err = decode_ics(ac, &che->ch[0], gb, 0, 0); |
| 2900 | break; |
| 2901 | } |
| 2902 | if (err < 0) |
| 2903 | return err; |
| 2904 | } |
| 2905 | |
| 2906 | spectral_to_sample(ac); |
| 2907 | |
| 2908 | ac->frame->nb_samples = samples; |
| 2909 | ac->frame->sample_rate = avctx->sample_rate; |
| 2910 | *got_frame_ptr = 1; |
| 2911 | |
| 2912 | skip_bits_long(gb, get_bits_left(gb)); |
| 2913 | return 0; |
| 2914 | } |
| 2915 | |
| 2916 | static int aac_decode_frame_int(AVCodecContext *avctx, void *data, |
| 2917 | int *got_frame_ptr, GetBitContext *gb, AVPacket *avpkt) |
| 2918 | { |
| 2919 | AACContext *ac = avctx->priv_data; |
| 2920 | ChannelElement *che = NULL, *che_prev = NULL; |
| 2921 | enum RawDataBlockType elem_type, elem_type_prev = TYPE_END; |
| 2922 | int err, elem_id; |
| 2923 | int samples = 0, multiplier, audio_found = 0, pce_found = 0; |
| 2924 | int is_dmono, sce_count = 0; |
| 2925 | |
| 2926 | ac->frame = data; |
| 2927 | |
| 2928 | if (show_bits(gb, 12) == 0xfff) { |
| 2929 | if ((err = parse_adts_frame_header(ac, gb)) < 0) { |
| 2930 | av_log(avctx, AV_LOG_ERROR, "Error decoding AAC frame header.\n"); |
| 2931 | goto fail; |
| 2932 | } |
| 2933 | if (ac->oc[1].m4ac.sampling_index > 12) { |
| 2934 | av_log(ac->avctx, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->oc[1].m4ac.sampling_index); |
| 2935 | err = AVERROR_INVALIDDATA; |
| 2936 | goto fail; |
| 2937 | } |
| 2938 | } |
| 2939 | |
| 2940 | if ((err = frame_configure_elements(avctx)) < 0) |
| 2941 | goto fail; |
| 2942 | |
| 2943 | // The FF_PROFILE_AAC_* defines are all object_type - 1 |
| 2944 | // This may lead to an undefined profile being signaled |
| 2945 | ac->avctx->profile = ac->oc[1].m4ac.object_type - 1; |
| 2946 | |
| 2947 | ac->tags_mapped = 0; |
| 2948 | // parse |
| 2949 | while ((elem_type = get_bits(gb, 3)) != TYPE_END) { |
| 2950 | elem_id = get_bits(gb, 4); |
| 2951 | |
| 2952 | if (avctx->debug & FF_DEBUG_STARTCODE) |
| 2953 | av_log(avctx, AV_LOG_DEBUG, "Elem type:%x id:%x\n", elem_type, elem_id); |
| 2954 | |
| 2955 | if (elem_type < TYPE_DSE) { |
| 2956 | if (!(che=get_che(ac, elem_type, elem_id))) { |
| 2957 | av_log(ac->avctx, AV_LOG_ERROR, "channel element %d.%d is not allocated\n", |
| 2958 | elem_type, elem_id); |
| 2959 | err = AVERROR_INVALIDDATA; |
| 2960 | goto fail; |
| 2961 | } |
| 2962 | samples = 1024; |
| 2963 | che->present = 1; |
| 2964 | } |
| 2965 | |
| 2966 | switch (elem_type) { |
| 2967 | |
| 2968 | case TYPE_SCE: |
| 2969 | err = decode_ics(ac, &che->ch[0], gb, 0, 0); |
| 2970 | audio_found = 1; |
| 2971 | sce_count++; |
| 2972 | break; |
| 2973 | |
| 2974 | case TYPE_CPE: |
| 2975 | err = decode_cpe(ac, gb, che); |
| 2976 | audio_found = 1; |
| 2977 | break; |
| 2978 | |
| 2979 | case TYPE_CCE: |
| 2980 | err = decode_cce(ac, gb, che); |
| 2981 | break; |
| 2982 | |
| 2983 | case TYPE_LFE: |
| 2984 | err = decode_ics(ac, &che->ch[0], gb, 0, 0); |
| 2985 | audio_found = 1; |
| 2986 | break; |
| 2987 | |
| 2988 | case TYPE_DSE: |
| 2989 | err = skip_data_stream_element(ac, gb); |
| 2990 | break; |
| 2991 | |
| 2992 | case TYPE_PCE: { |
| 2993 | uint8_t layout_map[MAX_ELEM_ID*4][3]; |
| 2994 | int tags; |
| 2995 | push_output_configuration(ac); |
| 2996 | tags = decode_pce(avctx, &ac->oc[1].m4ac, layout_map, gb); |
| 2997 | if (tags < 0) { |
| 2998 | err = tags; |
| 2999 | break; |
| 3000 | } |
| 3001 | if (pce_found) { |
| 3002 | av_log(avctx, AV_LOG_ERROR, |
| 3003 | "Not evaluating a further program_config_element as this construct is dubious at best.\n"); |
| 3004 | } else { |
| 3005 | err = output_configure(ac, layout_map, tags, OC_TRIAL_PCE, 1); |
| 3006 | if (!err) |
| 3007 | ac->oc[1].m4ac.chan_config = 0; |
| 3008 | pce_found = 1; |
| 3009 | } |
| 3010 | break; |
| 3011 | } |
| 3012 | |
| 3013 | case TYPE_FIL: |
| 3014 | if (elem_id == 15) |
| 3015 | elem_id += get_bits(gb, 8) - 1; |
| 3016 | if (get_bits_left(gb) < 8 * elem_id) { |
| 3017 | av_log(avctx, AV_LOG_ERROR, "TYPE_FIL: "overread_err); |
| 3018 | err = AVERROR_INVALIDDATA; |
| 3019 | goto fail; |
| 3020 | } |
| 3021 | while (elem_id > 0) |
| 3022 | elem_id -= decode_extension_payload(ac, gb, elem_id, che_prev, elem_type_prev); |
| 3023 | err = 0; /* FIXME */ |
| 3024 | break; |
| 3025 | |
| 3026 | default: |
| 3027 | err = AVERROR_BUG; /* should not happen, but keeps compiler happy */ |
| 3028 | break; |
| 3029 | } |
| 3030 | |
| 3031 | che_prev = che; |
| 3032 | elem_type_prev = elem_type; |
| 3033 | |
| 3034 | if (err) |
| 3035 | goto fail; |
| 3036 | |
| 3037 | if (get_bits_left(gb) < 3) { |
| 3038 | av_log(avctx, AV_LOG_ERROR, overread_err); |
| 3039 | err = AVERROR_INVALIDDATA; |
| 3040 | goto fail; |
| 3041 | } |
| 3042 | } |
| 3043 | |
| 3044 | spectral_to_sample(ac); |
| 3045 | |
| 3046 | multiplier = (ac->oc[1].m4ac.sbr == 1) ? ac->oc[1].m4ac.ext_sample_rate > ac->oc[1].m4ac.sample_rate : 0; |
| 3047 | samples <<= multiplier; |
| 3048 | |
| 3049 | if (ac->oc[1].status && audio_found) { |
| 3050 | avctx->sample_rate = ac->oc[1].m4ac.sample_rate << multiplier; |
| 3051 | avctx->frame_size = samples; |
| 3052 | ac->oc[1].status = OC_LOCKED; |
| 3053 | } |
| 3054 | |
| 3055 | if (multiplier) { |
| 3056 | int side_size; |
| 3057 | const uint8_t *side = av_packet_get_side_data(avpkt, AV_PKT_DATA_SKIP_SAMPLES, &side_size); |
| 3058 | if (side && side_size>=4) |
| 3059 | AV_WL32(side, 2*AV_RL32(side)); |
| 3060 | } |
| 3061 | |
| 3062 | *got_frame_ptr = !!samples; |
| 3063 | if (samples) { |
| 3064 | ac->frame->nb_samples = samples; |
| 3065 | ac->frame->sample_rate = avctx->sample_rate; |
| 3066 | } else |
| 3067 | av_frame_unref(ac->frame); |
| 3068 | *got_frame_ptr = !!samples; |
| 3069 | |
| 3070 | /* for dual-mono audio (SCE + SCE) */ |
| 3071 | is_dmono = ac->dmono_mode && sce_count == 2 && |
| 3072 | ac->oc[1].channel_layout == (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT); |
| 3073 | if (is_dmono) { |
| 3074 | if (ac->dmono_mode == 1) |
| 3075 | ((AVFrame *)data)->data[1] =((AVFrame *)data)->data[0]; |
| 3076 | else if (ac->dmono_mode == 2) |
| 3077 | ((AVFrame *)data)->data[0] =((AVFrame *)data)->data[1]; |
| 3078 | } |
| 3079 | |
| 3080 | return 0; |
| 3081 | fail: |
| 3082 | pop_output_configuration(ac); |
| 3083 | return err; |
| 3084 | } |
| 3085 | |
| 3086 | static int aac_decode_frame(AVCodecContext *avctx, void *data, |
| 3087 | int *got_frame_ptr, AVPacket *avpkt) |
| 3088 | { |
| 3089 | AACContext *ac = avctx->priv_data; |
| 3090 | const uint8_t *buf = avpkt->data; |
| 3091 | int buf_size = avpkt->size; |
| 3092 | GetBitContext gb; |
| 3093 | int buf_consumed; |
| 3094 | int buf_offset; |
| 3095 | int err; |
| 3096 | int new_extradata_size; |
| 3097 | const uint8_t *new_extradata = av_packet_get_side_data(avpkt, |
| 3098 | AV_PKT_DATA_NEW_EXTRADATA, |
| 3099 | &new_extradata_size); |
| 3100 | int jp_dualmono_size; |
| 3101 | const uint8_t *jp_dualmono = av_packet_get_side_data(avpkt, |
| 3102 | AV_PKT_DATA_JP_DUALMONO, |
| 3103 | &jp_dualmono_size); |
| 3104 | |
| 3105 | if (new_extradata && 0) { |
| 3106 | av_free(avctx->extradata); |
| 3107 | avctx->extradata = av_mallocz(new_extradata_size + |
| 3108 | FF_INPUT_BUFFER_PADDING_SIZE); |
| 3109 | if (!avctx->extradata) |
| 3110 | return AVERROR(ENOMEM); |
| 3111 | avctx->extradata_size = new_extradata_size; |
| 3112 | memcpy(avctx->extradata, new_extradata, new_extradata_size); |
| 3113 | push_output_configuration(ac); |
| 3114 | if (decode_audio_specific_config(ac, ac->avctx, &ac->oc[1].m4ac, |
| 3115 | avctx->extradata, |
| 3116 | avctx->extradata_size*8, 1) < 0) { |
| 3117 | pop_output_configuration(ac); |
| 3118 | return AVERROR_INVALIDDATA; |
| 3119 | } |
| 3120 | } |
| 3121 | |
| 3122 | ac->dmono_mode = 0; |
| 3123 | if (jp_dualmono && jp_dualmono_size > 0) |
| 3124 | ac->dmono_mode = 1 + *jp_dualmono; |
| 3125 | if (ac->force_dmono_mode >= 0) |
| 3126 | ac->dmono_mode = ac->force_dmono_mode; |
| 3127 | |
| 3128 | if (INT_MAX / 8 <= buf_size) |
| 3129 | return AVERROR_INVALIDDATA; |
| 3130 | |
| 3131 | if ((err = init_get_bits(&gb, buf, buf_size * 8)) < 0) |
| 3132 | return err; |
| 3133 | |
| 3134 | switch (ac->oc[1].m4ac.object_type) { |
| 3135 | case AOT_ER_AAC_LC: |
| 3136 | case AOT_ER_AAC_LTP: |
| 3137 | case AOT_ER_AAC_LD: |
| 3138 | case AOT_ER_AAC_ELD: |
| 3139 | err = aac_decode_er_frame(avctx, data, got_frame_ptr, &gb); |
| 3140 | break; |
| 3141 | default: |
| 3142 | err = aac_decode_frame_int(avctx, data, got_frame_ptr, &gb, avpkt); |
| 3143 | } |
| 3144 | if (err < 0) |
| 3145 | return err; |
| 3146 | |
| 3147 | buf_consumed = (get_bits_count(&gb) + 7) >> 3; |
| 3148 | for (buf_offset = buf_consumed; buf_offset < buf_size; buf_offset++) |
| 3149 | if (buf[buf_offset]) |
| 3150 | break; |
| 3151 | |
| 3152 | return buf_size > buf_offset ? buf_consumed : buf_size; |
| 3153 | } |
| 3154 | |
| 3155 | static av_cold int aac_decode_close(AVCodecContext *avctx) |
| 3156 | { |
| 3157 | AACContext *ac = avctx->priv_data; |
| 3158 | int i, type; |
| 3159 | |
| 3160 | for (i = 0; i < MAX_ELEM_ID; i++) { |
| 3161 | for (type = 0; type < 4; type++) { |
| 3162 | if (ac->che[type][i]) |
| 3163 | ff_aac_sbr_ctx_close(&ac->che[type][i]->sbr); |
| 3164 | av_freep(&ac->che[type][i]); |
| 3165 | } |
| 3166 | } |
| 3167 | |
| 3168 | ff_mdct_end(&ac->mdct); |
| 3169 | ff_mdct_end(&ac->mdct_small); |
| 3170 | ff_mdct_end(&ac->mdct_ld); |
| 3171 | ff_mdct_end(&ac->mdct_ltp); |
| 3172 | av_freep(&ac->fdsp); |
| 3173 | return 0; |
| 3174 | } |
| 3175 | |
| 3176 | |
| 3177 | #define LOAS_SYNC_WORD 0x2b7 ///< 11 bits LOAS sync word |
| 3178 | |
| 3179 | struct LATMContext { |
| 3180 | AACContext aac_ctx; ///< containing AACContext |
| 3181 | int initialized; ///< initialized after a valid extradata was seen |
| 3182 | |
| 3183 | // parser data |
| 3184 | int audio_mux_version_A; ///< LATM syntax version |
| 3185 | int frame_length_type; ///< 0/1 variable/fixed frame length |
| 3186 | int frame_length; ///< frame length for fixed frame length |
| 3187 | }; |
| 3188 | |
| 3189 | static inline uint32_t latm_get_value(GetBitContext *b) |
| 3190 | { |
| 3191 | int length = get_bits(b, 2); |
| 3192 | |
| 3193 | return get_bits_long(b, (length+1)*8); |
| 3194 | } |
| 3195 | |
| 3196 | static int latm_decode_audio_specific_config(struct LATMContext *latmctx, |
| 3197 | GetBitContext *gb, int asclen) |
| 3198 | { |
| 3199 | AACContext *ac = &latmctx->aac_ctx; |
| 3200 | AVCodecContext *avctx = ac->avctx; |
| 3201 | MPEG4AudioConfig m4ac = { 0 }; |
| 3202 | int config_start_bit = get_bits_count(gb); |
| 3203 | int sync_extension = 0; |
| 3204 | int bits_consumed, esize; |
| 3205 | |
| 3206 | if (asclen) { |
| 3207 | sync_extension = 1; |
| 3208 | asclen = FFMIN(asclen, get_bits_left(gb)); |
| 3209 | } else |
| 3210 | asclen = get_bits_left(gb); |
| 3211 | |
| 3212 | if (config_start_bit % 8) { |
| 3213 | avpriv_request_sample(latmctx->aac_ctx.avctx, |
| 3214 | "Non-byte-aligned audio-specific config"); |
| 3215 | return AVERROR_PATCHWELCOME; |
| 3216 | } |
| 3217 | if (asclen <= 0) |
| 3218 | return AVERROR_INVALIDDATA; |
| 3219 | bits_consumed = decode_audio_specific_config(NULL, avctx, &m4ac, |
| 3220 | gb->buffer + (config_start_bit / 8), |
| 3221 | asclen, sync_extension); |
| 3222 | |
| 3223 | if (bits_consumed < 0) |
| 3224 | return AVERROR_INVALIDDATA; |
| 3225 | |
| 3226 | if (!latmctx->initialized || |
| 3227 | ac->oc[1].m4ac.sample_rate != m4ac.sample_rate || |
| 3228 | ac->oc[1].m4ac.chan_config != m4ac.chan_config) { |
| 3229 | |
| 3230 | if(latmctx->initialized) { |
| 3231 | av_log(avctx, AV_LOG_INFO, "audio config changed\n"); |
| 3232 | } else { |
| 3233 | av_log(avctx, AV_LOG_DEBUG, "initializing latmctx\n"); |
| 3234 | } |
| 3235 | latmctx->initialized = 0; |
| 3236 | |
| 3237 | esize = (bits_consumed+7) / 8; |
| 3238 | |
| 3239 | if (avctx->extradata_size < esize) { |
| 3240 | av_free(avctx->extradata); |
| 3241 | avctx->extradata = av_malloc(esize + FF_INPUT_BUFFER_PADDING_SIZE); |
| 3242 | if (!avctx->extradata) |
| 3243 | return AVERROR(ENOMEM); |
| 3244 | } |
| 3245 | |
| 3246 | avctx->extradata_size = esize; |
| 3247 | memcpy(avctx->extradata, gb->buffer + (config_start_bit/8), esize); |
| 3248 | memset(avctx->extradata+esize, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| 3249 | } |
| 3250 | skip_bits_long(gb, bits_consumed); |
| 3251 | |
| 3252 | return bits_consumed; |
| 3253 | } |
| 3254 | |
| 3255 | static int read_stream_mux_config(struct LATMContext *latmctx, |
| 3256 | GetBitContext *gb) |
| 3257 | { |
| 3258 | int ret, audio_mux_version = get_bits(gb, 1); |
| 3259 | |
| 3260 | latmctx->audio_mux_version_A = 0; |
| 3261 | if (audio_mux_version) |
| 3262 | latmctx->audio_mux_version_A = get_bits(gb, 1); |
| 3263 | |
| 3264 | if (!latmctx->audio_mux_version_A) { |
| 3265 | |
| 3266 | if (audio_mux_version) |
| 3267 | latm_get_value(gb); // taraFullness |
| 3268 | |
| 3269 | skip_bits(gb, 1); // allStreamSameTimeFraming |
| 3270 | skip_bits(gb, 6); // numSubFrames |
| 3271 | // numPrograms |
| 3272 | if (get_bits(gb, 4)) { // numPrograms |
| 3273 | avpriv_request_sample(latmctx->aac_ctx.avctx, "Multiple programs"); |
| 3274 | return AVERROR_PATCHWELCOME; |
| 3275 | } |
| 3276 | |
| 3277 | // for each program (which there is only one in DVB) |
| 3278 | |
| 3279 | // for each layer (which there is only one in DVB) |
| 3280 | if (get_bits(gb, 3)) { // numLayer |
| 3281 | avpriv_request_sample(latmctx->aac_ctx.avctx, "Multiple layers"); |
| 3282 | return AVERROR_PATCHWELCOME; |
| 3283 | } |
| 3284 | |
| 3285 | // for all but first stream: use_same_config = get_bits(gb, 1); |
| 3286 | if (!audio_mux_version) { |
| 3287 | if ((ret = latm_decode_audio_specific_config(latmctx, gb, 0)) < 0) |
| 3288 | return ret; |
| 3289 | } else { |
| 3290 | int ascLen = latm_get_value(gb); |
| 3291 | if ((ret = latm_decode_audio_specific_config(latmctx, gb, ascLen)) < 0) |
| 3292 | return ret; |
| 3293 | ascLen -= ret; |
| 3294 | skip_bits_long(gb, ascLen); |
| 3295 | } |
| 3296 | |
| 3297 | latmctx->frame_length_type = get_bits(gb, 3); |
| 3298 | switch (latmctx->frame_length_type) { |
| 3299 | case 0: |
| 3300 | skip_bits(gb, 8); // latmBufferFullness |
| 3301 | break; |
| 3302 | case 1: |
| 3303 | latmctx->frame_length = get_bits(gb, 9); |
| 3304 | break; |
| 3305 | case 3: |
| 3306 | case 4: |
| 3307 | case 5: |
| 3308 | skip_bits(gb, 6); // CELP frame length table index |
| 3309 | break; |
| 3310 | case 6: |
| 3311 | case 7: |
| 3312 | skip_bits(gb, 1); // HVXC frame length table index |
| 3313 | break; |
| 3314 | } |
| 3315 | |
| 3316 | if (get_bits(gb, 1)) { // other data |
| 3317 | if (audio_mux_version) { |
| 3318 | latm_get_value(gb); // other_data_bits |
| 3319 | } else { |
| 3320 | int esc; |
| 3321 | do { |
| 3322 | esc = get_bits(gb, 1); |
| 3323 | skip_bits(gb, 8); |
| 3324 | } while (esc); |
| 3325 | } |
| 3326 | } |
| 3327 | |
| 3328 | if (get_bits(gb, 1)) // crc present |
| 3329 | skip_bits(gb, 8); // config_crc |
| 3330 | } |
| 3331 | |
| 3332 | return 0; |
| 3333 | } |
| 3334 | |
| 3335 | static int read_payload_length_info(struct LATMContext *ctx, GetBitContext *gb) |
| 3336 | { |
| 3337 | uint8_t tmp; |
| 3338 | |
| 3339 | if (ctx->frame_length_type == 0) { |
| 3340 | int mux_slot_length = 0; |
| 3341 | do { |
| 3342 | tmp = get_bits(gb, 8); |
| 3343 | mux_slot_length += tmp; |
| 3344 | } while (tmp == 255); |
| 3345 | return mux_slot_length; |
| 3346 | } else if (ctx->frame_length_type == 1) { |
| 3347 | return ctx->frame_length; |
| 3348 | } else if (ctx->frame_length_type == 3 || |
| 3349 | ctx->frame_length_type == 5 || |
| 3350 | ctx->frame_length_type == 7) { |
| 3351 | skip_bits(gb, 2); // mux_slot_length_coded |
| 3352 | } |
| 3353 | return 0; |
| 3354 | } |
| 3355 | |
| 3356 | static int read_audio_mux_element(struct LATMContext *latmctx, |
| 3357 | GetBitContext *gb) |
| 3358 | { |
| 3359 | int err; |
| 3360 | uint8_t use_same_mux = get_bits(gb, 1); |
| 3361 | if (!use_same_mux) { |
| 3362 | if ((err = read_stream_mux_config(latmctx, gb)) < 0) |
| 3363 | return err; |
| 3364 | } else if (!latmctx->aac_ctx.avctx->extradata) { |
| 3365 | av_log(latmctx->aac_ctx.avctx, AV_LOG_DEBUG, |
| 3366 | "no decoder config found\n"); |
| 3367 | return AVERROR(EAGAIN); |
| 3368 | } |
| 3369 | if (latmctx->audio_mux_version_A == 0) { |
| 3370 | int mux_slot_length_bytes = read_payload_length_info(latmctx, gb); |
| 3371 | if (mux_slot_length_bytes * 8 > get_bits_left(gb)) { |
| 3372 | av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR, "incomplete frame\n"); |
| 3373 | return AVERROR_INVALIDDATA; |
| 3374 | } else if (mux_slot_length_bytes * 8 + 256 < get_bits_left(gb)) { |
| 3375 | av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR, |
| 3376 | "frame length mismatch %d << %d\n", |
| 3377 | mux_slot_length_bytes * 8, get_bits_left(gb)); |
| 3378 | return AVERROR_INVALIDDATA; |
| 3379 | } |
| 3380 | } |
| 3381 | return 0; |
| 3382 | } |
| 3383 | |
| 3384 | |
| 3385 | static int latm_decode_frame(AVCodecContext *avctx, void *out, |
| 3386 | int *got_frame_ptr, AVPacket *avpkt) |
| 3387 | { |
| 3388 | struct LATMContext *latmctx = avctx->priv_data; |
| 3389 | int muxlength, err; |
| 3390 | GetBitContext gb; |
| 3391 | |
| 3392 | if ((err = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0) |
| 3393 | return err; |
| 3394 | |
| 3395 | // check for LOAS sync word |
| 3396 | if (get_bits(&gb, 11) != LOAS_SYNC_WORD) |
| 3397 | return AVERROR_INVALIDDATA; |
| 3398 | |
| 3399 | muxlength = get_bits(&gb, 13) + 3; |
| 3400 | // not enough data, the parser should have sorted this out |
| 3401 | if (muxlength > avpkt->size) |
| 3402 | return AVERROR_INVALIDDATA; |
| 3403 | |
| 3404 | if ((err = read_audio_mux_element(latmctx, &gb)) < 0) |
| 3405 | return err; |
| 3406 | |
| 3407 | if (!latmctx->initialized) { |
| 3408 | if (!avctx->extradata) { |
| 3409 | *got_frame_ptr = 0; |
| 3410 | return avpkt->size; |
| 3411 | } else { |
| 3412 | push_output_configuration(&latmctx->aac_ctx); |
| 3413 | if ((err = decode_audio_specific_config( |
| 3414 | &latmctx->aac_ctx, avctx, &latmctx->aac_ctx.oc[1].m4ac, |
| 3415 | avctx->extradata, avctx->extradata_size*8, 1)) < 0) { |
| 3416 | pop_output_configuration(&latmctx->aac_ctx); |
| 3417 | return err; |
| 3418 | } |
| 3419 | latmctx->initialized = 1; |
| 3420 | } |
| 3421 | } |
| 3422 | |
| 3423 | if (show_bits(&gb, 12) == 0xfff) { |
| 3424 | av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR, |
| 3425 | "ADTS header detected, probably as result of configuration " |
| 3426 | "misparsing\n"); |
| 3427 | return AVERROR_INVALIDDATA; |
| 3428 | } |
| 3429 | |
| 3430 | if ((err = aac_decode_frame_int(avctx, out, got_frame_ptr, &gb, avpkt)) < 0) |
| 3431 | return err; |
| 3432 | |
| 3433 | return muxlength; |
| 3434 | } |
| 3435 | |
| 3436 | static av_cold int latm_decode_init(AVCodecContext *avctx) |
| 3437 | { |
| 3438 | struct LATMContext *latmctx = avctx->priv_data; |
| 3439 | int ret = aac_decode_init(avctx); |
| 3440 | |
| 3441 | if (avctx->extradata_size > 0) |
| 3442 | latmctx->initialized = !ret; |
| 3443 | |
| 3444 | return ret; |
| 3445 | } |
| 3446 | |
| 3447 | static void aacdec_init(AACContext *c) |
| 3448 | { |
| 3449 | c->imdct_and_windowing = imdct_and_windowing; |
| 3450 | c->apply_ltp = apply_ltp; |
| 3451 | c->apply_tns = apply_tns; |
| 3452 | c->windowing_and_mdct_ltp = windowing_and_mdct_ltp; |
| 3453 | c->update_ltp = update_ltp; |
| 3454 | |
| 3455 | if(ARCH_MIPS) |
| 3456 | ff_aacdec_init_mips(c); |
| 3457 | } |
| 3458 | /** |
| 3459 | * AVOptions for Japanese DTV specific extensions (ADTS only) |
| 3460 | */ |
| 3461 | #define AACDEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM |
| 3462 | static const AVOption options[] = { |
| 3463 | {"dual_mono_mode", "Select the channel to decode for dual mono", |
| 3464 | offsetof(AACContext, force_dmono_mode), AV_OPT_TYPE_INT, {.i64=-1}, -1, 2, |
| 3465 | AACDEC_FLAGS, "dual_mono_mode"}, |
| 3466 | |
| 3467 | {"auto", "autoselection", 0, AV_OPT_TYPE_CONST, {.i64=-1}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"}, |
| 3468 | {"main", "Select Main/Left channel", 0, AV_OPT_TYPE_CONST, {.i64= 1}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"}, |
| 3469 | {"sub" , "Select Sub/Right channel", 0, AV_OPT_TYPE_CONST, {.i64= 2}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"}, |
| 3470 | {"both", "Select both channels", 0, AV_OPT_TYPE_CONST, {.i64= 0}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"}, |
| 3471 | |
| 3472 | {NULL}, |
| 3473 | }; |
| 3474 | |
| 3475 | static const AVClass aac_decoder_class = { |
| 3476 | .class_name = "AAC decoder", |
| 3477 | .item_name = av_default_item_name, |
| 3478 | .option = options, |
| 3479 | .version = LIBAVUTIL_VERSION_INT, |
| 3480 | }; |
| 3481 | |
| 3482 | static const AVProfile profiles[] = { |
| 3483 | { FF_PROFILE_AAC_MAIN, "Main" }, |
| 3484 | { FF_PROFILE_AAC_LOW, "LC" }, |
| 3485 | { FF_PROFILE_AAC_SSR, "SSR" }, |
| 3486 | { FF_PROFILE_AAC_LTP, "LTP" }, |
| 3487 | { FF_PROFILE_AAC_HE, "HE-AAC" }, |
| 3488 | { FF_PROFILE_AAC_HE_V2, "HE-AACv2" }, |
| 3489 | { FF_PROFILE_AAC_LD, "LD" }, |
| 3490 | { FF_PROFILE_AAC_ELD, "ELD" }, |
| 3491 | { FF_PROFILE_UNKNOWN }, |
| 3492 | }; |
| 3493 | |
| 3494 | AVCodec ff_aac_decoder = { |
| 3495 | .name = "aac", |
| 3496 | .long_name = NULL_IF_CONFIG_SMALL("AAC (Advanced Audio Coding)"), |
| 3497 | .type = AVMEDIA_TYPE_AUDIO, |
| 3498 | .id = AV_CODEC_ID_AAC, |
| 3499 | .priv_data_size = sizeof(AACContext), |
| 3500 | .init = aac_decode_init, |
| 3501 | .close = aac_decode_close, |
| 3502 | .decode = aac_decode_frame, |
| 3503 | .sample_fmts = (const enum AVSampleFormat[]) { |
| 3504 | AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE |
| 3505 | }, |
| 3506 | .capabilities = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1, |
| 3507 | .channel_layouts = aac_channel_layout, |
| 3508 | .flush = flush, |
| 3509 | .priv_class = &aac_decoder_class, |
| 3510 | .profiles = profiles, |
| 3511 | }; |
| 3512 | |
| 3513 | /* |
| 3514 | Note: This decoder filter is intended to decode LATM streams transferred |
| 3515 | in MPEG transport streams which only contain one program. |
| 3516 | To do a more complex LATM demuxing a separate LATM demuxer should be used. |
| 3517 | */ |
| 3518 | AVCodec ff_aac_latm_decoder = { |
| 3519 | .name = "aac_latm", |
| 3520 | .long_name = NULL_IF_CONFIG_SMALL("AAC LATM (Advanced Audio Coding LATM syntax)"), |
| 3521 | .type = AVMEDIA_TYPE_AUDIO, |
| 3522 | .id = AV_CODEC_ID_AAC_LATM, |
| 3523 | .priv_data_size = sizeof(struct LATMContext), |
| 3524 | .init = latm_decode_init, |
| 3525 | .close = aac_decode_close, |
| 3526 | .decode = latm_decode_frame, |
| 3527 | .sample_fmts = (const enum AVSampleFormat[]) { |
| 3528 | AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE |
| 3529 | }, |
| 3530 | .capabilities = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1, |
| 3531 | .channel_layouts = aac_channel_layout, |
| 3532 | .flush = flush, |
| 3533 | .profiles = profiles, |
| 3534 | }; |