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 * AAC decoder fixed-point implementation
12 * Copyright (c) 2013
13 * MIPS Technologies, Inc., California.
14 *
15 * This file is part of FFmpeg.
16 *
17 * FFmpeg is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU Lesser General Public
19 * License as published by the Free Software Foundation; either
20 * version 2.1 of the License, or (at your option) any later version.
21 *
22 * FFmpeg is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * Lesser General Public License for more details.
26 *
27 * You should have received a copy of the GNU Lesser General Public
28 * License along with FFmpeg; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 */
31
32 /**
33 * @file
34 * AAC decoder
35 * @author Oded Shimon ( ods15 ods15 dyndns org )
36 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
37 *
38 * AAC decoder fixed-point implementation
39 * @author Stanislav Ocovaj ( stanislav.ocovaj imgtec com )
40 * @author Nedeljko Babic ( nedeljko.babic imgtec com )
41 */
42
43 /*
44 * supported tools
45 *
46 * Support? Name
47 * N (code in SoC repo) gain control
48 * Y block switching
49 * Y window shapes - standard
50 * N window shapes - Low Delay
51 * Y filterbank - standard
52 * N (code in SoC repo) filterbank - Scalable Sample Rate
53 * Y Temporal Noise Shaping
54 * Y Long Term Prediction
55 * Y intensity stereo
56 * Y channel coupling
57 * Y frequency domain prediction
58 * Y Perceptual Noise Substitution
59 * Y Mid/Side stereo
60 * N Scalable Inverse AAC Quantization
61 * N Frequency Selective Switch
62 * N upsampling filter
63 * Y quantization & coding - AAC
64 * N quantization & coding - TwinVQ
65 * N quantization & coding - BSAC
66 * N AAC Error Resilience tools
67 * N Error Resilience payload syntax
68 * N Error Protection tool
69 * N CELP
70 * N Silence Compression
71 * N HVXC
72 * N HVXC 4kbits/s VR
73 * N Structured Audio tools
74 * N Structured Audio Sample Bank Format
75 * N MIDI
76 * N Harmonic and Individual Lines plus Noise
77 * N Text-To-Speech Interface
78 * Y Spectral Band Replication
79 * Y (not in this code) Layer-1
80 * Y (not in this code) Layer-2
81 * Y (not in this code) Layer-3
82 * N SinuSoidal Coding (Transient, Sinusoid, Noise)
83 * Y Parametric Stereo
84 * N Direct Stream Transfer
85 * Y (not in fixed point code) Enhanced AAC Low Delay (ER AAC ELD)
86 *
87 * Note: - HE AAC v1 comprises LC AAC with Spectral Band Replication.
88 * - HE AAC v2 comprises LC AAC with Spectral Band Replication and
89 Parametric Stereo.
90 */
91
92 #include "libavutil/channel_layout.h"
93 #include "libavutil/thread.h"
94 #include "internal.h"
95
96 static VLC vlc_scalefactors;
97 static VLC vlc_spectral[11];
98
99 static int output_configure(AACContext *ac,
100 uint8_t layout_map[MAX_ELEM_ID*4][3], int tags,
101 enum OCStatus oc_type, int get_new_frame);
102
103 #define overread_err "Input buffer exhausted before END element found\n"
104
count_channels(uint8_t (layout)[3], int tags)105 static int count_channels(uint8_t (*layout)[3], int tags)
106 {
107 int i, sum = 0;
108 for (i = 0; i < tags; i++) {
109 int syn_ele = layout[i][0];
110 int pos = layout[i][2];
111 sum += (1 + (syn_ele == TYPE_CPE)) *
112 (pos != AAC_CHANNEL_OFF && pos != AAC_CHANNEL_CC);
113 }
114 return sum;
115 }
116
117 /**
118 * Check for the channel element in the current channel position configuration.
119 * If it exists, make sure the appropriate element is allocated and map the
120 * channel order to match the internal FFmpeg channel layout.
121 *
122 * @param che_pos current channel position configuration
123 * @param type channel element type
124 * @param id channel element id
125 * @param channels count of the number of channels in the configuration
126 *
127 * @return Returns error status. 0 - OK, !0 - error
128 */
che_configure(AACContext *ac, enum ChannelPosition che_pos, int type, int id, int *channels)129 static av_cold int che_configure(AACContext *ac,
130 enum ChannelPosition che_pos,
131 int type, int id, int *channels)
132 {
133 if (*channels >= MAX_CHANNELS)
134 return AVERROR_INVALIDDATA;
135 if (che_pos) {
136 if (!ac->che[type][id]) {
137 if (!(ac->che[type][id] = av_mallocz(sizeof(ChannelElement))))
138 return AVERROR(ENOMEM);
139 AAC_RENAME(ff_aac_sbr_ctx_init)(ac, &ac->che[type][id]->sbr, type);
140 }
141 if (type != TYPE_CCE) {
142 if (*channels >= MAX_CHANNELS - (type == TYPE_CPE || (type == TYPE_SCE && ac->oc[1].m4ac.ps == 1))) {
143 av_log(ac->avctx, AV_LOG_ERROR, "Too many channels\n");
144 return AVERROR_INVALIDDATA;
145 }
146 ac->output_element[(*channels)++] = &ac->che[type][id]->ch[0];
147 if (type == TYPE_CPE ||
148 (type == TYPE_SCE && ac->oc[1].m4ac.ps == 1)) {
149 ac->output_element[(*channels)++] = &ac->che[type][id]->ch[1];
150 }
151 }
152 } else {
153 if (ac->che[type][id])
154 AAC_RENAME(ff_aac_sbr_ctx_close)(&ac->che[type][id]->sbr);
155 av_freep(&ac->che[type][id]);
156 }
157 return 0;
158 }
159
frame_configure_elements(AVCodecContext *avctx)160 static int frame_configure_elements(AVCodecContext *avctx)
161 {
162 AACContext *ac = avctx->priv_data;
163 int type, id, ch, ret;
164
165 /* set channel pointers to internal buffers by default */
166 for (type = 0; type < 4; type++) {
167 for (id = 0; id < MAX_ELEM_ID; id++) {
168 ChannelElement *che = ac->che[type][id];
169 if (che) {
170 che->ch[0].ret = che->ch[0].ret_buf;
171 che->ch[1].ret = che->ch[1].ret_buf;
172 }
173 }
174 }
175
176 /* get output buffer */
177 av_frame_unref(ac->frame);
178 if (!avctx->ch_layout.nb_channels)
179 return 1;
180
181 ac->frame->nb_samples = 2048;
182 if ((ret = ff_get_buffer(avctx, ac->frame, 0)) < 0)
183 return ret;
184
185 /* map output channel pointers to AVFrame data */
186 for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
187 if (ac->output_element[ch])
188 ac->output_element[ch]->ret = (INTFLOAT *)ac->frame->extended_data[ch];
189 }
190
191 return 0;
192 }
193
194 struct elem_to_channel {
195 uint64_t av_position;
196 uint8_t syn_ele;
197 uint8_t elem_id;
198 uint8_t aac_position;
199 };
200
assign_pair(struct elem_to_channel e2c_vec[MAX_ELEM_ID], uint8_t (*layout_map)[3], int offset, uint64_t left, uint64_t right, int pos, uint64_t *layout)201 static int assign_pair(struct elem_to_channel e2c_vec[MAX_ELEM_ID],
202 uint8_t (*layout_map)[3], int offset, uint64_t left,
203 uint64_t right, int pos, uint64_t *layout)
204 {
205 if (layout_map[offset][0] == TYPE_CPE) {
206 e2c_vec[offset] = (struct elem_to_channel) {
207 .av_position = left | right,
208 .syn_ele = TYPE_CPE,
209 .elem_id = layout_map[offset][1],
210 .aac_position = pos
211 };
212 if (e2c_vec[offset].av_position != UINT64_MAX)
213 *layout |= e2c_vec[offset].av_position;
214
215 return 1;
216 } else {
217 e2c_vec[offset] = (struct elem_to_channel) {
218 .av_position = left,
219 .syn_ele = TYPE_SCE,
220 .elem_id = layout_map[offset][1],
221 .aac_position = pos
222 };
223 e2c_vec[offset + 1] = (struct elem_to_channel) {
224 .av_position = right,
225 .syn_ele = TYPE_SCE,
226 .elem_id = layout_map[offset + 1][1],
227 .aac_position = pos
228 };
229 if (left != UINT64_MAX)
230 *layout |= left;
231
232 if (right != UINT64_MAX)
233 *layout |= right;
234
235 return 2;
236 }
237 }
238
count_paired_channels(uint8_t (layout_map)[3], int tags, int pos, int *current)239 static int count_paired_channels(uint8_t (*layout_map)[3], int tags, int pos,
240 int *current)
241 {
242 int num_pos_channels = 0;
243 int first_cpe = 0;
244 int sce_parity = 0;
245 int i;
246 for (i = *current; i < tags; i++) {
247 if (layout_map[i][2] != pos)
248 break;
249 if (layout_map[i][0] == TYPE_CPE) {
250 if (sce_parity) {
251 if (pos == AAC_CHANNEL_FRONT && !first_cpe) {
252 sce_parity = 0;
253 } else {
254 return -1;
255 }
256 }
257 num_pos_channels += 2;
258 first_cpe = 1;
259 } else {
260 num_pos_channels++;
261 sce_parity ^= 1;
262 }
263 }
264 if (sce_parity &&
265 ((pos == AAC_CHANNEL_FRONT && first_cpe) || pos == AAC_CHANNEL_SIDE))
266 return -1;
267 *current = i;
268 return num_pos_channels;
269 }
270
271 #define PREFIX_FOR_22POINT2 (AV_CH_LAYOUT_7POINT1_WIDE_BACK|AV_CH_BACK_CENTER|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT|AV_CH_LOW_FREQUENCY_2)
sniff_channel_order(uint8_t (layout_map)[3], int tags)272 static uint64_t sniff_channel_order(uint8_t (*layout_map)[3], int tags)
273 {
274 int i, n, total_non_cc_elements;
275 struct elem_to_channel e2c_vec[4 * MAX_ELEM_ID] = { { 0 } };
276 int num_front_channels, num_side_channels, num_back_channels;
277 uint64_t layout = 0;
278
279 if (FF_ARRAY_ELEMS(e2c_vec) < tags)
280 return 0;
281
282 i = 0;
283 num_front_channels =
284 count_paired_channels(layout_map, tags, AAC_CHANNEL_FRONT, &i);
285 if (num_front_channels < 0)
286 return 0;
287 num_side_channels =
288 count_paired_channels(layout_map, tags, AAC_CHANNEL_SIDE, &i);
289 if (num_side_channels < 0)
290 return 0;
291 num_back_channels =
292 count_paired_channels(layout_map, tags, AAC_CHANNEL_BACK, &i);
293 if (num_back_channels < 0)
294 return 0;
295
296 if (num_side_channels == 0 && num_back_channels >= 4) {
297 num_side_channels = 2;
298 num_back_channels -= 2;
299 }
300
301 i = 0;
302 if (num_front_channels & 1) {
303 e2c_vec[i] = (struct elem_to_channel) {
304 .av_position = AV_CH_FRONT_CENTER,
305 .syn_ele = TYPE_SCE,
306 .elem_id = layout_map[i][1],
307 .aac_position = AAC_CHANNEL_FRONT
308 };
309 layout |= e2c_vec[i].av_position;
310 i++;
311 num_front_channels--;
312 }
313 if (num_front_channels >= 4) {
314 i += assign_pair(e2c_vec, layout_map, i,
315 AV_CH_FRONT_LEFT_OF_CENTER,
316 AV_CH_FRONT_RIGHT_OF_CENTER,
317 AAC_CHANNEL_FRONT, &layout);
318 num_front_channels -= 2;
319 }
320 if (num_front_channels >= 2) {
321 i += assign_pair(e2c_vec, layout_map, i,
322 AV_CH_FRONT_LEFT,
323 AV_CH_FRONT_RIGHT,
324 AAC_CHANNEL_FRONT, &layout);
325 num_front_channels -= 2;
326 }
327 while (num_front_channels >= 2) {
328 i += assign_pair(e2c_vec, layout_map, i,
329 UINT64_MAX,
330 UINT64_MAX,
331 AAC_CHANNEL_FRONT, &layout);
332 num_front_channels -= 2;
333 }
334
335 if (num_side_channels >= 2) {
336 i += assign_pair(e2c_vec, layout_map, i,
337 AV_CH_SIDE_LEFT,
338 AV_CH_SIDE_RIGHT,
339 AAC_CHANNEL_FRONT, &layout);
340 num_side_channels -= 2;
341 }
342 while (num_side_channels >= 2) {
343 i += assign_pair(e2c_vec, layout_map, i,
344 UINT64_MAX,
345 UINT64_MAX,
346 AAC_CHANNEL_SIDE, &layout);
347 num_side_channels -= 2;
348 }
349
350 while (num_back_channels >= 4) {
351 i += assign_pair(e2c_vec, layout_map, i,
352 UINT64_MAX,
353 UINT64_MAX,
354 AAC_CHANNEL_BACK, &layout);
355 num_back_channels -= 2;
356 }
357 if (num_back_channels >= 2) {
358 i += assign_pair(e2c_vec, layout_map, i,
359 AV_CH_BACK_LEFT,
360 AV_CH_BACK_RIGHT,
361 AAC_CHANNEL_BACK, &layout);
362 num_back_channels -= 2;
363 }
364 if (num_back_channels) {
365 e2c_vec[i] = (struct elem_to_channel) {
366 .av_position = AV_CH_BACK_CENTER,
367 .syn_ele = TYPE_SCE,
368 .elem_id = layout_map[i][1],
369 .aac_position = AAC_CHANNEL_BACK
370 };
371 layout |= e2c_vec[i].av_position;
372 i++;
373 num_back_channels--;
374 }
375
376 if (i < tags && layout_map[i][2] == AAC_CHANNEL_LFE) {
377 e2c_vec[i] = (struct elem_to_channel) {
378 .av_position = AV_CH_LOW_FREQUENCY,
379 .syn_ele = TYPE_LFE,
380 .elem_id = layout_map[i][1],
381 .aac_position = AAC_CHANNEL_LFE
382 };
383 layout |= e2c_vec[i].av_position;
384 i++;
385 }
386 if (i < tags && layout_map[i][2] == AAC_CHANNEL_LFE) {
387 e2c_vec[i] = (struct elem_to_channel) {
388 .av_position = AV_CH_LOW_FREQUENCY_2,
389 .syn_ele = TYPE_LFE,
390 .elem_id = layout_map[i][1],
391 .aac_position = AAC_CHANNEL_LFE
392 };
393 layout |= e2c_vec[i].av_position;
394 i++;
395 }
396 while (i < tags && layout_map[i][2] == AAC_CHANNEL_LFE) {
397 e2c_vec[i] = (struct elem_to_channel) {
398 .av_position = UINT64_MAX,
399 .syn_ele = TYPE_LFE,
400 .elem_id = layout_map[i][1],
401 .aac_position = AAC_CHANNEL_LFE
402 };
403 i++;
404 }
405
406 // The previous checks would end up at 8 at this point for 22.2
407 if (layout == PREFIX_FOR_22POINT2 && tags == 16 && i == 8) {
408 const uint8_t (*reference_layout_map)[3] = aac_channel_layout_map[12];
409 for (int j = 0; j < tags; j++) {
410 if (layout_map[j][0] != reference_layout_map[j][0] ||
411 layout_map[j][2] != reference_layout_map[j][2])
412 goto end_of_layout_definition;
413 }
414
415 e2c_vec[i] = (struct elem_to_channel) {
416 .av_position = AV_CH_TOP_FRONT_CENTER,
417 .syn_ele = layout_map[i][0],
418 .elem_id = layout_map[i][1],
419 .aac_position = layout_map[i][2]
420 }; layout |= e2c_vec[i].av_position; i++;
421 i += assign_pair(e2c_vec, layout_map, i,
422 AV_CH_TOP_FRONT_LEFT,
423 AV_CH_TOP_FRONT_RIGHT,
424 AAC_CHANNEL_FRONT,
425 &layout);
426 i += assign_pair(e2c_vec, layout_map, i,
427 AV_CH_TOP_SIDE_LEFT,
428 AV_CH_TOP_SIDE_RIGHT,
429 AAC_CHANNEL_SIDE,
430 &layout);
431 e2c_vec[i] = (struct elem_to_channel) {
432 .av_position = AV_CH_TOP_CENTER,
433 .syn_ele = layout_map[i][0],
434 .elem_id = layout_map[i][1],
435 .aac_position = layout_map[i][2]
436 }; layout |= e2c_vec[i].av_position; i++;
437 i += assign_pair(e2c_vec, layout_map, i,
438 AV_CH_TOP_BACK_LEFT,
439 AV_CH_TOP_BACK_RIGHT,
440 AAC_CHANNEL_BACK,
441 &layout);
442 e2c_vec[i] = (struct elem_to_channel) {
443 .av_position = AV_CH_TOP_BACK_CENTER,
444 .syn_ele = layout_map[i][0],
445 .elem_id = layout_map[i][1],
446 .aac_position = layout_map[i][2]
447 }; layout |= e2c_vec[i].av_position; i++;
448 e2c_vec[i] = (struct elem_to_channel) {
449 .av_position = AV_CH_BOTTOM_FRONT_CENTER,
450 .syn_ele = layout_map[i][0],
451 .elem_id = layout_map[i][1],
452 .aac_position = layout_map[i][2]
453 }; layout |= e2c_vec[i].av_position; i++;
454 i += assign_pair(e2c_vec, layout_map, i,
455 AV_CH_BOTTOM_FRONT_LEFT,
456 AV_CH_BOTTOM_FRONT_RIGHT,
457 AAC_CHANNEL_FRONT,
458 &layout);
459 }
460
461 end_of_layout_definition:
462
463 total_non_cc_elements = n = i;
464
465 if (layout == AV_CH_LAYOUT_22POINT2) {
466 // For 22.2 reorder the result as needed
467 FFSWAP(struct elem_to_channel, e2c_vec[2], e2c_vec[0]); // FL & FR first (final), FC third
468 FFSWAP(struct elem_to_channel, e2c_vec[2], e2c_vec[1]); // FC second (final), FLc & FRc third
469 FFSWAP(struct elem_to_channel, e2c_vec[6], e2c_vec[2]); // LFE1 third (final), FLc & FRc seventh
470 FFSWAP(struct elem_to_channel, e2c_vec[4], e2c_vec[3]); // BL & BR fourth (final), SiL & SiR fifth
471 FFSWAP(struct elem_to_channel, e2c_vec[6], e2c_vec[4]); // FLc & FRc fifth (final), SiL & SiR seventh
472 FFSWAP(struct elem_to_channel, e2c_vec[7], e2c_vec[6]); // LFE2 seventh (final), SiL & SiR eight (final)
473 FFSWAP(struct elem_to_channel, e2c_vec[9], e2c_vec[8]); // TpFL & TpFR ninth (final), TFC tenth (final)
474 FFSWAP(struct elem_to_channel, e2c_vec[11], e2c_vec[10]); // TC eleventh (final), TpSiL & TpSiR twelth
475 FFSWAP(struct elem_to_channel, e2c_vec[12], e2c_vec[11]); // TpBL & TpBR twelth (final), TpSiL & TpSiR thirteenth (final)
476 } else {
477 // For everything else, utilize the AV channel position define as a
478 // stable sort.
479 do {
480 int next_n = 0;
481 for (i = 1; i < n; i++)
482 if (e2c_vec[i - 1].av_position > e2c_vec[i].av_position) {
483 FFSWAP(struct elem_to_channel, e2c_vec[i - 1], e2c_vec[i]);
484 next_n = i;
485 }
486 n = next_n;
487 } while (n > 0);
488
489 }
490
491 for (i = 0; i < total_non_cc_elements; i++) {
492 layout_map[i][0] = e2c_vec[i].syn_ele;
493 layout_map[i][1] = e2c_vec[i].elem_id;
494 layout_map[i][2] = e2c_vec[i].aac_position;
495 }
496
497 return layout;
498 }
499
500 /**
501 * Save current output configuration if and only if it has been locked.
502 */
push_output_configuration(AACContext *ac)503 static int push_output_configuration(AACContext *ac) {
504 int pushed = 0;
505
506 if (ac->oc[1].status == OC_LOCKED || ac->oc[0].status == OC_NONE) {
507 ac->oc[0] = ac->oc[1];
508 pushed = 1;
509 }
510 ac->oc[1].status = OC_NONE;
511 return pushed;
512 }
513
514 /**
515 * Restore the previous output configuration if and only if the current
516 * configuration is unlocked.
517 */
pop_output_configuration(AACContext *ac)518 static void pop_output_configuration(AACContext *ac) {
519 if (ac->oc[1].status != OC_LOCKED && ac->oc[0].status != OC_NONE) {
520 ac->oc[1] = ac->oc[0];
521 ac->avctx->ch_layout = ac->oc[1].ch_layout;
522 output_configure(ac, ac->oc[1].layout_map, ac->oc[1].layout_map_tags,
523 ac->oc[1].status, 0);
524 }
525 }
526
527 /**
528 * Configure output channel order based on the current program
529 * configuration element.
530 *
531 * @return Returns error status. 0 - OK, !0 - error
532 */
output_configure(AACContext *ac, uint8_t layout_map[MAX_ELEM_ID * 4][3], int tags, enum OCStatus oc_type, int get_new_frame)533 static int output_configure(AACContext *ac,
534 uint8_t layout_map[MAX_ELEM_ID * 4][3], int tags,
535 enum OCStatus oc_type, int get_new_frame)
536 {
537 AVCodecContext *avctx = ac->avctx;
538 int i, channels = 0, ret;
539 uint64_t layout = 0;
540 uint8_t id_map[TYPE_END][MAX_ELEM_ID] = {{ 0 }};
541 uint8_t type_counts[TYPE_END] = { 0 };
542
543 if (ac->oc[1].layout_map != layout_map) {
544 memcpy(ac->oc[1].layout_map, layout_map, tags * sizeof(layout_map[0]));
545 ac->oc[1].layout_map_tags = tags;
546 }
547 for (i = 0; i < tags; i++) {
548 int type = layout_map[i][0];
549 int id = layout_map[i][1];
550 id_map[type][id] = type_counts[type]++;
551 if (id_map[type][id] >= MAX_ELEM_ID) {
552 avpriv_request_sample(ac->avctx, "Too large remapped id");
553 return AVERROR_PATCHWELCOME;
554 }
555 }
556 // Try to sniff a reasonable channel order, otherwise output the
557 // channels in the order the PCE declared them.
558 #if FF_API_OLD_CHANNEL_LAYOUT
559 FF_DISABLE_DEPRECATION_WARNINGS
560 if (avctx->request_channel_layout == AV_CH_LAYOUT_NATIVE)
561 ac->output_channel_order = CHANNEL_ORDER_CODED;
562 FF_ENABLE_DEPRECATION_WARNINGS
563 #endif
564
565 if (ac->output_channel_order == CHANNEL_ORDER_DEFAULT)
566 layout = sniff_channel_order(layout_map, tags);
567 for (i = 0; i < tags; i++) {
568 int type = layout_map[i][0];
569 int id = layout_map[i][1];
570 int iid = id_map[type][id];
571 int position = layout_map[i][2];
572 // Allocate or free elements depending on if they are in the
573 // current program configuration.
574 ret = che_configure(ac, position, type, iid, &channels);
575 if (ret < 0)
576 return ret;
577 ac->tag_che_map[type][id] = ac->che[type][iid];
578 }
579 if (ac->oc[1].m4ac.ps == 1 && channels == 2) {
580 if (layout == AV_CH_FRONT_CENTER) {
581 layout = AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT;
582 } else {
583 layout = 0;
584 }
585 }
586
587 av_channel_layout_uninit(&ac->oc[1].ch_layout);
588 if (layout)
589 av_channel_layout_from_mask(&ac->oc[1].ch_layout, layout);
590 else {
591 ac->oc[1].ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
592 ac->oc[1].ch_layout.nb_channels = channels;
593 }
594
595 av_channel_layout_copy(&avctx->ch_layout, &ac->oc[1].ch_layout);
596 ac->oc[1].status = oc_type;
597
598 if (get_new_frame) {
599 if ((ret = frame_configure_elements(ac->avctx)) < 0)
600 return ret;
601 }
602
603 return 0;
604 }
605
flush(AVCodecContext *avctx)606 static void flush(AVCodecContext *avctx)
607 {
608 AACContext *ac= avctx->priv_data;
609 int type, i, j;
610
611 for (type = 3; type >= 0; type--) {
612 for (i = 0; i < MAX_ELEM_ID; i++) {
613 ChannelElement *che = ac->che[type][i];
614 if (che) {
615 for (j = 0; j <= 1; j++) {
616 memset(che->ch[j].saved, 0, sizeof(che->ch[j].saved));
617 }
618 }
619 }
620 }
621 }
622
623 /**
624 * Set up channel positions based on a default channel configuration
625 * as specified in table 1.17.
626 *
627 * @return Returns error status. 0 - OK, !0 - error
628 */
set_default_channel_config(AACContext *ac, AVCodecContext *avctx, uint8_t (*layout_map)[3], int *tags, int channel_config)629 static int set_default_channel_config(AACContext *ac, AVCodecContext *avctx,
630 uint8_t (*layout_map)[3],
631 int *tags,
632 int channel_config)
633 {
634 if (channel_config < 1 || (channel_config > 7 && channel_config < 11) ||
635 channel_config > 13) {
636 av_log(avctx, AV_LOG_ERROR,
637 "invalid default channel configuration (%d)\n",
638 channel_config);
639 return AVERROR_INVALIDDATA;
640 }
641 *tags = tags_per_config[channel_config];
642 memcpy(layout_map, aac_channel_layout_map[channel_config - 1],
643 *tags * sizeof(*layout_map));
644
645 /*
646 * AAC specification has 7.1(wide) as a default layout for 8-channel streams.
647 * However, at least Nero AAC encoder encodes 7.1 streams using the default
648 * channel config 7, mapping the side channels of the original audio stream
649 * to the second AAC_CHANNEL_FRONT pair in the AAC stream. Similarly, e.g. FAAD
650 * decodes the second AAC_CHANNEL_FRONT pair as side channels, therefore decoding
651 * the incorrect streams as if they were correct (and as the encoder intended).
652 *
653 * As actual intended 7.1(wide) streams are very rare, default to assuming a
654 * 7.1 layout was intended.
655 */
656 if (channel_config == 7 && avctx->strict_std_compliance < FF_COMPLIANCE_STRICT) {
657 layout_map[2][2] = AAC_CHANNEL_SIDE;
658
659 if (!ac || !ac->warned_71_wide++) {
660 av_log(avctx, AV_LOG_INFO, "Assuming an incorrectly encoded 7.1 channel layout"
661 " instead of a spec-compliant 7.1(wide) layout, use -strict %d to decode"
662 " according to the specification instead.\n", FF_COMPLIANCE_STRICT);
663 }
664 }
665
666 return 0;
667 }
668
get_che(AACContext *ac, int type, int elem_id)669 static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
670 {
671 /* For PCE based channel configurations map the channels solely based
672 * on tags. */
673 if (!ac->oc[1].m4ac.chan_config) {
674 return ac->tag_che_map[type][elem_id];
675 }
676 // Allow single CPE stereo files to be signalled with mono configuration.
677 if (!ac->tags_mapped && type == TYPE_CPE &&
678 ac->oc[1].m4ac.chan_config == 1) {
679 uint8_t layout_map[MAX_ELEM_ID*4][3];
680 int layout_map_tags;
681 push_output_configuration(ac);
682
683 av_log(ac->avctx, AV_LOG_DEBUG, "mono with CPE\n");
684
685 if (set_default_channel_config(ac, ac->avctx, layout_map,
686 &layout_map_tags, 2) < 0)
687 return NULL;
688 if (output_configure(ac, layout_map, layout_map_tags,
689 OC_TRIAL_FRAME, 1) < 0)
690 return NULL;
691
692 ac->oc[1].m4ac.chan_config = 2;
693 ac->oc[1].m4ac.ps = 0;
694 }
695 // And vice-versa
696 if (!ac->tags_mapped && type == TYPE_SCE &&
697 ac->oc[1].m4ac.chan_config == 2) {
698 uint8_t layout_map[MAX_ELEM_ID * 4][3];
699 int layout_map_tags;
700 push_output_configuration(ac);
701
702 av_log(ac->avctx, AV_LOG_DEBUG, "stereo with SCE\n");
703
704 layout_map_tags = 2;
705 layout_map[0][0] = layout_map[1][0] = TYPE_SCE;
706 layout_map[0][2] = layout_map[1][2] = AAC_CHANNEL_FRONT;
707 layout_map[0][1] = 0;
708 layout_map[1][1] = 1;
709 if (output_configure(ac, layout_map, layout_map_tags,
710 OC_TRIAL_FRAME, 1) < 0)
711 return NULL;
712
713 if (ac->oc[1].m4ac.sbr)
714 ac->oc[1].m4ac.ps = -1;
715 }
716 /* For indexed channel configurations map the channels solely based
717 * on position. */
718 switch (ac->oc[1].m4ac.chan_config) {
719 case 13:
720 if (ac->tags_mapped > 3 && ((type == TYPE_CPE && elem_id < 8) ||
721 (type == TYPE_SCE && elem_id < 6) ||
722 (type == TYPE_LFE && elem_id < 2))) {
723 ac->tags_mapped++;
724 return ac->tag_che_map[type][elem_id] = ac->che[type][elem_id];
725 }
726 case 12:
727 case 7:
728 if (ac->tags_mapped == 3 && type == TYPE_CPE) {
729 ac->tags_mapped++;
730 return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2];
731 }
732 case 11:
733 if (ac->tags_mapped == 3 && type == TYPE_SCE) {
734 ac->tags_mapped++;
735 return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
736 }
737 case 6:
738 /* Some streams incorrectly code 5.1 audio as
739 * SCE[0] CPE[0] CPE[1] SCE[1]
740 * instead of
741 * SCE[0] CPE[0] CPE[1] LFE[0].
742 * If we seem to have encountered such a stream, transfer
743 * the LFE[0] element to the SCE[1]'s mapping */
744 if (ac->tags_mapped == tags_per_config[ac->oc[1].m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) {
745 if (!ac->warned_remapping_once && (type != TYPE_LFE || elem_id != 0)) {
746 av_log(ac->avctx, AV_LOG_WARNING,
747 "This stream seems to incorrectly report its last channel as %s[%d], mapping to LFE[0]\n",
748 type == TYPE_SCE ? "SCE" : "LFE", elem_id);
749 ac->warned_remapping_once++;
750 }
751 ac->tags_mapped++;
752 return ac->tag_che_map[type][elem_id] = ac->che[TYPE_LFE][0];
753 }
754 case 5:
755 if (ac->tags_mapped == 2 && type == TYPE_CPE) {
756 ac->tags_mapped++;
757 return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1];
758 }
759 case 4:
760 /* Some streams incorrectly code 4.0 audio as
761 * SCE[0] CPE[0] LFE[0]
762 * instead of
763 * SCE[0] CPE[0] SCE[1].
764 * If we seem to have encountered such a stream, transfer
765 * the SCE[1] element to the LFE[0]'s mapping */
766 if (ac->tags_mapped == tags_per_config[ac->oc[1].m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) {
767 if (!ac->warned_remapping_once && (type != TYPE_SCE || elem_id != 1)) {
768 av_log(ac->avctx, AV_LOG_WARNING,
769 "This stream seems to incorrectly report its last channel as %s[%d], mapping to SCE[1]\n",
770 type == TYPE_SCE ? "SCE" : "LFE", elem_id);
771 ac->warned_remapping_once++;
772 }
773 ac->tags_mapped++;
774 return ac->tag_che_map[type][elem_id] = ac->che[TYPE_SCE][1];
775 }
776 if (ac->tags_mapped == 2 &&
777 ac->oc[1].m4ac.chan_config == 4 &&
778 type == TYPE_SCE) {
779 ac->tags_mapped++;
780 return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
781 }
782 case 3:
783 case 2:
784 if (ac->tags_mapped == (ac->oc[1].m4ac.chan_config != 2) &&
785 type == TYPE_CPE) {
786 ac->tags_mapped++;
787 return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][0];
788 } else if (ac->tags_mapped == 1 && ac->oc[1].m4ac.chan_config == 2 &&
789 type == TYPE_SCE) {
790 ac->tags_mapped++;
791 return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
792 }
793 case 1:
794 if (!ac->tags_mapped && type == TYPE_SCE) {
795 ac->tags_mapped++;
796 return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][0];
797 }
798 default:
799 return NULL;
800 }
801 }
802
803 /**
804 * Decode an array of 4 bit element IDs, optionally interleaved with a
805 * stereo/mono switching bit.
806 *
807 * @param type speaker type/position for these channels
808 */
decode_channel_map(uint8_t layout_map[][3], enum ChannelPosition type, GetBitContext *gb, int n)809 static void decode_channel_map(uint8_t layout_map[][3],
810 enum ChannelPosition type,
811 GetBitContext *gb, int n)
812 {
813 while (n--) {
814 enum RawDataBlockType syn_ele;
815 switch (type) {
816 case AAC_CHANNEL_FRONT:
817 case AAC_CHANNEL_BACK:
818 case AAC_CHANNEL_SIDE:
819 syn_ele = get_bits1(gb);
820 break;
821 case AAC_CHANNEL_CC:
822 skip_bits1(gb);
823 syn_ele = TYPE_CCE;
824 break;
825 case AAC_CHANNEL_LFE:
826 syn_ele = TYPE_LFE;
827 break;
828 default:
829 // AAC_CHANNEL_OFF has no channel map
830 av_assert0(0);
831 }
832 layout_map[0][0] = syn_ele;
833 layout_map[0][1] = get_bits(gb, 4);
834 layout_map[0][2] = type;
835 layout_map++;
836 }
837 }
838
relative_align_get_bits(GetBitContext *gb, int reference_position)839 static inline void relative_align_get_bits(GetBitContext *gb,
840 int reference_position) {
841 int n = (reference_position - get_bits_count(gb) & 7);
842 if (n)
843 skip_bits(gb, n);
844 }
845
846 /**
847 * Decode program configuration element; reference: table 4.2.
848 *
849 * @return Returns error status. 0 - OK, !0 - error
850 */
decode_pce(AVCodecContext *avctx, MPEG4AudioConfig *m4ac, uint8_t (*layout_map)[3], GetBitContext *gb, int byte_align_ref)851 static int decode_pce(AVCodecContext *avctx, MPEG4AudioConfig *m4ac,
852 uint8_t (*layout_map)[3],
853 GetBitContext *gb, int byte_align_ref)
854 {
855 int num_front, num_side, num_back, num_lfe, num_assoc_data, num_cc;
856 int sampling_index;
857 int comment_len;
858 int tags;
859
860 skip_bits(gb, 2); // object_type
861
862 sampling_index = get_bits(gb, 4);
863 if (m4ac->sampling_index != sampling_index)
864 av_log(avctx, AV_LOG_WARNING,
865 "Sample rate index in program config element does not "
866 "match the sample rate index configured by the container.\n");
867
868 num_front = get_bits(gb, 4);
869 num_side = get_bits(gb, 4);
870 num_back = get_bits(gb, 4);
871 num_lfe = get_bits(gb, 2);
872 num_assoc_data = get_bits(gb, 3);
873 num_cc = get_bits(gb, 4);
874
875 if (get_bits1(gb))
876 skip_bits(gb, 4); // mono_mixdown_tag
877 if (get_bits1(gb))
878 skip_bits(gb, 4); // stereo_mixdown_tag
879
880 if (get_bits1(gb))
881 skip_bits(gb, 3); // mixdown_coeff_index and pseudo_surround
882
883 if (get_bits_left(gb) < 5 * (num_front + num_side + num_back + num_cc) + 4 *(num_lfe + num_assoc_data + num_cc)) {
884 av_log(avctx, AV_LOG_ERROR, "decode_pce: " overread_err);
885 return -1;
886 }
887 decode_channel_map(layout_map , AAC_CHANNEL_FRONT, gb, num_front);
888 tags = num_front;
889 decode_channel_map(layout_map + tags, AAC_CHANNEL_SIDE, gb, num_side);
890 tags += num_side;
891 decode_channel_map(layout_map + tags, AAC_CHANNEL_BACK, gb, num_back);
892 tags += num_back;
893 decode_channel_map(layout_map + tags, AAC_CHANNEL_LFE, gb, num_lfe);
894 tags += num_lfe;
895
896 skip_bits_long(gb, 4 * num_assoc_data);
897
898 decode_channel_map(layout_map + tags, AAC_CHANNEL_CC, gb, num_cc);
899 tags += num_cc;
900
901 relative_align_get_bits(gb, byte_align_ref);
902
903 /* comment field, first byte is length */
904 comment_len = get_bits(gb, 8) * 8;
905 if (get_bits_left(gb) < comment_len) {
906 av_log(avctx, AV_LOG_ERROR, "decode_pce: " overread_err);
907 return AVERROR_INVALIDDATA;
908 }
909 skip_bits_long(gb, comment_len);
910 return tags;
911 }
912
913 /**
914 * Decode GA "General Audio" specific configuration; reference: table 4.1.
915 *
916 * @param ac pointer to AACContext, may be null
917 * @param avctx pointer to AVCCodecContext, used for logging
918 *
919 * @return Returns error status. 0 - OK, !0 - error
920 */
decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx, GetBitContext *gb, int get_bit_alignment, MPEG4AudioConfig *m4ac, int channel_config)921 static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx,
922 GetBitContext *gb,
923 int get_bit_alignment,
924 MPEG4AudioConfig *m4ac,
925 int channel_config)
926 {
927 int extension_flag, ret, ep_config, res_flags;
928 uint8_t layout_map[MAX_ELEM_ID*4][3];
929 int tags = 0;
930
931 #if USE_FIXED
932 if (get_bits1(gb)) { // frameLengthFlag
933 avpriv_report_missing_feature(avctx, "Fixed point 960/120 MDCT window");
934 return AVERROR_PATCHWELCOME;
935 }
936 m4ac->frame_length_short = 0;
937 #else
938 m4ac->frame_length_short = get_bits1(gb);
939 if (m4ac->frame_length_short && m4ac->sbr == 1) {
940 avpriv_report_missing_feature(avctx, "SBR with 960 frame length");
941 if (ac) ac->warned_960_sbr = 1;
942 m4ac->sbr = 0;
943 m4ac->ps = 0;
944 }
945 #endif
946
947 if (get_bits1(gb)) // dependsOnCoreCoder
948 skip_bits(gb, 14); // coreCoderDelay
949 extension_flag = get_bits1(gb);
950
951 if (m4ac->object_type == AOT_AAC_SCALABLE ||
952 m4ac->object_type == AOT_ER_AAC_SCALABLE)
953 skip_bits(gb, 3); // layerNr
954
955 if (channel_config == 0) {
956 skip_bits(gb, 4); // element_instance_tag
957 tags = decode_pce(avctx, m4ac, layout_map, gb, get_bit_alignment);
958 if (tags < 0)
959 return tags;
960 } else {
961 if ((ret = set_default_channel_config(ac, avctx, layout_map,
962 &tags, channel_config)))
963 return ret;
964 }
965
966 if (count_channels(layout_map, tags) > 1) {
967 m4ac->ps = 0;
968 } else if (m4ac->sbr == 1 && m4ac->ps == -1)
969 m4ac->ps = 1;
970
971 if (ac && (ret = output_configure(ac, layout_map, tags, OC_GLOBAL_HDR, 0)))
972 return ret;
973
974 if (extension_flag) {
975 switch (m4ac->object_type) {
976 case AOT_ER_BSAC:
977 skip_bits(gb, 5); // numOfSubFrame
978 skip_bits(gb, 11); // layer_length
979 break;
980 case AOT_ER_AAC_LC:
981 case AOT_ER_AAC_LTP:
982 case AOT_ER_AAC_SCALABLE:
983 case AOT_ER_AAC_LD:
984 res_flags = get_bits(gb, 3);
985 if (res_flags) {
986 avpriv_report_missing_feature(avctx,
987 "AAC data resilience (flags %x)",
988 res_flags);
989 return AVERROR_PATCHWELCOME;
990 }
991 break;
992 }
993 skip_bits1(gb); // extensionFlag3 (TBD in version 3)
994 }
995 switch (m4ac->object_type) {
996 case AOT_ER_AAC_LC:
997 case AOT_ER_AAC_LTP:
998 case AOT_ER_AAC_SCALABLE:
999 case AOT_ER_AAC_LD:
1000 ep_config = get_bits(gb, 2);
1001 if (ep_config) {
1002 avpriv_report_missing_feature(avctx,
1003 "epConfig %d", ep_config);
1004 return AVERROR_PATCHWELCOME;
1005 }
1006 }
1007 return 0;
1008 }
1009
decode_eld_specific_config(AACContext *ac, AVCodecContext *avctx, GetBitContext *gb, MPEG4AudioConfig *m4ac, int channel_config)1010 static int decode_eld_specific_config(AACContext *ac, AVCodecContext *avctx,
1011 GetBitContext *gb,
1012 MPEG4AudioConfig *m4ac,
1013 int channel_config)
1014 {
1015 int ret, ep_config, res_flags;
1016 uint8_t layout_map[MAX_ELEM_ID*4][3];
1017 int tags = 0;
1018 const int ELDEXT_TERM = 0;
1019
1020 m4ac->ps = 0;
1021 m4ac->sbr = 0;
1022 #if USE_FIXED
1023 if (get_bits1(gb)) { // frameLengthFlag
1024 avpriv_request_sample(avctx, "960/120 MDCT window");
1025 return AVERROR_PATCHWELCOME;
1026 }
1027 #else
1028 m4ac->frame_length_short = get_bits1(gb);
1029 #endif
1030 res_flags = get_bits(gb, 3);
1031 if (res_flags) {
1032 avpriv_report_missing_feature(avctx,
1033 "AAC data resilience (flags %x)",
1034 res_flags);
1035 return AVERROR_PATCHWELCOME;
1036 }
1037
1038 if (get_bits1(gb)) { // ldSbrPresentFlag
1039 avpriv_report_missing_feature(avctx,
1040 "Low Delay SBR");
1041 return AVERROR_PATCHWELCOME;
1042 }
1043
1044 while (get_bits(gb, 4) != ELDEXT_TERM) {
1045 int len = get_bits(gb, 4);
1046 if (len == 15)
1047 len += get_bits(gb, 8);
1048 if (len == 15 + 255)
1049 len += get_bits(gb, 16);
1050 if (get_bits_left(gb) < len * 8 + 4) {
1051 av_log(avctx, AV_LOG_ERROR, overread_err);
1052 return AVERROR_INVALIDDATA;
1053 }
1054 skip_bits_long(gb, 8 * len);
1055 }
1056
1057 if ((ret = set_default_channel_config(ac, avctx, layout_map,
1058 &tags, channel_config)))
1059 return ret;
1060
1061 if (ac && (ret = output_configure(ac, layout_map, tags, OC_GLOBAL_HDR, 0)))
1062 return ret;
1063
1064 ep_config = get_bits(gb, 2);
1065 if (ep_config) {
1066 avpriv_report_missing_feature(avctx,
1067 "epConfig %d", ep_config);
1068 return AVERROR_PATCHWELCOME;
1069 }
1070 return 0;
1071 }
1072
1073 /**
1074 * Decode audio specific configuration; reference: table 1.13.
1075 *
1076 * @param ac pointer to AACContext, may be null
1077 * @param avctx pointer to AVCCodecContext, used for logging
1078 * @param m4ac pointer to MPEG4AudioConfig, used for parsing
1079 * @param gb buffer holding an audio specific config
1080 * @param get_bit_alignment relative alignment for byte align operations
1081 * @param sync_extension look for an appended sync extension
1082 *
1083 * @return Returns error status or number of consumed bits. <0 - error
1084 */
decode_audio_specific_config_gb(AACContext *ac, AVCodecContext *avctx, MPEG4AudioConfig *m4ac, GetBitContext *gb, int get_bit_alignment, int sync_extension)1085 static int decode_audio_specific_config_gb(AACContext *ac,
1086 AVCodecContext *avctx,
1087 MPEG4AudioConfig *m4ac,
1088 GetBitContext *gb,
1089 int get_bit_alignment,
1090 int sync_extension)
1091 {
1092 int i, ret;
1093 GetBitContext gbc = *gb;
1094 MPEG4AudioConfig m4ac_bak = *m4ac;
1095
1096 if ((i = ff_mpeg4audio_get_config_gb(m4ac, &gbc, sync_extension, avctx)) < 0) {
1097 *m4ac = m4ac_bak;
1098 return AVERROR_INVALIDDATA;
1099 }
1100
1101 if (m4ac->sampling_index > 12) {
1102 av_log(avctx, AV_LOG_ERROR,
1103 "invalid sampling rate index %d\n",
1104 m4ac->sampling_index);
1105 *m4ac = m4ac_bak;
1106 return AVERROR_INVALIDDATA;
1107 }
1108 if (m4ac->object_type == AOT_ER_AAC_LD &&
1109 (m4ac->sampling_index < 3 || m4ac->sampling_index > 7)) {
1110 av_log(avctx, AV_LOG_ERROR,
1111 "invalid low delay sampling rate index %d\n",
1112 m4ac->sampling_index);
1113 *m4ac = m4ac_bak;
1114 return AVERROR_INVALIDDATA;
1115 }
1116
1117 skip_bits_long(gb, i);
1118
1119 switch (m4ac->object_type) {
1120 case AOT_AAC_MAIN:
1121 case AOT_AAC_LC:
1122 case AOT_AAC_SSR:
1123 case AOT_AAC_LTP:
1124 case AOT_ER_AAC_LC:
1125 case AOT_ER_AAC_LD:
1126 if ((ret = decode_ga_specific_config(ac, avctx, gb, get_bit_alignment,
1127 m4ac, m4ac->chan_config)) < 0)
1128 return ret;
1129 break;
1130 case AOT_ER_AAC_ELD:
1131 if ((ret = decode_eld_specific_config(ac, avctx, gb,
1132 m4ac, m4ac->chan_config)) < 0)
1133 return ret;
1134 break;
1135 default:
1136 avpriv_report_missing_feature(avctx,
1137 "Audio object type %s%d",
1138 m4ac->sbr == 1 ? "SBR+" : "",
1139 m4ac->object_type);
1140 return AVERROR(ENOSYS);
1141 }
1142
1143 ff_dlog(avctx,
1144 "AOT %d chan config %d sampling index %d (%d) SBR %d PS %d\n",
1145 m4ac->object_type, m4ac->chan_config, m4ac->sampling_index,
1146 m4ac->sample_rate, m4ac->sbr,
1147 m4ac->ps);
1148
1149 return get_bits_count(gb);
1150 }
1151
decode_audio_specific_config(AACContext *ac, AVCodecContext *avctx, MPEG4AudioConfig *m4ac, const uint8_t *data, int64_t bit_size, int sync_extension)1152 static int decode_audio_specific_config(AACContext *ac,
1153 AVCodecContext *avctx,
1154 MPEG4AudioConfig *m4ac,
1155 const uint8_t *data, int64_t bit_size,
1156 int sync_extension)
1157 {
1158 int i, ret;
1159 GetBitContext gb;
1160
1161 if (bit_size < 0 || bit_size > INT_MAX) {
1162 av_log(avctx, AV_LOG_ERROR, "Audio specific config size is invalid\n");
1163 return AVERROR_INVALIDDATA;
1164 }
1165
1166 ff_dlog(avctx, "audio specific config size %d\n", (int)bit_size >> 3);
1167 for (i = 0; i < bit_size >> 3; i++)
1168 ff_dlog(avctx, "%02x ", data[i]);
1169 ff_dlog(avctx, "\n");
1170
1171 if ((ret = init_get_bits(&gb, data, bit_size)) < 0)
1172 return ret;
1173
1174 return decode_audio_specific_config_gb(ac, avctx, m4ac, &gb, 0,
1175 sync_extension);
1176 }
1177
1178 /**
1179 * linear congruential pseudorandom number generator
1180 *
1181 * @param previous_val pointer to the current state of the generator
1182 *
1183 * @return Returns a 32-bit pseudorandom integer
1184 */
lcg_random(unsigned previous_val)1185 static av_always_inline int lcg_random(unsigned previous_val)
1186 {
1187 union { unsigned u; int s; } v = { previous_val * 1664525u + 1013904223 };
1188 return v.s;
1189 }
1190
reset_all_predictors(PredictorState *ps)1191 static void reset_all_predictors(PredictorState *ps)
1192 {
1193 int i;
1194 for (i = 0; i < MAX_PREDICTORS; i++)
1195 reset_predict_state(&ps[i]);
1196 }
1197
sample_rate_idx(int rate)1198 static int sample_rate_idx (int rate)
1199 {
1200 if (92017 <= rate) return 0;
1201 else if (75132 <= rate) return 1;
1202 else if (55426 <= rate) return 2;
1203 else if (46009 <= rate) return 3;
1204 else if (37566 <= rate) return 4;
1205 else if (27713 <= rate) return 5;
1206 else if (23004 <= rate) return 6;
1207 else if (18783 <= rate) return 7;
1208 else if (13856 <= rate) return 8;
1209 else if (11502 <= rate) return 9;
1210 else if (9391 <= rate) return 10;
1211 else return 11;
1212 }
1213
reset_predictor_group(PredictorState *ps, int group_num)1214 static void reset_predictor_group(PredictorState *ps, int group_num)
1215 {
1216 int i;
1217 for (i = group_num - 1; i < MAX_PREDICTORS; i += 30)
1218 reset_predict_state(&ps[i]);
1219 }
1220
1221 static void aacdec_init(AACContext *ac);
1222
aac_static_table_init(void)1223 static av_cold void aac_static_table_init(void)
1224 {
1225 static VLCElem vlc_buf[304 + 270 + 550 + 300 + 328 +
1226 294 + 306 + 268 + 510 + 366 + 462];
1227 for (unsigned i = 0, offset = 0; i < 11; i++) {
1228 vlc_spectral[i].table = &vlc_buf[offset];
1229 vlc_spectral[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
1230 ff_init_vlc_sparse(&vlc_spectral[i], 8, ff_aac_spectral_sizes[i],
1231 ff_aac_spectral_bits[i], sizeof(ff_aac_spectral_bits[i][0]),
1232 sizeof(ff_aac_spectral_bits[i][0]),
1233 ff_aac_spectral_codes[i], sizeof(ff_aac_spectral_codes[i][0]),
1234 sizeof(ff_aac_spectral_codes[i][0]),
1235 ff_aac_codebook_vector_idx[i], sizeof(ff_aac_codebook_vector_idx[i][0]),
1236 sizeof(ff_aac_codebook_vector_idx[i][0]),
1237 INIT_VLC_STATIC_OVERLONG);
1238 offset += vlc_spectral[i].table_size;
1239 }
1240
1241 AAC_RENAME(ff_aac_sbr_init)();
1242
1243 ff_aac_tableinit();
1244
1245 INIT_VLC_STATIC(&vlc_scalefactors, 7,
1246 FF_ARRAY_ELEMS(ff_aac_scalefactor_code),
1247 ff_aac_scalefactor_bits,
1248 sizeof(ff_aac_scalefactor_bits[0]),
1249 sizeof(ff_aac_scalefactor_bits[0]),
1250 ff_aac_scalefactor_code,
1251 sizeof(ff_aac_scalefactor_code[0]),
1252 sizeof(ff_aac_scalefactor_code[0]),
1253 352);
1254
1255 // window initialization
1256 #if !USE_FIXED
1257 AAC_RENAME(ff_kbd_window_init)(AAC_RENAME(aac_kbd_long_960), 4.0, 960);
1258 AAC_RENAME(ff_kbd_window_init)(AAC_RENAME(aac_kbd_short_120), 6.0, 120);
1259 AAC_RENAME(ff_sine_window_init)(AAC_RENAME(sine_960), 960);
1260 AAC_RENAME(ff_sine_window_init)(AAC_RENAME(sine_120), 120);
1261 AAC_RENAME(ff_init_ff_sine_windows)(9);
1262 ff_aac_float_common_init();
1263 #else
1264 AAC_RENAME(ff_kbd_window_init)(AAC_RENAME2(aac_kbd_long_1024), 4.0, 1024);
1265 AAC_RENAME(ff_kbd_window_init)(AAC_RENAME2(aac_kbd_short_128), 6.0, 128);
1266 init_sine_windows_fixed();
1267 #endif
1268
1269 AAC_RENAME(ff_cbrt_tableinit)();
1270 }
1271
1272 static AVOnce aac_table_init = AV_ONCE_INIT;
1273
aac_decode_init(AVCodecContext *avctx)1274 static av_cold int aac_decode_init(AVCodecContext *avctx)
1275 {
1276 AACContext *ac = avctx->priv_data;
1277 int ret;
1278
1279 if (avctx->sample_rate > 96000)
1280 return AVERROR_INVALIDDATA;
1281
1282 ret = ff_thread_once(&aac_table_init, &aac_static_table_init);
1283 if (ret != 0)
1284 return AVERROR_UNKNOWN;
1285
1286 ac->avctx = avctx;
1287 ac->oc[1].m4ac.sample_rate = avctx->sample_rate;
1288
1289 aacdec_init(ac);
1290 #if USE_FIXED
1291 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
1292 #else
1293 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1294 #endif /* USE_FIXED */
1295
1296 if (avctx->extradata_size > 0) {
1297 if ((ret = decode_audio_specific_config(ac, ac->avctx, &ac->oc[1].m4ac,
1298 avctx->extradata,
1299 avctx->extradata_size * 8LL,
1300 1)) < 0)
1301 return ret;
1302 } else {
1303 int sr, i;
1304 uint8_t layout_map[MAX_ELEM_ID*4][3];
1305 int layout_map_tags;
1306
1307 sr = sample_rate_idx(avctx->sample_rate);
1308 ac->oc[1].m4ac.sampling_index = sr;
1309 ac->oc[1].m4ac.channels = avctx->ch_layout.nb_channels;
1310 ac->oc[1].m4ac.sbr = -1;
1311 ac->oc[1].m4ac.ps = -1;
1312
1313 for (i = 0; i < FF_ARRAY_ELEMS(ff_mpeg4audio_channels); i++)
1314 if (ff_mpeg4audio_channels[i] == avctx->ch_layout.nb_channels)
1315 break;
1316 if (i == FF_ARRAY_ELEMS(ff_mpeg4audio_channels)) {
1317 i = 0;
1318 }
1319 ac->oc[1].m4ac.chan_config = i;
1320
1321 if (ac->oc[1].m4ac.chan_config) {
1322 int ret = set_default_channel_config(ac, avctx, layout_map,
1323 &layout_map_tags, ac->oc[1].m4ac.chan_config);
1324 if (!ret)
1325 output_configure(ac, layout_map, layout_map_tags,
1326 OC_GLOBAL_HDR, 0);
1327 else if (avctx->err_recognition & AV_EF_EXPLODE)
1328 return AVERROR_INVALIDDATA;
1329 }
1330 }
1331
1332 if (avctx->ch_layout.nb_channels > MAX_CHANNELS) {
1333 av_log(avctx, AV_LOG_ERROR, "Too many channels\n");
1334 return AVERROR_INVALIDDATA;
1335 }
1336
1337 #if USE_FIXED
1338 ac->fdsp = avpriv_alloc_fixed_dsp(avctx->flags & AV_CODEC_FLAG_BITEXACT);
1339 #else
1340 ac->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
1341 #endif /* USE_FIXED */
1342 if (!ac->fdsp) {
1343 return AVERROR(ENOMEM);
1344 }
1345
1346 ac->random_state = 0x1f2e3d4c;
1347
1348 AAC_RENAME_32(ff_mdct_init)(&ac->mdct, 11, 1, 1.0 / RANGE15(1024.0));
1349 AAC_RENAME_32(ff_mdct_init)(&ac->mdct_ld, 10, 1, 1.0 / RANGE15(512.0));
1350 AAC_RENAME_32(ff_mdct_init)(&ac->mdct_small, 8, 1, 1.0 / RANGE15(128.0));
1351 AAC_RENAME_32(ff_mdct_init)(&ac->mdct_ltp, 11, 0, RANGE15(-2.0));
1352 #if !USE_FIXED
1353 ret = ff_mdct15_init(&ac->mdct120, 1, 3, 1.0f/(16*1024*120*2));
1354 if (ret < 0)
1355 return ret;
1356 ret = ff_mdct15_init(&ac->mdct480, 1, 5, 1.0f/(16*1024*960));
1357 if (ret < 0)
1358 return ret;
1359 ret = ff_mdct15_init(&ac->mdct960, 1, 6, 1.0f/(16*1024*960*2));
1360 if (ret < 0)
1361 return ret;
1362 #endif
1363
1364 return 0;
1365 }
1366
1367 /**
1368 * Skip data_stream_element; reference: table 4.10.
1369 */
skip_data_stream_element(AACContext *ac, GetBitContext *gb)1370 static int skip_data_stream_element(AACContext *ac, GetBitContext *gb)
1371 {
1372 int byte_align = get_bits1(gb);
1373 int count = get_bits(gb, 8);
1374 if (count == 255)
1375 count += get_bits(gb, 8);
1376 if (byte_align)
1377 align_get_bits(gb);
1378
1379 if (get_bits_left(gb) < 8 * count) {
1380 av_log(ac->avctx, AV_LOG_ERROR, "skip_data_stream_element: "overread_err);
1381 return AVERROR_INVALIDDATA;
1382 }
1383 skip_bits_long(gb, 8 * count);
1384 return 0;
1385 }
1386
decode_prediction(AACContext *ac, IndividualChannelStream *ics, GetBitContext *gb)1387 static int decode_prediction(AACContext *ac, IndividualChannelStream *ics,
1388 GetBitContext *gb)
1389 {
1390 int sfb;
1391 if (get_bits1(gb)) {
1392 ics->predictor_reset_group = get_bits(gb, 5);
1393 if (ics->predictor_reset_group == 0 ||
1394 ics->predictor_reset_group > 30) {
1395 av_log(ac->avctx, AV_LOG_ERROR,
1396 "Invalid Predictor Reset Group.\n");
1397 return AVERROR_INVALIDDATA;
1398 }
1399 }
1400 for (sfb = 0; sfb < FFMIN(ics->max_sfb, ff_aac_pred_sfb_max[ac->oc[1].m4ac.sampling_index]); sfb++) {
1401 ics->prediction_used[sfb] = get_bits1(gb);
1402 }
1403 return 0;
1404 }
1405
1406 /**
1407 * Decode Long Term Prediction data; reference: table 4.xx.
1408 */
decode_ltp(LongTermPrediction *ltp, GetBitContext *gb, uint8_t max_sfb)1409 static void decode_ltp(LongTermPrediction *ltp,
1410 GetBitContext *gb, uint8_t max_sfb)
1411 {
1412 int sfb;
1413
1414 ltp->lag = get_bits(gb, 11);
1415 ltp->coef = ltp_coef[get_bits(gb, 3)];
1416 for (sfb = 0; sfb < FFMIN(max_sfb, MAX_LTP_LONG_SFB); sfb++)
1417 ltp->used[sfb] = get_bits1(gb);
1418 }
1419
1420 /**
1421 * Decode Individual Channel Stream info; reference: table 4.6.
1422 */
decode_ics_info(AACContext *ac, IndividualChannelStream *ics, GetBitContext *gb)1423 static int decode_ics_info(AACContext *ac, IndividualChannelStream *ics,
1424 GetBitContext *gb)
1425 {
1426 const MPEG4AudioConfig *const m4ac = &ac->oc[1].m4ac;
1427 const int aot = m4ac->object_type;
1428 const int sampling_index = m4ac->sampling_index;
1429 int ret_fail = AVERROR_INVALIDDATA;
1430
1431 if (aot != AOT_ER_AAC_ELD) {
1432 if (get_bits1(gb)) {
1433 av_log(ac->avctx, AV_LOG_ERROR, "Reserved bit set.\n");
1434 if (ac->avctx->err_recognition & AV_EF_BITSTREAM)
1435 return AVERROR_INVALIDDATA;
1436 }
1437 ics->window_sequence[1] = ics->window_sequence[0];
1438 ics->window_sequence[0] = get_bits(gb, 2);
1439 if (aot == AOT_ER_AAC_LD &&
1440 ics->window_sequence[0] != ONLY_LONG_SEQUENCE) {
1441 av_log(ac->avctx, AV_LOG_ERROR,
1442 "AAC LD is only defined for ONLY_LONG_SEQUENCE but "
1443 "window sequence %d found.\n", ics->window_sequence[0]);
1444 ics->window_sequence[0] = ONLY_LONG_SEQUENCE;
1445 return AVERROR_INVALIDDATA;
1446 }
1447 ics->use_kb_window[1] = ics->use_kb_window[0];
1448 ics->use_kb_window[0] = get_bits1(gb);
1449 }
1450 ics->num_window_groups = 1;
1451 ics->group_len[0] = 1;
1452 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1453 int i;
1454 ics->max_sfb = get_bits(gb, 4);
1455 for (i = 0; i < 7; i++) {
1456 if (get_bits1(gb)) {
1457 ics->group_len[ics->num_window_groups - 1]++;
1458 } else {
1459 ics->num_window_groups++;
1460 ics->group_len[ics->num_window_groups - 1] = 1;
1461 }
1462 }
1463 ics->num_windows = 8;
1464 if (m4ac->frame_length_short) {
1465 ics->swb_offset = ff_swb_offset_120[sampling_index];
1466 ics->num_swb = ff_aac_num_swb_120[sampling_index];
1467 } else {
1468 ics->swb_offset = ff_swb_offset_128[sampling_index];
1469 ics->num_swb = ff_aac_num_swb_128[sampling_index];
1470 }
1471 ics->tns_max_bands = ff_tns_max_bands_128[sampling_index];
1472 ics->predictor_present = 0;
1473 } else {
1474 ics->max_sfb = get_bits(gb, 6);
1475 ics->num_windows = 1;
1476 if (aot == AOT_ER_AAC_LD || aot == AOT_ER_AAC_ELD) {
1477 if (m4ac->frame_length_short) {
1478 ics->swb_offset = ff_swb_offset_480[sampling_index];
1479 ics->num_swb = ff_aac_num_swb_480[sampling_index];
1480 ics->tns_max_bands = ff_tns_max_bands_480[sampling_index];
1481 } else {
1482 ics->swb_offset = ff_swb_offset_512[sampling_index];
1483 ics->num_swb = ff_aac_num_swb_512[sampling_index];
1484 ics->tns_max_bands = ff_tns_max_bands_512[sampling_index];
1485 }
1486 if (!ics->num_swb || !ics->swb_offset) {
1487 ret_fail = AVERROR_BUG;
1488 goto fail;
1489 }
1490 } else {
1491 if (m4ac->frame_length_short) {
1492 ics->num_swb = ff_aac_num_swb_960[sampling_index];
1493 ics->swb_offset = ff_swb_offset_960[sampling_index];
1494 } else {
1495 ics->num_swb = ff_aac_num_swb_1024[sampling_index];
1496 ics->swb_offset = ff_swb_offset_1024[sampling_index];
1497 }
1498 ics->tns_max_bands = ff_tns_max_bands_1024[sampling_index];
1499 }
1500 if (aot != AOT_ER_AAC_ELD) {
1501 ics->predictor_present = get_bits1(gb);
1502 ics->predictor_reset_group = 0;
1503 }
1504 if (ics->predictor_present) {
1505 if (aot == AOT_AAC_MAIN) {
1506 if (decode_prediction(ac, ics, gb)) {
1507 goto fail;
1508 }
1509 } else if (aot == AOT_AAC_LC ||
1510 aot == AOT_ER_AAC_LC) {
1511 av_log(ac->avctx, AV_LOG_ERROR,
1512 "Prediction is not allowed in AAC-LC.\n");
1513 goto fail;
1514 } else {
1515 if (aot == AOT_ER_AAC_LD) {
1516 av_log(ac->avctx, AV_LOG_ERROR,
1517 "LTP in ER AAC LD not yet implemented.\n");
1518 ret_fail = AVERROR_PATCHWELCOME;
1519 goto fail;
1520 }
1521 if ((ics->ltp.present = get_bits(gb, 1)))
1522 decode_ltp(&ics->ltp, gb, ics->max_sfb);
1523 }
1524 }
1525 }
1526
1527 if (ics->max_sfb > ics->num_swb) {
1528 av_log(ac->avctx, AV_LOG_ERROR,
1529 "Number of scalefactor bands in group (%d) "
1530 "exceeds limit (%d).\n",
1531 ics->max_sfb, ics->num_swb);
1532 goto fail;
1533 }
1534
1535 return 0;
1536 fail:
1537 ics->max_sfb = 0;
1538 return ret_fail;
1539 }
1540
1541 /**
1542 * Decode band types (section_data payload); reference: table 4.46.
1543 *
1544 * @param band_type array of the used band type
1545 * @param band_type_run_end array of the last scalefactor band of a band type run
1546 *
1547 * @return Returns error status. 0 - OK, !0 - error
1548 */
decode_band_types(AACContext *ac, enum BandType band_type[120], int band_type_run_end[120], GetBitContext *gb, IndividualChannelStream *ics)1549 static int decode_band_types(AACContext *ac, enum BandType band_type[120],
1550 int band_type_run_end[120], GetBitContext *gb,
1551 IndividualChannelStream *ics)
1552 {
1553 int g, idx = 0;
1554 const int bits = (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) ? 3 : 5;
1555 for (g = 0; g < ics->num_window_groups; g++) {
1556 int k = 0;
1557 while (k < ics->max_sfb) {
1558 uint8_t sect_end = k;
1559 int sect_len_incr;
1560 int sect_band_type = get_bits(gb, 4);
1561 if (sect_band_type == 12) {
1562 av_log(ac->avctx, AV_LOG_ERROR, "invalid band type\n");
1563 return AVERROR_INVALIDDATA;
1564 }
1565 do {
1566 sect_len_incr = get_bits(gb, bits);
1567 sect_end += sect_len_incr;
1568 if (get_bits_left(gb) < 0) {
1569 av_log(ac->avctx, AV_LOG_ERROR, "decode_band_types: "overread_err);
1570 return AVERROR_INVALIDDATA;
1571 }
1572 if (sect_end > ics->max_sfb) {
1573 av_log(ac->avctx, AV_LOG_ERROR,
1574 "Number of bands (%d) exceeds limit (%d).\n",
1575 sect_end, ics->max_sfb);
1576 return AVERROR_INVALIDDATA;
1577 }
1578 } while (sect_len_incr == (1 << bits) - 1);
1579 for (; k < sect_end; k++) {
1580 band_type [idx] = sect_band_type;
1581 band_type_run_end[idx++] = sect_end;
1582 }
1583 }
1584 }
1585 return 0;
1586 }
1587
1588 /**
1589 * Decode scalefactors; reference: table 4.47.
1590 *
1591 * @param global_gain first scalefactor value as scalefactors are differentially coded
1592 * @param band_type array of the used band type
1593 * @param band_type_run_end array of the last scalefactor band of a band type run
1594 * @param sf array of scalefactors or intensity stereo positions
1595 *
1596 * @return Returns error status. 0 - OK, !0 - error
1597 */
decode_scalefactors(AACContext *ac, INTFLOAT sf[120], GetBitContext *gb, unsigned int global_gain, IndividualChannelStream *ics, enum BandType band_type[120], int band_type_run_end[120])1598 static int decode_scalefactors(AACContext *ac, INTFLOAT sf[120], GetBitContext *gb,
1599 unsigned int global_gain,
1600 IndividualChannelStream *ics,
1601 enum BandType band_type[120],
1602 int band_type_run_end[120])
1603 {
1604 int g, i, idx = 0;
1605 int offset[3] = { global_gain, global_gain - NOISE_OFFSET, 0 };
1606 int clipped_offset;
1607 int noise_flag = 1;
1608 for (g = 0; g < ics->num_window_groups; g++) {
1609 for (i = 0; i < ics->max_sfb;) {
1610 int run_end = band_type_run_end[idx];
1611 if (band_type[idx] == ZERO_BT) {
1612 for (; i < run_end; i++, idx++)
1613 sf[idx] = FIXR(0.);
1614 } else if ((band_type[idx] == INTENSITY_BT) ||
1615 (band_type[idx] == INTENSITY_BT2)) {
1616 for (; i < run_end; i++, idx++) {
1617 offset[2] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - SCALE_DIFF_ZERO;
1618 clipped_offset = av_clip(offset[2], -155, 100);
1619 if (offset[2] != clipped_offset) {
1620 avpriv_request_sample(ac->avctx,
1621 "If you heard an audible artifact, there may be a bug in the decoder. "
1622 "Clipped intensity stereo position (%d -> %d)",
1623 offset[2], clipped_offset);
1624 }
1625 #if USE_FIXED
1626 sf[idx] = 100 - clipped_offset;
1627 #else
1628 sf[idx] = ff_aac_pow2sf_tab[-clipped_offset + POW_SF2_ZERO];
1629 #endif /* USE_FIXED */
1630 }
1631 } else if (band_type[idx] == NOISE_BT) {
1632 for (; i < run_end; i++, idx++) {
1633 if (noise_flag-- > 0)
1634 offset[1] += get_bits(gb, NOISE_PRE_BITS) - NOISE_PRE;
1635 else
1636 offset[1] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - SCALE_DIFF_ZERO;
1637 clipped_offset = av_clip(offset[1], -100, 155);
1638 if (offset[1] != clipped_offset) {
1639 avpriv_request_sample(ac->avctx,
1640 "If you heard an audible artifact, there may be a bug in the decoder. "
1641 "Clipped noise gain (%d -> %d)",
1642 offset[1], clipped_offset);
1643 }
1644 #if USE_FIXED
1645 sf[idx] = -(100 + clipped_offset);
1646 #else
1647 sf[idx] = -ff_aac_pow2sf_tab[clipped_offset + POW_SF2_ZERO];
1648 #endif /* USE_FIXED */
1649 }
1650 } else {
1651 for (; i < run_end; i++, idx++) {
1652 offset[0] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - SCALE_DIFF_ZERO;
1653 if (offset[0] > 255U) {
1654 av_log(ac->avctx, AV_LOG_ERROR,
1655 "Scalefactor (%d) out of range.\n", offset[0]);
1656 return AVERROR_INVALIDDATA;
1657 }
1658 #if USE_FIXED
1659 sf[idx] = -offset[0];
1660 #else
1661 sf[idx] = -ff_aac_pow2sf_tab[offset[0] - 100 + POW_SF2_ZERO];
1662 #endif /* USE_FIXED */
1663 }
1664 }
1665 }
1666 }
1667 return 0;
1668 }
1669
1670 /**
1671 * Decode pulse data; reference: table 4.7.
1672 */
decode_pulses(Pulse *pulse, GetBitContext *gb, const uint16_t *swb_offset, int num_swb)1673 static int decode_pulses(Pulse *pulse, GetBitContext *gb,
1674 const uint16_t *swb_offset, int num_swb)
1675 {
1676 int i, pulse_swb;
1677 pulse->num_pulse = get_bits(gb, 2) + 1;
1678 pulse_swb = get_bits(gb, 6);
1679 if (pulse_swb >= num_swb)
1680 return -1;
1681 pulse->pos[0] = swb_offset[pulse_swb];
1682 pulse->pos[0] += get_bits(gb, 5);
1683 if (pulse->pos[0] >= swb_offset[num_swb])
1684 return -1;
1685 pulse->amp[0] = get_bits(gb, 4);
1686 for (i = 1; i < pulse->num_pulse; i++) {
1687 pulse->pos[i] = get_bits(gb, 5) + pulse->pos[i - 1];
1688 if (pulse->pos[i] >= swb_offset[num_swb])
1689 return -1;
1690 pulse->amp[i] = get_bits(gb, 4);
1691 }
1692 return 0;
1693 }
1694
1695 /**
1696 * Decode Temporal Noise Shaping data; reference: table 4.48.
1697 *
1698 * @return Returns error status. 0 - OK, !0 - error
1699 */
decode_tns(AACContext *ac, TemporalNoiseShaping *tns, GetBitContext *gb, const IndividualChannelStream *ics)1700 static int decode_tns(AACContext *ac, TemporalNoiseShaping *tns,
1701 GetBitContext *gb, const IndividualChannelStream *ics)
1702 {
1703 int w, filt, i, coef_len, coef_res, coef_compress;
1704 const int is8 = ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE;
1705 const int tns_max_order = is8 ? 7 : ac->oc[1].m4ac.object_type == AOT_AAC_MAIN ? 20 : 12;
1706 for (w = 0; w < ics->num_windows; w++) {
1707 if ((tns->n_filt[w] = get_bits(gb, 2 - is8))) {
1708 coef_res = get_bits1(gb);
1709
1710 for (filt = 0; filt < tns->n_filt[w]; filt++) {
1711 int tmp2_idx;
1712 tns->length[w][filt] = get_bits(gb, 6 - 2 * is8);
1713
1714 if ((tns->order[w][filt] = get_bits(gb, 5 - 2 * is8)) > tns_max_order) {
1715 av_log(ac->avctx, AV_LOG_ERROR,
1716 "TNS filter order %d is greater than maximum %d.\n",
1717 tns->order[w][filt], tns_max_order);
1718 tns->order[w][filt] = 0;
1719 return AVERROR_INVALIDDATA;
1720 }
1721 if (tns->order[w][filt]) {
1722 tns->direction[w][filt] = get_bits1(gb);
1723 coef_compress = get_bits1(gb);
1724 coef_len = coef_res + 3 - coef_compress;
1725 tmp2_idx = 2 * coef_compress + coef_res;
1726
1727 for (i = 0; i < tns->order[w][filt]; i++)
1728 tns->coef[w][filt][i] = tns_tmp2_map[tmp2_idx][get_bits(gb, coef_len)];
1729 }
1730 }
1731 }
1732 }
1733 return 0;
1734 }
1735
1736 /**
1737 * Decode Mid/Side data; reference: table 4.54.
1738 *
1739 * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
1740 * [1] mask is decoded from bitstream; [2] mask is all 1s;
1741 * [3] reserved for scalable AAC
1742 */
decode_mid_side_stereo(ChannelElement *cpe, GetBitContext *gb, int ms_present)1743 static void decode_mid_side_stereo(ChannelElement *cpe, GetBitContext *gb,
1744 int ms_present)
1745 {
1746 int idx;
1747 int max_idx = cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb;
1748 if (ms_present == 1) {
1749 for (idx = 0; idx < max_idx; idx++)
1750 cpe->ms_mask[idx] = get_bits1(gb);
1751 } else if (ms_present == 2) {
1752 memset(cpe->ms_mask, 1, max_idx * sizeof(cpe->ms_mask[0]));
1753 }
1754 }
1755
1756 /**
1757 * Decode spectral data; reference: table 4.50.
1758 * Dequantize and scale spectral data; reference: 4.6.3.3.
1759 *
1760 * @param coef array of dequantized, scaled spectral data
1761 * @param sf array of scalefactors or intensity stereo positions
1762 * @param pulse_present set if pulses are present
1763 * @param pulse pointer to pulse data struct
1764 * @param band_type array of the used band type
1765 *
1766 * @return Returns error status. 0 - OK, !0 - error
1767 */
decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], GetBitContext *gb, const INTFLOAT sf[120], int pulse_present, const Pulse *pulse, const IndividualChannelStream *ics, enum BandType band_type[120])1768 static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024],
1769 GetBitContext *gb, const INTFLOAT sf[120],
1770 int pulse_present, const Pulse *pulse,
1771 const IndividualChannelStream *ics,
1772 enum BandType band_type[120])
1773 {
1774 int i, k, g, idx = 0;
1775 const int c = 1024 / ics->num_windows;
1776 const uint16_t *offsets = ics->swb_offset;
1777 INTFLOAT *coef_base = coef;
1778
1779 for (g = 0; g < ics->num_windows; g++)
1780 memset(coef + g * 128 + offsets[ics->max_sfb], 0,
1781 sizeof(INTFLOAT) * (c - offsets[ics->max_sfb]));
1782
1783 for (g = 0; g < ics->num_window_groups; g++) {
1784 unsigned g_len = ics->group_len[g];
1785
1786 for (i = 0; i < ics->max_sfb; i++, idx++) {
1787 const unsigned cbt_m1 = band_type[idx] - 1;
1788 INTFLOAT *cfo = coef + offsets[i];
1789 int off_len = offsets[i + 1] - offsets[i];
1790 int group;
1791
1792 if (cbt_m1 >= INTENSITY_BT2 - 1) {
1793 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1794 memset(cfo, 0, off_len * sizeof(*cfo));
1795 }
1796 } else if (cbt_m1 == NOISE_BT - 1) {
1797 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1798 INTFLOAT band_energy;
1799 #if USE_FIXED
1800 for (k = 0; k < off_len; k++) {
1801 ac->random_state = lcg_random(ac->random_state);
1802 cfo[k] = ac->random_state >> 3;
1803 }
1804
1805 band_energy = ac->fdsp->scalarproduct_fixed(cfo, cfo, off_len);
1806 band_energy = fixed_sqrt(band_energy, 31);
1807 noise_scale(cfo, sf[idx], band_energy, off_len);
1808 #else
1809 float scale;
1810
1811 for (k = 0; k < off_len; k++) {
1812 ac->random_state = lcg_random(ac->random_state);
1813 cfo[k] = ac->random_state;
1814 }
1815
1816 band_energy = ac->fdsp->scalarproduct_float(cfo, cfo, off_len);
1817 scale = sf[idx] / sqrtf(band_energy);
1818 ac->fdsp->vector_fmul_scalar(cfo, cfo, scale, off_len);
1819 #endif /* USE_FIXED */
1820 }
1821 } else {
1822 #if !USE_FIXED
1823 const float *vq = ff_aac_codebook_vector_vals[cbt_m1];
1824 #endif /* !USE_FIXED */
1825 const VLCElem *vlc_tab = vlc_spectral[cbt_m1].table;
1826 OPEN_READER(re, gb);
1827
1828 switch (cbt_m1 >> 1) {
1829 case 0:
1830 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1831 INTFLOAT *cf = cfo;
1832 int len = off_len;
1833
1834 do {
1835 int code;
1836 unsigned cb_idx;
1837
1838 UPDATE_CACHE(re, gb);
1839 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1840 cb_idx = code;
1841 #if USE_FIXED
1842 cf = DEC_SQUAD(cf, cb_idx);
1843 #else
1844 cf = VMUL4(cf, vq, cb_idx, sf + idx);
1845 #endif /* USE_FIXED */
1846 } while (len -= 4);
1847 }
1848 break;
1849
1850 case 1:
1851 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1852 INTFLOAT *cf = cfo;
1853 int len = off_len;
1854
1855 do {
1856 int code;
1857 unsigned nnz;
1858 unsigned cb_idx;
1859 uint32_t bits;
1860
1861 UPDATE_CACHE(re, gb);
1862 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1863 cb_idx = code;
1864 nnz = cb_idx >> 8 & 15;
1865 bits = nnz ? GET_CACHE(re, gb) : 0;
1866 LAST_SKIP_BITS(re, gb, nnz);
1867 #if USE_FIXED
1868 cf = DEC_UQUAD(cf, cb_idx, bits);
1869 #else
1870 cf = VMUL4S(cf, vq, cb_idx, bits, sf + idx);
1871 #endif /* USE_FIXED */
1872 } while (len -= 4);
1873 }
1874 break;
1875
1876 case 2:
1877 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1878 INTFLOAT *cf = cfo;
1879 int len = off_len;
1880
1881 do {
1882 int code;
1883 unsigned cb_idx;
1884
1885 UPDATE_CACHE(re, gb);
1886 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1887 cb_idx = code;
1888 #if USE_FIXED
1889 cf = DEC_SPAIR(cf, cb_idx);
1890 #else
1891 cf = VMUL2(cf, vq, cb_idx, sf + idx);
1892 #endif /* USE_FIXED */
1893 } while (len -= 2);
1894 }
1895 break;
1896
1897 case 3:
1898 case 4:
1899 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1900 INTFLOAT *cf = cfo;
1901 int len = off_len;
1902
1903 do {
1904 int code;
1905 unsigned nnz;
1906 unsigned cb_idx;
1907 unsigned sign;
1908
1909 UPDATE_CACHE(re, gb);
1910 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1911 cb_idx = code;
1912 nnz = cb_idx >> 8 & 15;
1913 sign = nnz ? SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12) : 0;
1914 LAST_SKIP_BITS(re, gb, nnz);
1915 #if USE_FIXED
1916 cf = DEC_UPAIR(cf, cb_idx, sign);
1917 #else
1918 cf = VMUL2S(cf, vq, cb_idx, sign, sf + idx);
1919 #endif /* USE_FIXED */
1920 } while (len -= 2);
1921 }
1922 break;
1923
1924 default:
1925 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
1926 #if USE_FIXED
1927 int *icf = cfo;
1928 int v;
1929 #else
1930 float *cf = cfo;
1931 uint32_t *icf = (uint32_t *) cf;
1932 #endif /* USE_FIXED */
1933 int len = off_len;
1934
1935 do {
1936 int code;
1937 unsigned nzt, nnz;
1938 unsigned cb_idx;
1939 uint32_t bits;
1940 int j;
1941
1942 UPDATE_CACHE(re, gb);
1943 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1944 cb_idx = code;
1945
1946 if (cb_idx == 0x0000) {
1947 *icf++ = 0;
1948 *icf++ = 0;
1949 continue;
1950 }
1951
1952 nnz = cb_idx >> 12;
1953 nzt = cb_idx >> 8;
1954 bits = SHOW_UBITS(re, gb, nnz) << (32-nnz);
1955 LAST_SKIP_BITS(re, gb, nnz);
1956
1957 for (j = 0; j < 2; j++) {
1958 if (nzt & 1<<j) {
1959 uint32_t b;
1960 int n;
1961 /* The total length of escape_sequence must be < 22 bits according
1962 to the specification (i.e. max is 111111110xxxxxxxxxxxx). */
1963 UPDATE_CACHE(re, gb);
1964 b = GET_CACHE(re, gb);
1965 b = 31 - av_log2(~b);
1966
1967 if (b > 8) {
1968 av_log(ac->avctx, AV_LOG_ERROR, "error in spectral data, ESC overflow\n");
1969 return AVERROR_INVALIDDATA;
1970 }
1971
1972 SKIP_BITS(re, gb, b + 1);
1973 b += 4;
1974 n = (1 << b) + SHOW_UBITS(re, gb, b);
1975 LAST_SKIP_BITS(re, gb, b);
1976 #if USE_FIXED
1977 v = n;
1978 if (bits & 1U<<31)
1979 v = -v;
1980 *icf++ = v;
1981 #else
1982 *icf++ = ff_cbrt_tab[n] | (bits & 1U<<31);
1983 #endif /* USE_FIXED */
1984 bits <<= 1;
1985 } else {
1986 #if USE_FIXED
1987 v = cb_idx & 15;
1988 if (bits & 1U<<31)
1989 v = -v;
1990 *icf++ = v;
1991 #else
1992 unsigned v = ((const uint32_t*)vq)[cb_idx & 15];
1993 *icf++ = (bits & 1U<<31) | v;
1994 #endif /* USE_FIXED */
1995 bits <<= !!v;
1996 }
1997 cb_idx >>= 4;
1998 }
1999 } while (len -= 2);
2000 #if !USE_FIXED
2001 ac->fdsp->vector_fmul_scalar(cfo, cfo, sf[idx], off_len);
2002 #endif /* !USE_FIXED */
2003 }
2004 }
2005
2006 CLOSE_READER(re, gb);
2007 }
2008 }
2009 coef += g_len << 7;
2010 }
2011
2012 if (pulse_present) {
2013 idx = 0;
2014 for (i = 0; i < pulse->num_pulse; i++) {
2015 INTFLOAT co = coef_base[ pulse->pos[i] ];
2016 while (offsets[idx + 1] <= pulse->pos[i])
2017 idx++;
2018 if (band_type[idx] != NOISE_BT && sf[idx]) {
2019 INTFLOAT ico = -pulse->amp[i];
2020 #if USE_FIXED
2021 if (co) {
2022 ico = co + (co > 0 ? -ico : ico);
2023 }
2024 coef_base[ pulse->pos[i] ] = ico;
2025 #else
2026 if (co) {
2027 co /= sf[idx];
2028 ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico);
2029 }
2030 coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx];
2031 #endif /* USE_FIXED */
2032 }
2033 }
2034 }
2035 #if USE_FIXED
2036 coef = coef_base;
2037 idx = 0;
2038 for (g = 0; g < ics->num_window_groups; g++) {
2039 unsigned g_len = ics->group_len[g];
2040
2041 for (i = 0; i < ics->max_sfb; i++, idx++) {
2042 const unsigned cbt_m1 = band_type[idx] - 1;
2043 int *cfo = coef + offsets[i];
2044 int off_len = offsets[i + 1] - offsets[i];
2045 int group;
2046
2047 if (cbt_m1 < NOISE_BT - 1) {
2048 for (group = 0; group < (int)g_len; group++, cfo+=128) {
2049 ac->vector_pow43(cfo, off_len);
2050 ac->subband_scale(cfo, cfo, sf[idx], 34, off_len, ac->avctx);
2051 }
2052 }
2053 }
2054 coef += g_len << 7;
2055 }
2056 #endif /* USE_FIXED */
2057 return 0;
2058 }
2059
2060 /**
2061 * Apply AAC-Main style frequency domain prediction.
2062 */
apply_prediction(AACContext *ac, SingleChannelElement *sce)2063 static void apply_prediction(AACContext *ac, SingleChannelElement *sce)
2064 {
2065 int sfb, k;
2066
2067 if (!sce->ics.predictor_initialized) {
2068 reset_all_predictors(sce->predictor_state);
2069 sce->ics.predictor_initialized = 1;
2070 }
2071
2072 if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
2073 for (sfb = 0;
2074 sfb < ff_aac_pred_sfb_max[ac->oc[1].m4ac.sampling_index];
2075 sfb++) {
2076 for (k = sce->ics.swb_offset[sfb];
2077 k < sce->ics.swb_offset[sfb + 1];
2078 k++) {
2079 predict(&sce->predictor_state[k], &sce->coeffs[k],
2080 sce->ics.predictor_present &&
2081 sce->ics.prediction_used[sfb]);
2082 }
2083 }
2084 if (sce->ics.predictor_reset_group)
2085 reset_predictor_group(sce->predictor_state,
2086 sce->ics.predictor_reset_group);
2087 } else
2088 reset_all_predictors(sce->predictor_state);
2089 }
2090
decode_gain_control(SingleChannelElement * sce, GetBitContext * gb)2091 static void decode_gain_control(SingleChannelElement * sce, GetBitContext * gb)
2092 {
2093 // wd_num, wd_test, aloc_size
2094 static const uint8_t gain_mode[4][3] = {
2095 {1, 0, 5}, // ONLY_LONG_SEQUENCE = 0,
2096 {2, 1, 2}, // LONG_START_SEQUENCE,
2097 {8, 0, 2}, // EIGHT_SHORT_SEQUENCE,
2098 {2, 1, 5}, // LONG_STOP_SEQUENCE
2099 };
2100
2101 const int mode = sce->ics.window_sequence[0];
2102 uint8_t bd, wd, ad;
2103
2104 // FIXME: Store the gain control data on |sce| and do something with it.
2105 uint8_t max_band = get_bits(gb, 2);
2106 for (bd = 0; bd < max_band; bd++) {
2107 for (wd = 0; wd < gain_mode[mode][0]; wd++) {
2108 uint8_t adjust_num = get_bits(gb, 3);
2109 for (ad = 0; ad < adjust_num; ad++) {
2110 skip_bits(gb, 4 + ((wd == 0 && gain_mode[mode][1])
2111 ? 4
2112 : gain_mode[mode][2]));
2113 }
2114 }
2115 }
2116 }
2117
2118 /**
2119 * Decode an individual_channel_stream payload; reference: table 4.44.
2120 *
2121 * @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
2122 * @param scale_flag scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.)
2123 *
2124 * @return Returns error status. 0 - OK, !0 - error
2125 */
decode_ics(AACContext *ac, SingleChannelElement *sce, GetBitContext *gb, int common_window, int scale_flag)2126 static int decode_ics(AACContext *ac, SingleChannelElement *sce,
2127 GetBitContext *gb, int common_window, int scale_flag)
2128 {
2129 Pulse pulse;
2130 TemporalNoiseShaping *tns = &sce->tns;
2131 IndividualChannelStream *ics = &sce->ics;
2132 INTFLOAT *out = sce->coeffs;
2133 int global_gain, eld_syntax, er_syntax, pulse_present = 0;
2134 int ret;
2135
2136 eld_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_ELD;
2137 er_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_LC ||
2138 ac->oc[1].m4ac.object_type == AOT_ER_AAC_LTP ||
2139 ac->oc[1].m4ac.object_type == AOT_ER_AAC_LD ||
2140 ac->oc[1].m4ac.object_type == AOT_ER_AAC_ELD;
2141
2142 /* This assignment is to silence a GCC warning about the variable being used
2143 * uninitialized when in fact it always is.
2144 */
2145 pulse.num_pulse = 0;
2146
2147 global_gain = get_bits(gb, 8);
2148
2149 if (!common_window && !scale_flag) {
2150 ret = decode_ics_info(ac, ics, gb);
2151 if (ret < 0)
2152 goto fail;
2153 }
2154
2155 if ((ret = decode_band_types(ac, sce->band_type,
2156 sce->band_type_run_end, gb, ics)) < 0)
2157 goto fail;
2158 if ((ret = decode_scalefactors(ac, sce->sf, gb, global_gain, ics,
2159 sce->band_type, sce->band_type_run_end)) < 0)
2160 goto fail;
2161
2162 pulse_present = 0;
2163 if (!scale_flag) {
2164 if (!eld_syntax && (pulse_present = get_bits1(gb))) {
2165 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2166 av_log(ac->avctx, AV_LOG_ERROR,
2167 "Pulse tool not allowed in eight short sequence.\n");
2168 ret = AVERROR_INVALIDDATA;
2169 goto fail;
2170 }
2171 if (decode_pulses(&pulse, gb, ics->swb_offset, ics->num_swb)) {
2172 av_log(ac->avctx, AV_LOG_ERROR,
2173 "Pulse data corrupt or invalid.\n");
2174 ret = AVERROR_INVALIDDATA;
2175 goto fail;
2176 }
2177 }
2178 tns->present = get_bits1(gb);
2179 if (tns->present && !er_syntax) {
2180 ret = decode_tns(ac, tns, gb, ics);
2181 if (ret < 0)
2182 goto fail;
2183 }
2184 if (!eld_syntax && get_bits1(gb)) {
2185 decode_gain_control(sce, gb);
2186 if (!ac->warned_gain_control) {
2187 avpriv_report_missing_feature(ac->avctx, "Gain control");
2188 ac->warned_gain_control = 1;
2189 }
2190 }
2191 // I see no textual basis in the spec for this occurring after SSR gain
2192 // control, but this is what both reference and real implmentations do
2193 if (tns->present && er_syntax) {
2194 ret = decode_tns(ac, tns, gb, ics);
2195 if (ret < 0)
2196 goto fail;
2197 }
2198 }
2199
2200 ret = decode_spectrum_and_dequant(ac, out, gb, sce->sf, pulse_present,
2201 &pulse, ics, sce->band_type);
2202 if (ret < 0)
2203 goto fail;
2204
2205 if (ac->oc[1].m4ac.object_type == AOT_AAC_MAIN && !common_window)
2206 apply_prediction(ac, sce);
2207
2208 return 0;
2209 fail:
2210 tns->present = 0;
2211 return ret;
2212 }
2213
2214 /**
2215 * Mid/Side stereo decoding; reference: 4.6.8.1.3.
2216 */
apply_mid_side_stereo(AACContext *ac, ChannelElement *cpe)2217 static void apply_mid_side_stereo(AACContext *ac, ChannelElement *cpe)
2218 {
2219 const IndividualChannelStream *ics = &cpe->ch[0].ics;
2220 INTFLOAT *ch0 = cpe->ch[0].coeffs;
2221 INTFLOAT *ch1 = cpe->ch[1].coeffs;
2222 int g, i, group, idx = 0;
2223 const uint16_t *offsets = ics->swb_offset;
2224 for (g = 0; g < ics->num_window_groups; g++) {
2225 for (i = 0; i < ics->max_sfb; i++, idx++) {
2226 if (cpe->ms_mask[idx] &&
2227 cpe->ch[0].band_type[idx] < NOISE_BT &&
2228 cpe->ch[1].band_type[idx] < NOISE_BT) {
2229 #if USE_FIXED
2230 for (group = 0; group < ics->group_len[g]; group++) {
2231 ac->fdsp->butterflies_fixed(ch0 + group * 128 + offsets[i],
2232 ch1 + group * 128 + offsets[i],
2233 offsets[i+1] - offsets[i]);
2234 #else
2235 for (group = 0; group < ics->group_len[g]; group++) {
2236 ac->fdsp->butterflies_float(ch0 + group * 128 + offsets[i],
2237 ch1 + group * 128 + offsets[i],
2238 offsets[i+1] - offsets[i]);
2239 #endif /* USE_FIXED */
2240 }
2241 }
2242 }
2243 ch0 += ics->group_len[g] * 128;
2244 ch1 += ics->group_len[g] * 128;
2245 }
2246 }
2247
2248 /**
2249 * intensity stereo decoding; reference: 4.6.8.2.3
2250 *
2251 * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
2252 * [1] mask is decoded from bitstream; [2] mask is all 1s;
2253 * [3] reserved for scalable AAC
2254 */
2255 static void apply_intensity_stereo(AACContext *ac,
2256 ChannelElement *cpe, int ms_present)
2257 {
2258 const IndividualChannelStream *ics = &cpe->ch[1].ics;
2259 SingleChannelElement *sce1 = &cpe->ch[1];
2260 INTFLOAT *coef0 = cpe->ch[0].coeffs, *coef1 = cpe->ch[1].coeffs;
2261 const uint16_t *offsets = ics->swb_offset;
2262 int g, group, i, idx = 0;
2263 int c;
2264 INTFLOAT scale;
2265 for (g = 0; g < ics->num_window_groups; g++) {
2266 for (i = 0; i < ics->max_sfb;) {
2267 if (sce1->band_type[idx] == INTENSITY_BT ||
2268 sce1->band_type[idx] == INTENSITY_BT2) {
2269 const int bt_run_end = sce1->band_type_run_end[idx];
2270 for (; i < bt_run_end; i++, idx++) {
2271 c = -1 + 2 * (sce1->band_type[idx] - 14);
2272 if (ms_present)
2273 c *= 1 - 2 * cpe->ms_mask[idx];
2274 scale = c * sce1->sf[idx];
2275 for (group = 0; group < ics->group_len[g]; group++)
2276 #if USE_FIXED
2277 ac->subband_scale(coef1 + group * 128 + offsets[i],
2278 coef0 + group * 128 + offsets[i],
2279 scale,
2280 23,
2281 offsets[i + 1] - offsets[i] ,ac->avctx);
2282 #else
2283 ac->fdsp->vector_fmul_scalar(coef1 + group * 128 + offsets[i],
2284 coef0 + group * 128 + offsets[i],
2285 scale,
2286 offsets[i + 1] - offsets[i]);
2287 #endif /* USE_FIXED */
2288 }
2289 } else {
2290 int bt_run_end = sce1->band_type_run_end[idx];
2291 idx += bt_run_end - i;
2292 i = bt_run_end;
2293 }
2294 }
2295 coef0 += ics->group_len[g] * 128;
2296 coef1 += ics->group_len[g] * 128;
2297 }
2298 }
2299
2300 /**
2301 * Decode a channel_pair_element; reference: table 4.4.
2302 *
2303 * @return Returns error status. 0 - OK, !0 - error
2304 */
2305 static int decode_cpe(AACContext *ac, GetBitContext *gb, ChannelElement *cpe)
2306 {
2307 int i, ret, common_window, ms_present = 0;
2308 int eld_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_ELD;
2309
2310 common_window = eld_syntax || get_bits1(gb);
2311 if (common_window) {
2312 if (decode_ics_info(ac, &cpe->ch[0].ics, gb))
2313 return AVERROR_INVALIDDATA;
2314 i = cpe->ch[1].ics.use_kb_window[0];
2315 cpe->ch[1].ics = cpe->ch[0].ics;
2316 cpe->ch[1].ics.use_kb_window[1] = i;
2317 if (cpe->ch[1].ics.predictor_present &&
2318 (ac->oc[1].m4ac.object_type != AOT_AAC_MAIN))
2319 if ((cpe->ch[1].ics.ltp.present = get_bits(gb, 1)))
2320 decode_ltp(&cpe->ch[1].ics.ltp, gb, cpe->ch[1].ics.max_sfb);
2321 ms_present = get_bits(gb, 2);
2322 if (ms_present == 3) {
2323 av_log(ac->avctx, AV_LOG_ERROR, "ms_present = 3 is reserved.\n");
2324 return AVERROR_INVALIDDATA;
2325 } else if (ms_present)
2326 decode_mid_side_stereo(cpe, gb, ms_present);
2327 }
2328 if ((ret = decode_ics(ac, &cpe->ch[0], gb, common_window, 0)))
2329 return ret;
2330 if ((ret = decode_ics(ac, &cpe->ch[1], gb, common_window, 0)))
2331 return ret;
2332
2333 if (common_window) {
2334 if (ms_present)
2335 apply_mid_side_stereo(ac, cpe);
2336 if (ac->oc[1].m4ac.object_type == AOT_AAC_MAIN) {
2337 apply_prediction(ac, &cpe->ch[0]);
2338 apply_prediction(ac, &cpe->ch[1]);
2339 }
2340 }
2341
2342 apply_intensity_stereo(ac, cpe, ms_present);
2343 return 0;
2344 }
2345
2346 static const float cce_scale[] = {
2347 1.09050773266525765921, //2^(1/8)
2348 1.18920711500272106672, //2^(1/4)
2349 M_SQRT2,
2350 2,
2351 };
2352
2353 /**
2354 * Decode coupling_channel_element; reference: table 4.8.
2355 *
2356 * @return Returns error status. 0 - OK, !0 - error
2357 */
2358 static int decode_cce(AACContext *ac, GetBitContext *gb, ChannelElement *che)
2359 {
2360 int num_gain = 0;
2361 int c, g, sfb, ret;
2362 int sign;
2363 INTFLOAT scale;
2364 SingleChannelElement *sce = &che->ch[0];
2365 ChannelCoupling *coup = &che->coup;
2366
2367 coup->coupling_point = 2 * get_bits1(gb);
2368 coup->num_coupled = get_bits(gb, 3);
2369 for (c = 0; c <= coup->num_coupled; c++) {
2370 num_gain++;
2371 coup->type[c] = get_bits1(gb) ? TYPE_CPE : TYPE_SCE;
2372 coup->id_select[c] = get_bits(gb, 4);
2373 if (coup->type[c] == TYPE_CPE) {
2374 coup->ch_select[c] = get_bits(gb, 2);
2375 if (coup->ch_select[c] == 3)
2376 num_gain++;
2377 } else
2378 coup->ch_select[c] = 2;
2379 }
2380 coup->coupling_point += get_bits1(gb) || (coup->coupling_point >> 1);
2381
2382 sign = get_bits(gb, 1);
2383 #if USE_FIXED
2384 scale = get_bits(gb, 2);
2385 #else
2386 scale = cce_scale[get_bits(gb, 2)];
2387 #endif
2388
2389 if ((ret = decode_ics(ac, sce, gb, 0, 0)))
2390 return ret;
2391
2392 for (c = 0; c < num_gain; c++) {
2393 int idx = 0;
2394 int cge = 1;
2395 int gain = 0;
2396 INTFLOAT gain_cache = FIXR10(1.);
2397 if (c) {
2398 cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb);
2399 gain = cge ? get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60: 0;
2400 gain_cache = GET_GAIN(scale, gain);
2401 #if USE_FIXED
2402 if ((abs(gain_cache)-1024) >> 3 > 30)
2403 return AVERROR(ERANGE);
2404 #endif
2405 }
2406 if (coup->coupling_point == AFTER_IMDCT) {
2407 coup->gain[c][0] = gain_cache;
2408 } else {
2409 for (g = 0; g < sce->ics.num_window_groups; g++) {
2410 for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) {
2411 if (sce->band_type[idx] != ZERO_BT) {
2412 if (!cge) {
2413 int t = get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
2414 if (t) {
2415 int s = 1;
2416 t = gain += t;
2417 if (sign) {
2418 s -= 2 * (t & 0x1);
2419 t >>= 1;
2420 }
2421 gain_cache = GET_GAIN(scale, t) * s;
2422 #if USE_FIXED
2423 if ((abs(gain_cache)-1024) >> 3 > 30)
2424 return AVERROR(ERANGE);
2425 #endif
2426 }
2427 }
2428 coup->gain[c][idx] = gain_cache;
2429 }
2430 }
2431 }
2432 }
2433 }
2434 return 0;
2435 }
2436
2437 /**
2438 * Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
2439 *
2440 * @return Returns number of bytes consumed.
2441 */
2442 static int decode_drc_channel_exclusions(DynamicRangeControl *che_drc,
2443 GetBitContext *gb)
2444 {
2445 int i;
2446 int num_excl_chan = 0;
2447
2448 do {
2449 for (i = 0; i < 7; i++)
2450 che_drc->exclude_mask[num_excl_chan++] = get_bits1(gb);
2451 } while (num_excl_chan < MAX_CHANNELS - 7 && get_bits1(gb));
2452
2453 return num_excl_chan / 7;
2454 }
2455
2456 /**
2457 * Decode dynamic range information; reference: table 4.52.
2458 *
2459 * @return Returns number of bytes consumed.
2460 */
2461 static int decode_dynamic_range(DynamicRangeControl *che_drc,
2462 GetBitContext *gb)
2463 {
2464 int n = 1;
2465 int drc_num_bands = 1;
2466 int i;
2467
2468 /* pce_tag_present? */
2469 if (get_bits1(gb)) {
2470 che_drc->pce_instance_tag = get_bits(gb, 4);
2471 skip_bits(gb, 4); // tag_reserved_bits
2472 n++;
2473 }
2474
2475 /* excluded_chns_present? */
2476 if (get_bits1(gb)) {
2477 n += decode_drc_channel_exclusions(che_drc, gb);
2478 }
2479
2480 /* drc_bands_present? */
2481 if (get_bits1(gb)) {
2482 che_drc->band_incr = get_bits(gb, 4);
2483 che_drc->interpolation_scheme = get_bits(gb, 4);
2484 n++;
2485 drc_num_bands += che_drc->band_incr;
2486 for (i = 0; i < drc_num_bands; i++) {
2487 che_drc->band_top[i] = get_bits(gb, 8);
2488 n++;
2489 }
2490 }
2491
2492 /* prog_ref_level_present? */
2493 if (get_bits1(gb)) {
2494 che_drc->prog_ref_level = get_bits(gb, 7);
2495 skip_bits1(gb); // prog_ref_level_reserved_bits
2496 n++;
2497 }
2498
2499 for (i = 0; i < drc_num_bands; i++) {
2500 che_drc->dyn_rng_sgn[i] = get_bits1(gb);
2501 che_drc->dyn_rng_ctl[i] = get_bits(gb, 7);
2502 n++;
2503 }
2504
2505 return n;
2506 }
2507
2508 static int decode_fill(AACContext *ac, GetBitContext *gb, int len) {
2509 uint8_t buf[256];
2510 int i, major, minor;
2511
2512 if (len < 13+7*8)
2513 goto unknown;
2514
2515 get_bits(gb, 13); len -= 13;
2516
2517 for(i=0; i+1<sizeof(buf) && len>=8; i++, len-=8)
2518 buf[i] = get_bits(gb, 8);
2519
2520 buf[i] = 0;
2521 if (ac->avctx->debug & FF_DEBUG_PICT_INFO)
2522 av_log(ac->avctx, AV_LOG_DEBUG, "FILL:%s\n", buf);
2523
2524 if (sscanf(buf, "libfaac %d.%d", &major, &minor) == 2){
2525 ac->avctx->internal->skip_samples = 1024;
2526 }
2527
2528 unknown:
2529 skip_bits_long(gb, len);
2530
2531 return 0;
2532 }
2533
2534 /**
2535 * Decode extension data (incomplete); reference: table 4.51.
2536 *
2537 * @param cnt length of TYPE_FIL syntactic element in bytes
2538 *
2539 * @return Returns number of bytes consumed
2540 */
2541 static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt,
2542 ChannelElement *che, enum RawDataBlockType elem_type)
2543 {
2544 int crc_flag = 0;
2545 int res = cnt;
2546 int type = get_bits(gb, 4);
2547
2548 if (ac->avctx->debug & FF_DEBUG_STARTCODE)
2549 av_log(ac->avctx, AV_LOG_DEBUG, "extension type: %d len:%d\n", type, cnt);
2550
2551 switch (type) { // extension type
2552 case EXT_SBR_DATA_CRC:
2553 crc_flag++;
2554 case EXT_SBR_DATA:
2555 if (!che) {
2556 av_log(ac->avctx, AV_LOG_ERROR, "SBR was found before the first channel element.\n");
2557 return res;
2558 } else if (ac->oc[1].m4ac.frame_length_short) {
2559 if (!ac->warned_960_sbr)
2560 avpriv_report_missing_feature(ac->avctx,
2561 "SBR with 960 frame length");
2562 ac->warned_960_sbr = 1;
2563 skip_bits_long(gb, 8 * cnt - 4);
2564 return res;
2565 } else if (!ac->oc[1].m4ac.sbr) {
2566 av_log(ac->avctx, AV_LOG_ERROR, "SBR signaled to be not-present but was found in the bitstream.\n");
2567 skip_bits_long(gb, 8 * cnt - 4);
2568 return res;
2569 } else if (ac->oc[1].m4ac.sbr == -1 && ac->oc[1].status == OC_LOCKED) {
2570 av_log(ac->avctx, AV_LOG_ERROR, "Implicit SBR was found with a first occurrence after the first frame.\n");
2571 skip_bits_long(gb, 8 * cnt - 4);
2572 return res;
2573 } else if (ac->oc[1].m4ac.ps == -1 && ac->oc[1].status < OC_LOCKED &&
2574 ac->avctx->ch_layout.nb_channels == 1) {
2575 ac->oc[1].m4ac.sbr = 1;
2576 ac->oc[1].m4ac.ps = 1;
2577 ac->avctx->profile = FF_PROFILE_AAC_HE_V2;
2578 output_configure(ac, ac->oc[1].layout_map, ac->oc[1].layout_map_tags,
2579 ac->oc[1].status, 1);
2580 } else {
2581 ac->oc[1].m4ac.sbr = 1;
2582 ac->avctx->profile = FF_PROFILE_AAC_HE;
2583 }
2584 res = AAC_RENAME(ff_decode_sbr_extension)(ac, &che->sbr, gb, crc_flag, cnt, elem_type);
2585 break;
2586 case EXT_DYNAMIC_RANGE:
2587 res = decode_dynamic_range(&ac->che_drc, gb);
2588 break;
2589 case EXT_FILL:
2590 decode_fill(ac, gb, 8 * cnt - 4);
2591 break;
2592 case EXT_FILL_DATA:
2593 case EXT_DATA_ELEMENT:
2594 default:
2595 skip_bits_long(gb, 8 * cnt - 4);
2596 break;
2597 };
2598 return res;
2599 }
2600
2601 /**
2602 * Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
2603 *
2604 * @param decode 1 if tool is used normally, 0 if tool is used in LTP.
2605 * @param coef spectral coefficients
2606 */
2607 static void apply_tns(INTFLOAT coef_param[1024], TemporalNoiseShaping *tns,
2608 IndividualChannelStream *ics, int decode)
2609 {
2610 const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
2611 int w, filt, m, i;
2612 int bottom, top, order, start, end, size, inc;
2613 INTFLOAT lpc[TNS_MAX_ORDER];
2614 INTFLOAT tmp[TNS_MAX_ORDER+1];
2615 UINTFLOAT *coef = coef_param;
2616
2617 if(!mmm)
2618 return;
2619
2620 for (w = 0; w < ics->num_windows; w++) {
2621 bottom = ics->num_swb;
2622 for (filt = 0; filt < tns->n_filt[w]; filt++) {
2623 top = bottom;
2624 bottom = FFMAX(0, top - tns->length[w][filt]);
2625 order = tns->order[w][filt];
2626 if (order == 0)
2627 continue;
2628
2629 // tns_decode_coef
2630 AAC_RENAME(compute_lpc_coefs)(tns->coef[w][filt], order, lpc, 0, 0, 0);
2631
2632 start = ics->swb_offset[FFMIN(bottom, mmm)];
2633 end = ics->swb_offset[FFMIN( top, mmm)];
2634 if ((size = end - start) <= 0)
2635 continue;
2636 if (tns->direction[w][filt]) {
2637 inc = -1;
2638 start = end - 1;
2639 } else {
2640 inc = 1;
2641 }
2642 start += w * 128;
2643
2644 if (decode) {
2645 // ar filter
2646 for (m = 0; m < size; m++, start += inc)
2647 for (i = 1; i <= FFMIN(m, order); i++)
2648 coef[start] -= AAC_MUL26((INTFLOAT)coef[start - i * inc], lpc[i - 1]);
2649 } else {
2650 // ma filter
2651 for (m = 0; m < size; m++, start += inc) {
2652 tmp[0] = coef[start];
2653 for (i = 1; i <= FFMIN(m, order); i++)
2654 coef[start] += AAC_MUL26(tmp[i], lpc[i - 1]);
2655 for (i = order; i > 0; i--)
2656 tmp[i] = tmp[i - 1];
2657 }
2658 }
2659 }
2660 }
2661 }
2662
2663 /**
2664 * Apply windowing and MDCT to obtain the spectral
2665 * coefficient from the predicted sample by LTP.
2666 */
2667 static void windowing_and_mdct_ltp(AACContext *ac, INTFLOAT *out,
2668 INTFLOAT *in, IndividualChannelStream *ics)
2669 {
2670 const INTFLOAT *lwindow = ics->use_kb_window[0] ? AAC_RENAME2(aac_kbd_long_1024) : AAC_RENAME2(sine_1024);
2671 const INTFLOAT *swindow = ics->use_kb_window[0] ? AAC_RENAME2(aac_kbd_short_128) : AAC_RENAME2(sine_128);
2672 const INTFLOAT *lwindow_prev = ics->use_kb_window[1] ? AAC_RENAME2(aac_kbd_long_1024) : AAC_RENAME2(sine_1024);
2673 const INTFLOAT *swindow_prev = ics->use_kb_window[1] ? AAC_RENAME2(aac_kbd_short_128) : AAC_RENAME2(sine_128);
2674
2675 if (ics->window_sequence[0] != LONG_STOP_SEQUENCE) {
2676 ac->fdsp->vector_fmul(in, in, lwindow_prev, 1024);
2677 } else {
2678 memset(in, 0, 448 * sizeof(*in));
2679 ac->fdsp->vector_fmul(in + 448, in + 448, swindow_prev, 128);
2680 }
2681 if (ics->window_sequence[0] != LONG_START_SEQUENCE) {
2682 ac->fdsp->vector_fmul_reverse(in + 1024, in + 1024, lwindow, 1024);
2683 } else {
2684 ac->fdsp->vector_fmul_reverse(in + 1024 + 448, in + 1024 + 448, swindow, 128);
2685 memset(in + 1024 + 576, 0, 448 * sizeof(*in));
2686 }
2687 ac->mdct_ltp.mdct_calc(&ac->mdct_ltp, out, in);
2688 }
2689
2690 /**
2691 * Apply the long term prediction
2692 */
2693 static void apply_ltp(AACContext *ac, SingleChannelElement *sce)
2694 {
2695 const LongTermPrediction *ltp = &sce->ics.ltp;
2696 const uint16_t *offsets = sce->ics.swb_offset;
2697 int i, sfb;
2698
2699 if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
2700 INTFLOAT *predTime = sce->ret;
2701 INTFLOAT *predFreq = ac->buf_mdct;
2702 int16_t num_samples = 2048;
2703
2704 if (ltp->lag < 1024)
2705 num_samples = ltp->lag + 1024;
2706 for (i = 0; i < num_samples; i++)
2707 predTime[i] = AAC_MUL30(sce->ltp_state[i + 2048 - ltp->lag], ltp->coef);
2708 memset(&predTime[i], 0, (2048 - i) * sizeof(*predTime));
2709
2710 ac->windowing_and_mdct_ltp(ac, predFreq, predTime, &sce->ics);
2711
2712 if (sce->tns.present)
2713 ac->apply_tns(predFreq, &sce->tns, &sce->ics, 0);
2714
2715 for (sfb = 0; sfb < FFMIN(sce->ics.max_sfb, MAX_LTP_LONG_SFB); sfb++)
2716 if (ltp->used[sfb])
2717 for (i = offsets[sfb]; i < offsets[sfb + 1]; i++)
2718 sce->coeffs[i] += (UINTFLOAT)predFreq[i];
2719 }
2720 }
2721
2722 /**
2723 * Update the LTP buffer for next frame
2724 */
2725 static void update_ltp(AACContext *ac, SingleChannelElement *sce)
2726 {
2727 IndividualChannelStream *ics = &sce->ics;
2728 INTFLOAT *saved = sce->saved;
2729 INTFLOAT *saved_ltp = sce->coeffs;
2730 const INTFLOAT *lwindow = ics->use_kb_window[0] ? AAC_RENAME2(aac_kbd_long_1024) : AAC_RENAME2(sine_1024);
2731 const INTFLOAT *swindow = ics->use_kb_window[0] ? AAC_RENAME2(aac_kbd_short_128) : AAC_RENAME2(sine_128);
2732 int i;
2733
2734 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2735 memcpy(saved_ltp, saved, 512 * sizeof(*saved_ltp));
2736 memset(saved_ltp + 576, 0, 448 * sizeof(*saved_ltp));
2737 ac->fdsp->vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64);
2738
2739 for (i = 0; i < 64; i++)
2740 saved_ltp[i + 512] = AAC_MUL31(ac->buf_mdct[1023 - i], swindow[63 - i]);
2741 } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
2742 memcpy(saved_ltp, ac->buf_mdct + 512, 448 * sizeof(*saved_ltp));
2743 memset(saved_ltp + 576, 0, 448 * sizeof(*saved_ltp));
2744 ac->fdsp->vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64);
2745
2746 for (i = 0; i < 64; i++)
2747 saved_ltp[i + 512] = AAC_MUL31(ac->buf_mdct[1023 - i], swindow[63 - i]);
2748 } else { // LONG_STOP or ONLY_LONG
2749 ac->fdsp->vector_fmul_reverse(saved_ltp, ac->buf_mdct + 512, &lwindow[512], 512);
2750
2751 for (i = 0; i < 512; i++)
2752 saved_ltp[i + 512] = AAC_MUL31(ac->buf_mdct[1023 - i], lwindow[511 - i]);
2753 }
2754
2755 memcpy(sce->ltp_state, sce->ltp_state+1024, 1024 * sizeof(*sce->ltp_state));
2756 memcpy(sce->ltp_state+1024, sce->ret, 1024 * sizeof(*sce->ltp_state));
2757 memcpy(sce->ltp_state+2048, saved_ltp, 1024 * sizeof(*sce->ltp_state));
2758 }
2759
2760 /**
2761 * Conduct IMDCT and windowing.
2762 */
2763 static void imdct_and_windowing(AACContext *ac, SingleChannelElement *sce)
2764 {
2765 IndividualChannelStream *ics = &sce->ics;
2766 INTFLOAT *in = sce->coeffs;
2767 INTFLOAT *out = sce->ret;
2768 INTFLOAT *saved = sce->saved;
2769 const INTFLOAT *swindow = ics->use_kb_window[0] ? AAC_RENAME2(aac_kbd_short_128) : AAC_RENAME2(sine_128);
2770 const INTFLOAT *lwindow_prev = ics->use_kb_window[1] ? AAC_RENAME2(aac_kbd_long_1024) : AAC_RENAME2(sine_1024);
2771 const INTFLOAT *swindow_prev = ics->use_kb_window[1] ? AAC_RENAME2(aac_kbd_short_128) : AAC_RENAME2(sine_128);
2772 INTFLOAT *buf = ac->buf_mdct;
2773 INTFLOAT *temp = ac->temp;
2774 int i;
2775
2776 // imdct
2777 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2778 for (i = 0; i < 1024; i += 128)
2779 ac->mdct_small.imdct_half(&ac->mdct_small, buf + i, in + i);
2780 } else {
2781 ac->mdct.imdct_half(&ac->mdct, buf, in);
2782 #if USE_FIXED
2783 for (i=0; i<1024; i++)
2784 buf[i] = (buf[i] + 4LL) >> 3;
2785 #endif /* USE_FIXED */
2786 }
2787
2788 /* window overlapping
2789 * NOTE: To simplify the overlapping code, all 'meaningless' short to long
2790 * and long to short transitions are considered to be short to short
2791 * transitions. This leaves just two cases (long to long and short to short)
2792 * with a little special sauce for EIGHT_SHORT_SEQUENCE.
2793 */
2794 if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) &&
2795 (ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) {
2796 ac->fdsp->vector_fmul_window( out, saved, buf, lwindow_prev, 512);
2797 } else {
2798 memcpy( out, saved, 448 * sizeof(*out));
2799
2800 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2801 ac->fdsp->vector_fmul_window(out + 448 + 0*128, saved + 448, buf + 0*128, swindow_prev, 64);
2802 ac->fdsp->vector_fmul_window(out + 448 + 1*128, buf + 0*128 + 64, buf + 1*128, swindow, 64);
2803 ac->fdsp->vector_fmul_window(out + 448 + 2*128, buf + 1*128 + 64, buf + 2*128, swindow, 64);
2804 ac->fdsp->vector_fmul_window(out + 448 + 3*128, buf + 2*128 + 64, buf + 3*128, swindow, 64);
2805 ac->fdsp->vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, swindow, 64);
2806 memcpy( out + 448 + 4*128, temp, 64 * sizeof(*out));
2807 } else {
2808 ac->fdsp->vector_fmul_window(out + 448, saved + 448, buf, swindow_prev, 64);
2809 memcpy( out + 576, buf + 64, 448 * sizeof(*out));
2810 }
2811 }
2812
2813 // buffer update
2814 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2815 memcpy( saved, temp + 64, 64 * sizeof(*saved));
2816 ac->fdsp->vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, swindow, 64);
2817 ac->fdsp->vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, swindow, 64);
2818 ac->fdsp->vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, swindow, 64);
2819 memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(*saved));
2820 } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
2821 memcpy( saved, buf + 512, 448 * sizeof(*saved));
2822 memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(*saved));
2823 } else { // LONG_STOP or ONLY_LONG
2824 memcpy( saved, buf + 512, 512 * sizeof(*saved));
2825 }
2826 }
2827
2828 /**
2829 * Conduct IMDCT and windowing.
2830 */
2831 static void imdct_and_windowing_960(AACContext *ac, SingleChannelElement *sce)
2832 {
2833 #if !USE_FIXED
2834 IndividualChannelStream *ics = &sce->ics;
2835 INTFLOAT *in = sce->coeffs;
2836 INTFLOAT *out = sce->ret;
2837 INTFLOAT *saved = sce->saved;
2838 const INTFLOAT *swindow = ics->use_kb_window[0] ? AAC_RENAME(aac_kbd_short_120) : AAC_RENAME(sine_120);
2839 const INTFLOAT *lwindow_prev = ics->use_kb_window[1] ? AAC_RENAME(aac_kbd_long_960) : AAC_RENAME(sine_960);
2840 const INTFLOAT *swindow_prev = ics->use_kb_window[1] ? AAC_RENAME(aac_kbd_short_120) : AAC_RENAME(sine_120);
2841 INTFLOAT *buf = ac->buf_mdct;
2842 INTFLOAT *temp = ac->temp;
2843 int i;
2844
2845 // imdct
2846 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2847 for (i = 0; i < 8; i++)
2848 ac->mdct120->imdct_half(ac->mdct120, buf + i * 120, in + i * 128, 1);
2849 } else {
2850 ac->mdct960->imdct_half(ac->mdct960, buf, in, 1);
2851 }
2852
2853 /* window overlapping
2854 * NOTE: To simplify the overlapping code, all 'meaningless' short to long
2855 * and long to short transitions are considered to be short to short
2856 * transitions. This leaves just two cases (long to long and short to short)
2857 * with a little special sauce for EIGHT_SHORT_SEQUENCE.
2858 */
2859
2860 if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) &&
2861 (ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) {
2862 ac->fdsp->vector_fmul_window( out, saved, buf, lwindow_prev, 480);
2863 } else {
2864 memcpy( out, saved, 420 * sizeof(*out));
2865
2866 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2867 ac->fdsp->vector_fmul_window(out + 420 + 0*120, saved + 420, buf + 0*120, swindow_prev, 60);
2868 ac->fdsp->vector_fmul_window(out + 420 + 1*120, buf + 0*120 + 60, buf + 1*120, swindow, 60);
2869 ac->fdsp->vector_fmul_window(out + 420 + 2*120, buf + 1*120 + 60, buf + 2*120, swindow, 60);
2870 ac->fdsp->vector_fmul_window(out + 420 + 3*120, buf + 2*120 + 60, buf + 3*120, swindow, 60);
2871 ac->fdsp->vector_fmul_window(temp, buf + 3*120 + 60, buf + 4*120, swindow, 60);
2872 memcpy( out + 420 + 4*120, temp, 60 * sizeof(*out));
2873 } else {
2874 ac->fdsp->vector_fmul_window(out + 420, saved + 420, buf, swindow_prev, 60);
2875 memcpy( out + 540, buf + 60, 420 * sizeof(*out));
2876 }
2877 }
2878
2879 // buffer update
2880 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
2881 memcpy( saved, temp + 60, 60 * sizeof(*saved));
2882 ac->fdsp->vector_fmul_window(saved + 60, buf + 4*120 + 60, buf + 5*120, swindow, 60);
2883 ac->fdsp->vector_fmul_window(saved + 180, buf + 5*120 + 60, buf + 6*120, swindow, 60);
2884 ac->fdsp->vector_fmul_window(saved + 300, buf + 6*120 + 60, buf + 7*120, swindow, 60);
2885 memcpy( saved + 420, buf + 7*120 + 60, 60 * sizeof(*saved));
2886 } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
2887 memcpy( saved, buf + 480, 420 * sizeof(*saved));
2888 memcpy( saved + 420, buf + 7*120 + 60, 60 * sizeof(*saved));
2889 } else { // LONG_STOP or ONLY_LONG
2890 memcpy( saved, buf + 480, 480 * sizeof(*saved));
2891 }
2892 #endif
2893 }
2894 static void imdct_and_windowing_ld(AACContext *ac, SingleChannelElement *sce)
2895 {
2896 IndividualChannelStream *ics = &sce->ics;
2897 INTFLOAT *in = sce->coeffs;
2898 INTFLOAT *out = sce->ret;
2899 INTFLOAT *saved = sce->saved;
2900 INTFLOAT *buf = ac->buf_mdct;
2901 #if USE_FIXED
2902 int i;
2903 #endif /* USE_FIXED */
2904
2905 // imdct
2906 ac->mdct.imdct_half(&ac->mdct_ld, buf, in);
2907
2908 #if USE_FIXED
2909 for (i = 0; i < 1024; i++)
2910 buf[i] = (buf[i] + 2) >> 2;
2911 #endif /* USE_FIXED */
2912
2913 // window overlapping
2914 if (ics->use_kb_window[1]) {
2915 // AAC LD uses a low overlap sine window instead of a KBD window
2916 memcpy(out, saved, 192 * sizeof(*out));
2917 ac->fdsp->vector_fmul_window(out + 192, saved + 192, buf, AAC_RENAME2(sine_128), 64);
2918 memcpy( out + 320, buf + 64, 192 * sizeof(*out));
2919 } else {
2920 ac->fdsp->vector_fmul_window(out, saved, buf, AAC_RENAME2(sine_512), 256);
2921 }
2922
2923 // buffer update
2924 memcpy(saved, buf + 256, 256 * sizeof(*saved));
2925 }
2926
2927 static void imdct_and_windowing_eld(AACContext *ac, SingleChannelElement *sce)
2928 {
2929 UINTFLOAT *in = sce->coeffs;
2930 INTFLOAT *out = sce->ret;
2931 INTFLOAT *saved = sce->saved;
2932 INTFLOAT *buf = ac->buf_mdct;
2933 int i;
2934 const int n = ac->oc[1].m4ac.frame_length_short ? 480 : 512;
2935 const int n2 = n >> 1;
2936 const int n4 = n >> 2;
2937 const INTFLOAT *const window = n == 480 ? AAC_RENAME(ff_aac_eld_window_480) :
2938 AAC_RENAME(ff_aac_eld_window_512);
2939
2940 // Inverse transform, mapped to the conventional IMDCT by
2941 // Chivukula, R.K.; Reznik, Y.A.; Devarajan, V.,
2942 // "Efficient algorithms for MPEG-4 AAC-ELD, AAC-LD and AAC-LC filterbanks,"
2943 // International Conference on Audio, Language and Image Processing, ICALIP 2008.
2944 // URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4590245&isnumber=4589950
2945 for (i = 0; i < n2; i+=2) {
2946 INTFLOAT temp;
2947 temp = in[i ]; in[i ] = -in[n - 1 - i]; in[n - 1 - i] = temp;
2948 temp = -in[i + 1]; in[i + 1] = in[n - 2 - i]; in[n - 2 - i] = temp;
2949 }
2950 #if !USE_FIXED
2951 if (n == 480)
2952 ac->mdct480->imdct_half(ac->mdct480, buf, in, 1);
2953 else
2954 #endif
2955 ac->mdct.imdct_half(&ac->mdct_ld, buf, in);
2956
2957 #if USE_FIXED
2958 for (i = 0; i < 1024; i++)
2959 buf[i] = (buf[i] + 1) >> 1;
2960 #endif /* USE_FIXED */
2961
2962 for (i = 0; i < n; i+=2) {
2963 buf[i] = -buf[i];
2964 }
2965 // Like with the regular IMDCT at this point we still have the middle half
2966 // of a transform but with even symmetry on the left and odd symmetry on
2967 // the right
2968
2969 // window overlapping
2970 // The spec says to use samples [0..511] but the reference decoder uses
2971 // samples [128..639].
2972 for (i = n4; i < n2; i ++) {
2973 out[i - n4] = AAC_MUL31( buf[ n2 - 1 - i] , window[i - n4]) +
2974 AAC_MUL31( saved[ i + n2] , window[i + n - n4]) +
2975 AAC_MUL31(-saved[n + n2 - 1 - i] , window[i + 2*n - n4]) +
2976 AAC_MUL31(-saved[ 2*n + n2 + i] , window[i + 3*n - n4]);
2977 }
2978 for (i = 0; i < n2; i ++) {
2979 out[n4 + i] = AAC_MUL31( buf[ i] , window[i + n2 - n4]) +
2980 AAC_MUL31(-saved[ n - 1 - i] , window[i + n2 + n - n4]) +
2981 AAC_MUL31(-saved[ n + i] , window[i + n2 + 2*n - n4]) +
2982 AAC_MUL31( saved[2*n + n - 1 - i] , window[i + n2 + 3*n - n4]);
2983 }
2984 for (i = 0; i < n4; i ++) {
2985 out[n2 + n4 + i] = AAC_MUL31( buf[ i + n2] , window[i + n - n4]) +
2986 AAC_MUL31(-saved[n2 - 1 - i] , window[i + 2*n - n4]) +
2987 AAC_MUL31(-saved[n + n2 + i] , window[i + 3*n - n4]);
2988 }
2989
2990 // buffer update
2991 memmove(saved + n, saved, 2 * n * sizeof(*saved));
2992 memcpy( saved, buf, n * sizeof(*saved));
2993 }
2994
2995 /**
2996 * channel coupling transformation interface
2997 *
2998 * @param apply_coupling_method pointer to (in)dependent coupling function
2999 */
3000 static void apply_channel_coupling(AACContext *ac, ChannelElement *cc,
3001 enum RawDataBlockType type, int elem_id,
3002 enum CouplingPoint coupling_point,
3003 void (*apply_coupling_method)(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index))
3004 {
3005 int i, c;
3006
3007 for (i = 0; i < MAX_ELEM_ID; i++) {
3008 ChannelElement *cce = ac->che[TYPE_CCE][i];
3009 int index = 0;
3010
3011 if (cce && cce->coup.coupling_point == coupling_point) {
3012 ChannelCoupling *coup = &cce->coup;
3013
3014 for (c = 0; c <= coup->num_coupled; c++) {
3015 if (coup->type[c] == type && coup->id_select[c] == elem_id) {
3016 if (coup->ch_select[c] != 1) {
3017 apply_coupling_method(ac, &cc->ch[0], cce, index);
3018 if (coup->ch_select[c] != 0)
3019 index++;
3020 }
3021 if (coup->ch_select[c] != 2)
3022 apply_coupling_method(ac, &cc->ch[1], cce, index++);
3023 } else
3024 index += 1 + (coup->ch_select[c] == 3);
3025 }
3026 }
3027 }
3028 }
3029
3030 /**
3031 * Convert spectral data to samples, applying all supported tools as appropriate.
3032 */
3033 static void spectral_to_sample(AACContext *ac, int samples)
3034 {
3035 int i, type;
3036 void (*imdct_and_window)(AACContext *ac, SingleChannelElement *sce);
3037 switch (ac->oc[1].m4ac.object_type) {
3038 case AOT_ER_AAC_LD:
3039 imdct_and_window = imdct_and_windowing_ld;
3040 break;
3041 case AOT_ER_AAC_ELD:
3042 imdct_and_window = imdct_and_windowing_eld;
3043 break;
3044 default:
3045 if (ac->oc[1].m4ac.frame_length_short)
3046 imdct_and_window = imdct_and_windowing_960;
3047 else
3048 imdct_and_window = ac->imdct_and_windowing;
3049 }
3050 for (type = 3; type >= 0; type--) {
3051 for (i = 0; i < MAX_ELEM_ID; i++) {
3052 ChannelElement *che = ac->che[type][i];
3053 if (che && che->present) {
3054 if (type <= TYPE_CPE)
3055 apply_channel_coupling(ac, che, type, i, BEFORE_TNS, AAC_RENAME(apply_dependent_coupling));
3056 if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) {
3057 if (che->ch[0].ics.predictor_present) {
3058 if (che->ch[0].ics.ltp.present)
3059 ac->apply_ltp(ac, &che->ch[0]);
3060 if (che->ch[1].ics.ltp.present && type == TYPE_CPE)
3061 ac->apply_ltp(ac, &che->ch[1]);
3062 }
3063 }
3064 if (che->ch[0].tns.present)
3065 ac->apply_tns(che->ch[0].coeffs, &che->ch[0].tns, &che->ch[0].ics, 1);
3066 if (che->ch[1].tns.present)
3067 ac->apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1);
3068 if (type <= TYPE_CPE)
3069 apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, AAC_RENAME(apply_dependent_coupling));
3070 if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT) {
3071 imdct_and_window(ac, &che->ch[0]);
3072 if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP)
3073 ac->update_ltp(ac, &che->ch[0]);
3074 if (type == TYPE_CPE) {
3075 imdct_and_window(ac, &che->ch[1]);
3076 if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP)
3077 ac->update_ltp(ac, &che->ch[1]);
3078 }
3079 if (ac->oc[1].m4ac.sbr > 0) {
3080 AAC_RENAME(ff_sbr_apply)(ac, &che->sbr, type, che->ch[0].ret, che->ch[1].ret);
3081 }
3082 }
3083 if (type <= TYPE_CCE)
3084 apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, AAC_RENAME(apply_independent_coupling));
3085
3086 #if USE_FIXED
3087 {
3088 int j;
3089 /* preparation for resampler */
3090 for(j = 0; j<samples; j++){
3091 che->ch[0].ret[j] = (int32_t)av_clip64((int64_t)che->ch[0].ret[j]*128, INT32_MIN, INT32_MAX-0x8000)+0x8000;
3092 if(type == TYPE_CPE)
3093 che->ch[1].ret[j] = (int32_t)av_clip64((int64_t)che->ch[1].ret[j]*128, INT32_MIN, INT32_MAX-0x8000)+0x8000;
3094 }
3095 }
3096 #endif /* USE_FIXED */
3097 che->present = 0;
3098 } else if (che) {
3099 av_log(ac->avctx, AV_LOG_VERBOSE, "ChannelElement %d.%d missing \n", type, i);
3100 }
3101 }
3102 }
3103 }
3104
3105 static int parse_adts_frame_header(AACContext *ac, GetBitContext *gb)
3106 {
3107 int size;
3108 AACADTSHeaderInfo hdr_info;
3109 uint8_t layout_map[MAX_ELEM_ID*4][3];
3110 int layout_map_tags, ret;
3111
3112 size = ff_adts_header_parse(gb, &hdr_info);
3113 if (size > 0) {
3114 if (!ac->warned_num_aac_frames && hdr_info.num_aac_frames != 1) {
3115 // This is 2 for "VLB " audio in NSV files.
3116 // See samples/nsv/vlb_audio.
3117 avpriv_report_missing_feature(ac->avctx,
3118 "More than one AAC RDB per ADTS frame");
3119 ac->warned_num_aac_frames = 1;
3120 }
3121 push_output_configuration(ac);
3122 if (hdr_info.chan_config) {
3123 ac->oc[1].m4ac.chan_config = hdr_info.chan_config;
3124 if ((ret = set_default_channel_config(ac, ac->avctx,
3125 layout_map,
3126 &layout_map_tags,
3127 hdr_info.chan_config)) < 0)
3128 return ret;
3129 if ((ret = output_configure(ac, layout_map, layout_map_tags,
3130 FFMAX(ac->oc[1].status,
3131 OC_TRIAL_FRAME), 0)) < 0)
3132 return ret;
3133 } else {
3134 ac->oc[1].m4ac.chan_config = 0;
3135 /**
3136 * dual mono frames in Japanese DTV can have chan_config 0
3137 * WITHOUT specifying PCE.
3138 * thus, set dual mono as default.
3139 */
3140 if (ac->dmono_mode && ac->oc[0].status == OC_NONE) {
3141 layout_map_tags = 2;
3142 layout_map[0][0] = layout_map[1][0] = TYPE_SCE;
3143 layout_map[0][2] = layout_map[1][2] = AAC_CHANNEL_FRONT;
3144 layout_map[0][1] = 0;
3145 layout_map[1][1] = 1;
3146 if (output_configure(ac, layout_map, layout_map_tags,
3147 OC_TRIAL_FRAME, 0))
3148 return -7;
3149 }
3150 }
3151 ac->oc[1].m4ac.sample_rate = hdr_info.sample_rate;
3152 ac->oc[1].m4ac.sampling_index = hdr_info.sampling_index;
3153 ac->oc[1].m4ac.object_type = hdr_info.object_type;
3154 ac->oc[1].m4ac.frame_length_short = 0;
3155 if (ac->oc[0].status != OC_LOCKED ||
3156 ac->oc[0].m4ac.chan_config != hdr_info.chan_config ||
3157 ac->oc[0].m4ac.sample_rate != hdr_info.sample_rate) {
3158 ac->oc[1].m4ac.sbr = -1;
3159 ac->oc[1].m4ac.ps = -1;
3160 }
3161 if (!hdr_info.crc_absent)
3162 skip_bits(gb, 16);
3163 }
3164 return size;
3165 }
3166
3167 static int aac_decode_er_frame(AVCodecContext *avctx, void *data,
3168 int *got_frame_ptr, GetBitContext *gb)
3169 {
3170 AACContext *ac = avctx->priv_data;
3171 const MPEG4AudioConfig *const m4ac = &ac->oc[1].m4ac;
3172 ChannelElement *che;
3173 int err, i;
3174 int samples = m4ac->frame_length_short ? 960 : 1024;
3175 int chan_config = m4ac->chan_config;
3176 int aot = m4ac->object_type;
3177
3178 if (aot == AOT_ER_AAC_LD || aot == AOT_ER_AAC_ELD)
3179 samples >>= 1;
3180
3181 ac->frame = data;
3182
3183 if ((err = frame_configure_elements(avctx)) < 0)
3184 return err;
3185
3186 // The FF_PROFILE_AAC_* defines are all object_type - 1
3187 // This may lead to an undefined profile being signaled
3188 ac->avctx->profile = aot - 1;
3189
3190 ac->tags_mapped = 0;
3191
3192 if (chan_config < 0 || (chan_config >= 8 && chan_config < 11) || chan_config >= 13) {
3193 avpriv_request_sample(avctx, "Unknown ER channel configuration %d",
3194 chan_config);
3195 return AVERROR_INVALIDDATA;
3196 }
3197 for (i = 0; i < tags_per_config[chan_config]; i++) {
3198 const int elem_type = aac_channel_layout_map[chan_config-1][i][0];
3199 const int elem_id = aac_channel_layout_map[chan_config-1][i][1];
3200 if (!(che=get_che(ac, elem_type, elem_id))) {
3201 av_log(ac->avctx, AV_LOG_ERROR,
3202 "channel element %d.%d is not allocated\n",
3203 elem_type, elem_id);
3204 return AVERROR_INVALIDDATA;
3205 }
3206 che->present = 1;
3207 if (aot != AOT_ER_AAC_ELD)
3208 skip_bits(gb, 4);
3209 switch (elem_type) {
3210 case TYPE_SCE:
3211 err = decode_ics(ac, &che->ch[0], gb, 0, 0);
3212 break;
3213 case TYPE_CPE:
3214 err = decode_cpe(ac, gb, che);
3215 break;
3216 case TYPE_LFE:
3217 err = decode_ics(ac, &che->ch[0], gb, 0, 0);
3218 break;
3219 }
3220 if (err < 0)
3221 return err;
3222 }
3223
3224 spectral_to_sample(ac, samples);
3225
3226 if (!ac->frame->data[0] && samples) {
3227 av_log(avctx, AV_LOG_ERROR, "no frame data found\n");
3228 return AVERROR_INVALIDDATA;
3229 }
3230
3231 ac->frame->nb_samples = samples;
3232 ac->frame->sample_rate = avctx->sample_rate;
3233 *got_frame_ptr = 1;
3234
3235 skip_bits_long(gb, get_bits_left(gb));
3236 return 0;
3237 }
3238
3239 static int aac_decode_frame_int(AVCodecContext *avctx, AVFrame *frame,
3240 int *got_frame_ptr, GetBitContext *gb,
3241 const AVPacket *avpkt)
3242 {
3243 AACContext *ac = avctx->priv_data;
3244 ChannelElement *che = NULL, *che_prev = NULL;
3245 enum RawDataBlockType elem_type, che_prev_type = TYPE_END;
3246 int err, elem_id;
3247 int samples = 0, multiplier, audio_found = 0, pce_found = 0;
3248 int is_dmono, sce_count = 0;
3249 int payload_alignment;
3250 uint8_t che_presence[4][MAX_ELEM_ID] = {{0}};
3251
3252 ac->frame = frame;
3253
3254 if (show_bits(gb, 12) == 0xfff) {
3255 if ((err = parse_adts_frame_header(ac, gb)) < 0) {
3256 av_log(avctx, AV_LOG_ERROR, "Error decoding AAC frame header.\n");
3257 goto fail;
3258 }
3259 if (ac->oc[1].m4ac.sampling_index > 12) {
3260 av_log(ac->avctx, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->oc[1].m4ac.sampling_index);
3261 err = AVERROR_INVALIDDATA;
3262 goto fail;
3263 }
3264 }
3265
3266 if ((err = frame_configure_elements(avctx)) < 0)
3267 goto fail;
3268
3269 // The FF_PROFILE_AAC_* defines are all object_type - 1
3270 // This may lead to an undefined profile being signaled
3271 ac->avctx->profile = ac->oc[1].m4ac.object_type - 1;
3272
3273 payload_alignment = get_bits_count(gb);
3274 ac->tags_mapped = 0;
3275 // parse
3276 while ((elem_type = get_bits(gb, 3)) != TYPE_END) {
3277 elem_id = get_bits(gb, 4);
3278
3279 if (avctx->debug & FF_DEBUG_STARTCODE)
3280 av_log(avctx, AV_LOG_DEBUG, "Elem type:%x id:%x\n", elem_type, elem_id);
3281
3282 if (!avctx->ch_layout.nb_channels && elem_type != TYPE_PCE) {
3283 err = AVERROR_INVALIDDATA;
3284 goto fail;
3285 }
3286
3287 if (elem_type < TYPE_DSE) {
3288 if (che_presence[elem_type][elem_id]) {
3289 int error = che_presence[elem_type][elem_id] > 1;
3290 av_log(ac->avctx, error ? AV_LOG_ERROR : AV_LOG_DEBUG, "channel element %d.%d duplicate\n",
3291 elem_type, elem_id);
3292 if (error) {
3293 err = AVERROR_INVALIDDATA;
3294 goto fail;
3295 }
3296 }
3297 che_presence[elem_type][elem_id]++;
3298
3299 if (!(che=get_che(ac, elem_type, elem_id))) {
3300 av_log(ac->avctx, AV_LOG_ERROR, "channel element %d.%d is not allocated\n",
3301 elem_type, elem_id);
3302 err = AVERROR_INVALIDDATA;
3303 goto fail;
3304 }
3305 samples = ac->oc[1].m4ac.frame_length_short ? 960 : 1024;
3306 che->present = 1;
3307 }
3308
3309 switch (elem_type) {
3310
3311 case TYPE_SCE:
3312 err = decode_ics(ac, &che->ch[0], gb, 0, 0);
3313 audio_found = 1;
3314 sce_count++;
3315 break;
3316
3317 case TYPE_CPE:
3318 err = decode_cpe(ac, gb, che);
3319 audio_found = 1;
3320 break;
3321
3322 case TYPE_CCE:
3323 err = decode_cce(ac, gb, che);
3324 break;
3325
3326 case TYPE_LFE:
3327 err = decode_ics(ac, &che->ch[0], gb, 0, 0);
3328 audio_found = 1;
3329 break;
3330
3331 case TYPE_DSE:
3332 err = skip_data_stream_element(ac, gb);
3333 break;
3334
3335 case TYPE_PCE: {
3336 uint8_t layout_map[MAX_ELEM_ID*4][3] = {{0}};
3337 int tags;
3338
3339 int pushed = push_output_configuration(ac);
3340 if (pce_found && !pushed) {
3341 err = AVERROR_INVALIDDATA;
3342 goto fail;
3343 }
3344
3345 tags = decode_pce(avctx, &ac->oc[1].m4ac, layout_map, gb,
3346 payload_alignment);
3347 if (tags < 0) {
3348 err = tags;
3349 break;
3350 }
3351 if (pce_found) {
3352 av_log(avctx, AV_LOG_ERROR,
3353 "Not evaluating a further program_config_element as this construct is dubious at best.\n");
3354 pop_output_configuration(ac);
3355 } else {
3356 err = output_configure(ac, layout_map, tags, OC_TRIAL_PCE, 1);
3357 if (!err)
3358 ac->oc[1].m4ac.chan_config = 0;
3359 pce_found = 1;
3360 }
3361 break;
3362 }
3363
3364 case TYPE_FIL:
3365 if (elem_id == 15)
3366 elem_id += get_bits(gb, 8) - 1;
3367 if (get_bits_left(gb) < 8 * elem_id) {
3368 av_log(avctx, AV_LOG_ERROR, "TYPE_FIL: "overread_err);
3369 err = AVERROR_INVALIDDATA;
3370 goto fail;
3371 }
3372 err = 0;
3373 while (elem_id > 0) {
3374 int ret = decode_extension_payload(ac, gb, elem_id, che_prev, che_prev_type);
3375 if (ret < 0) {
3376 err = ret;
3377 break;
3378 }
3379 elem_id -= ret;
3380 }
3381 break;
3382
3383 default:
3384 err = AVERROR_BUG; /* should not happen, but keeps compiler happy */
3385 break;
3386 }
3387
3388 if (elem_type < TYPE_DSE) {
3389 che_prev = che;
3390 che_prev_type = elem_type;
3391 }
3392
3393 if (err)
3394 goto fail;
3395
3396 if (get_bits_left(gb) < 3) {
3397 av_log(avctx, AV_LOG_ERROR, overread_err);
3398 err = AVERROR_INVALIDDATA;
3399 goto fail;
3400 }
3401 }
3402
3403 if (!avctx->ch_layout.nb_channels) {
3404 *got_frame_ptr = 0;
3405 return 0;
3406 }
3407
3408 multiplier = (ac->oc[1].m4ac.sbr == 1) ? ac->oc[1].m4ac.ext_sample_rate > ac->oc[1].m4ac.sample_rate : 0;
3409 samples <<= multiplier;
3410
3411 spectral_to_sample(ac, samples);
3412
3413 if (ac->oc[1].status && audio_found) {
3414 avctx->sample_rate = ac->oc[1].m4ac.sample_rate << multiplier;
3415 avctx->frame_size = samples;
3416 ac->oc[1].status = OC_LOCKED;
3417 }
3418
3419 if (multiplier)
3420 avctx->internal->skip_samples_multiplier = 2;
3421
3422 if (!ac->frame->data[0] && samples) {
3423 av_log(avctx, AV_LOG_ERROR, "no frame data found\n");
3424 err = AVERROR_INVALIDDATA;
3425 goto fail;
3426 }
3427
3428 if (samples) {
3429 ac->frame->nb_samples = samples;
3430 ac->frame->sample_rate = avctx->sample_rate;
3431 } else
3432 av_frame_unref(ac->frame);
3433 *got_frame_ptr = !!samples;
3434
3435 /* for dual-mono audio (SCE + SCE) */
3436 is_dmono = ac->dmono_mode && sce_count == 2 &&
3437 !av_channel_layout_compare(&ac->oc[1].ch_layout,
3438 &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO);
3439 if (is_dmono) {
3440 if (ac->dmono_mode == 1)
3441 frame->data[1] = frame->data[0];
3442 else if (ac->dmono_mode == 2)
3443 frame->data[0] = frame->data[1];
3444 }
3445
3446 return 0;
3447 fail:
3448 pop_output_configuration(ac);
3449 return err;
3450 }
3451
3452 static int aac_decode_frame(AVCodecContext *avctx, AVFrame *frame,
3453 int *got_frame_ptr, AVPacket *avpkt)
3454 {
3455 AACContext *ac = avctx->priv_data;
3456 const uint8_t *buf = avpkt->data;
3457 int buf_size = avpkt->size;
3458 GetBitContext gb;
3459 int buf_consumed;
3460 int buf_offset;
3461 int err;
3462 size_t new_extradata_size;
3463 const uint8_t *new_extradata = av_packet_get_side_data(avpkt,
3464 AV_PKT_DATA_NEW_EXTRADATA,
3465 &new_extradata_size);
3466 size_t jp_dualmono_size;
3467 const uint8_t *jp_dualmono = av_packet_get_side_data(avpkt,
3468 AV_PKT_DATA_JP_DUALMONO,
3469 &jp_dualmono_size);
3470
3471 if (new_extradata) {
3472 /* discard previous configuration */
3473 ac->oc[1].status = OC_NONE;
3474 err = decode_audio_specific_config(ac, ac->avctx, &ac->oc[1].m4ac,
3475 new_extradata,
3476 new_extradata_size * 8LL, 1);
3477 if (err < 0) {
3478 return err;
3479 }
3480 }
3481
3482 ac->dmono_mode = 0;
3483 if (jp_dualmono && jp_dualmono_size > 0)
3484 ac->dmono_mode = 1 + *jp_dualmono;
3485 if (ac->force_dmono_mode >= 0)
3486 ac->dmono_mode = ac->force_dmono_mode;
3487
3488 if (INT_MAX / 8 <= buf_size)
3489 return AVERROR_INVALIDDATA;
3490
3491 if ((err = init_get_bits8(&gb, buf, buf_size)) < 0)
3492 return err;
3493
3494 switch (ac->oc[1].m4ac.object_type) {
3495 case AOT_ER_AAC_LC:
3496 case AOT_ER_AAC_LTP:
3497 case AOT_ER_AAC_LD:
3498 case AOT_ER_AAC_ELD:
3499 err = aac_decode_er_frame(avctx, frame, got_frame_ptr, &gb);
3500 break;
3501 default:
3502 err = aac_decode_frame_int(avctx, frame, got_frame_ptr, &gb, avpkt);
3503 }
3504 if (err < 0)
3505 return err;
3506
3507 buf_consumed = (get_bits_count(&gb) + 7) >> 3;
3508 for (buf_offset = buf_consumed; buf_offset < buf_size; buf_offset++)
3509 if (buf[buf_offset])
3510 break;
3511
3512 return buf_size > buf_offset ? buf_consumed : buf_size;
3513 }
3514
3515 static av_cold int aac_decode_close(AVCodecContext *avctx)
3516 {
3517 AACContext *ac = avctx->priv_data;
3518 int i, type;
3519
3520 for (i = 0; i < MAX_ELEM_ID; i++) {
3521 for (type = 0; type < 4; type++) {
3522 if (ac->che[type][i])
3523 AAC_RENAME(ff_aac_sbr_ctx_close)(&ac->che[type][i]->sbr);
3524 av_freep(&ac->che[type][i]);
3525 }
3526 }
3527
3528 ff_mdct_end(&ac->mdct);
3529 ff_mdct_end(&ac->mdct_small);
3530 ff_mdct_end(&ac->mdct_ld);
3531 ff_mdct_end(&ac->mdct_ltp);
3532 #if !USE_FIXED
3533 ff_mdct15_uninit(&ac->mdct120);
3534 ff_mdct15_uninit(&ac->mdct480);
3535 ff_mdct15_uninit(&ac->mdct960);
3536 #endif
3537 av_freep(&ac->fdsp);
3538 return 0;
3539 }
3540
3541 static void aacdec_init(AACContext *c)
3542 {
3543 c->imdct_and_windowing = imdct_and_windowing;
3544 c->apply_ltp = apply_ltp;
3545 c->apply_tns = apply_tns;
3546 c->windowing_and_mdct_ltp = windowing_and_mdct_ltp;
3547 c->update_ltp = update_ltp;
3548 #if USE_FIXED
3549 c->vector_pow43 = vector_pow43;
3550 c->subband_scale = subband_scale;
3551 #endif
3552
3553 #if !USE_FIXED
3554 #if ARCH_MIPS
3555 ff_aacdec_init_mips(c);
3556 #endif
3557 #endif /* !USE_FIXED */
3558 }
3559 /**
3560 * AVOptions for Japanese DTV specific extensions (ADTS only)
3561 */
3562 #define AACDEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
3563 static const AVOption options[] = {
3564 {"dual_mono_mode", "Select the channel to decode for dual mono",
3565 offsetof(AACContext, force_dmono_mode), AV_OPT_TYPE_INT, {.i64=-1}, -1, 2,
3566 AACDEC_FLAGS, "dual_mono_mode"},
3567
3568 {"auto", "autoselection", 0, AV_OPT_TYPE_CONST, {.i64=-1}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
3569 {"main", "Select Main/Left channel", 0, AV_OPT_TYPE_CONST, {.i64= 1}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
3570 {"sub" , "Select Sub/Right channel", 0, AV_OPT_TYPE_CONST, {.i64= 2}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
3571 {"both", "Select both channels", 0, AV_OPT_TYPE_CONST, {.i64= 0}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
3572
3573 { "channel_order", "Order in which the channels are to be exported",
3574 offsetof(AACContext, output_channel_order), AV_OPT_TYPE_INT,
3575 { .i64 = CHANNEL_ORDER_DEFAULT }, 0, 1, AACDEC_FLAGS, "channel_order" },
3576 { "default", "normal libavcodec channel order", 0, AV_OPT_TYPE_CONST,
3577 { .i64 = CHANNEL_ORDER_DEFAULT }, .flags = AACDEC_FLAGS, "channel_order" },
3578 { "coded", "order in which the channels are coded in the bitstream",
3579 0, AV_OPT_TYPE_CONST, { .i64 = CHANNEL_ORDER_CODED }, .flags = AACDEC_FLAGS, "channel_order" },
3580
3581 {NULL},
3582 };
3583
3584 static const AVClass aac_decoder_class = {
3585 .class_name = "AAC decoder",
3586 .item_name = av_default_item_name,
3587 .option = options,
3588 .version = LIBAVUTIL_VERSION_INT,
3589 };
3590