3 * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4 * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
7 * Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
8 * Copyright (c) 2010 Janne Grunau <janne-ffmpeg@jannau.net>
10 * This file is part of Libav.
12 * Libav is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * Libav is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with Libav; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 * @author Oded Shimon ( ods15 ods15 dyndns org )
31 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
38 * N (code in SoC repo) gain control
40 * Y window shapes - standard
41 * N window shapes - Low Delay
42 * Y filterbank - standard
43 * N (code in SoC repo) filterbank - Scalable Sample Rate
44 * Y Temporal Noise Shaping
45 * Y Long Term Prediction
48 * Y frequency domain prediction
49 * Y Perceptual Noise Substitution
51 * N Scalable Inverse AAC Quantization
52 * N Frequency Selective Switch
54 * Y quantization & coding - AAC
55 * N quantization & coding - TwinVQ
56 * N quantization & coding - BSAC
57 * N AAC Error Resilience tools
58 * N Error Resilience payload syntax
59 * N Error Protection tool
61 * N Silence Compression
64 * N Structured Audio tools
65 * N Structured Audio Sample Bank Format
67 * N Harmonic and Individual Lines plus Noise
68 * N Text-To-Speech Interface
69 * Y Spectral Band Replication
70 * Y (not in this code) Layer-1
71 * Y (not in this code) Layer-2
72 * Y (not in this code) Layer-3
73 * N SinuSoidal Coding (Transient, Sinusoid, Noise)
75 * N Direct Stream Transfer
77 * Note: - HE AAC v1 comprises LC AAC with Spectral Band Replication.
78 * - HE AAC v2 comprises LC AAC with Spectral Band Replication and
88 #include "fmtconvert.h"
95 #include "aacdectab.h"
96 #include "cbrt_tablegen.h"
99 #include "mpeg4audio.h"
100 #include "aacadtsdec.h"
108 # include "arm/aac.h"
116 static VLC vlc_scalefactors;
117 static VLC vlc_spectral[11];
119 static const char overread_err[] = "Input buffer exhausted before END element found\n";
121 static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
123 // For PCE based channel configurations map the channels solely based on tags.
124 if (!ac->m4ac.chan_config) {
125 return ac->tag_che_map[type][elem_id];
127 // For indexed channel configurations map the channels solely based on position.
128 switch (ac->m4ac.chan_config) {
130 if (ac->tags_mapped == 3 && type == TYPE_CPE) {
132 return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2];
135 /* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
136 instead of SCE[0] CPE[0] CPE[1] LFE[0]. If we seem to have
137 encountered such a stream, transfer the LFE[0] element to the SCE[1]'s mapping */
138 if (ac->tags_mapped == tags_per_config[ac->m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) {
140 return ac->tag_che_map[type][elem_id] = ac->che[TYPE_LFE][0];
143 if (ac->tags_mapped == 2 && type == TYPE_CPE) {
145 return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1];
148 if (ac->tags_mapped == 2 && ac->m4ac.chan_config == 4 && type == TYPE_SCE) {
150 return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
154 if (ac->tags_mapped == (ac->m4ac.chan_config != 2) && type == TYPE_CPE) {
156 return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][0];
157 } else if (ac->m4ac.chan_config == 2) {
161 if (!ac->tags_mapped && type == TYPE_SCE) {
163 return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][0];
171 * Check for the channel element in the current channel position configuration.
172 * If it exists, make sure the appropriate element is allocated and map the
173 * channel order to match the internal Libav channel layout.
175 * @param che_pos current channel position configuration
176 * @param type channel element type
177 * @param id channel element id
178 * @param channels count of the number of channels in the configuration
180 * @return Returns error status. 0 - OK, !0 - error
182 static av_cold int che_configure(AACContext *ac,
183 enum ChannelPosition che_pos[4][MAX_ELEM_ID],
184 int type, int id, int *channels)
186 if (che_pos[type][id]) {
187 if (!ac->che[type][id]) {
188 if (!(ac->che[type][id] = av_mallocz(sizeof(ChannelElement))))
189 return AVERROR(ENOMEM);
190 ff_aac_sbr_ctx_init(ac, &ac->che[type][id]->sbr);
192 if (type != TYPE_CCE) {
193 ac->output_data[(*channels)++] = ac->che[type][id]->ch[0].ret;
194 if (type == TYPE_CPE ||
195 (type == TYPE_SCE && ac->m4ac.ps == 1)) {
196 ac->output_data[(*channels)++] = ac->che[type][id]->ch[1].ret;
200 if (ac->che[type][id])
201 ff_aac_sbr_ctx_close(&ac->che[type][id]->sbr);
202 av_freep(&ac->che[type][id]);
208 * Configure output channel order based on the current program configuration element.
210 * @param che_pos current channel position configuration
211 * @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
213 * @return Returns error status. 0 - OK, !0 - error
215 static av_cold int output_configure(AACContext *ac,
216 enum ChannelPosition che_pos[4][MAX_ELEM_ID],
217 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
218 int channel_config, enum OCStatus oc_type)
220 AVCodecContext *avctx = ac->avctx;
221 int i, type, channels = 0, ret;
223 if (new_che_pos != che_pos)
224 memcpy(che_pos, new_che_pos, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
226 if (channel_config) {
227 for (i = 0; i < tags_per_config[channel_config]; i++) {
228 if ((ret = che_configure(ac, che_pos,
229 aac_channel_layout_map[channel_config - 1][i][0],
230 aac_channel_layout_map[channel_config - 1][i][1],
235 memset(ac->tag_che_map, 0, 4 * MAX_ELEM_ID * sizeof(ac->che[0][0]));
237 avctx->channel_layout = aac_channel_layout[channel_config - 1];
239 /* Allocate or free elements depending on if they are in the
240 * current program configuration.
242 * Set up default 1:1 output mapping.
244 * For a 5.1 stream the output order will be:
245 * [ Center ] [ Front Left ] [ Front Right ] [ LFE ] [ Surround Left ] [ Surround Right ]
248 for (i = 0; i < MAX_ELEM_ID; i++) {
249 for (type = 0; type < 4; type++) {
250 if ((ret = che_configure(ac, che_pos, type, i, &channels)))
255 memcpy(ac->tag_che_map, ac->che, 4 * MAX_ELEM_ID * sizeof(ac->che[0][0]));
257 avctx->channel_layout = 0;
260 avctx->channels = channels;
262 ac->output_configured = oc_type;
268 * Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
270 * @param cpe_map Stereo (Channel Pair Element) map, NULL if stereo bit is not present.
271 * @param sce_map mono (Single Channel Element) map
272 * @param type speaker type/position for these channels
274 static void decode_channel_map(enum ChannelPosition *cpe_map,
275 enum ChannelPosition *sce_map,
276 enum ChannelPosition type,
277 GetBitContext *gb, int n)
280 enum ChannelPosition *map = cpe_map && get_bits1(gb) ? cpe_map : sce_map; // stereo or mono map
281 map[get_bits(gb, 4)] = type;
286 * Decode program configuration element; reference: table 4.2.
288 * @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
290 * @return Returns error status. 0 - OK, !0 - error
292 static int decode_pce(AVCodecContext *avctx, MPEG4AudioConfig *m4ac,
293 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
296 int num_front, num_side, num_back, num_lfe, num_assoc_data, num_cc, sampling_index;
299 skip_bits(gb, 2); // object_type
301 sampling_index = get_bits(gb, 4);
302 if (m4ac->sampling_index != sampling_index)
303 av_log(avctx, AV_LOG_WARNING, "Sample rate index in program config element does not match the sample rate index configured by the container.\n");
305 num_front = get_bits(gb, 4);
306 num_side = get_bits(gb, 4);
307 num_back = get_bits(gb, 4);
308 num_lfe = get_bits(gb, 2);
309 num_assoc_data = get_bits(gb, 3);
310 num_cc = get_bits(gb, 4);
313 skip_bits(gb, 4); // mono_mixdown_tag
315 skip_bits(gb, 4); // stereo_mixdown_tag
318 skip_bits(gb, 3); // mixdown_coeff_index and pseudo_surround
320 decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_FRONT, gb, num_front);
321 decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_SIDE, gb, num_side );
322 decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_BACK, gb, num_back );
323 decode_channel_map(NULL, new_che_pos[TYPE_LFE], AAC_CHANNEL_LFE, gb, num_lfe );
325 skip_bits_long(gb, 4 * num_assoc_data);
327 decode_channel_map(new_che_pos[TYPE_CCE], new_che_pos[TYPE_CCE], AAC_CHANNEL_CC, gb, num_cc );
331 /* comment field, first byte is length */
332 comment_len = get_bits(gb, 8) * 8;
333 if (get_bits_left(gb) < comment_len) {
334 av_log(avctx, AV_LOG_ERROR, overread_err);
337 skip_bits_long(gb, comment_len);
342 * Set up channel positions based on a default channel configuration
343 * as specified in table 1.17.
345 * @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
347 * @return Returns error status. 0 - OK, !0 - error
349 static av_cold int set_default_channel_config(AVCodecContext *avctx,
350 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
353 if (channel_config < 1 || channel_config > 7) {
354 av_log(avctx, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
359 /* default channel configurations:
361 * 1ch : front center (mono)
362 * 2ch : L + R (stereo)
363 * 3ch : front center + L + R
364 * 4ch : front center + L + R + back center
365 * 5ch : front center + L + R + back stereo
366 * 6ch : front center + L + R + back stereo + LFE
367 * 7ch : front center + L + R + outer front left + outer front right + back stereo + LFE
370 if (channel_config != 2)
371 new_che_pos[TYPE_SCE][0] = AAC_CHANNEL_FRONT; // front center (or mono)
372 if (channel_config > 1)
373 new_che_pos[TYPE_CPE][0] = AAC_CHANNEL_FRONT; // L + R (or stereo)
374 if (channel_config == 4)
375 new_che_pos[TYPE_SCE][1] = AAC_CHANNEL_BACK; // back center
376 if (channel_config > 4)
377 new_che_pos[TYPE_CPE][(channel_config == 7) + 1]
378 = AAC_CHANNEL_BACK; // back stereo
379 if (channel_config > 5)
380 new_che_pos[TYPE_LFE][0] = AAC_CHANNEL_LFE; // LFE
381 if (channel_config == 7)
382 new_che_pos[TYPE_CPE][1] = AAC_CHANNEL_FRONT; // outer front left + outer front right
388 * Decode GA "General Audio" specific configuration; reference: table 4.1.
390 * @param ac pointer to AACContext, may be null
391 * @param avctx pointer to AVCCodecContext, used for logging
393 * @return Returns error status. 0 - OK, !0 - error
395 static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx,
397 MPEG4AudioConfig *m4ac,
400 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
401 int extension_flag, ret;
403 if (get_bits1(gb)) { // frameLengthFlag
404 av_log_missing_feature(avctx, "960/120 MDCT window is", 1);
408 if (get_bits1(gb)) // dependsOnCoreCoder
409 skip_bits(gb, 14); // coreCoderDelay
410 extension_flag = get_bits1(gb);
412 if (m4ac->object_type == AOT_AAC_SCALABLE ||
413 m4ac->object_type == AOT_ER_AAC_SCALABLE)
414 skip_bits(gb, 3); // layerNr
416 memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
417 if (channel_config == 0) {
418 skip_bits(gb, 4); // element_instance_tag
419 if ((ret = decode_pce(avctx, m4ac, new_che_pos, gb)))
422 if ((ret = set_default_channel_config(avctx, new_che_pos, channel_config)))
425 if (ac && (ret = output_configure(ac, ac->che_pos, new_che_pos, channel_config, OC_GLOBAL_HDR)))
428 if (extension_flag) {
429 switch (m4ac->object_type) {
431 skip_bits(gb, 5); // numOfSubFrame
432 skip_bits(gb, 11); // layer_length
436 case AOT_ER_AAC_SCALABLE:
438 skip_bits(gb, 3); /* aacSectionDataResilienceFlag
439 * aacScalefactorDataResilienceFlag
440 * aacSpectralDataResilienceFlag
444 skip_bits1(gb); // extensionFlag3 (TBD in version 3)
450 * Decode audio specific configuration; reference: table 1.13.
452 * @param ac pointer to AACContext, may be null
453 * @param avctx pointer to AVCCodecContext, used for logging
454 * @param m4ac pointer to MPEG4AudioConfig, used for parsing
455 * @param data pointer to AVCodecContext extradata
456 * @param data_size size of AVCCodecContext extradata
458 * @return Returns error status or number of consumed bits. <0 - error
460 static int decode_audio_specific_config(AACContext *ac,
461 AVCodecContext *avctx,
462 MPEG4AudioConfig *m4ac,
463 const uint8_t *data, int data_size)
468 av_dlog(avctx, "extradata size %d\n", avctx->extradata_size);
469 for (i = 0; i < avctx->extradata_size; i++)
470 av_dlog(avctx, "%02x ", avctx->extradata[i]);
471 av_dlog(avctx, "\n");
473 init_get_bits(&gb, data, data_size * 8);
475 if ((i = avpriv_mpeg4audio_get_config(m4ac, data, data_size)) < 0)
477 if (m4ac->sampling_index > 12) {
478 av_log(avctx, AV_LOG_ERROR, "invalid sampling rate index %d\n", m4ac->sampling_index);
481 if (m4ac->sbr == 1 && m4ac->ps == -1)
484 skip_bits_long(&gb, i);
486 switch (m4ac->object_type) {
490 if (decode_ga_specific_config(ac, avctx, &gb, m4ac, m4ac->chan_config))
494 av_log(avctx, AV_LOG_ERROR, "Audio object type %s%d is not supported.\n",
495 m4ac->sbr == 1? "SBR+" : "", m4ac->object_type);
499 av_dlog(avctx, "AOT %d chan config %d sampling index %d (%d) SBR %d PS %d\n",
500 m4ac->object_type, m4ac->chan_config, m4ac->sampling_index,
501 m4ac->sample_rate, m4ac->sbr, m4ac->ps);
503 return get_bits_count(&gb);
507 * linear congruential pseudorandom number generator
509 * @param previous_val pointer to the current state of the generator
511 * @return Returns a 32-bit pseudorandom integer
513 static av_always_inline int lcg_random(int previous_val)
515 return previous_val * 1664525 + 1013904223;
518 static av_always_inline void reset_predict_state(PredictorState *ps)
528 static void reset_all_predictors(PredictorState *ps)
531 for (i = 0; i < MAX_PREDICTORS; i++)
532 reset_predict_state(&ps[i]);
535 static int sample_rate_idx (int rate)
537 if (92017 <= rate) return 0;
538 else if (75132 <= rate) return 1;
539 else if (55426 <= rate) return 2;
540 else if (46009 <= rate) return 3;
541 else if (37566 <= rate) return 4;
542 else if (27713 <= rate) return 5;
543 else if (23004 <= rate) return 6;
544 else if (18783 <= rate) return 7;
545 else if (13856 <= rate) return 8;
546 else if (11502 <= rate) return 9;
547 else if (9391 <= rate) return 10;
551 static void reset_predictor_group(PredictorState *ps, int group_num)
554 for (i = group_num - 1; i < MAX_PREDICTORS; i += 30)
555 reset_predict_state(&ps[i]);
558 #define AAC_INIT_VLC_STATIC(num, size) \
559 INIT_VLC_STATIC(&vlc_spectral[num], 8, ff_aac_spectral_sizes[num], \
560 ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
561 ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
564 static av_cold int aac_decode_init(AVCodecContext *avctx)
566 AACContext *ac = avctx->priv_data;
567 float output_scale_factor;
570 ac->m4ac.sample_rate = avctx->sample_rate;
572 if (avctx->extradata_size > 0) {
573 if (decode_audio_specific_config(ac, ac->avctx, &ac->m4ac,
575 avctx->extradata_size) < 0)
579 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
581 sr = sample_rate_idx(avctx->sample_rate);
582 ac->m4ac.sampling_index = sr;
583 ac->m4ac.channels = avctx->channels;
587 for (i = 0; i < FF_ARRAY_ELEMS(ff_mpeg4audio_channels); i++)
588 if (ff_mpeg4audio_channels[i] == avctx->channels)
590 if (i == FF_ARRAY_ELEMS(ff_mpeg4audio_channels)) {
593 ac->m4ac.chan_config = i;
595 if (ac->m4ac.chan_config) {
596 int ret = set_default_channel_config(avctx, new_che_pos, ac->m4ac.chan_config);
598 output_configure(ac, ac->che_pos, new_che_pos, ac->m4ac.chan_config, OC_GLOBAL_HDR);
599 else if (avctx->err_recognition & AV_EF_EXPLODE)
600 return AVERROR_INVALIDDATA;
604 if (avctx->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
605 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
606 output_scale_factor = 1.0 / 32768.0;
608 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
609 output_scale_factor = 1.0;
612 AAC_INIT_VLC_STATIC( 0, 304);
613 AAC_INIT_VLC_STATIC( 1, 270);
614 AAC_INIT_VLC_STATIC( 2, 550);
615 AAC_INIT_VLC_STATIC( 3, 300);
616 AAC_INIT_VLC_STATIC( 4, 328);
617 AAC_INIT_VLC_STATIC( 5, 294);
618 AAC_INIT_VLC_STATIC( 6, 306);
619 AAC_INIT_VLC_STATIC( 7, 268);
620 AAC_INIT_VLC_STATIC( 8, 510);
621 AAC_INIT_VLC_STATIC( 9, 366);
622 AAC_INIT_VLC_STATIC(10, 462);
626 dsputil_init(&ac->dsp, avctx);
627 ff_fmt_convert_init(&ac->fmt_conv, avctx);
629 ac->random_state = 0x1f2e3d4c;
633 INIT_VLC_STATIC(&vlc_scalefactors,7,FF_ARRAY_ELEMS(ff_aac_scalefactor_code),
634 ff_aac_scalefactor_bits, sizeof(ff_aac_scalefactor_bits[0]), sizeof(ff_aac_scalefactor_bits[0]),
635 ff_aac_scalefactor_code, sizeof(ff_aac_scalefactor_code[0]), sizeof(ff_aac_scalefactor_code[0]),
638 ff_mdct_init(&ac->mdct, 11, 1, output_scale_factor/1024.0);
639 ff_mdct_init(&ac->mdct_small, 8, 1, output_scale_factor/128.0);
640 ff_mdct_init(&ac->mdct_ltp, 11, 0, -2.0/output_scale_factor);
641 // window initialization
642 ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
643 ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
644 ff_init_ff_sine_windows(10);
645 ff_init_ff_sine_windows( 7);
653 * Skip data_stream_element; reference: table 4.10.
655 static int skip_data_stream_element(AACContext *ac, GetBitContext *gb)
657 int byte_align = get_bits1(gb);
658 int count = get_bits(gb, 8);
660 count += get_bits(gb, 8);
664 if (get_bits_left(gb) < 8 * count) {
665 av_log(ac->avctx, AV_LOG_ERROR, overread_err);
668 skip_bits_long(gb, 8 * count);
672 static int decode_prediction(AACContext *ac, IndividualChannelStream *ics,
677 ics->predictor_reset_group = get_bits(gb, 5);
678 if (ics->predictor_reset_group == 0 || ics->predictor_reset_group > 30) {
679 av_log(ac->avctx, AV_LOG_ERROR, "Invalid Predictor Reset Group.\n");
683 for (sfb = 0; sfb < FFMIN(ics->max_sfb, ff_aac_pred_sfb_max[ac->m4ac.sampling_index]); sfb++) {
684 ics->prediction_used[sfb] = get_bits1(gb);
690 * Decode Long Term Prediction data; reference: table 4.xx.
692 static void decode_ltp(AACContext *ac, LongTermPrediction *ltp,
693 GetBitContext *gb, uint8_t max_sfb)
697 ltp->lag = get_bits(gb, 11);
698 ltp->coef = ltp_coef[get_bits(gb, 3)];
699 for (sfb = 0; sfb < FFMIN(max_sfb, MAX_LTP_LONG_SFB); sfb++)
700 ltp->used[sfb] = get_bits1(gb);
704 * Decode Individual Channel Stream info; reference: table 4.6.
706 * @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
708 static int decode_ics_info(AACContext *ac, IndividualChannelStream *ics,
709 GetBitContext *gb, int common_window)
712 av_log(ac->avctx, AV_LOG_ERROR, "Reserved bit set.\n");
713 memset(ics, 0, sizeof(IndividualChannelStream));
716 ics->window_sequence[1] = ics->window_sequence[0];
717 ics->window_sequence[0] = get_bits(gb, 2);
718 ics->use_kb_window[1] = ics->use_kb_window[0];
719 ics->use_kb_window[0] = get_bits1(gb);
720 ics->num_window_groups = 1;
721 ics->group_len[0] = 1;
722 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
724 ics->max_sfb = get_bits(gb, 4);
725 for (i = 0; i < 7; i++) {
727 ics->group_len[ics->num_window_groups - 1]++;
729 ics->num_window_groups++;
730 ics->group_len[ics->num_window_groups - 1] = 1;
733 ics->num_windows = 8;
734 ics->swb_offset = ff_swb_offset_128[ac->m4ac.sampling_index];
735 ics->num_swb = ff_aac_num_swb_128[ac->m4ac.sampling_index];
736 ics->tns_max_bands = ff_tns_max_bands_128[ac->m4ac.sampling_index];
737 ics->predictor_present = 0;
739 ics->max_sfb = get_bits(gb, 6);
740 ics->num_windows = 1;
741 ics->swb_offset = ff_swb_offset_1024[ac->m4ac.sampling_index];
742 ics->num_swb = ff_aac_num_swb_1024[ac->m4ac.sampling_index];
743 ics->tns_max_bands = ff_tns_max_bands_1024[ac->m4ac.sampling_index];
744 ics->predictor_present = get_bits1(gb);
745 ics->predictor_reset_group = 0;
746 if (ics->predictor_present) {
747 if (ac->m4ac.object_type == AOT_AAC_MAIN) {
748 if (decode_prediction(ac, ics, gb)) {
749 memset(ics, 0, sizeof(IndividualChannelStream));
752 } else if (ac->m4ac.object_type == AOT_AAC_LC) {
753 av_log(ac->avctx, AV_LOG_ERROR, "Prediction is not allowed in AAC-LC.\n");
754 memset(ics, 0, sizeof(IndividualChannelStream));
757 if ((ics->ltp.present = get_bits(gb, 1)))
758 decode_ltp(ac, &ics->ltp, gb, ics->max_sfb);
763 if (ics->max_sfb > ics->num_swb) {
764 av_log(ac->avctx, AV_LOG_ERROR,
765 "Number of scalefactor bands in group (%d) exceeds limit (%d).\n",
766 ics->max_sfb, ics->num_swb);
767 memset(ics, 0, sizeof(IndividualChannelStream));
775 * Decode band types (section_data payload); reference: table 4.46.
777 * @param band_type array of the used band type
778 * @param band_type_run_end array of the last scalefactor band of a band type run
780 * @return Returns error status. 0 - OK, !0 - error
782 static int decode_band_types(AACContext *ac, enum BandType band_type[120],
783 int band_type_run_end[120], GetBitContext *gb,
784 IndividualChannelStream *ics)
787 const int bits = (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) ? 3 : 5;
788 for (g = 0; g < ics->num_window_groups; g++) {
790 while (k < ics->max_sfb) {
791 uint8_t sect_end = k;
793 int sect_band_type = get_bits(gb, 4);
794 if (sect_band_type == 12) {
795 av_log(ac->avctx, AV_LOG_ERROR, "invalid band type\n");
798 while ((sect_len_incr = get_bits(gb, bits)) == (1 << bits) - 1)
799 sect_end += sect_len_incr;
800 sect_end += sect_len_incr;
801 if (get_bits_left(gb) < 0) {
802 av_log(ac->avctx, AV_LOG_ERROR, overread_err);
805 if (sect_end > ics->max_sfb) {
806 av_log(ac->avctx, AV_LOG_ERROR,
807 "Number of bands (%d) exceeds limit (%d).\n",
808 sect_end, ics->max_sfb);
811 for (; k < sect_end; k++) {
812 band_type [idx] = sect_band_type;
813 band_type_run_end[idx++] = sect_end;
821 * Decode scalefactors; reference: table 4.47.
823 * @param global_gain first scalefactor value as scalefactors are differentially coded
824 * @param band_type array of the used band type
825 * @param band_type_run_end array of the last scalefactor band of a band type run
826 * @param sf array of scalefactors or intensity stereo positions
828 * @return Returns error status. 0 - OK, !0 - error
830 static int decode_scalefactors(AACContext *ac, float sf[120], GetBitContext *gb,
831 unsigned int global_gain,
832 IndividualChannelStream *ics,
833 enum BandType band_type[120],
834 int band_type_run_end[120])
837 int offset[3] = { global_gain, global_gain - 90, 0 };
840 static const char *sf_str[3] = { "Global gain", "Noise gain", "Intensity stereo position" };
841 for (g = 0; g < ics->num_window_groups; g++) {
842 for (i = 0; i < ics->max_sfb;) {
843 int run_end = band_type_run_end[idx];
844 if (band_type[idx] == ZERO_BT) {
845 for (; i < run_end; i++, idx++)
847 } else if ((band_type[idx] == INTENSITY_BT) || (band_type[idx] == INTENSITY_BT2)) {
848 for (; i < run_end; i++, idx++) {
849 offset[2] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
850 clipped_offset = av_clip(offset[2], -155, 100);
851 if (offset[2] != clipped_offset) {
852 av_log_ask_for_sample(ac->avctx, "Intensity stereo "
853 "position clipped (%d -> %d).\nIf you heard an "
854 "audible artifact, there may be a bug in the "
855 "decoder. ", offset[2], clipped_offset);
857 sf[idx] = ff_aac_pow2sf_tab[-clipped_offset + POW_SF2_ZERO];
859 } else if (band_type[idx] == NOISE_BT) {
860 for (; i < run_end; i++, idx++) {
861 if (noise_flag-- > 0)
862 offset[1] += get_bits(gb, 9) - 256;
864 offset[1] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
865 clipped_offset = av_clip(offset[1], -100, 155);
866 if (offset[1] != clipped_offset) {
867 av_log_ask_for_sample(ac->avctx, "Noise gain clipped "
868 "(%d -> %d).\nIf you heard an audible "
869 "artifact, there may be a bug in the decoder. ",
870 offset[1], clipped_offset);
872 sf[idx] = -ff_aac_pow2sf_tab[clipped_offset + POW_SF2_ZERO];
875 for (; i < run_end; i++, idx++) {
876 offset[0] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
877 if (offset[0] > 255U) {
878 av_log(ac->avctx, AV_LOG_ERROR,
879 "%s (%d) out of range.\n", sf_str[0], offset[0]);
882 sf[idx] = -ff_aac_pow2sf_tab[offset[0] - 100 + POW_SF2_ZERO];
891 * Decode pulse data; reference: table 4.7.
893 static int decode_pulses(Pulse *pulse, GetBitContext *gb,
894 const uint16_t *swb_offset, int num_swb)
897 pulse->num_pulse = get_bits(gb, 2) + 1;
898 pulse_swb = get_bits(gb, 6);
899 if (pulse_swb >= num_swb)
901 pulse->pos[0] = swb_offset[pulse_swb];
902 pulse->pos[0] += get_bits(gb, 5);
903 if (pulse->pos[0] > 1023)
905 pulse->amp[0] = get_bits(gb, 4);
906 for (i = 1; i < pulse->num_pulse; i++) {
907 pulse->pos[i] = get_bits(gb, 5) + pulse->pos[i - 1];
908 if (pulse->pos[i] > 1023)
910 pulse->amp[i] = get_bits(gb, 4);
916 * Decode Temporal Noise Shaping data; reference: table 4.48.
918 * @return Returns error status. 0 - OK, !0 - error
920 static int decode_tns(AACContext *ac, TemporalNoiseShaping *tns,
921 GetBitContext *gb, const IndividualChannelStream *ics)
923 int w, filt, i, coef_len, coef_res, coef_compress;
924 const int is8 = ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE;
925 const int tns_max_order = is8 ? 7 : ac->m4ac.object_type == AOT_AAC_MAIN ? 20 : 12;
926 for (w = 0; w < ics->num_windows; w++) {
927 if ((tns->n_filt[w] = get_bits(gb, 2 - is8))) {
928 coef_res = get_bits1(gb);
930 for (filt = 0; filt < tns->n_filt[w]; filt++) {
932 tns->length[w][filt] = get_bits(gb, 6 - 2 * is8);
934 if ((tns->order[w][filt] = get_bits(gb, 5 - 2 * is8)) > tns_max_order) {
935 av_log(ac->avctx, AV_LOG_ERROR, "TNS filter order %d is greater than maximum %d.\n",
936 tns->order[w][filt], tns_max_order);
937 tns->order[w][filt] = 0;
940 if (tns->order[w][filt]) {
941 tns->direction[w][filt] = get_bits1(gb);
942 coef_compress = get_bits1(gb);
943 coef_len = coef_res + 3 - coef_compress;
944 tmp2_idx = 2 * coef_compress + coef_res;
946 for (i = 0; i < tns->order[w][filt]; i++)
947 tns->coef[w][filt][i] = tns_tmp2_map[tmp2_idx][get_bits(gb, coef_len)];
956 * Decode Mid/Side data; reference: table 4.54.
958 * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
959 * [1] mask is decoded from bitstream; [2] mask is all 1s;
960 * [3] reserved for scalable AAC
962 static void decode_mid_side_stereo(ChannelElement *cpe, GetBitContext *gb,
966 if (ms_present == 1) {
967 for (idx = 0; idx < cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb; idx++)
968 cpe->ms_mask[idx] = get_bits1(gb);
969 } else if (ms_present == 2) {
970 memset(cpe->ms_mask, 1, cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb * sizeof(cpe->ms_mask[0]));
975 static inline float *VMUL2(float *dst, const float *v, unsigned idx,
979 *dst++ = v[idx & 15] * s;
980 *dst++ = v[idx>>4 & 15] * s;
986 static inline float *VMUL4(float *dst, const float *v, unsigned idx,
990 *dst++ = v[idx & 3] * s;
991 *dst++ = v[idx>>2 & 3] * s;
992 *dst++ = v[idx>>4 & 3] * s;
993 *dst++ = v[idx>>6 & 3] * s;
999 static inline float *VMUL2S(float *dst, const float *v, unsigned idx,
1000 unsigned sign, const float *scale)
1002 union float754 s0, s1;
1004 s0.f = s1.f = *scale;
1005 s0.i ^= sign >> 1 << 31;
1008 *dst++ = v[idx & 15] * s0.f;
1009 *dst++ = v[idx>>4 & 15] * s1.f;
1016 static inline float *VMUL4S(float *dst, const float *v, unsigned idx,
1017 unsigned sign, const float *scale)
1019 unsigned nz = idx >> 12;
1020 union float754 s = { .f = *scale };
1023 t.i = s.i ^ (sign & 1U<<31);
1024 *dst++ = v[idx & 3] * t.f;
1026 sign <<= nz & 1; nz >>= 1;
1027 t.i = s.i ^ (sign & 1U<<31);
1028 *dst++ = v[idx>>2 & 3] * t.f;
1030 sign <<= nz & 1; nz >>= 1;
1031 t.i = s.i ^ (sign & 1U<<31);
1032 *dst++ = v[idx>>4 & 3] * t.f;
1034 sign <<= nz & 1; nz >>= 1;
1035 t.i = s.i ^ (sign & 1U<<31);
1036 *dst++ = v[idx>>6 & 3] * t.f;
1043 * Decode spectral data; reference: table 4.50.
1044 * Dequantize and scale spectral data; reference: 4.6.3.3.
1046 * @param coef array of dequantized, scaled spectral data
1047 * @param sf array of scalefactors or intensity stereo positions
1048 * @param pulse_present set if pulses are present
1049 * @param pulse pointer to pulse data struct
1050 * @param band_type array of the used band type
1052 * @return Returns error status. 0 - OK, !0 - error
1054 static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
1055 GetBitContext *gb, const float sf[120],
1056 int pulse_present, const Pulse *pulse,
1057 const IndividualChannelStream *ics,
1058 enum BandType band_type[120])
1060 int i, k, g, idx = 0;
1061 const int c = 1024 / ics->num_windows;
1062 const uint16_t *offsets = ics->swb_offset;
1063 float *coef_base = coef;
1065 for (g = 0; g < ics->num_windows; g++)
1066 memset(coef + g * 128 + offsets[ics->max_sfb], 0, sizeof(float) * (c - offsets[ics->max_sfb]));
1068 for (g = 0; g < ics->num_window_groups; g++) {
1069 unsigned g_len = ics->group_len[g];
1071 for (i = 0; i < ics->max_sfb; i++, idx++) {
1072 const unsigned cbt_m1 = band_type[idx] - 1;
1073 float *cfo = coef + offsets[i];
1074 int off_len = offsets[i + 1] - offsets[i];
1077 if (cbt_m1 >= INTENSITY_BT2 - 1) {
1078 for (group = 0; group < g_len; group++, cfo+=128) {
1079 memset(cfo, 0, off_len * sizeof(float));
1081 } else if (cbt_m1 == NOISE_BT - 1) {
1082 for (group = 0; group < g_len; group++, cfo+=128) {
1086 for (k = 0; k < off_len; k++) {
1087 ac->random_state = lcg_random(ac->random_state);
1088 cfo[k] = ac->random_state;
1091 band_energy = ac->dsp.scalarproduct_float(cfo, cfo, off_len);
1092 scale = sf[idx] / sqrtf(band_energy);
1093 ac->dsp.vector_fmul_scalar(cfo, cfo, scale, off_len);
1096 const float *vq = ff_aac_codebook_vector_vals[cbt_m1];
1097 const uint16_t *cb_vector_idx = ff_aac_codebook_vector_idx[cbt_m1];
1098 VLC_TYPE (*vlc_tab)[2] = vlc_spectral[cbt_m1].table;
1099 OPEN_READER(re, gb);
1101 switch (cbt_m1 >> 1) {
1103 for (group = 0; group < g_len; group++, cfo+=128) {
1111 UPDATE_CACHE(re, gb);
1112 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1113 cb_idx = cb_vector_idx[code];
1114 cf = VMUL4(cf, vq, cb_idx, sf + idx);
1120 for (group = 0; group < g_len; group++, cfo+=128) {
1130 UPDATE_CACHE(re, gb);
1131 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1132 cb_idx = cb_vector_idx[code];
1133 nnz = cb_idx >> 8 & 15;
1134 bits = nnz ? GET_CACHE(re, gb) : 0;
1135 LAST_SKIP_BITS(re, gb, nnz);
1136 cf = VMUL4S(cf, vq, cb_idx, bits, sf + idx);
1142 for (group = 0; group < g_len; group++, cfo+=128) {
1150 UPDATE_CACHE(re, gb);
1151 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1152 cb_idx = cb_vector_idx[code];
1153 cf = VMUL2(cf, vq, cb_idx, sf + idx);
1160 for (group = 0; group < g_len; group++, cfo+=128) {
1170 UPDATE_CACHE(re, gb);
1171 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1172 cb_idx = cb_vector_idx[code];
1173 nnz = cb_idx >> 8 & 15;
1174 sign = nnz ? SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12) : 0;
1175 LAST_SKIP_BITS(re, gb, nnz);
1176 cf = VMUL2S(cf, vq, cb_idx, sign, sf + idx);
1182 for (group = 0; group < g_len; group++, cfo+=128) {
1184 uint32_t *icf = (uint32_t *) cf;
1194 UPDATE_CACHE(re, gb);
1195 GET_VLC(code, re, gb, vlc_tab, 8, 2);
1203 cb_idx = cb_vector_idx[code];
1206 bits = SHOW_UBITS(re, gb, nnz) << (32-nnz);
1207 LAST_SKIP_BITS(re, gb, nnz);
1209 for (j = 0; j < 2; j++) {
1213 /* The total length of escape_sequence must be < 22 bits according
1214 to the specification (i.e. max is 111111110xxxxxxxxxxxx). */
1215 UPDATE_CACHE(re, gb);
1216 b = GET_CACHE(re, gb);
1217 b = 31 - av_log2(~b);
1220 av_log(ac->avctx, AV_LOG_ERROR, "error in spectral data, ESC overflow\n");
1224 SKIP_BITS(re, gb, b + 1);
1226 n = (1 << b) + SHOW_UBITS(re, gb, b);
1227 LAST_SKIP_BITS(re, gb, b);
1228 *icf++ = cbrt_tab[n] | (bits & 1U<<31);
1231 unsigned v = ((const uint32_t*)vq)[cb_idx & 15];
1232 *icf++ = (bits & 1U<<31) | v;
1239 ac->dsp.vector_fmul_scalar(cfo, cfo, sf[idx], off_len);
1243 CLOSE_READER(re, gb);
1249 if (pulse_present) {
1251 for (i = 0; i < pulse->num_pulse; i++) {
1252 float co = coef_base[ pulse->pos[i] ];
1253 while (offsets[idx + 1] <= pulse->pos[i])
1255 if (band_type[idx] != NOISE_BT && sf[idx]) {
1256 float ico = -pulse->amp[i];
1259 ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico);
1261 coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx];
1268 static av_always_inline float flt16_round(float pf)
1272 tmp.i = (tmp.i + 0x00008000U) & 0xFFFF0000U;
1276 static av_always_inline float flt16_even(float pf)
1280 tmp.i = (tmp.i + 0x00007FFFU + (tmp.i & 0x00010000U >> 16)) & 0xFFFF0000U;
1284 static av_always_inline float flt16_trunc(float pf)
1288 pun.i &= 0xFFFF0000U;
1292 static av_always_inline void predict(PredictorState *ps, float *coef,
1295 const float a = 0.953125; // 61.0 / 64
1296 const float alpha = 0.90625; // 29.0 / 32
1300 float r0 = ps->r0, r1 = ps->r1;
1301 float cor0 = ps->cor0, cor1 = ps->cor1;
1302 float var0 = ps->var0, var1 = ps->var1;
1304 k1 = var0 > 1 ? cor0 * flt16_even(a / var0) : 0;
1305 k2 = var1 > 1 ? cor1 * flt16_even(a / var1) : 0;
1307 pv = flt16_round(k1 * r0 + k2 * r1);
1314 ps->cor1 = flt16_trunc(alpha * cor1 + r1 * e1);
1315 ps->var1 = flt16_trunc(alpha * var1 + 0.5f * (r1 * r1 + e1 * e1));
1316 ps->cor0 = flt16_trunc(alpha * cor0 + r0 * e0);
1317 ps->var0 = flt16_trunc(alpha * var0 + 0.5f * (r0 * r0 + e0 * e0));
1319 ps->r1 = flt16_trunc(a * (r0 - k1 * e0));
1320 ps->r0 = flt16_trunc(a * e0);
1324 * Apply AAC-Main style frequency domain prediction.
1326 static void apply_prediction(AACContext *ac, SingleChannelElement *sce)
1330 if (!sce->ics.predictor_initialized) {
1331 reset_all_predictors(sce->predictor_state);
1332 sce->ics.predictor_initialized = 1;
1335 if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
1336 for (sfb = 0; sfb < ff_aac_pred_sfb_max[ac->m4ac.sampling_index]; sfb++) {
1337 for (k = sce->ics.swb_offset[sfb]; k < sce->ics.swb_offset[sfb + 1]; k++) {
1338 predict(&sce->predictor_state[k], &sce->coeffs[k],
1339 sce->ics.predictor_present && sce->ics.prediction_used[sfb]);
1342 if (sce->ics.predictor_reset_group)
1343 reset_predictor_group(sce->predictor_state, sce->ics.predictor_reset_group);
1345 reset_all_predictors(sce->predictor_state);
1349 * Decode an individual_channel_stream payload; reference: table 4.44.
1351 * @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
1352 * @param scale_flag scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.)
1354 * @return Returns error status. 0 - OK, !0 - error
1356 static int decode_ics(AACContext *ac, SingleChannelElement *sce,
1357 GetBitContext *gb, int common_window, int scale_flag)
1360 TemporalNoiseShaping *tns = &sce->tns;
1361 IndividualChannelStream *ics = &sce->ics;
1362 float *out = sce->coeffs;
1363 int global_gain, pulse_present = 0;
1365 /* This assignment is to silence a GCC warning about the variable being used
1366 * uninitialized when in fact it always is.
1368 pulse.num_pulse = 0;
1370 global_gain = get_bits(gb, 8);
1372 if (!common_window && !scale_flag) {
1373 if (decode_ics_info(ac, ics, gb, 0) < 0)
1377 if (decode_band_types(ac, sce->band_type, sce->band_type_run_end, gb, ics) < 0)
1379 if (decode_scalefactors(ac, sce->sf, gb, global_gain, ics, sce->band_type, sce->band_type_run_end) < 0)
1384 if ((pulse_present = get_bits1(gb))) {
1385 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1386 av_log(ac->avctx, AV_LOG_ERROR, "Pulse tool not allowed in eight short sequence.\n");
1389 if (decode_pulses(&pulse, gb, ics->swb_offset, ics->num_swb)) {
1390 av_log(ac->avctx, AV_LOG_ERROR, "Pulse data corrupt or invalid.\n");
1394 if ((tns->present = get_bits1(gb)) && decode_tns(ac, tns, gb, ics))
1396 if (get_bits1(gb)) {
1397 av_log_missing_feature(ac->avctx, "SSR", 1);
1402 if (decode_spectrum_and_dequant(ac, out, gb, sce->sf, pulse_present, &pulse, ics, sce->band_type) < 0)
1405 if (ac->m4ac.object_type == AOT_AAC_MAIN && !common_window)
1406 apply_prediction(ac, sce);
1412 * Mid/Side stereo decoding; reference: 4.6.8.1.3.
1414 static void apply_mid_side_stereo(AACContext *ac, ChannelElement *cpe)
1416 const IndividualChannelStream *ics = &cpe->ch[0].ics;
1417 float *ch0 = cpe->ch[0].coeffs;
1418 float *ch1 = cpe->ch[1].coeffs;
1419 int g, i, group, idx = 0;
1420 const uint16_t *offsets = ics->swb_offset;
1421 for (g = 0; g < ics->num_window_groups; g++) {
1422 for (i = 0; i < ics->max_sfb; i++, idx++) {
1423 if (cpe->ms_mask[idx] &&
1424 cpe->ch[0].band_type[idx] < NOISE_BT && cpe->ch[1].band_type[idx] < NOISE_BT) {
1425 for (group = 0; group < ics->group_len[g]; group++) {
1426 ac->dsp.butterflies_float(ch0 + group * 128 + offsets[i],
1427 ch1 + group * 128 + offsets[i],
1428 offsets[i+1] - offsets[i]);
1432 ch0 += ics->group_len[g] * 128;
1433 ch1 += ics->group_len[g] * 128;
1438 * intensity stereo decoding; reference: 4.6.8.2.3
1440 * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
1441 * [1] mask is decoded from bitstream; [2] mask is all 1s;
1442 * [3] reserved for scalable AAC
1444 static void apply_intensity_stereo(AACContext *ac, ChannelElement *cpe, int ms_present)
1446 const IndividualChannelStream *ics = &cpe->ch[1].ics;
1447 SingleChannelElement *sce1 = &cpe->ch[1];
1448 float *coef0 = cpe->ch[0].coeffs, *coef1 = cpe->ch[1].coeffs;
1449 const uint16_t *offsets = ics->swb_offset;
1450 int g, group, i, idx = 0;
1453 for (g = 0; g < ics->num_window_groups; g++) {
1454 for (i = 0; i < ics->max_sfb;) {
1455 if (sce1->band_type[idx] == INTENSITY_BT || sce1->band_type[idx] == INTENSITY_BT2) {
1456 const int bt_run_end = sce1->band_type_run_end[idx];
1457 for (; i < bt_run_end; i++, idx++) {
1458 c = -1 + 2 * (sce1->band_type[idx] - 14);
1460 c *= 1 - 2 * cpe->ms_mask[idx];
1461 scale = c * sce1->sf[idx];
1462 for (group = 0; group < ics->group_len[g]; group++)
1463 ac->dsp.vector_fmul_scalar(coef1 + group * 128 + offsets[i],
1464 coef0 + group * 128 + offsets[i],
1466 offsets[i + 1] - offsets[i]);
1469 int bt_run_end = sce1->band_type_run_end[idx];
1470 idx += bt_run_end - i;
1474 coef0 += ics->group_len[g] * 128;
1475 coef1 += ics->group_len[g] * 128;
1480 * Decode a channel_pair_element; reference: table 4.4.
1482 * @return Returns error status. 0 - OK, !0 - error
1484 static int decode_cpe(AACContext *ac, GetBitContext *gb, ChannelElement *cpe)
1486 int i, ret, common_window, ms_present = 0;
1488 common_window = get_bits1(gb);
1489 if (common_window) {
1490 if (decode_ics_info(ac, &cpe->ch[0].ics, gb, 1))
1492 i = cpe->ch[1].ics.use_kb_window[0];
1493 cpe->ch[1].ics = cpe->ch[0].ics;
1494 cpe->ch[1].ics.use_kb_window[1] = i;
1495 if (cpe->ch[1].ics.predictor_present && (ac->m4ac.object_type != AOT_AAC_MAIN))
1496 if ((cpe->ch[1].ics.ltp.present = get_bits(gb, 1)))
1497 decode_ltp(ac, &cpe->ch[1].ics.ltp, gb, cpe->ch[1].ics.max_sfb);
1498 ms_present = get_bits(gb, 2);
1499 if (ms_present == 3) {
1500 av_log(ac->avctx, AV_LOG_ERROR, "ms_present = 3 is reserved.\n");
1502 } else if (ms_present)
1503 decode_mid_side_stereo(cpe, gb, ms_present);
1505 if ((ret = decode_ics(ac, &cpe->ch[0], gb, common_window, 0)))
1507 if ((ret = decode_ics(ac, &cpe->ch[1], gb, common_window, 0)))
1510 if (common_window) {
1512 apply_mid_side_stereo(ac, cpe);
1513 if (ac->m4ac.object_type == AOT_AAC_MAIN) {
1514 apply_prediction(ac, &cpe->ch[0]);
1515 apply_prediction(ac, &cpe->ch[1]);
1519 apply_intensity_stereo(ac, cpe, ms_present);
1523 static const float cce_scale[] = {
1524 1.09050773266525765921, //2^(1/8)
1525 1.18920711500272106672, //2^(1/4)
1531 * Decode coupling_channel_element; reference: table 4.8.
1533 * @return Returns error status. 0 - OK, !0 - error
1535 static int decode_cce(AACContext *ac, GetBitContext *gb, ChannelElement *che)
1541 SingleChannelElement *sce = &che->ch[0];
1542 ChannelCoupling *coup = &che->coup;
1544 coup->coupling_point = 2 * get_bits1(gb);
1545 coup->num_coupled = get_bits(gb, 3);
1546 for (c = 0; c <= coup->num_coupled; c++) {
1548 coup->type[c] = get_bits1(gb) ? TYPE_CPE : TYPE_SCE;
1549 coup->id_select[c] = get_bits(gb, 4);
1550 if (coup->type[c] == TYPE_CPE) {
1551 coup->ch_select[c] = get_bits(gb, 2);
1552 if (coup->ch_select[c] == 3)
1555 coup->ch_select[c] = 2;
1557 coup->coupling_point += get_bits1(gb) || (coup->coupling_point >> 1);
1559 sign = get_bits(gb, 1);
1560 scale = cce_scale[get_bits(gb, 2)];
1562 if ((ret = decode_ics(ac, sce, gb, 0, 0)))
1565 for (c = 0; c < num_gain; c++) {
1569 float gain_cache = 1.;
1571 cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb);
1572 gain = cge ? get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60: 0;
1573 gain_cache = powf(scale, -gain);
1575 if (coup->coupling_point == AFTER_IMDCT) {
1576 coup->gain[c][0] = gain_cache;
1578 for (g = 0; g < sce->ics.num_window_groups; g++) {
1579 for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) {
1580 if (sce->band_type[idx] != ZERO_BT) {
1582 int t = get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
1590 gain_cache = powf(scale, -t) * s;
1593 coup->gain[c][idx] = gain_cache;
1603 * Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
1605 * @return Returns number of bytes consumed.
1607 static int decode_drc_channel_exclusions(DynamicRangeControl *che_drc,
1611 int num_excl_chan = 0;
1614 for (i = 0; i < 7; i++)
1615 che_drc->exclude_mask[num_excl_chan++] = get_bits1(gb);
1616 } while (num_excl_chan < MAX_CHANNELS - 7 && get_bits1(gb));
1618 return num_excl_chan / 7;
1622 * Decode dynamic range information; reference: table 4.52.
1624 * @param cnt length of TYPE_FIL syntactic element in bytes
1626 * @return Returns number of bytes consumed.
1628 static int decode_dynamic_range(DynamicRangeControl *che_drc,
1629 GetBitContext *gb, int cnt)
1632 int drc_num_bands = 1;
1635 /* pce_tag_present? */
1636 if (get_bits1(gb)) {
1637 che_drc->pce_instance_tag = get_bits(gb, 4);
1638 skip_bits(gb, 4); // tag_reserved_bits
1642 /* excluded_chns_present? */
1643 if (get_bits1(gb)) {
1644 n += decode_drc_channel_exclusions(che_drc, gb);
1647 /* drc_bands_present? */
1648 if (get_bits1(gb)) {
1649 che_drc->band_incr = get_bits(gb, 4);
1650 che_drc->interpolation_scheme = get_bits(gb, 4);
1652 drc_num_bands += che_drc->band_incr;
1653 for (i = 0; i < drc_num_bands; i++) {
1654 che_drc->band_top[i] = get_bits(gb, 8);
1659 /* prog_ref_level_present? */
1660 if (get_bits1(gb)) {
1661 che_drc->prog_ref_level = get_bits(gb, 7);
1662 skip_bits1(gb); // prog_ref_level_reserved_bits
1666 for (i = 0; i < drc_num_bands; i++) {
1667 che_drc->dyn_rng_sgn[i] = get_bits1(gb);
1668 che_drc->dyn_rng_ctl[i] = get_bits(gb, 7);
1676 * Decode extension data (incomplete); reference: table 4.51.
1678 * @param cnt length of TYPE_FIL syntactic element in bytes
1680 * @return Returns number of bytes consumed
1682 static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt,
1683 ChannelElement *che, enum RawDataBlockType elem_type)
1687 switch (get_bits(gb, 4)) { // extension type
1688 case EXT_SBR_DATA_CRC:
1692 av_log(ac->avctx, AV_LOG_ERROR, "SBR was found before the first channel element.\n");
1694 } else if (!ac->m4ac.sbr) {
1695 av_log(ac->avctx, AV_LOG_ERROR, "SBR signaled to be not-present but was found in the bitstream.\n");
1696 skip_bits_long(gb, 8 * cnt - 4);
1698 } else if (ac->m4ac.sbr == -1 && ac->output_configured == OC_LOCKED) {
1699 av_log(ac->avctx, AV_LOG_ERROR, "Implicit SBR was found with a first occurrence after the first frame.\n");
1700 skip_bits_long(gb, 8 * cnt - 4);
1702 } else if (ac->m4ac.ps == -1 && ac->output_configured < OC_LOCKED && ac->avctx->channels == 1) {
1705 output_configure(ac, ac->che_pos, ac->che_pos, ac->m4ac.chan_config, ac->output_configured);
1709 res = ff_decode_sbr_extension(ac, &che->sbr, gb, crc_flag, cnt, elem_type);
1711 case EXT_DYNAMIC_RANGE:
1712 res = decode_dynamic_range(&ac->che_drc, gb, cnt);
1716 case EXT_DATA_ELEMENT:
1718 skip_bits_long(gb, 8 * cnt - 4);
1725 * Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
1727 * @param decode 1 if tool is used normally, 0 if tool is used in LTP.
1728 * @param coef spectral coefficients
1730 static void apply_tns(float coef[1024], TemporalNoiseShaping *tns,
1731 IndividualChannelStream *ics, int decode)
1733 const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
1735 int bottom, top, order, start, end, size, inc;
1736 float lpc[TNS_MAX_ORDER];
1737 float tmp[TNS_MAX_ORDER];
1739 for (w = 0; w < ics->num_windows; w++) {
1740 bottom = ics->num_swb;
1741 for (filt = 0; filt < tns->n_filt[w]; filt++) {
1743 bottom = FFMAX(0, top - tns->length[w][filt]);
1744 order = tns->order[w][filt];
1749 compute_lpc_coefs(tns->coef[w][filt], order, lpc, 0, 0, 0);
1751 start = ics->swb_offset[FFMIN(bottom, mmm)];
1752 end = ics->swb_offset[FFMIN( top, mmm)];
1753 if ((size = end - start) <= 0)
1755 if (tns->direction[w][filt]) {
1765 for (m = 0; m < size; m++, start += inc)
1766 for (i = 1; i <= FFMIN(m, order); i++)
1767 coef[start] -= coef[start - i * inc] * lpc[i - 1];
1770 for (m = 0; m < size; m++, start += inc) {
1771 tmp[0] = coef[start];
1772 for (i = 1; i <= FFMIN(m, order); i++)
1773 coef[start] += tmp[i] * lpc[i - 1];
1774 for (i = order; i > 0; i--)
1775 tmp[i] = tmp[i - 1];
1783 * Apply windowing and MDCT to obtain the spectral
1784 * coefficient from the predicted sample by LTP.
1786 static void windowing_and_mdct_ltp(AACContext *ac, float *out,
1787 float *in, IndividualChannelStream *ics)
1789 const float *lwindow = ics->use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
1790 const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
1791 const float *lwindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
1792 const float *swindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
1794 if (ics->window_sequence[0] != LONG_STOP_SEQUENCE) {
1795 ac->dsp.vector_fmul(in, in, lwindow_prev, 1024);
1797 memset(in, 0, 448 * sizeof(float));
1798 ac->dsp.vector_fmul(in + 448, in + 448, swindow_prev, 128);
1800 if (ics->window_sequence[0] != LONG_START_SEQUENCE) {
1801 ac->dsp.vector_fmul_reverse(in + 1024, in + 1024, lwindow, 1024);
1803 ac->dsp.vector_fmul_reverse(in + 1024 + 448, in + 1024 + 448, swindow, 128);
1804 memset(in + 1024 + 576, 0, 448 * sizeof(float));
1806 ac->mdct_ltp.mdct_calc(&ac->mdct_ltp, out, in);
1810 * Apply the long term prediction
1812 static void apply_ltp(AACContext *ac, SingleChannelElement *sce)
1814 const LongTermPrediction *ltp = &sce->ics.ltp;
1815 const uint16_t *offsets = sce->ics.swb_offset;
1818 if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
1819 float *predTime = sce->ret;
1820 float *predFreq = ac->buf_mdct;
1821 int16_t num_samples = 2048;
1823 if (ltp->lag < 1024)
1824 num_samples = ltp->lag + 1024;
1825 for (i = 0; i < num_samples; i++)
1826 predTime[i] = sce->ltp_state[i + 2048 - ltp->lag] * ltp->coef;
1827 memset(&predTime[i], 0, (2048 - i) * sizeof(float));
1829 windowing_and_mdct_ltp(ac, predFreq, predTime, &sce->ics);
1831 if (sce->tns.present)
1832 apply_tns(predFreq, &sce->tns, &sce->ics, 0);
1834 for (sfb = 0; sfb < FFMIN(sce->ics.max_sfb, MAX_LTP_LONG_SFB); sfb++)
1836 for (i = offsets[sfb]; i < offsets[sfb + 1]; i++)
1837 sce->coeffs[i] += predFreq[i];
1842 * Update the LTP buffer for next frame
1844 static void update_ltp(AACContext *ac, SingleChannelElement *sce)
1846 IndividualChannelStream *ics = &sce->ics;
1847 float *saved = sce->saved;
1848 float *saved_ltp = sce->coeffs;
1849 const float *lwindow = ics->use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
1850 const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
1853 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1854 memcpy(saved_ltp, saved, 512 * sizeof(float));
1855 memset(saved_ltp + 576, 0, 448 * sizeof(float));
1856 ac->dsp.vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64);
1857 for (i = 0; i < 64; i++)
1858 saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * swindow[63 - i];
1859 } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
1860 memcpy(saved_ltp, ac->buf_mdct + 512, 448 * sizeof(float));
1861 memset(saved_ltp + 576, 0, 448 * sizeof(float));
1862 ac->dsp.vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64);
1863 for (i = 0; i < 64; i++)
1864 saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * swindow[63 - i];
1865 } else { // LONG_STOP or ONLY_LONG
1866 ac->dsp.vector_fmul_reverse(saved_ltp, ac->buf_mdct + 512, &lwindow[512], 512);
1867 for (i = 0; i < 512; i++)
1868 saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * lwindow[511 - i];
1871 memcpy(sce->ltp_state, sce->ltp_state+1024, 1024 * sizeof(*sce->ltp_state));
1872 memcpy(sce->ltp_state+1024, sce->ret, 1024 * sizeof(*sce->ltp_state));
1873 memcpy(sce->ltp_state+2048, saved_ltp, 1024 * sizeof(*sce->ltp_state));
1877 * Conduct IMDCT and windowing.
1879 static void imdct_and_windowing(AACContext *ac, SingleChannelElement *sce)
1881 IndividualChannelStream *ics = &sce->ics;
1882 float *in = sce->coeffs;
1883 float *out = sce->ret;
1884 float *saved = sce->saved;
1885 const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
1886 const float *lwindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
1887 const float *swindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
1888 float *buf = ac->buf_mdct;
1889 float *temp = ac->temp;
1893 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1894 for (i = 0; i < 1024; i += 128)
1895 ac->mdct_small.imdct_half(&ac->mdct_small, buf + i, in + i);
1897 ac->mdct.imdct_half(&ac->mdct, buf, in);
1899 /* window overlapping
1900 * NOTE: To simplify the overlapping code, all 'meaningless' short to long
1901 * and long to short transitions are considered to be short to short
1902 * transitions. This leaves just two cases (long to long and short to short)
1903 * with a little special sauce for EIGHT_SHORT_SEQUENCE.
1905 if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) &&
1906 (ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) {
1907 ac->dsp.vector_fmul_window( out, saved, buf, lwindow_prev, 512);
1909 memcpy( out, saved, 448 * sizeof(float));
1911 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1912 ac->dsp.vector_fmul_window(out + 448 + 0*128, saved + 448, buf + 0*128, swindow_prev, 64);
1913 ac->dsp.vector_fmul_window(out + 448 + 1*128, buf + 0*128 + 64, buf + 1*128, swindow, 64);
1914 ac->dsp.vector_fmul_window(out + 448 + 2*128, buf + 1*128 + 64, buf + 2*128, swindow, 64);
1915 ac->dsp.vector_fmul_window(out + 448 + 3*128, buf + 2*128 + 64, buf + 3*128, swindow, 64);
1916 ac->dsp.vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, swindow, 64);
1917 memcpy( out + 448 + 4*128, temp, 64 * sizeof(float));
1919 ac->dsp.vector_fmul_window(out + 448, saved + 448, buf, swindow_prev, 64);
1920 memcpy( out + 576, buf + 64, 448 * sizeof(float));
1925 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1926 memcpy( saved, temp + 64, 64 * sizeof(float));
1927 ac->dsp.vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, swindow, 64);
1928 ac->dsp.vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, swindow, 64);
1929 ac->dsp.vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, swindow, 64);
1930 memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
1931 } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
1932 memcpy( saved, buf + 512, 448 * sizeof(float));
1933 memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
1934 } else { // LONG_STOP or ONLY_LONG
1935 memcpy( saved, buf + 512, 512 * sizeof(float));
1940 * Apply dependent channel coupling (applied before IMDCT).
1942 * @param index index into coupling gain array
1944 static void apply_dependent_coupling(AACContext *ac,
1945 SingleChannelElement *target,
1946 ChannelElement *cce, int index)
1948 IndividualChannelStream *ics = &cce->ch[0].ics;
1949 const uint16_t *offsets = ics->swb_offset;
1950 float *dest = target->coeffs;
1951 const float *src = cce->ch[0].coeffs;
1952 int g, i, group, k, idx = 0;
1953 if (ac->m4ac.object_type == AOT_AAC_LTP) {
1954 av_log(ac->avctx, AV_LOG_ERROR,
1955 "Dependent coupling is not supported together with LTP\n");
1958 for (g = 0; g < ics->num_window_groups; g++) {
1959 for (i = 0; i < ics->max_sfb; i++, idx++) {
1960 if (cce->ch[0].band_type[idx] != ZERO_BT) {
1961 const float gain = cce->coup.gain[index][idx];
1962 for (group = 0; group < ics->group_len[g]; group++) {
1963 for (k = offsets[i]; k < offsets[i + 1]; k++) {
1965 dest[group * 128 + k] += gain * src[group * 128 + k];
1970 dest += ics->group_len[g] * 128;
1971 src += ics->group_len[g] * 128;
1976 * Apply independent channel coupling (applied after IMDCT).
1978 * @param index index into coupling gain array
1980 static void apply_independent_coupling(AACContext *ac,
1981 SingleChannelElement *target,
1982 ChannelElement *cce, int index)
1985 const float gain = cce->coup.gain[index][0];
1986 const float *src = cce->ch[0].ret;
1987 float *dest = target->ret;
1988 const int len = 1024 << (ac->m4ac.sbr == 1);
1990 for (i = 0; i < len; i++)
1991 dest[i] += gain * src[i];
1995 * channel coupling transformation interface
1997 * @param apply_coupling_method pointer to (in)dependent coupling function
1999 static void apply_channel_coupling(AACContext *ac, ChannelElement *cc,
2000 enum RawDataBlockType type, int elem_id,
2001 enum CouplingPoint coupling_point,
2002 void (*apply_coupling_method)(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index))
2006 for (i = 0; i < MAX_ELEM_ID; i++) {
2007 ChannelElement *cce = ac->che[TYPE_CCE][i];
2010 if (cce && cce->coup.coupling_point == coupling_point) {
2011 ChannelCoupling *coup = &cce->coup;
2013 for (c = 0; c <= coup->num_coupled; c++) {
2014 if (coup->type[c] == type && coup->id_select[c] == elem_id) {
2015 if (coup->ch_select[c] != 1) {
2016 apply_coupling_method(ac, &cc->ch[0], cce, index);
2017 if (coup->ch_select[c] != 0)
2020 if (coup->ch_select[c] != 2)
2021 apply_coupling_method(ac, &cc->ch[1], cce, index++);
2023 index += 1 + (coup->ch_select[c] == 3);
2030 * Convert spectral data to float samples, applying all supported tools as appropriate.
2032 static void spectral_to_sample(AACContext *ac)
2035 for (type = 3; type >= 0; type--) {
2036 for (i = 0; i < MAX_ELEM_ID; i++) {
2037 ChannelElement *che = ac->che[type][i];
2039 if (type <= TYPE_CPE)
2040 apply_channel_coupling(ac, che, type, i, BEFORE_TNS, apply_dependent_coupling);
2041 if (ac->m4ac.object_type == AOT_AAC_LTP) {
2042 if (che->ch[0].ics.predictor_present) {
2043 if (che->ch[0].ics.ltp.present)
2044 apply_ltp(ac, &che->ch[0]);
2045 if (che->ch[1].ics.ltp.present && type == TYPE_CPE)
2046 apply_ltp(ac, &che->ch[1]);
2049 if (che->ch[0].tns.present)
2050 apply_tns(che->ch[0].coeffs, &che->ch[0].tns, &che->ch[0].ics, 1);
2051 if (che->ch[1].tns.present)
2052 apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1);
2053 if (type <= TYPE_CPE)
2054 apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, apply_dependent_coupling);
2055 if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT) {
2056 imdct_and_windowing(ac, &che->ch[0]);
2057 if (ac->m4ac.object_type == AOT_AAC_LTP)
2058 update_ltp(ac, &che->ch[0]);
2059 if (type == TYPE_CPE) {
2060 imdct_and_windowing(ac, &che->ch[1]);
2061 if (ac->m4ac.object_type == AOT_AAC_LTP)
2062 update_ltp(ac, &che->ch[1]);
2064 if (ac->m4ac.sbr > 0) {
2065 ff_sbr_apply(ac, &che->sbr, type, che->ch[0].ret, che->ch[1].ret);
2068 if (type <= TYPE_CCE)
2069 apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, apply_independent_coupling);
2075 static int parse_adts_frame_header(AACContext *ac, GetBitContext *gb)
2078 AACADTSHeaderInfo hdr_info;
2080 size = avpriv_aac_parse_header(gb, &hdr_info);
2082 if (hdr_info.chan_config) {
2083 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
2084 memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
2085 ac->m4ac.chan_config = hdr_info.chan_config;
2086 if (set_default_channel_config(ac->avctx, new_che_pos, hdr_info.chan_config))
2088 if (output_configure(ac, ac->che_pos, new_che_pos, hdr_info.chan_config, OC_TRIAL_FRAME))
2090 } else if (ac->output_configured != OC_LOCKED) {
2091 ac->m4ac.chan_config = 0;
2092 ac->output_configured = OC_NONE;
2094 if (ac->output_configured != OC_LOCKED) {
2097 ac->m4ac.sample_rate = hdr_info.sample_rate;
2098 ac->m4ac.sampling_index = hdr_info.sampling_index;
2099 ac->m4ac.object_type = hdr_info.object_type;
2101 if (!ac->avctx->sample_rate)
2102 ac->avctx->sample_rate = hdr_info.sample_rate;
2103 if (hdr_info.num_aac_frames == 1) {
2104 if (!hdr_info.crc_absent)
2107 av_log_missing_feature(ac->avctx, "More than one AAC RDB per ADTS frame is", 0);
2114 static int aac_decode_frame_int(AVCodecContext *avctx, void *data,
2115 int *data_size, GetBitContext *gb)
2117 AACContext *ac = avctx->priv_data;
2118 ChannelElement *che = NULL, *che_prev = NULL;
2119 enum RawDataBlockType elem_type, elem_type_prev = TYPE_END;
2120 int err, elem_id, data_size_tmp;
2121 int samples = 0, multiplier, audio_found = 0;
2123 if (show_bits(gb, 12) == 0xfff) {
2124 if (parse_adts_frame_header(ac, gb) < 0) {
2125 av_log(avctx, AV_LOG_ERROR, "Error decoding AAC frame header.\n");
2128 if (ac->m4ac.sampling_index > 12) {
2129 av_log(ac->avctx, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->m4ac.sampling_index);
2134 ac->tags_mapped = 0;
2136 while ((elem_type = get_bits(gb, 3)) != TYPE_END) {
2137 elem_id = get_bits(gb, 4);
2139 if (elem_type < TYPE_DSE) {
2140 if (!(che=get_che(ac, elem_type, elem_id))) {
2141 av_log(ac->avctx, AV_LOG_ERROR, "channel element %d.%d is not allocated\n",
2142 elem_type, elem_id);
2148 switch (elem_type) {
2151 err = decode_ics(ac, &che->ch[0], gb, 0, 0);
2156 err = decode_cpe(ac, gb, che);
2161 err = decode_cce(ac, gb, che);
2165 err = decode_ics(ac, &che->ch[0], gb, 0, 0);
2170 err = skip_data_stream_element(ac, gb);
2174 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
2175 memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
2176 if ((err = decode_pce(avctx, &ac->m4ac, new_che_pos, gb)))
2178 if (ac->output_configured > OC_TRIAL_PCE)
2179 av_log(avctx, AV_LOG_ERROR,
2180 "Not evaluating a further program_config_element as this construct is dubious at best.\n");
2182 err = output_configure(ac, ac->che_pos, new_che_pos, 0, OC_TRIAL_PCE);
2188 elem_id += get_bits(gb, 8) - 1;
2189 if (get_bits_left(gb) < 8 * elem_id) {
2190 av_log(avctx, AV_LOG_ERROR, overread_err);
2194 elem_id -= decode_extension_payload(ac, gb, elem_id, che_prev, elem_type_prev);
2195 err = 0; /* FIXME */
2199 err = -1; /* should not happen, but keeps compiler happy */
2204 elem_type_prev = elem_type;
2209 if (get_bits_left(gb) < 3) {
2210 av_log(avctx, AV_LOG_ERROR, overread_err);
2215 spectral_to_sample(ac);
2217 multiplier = (ac->m4ac.sbr == 1) ? ac->m4ac.ext_sample_rate > ac->m4ac.sample_rate : 0;
2218 samples <<= multiplier;
2219 if (ac->output_configured < OC_LOCKED) {
2220 avctx->sample_rate = ac->m4ac.sample_rate << multiplier;
2221 avctx->frame_size = samples;
2224 data_size_tmp = samples * avctx->channels *
2225 av_get_bytes_per_sample(avctx->sample_fmt);
2226 if (*data_size < data_size_tmp) {
2227 av_log(avctx, AV_LOG_ERROR,
2228 "Output buffer too small (%d) or trying to output too many samples (%d) for this frame.\n",
2229 *data_size, data_size_tmp);
2232 *data_size = data_size_tmp;
2235 if (avctx->sample_fmt == AV_SAMPLE_FMT_FLT)
2236 ac->fmt_conv.float_interleave(data, (const float **)ac->output_data,
2237 samples, avctx->channels);
2239 ac->fmt_conv.float_to_int16_interleave(data, (const float **)ac->output_data,
2240 samples, avctx->channels);
2243 if (ac->output_configured && audio_found)
2244 ac->output_configured = OC_LOCKED;
2249 static int aac_decode_frame(AVCodecContext *avctx, void *data,
2250 int *data_size, AVPacket *avpkt)
2252 const uint8_t *buf = avpkt->data;
2253 int buf_size = avpkt->size;
2259 init_get_bits(&gb, buf, buf_size * 8);
2261 if ((err = aac_decode_frame_int(avctx, data, data_size, &gb)) < 0)
2264 buf_consumed = (get_bits_count(&gb) + 7) >> 3;
2265 for (buf_offset = buf_consumed; buf_offset < buf_size; buf_offset++)
2266 if (buf[buf_offset])
2269 return buf_size > buf_offset ? buf_consumed : buf_size;
2272 static av_cold int aac_decode_close(AVCodecContext *avctx)
2274 AACContext *ac = avctx->priv_data;
2277 for (i = 0; i < MAX_ELEM_ID; i++) {
2278 for (type = 0; type < 4; type++) {
2279 if (ac->che[type][i])
2280 ff_aac_sbr_ctx_close(&ac->che[type][i]->sbr);
2281 av_freep(&ac->che[type][i]);
2285 ff_mdct_end(&ac->mdct);
2286 ff_mdct_end(&ac->mdct_small);
2287 ff_mdct_end(&ac->mdct_ltp);
2292 #define LOAS_SYNC_WORD 0x2b7 ///< 11 bits LOAS sync word
2294 struct LATMContext {
2295 AACContext aac_ctx; ///< containing AACContext
2296 int initialized; ///< initilized after a valid extradata was seen
2299 int audio_mux_version_A; ///< LATM syntax version
2300 int frame_length_type; ///< 0/1 variable/fixed frame length
2301 int frame_length; ///< frame length for fixed frame length
2304 static inline uint32_t latm_get_value(GetBitContext *b)
2306 int length = get_bits(b, 2);
2308 return get_bits_long(b, (length+1)*8);
2311 static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
2314 AVCodecContext *avctx = latmctx->aac_ctx.avctx;
2315 MPEG4AudioConfig m4ac;
2316 int config_start_bit = get_bits_count(gb);
2317 int bits_consumed, esize;
2319 if (config_start_bit % 8) {
2320 av_log_missing_feature(latmctx->aac_ctx.avctx, "audio specific "
2321 "config not byte aligned.\n", 1);
2322 return AVERROR_INVALIDDATA;
2325 decode_audio_specific_config(NULL, avctx, &m4ac,
2326 gb->buffer + (config_start_bit / 8),
2327 get_bits_left(gb) / 8);
2329 if (bits_consumed < 0)
2330 return AVERROR_INVALIDDATA;
2332 esize = (bits_consumed+7) / 8;
2334 if (avctx->extradata_size <= esize) {
2335 av_free(avctx->extradata);
2336 avctx->extradata = av_malloc(esize + FF_INPUT_BUFFER_PADDING_SIZE);
2337 if (!avctx->extradata)
2338 return AVERROR(ENOMEM);
2341 avctx->extradata_size = esize;
2342 memcpy(avctx->extradata, gb->buffer + (config_start_bit/8), esize);
2343 memset(avctx->extradata+esize, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2345 skip_bits_long(gb, bits_consumed);
2348 return bits_consumed;
2351 static int read_stream_mux_config(struct LATMContext *latmctx,
2354 int ret, audio_mux_version = get_bits(gb, 1);
2356 latmctx->audio_mux_version_A = 0;
2357 if (audio_mux_version)
2358 latmctx->audio_mux_version_A = get_bits(gb, 1);
2360 if (!latmctx->audio_mux_version_A) {
2362 if (audio_mux_version)
2363 latm_get_value(gb); // taraFullness
2365 skip_bits(gb, 1); // allStreamSameTimeFraming
2366 skip_bits(gb, 6); // numSubFrames
2368 if (get_bits(gb, 4)) { // numPrograms
2369 av_log_missing_feature(latmctx->aac_ctx.avctx,
2370 "multiple programs are not supported\n", 1);
2371 return AVERROR_PATCHWELCOME;
2374 // for each program (which there is only on in DVB)
2376 // for each layer (which there is only on in DVB)
2377 if (get_bits(gb, 3)) { // numLayer
2378 av_log_missing_feature(latmctx->aac_ctx.avctx,
2379 "multiple layers are not supported\n", 1);
2380 return AVERROR_PATCHWELCOME;
2383 // for all but first stream: use_same_config = get_bits(gb, 1);
2384 if (!audio_mux_version) {
2385 if ((ret = latm_decode_audio_specific_config(latmctx, gb)) < 0)
2388 int ascLen = latm_get_value(gb);
2389 if ((ret = latm_decode_audio_specific_config(latmctx, gb)) < 0)
2392 skip_bits_long(gb, ascLen);
2395 latmctx->frame_length_type = get_bits(gb, 3);
2396 switch (latmctx->frame_length_type) {
2398 skip_bits(gb, 8); // latmBufferFullness
2401 latmctx->frame_length = get_bits(gb, 9);
2406 skip_bits(gb, 6); // CELP frame length table index
2410 skip_bits(gb, 1); // HVXC frame length table index
2414 if (get_bits(gb, 1)) { // other data
2415 if (audio_mux_version) {
2416 latm_get_value(gb); // other_data_bits
2420 esc = get_bits(gb, 1);
2426 if (get_bits(gb, 1)) // crc present
2427 skip_bits(gb, 8); // config_crc
2433 static int read_payload_length_info(struct LATMContext *ctx, GetBitContext *gb)
2437 if (ctx->frame_length_type == 0) {
2438 int mux_slot_length = 0;
2440 tmp = get_bits(gb, 8);
2441 mux_slot_length += tmp;
2442 } while (tmp == 255);
2443 return mux_slot_length;
2444 } else if (ctx->frame_length_type == 1) {
2445 return ctx->frame_length;
2446 } else if (ctx->frame_length_type == 3 ||
2447 ctx->frame_length_type == 5 ||
2448 ctx->frame_length_type == 7) {
2449 skip_bits(gb, 2); // mux_slot_length_coded
2454 static int read_audio_mux_element(struct LATMContext *latmctx,
2458 uint8_t use_same_mux = get_bits(gb, 1);
2459 if (!use_same_mux) {
2460 if ((err = read_stream_mux_config(latmctx, gb)) < 0)
2462 } else if (!latmctx->aac_ctx.avctx->extradata) {
2463 av_log(latmctx->aac_ctx.avctx, AV_LOG_DEBUG,
2464 "no decoder config found\n");
2465 return AVERROR(EAGAIN);
2467 if (latmctx->audio_mux_version_A == 0) {
2468 int mux_slot_length_bytes = read_payload_length_info(latmctx, gb);
2469 if (mux_slot_length_bytes * 8 > get_bits_left(gb)) {
2470 av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR, "incomplete frame\n");
2471 return AVERROR_INVALIDDATA;
2472 } else if (mux_slot_length_bytes * 8 + 256 < get_bits_left(gb)) {
2473 av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR,
2474 "frame length mismatch %d << %d\n",
2475 mux_slot_length_bytes * 8, get_bits_left(gb));
2476 return AVERROR_INVALIDDATA;
2483 static int latm_decode_frame(AVCodecContext *avctx, void *out, int *out_size,
2486 struct LATMContext *latmctx = avctx->priv_data;
2490 init_get_bits(&gb, avpkt->data, avpkt->size * 8);
2492 // check for LOAS sync word
2493 if (get_bits(&gb, 11) != LOAS_SYNC_WORD)
2494 return AVERROR_INVALIDDATA;
2496 muxlength = get_bits(&gb, 13) + 3;
2497 // not enough data, the parser should have sorted this
2498 if (muxlength > avpkt->size)
2499 return AVERROR_INVALIDDATA;
2501 if ((err = read_audio_mux_element(latmctx, &gb)) < 0)
2504 if (!latmctx->initialized) {
2505 if (!avctx->extradata) {
2509 if ((err = decode_audio_specific_config(
2510 &latmctx->aac_ctx, avctx, &latmctx->aac_ctx.m4ac,
2511 avctx->extradata, avctx->extradata_size)) < 0)
2513 latmctx->initialized = 1;
2517 if (show_bits(&gb, 12) == 0xfff) {
2518 av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR,
2519 "ADTS header detected, probably as result of configuration "
2521 return AVERROR_INVALIDDATA;
2524 if ((err = aac_decode_frame_int(avctx, out, out_size, &gb)) < 0)
2530 av_cold static int latm_decode_init(AVCodecContext *avctx)
2532 struct LATMContext *latmctx = avctx->priv_data;
2533 int ret = aac_decode_init(avctx);
2535 if (avctx->extradata_size > 0)
2536 latmctx->initialized = !ret;
2542 AVCodec ff_aac_decoder = {
2544 .type = AVMEDIA_TYPE_AUDIO,
2546 .priv_data_size = sizeof(AACContext),
2547 .init = aac_decode_init,
2548 .close = aac_decode_close,
2549 .decode = aac_decode_frame,
2550 .long_name = NULL_IF_CONFIG_SMALL("Advanced Audio Coding"),
2551 .sample_fmts = (const enum AVSampleFormat[]) {
2552 AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
2554 .capabilities = CODEC_CAP_CHANNEL_CONF,
2555 .channel_layouts = aac_channel_layout,
2559 Note: This decoder filter is intended to decode LATM streams transferred
2560 in MPEG transport streams which only contain one program.
2561 To do a more complex LATM demuxing a separate LATM demuxer should be used.
2563 AVCodec ff_aac_latm_decoder = {
2565 .type = AVMEDIA_TYPE_AUDIO,
2566 .id = CODEC_ID_AAC_LATM,
2567 .priv_data_size = sizeof(struct LATMContext),
2568 .init = latm_decode_init,
2569 .close = aac_decode_close,
2570 .decode = latm_decode_frame,
2571 .long_name = NULL_IF_CONFIG_SMALL("AAC LATM (Advanced Audio Codec LATM syntax)"),
2572 .sample_fmts = (const enum AVSampleFormat[]) {
2573 AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
2575 .capabilities = CODEC_CAP_CHANNEL_CONF,
2576 .channel_layouts = aac_channel_layout,