Strong filtering function for future RV40 loop filter
[libav.git] / libavcodec / aac.c
CommitLineData
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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 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file aac.c
25 * AAC decoder
26 * @author Oded Shimon ( ods15 ods15 dyndns org )
27 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28 */
29
30/*
31 * supported tools
32 *
33 * Support? Name
34 * N (code in SoC repo) gain control
35 * Y block switching
36 * Y window shapes - standard
37 * N window shapes - Low Delay
38 * Y filterbank - standard
39 * N (code in SoC repo) filterbank - Scalable Sample Rate
40 * Y Temporal Noise Shaping
41 * N (code in SoC repo) Long Term Prediction
42 * Y intensity stereo
43 * Y channel coupling
44 * N frequency domain prediction
45 * Y Perceptual Noise Substitution
46 * Y Mid/Side stereo
47 * N Scalable Inverse AAC Quantization
48 * N Frequency Selective Switch
49 * N upsampling filter
50 * Y quantization & coding - AAC
51 * N quantization & coding - TwinVQ
52 * N quantization & coding - BSAC
53 * N AAC Error Resilience tools
54 * N Error Resilience payload syntax
55 * N Error Protection tool
56 * N CELP
57 * N Silence Compression
58 * N HVXC
59 * N HVXC 4kbits/s VR
60 * N Structured Audio tools
61 * N Structured Audio Sample Bank Format
62 * N MIDI
63 * N Harmonic and Individual Lines plus Noise
64 * N Text-To-Speech Interface
65 * N (in progress) Spectral Band Replication
66 * Y (not in this code) Layer-1
67 * Y (not in this code) Layer-2
68 * Y (not in this code) Layer-3
69 * N SinuSoidal Coding (Transient, Sinusoid, Noise)
70 * N (planned) Parametric Stereo
71 * N Direct Stream Transfer
72 *
73 * Note: - HE AAC v1 comprises LC AAC with Spectral Band Replication.
74 * - HE AAC v2 comprises LC AAC with Spectral Band Replication and
75 Parametric Stereo.
76 */
77
78
79#include "avcodec.h"
80#include "bitstream.h"
81#include "dsputil.h"
1be0fc29 82#include "lpc.h"
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83
84#include "aac.h"
85#include "aactab.h"
cc0591da 86#include "aacdectab.h"
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87#include "mpeg4audio.h"
88
89#include <assert.h>
90#include <errno.h>
91#include <math.h>
92#include <string.h>
93
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94static VLC vlc_scalefactors;
95static VLC vlc_spectral[11];
96
97
9cc04edf 98/**
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99 * Configure output channel order based on the current program configuration element.
100 *
101 * @param che_pos current channel position configuration
102 * @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
103 *
104 * @return Returns error status. 0 - OK, !0 - error
105 */
106static int output_configure(AACContext *ac, enum ChannelPosition che_pos[4][MAX_ELEM_ID],
107 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID]) {
108 AVCodecContext *avctx = ac->avccontext;
109 int i, type, channels = 0;
110
111 if(!memcmp(che_pos, new_che_pos, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0])))
112 return 0; /* no change */
113
114 memcpy(che_pos, new_che_pos, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
115
116 /* Allocate or free elements depending on if they are in the
117 * current program configuration.
118 *
119 * Set up default 1:1 output mapping.
120 *
121 * For a 5.1 stream the output order will be:
f3399088 122 * [ Center ] [ Front Left ] [ Front Right ] [ LFE ] [ Surround Left ] [ Surround Right ]
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123 */
124
125 for(i = 0; i < MAX_ELEM_ID; i++) {
126 for(type = 0; type < 4; type++) {
127 if(che_pos[type][i]) {
128 if(!ac->che[type][i] && !(ac->che[type][i] = av_mallocz(sizeof(ChannelElement))))
129 return AVERROR(ENOMEM);
130 if(type != TYPE_CCE) {
131 ac->output_data[channels++] = ac->che[type][i]->ch[0].ret;
132 if(type == TYPE_CPE) {
133 ac->output_data[channels++] = ac->che[type][i]->ch[1].ret;
134 }
135 }
136 } else
137 av_freep(&ac->che[type][i]);
138 }
139 }
140
141 avctx->channels = channels;
142 return 0;
143}
144
145/**
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146 * Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
147 *
148 * @param cpe_map Stereo (Channel Pair Element) map, NULL if stereo bit is not present.
149 * @param sce_map mono (Single Channel Element) map
150 * @param type speaker type/position for these channels
151 */
152static void decode_channel_map(enum ChannelPosition *cpe_map,
153 enum ChannelPosition *sce_map, enum ChannelPosition type, GetBitContext * gb, int n) {
154 while(n--) {
155 enum ChannelPosition *map = cpe_map && get_bits1(gb) ? cpe_map : sce_map; // stereo or mono map
156 map[get_bits(gb, 4)] = type;
157 }
158}
159
160/**
161 * Decode program configuration element; reference: table 4.2.
162 *
163 * @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
164 *
165 * @return Returns error status. 0 - OK, !0 - error
166 */
167static int decode_pce(AACContext * ac, enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
168 GetBitContext * gb) {
169 int num_front, num_side, num_back, num_lfe, num_assoc_data, num_cc;
170
171 skip_bits(gb, 2); // object_type
172
173 ac->m4ac.sampling_index = get_bits(gb, 4);
174 if(ac->m4ac.sampling_index > 11) {
175 av_log(ac->avccontext, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->m4ac.sampling_index);
176 return -1;
177 }
178 ac->m4ac.sample_rate = ff_mpeg4audio_sample_rates[ac->m4ac.sampling_index];
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179 num_front = get_bits(gb, 4);
180 num_side = get_bits(gb, 4);
181 num_back = get_bits(gb, 4);
182 num_lfe = get_bits(gb, 2);
183 num_assoc_data = get_bits(gb, 3);
184 num_cc = get_bits(gb, 4);
185
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186 if (get_bits1(gb))
187 skip_bits(gb, 4); // mono_mixdown_tag
188 if (get_bits1(gb))
189 skip_bits(gb, 4); // stereo_mixdown_tag
71e9a1b8 190
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191 if (get_bits1(gb))
192 skip_bits(gb, 3); // mixdown_coeff_index and pseudo_surround
71e9a1b8 193
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194 decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_FRONT, gb, num_front);
195 decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_SIDE, gb, num_side );
196 decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_BACK, gb, num_back );
197 decode_channel_map(NULL, new_che_pos[TYPE_LFE], AAC_CHANNEL_LFE, gb, num_lfe );
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198
199 skip_bits_long(gb, 4 * num_assoc_data);
200
cc0591da 201 decode_channel_map(new_che_pos[TYPE_CCE], new_che_pos[TYPE_CCE], AAC_CHANNEL_CC, gb, num_cc );
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202
203 align_get_bits(gb);
204
205 /* comment field, first byte is length */
206 skip_bits_long(gb, 8 * get_bits(gb, 8));
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207 return 0;
208}
71e9a1b8 209
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210/**
211 * Set up channel positions based on a default channel configuration
212 * as specified in table 1.17.
213 *
214 * @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
215 *
216 * @return Returns error status. 0 - OK, !0 - error
217 */
218static int set_default_channel_config(AACContext *ac, enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
219 int channel_config)
220{
221 if(channel_config < 1 || channel_config > 7) {
222 av_log(ac->avccontext, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
223 channel_config);
224 return -1;
225 }
226
227 /* default channel configurations:
228 *
229 * 1ch : front center (mono)
230 * 2ch : L + R (stereo)
231 * 3ch : front center + L + R
232 * 4ch : front center + L + R + back center
233 * 5ch : front center + L + R + back stereo
234 * 6ch : front center + L + R + back stereo + LFE
235 * 7ch : front center + L + R + outer front left + outer front right + back stereo + LFE
236 */
237
238 if(channel_config != 2)
239 new_che_pos[TYPE_SCE][0] = AAC_CHANNEL_FRONT; // front center (or mono)
240 if(channel_config > 1)
241 new_che_pos[TYPE_CPE][0] = AAC_CHANNEL_FRONT; // L + R (or stereo)
242 if(channel_config == 4)
243 new_che_pos[TYPE_SCE][1] = AAC_CHANNEL_BACK; // back center
244 if(channel_config > 4)
245 new_che_pos[TYPE_CPE][(channel_config == 7) + 1]
246 = AAC_CHANNEL_BACK; // back stereo
247 if(channel_config > 5)
248 new_che_pos[TYPE_LFE][0] = AAC_CHANNEL_LFE; // LFE
249 if(channel_config == 7)
250 new_che_pos[TYPE_CPE][1] = AAC_CHANNEL_FRONT; // outer front left + outer front right
251
252 return 0;
253}
254
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255/**
256 * Decode GA "General Audio" specific configuration; reference: table 4.1.
257 *
258 * @return Returns error status. 0 - OK, !0 - error
259 */
260static int decode_ga_specific_config(AACContext * ac, GetBitContext * gb, int channel_config) {
261 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
262 int extension_flag, ret;
263
264 if(get_bits1(gb)) { // frameLengthFlag
265 av_log_missing_feature(ac->avccontext, "960/120 MDCT window is", 1);
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266 return -1;
267 }
268
269 if (get_bits1(gb)) // dependsOnCoreCoder
270 skip_bits(gb, 14); // coreCoderDelay
271 extension_flag = get_bits1(gb);
272
273 if(ac->m4ac.object_type == AOT_AAC_SCALABLE ||
274 ac->m4ac.object_type == AOT_ER_AAC_SCALABLE)
275 skip_bits(gb, 3); // layerNr
276
277 memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
278 if (channel_config == 0) {
279 skip_bits(gb, 4); // element_instance_tag
280 if((ret = decode_pce(ac, new_che_pos, gb)))
281 return ret;
282 } else {
283 if((ret = set_default_channel_config(ac, new_che_pos, channel_config)))
284 return ret;
285 }
286 if((ret = output_configure(ac, ac->che_pos, new_che_pos)))
287 return ret;
288
289 if (extension_flag) {
290 switch (ac->m4ac.object_type) {
291 case AOT_ER_BSAC:
292 skip_bits(gb, 5); // numOfSubFrame
293 skip_bits(gb, 11); // layer_length
294 break;
295 case AOT_ER_AAC_LC:
296 case AOT_ER_AAC_LTP:
297 case AOT_ER_AAC_SCALABLE:
298 case AOT_ER_AAC_LD:
299 skip_bits(gb, 3); /* aacSectionDataResilienceFlag
300 * aacScalefactorDataResilienceFlag
301 * aacSpectralDataResilienceFlag
302 */
303 break;
304 }
305 skip_bits1(gb); // extensionFlag3 (TBD in version 3)
306 }
307 return 0;
308}
309
310/**
311 * Decode audio specific configuration; reference: table 1.13.
312 *
313 * @param data pointer to AVCodecContext extradata
314 * @param data_size size of AVCCodecContext extradata
315 *
316 * @return Returns error status. 0 - OK, !0 - error
317 */
318static int decode_audio_specific_config(AACContext * ac, void *data, int data_size) {
319 GetBitContext gb;
320 int i;
321
322 init_get_bits(&gb, data, data_size * 8);
323
324 if((i = ff_mpeg4audio_get_config(&ac->m4ac, data, data_size)) < 0)
325 return -1;
326 if(ac->m4ac.sampling_index > 11) {
327 av_log(ac->avccontext, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->m4ac.sampling_index);
328 return -1;
329 }
330
331 skip_bits_long(&gb, i);
332
333 switch (ac->m4ac.object_type) {
334 case AOT_AAC_LC:
335 if (decode_ga_specific_config(ac, &gb, ac->m4ac.chan_config))
336 return -1;
337 break;
338 default:
339 av_log(ac->avccontext, AV_LOG_ERROR, "Audio object type %s%d is not supported.\n",
340 ac->m4ac.sbr == 1? "SBR+" : "", ac->m4ac.object_type);
341 return -1;
342 }
343 return 0;
344}
345
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346/**
347 * linear congruential pseudorandom number generator
348 *
349 * @param previous_val pointer to the current state of the generator
350 *
351 * @return Returns a 32-bit pseudorandom integer
352 */
353static av_always_inline int lcg_random(int previous_val) {
354 return previous_val * 1664525 + 1013904223;
355}
356
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357static av_cold int aac_decode_init(AVCodecContext * avccontext) {
358 AACContext * ac = avccontext->priv_data;
359 int i;
360
361 ac->avccontext = avccontext;
362
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363 if (avccontext->extradata_size <= 0 ||
364 decode_audio_specific_config(ac, avccontext->extradata, avccontext->extradata_size))
365 return -1;
366
9cc04edf 367 avccontext->sample_fmt = SAMPLE_FMT_S16;
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368 avccontext->sample_rate = ac->m4ac.sample_rate;
369 avccontext->frame_size = 1024;
370
371 AAC_INIT_VLC_STATIC( 0, 144);
372 AAC_INIT_VLC_STATIC( 1, 114);
373 AAC_INIT_VLC_STATIC( 2, 188);
374 AAC_INIT_VLC_STATIC( 3, 180);
375 AAC_INIT_VLC_STATIC( 4, 172);
376 AAC_INIT_VLC_STATIC( 5, 140);
377 AAC_INIT_VLC_STATIC( 6, 168);
378 AAC_INIT_VLC_STATIC( 7, 114);
379 AAC_INIT_VLC_STATIC( 8, 262);
380 AAC_INIT_VLC_STATIC( 9, 248);
381 AAC_INIT_VLC_STATIC(10, 384);
382
383 dsputil_init(&ac->dsp, avccontext);
384
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385 ac->random_state = 0x1f2e3d4c;
386
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387 // -1024 - Compensate wrong IMDCT method.
388 // 32768 - Required to scale values to the correct range for the bias method
389 // for float to int16 conversion.
390
391 if(ac->dsp.float_to_int16 == ff_float_to_int16_c) {
392 ac->add_bias = 385.0f;
393 ac->sf_scale = 1. / (-1024. * 32768.);
394 ac->sf_offset = 0;
395 } else {
396 ac->add_bias = 0.0f;
397 ac->sf_scale = 1. / -1024.;
398 ac->sf_offset = 60;
399 }
400
401#ifndef CONFIG_HARDCODED_TABLES
d0ee5021 402 for (i = 0; i < 428; i++)
cc0591da 403 ff_aac_pow2sf_tab[i] = pow(2, (i - 200)/4.);
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404#endif /* CONFIG_HARDCODED_TABLES */
405
37d3e066 406 INIT_VLC_STATIC(&vlc_scalefactors,7,FF_ARRAY_ELEMS(ff_aac_scalefactor_code),
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407 ff_aac_scalefactor_bits, sizeof(ff_aac_scalefactor_bits[0]), sizeof(ff_aac_scalefactor_bits[0]),
408 ff_aac_scalefactor_code, sizeof(ff_aac_scalefactor_code[0]), sizeof(ff_aac_scalefactor_code[0]),
409 352);
410
411 ff_mdct_init(&ac->mdct, 11, 1);
412 ff_mdct_init(&ac->mdct_small, 8, 1);
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413 // window initialization
414 ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
415 ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
416 ff_sine_window_init(ff_sine_1024, 1024);
417 ff_sine_window_init(ff_sine_128, 128);
418
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419 return 0;
420}
421
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422/**
423 * Skip data_stream_element; reference: table 4.10.
424 */
425static void skip_data_stream_element(GetBitContext * gb) {
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426 int byte_align = get_bits1(gb);
427 int count = get_bits(gb, 8);
428 if (count == 255)
429 count += get_bits(gb, 8);
430 if (byte_align)
431 align_get_bits(gb);
432 skip_bits_long(gb, 8 * count);
433}
434
435/**
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436 * Decode Individual Channel Stream info; reference: table 4.6.
437 *
438 * @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
439 */
440static int decode_ics_info(AACContext * ac, IndividualChannelStream * ics, GetBitContext * gb, int common_window) {
441 if (get_bits1(gb)) {
442 av_log(ac->avccontext, AV_LOG_ERROR, "Reserved bit set.\n");
443 memset(ics, 0, sizeof(IndividualChannelStream));
444 return -1;
445 }
446 ics->window_sequence[1] = ics->window_sequence[0];
447 ics->window_sequence[0] = get_bits(gb, 2);
448 ics->use_kb_window[1] = ics->use_kb_window[0];
449 ics->use_kb_window[0] = get_bits1(gb);
450 ics->num_window_groups = 1;
451 ics->group_len[0] = 1;
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452 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
453 int i;
454 ics->max_sfb = get_bits(gb, 4);
455 for (i = 0; i < 7; i++) {
456 if (get_bits1(gb)) {
457 ics->group_len[ics->num_window_groups-1]++;
458 } else {
459 ics->num_window_groups++;
460 ics->group_len[ics->num_window_groups-1] = 1;
461 }
462 }
463 ics->num_windows = 8;
464 ics->swb_offset = swb_offset_128[ac->m4ac.sampling_index];
465 ics->num_swb = ff_aac_num_swb_128[ac->m4ac.sampling_index];
466 ics->tns_max_bands = tns_max_bands_128[ac->m4ac.sampling_index];
467 } else {
468 ics->max_sfb = get_bits(gb, 6);
469 ics->num_windows = 1;
470 ics->swb_offset = swb_offset_1024[ac->m4ac.sampling_index];
471 ics->num_swb = ff_aac_num_swb_1024[ac->m4ac.sampling_index];
472 ics->tns_max_bands = tns_max_bands_1024[ac->m4ac.sampling_index];
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473 if (get_bits1(gb)) {
474 av_log_missing_feature(ac->avccontext, "Predictor bit set but LTP is", 1);
475 memset(ics, 0, sizeof(IndividualChannelStream));
476 return -1;
477 }
478 }
479
480 if(ics->max_sfb > ics->num_swb) {
481 av_log(ac->avccontext, AV_LOG_ERROR,
482 "Number of scalefactor bands in group (%d) exceeds limit (%d).\n",
483 ics->max_sfb, ics->num_swb);
484 memset(ics, 0, sizeof(IndividualChannelStream));
485 return -1;
486 }
487
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488 return 0;
489}
490
491/**
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492 * Decode band types (section_data payload); reference: table 4.46.
493 *
494 * @param band_type array of the used band type
495 * @param band_type_run_end array of the last scalefactor band of a band type run
496 *
497 * @return Returns error status. 0 - OK, !0 - error
498 */
499static int decode_band_types(AACContext * ac, enum BandType band_type[120],
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500 int band_type_run_end[120], GetBitContext * gb, IndividualChannelStream * ics) {
501 int g, idx = 0;
502 const int bits = (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) ? 3 : 5;
503 for (g = 0; g < ics->num_window_groups; g++) {
504 int k = 0;
505 while (k < ics->max_sfb) {
506 uint8_t sect_len = k;
507 int sect_len_incr;
508 int sect_band_type = get_bits(gb, 4);
509 if (sect_band_type == 12) {
510 av_log(ac->avccontext, AV_LOG_ERROR, "invalid band type\n");
511 return -1;
512 }
513 while ((sect_len_incr = get_bits(gb, bits)) == (1 << bits)-1)
514 sect_len += sect_len_incr;
515 sect_len += sect_len_incr;
516 if (sect_len > ics->max_sfb) {
517 av_log(ac->avccontext, AV_LOG_ERROR,
518 "Number of bands (%d) exceeds limit (%d).\n",
519 sect_len, ics->max_sfb);
520 return -1;
521 }
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522 for (; k < sect_len; k++) {
523 band_type [idx] = sect_band_type;
524 band_type_run_end[idx++] = sect_len;
525 }
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526 }
527 }
528 return 0;
529}
cc0591da 530
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531/**
532 * Decode scalefactors; reference: table 4.47.
cc0591da 533 *
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534 * @param global_gain first scalefactor value as scalefactors are differentially coded
535 * @param band_type array of the used band type
536 * @param band_type_run_end array of the last scalefactor band of a band type run
537 * @param sf array of scalefactors or intensity stereo positions
538 *
539 * @return Returns error status. 0 - OK, !0 - error
540 */
541static int decode_scalefactors(AACContext * ac, float sf[120], GetBitContext * gb,
9edae4ad 542 unsigned int global_gain, IndividualChannelStream * ics,
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543 enum BandType band_type[120], int band_type_run_end[120]) {
544 const int sf_offset = ac->sf_offset + (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE ? 12 : 0);
545 int g, i, idx = 0;
546 int offset[3] = { global_gain, global_gain - 90, 100 };
547 int noise_flag = 1;
548 static const char *sf_str[3] = { "Global gain", "Noise gain", "Intensity stereo position" };
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549 for (g = 0; g < ics->num_window_groups; g++) {
550 for (i = 0; i < ics->max_sfb;) {
551 int run_end = band_type_run_end[idx];
552 if (band_type[idx] == ZERO_BT) {
553 for(; i < run_end; i++, idx++)
554 sf[idx] = 0.;
555 }else if((band_type[idx] == INTENSITY_BT) || (band_type[idx] == INTENSITY_BT2)) {
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556 for(; i < run_end; i++, idx++) {
557 offset[2] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
558 if(offset[2] > 255U) {
559 av_log(ac->avccontext, AV_LOG_ERROR,
560 "%s (%d) out of range.\n", sf_str[2], offset[2]);
561 return -1;
562 }
563 sf[idx] = ff_aac_pow2sf_tab[-offset[2] + 300];
cc0591da
RS
564 }
565 }else if(band_type[idx] == NOISE_BT) {
566 for(; i < run_end; i++, idx++) {
567 if(noise_flag-- > 0)
568 offset[1] += get_bits(gb, 9) - 256;
569 else
570 offset[1] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
571 if(offset[1] > 255U) {
572 av_log(ac->avccontext, AV_LOG_ERROR,
573 "%s (%d) out of range.\n", sf_str[1], offset[1]);
574 return -1;
575 }
d0ee5021 576 sf[idx] = -ff_aac_pow2sf_tab[ offset[1] + sf_offset + 100];
cc0591da
RS
577 }
578 }else {
579 for(; i < run_end; i++, idx++) {
580 offset[0] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
581 if(offset[0] > 255U) {
582 av_log(ac->avccontext, AV_LOG_ERROR,
583 "%s (%d) out of range.\n", sf_str[0], offset[0]);
584 return -1;
585 }
586 sf[idx] = -ff_aac_pow2sf_tab[ offset[0] + sf_offset];
cc0591da
RS
587 }
588 }
589 }
590 }
591 return 0;
592}
593
594/**
595 * Decode pulse data; reference: table 4.7.
596 */
aac0eda4
AC
597static int decode_pulses(Pulse * pulse, GetBitContext * gb, const uint16_t * swb_offset, int num_swb) {
598 int i, pulse_swb;
cc0591da 599 pulse->num_pulse = get_bits(gb, 2) + 1;
aac0eda4
AC
600 pulse_swb = get_bits(gb, 6);
601 if (pulse_swb >= num_swb)
602 return -1;
603 pulse->pos[0] = swb_offset[pulse_swb];
408992ba 604 pulse->pos[0] += get_bits(gb, 5);
aac0eda4
AC
605 if (pulse->pos[0] > 1023)
606 return -1;
848a5815
RS
607 pulse->amp[0] = get_bits(gb, 4);
608 for (i = 1; i < pulse->num_pulse; i++) {
609 pulse->pos[i] = get_bits(gb, 5) + pulse->pos[i-1];
aac0eda4
AC
610 if (pulse->pos[i] > 1023)
611 return -1;
848a5815 612 pulse->amp[i] = get_bits(gb, 4);
cc0591da 613 }
aac0eda4 614 return 0;
cc0591da
RS
615}
616
617/**
1dece0d2
RS
618 * Decode Temporal Noise Shaping data; reference: table 4.48.
619 *
620 * @return Returns error status. 0 - OK, !0 - error
621 */
622static int decode_tns(AACContext * ac, TemporalNoiseShaping * tns,
623 GetBitContext * gb, const IndividualChannelStream * ics) {
624 int w, filt, i, coef_len, coef_res, coef_compress;
625 const int is8 = ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE;
626 const int tns_max_order = is8 ? 7 : ac->m4ac.object_type == AOT_AAC_MAIN ? 20 : 12;
627 for (w = 0; w < ics->num_windows; w++) {
fbd91d7c 628 if ((tns->n_filt[w] = get_bits(gb, 2 - is8))) {
1dece0d2
RS
629 coef_res = get_bits1(gb);
630
65b20b24
RS
631 for (filt = 0; filt < tns->n_filt[w]; filt++) {
632 int tmp2_idx;
633 tns->length[w][filt] = get_bits(gb, 6 - 2*is8);
634
635 if ((tns->order[w][filt] = get_bits(gb, 5 - 2*is8)) > tns_max_order) {
636 av_log(ac->avccontext, AV_LOG_ERROR, "TNS filter order %d is greater than maximum %d.",
637 tns->order[w][filt], tns_max_order);
638 tns->order[w][filt] = 0;
639 return -1;
640 }
51673647 641 if (tns->order[w][filt]) {
35445d29
RS
642 tns->direction[w][filt] = get_bits1(gb);
643 coef_compress = get_bits1(gb);
644 coef_len = coef_res + 3 - coef_compress;
645 tmp2_idx = 2*coef_compress + coef_res;
1dece0d2 646
35445d29
RS
647 for (i = 0; i < tns->order[w][filt]; i++)
648 tns->coef[w][filt][i] = tns_tmp2_map[tmp2_idx][get_bits(gb, coef_len)];
51673647 649 }
65b20b24 650 }
fbd91d7c 651 }
1dece0d2
RS
652 }
653 return 0;
654}
655
656/**
9cc04edf
RS
657 * Decode Mid/Side data; reference: table 4.54.
658 *
659 * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
660 * [1] mask is decoded from bitstream; [2] mask is all 1s;
661 * [3] reserved for scalable AAC
662 */
663static void decode_mid_side_stereo(ChannelElement * cpe, GetBitContext * gb,
664 int ms_present) {
62a57fae
RS
665 int idx;
666 if (ms_present == 1) {
667 for (idx = 0; idx < cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb; idx++)
668 cpe->ms_mask[idx] = get_bits1(gb);
669 } else if (ms_present == 2) {
670 memset(cpe->ms_mask, 1, cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb * sizeof(cpe->ms_mask[0]));
671 }
672}
9cc04edf
RS
673
674/**
9ffd5c1c
RS
675 * Decode spectral data; reference: table 4.50.
676 * Dequantize and scale spectral data; reference: 4.6.3.3.
677 *
678 * @param coef array of dequantized, scaled spectral data
679 * @param sf array of scalefactors or intensity stereo positions
680 * @param pulse_present set if pulses are present
681 * @param pulse pointer to pulse data struct
682 * @param band_type array of the used band type
683 *
684 * @return Returns error status. 0 - OK, !0 - error
685 */
686static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBitContext * gb, float sf[120],
687 int pulse_present, const Pulse * pulse, const IndividualChannelStream * ics, enum BandType band_type[120]) {
688 int i, k, g, idx = 0;
689 const int c = 1024/ics->num_windows;
690 const uint16_t * offsets = ics->swb_offset;
691 float *coef_base = coef;
692
693 for (g = 0; g < ics->num_windows; g++)
694 memset(coef + g * 128 + offsets[ics->max_sfb], 0, sizeof(float)*(c - offsets[ics->max_sfb]));
695
696 for (g = 0; g < ics->num_window_groups; g++) {
697 for (i = 0; i < ics->max_sfb; i++, idx++) {
698 const int cur_band_type = band_type[idx];
699 const int dim = cur_band_type >= FIRST_PAIR_BT ? 2 : 4;
700 const int is_cb_unsigned = IS_CODEBOOK_UNSIGNED(cur_band_type);
701 int group;
702 if (cur_band_type == ZERO_BT) {
703 for (group = 0; group < ics->group_len[g]; group++) {
704 memset(coef + group * 128 + offsets[i], 0, (offsets[i+1] - offsets[i])*sizeof(float));
705 }
706 }else if (cur_band_type == NOISE_BT) {
9ffd5c1c 707 for (group = 0; group < ics->group_len[g]; group++) {
d0ee5021
AC
708 float scale;
709 float band_energy = 0;
9ffd5c1c
RS
710 for (k = offsets[i]; k < offsets[i+1]; k++) {
711 ac->random_state = lcg_random(ac->random_state);
d0ee5021
AC
712 coef[group*128+k] = ac->random_state;
713 band_energy += coef[group*128+k]*coef[group*128+k];
714 }
715 scale = sf[idx] / sqrtf(band_energy);
716 for (k = offsets[i]; k < offsets[i+1]; k++) {
717 coef[group*128+k] *= scale;
9ffd5c1c
RS
718 }
719 }
720 }else if (cur_band_type != INTENSITY_BT2 && cur_band_type != INTENSITY_BT) {
721 for (group = 0; group < ics->group_len[g]; group++) {
722 for (k = offsets[i]; k < offsets[i+1]; k += dim) {
723 const int index = get_vlc2(gb, vlc_spectral[cur_band_type - 1].table, 6, 3);
724 const int coef_tmp_idx = (group << 7) + k;
725 const float *vq_ptr;
726 int j;
727 if(index >= ff_aac_spectral_sizes[cur_band_type - 1]) {
728 av_log(ac->avccontext, AV_LOG_ERROR,
729 "Read beyond end of ff_aac_codebook_vectors[%d][]. index %d >= %d\n",
730 cur_band_type - 1, index, ff_aac_spectral_sizes[cur_band_type - 1]);
731 return -1;
732 }
733 vq_ptr = &ff_aac_codebook_vectors[cur_band_type - 1][index * dim];
734 if (is_cb_unsigned) {
735 for (j = 0; j < dim; j++)
736 if (vq_ptr[j])
737 coef[coef_tmp_idx + j] = 1 - 2*(int)get_bits1(gb);
738 }else {
739 for (j = 0; j < dim; j++)
740 coef[coef_tmp_idx + j] = 1.0f;
741 }
742 if (cur_band_type == ESC_BT) {
743 for (j = 0; j < 2; j++) {
744 if (vq_ptr[j] == 64.0f) {
745 int n = 4;
746 /* The total length of escape_sequence must be < 22 bits according
747 to the specification (i.e. max is 11111111110xxxxxxxxxx). */
748 while (get_bits1(gb) && n < 15) n++;
749 if(n == 15) {
750 av_log(ac->avccontext, AV_LOG_ERROR, "error in spectral data, ESC overflow\n");
751 return -1;
752 }
753 n = (1<<n) + get_bits(gb, n);
754 coef[coef_tmp_idx + j] *= cbrtf(fabsf(n)) * n;
755 }else
756 coef[coef_tmp_idx + j] *= vq_ptr[j];
757 }
758 }else
759 for (j = 0; j < dim; j++)
760 coef[coef_tmp_idx + j] *= vq_ptr[j];
761 for (j = 0; j < dim; j++)
762 coef[coef_tmp_idx + j] *= sf[idx];
763 }
764 }
765 }
766 }
767 coef += ics->group_len[g]<<7;
768 }
769
770 if (pulse_present) {
51436848 771 idx = 0;
9ffd5c1c
RS
772 for(i = 0; i < pulse->num_pulse; i++){
773 float co = coef_base[ pulse->pos[i] ];
51436848
AC
774 while(offsets[idx + 1] <= pulse->pos[i])
775 idx++;
776 if (band_type[idx] != NOISE_BT && sf[idx]) {
70735a3f
RS
777 float ico = -pulse->amp[i];
778 if (co) {
779 co /= sf[idx];
780 ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico);
781 }
782 coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx];
51436848 783 }
9ffd5c1c
RS
784 }
785 }
786 return 0;
787}
788
789/**
9cc04edf
RS
790 * Decode an individual_channel_stream payload; reference: table 4.44.
791 *
792 * @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
793 * @param scale_flag scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.)
794 *
795 * @return Returns error status. 0 - OK, !0 - error
796 */
797static int decode_ics(AACContext * ac, SingleChannelElement * sce, GetBitContext * gb, int common_window, int scale_flag) {
9cc04edf
RS
798 Pulse pulse;
799 TemporalNoiseShaping * tns = &sce->tns;
800 IndividualChannelStream * ics = &sce->ics;
801 float * out = sce->coeffs;
802 int global_gain, pulse_present = 0;
803
848a5815
RS
804 /* This assignment is to silence a GCC warning about the variable being used
805 * uninitialized when in fact it always is.
9cc04edf
RS
806 */
807 pulse.num_pulse = 0;
9cc04edf
RS
808
809 global_gain = get_bits(gb, 8);
810
811 if (!common_window && !scale_flag) {
812 if (decode_ics_info(ac, ics, gb, 0) < 0)
813 return -1;
814 }
815
816 if (decode_band_types(ac, sce->band_type, sce->band_type_run_end, gb, ics) < 0)
817 return -1;
818 if (decode_scalefactors(ac, sce->sf, gb, global_gain, ics, sce->band_type, sce->band_type_run_end) < 0)
819 return -1;
820
821 pulse_present = 0;
822 if (!scale_flag) {
823 if ((pulse_present = get_bits1(gb))) {
824 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
825 av_log(ac->avccontext, AV_LOG_ERROR, "Pulse tool not allowed in eight short sequence.\n");
826 return -1;
827 }
aac0eda4
AC
828 if (decode_pulses(&pulse, gb, ics->swb_offset, ics->num_swb)) {
829 av_log(ac->avccontext, AV_LOG_ERROR, "Pulse data corrupt or invalid.\n");
830 return -1;
831 }
9cc04edf
RS
832 }
833 if ((tns->present = get_bits1(gb)) && decode_tns(ac, tns, gb, ics))
834 return -1;
835 if (get_bits1(gb)) {
836 av_log_missing_feature(ac->avccontext, "SSR", 1);
837 return -1;
838 }
839 }
840
848a5815 841 if (decode_spectrum_and_dequant(ac, out, gb, sce->sf, pulse_present, &pulse, ics, sce->band_type) < 0)
9cc04edf 842 return -1;
9cc04edf
RS
843 return 0;
844}
845
846/**
9ffd5c1c
RS
847 * Mid/Side stereo decoding; reference: 4.6.8.1.3.
848 */
849static void apply_mid_side_stereo(ChannelElement * cpe) {
850 const IndividualChannelStream * ics = &cpe->ch[0].ics;
851 float *ch0 = cpe->ch[0].coeffs;
852 float *ch1 = cpe->ch[1].coeffs;
853 int g, i, k, group, idx = 0;
854 const uint16_t * offsets = ics->swb_offset;
855 for (g = 0; g < ics->num_window_groups; g++) {
856 for (i = 0; i < ics->max_sfb; i++, idx++) {
857 if (cpe->ms_mask[idx] &&
858 cpe->ch[0].band_type[idx] < NOISE_BT && cpe->ch[1].band_type[idx] < NOISE_BT) {
859 for (group = 0; group < ics->group_len[g]; group++) {
860 for (k = offsets[i]; k < offsets[i+1]; k++) {
861 float tmp = ch0[group*128 + k] - ch1[group*128 + k];
862 ch0[group*128 + k] += ch1[group*128 + k];
863 ch1[group*128 + k] = tmp;
864 }
865 }
866 }
867 }
868 ch0 += ics->group_len[g]*128;
869 ch1 += ics->group_len[g]*128;
870 }
871}
872
873/**
874 * intensity stereo decoding; reference: 4.6.8.2.3
875 *
876 * @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
877 * [1] mask is decoded from bitstream; [2] mask is all 1s;
878 * [3] reserved for scalable AAC
879 */
880static void apply_intensity_stereo(ChannelElement * cpe, int ms_present) {
881 const IndividualChannelStream * ics = &cpe->ch[1].ics;
882 SingleChannelElement * sce1 = &cpe->ch[1];
883 float *coef0 = cpe->ch[0].coeffs, *coef1 = cpe->ch[1].coeffs;
884 const uint16_t * offsets = ics->swb_offset;
885 int g, group, i, k, idx = 0;
886 int c;
887 float scale;
888 for (g = 0; g < ics->num_window_groups; g++) {
889 for (i = 0; i < ics->max_sfb;) {
890 if (sce1->band_type[idx] == INTENSITY_BT || sce1->band_type[idx] == INTENSITY_BT2) {
891 const int bt_run_end = sce1->band_type_run_end[idx];
892 for (; i < bt_run_end; i++, idx++) {
893 c = -1 + 2 * (sce1->band_type[idx] - 14);
894 if (ms_present)
895 c *= 1 - 2 * cpe->ms_mask[idx];
896 scale = c * sce1->sf[idx];
897 for (group = 0; group < ics->group_len[g]; group++)
898 for (k = offsets[i]; k < offsets[i+1]; k++)
899 coef1[group*128 + k] = scale * coef0[group*128 + k];
900 }
901 } else {
902 int bt_run_end = sce1->band_type_run_end[idx];
903 idx += bt_run_end - i;
904 i = bt_run_end;
905 }
906 }
907 coef0 += ics->group_len[g]*128;
908 coef1 += ics->group_len[g]*128;
909 }
910}
911
912/**
9cc04edf
RS
913 * Decode a channel_pair_element; reference: table 4.4.
914 *
915 * @param elem_id Identifies the instance of a syntax element.
916 *
917 * @return Returns error status. 0 - OK, !0 - error
918 */
919static int decode_cpe(AACContext * ac, GetBitContext * gb, int elem_id) {
920 int i, ret, common_window, ms_present = 0;
921 ChannelElement * cpe;
922
923 cpe = ac->che[TYPE_CPE][elem_id];
924 common_window = get_bits1(gb);
925 if (common_window) {
926 if (decode_ics_info(ac, &cpe->ch[0].ics, gb, 1))
927 return -1;
928 i = cpe->ch[1].ics.use_kb_window[0];
929 cpe->ch[1].ics = cpe->ch[0].ics;
930 cpe->ch[1].ics.use_kb_window[1] = i;
931 ms_present = get_bits(gb, 2);
932 if(ms_present == 3) {
933 av_log(ac->avccontext, AV_LOG_ERROR, "ms_present = 3 is reserved.\n");
934 return -1;
935 } else if(ms_present)
936 decode_mid_side_stereo(cpe, gb, ms_present);
937 }
938 if ((ret = decode_ics(ac, &cpe->ch[0], gb, common_window, 0)))
939 return ret;
940 if ((ret = decode_ics(ac, &cpe->ch[1], gb, common_window, 0)))
941 return ret;
942
943 if (common_window && ms_present)
944 apply_mid_side_stereo(cpe);
945
848a5815 946 apply_intensity_stereo(cpe, ms_present);
9cc04edf
RS
947 return 0;
948}
949
9ffd5c1c
RS
950/**
951 * Decode coupling_channel_element; reference: table 4.8.
952 *
953 * @param elem_id Identifies the instance of a syntax element.
954 *
955 * @return Returns error status. 0 - OK, !0 - error
956 */
957static int decode_cce(AACContext * ac, GetBitContext * gb, ChannelElement * che) {
958 int num_gain = 0;
341b28c0 959 int c, g, sfb, ret;
9ffd5c1c
RS
960 int sign;
961 float scale;
962 SingleChannelElement * sce = &che->ch[0];
963 ChannelCoupling * coup = &che->coup;
964
62a57fae
RS
965 coup->coupling_point = 2*get_bits1(gb);
966 coup->num_coupled = get_bits(gb, 3);
967 for (c = 0; c <= coup->num_coupled; c++) {
968 num_gain++;
969 coup->type[c] = get_bits1(gb) ? TYPE_CPE : TYPE_SCE;
970 coup->id_select[c] = get_bits(gb, 4);
971 if (coup->type[c] == TYPE_CPE) {
972 coup->ch_select[c] = get_bits(gb, 2);
973 if (coup->ch_select[c] == 3)
974 num_gain++;
975 } else
88de95c2 976 coup->ch_select[c] = 2;
62a57fae
RS
977 }
978 coup->coupling_point += get_bits1(gb);
979
980 if (coup->coupling_point == 2) {
981 av_log(ac->avccontext, AV_LOG_ERROR,
982 "Independently switched CCE with 'invalid' domain signalled.\n");
983 memset(coup, 0, sizeof(ChannelCoupling));
984 return -1;
985 }
986
987 sign = get_bits(gb, 1);
c8947a56 988 scale = pow(2., pow(2., (int)get_bits(gb, 2) - 3));
62a57fae
RS
989
990 if ((ret = decode_ics(ac, sce, gb, 0, 0)))
991 return ret;
992
993 for (c = 0; c < num_gain; c++) {
341b28c0 994 int idx = 0;
62a57fae
RS
995 int cge = 1;
996 int gain = 0;
997 float gain_cache = 1.;
998 if (c) {
999 cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb);
1000 gain = cge ? get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60: 0;
88de95c2 1001 gain_cache = pow(scale, -gain);
62a57fae 1002 }
f80a8ca5
RS
1003 for (g = 0; g < sce->ics.num_window_groups; g++) {
1004 for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) {
62a57fae
RS
1005 if (sce->band_type[idx] != ZERO_BT) {
1006 if (!cge) {
1007 int t = get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
1008 if (t) {
1009 int s = 1;
88de95c2 1010 t = gain += t;
62a57fae
RS
1011 if (sign) {
1012 s -= 2 * (t & 0x1);
1013 t >>= 1;
1014 }
88de95c2 1015 gain_cache = pow(scale, -t) * s;
62a57fae
RS
1016 }
1017 }
1018 coup->gain[c][idx] = gain_cache;
1019 }
f80a8ca5
RS
1020 }
1021 }
62a57fae
RS
1022 }
1023 return 0;
1024}
1025
9cc04edf
RS
1026/**
1027 * Decode Spectral Band Replication extension data; reference: table 4.55.
cc0591da
RS
1028 *
1029 * @param crc flag indicating the presence of CRC checksum
1030 * @param cnt length of TYPE_FIL syntactic element in bytes
9cc04edf 1031 *
cc0591da
RS
1032 * @return Returns number of bytes consumed from the TYPE_FIL element.
1033 */
1034static int decode_sbr_extension(AACContext * ac, GetBitContext * gb, int crc, int cnt) {
1035 // TODO : sbr_extension implementation
9edae4ad 1036 av_log_missing_feature(ac->avccontext, "SBR", 0);
cc0591da
RS
1037 skip_bits_long(gb, 8*cnt - 4); // -4 due to reading extension type
1038 return cnt;
1039}
1040
9cc04edf 1041/**
62a57fae
RS
1042 * Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
1043 *
1044 * @return Returns number of bytes consumed.
1045 */
1046static int decode_drc_channel_exclusions(DynamicRangeControl *che_drc, GetBitContext * gb) {
1047 int i;
1048 int num_excl_chan = 0;
1049
1050 do {
1051 for (i = 0; i < 7; i++)
1052 che_drc->exclude_mask[num_excl_chan++] = get_bits1(gb);
1053 } while (num_excl_chan < MAX_CHANNELS - 7 && get_bits1(gb));
1054
1055 return num_excl_chan / 7;
1056}
1057
1058/**
9cc04edf
RS
1059 * Decode dynamic range information; reference: table 4.52.
1060 *
1061 * @param cnt length of TYPE_FIL syntactic element in bytes
1062 *
1063 * @return Returns number of bytes consumed.
1064 */
1065static int decode_dynamic_range(DynamicRangeControl *che_drc, GetBitContext * gb, int cnt) {
1066 int n = 1;
1067 int drc_num_bands = 1;
1068 int i;
1069
1070 /* pce_tag_present? */
1071 if(get_bits1(gb)) {
1072 che_drc->pce_instance_tag = get_bits(gb, 4);
1073 skip_bits(gb, 4); // tag_reserved_bits
1074 n++;
1075 }
1076
1077 /* excluded_chns_present? */
1078 if(get_bits1(gb)) {
1079 n += decode_drc_channel_exclusions(che_drc, gb);
1080 }
1081
1082 /* drc_bands_present? */
1083 if (get_bits1(gb)) {
1084 che_drc->band_incr = get_bits(gb, 4);
1085 che_drc->interpolation_scheme = get_bits(gb, 4);
1086 n++;
1087 drc_num_bands += che_drc->band_incr;
1088 for (i = 0; i < drc_num_bands; i++) {
1089 che_drc->band_top[i] = get_bits(gb, 8);
1090 n++;
1091 }
1092 }
1093
1094 /* prog_ref_level_present? */
1095 if (get_bits1(gb)) {
1096 che_drc->prog_ref_level = get_bits(gb, 7);
1097 skip_bits1(gb); // prog_ref_level_reserved_bits
1098 n++;
1099 }
1100
1101 for (i = 0; i < drc_num_bands; i++) {
1102 che_drc->dyn_rng_sgn[i] = get_bits1(gb);
1103 che_drc->dyn_rng_ctl[i] = get_bits(gb, 7);
1104 n++;
1105 }
1106
1107 return n;
1108}
1109
1110/**
1111 * Decode extension data (incomplete); reference: table 4.51.
1112 *
1113 * @param cnt length of TYPE_FIL syntactic element in bytes
1114 *
1115 * @return Returns number of bytes consumed
1116 */
1117static int decode_extension_payload(AACContext * ac, GetBitContext * gb, int cnt) {
cc0591da
RS
1118 int crc_flag = 0;
1119 int res = cnt;
1120 switch (get_bits(gb, 4)) { // extension type
1121 case EXT_SBR_DATA_CRC:
1122 crc_flag++;
1123 case EXT_SBR_DATA:
1124 res = decode_sbr_extension(ac, gb, crc_flag, cnt);
1125 break;
1126 case EXT_DYNAMIC_RANGE:
1127 res = decode_dynamic_range(&ac->che_drc, gb, cnt);
1128 break;
1129 case EXT_FILL:
1130 case EXT_FILL_DATA:
1131 case EXT_DATA_ELEMENT:
1132 default:
1133 skip_bits_long(gb, 8*cnt - 4);
1134 break;
1135 };
1136 return res;
1137}
1138
7d8f3de4
RS
1139/**
1140 * Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
1141 *
1142 * @param decode 1 if tool is used normally, 0 if tool is used in LTP.
1143 * @param coef spectral coefficients
1144 */
1145static void apply_tns(float coef[1024], TemporalNoiseShaping * tns, IndividualChannelStream * ics, int decode) {
1146 const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
1098e8d2 1147 int w, filt, m, i;
7d8f3de4
RS
1148 int bottom, top, order, start, end, size, inc;
1149 float lpc[TNS_MAX_ORDER];
1150
1151 for (w = 0; w < ics->num_windows; w++) {
1152 bottom = ics->num_swb;
1153 for (filt = 0; filt < tns->n_filt[w]; filt++) {
1154 top = bottom;
1155 bottom = FFMAX(0, top - tns->length[w][filt]);
1156 order = tns->order[w][filt];
1157 if (order == 0)
1158 continue;
1159
1be0fc29
VS
1160 // tns_decode_coef
1161 compute_lpc_coefs(tns->coef[w][filt], order, lpc, 0, 0, 0);
7d8f3de4 1162
1dece0d2
RS
1163 start = ics->swb_offset[FFMIN(bottom, mmm)];
1164 end = ics->swb_offset[FFMIN( top, mmm)];
1165 if ((size = end - start) <= 0)
1166 continue;
1167 if (tns->direction[w][filt]) {
1168 inc = -1; start = end - 1;
1169 } else {
1170 inc = 1;
1171 }
1172 start += w * 128;
1173
1174 // ar filter
1175 for (m = 0; m < size; m++, start += inc)
1176 for (i = 1; i <= FFMIN(m, order); i++)
7d8f3de4 1177 coef[start] -= coef[start - i*inc] * lpc[i-1];
1dece0d2
RS
1178 }
1179 }
1180}
1181
cc0591da 1182/**
9cc04edf
RS
1183 * Conduct IMDCT and windowing.
1184 */
1185static void imdct_and_windowing(AACContext * ac, SingleChannelElement * sce) {
1186 IndividualChannelStream * ics = &sce->ics;
1187 float * in = sce->coeffs;
1188 float * out = sce->ret;
1189 float * saved = sce->saved;
848a5815
RS
1190 const float * swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
1191 const float * lwindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
1192 const float * swindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
9cc04edf 1193 float * buf = ac->buf_mdct;
b0f5852a 1194 DECLARE_ALIGNED(16, float, temp[128]);
9cc04edf
RS
1195 int i;
1196
f4990558 1197 // imdct
62a57fae
RS
1198 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
1199 if (ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE)
1200 av_log(ac->avccontext, AV_LOG_WARNING,
1201 "Transition from an ONLY_LONG or LONG_STOP to an EIGHT_SHORT sequence detected. "
1202 "If you heard an audible artifact, please submit the sample to the FFmpeg developers.\n");
b0f5852a
RS
1203 for (i = 0; i < 1024; i += 128)
1204 ff_imdct_half(&ac->mdct_small, buf + i, in + i);
f4990558 1205 } else
b0f5852a 1206 ff_imdct_half(&ac->mdct, buf, in);
f4990558
RS
1207
1208 /* window overlapping
1209 * NOTE: To simplify the overlapping code, all 'meaningless' short to long
1210 * and long to short transitions are considered to be short to short
1211 * transitions. This leaves just two cases (long to long and short to short)
1212 * with a little special sauce for EIGHT_SHORT_SEQUENCE.
1213 */
1214 if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) &&
1215 (ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) {
b0f5852a 1216 ac->dsp.vector_fmul_window( out, saved, buf, lwindow_prev, ac->add_bias, 512);
f4990558 1217 } else {
db38c386
RS
1218 for (i = 0; i < 448; i++)
1219 out[i] = saved[i] + ac->add_bias;
62a57fae 1220
f4990558 1221 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
b0f5852a
RS
1222 ac->dsp.vector_fmul_window(out + 448 + 0*128, saved + 448, buf + 0*128, swindow_prev, ac->add_bias, 64);
1223 ac->dsp.vector_fmul_window(out + 448 + 1*128, buf + 0*128 + 64, buf + 1*128, swindow, ac->add_bias, 64);
1224 ac->dsp.vector_fmul_window(out + 448 + 2*128, buf + 1*128 + 64, buf + 2*128, swindow, ac->add_bias, 64);
1225 ac->dsp.vector_fmul_window(out + 448 + 3*128, buf + 2*128 + 64, buf + 3*128, swindow, ac->add_bias, 64);
1226 ac->dsp.vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, swindow, ac->add_bias, 64);
1227 memcpy( out + 448 + 4*128, temp, 64 * sizeof(float));
f4990558 1228 } else {
b0f5852a 1229 ac->dsp.vector_fmul_window(out + 448, saved + 448, buf, swindow_prev, ac->add_bias, 64);
db38c386 1230 for (i = 576; i < 1024; i++)
b0f5852a 1231 out[i] = buf[i-512] + ac->add_bias;
f4990558
RS
1232 }
1233 }
62a57fae 1234
f4990558
RS
1235 // buffer update
1236 if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
b0f5852a
RS
1237 for (i = 0; i < 64; i++)
1238 saved[i] = temp[64 + i] - ac->add_bias;
1239 ac->dsp.vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, swindow, 0, 64);
1240 ac->dsp.vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, swindow, 0, 64);
1241 ac->dsp.vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, swindow, 0, 64);
1242 memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
f4990558 1243 } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
b0f5852a
RS
1244 memcpy( saved, buf + 512, 448 * sizeof(float));
1245 memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
f4990558 1246 } else { // LONG_STOP or ONLY_LONG
b0f5852a 1247 memcpy( saved, buf + 512, 512 * sizeof(float));
62a57fae
RS
1248 }
1249}
1250
9cc04edf 1251/**
cc0591da
RS
1252 * Apply dependent channel coupling (applied before IMDCT).
1253 *
1254 * @param index index into coupling gain array
1255 */
fbdae895
AC
1256static void apply_dependent_coupling(AACContext * ac, SingleChannelElement * target, ChannelElement * cce, int index) {
1257 IndividualChannelStream * ics = &cce->ch[0].ics;
cc0591da 1258 const uint16_t * offsets = ics->swb_offset;
fbdae895
AC
1259 float * dest = target->coeffs;
1260 const float * src = cce->ch[0].coeffs;
cc0591da
RS
1261 int g, i, group, k, idx = 0;
1262 if(ac->m4ac.object_type == AOT_AAC_LTP) {
1263 av_log(ac->avccontext, AV_LOG_ERROR,
1264 "Dependent coupling is not supported together with LTP\n");
1265 return;
1266 }
1267 for (g = 0; g < ics->num_window_groups; g++) {
1268 for (i = 0; i < ics->max_sfb; i++, idx++) {
fbdae895 1269 if (cce->ch[0].band_type[idx] != ZERO_BT) {
cc0591da
RS
1270 for (group = 0; group < ics->group_len[g]; group++) {
1271 for (k = offsets[i]; k < offsets[i+1]; k++) {
1272 // XXX dsputil-ize
fbdae895 1273 dest[group*128+k] += cce->coup.gain[index][idx] * src[group*128+k];
cc0591da
RS
1274 }
1275 }
1276 }
1277 }
1278 dest += ics->group_len[g]*128;
1279 src += ics->group_len[g]*128;
1280 }
1281}
1282
1283/**
1284 * Apply independent channel coupling (applied after IMDCT).
1285 *
1286 * @param index index into coupling gain array
1287 */
fbdae895 1288static void apply_independent_coupling(AACContext * ac, SingleChannelElement * target, ChannelElement * cce, int index) {
cc0591da 1289 int i;
cc0591da 1290 for (i = 0; i < 1024; i++)
fbdae895 1291 target->ret[i] += cce->coup.gain[index][0] * (cce->ch[0].ret[i] - ac->add_bias);
cc0591da
RS
1292}
1293
9ffd5c1c
RS
1294/**
1295 * channel coupling transformation interface
1296 *
1297 * @param index index into coupling gain array
1298 * @param apply_coupling_method pointer to (in)dependent coupling function
1299 */
1300static void apply_channel_coupling(AACContext * ac, ChannelElement * cc,
88de95c2 1301 enum RawDataBlockType type, int elem_id, enum CouplingPoint coupling_point,
fbdae895 1302 void (*apply_coupling_method)(AACContext * ac, SingleChannelElement * target, ChannelElement * cce, int index))
9ffd5c1c 1303{
88de95c2
AC
1304 int i, c;
1305
1306 for (i = 0; i < MAX_ELEM_ID; i++) {
1307 ChannelElement *cce = ac->che[TYPE_CCE][i];
1308 int index = 0;
1309
1310 if (cce && cce->coup.coupling_point == coupling_point) {
1311 ChannelCoupling * coup = &cce->coup;
1312
1313 for (c = 0; c <= coup->num_coupled; c++) {
1314 if (coup->type[c] == type && coup->id_select[c] == elem_id) {
1315 if (coup->ch_select[c] != 1) {
1316 apply_coupling_method(ac, &cc->ch[0], cce, index);
1317 if (coup->ch_select[c] != 0)
1318 index++;
1319 }
1320 if (coup->ch_select[c] != 2)
1321 apply_coupling_method(ac, &cc->ch[1], cce, index++);
1322 } else
1323 index += 1 + (coup->ch_select[c] == 3);
9ffd5c1c 1324 }
9ffd5c1c
RS
1325 }
1326 }
1327}
1328
1329/**
1330 * Convert spectral data to float samples, applying all supported tools as appropriate.
1331 */
1332static void spectral_to_sample(AACContext * ac) {
1333 int i, type;
88de95c2
AC
1334 for(type = 3; type >= 0; type--) {
1335 for (i = 0; i < MAX_ELEM_ID; i++) {
9ffd5c1c
RS
1336 ChannelElement *che = ac->che[type][i];
1337 if(che) {
88de95c2
AC
1338 if(type <= TYPE_CPE)
1339 apply_channel_coupling(ac, che, type, i, BEFORE_TNS, apply_dependent_coupling);
9ffd5c1c
RS
1340 if(che->ch[0].tns.present)
1341 apply_tns(che->ch[0].coeffs, &che->ch[0].tns, &che->ch[0].ics, 1);
1342 if(che->ch[1].tns.present)
1343 apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1);
88de95c2
AC
1344 if(type <= TYPE_CPE)
1345 apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, apply_dependent_coupling);
1346 if(type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT)
1347 imdct_and_windowing(ac, &che->ch[0]);
9ffd5c1c
RS
1348 if(type == TYPE_CPE)
1349 imdct_and_windowing(ac, &che->ch[1]);
88de95c2
AC
1350 if(type <= TYPE_CCE)
1351 apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, apply_independent_coupling);
62a57fae
RS
1352 }
1353 }
1354 }
1355}
1356
1357static int aac_decode_frame(AVCodecContext * avccontext, void * data, int * data_size, const uint8_t * buf, int buf_size) {
1358 AACContext * ac = avccontext->priv_data;
1359 GetBitContext gb;
1360 enum RawDataBlockType elem_type;
1361 int err, elem_id, data_size_tmp;
1362
1363 init_get_bits(&gb, buf, buf_size*8);
1364
1365 // parse
1366 while ((elem_type = get_bits(&gb, 3)) != TYPE_END) {
1367 elem_id = get_bits(&gb, 4);
1368 err = -1;
1369
1370 if(elem_type == TYPE_SCE && elem_id == 1 &&
1371 !ac->che[TYPE_SCE][elem_id] && ac->che[TYPE_LFE][0]) {
1372 /* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
1373 instead of SCE[0] CPE[0] CPE[0] LFE[0]. If we seem to have
1374 encountered such a stream, transfer the LFE[0] element to SCE[1] */
1375 ac->che[TYPE_SCE][elem_id] = ac->che[TYPE_LFE][0];
1376 ac->che[TYPE_LFE][0] = NULL;
1377 }
f4fae46e 1378 if(elem_type < TYPE_DSE) {
62a57fae
RS
1379 if(!ac->che[elem_type][elem_id])
1380 return -1;
1381 if(elem_type != TYPE_CCE)
1382 ac->che[elem_type][elem_id]->coup.coupling_point = 4;
1383 }
1384
1385 switch (elem_type) {
1386
1387 case TYPE_SCE:
1388 err = decode_ics(ac, &ac->che[TYPE_SCE][elem_id]->ch[0], &gb, 0, 0);
1389 break;
1390
1391 case TYPE_CPE:
1392 err = decode_cpe(ac, &gb, elem_id);
1393 break;
1394
1395 case TYPE_CCE:
93b63b1a 1396 err = decode_cce(ac, &gb, ac->che[TYPE_CCE][elem_id]);
62a57fae
RS
1397 break;
1398
1399 case TYPE_LFE:
1400 err = decode_ics(ac, &ac->che[TYPE_LFE][elem_id]->ch[0], &gb, 0, 0);
1401 break;
1402
1403 case TYPE_DSE:
1404 skip_data_stream_element(&gb);
1405 err = 0;
1406 break;
1407
1408 case TYPE_PCE:
1409 {
1410 enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
1411 memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
1412 if((err = decode_pce(ac, new_che_pos, &gb)))
1413 break;
1414 err = output_configure(ac, ac->che_pos, new_che_pos);
1415 break;
1416 }
1417
1418 case TYPE_FIL:
1419 if (elem_id == 15)
1420 elem_id += get_bits(&gb, 8) - 1;
1421 while (elem_id > 0)
1422 elem_id -= decode_extension_payload(ac, &gb, elem_id);
1423 err = 0; /* FIXME */
1424 break;
1425
1426 default:
1427 err = -1; /* should not happen, but keeps compiler happy */
1428 break;
1429 }
1430
1431 if(err)
1432 return err;
1433 }
1434
1435 spectral_to_sample(ac);
1436
9cc04edf
RS
1437 if (!ac->is_saved) {
1438 ac->is_saved = 1;
1439 *data_size = 0;
848a5815 1440 return buf_size;
9cc04edf
RS
1441 }
1442
1443 data_size_tmp = 1024 * avccontext->channels * sizeof(int16_t);
1444 if(*data_size < data_size_tmp) {
1445 av_log(avccontext, AV_LOG_ERROR,
1446 "Output buffer too small (%d) or trying to output too many samples (%d) for this frame.\n",
1447 *data_size, data_size_tmp);
1448 return -1;
1449 }
1450 *data_size = data_size_tmp;
1451
1452 ac->dsp.float_to_int16_interleave(data, (const float **)ac->output_data, 1024, avccontext->channels);
1453
1454 return buf_size;
1455}
1456
71e9a1b8
RS
1457static av_cold int aac_decode_close(AVCodecContext * avccontext) {
1458 AACContext * ac = avccontext->priv_data;
9edae4ad 1459 int i, type;
71e9a1b8 1460
cc0591da 1461 for (i = 0; i < MAX_ELEM_ID; i++) {
9edae4ad
RS
1462 for(type = 0; type < 4; type++)
1463 av_freep(&ac->che[type][i]);
71e9a1b8
RS
1464 }
1465
1466 ff_mdct_end(&ac->mdct);
1467 ff_mdct_end(&ac->mdct_small);
71e9a1b8
RS
1468 return 0 ;
1469}
1470
1471AVCodec aac_decoder = {
1472 "aac",
1473 CODEC_TYPE_AUDIO,
1474 CODEC_ID_AAC,
1475 sizeof(AACContext),
1476 aac_decode_init,
1477 NULL,
1478 aac_decode_close,
1479 aac_decode_frame,
1480 .long_name = NULL_IF_CONFIG_SMALL("Advanced Audio Coding"),
cc0591da 1481 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
71e9a1b8 1482};