/
a2dp_aac.cc
1555 lines (1367 loc) · 55.9 KB
/
a2dp_aac.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/******************************************************************************
*
* Utility functions to help build and parse the AAC Codec Information
* Element and Media Payload.
*
******************************************************************************/
#define LOG_TAG "a2dp_aac"
#include "bt_target.h"
#include "a2dp_aac.h"
#include <string.h>
#include <base/logging.h>
#include "a2dp_aac_decoder.h"
#include "a2dp_aac_encoder.h"
#include "bt_utils.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
#include "osi/include/properties.h"
#define A2DP_AAC_DEFAULT_BITRATE 320000 // 320 kbps
#define A2DP_AAC_MIN_BITRATE 64000 // 64 kbps
// data type for the AAC Codec Information Element */
// NOTE: bits_per_sample is needed only for AAC encoder initialization.
typedef struct {
uint8_t objectType; /* Object Type */
uint16_t sampleRate; /* Sampling Frequency */
uint8_t channelMode; /* STEREO/MONO */
uint8_t variableBitRateSupport; /* Variable Bit Rate Support*/
uint32_t bitRate; /* Bit rate */
btav_a2dp_codec_bits_per_sample_t bits_per_sample;
} tA2DP_AAC_CIE;
static bool aac_source_caps_configured = false;
static tA2DP_AAC_CIE a2dp_aac_source_caps = {};
/* AAC Source codec capabilities */
static const tA2DP_AAC_CIE a2dp_aac_cbr_source_caps = {
// objectType
A2DP_AAC_OBJECT_TYPE_MPEG2_LC,
// sampleRate
// TODO: AAC 48.0kHz sampling rate should be added back - see b/62301376
A2DP_AAC_SAMPLING_FREQ_44100,
// channelMode
A2DP_AAC_CHANNEL_MODE_STEREO,
// variableBitRateSupport
A2DP_AAC_VARIABLE_BIT_RATE_DISABLED,
// bitRate
A2DP_AAC_DEFAULT_BITRATE,
// bits_per_sample
BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16};
/* AAC Source codec capabilities */
static const tA2DP_AAC_CIE a2dp_aac_vbr_source_caps = {
// objectType
A2DP_AAC_OBJECT_TYPE_MPEG2_LC,
// sampleRate
// TODO: AAC 48.0kHz sampling rate should be added back - see b/62301376
A2DP_AAC_SAMPLING_FREQ_44100,
// channelMode
A2DP_AAC_CHANNEL_MODE_STEREO,
// variableBitRateSupport
A2DP_AAC_VARIABLE_BIT_RATE_ENABLED,
// bitRate
A2DP_AAC_DEFAULT_BITRATE,
// bits_per_sample
BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16};
/* AAC Sink codec capabilities */
static const tA2DP_AAC_CIE a2dp_aac_sink_caps = {
// objectType
A2DP_AAC_OBJECT_TYPE_MPEG2_LC,
// sampleRate
A2DP_AAC_SAMPLING_FREQ_44100 | A2DP_AAC_SAMPLING_FREQ_48000,
// channelMode
A2DP_AAC_CHANNEL_MODE_MONO | A2DP_AAC_CHANNEL_MODE_STEREO,
// variableBitRateSupport
A2DP_AAC_VARIABLE_BIT_RATE_ENABLED,
// bitRate
A2DP_AAC_DEFAULT_BITRATE,
// bits_per_sample
BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16};
/* Default AAC codec configuration */
static const tA2DP_AAC_CIE a2dp_aac_default_config = {
A2DP_AAC_OBJECT_TYPE_MPEG2_LC, // objectType
A2DP_AAC_SAMPLING_FREQ_44100, // sampleRate
A2DP_AAC_CHANNEL_MODE_STEREO, // channelMode
A2DP_AAC_VARIABLE_BIT_RATE_DISABLED, // variableBitRateSupport
A2DP_AAC_DEFAULT_BITRATE, // bitRate
BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 // bits_per_sample
};
static const tA2DP_ENCODER_INTERFACE a2dp_encoder_interface_aac = {
a2dp_aac_encoder_init,
a2dp_aac_encoder_cleanup,
a2dp_aac_feeding_reset,
a2dp_aac_feeding_flush,
a2dp_aac_get_encoder_interval_ms,
a2dp_aac_send_frames,
nullptr // set_transmit_queue_length
};
static const tA2DP_DECODER_INTERFACE a2dp_decoder_interface_aac = {
a2dp_aac_decoder_init,
a2dp_aac_decoder_cleanup,
a2dp_aac_decoder_decode_packet,
nullptr, // decoder_start
nullptr, // decoder_suspend
nullptr, // decoder_configure
};
UNUSED_ATTR static tA2DP_STATUS A2DP_CodecInfoMatchesCapabilityAac(
const tA2DP_AAC_CIE* p_cap, const uint8_t* p_codec_info,
bool is_capability);
// Builds the AAC Media Codec Capabilities byte sequence beginning from the
// LOSC octet. |media_type| is the media type |AVDT_MEDIA_TYPE_*|.
// |p_ie| is a pointer to the AAC Codec Information Element information.
// The result is stored in |p_result|. Returns A2DP_SUCCESS on success,
// otherwise the corresponding A2DP error status code.
static tA2DP_STATUS A2DP_BuildInfoAac(uint8_t media_type,
const tA2DP_AAC_CIE* p_ie,
uint8_t* p_result) {
if (p_ie == NULL || p_result == NULL) {
return A2DP_INVALID_PARAMS;
}
*p_result++ = A2DP_AAC_CODEC_LEN;
*p_result++ = (media_type << 4);
*p_result++ = A2DP_MEDIA_CT_AAC;
// Object Type
if (p_ie->objectType == 0) return A2DP_INVALID_PARAMS;
*p_result++ = p_ie->objectType;
// Sampling Frequency
if (p_ie->sampleRate == 0) return A2DP_INVALID_PARAMS;
*p_result++ = (uint8_t)(p_ie->sampleRate & A2DP_AAC_SAMPLING_FREQ_MASK0);
*p_result = (uint8_t)((p_ie->sampleRate & A2DP_AAC_SAMPLING_FREQ_MASK1) >> 8);
// Channel Mode
if (p_ie->channelMode == 0) return A2DP_INVALID_PARAMS;
*p_result++ |= (p_ie->channelMode & A2DP_AAC_CHANNEL_MODE_MASK);
// Variable Bit Rate Support
*p_result = (p_ie->variableBitRateSupport & A2DP_AAC_VARIABLE_BIT_RATE_MASK);
// Bit Rate
*p_result++ |= (uint8_t)((p_ie->bitRate & A2DP_AAC_BIT_RATE_MASK0) >> 16);
*p_result++ = (uint8_t)((p_ie->bitRate & A2DP_AAC_BIT_RATE_MASK1) >> 8);
*p_result++ = (uint8_t)(p_ie->bitRate & A2DP_AAC_BIT_RATE_MASK2);
return A2DP_SUCCESS;
}
// Parses the AAC Media Codec Capabilities byte sequence beginning from the
// LOSC octet. The result is stored in |p_ie|. The byte sequence to parse is
// |p_codec_info|. If |is_capability| is true, the byte sequence is
// codec capabilities, otherwise is codec configuration.
// Returns A2DP_SUCCESS on success, otherwise the corresponding A2DP error
// status code.
static tA2DP_STATUS A2DP_ParseInfoAac(tA2DP_AAC_CIE* p_ie,
const uint8_t* p_codec_info,
bool is_capability) {
uint8_t losc;
uint8_t media_type;
tA2DP_CODEC_TYPE codec_type;
if (p_ie == NULL || p_codec_info == NULL) return A2DP_INVALID_PARAMS;
// Check the codec capability length
losc = *p_codec_info++;
if (losc != A2DP_AAC_CODEC_LEN) return A2DP_WRONG_CODEC;
media_type = (*p_codec_info++) >> 4;
codec_type = *p_codec_info++;
/* Check the Media Type and Media Codec Type */
if (media_type != AVDT_MEDIA_TYPE_AUDIO || codec_type != A2DP_MEDIA_CT_AAC) {
return A2DP_WRONG_CODEC;
}
p_ie->objectType = *p_codec_info++;
p_ie->sampleRate = (*p_codec_info & A2DP_AAC_SAMPLING_FREQ_MASK0) |
(*(p_codec_info + 1) << 8 & A2DP_AAC_SAMPLING_FREQ_MASK1);
p_codec_info++;
p_ie->channelMode = *p_codec_info & A2DP_AAC_CHANNEL_MODE_MASK;
p_codec_info++;
p_ie->variableBitRateSupport =
*p_codec_info & A2DP_AAC_VARIABLE_BIT_RATE_MASK;
p_ie->bitRate = ((*p_codec_info) << 16 & A2DP_AAC_BIT_RATE_MASK0) |
(*(p_codec_info + 1) << 8 & A2DP_AAC_BIT_RATE_MASK1) |
(*(p_codec_info + 2) & A2DP_AAC_BIT_RATE_MASK2);
p_codec_info += 3;
if (is_capability) {
// NOTE: The checks here are very liberal. We should be using more
// pedantic checks specific to the SRC or SNK as specified in the spec.
if (A2DP_BitsSet(p_ie->objectType) == A2DP_SET_ZERO_BIT)
return A2DP_BAD_OBJ_TYPE;
if (A2DP_BitsSet(p_ie->sampleRate) == A2DP_SET_ZERO_BIT)
return A2DP_BAD_SAMP_FREQ;
if (A2DP_BitsSet(p_ie->channelMode) == A2DP_SET_ZERO_BIT)
return A2DP_BAD_CH_MODE;
return A2DP_SUCCESS;
}
if (A2DP_BitsSet(p_ie->objectType) != A2DP_SET_ONE_BIT)
return A2DP_BAD_OBJ_TYPE;
if (A2DP_BitsSet(p_ie->sampleRate) != A2DP_SET_ONE_BIT)
return A2DP_BAD_SAMP_FREQ;
if (A2DP_BitsSet(p_ie->channelMode) != A2DP_SET_ONE_BIT)
return A2DP_BAD_CH_MODE;
return A2DP_SUCCESS;
}
bool A2DP_IsSourceCodecValidAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE cfg_cie;
/* Use a liberal check when parsing the codec info */
return (A2DP_ParseInfoAac(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) ||
(A2DP_ParseInfoAac(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS);
}
bool A2DP_IsSinkCodecValidAac(UNUSED_ATTR const uint8_t* p_codec_info) {
tA2DP_AAC_CIE cfg_cie;
/* Use a liberal check when parsing the codec info */
return (A2DP_ParseInfoAac(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) ||
(A2DP_ParseInfoAac(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS);
}
bool A2DP_IsPeerSourceCodecValidAac(UNUSED_ATTR const uint8_t* p_codec_info) {
tA2DP_AAC_CIE cfg_cie;
/* Use a liberal check when parsing the codec info */
return (A2DP_ParseInfoAac(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) ||
(A2DP_ParseInfoAac(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS);
}
bool A2DP_IsPeerSinkCodecValidAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE cfg_cie;
/* Use a liberal check when parsing the codec info */
return (A2DP_ParseInfoAac(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) ||
(A2DP_ParseInfoAac(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS);
}
bool A2DP_IsSinkCodecSupportedAac(const uint8_t* p_codec_info) {
return A2DP_CodecInfoMatchesCapabilityAac(&a2dp_aac_sink_caps, p_codec_info,
false) == A2DP_SUCCESS;
}
bool A2DP_IsPeerSourceCodecSupportedAac(const uint8_t* p_codec_info) {
return A2DP_CodecInfoMatchesCapabilityAac(&a2dp_aac_sink_caps, p_codec_info,
true) == A2DP_SUCCESS;
}
// Checks whether A2DP AAC codec configuration matches with a device's codec
// capabilities. |p_cap| is the AAC codec configuration. |p_codec_info| is
// the device's codec capabilities. |is_capability| is true if
// |p_codec_info| contains A2DP codec capability.
// Returns A2DP_SUCCESS if the codec configuration matches with capabilities,
// otherwise the corresponding A2DP error status code.
static tA2DP_STATUS A2DP_CodecInfoMatchesCapabilityAac(
const tA2DP_AAC_CIE* p_cap, const uint8_t* p_codec_info,
bool is_capability) {
tA2DP_STATUS status;
tA2DP_AAC_CIE cfg_cie;
/* parse configuration */
status = A2DP_ParseInfoAac(&cfg_cie, p_codec_info, is_capability);
if (status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: parsing failed %d", __func__, status);
return status;
}
/* verify that each parameter is in range */
LOG_VERBOSE(LOG_TAG, "%s: Object Type peer: 0x%x, capability 0x%x", __func__,
cfg_cie.objectType, p_cap->objectType);
LOG_VERBOSE(LOG_TAG, "%s: Sample Rate peer: %u, capability %u", __func__,
cfg_cie.sampleRate, p_cap->sampleRate);
LOG_VERBOSE(LOG_TAG, "%s: Channel Mode peer: 0x%x, capability 0x%x", __func__,
cfg_cie.channelMode, p_cap->channelMode);
LOG_VERBOSE(
LOG_TAG, "%s: Variable Bit Rate Support peer: 0x%x, capability 0x%x",
__func__, cfg_cie.variableBitRateSupport, p_cap->variableBitRateSupport);
LOG_VERBOSE(LOG_TAG, "%s: Bit Rate peer: %u, capability %u", __func__,
cfg_cie.bitRate, p_cap->bitRate);
/* Object Type */
if ((cfg_cie.objectType & p_cap->objectType) == 0) return A2DP_BAD_OBJ_TYPE;
/* Sample Rate */
if ((cfg_cie.sampleRate & p_cap->sampleRate) == 0) return A2DP_BAD_SAMP_FREQ;
/* Channel Mode */
if ((cfg_cie.channelMode & p_cap->channelMode) == 0) return A2DP_NS_CH_MODE;
return A2DP_SUCCESS;
}
bool A2DP_UsesRtpHeaderAac(UNUSED_ATTR bool content_protection_enabled,
UNUSED_ATTR const uint8_t* p_codec_info) {
return true;
}
const char* A2DP_CodecNameAac(UNUSED_ATTR const uint8_t* p_codec_info) {
return "AAC";
}
bool A2DP_CodecTypeEqualsAac(const uint8_t* p_codec_info_a,
const uint8_t* p_codec_info_b) {
tA2DP_AAC_CIE aac_cie_a;
tA2DP_AAC_CIE aac_cie_b;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status =
A2DP_ParseInfoAac(&aac_cie_a, p_codec_info_a, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return false;
}
a2dp_status = A2DP_ParseInfoAac(&aac_cie_b, p_codec_info_b, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return false;
}
return true;
}
bool A2DP_CodecEqualsAac(const uint8_t* p_codec_info_a,
const uint8_t* p_codec_info_b) {
tA2DP_AAC_CIE aac_cie_a;
tA2DP_AAC_CIE aac_cie_b;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status =
A2DP_ParseInfoAac(&aac_cie_a, p_codec_info_a, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return false;
}
a2dp_status = A2DP_ParseInfoAac(&aac_cie_b, p_codec_info_b, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return false;
}
return (aac_cie_a.objectType == aac_cie_b.objectType) &&
(aac_cie_a.sampleRate == aac_cie_b.sampleRate) &&
(aac_cie_a.channelMode == aac_cie_b.channelMode) &&
(aac_cie_a.variableBitRateSupport ==
aac_cie_b.variableBitRateSupport) &&
(aac_cie_a.bitRate == aac_cie_b.bitRate);
}
int A2DP_GetTrackSampleRateAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
switch (aac_cie.sampleRate) {
case A2DP_AAC_SAMPLING_FREQ_8000:
return 8000;
case A2DP_AAC_SAMPLING_FREQ_11025:
return 11025;
case A2DP_AAC_SAMPLING_FREQ_12000:
return 12000;
case A2DP_AAC_SAMPLING_FREQ_16000:
return 16000;
case A2DP_AAC_SAMPLING_FREQ_22050:
return 22050;
case A2DP_AAC_SAMPLING_FREQ_24000:
return 24000;
case A2DP_AAC_SAMPLING_FREQ_32000:
return 32000;
case A2DP_AAC_SAMPLING_FREQ_44100:
return 44100;
case A2DP_AAC_SAMPLING_FREQ_48000:
return 48000;
case A2DP_AAC_SAMPLING_FREQ_64000:
return 64000;
case A2DP_AAC_SAMPLING_FREQ_88200:
return 88200;
case A2DP_AAC_SAMPLING_FREQ_96000:
return 96000;
}
return -1;
}
int A2DP_GetTrackBitsPerSampleAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
// NOTE: The bits per sample never changes for AAC
return 16;
}
int A2DP_GetTrackChannelCountAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
switch (aac_cie.channelMode) {
case A2DP_AAC_CHANNEL_MODE_MONO:
return 1;
case A2DP_AAC_CHANNEL_MODE_STEREO:
return 2;
}
return -1;
}
int A2DP_GetSinkTrackChannelTypeAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
switch (aac_cie.channelMode) {
case A2DP_AAC_CHANNEL_MODE_MONO:
return 1;
case A2DP_AAC_CHANNEL_MODE_STEREO:
return 3;
}
return -1;
}
int A2DP_GetObjectTypeCodeAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
switch (aac_cie.objectType) {
case A2DP_AAC_OBJECT_TYPE_MPEG2_LC:
case A2DP_AAC_OBJECT_TYPE_MPEG4_LC:
case A2DP_AAC_OBJECT_TYPE_MPEG4_LTP:
case A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE:
return aac_cie.objectType;
default:
break;
}
return -1;
}
int A2DP_GetChannelModeCodeAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
switch (aac_cie.channelMode) {
case A2DP_AAC_CHANNEL_MODE_MONO:
case A2DP_AAC_CHANNEL_MODE_STEREO:
return aac_cie.channelMode;
default:
break;
}
return -1;
}
int A2DP_GetVariableBitRateSupportAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
switch (aac_cie.variableBitRateSupport) {
case A2DP_AAC_VARIABLE_BIT_RATE_ENABLED:
case A2DP_AAC_VARIABLE_BIT_RATE_DISABLED:
return aac_cie.variableBitRateSupport;
default:
break;
}
return -1;
}
int A2DP_GetBitRateAac(const uint8_t* p_codec_info) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
return aac_cie.bitRate;
}
int A2DP_ComputeMaxBitRateAac(const uint8_t* p_codec_info, uint16_t mtu) {
tA2DP_AAC_CIE aac_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__,
a2dp_status);
return -1;
}
int sampling_freq = A2DP_GetTrackSampleRateAac(p_codec_info);
if (sampling_freq == -1) return -1;
int pcm_channel_samples_per_frame = 0;
switch (aac_cie.objectType) {
case A2DP_AAC_OBJECT_TYPE_MPEG2_LC:
case A2DP_AAC_OBJECT_TYPE_MPEG4_LC:
pcm_channel_samples_per_frame = 1024;
break;
case A2DP_AAC_OBJECT_TYPE_MPEG4_LTP:
case A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE:
// TODO: The MPEG documentation doesn't specify the value.
break;
default:
break;
}
if (pcm_channel_samples_per_frame == 0) return -1;
// See Section 3.2.1 Estimating Average Frame Size from
// the aacEncoder.pdf document included with the AAC source code.
return (8 * mtu * sampling_freq) / pcm_channel_samples_per_frame;
}
bool A2DP_GetPacketTimestampAac(const uint8_t* p_codec_info,
const uint8_t* p_data, uint32_t* p_timestamp) {
// TODO: Is this function really codec-specific?
*p_timestamp = *(const uint32_t*)p_data;
return true;
}
bool A2DP_BuildCodecHeaderAac(UNUSED_ATTR const uint8_t* p_codec_info,
UNUSED_ATTR BT_HDR* p_buf,
UNUSED_ATTR uint16_t frames_per_packet) {
return true;
}
std::string A2DP_CodecInfoStringAac(const uint8_t* p_codec_info) {
std::stringstream res;
std::string field;
tA2DP_STATUS a2dp_status;
tA2DP_AAC_CIE aac_cie;
a2dp_status = A2DP_ParseInfoAac(&aac_cie, p_codec_info, true);
if (a2dp_status != A2DP_SUCCESS) {
res << "A2DP_ParseInfoAac fail: " << loghex(a2dp_status);
return res.str();
}
res << "\tname: AAC\n";
// Object type
field.clear();
AppendField(&field, (aac_cie.objectType == 0), "NONE");
AppendField(&field, (aac_cie.objectType & A2DP_AAC_OBJECT_TYPE_MPEG2_LC),
"(MPEG-2 AAC LC)");
AppendField(&field, (aac_cie.objectType & A2DP_AAC_OBJECT_TYPE_MPEG4_LC),
"(MPEG-4 AAC LC)");
AppendField(&field, (aac_cie.objectType & A2DP_AAC_OBJECT_TYPE_MPEG4_LTP),
"(MPEG-4 AAC LTP)");
AppendField(&field,
(aac_cie.objectType & A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE),
"(MPEG-4 AAC Scalable)");
res << "\tobjectType: " << field << " (" << loghex(aac_cie.objectType)
<< ")\n";
// Sample frequency
field.clear();
AppendField(&field, (aac_cie.sampleRate == 0), "NONE");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_8000),
"8000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_11025),
"11025");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_12000),
"12000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_16000),
"16000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_22050),
"22050");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_24000),
"24000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_32000),
"32000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_44100),
"44100");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_48000),
"48000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_64000),
"64000");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_88200),
"88200");
AppendField(&field, (aac_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_96000),
"96000");
res << "\tsamp_freq: " << field << " (" << loghex(aac_cie.sampleRate)
<< ")\n";
// Channel mode
field.clear();
AppendField(&field, (aac_cie.channelMode == 0), "NONE");
AppendField(&field, (aac_cie.channelMode == A2DP_AAC_CHANNEL_MODE_MONO),
"Mono");
AppendField(&field, (aac_cie.channelMode == A2DP_AAC_CHANNEL_MODE_STEREO),
"Stereo");
res << "\tch_mode: " << field << " (" << loghex(aac_cie.channelMode) << ")\n";
// Variable bit rate support
res << "\tvariableBitRateSupport: " << std::boolalpha
<< (aac_cie.variableBitRateSupport != 0) << "\n";
// Bit rate
res << "\tbitRate: " << std::to_string(aac_cie.bitRate) << "\n";
return res.str();
}
const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceAac(
const uint8_t* p_codec_info) {
if (!A2DP_IsSourceCodecValidAac(p_codec_info)) return NULL;
return &a2dp_encoder_interface_aac;
}
const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceAac(
const uint8_t* p_codec_info) {
if (!A2DP_IsSinkCodecValidAac(p_codec_info)) return NULL;
return &a2dp_decoder_interface_aac;
}
bool A2DP_AdjustCodecAac(uint8_t* p_codec_info) {
tA2DP_AAC_CIE cfg_cie;
// Nothing to do: just verify the codec info is valid
if (A2DP_ParseInfoAac(&cfg_cie, p_codec_info, true) != A2DP_SUCCESS)
return false;
return true;
}
btav_a2dp_codec_index_t A2DP_SourceCodecIndexAac(
UNUSED_ATTR const uint8_t* p_codec_info) {
return BTAV_A2DP_CODEC_INDEX_SOURCE_AAC;
}
btav_a2dp_codec_index_t A2DP_SinkCodecIndexAac(
UNUSED_ATTR const uint8_t* p_codec_info) {
return BTAV_A2DP_CODEC_INDEX_SINK_AAC;
}
const char* A2DP_CodecIndexStrAac(void) { return "AAC"; }
const char* A2DP_CodecIndexStrAacSink(void) { return "AAC SINK"; }
void aac_source_caps_initialize() {
if (aac_source_caps_configured) {
return;
}
a2dp_aac_source_caps =
osi_property_get_bool("persist.bluetooth.a2dp_aac.vbr_supported", false)
? a2dp_aac_vbr_source_caps
: a2dp_aac_cbr_source_caps;
aac_source_caps_configured = true;
}
bool A2DP_InitCodecConfigAac(AvdtpSepConfig* p_cfg) {
aac_source_caps_initialize();
if (A2DP_BuildInfoAac(AVDT_MEDIA_TYPE_AUDIO, &a2dp_aac_source_caps,
p_cfg->codec_info) != A2DP_SUCCESS) {
return false;
}
#if (BTA_AV_CO_CP_SCMS_T == TRUE)
/* Content protection info - support SCMS-T */
uint8_t* p = p_cfg->protect_info;
*p++ = AVDT_CP_LOSC;
UINT16_TO_STREAM(p, AVDT_CP_SCMS_T_ID);
p_cfg->num_protect = 1;
#endif
return true;
}
bool A2DP_InitCodecConfigAacSink(AvdtpSepConfig* p_cfg) {
return A2DP_BuildInfoAac(AVDT_MEDIA_TYPE_AUDIO, &a2dp_aac_sink_caps,
p_cfg->codec_info) == A2DP_SUCCESS;
}
UNUSED_ATTR static void build_codec_config(const tA2DP_AAC_CIE& config_cie,
btav_a2dp_codec_config_t* result) {
if (config_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_44100)
result->sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
if (config_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_48000)
result->sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
if (config_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_88200)
result->sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_88200;
if (config_cie.sampleRate & A2DP_AAC_SAMPLING_FREQ_96000)
result->sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_96000;
result->bits_per_sample = config_cie.bits_per_sample;
if (config_cie.channelMode & A2DP_AAC_CHANNEL_MODE_MONO)
result->channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
if (config_cie.channelMode & A2DP_AAC_CHANNEL_MODE_STEREO) {
result->channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
}
}
A2dpCodecConfigAacSource::A2dpCodecConfigAacSource(
btav_a2dp_codec_priority_t codec_priority)
: A2dpCodecConfigAacBase(BTAV_A2DP_CODEC_INDEX_SOURCE_AAC,
A2DP_CodecIndexStrAac(), codec_priority, true) {
aac_source_caps_initialize();
// Compute the local capability
if (a2dp_aac_source_caps.sampleRate & A2DP_AAC_SAMPLING_FREQ_44100) {
codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
}
if (a2dp_aac_source_caps.sampleRate & A2DP_AAC_SAMPLING_FREQ_48000) {
codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
}
if (a2dp_aac_source_caps.sampleRate & A2DP_AAC_SAMPLING_FREQ_88200) {
codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_88200;
}
if (a2dp_aac_source_caps.sampleRate & A2DP_AAC_SAMPLING_FREQ_96000) {
codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_96000;
}
codec_local_capability_.bits_per_sample =
a2dp_aac_source_caps.bits_per_sample;
if (a2dp_aac_source_caps.channelMode & A2DP_AAC_CHANNEL_MODE_MONO) {
codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
}
if (a2dp_aac_source_caps.channelMode & A2DP_AAC_CHANNEL_MODE_STEREO) {
codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
}
}
A2dpCodecConfigAacSource::~A2dpCodecConfigAacSource() {}
bool A2dpCodecConfigAacSource::init() {
if (!isValid()) return false;
// Load the encoder
if (!A2DP_LoadEncoderAac()) {
LOG_ERROR(LOG_TAG, "%s: cannot load the encoder", __func__);
return false;
}
return true;
}
bool A2dpCodecConfigAacSource::useRtpHeaderMarkerBit() const { return true; }
//
// Selects the best sample rate from |sampleRate|.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_best_sample_rate(uint16_t sampleRate,
tA2DP_AAC_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_96000) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_96000;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_96000;
return true;
}
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_88200) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_88200;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_88200;
return true;
}
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_48000) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_48000;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
return true;
}
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_44100) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_44100;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
return true;
}
return false;
}
//
// Selects the audio sample rate from |p_codec_audio_config|.
// |sampleRate| contains the capability.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_audio_sample_rate(
const btav_a2dp_codec_config_t* p_codec_audio_config, uint16_t sampleRate,
tA2DP_AAC_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) {
switch (p_codec_audio_config->sample_rate) {
case BTAV_A2DP_CODEC_SAMPLE_RATE_44100:
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_44100) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_44100;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
return true;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_48000:
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_48000) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_48000;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
return true;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_88200:
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_88200) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_88200;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_88200;
return true;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_96000:
if (sampleRate & A2DP_AAC_SAMPLING_FREQ_96000) {
p_result->sampleRate = A2DP_AAC_SAMPLING_FREQ_96000;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_96000;
return true;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_176400:
case BTAV_A2DP_CODEC_SAMPLE_RATE_192000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_16000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_24000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_NONE:
break;
}
return false;
}
//
// Selects the best bits per sample from |bits_per_sample|.
// |bits_per_sample| contains the capability.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_best_bits_per_sample(
btav_a2dp_codec_bits_per_sample_t bits_per_sample, tA2DP_AAC_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
if (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32;
p_result->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32;
return true;
}
if (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24;
p_result->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24;
return true;
}
if (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
p_result->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
return true;
}
return false;
}
//
// Selects the audio bits per sample from |p_codec_audio_config|.
// |bits_per_sample| contains the capability.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_audio_bits_per_sample(
const btav_a2dp_codec_config_t* p_codec_audio_config,
btav_a2dp_codec_bits_per_sample_t bits_per_sample, tA2DP_AAC_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
switch (p_codec_audio_config->bits_per_sample) {
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16:
if (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
p_result->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
return true;
}
break;
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24:
if (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24;
p_result->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24;
return true;
}
break;
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32:
if (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32;
p_result->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32;
return true;
}
break;
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE:
break;
}
return false;
}
//
// Selects the best channel mode from |channelMode|.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_best_channel_mode(uint8_t channelMode,
tA2DP_AAC_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
if (channelMode & A2DP_AAC_CHANNEL_MODE_STEREO) {
p_result->channelMode = A2DP_AAC_CHANNEL_MODE_STEREO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
return true;
}
if (channelMode & A2DP_AAC_CHANNEL_MODE_MONO) {
p_result->channelMode = A2DP_AAC_CHANNEL_MODE_MONO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
return true;
}
return false;
}
//
// Selects the audio channel mode from |p_codec_audio_config|.
// |channelMode| contains the capability.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_audio_channel_mode(