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
|
/******************************************************************************
*
* Copyright (C) 2003-2012 Broadcom Corporation
*
* 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.
*
******************************************************************************/
/******************************************************************************
*
* This file contains the down sampling utility to convert PCM samples in
* 16k/32k/48k/44.1k/22050/11025 sampling rate into 8K/16bits samples
* required for SCO channel format. One API function isprovided and only
* possible to be used when transmitting SCO data is sent via HCI
* interface.
*
******************************************************************************/
#include <string.h>
#include "bta_api.h"
#include "bta_sys.h"
#if (BTM_SCO_HCI_INCLUDED == TRUE)
#ifndef BTA_DM_SCO_DEBUG
#define BTA_DM_SCO_DEBUG FALSE
#endif
/*****************************************************************************
** Constants
*****************************************************************************/
#define BTA_DM_PCM_OVERLAP_SIZE 48
#define BTA_DM_PCM_SMPL_RATE_44100 44100
#define BTA_DM_PCM_SMPL_RATE_22050 22050
#define BTA_DM_PCM_SMPL_RATE_11025 11025
/*****************************************************************************
** Data types for PCM Resampling utility
*****************************************************************************/
typedef INT32 (*PCONVERT_TO_BT_FILTERED) (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps,INT32 *pLastCurPos, UINT8 *pOverlapArea);
typedef INT32 (*PCONVERT_TO_BT_NOFILTER) (void *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps);
typedef struct
{
UINT8 overlap_area[BTA_DM_PCM_OVERLAP_SIZE * 4];
UINT32 cur_pos; /* current position */
UINT32 src_sps; /* samples per second (source audio data) */
PCONVERT_TO_BT_FILTERED filter; /* the action function to do the
conversion 44100, 22050, 11025*/
PCONVERT_TO_BT_NOFILTER nofilter; /* the action function to do
the conversion 48000, 32000, 16000*/
UINT32 bits; /* number of bits per pcm sample */
UINT32 n_channels; /* number of channels (i.e. mono(1), stereo(2)...) */
UINT32 sample_size;
UINT32 can_be_filtered;
UINT32 divisor;
} tBTA_DM_PCM_RESAMPLE_CB;
tBTA_DM_PCM_RESAMPLE_CB bta_dm_pcm_cb;
/*****************************************************************************
** Macro Definition
*****************************************************************************/
#define CHECK_SATURATION16(x) \
if (x > 32767) \
x = 32767; \
else if (x < -32768) \
x = -32768;
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#define CONVERT_44100_TO_BLUETOOTH(pStart, pEnd) \
{ \
INT32 out1, out2, out3, out4, out5; \
SRC_TYPE *pS = (SRC_TYPE *)pStart; \
SRC_TYPE *pSEnd = (SRC_TYPE *)pEnd; \
\
while (pS < pSEnd) \
{ \
CurrentPos -= 8000; \
\
if (CurrentPos >= 0) \
{ \
pS += SRC_CHANNELS; \
continue; \
} \
CurrentPos += dwSrcSps; \
\
out1 = (SRC_SAMPLE(0) * 1587) \
+ ((SRC_SAMPLE(1) + SRC_SAMPLE(-1)) * 1522) \
+ ((SRC_SAMPLE(2) + SRC_SAMPLE(-2)) * 1337) \
+ ((SRC_SAMPLE(3) + SRC_SAMPLE(-3)) * 1058); \
\
out1 = out1 / 30000; \
\
out2 = ((SRC_SAMPLE(4) + SRC_SAMPLE(-4)) * 725) \
+ ((SRC_SAMPLE(5) + SRC_SAMPLE(-5)) * 384) \
+ ((SRC_SAMPLE(6) + SRC_SAMPLE(-6)) * 79); \
\
out2 = out2 / 30000; \
\
out3 = ((SRC_SAMPLE(7) + SRC_SAMPLE(-7)) * 156) \
+ ((SRC_SAMPLE(8) + SRC_SAMPLE(-8)) * 298) \
+ ((SRC_SAMPLE(9) + SRC_SAMPLE(-9)) * 345); \
\
out3 = out3 / 30000; \
\
out4 = ((SRC_SAMPLE(10) + SRC_SAMPLE(-10)) * 306) \
+ ((SRC_SAMPLE(11) + SRC_SAMPLE(-11)) * 207) \
+ ((SRC_SAMPLE(12) + SRC_SAMPLE(-12)) * 78); \
\
out4 = out4 / 30000; \
\
out5 = out1 + out2 - out3 - out4; \
\
CHECK_SATURATION16(out5); \
*psBtOut++ = (INT16)out5; \
\
pS += SRC_CHANNELS; \
} \
}
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#define CONVERT_22050_TO_BLUETOOTH(pStart, pEnd) \
{ \
INT32 out1, out2, out3, out4, out5; \
SRC_TYPE *pS = (SRC_TYPE *)pStart; \
SRC_TYPE *pSEnd = (SRC_TYPE *)pEnd; \
\
while (pS < pSEnd) \
{ \
CurrentPos -= 8000; \
\
if (CurrentPos >= 0) \
{ \
pS += SRC_CHANNELS; \
continue; \
} \
CurrentPos += dwSrcSps; \
\
out1 = (SRC_SAMPLE(0) * 2993) \
+ ((SRC_SAMPLE(1) + SRC_SAMPLE(-1)) * 2568) \
+ ((SRC_SAMPLE(2) + SRC_SAMPLE(-2)) * 1509) \
+ ((SRC_SAMPLE(3) + SRC_SAMPLE(-3)) * 331); \
\
out1 = out1 / 30000; \
\
out2 = ((SRC_SAMPLE(4) + SRC_SAMPLE(-4)) * 454) \
+ ((SRC_SAMPLE(5) + SRC_SAMPLE(-5)) * 620) \
+ ((SRC_SAMPLE(6) + SRC_SAMPLE(-6)) * 305); \
\
out2 = out2 / 30000; \
\
out3 = ((SRC_SAMPLE(7) + SRC_SAMPLE(-7)) * 127) \
+ ((SRC_SAMPLE(8) + SRC_SAMPLE(-8)) * 350) \
+ ((SRC_SAMPLE(9) + SRC_SAMPLE(-9)) * 265) \
+ ((SRC_SAMPLE(10) + SRC_SAMPLE(-10)) * 6); \
\
out3 = out3 / 30000; \
\
out4 = ((SRC_SAMPLE(11) + SRC_SAMPLE(-11)) * 201); \
\
out4 = out4 / 30000; \
\
out5 = out1 - out2 + out3 - out4; \
\
CHECK_SATURATION16(out5); \
*psBtOut++ = (INT16)out5; \
\
pS += SRC_CHANNELS; \
} \
}
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#define CONVERT_11025_TO_BLUETOOTH(pStart, pEnd) \
{ \
INT32 out1; \
SRC_TYPE *pS = (SRC_TYPE *)pStart; \
SRC_TYPE *pSEnd = (SRC_TYPE *)pEnd; \
\
while (pS < pSEnd) \
{ \
CurrentPos -= 8000; \
\
if (CurrentPos >= 0) \
{ \
pS += SRC_CHANNELS; \
continue; \
} \
CurrentPos += dwSrcSps; \
\
out1 = (SRC_SAMPLE(0) * 6349) \
+ ((SRC_SAMPLE(1) + SRC_SAMPLE(-1)) * 2874) \
- ((SRC_SAMPLE(2) + SRC_SAMPLE(-2)) * 1148) \
- ((SRC_SAMPLE(3) + SRC_SAMPLE(-3)) * 287) \
+ ((SRC_SAMPLE(4) + SRC_SAMPLE(-4)) * 675) \
- ((SRC_SAMPLE(5) + SRC_SAMPLE(-5)) * 258) \
- ((SRC_SAMPLE(6) + SRC_SAMPLE(-6)) * 206) \
+ ((SRC_SAMPLE(7) + SRC_SAMPLE(-7)) * 266); \
\
out1 = out1 / 30000; \
\
CHECK_SATURATION16(out1); \
*psBtOut++ = (INT16)out1; \
\
pS += SRC_CHANNELS; \
} \
}
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#undef SRC_CHANNELS
#undef SRC_SAMPLE
#undef SRC_TYPE
#define SRC_TYPE UINT8
#define SRC_CHANNELS 1
#define SRC_SAMPLE(x) ((pS[x] - 0x80) << 8)
/*****************************************************************************
** Local Function
*****************************************************************************/
INT32 Convert_8M_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
SRC_TYPE *pIn, *pInEnd;
SRC_TYPE *pOv, *pOvEnd;
INT16 *psBtOut = (INT16 *)pDst;
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG1("Convert_8M_ToBT_Filtered, CurrentPos %d\n", CurrentPos);
#endif
memcpy (pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 2), pSrc, BTA_DM_PCM_OVERLAP_SIZE * 2);
pOv = (SRC_TYPE *)(pOverlapArea + BTA_DM_PCM_OVERLAP_SIZE);
pOvEnd = (SRC_TYPE *)(pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 3));
pIn = (SRC_TYPE *)(pSrc + BTA_DM_PCM_OVERLAP_SIZE);
pInEnd = (SRC_TYPE *)(pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - \
BTA_DM_PCM_OVERLAP_SIZE);
if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_44100)
{
CONVERT_44100_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_44100_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_22050)
{
CONVERT_22050_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_22050_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_11025)
{
CONVERT_11025_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_11025_TO_BLUETOOTH(pIn, pInEnd);
}
memcpy (pOverlapArea, pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - \
(BTA_DM_PCM_OVERLAP_SIZE * 2), BTA_DM_PCM_OVERLAP_SIZE * 2);
*pLastCurPos = CurrentPos;
return (psBtOut - (INT16 *)pDst);
}
INT32 Convert_8M_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UINT32 dwSrcSps)
{
INT32 CurrentPos;
UINT8 *pbSrc = (UINT8 *)pSrc;
INT16 *psDst = (INT16 *)pDst;
INT16 sWorker;
// start at dwSpsSrc / 2, decrement by 8000
//
CurrentPos = (dwSrcSps >> 1);
while (dwSrcSamples--)
{
CurrentPos -= 8000;
if (CurrentPos >= 0)
pbSrc++;
else
{
sWorker = *pbSrc++;
sWorker -= 0x80;
sWorker <<= 8;
*psDst++ = sWorker;
CurrentPos += dwSrcSps;
}
}
return (psDst - (INT16 *)pDst);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#undef SRC_CHANNELS
#undef SRC_SAMPLE
#undef SRC_TYPE
#define SRC_TYPE INT16
#define SRC_CHANNELS 1
#define SRC_SAMPLE(x) pS[x]
INT32 Convert_16M_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
SRC_TYPE *pIn, *pInEnd;
SRC_TYPE *pOv, *pOvEnd;
INT16 *psBtOut = (INT16 *)pDst;
memcpy (pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 2), pSrc, BTA_DM_PCM_OVERLAP_SIZE * 2);
pOv = (SRC_TYPE *)(pOverlapArea + BTA_DM_PCM_OVERLAP_SIZE);
pOvEnd = (SRC_TYPE *)(pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 3));
pIn = (SRC_TYPE *)(pSrc + BTA_DM_PCM_OVERLAP_SIZE);
pInEnd = (SRC_TYPE *)(pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - BTA_DM_PCM_OVERLAP_SIZE);
if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_44100)
{
CONVERT_44100_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_44100_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_22050)
{
CONVERT_22050_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_22050_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_11025)
{
CONVERT_11025_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_11025_TO_BLUETOOTH(pIn, pInEnd);
}
memcpy (pOverlapArea, pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - \
(BTA_DM_PCM_OVERLAP_SIZE * 2), BTA_DM_PCM_OVERLAP_SIZE * 2);
*pLastCurPos = CurrentPos;
return (psBtOut - (INT16 *)pDst);
}
INT32 Convert_16M_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UINT32 dwSrcSps)
{
INT32 CurrentPos;
INT16 *psSrc = (INT16 *)pSrc;
INT16 *psDst = (INT16 *)pDst;
// start at dwSpsSrc / 2, decrement by 8000
//
CurrentPos = (dwSrcSps >> 1);
while (dwSrcSamples--)
{
CurrentPos -= 8000;
if (CurrentPos >= 0)
psSrc++;
else
{
*psDst++ = *psSrc++;
CurrentPos += dwSrcSps;
}
}
return (psDst - (INT16 *)pDst);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#undef SRC_CHANNELS
#undef SRC_SAMPLE
#undef SRC_TYPE
#define SRC_TYPE UINT8
#define SRC_CHANNELS 2
#define SRC_SAMPLE(x) ((((pS[x * 2] - 0x80) << 8) + ((pS[(x * 2) + 1] - 0x80) << 8)) >> 1)
INT32 Convert_8S_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
SRC_TYPE *pIn, *pInEnd;
SRC_TYPE *pOv, *pOvEnd;
INT16 *psBtOut = (INT16 *)pDst;
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG5("Convert_8S_ToBT_Filtered CurrentPos %d, SRC_TYPE %d, SRC_CHANNELS %d, \
dwSrcSamples %d, dwSrcSps %d", CurrentPos, sizeof (SRC_TYPE), SRC_CHANNELS, \
dwSrcSamples, dwSrcSps);
#endif
memcpy (pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 2), pSrc, BTA_DM_PCM_OVERLAP_SIZE * 2);
pOv = (SRC_TYPE *)(pOverlapArea + BTA_DM_PCM_OVERLAP_SIZE);
pOvEnd = (SRC_TYPE *)(pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 3));
pIn = (SRC_TYPE *)(pSrc + BTA_DM_PCM_OVERLAP_SIZE);
pInEnd = (SRC_TYPE *)(pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - BTA_DM_PCM_OVERLAP_SIZE);
if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_44100)
{
CONVERT_44100_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_44100_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_22050)
{
CONVERT_22050_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_22050_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_11025)
{
CONVERT_11025_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_11025_TO_BLUETOOTH(pIn, pInEnd);
}
memcpy (pOverlapArea, pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - \
(BTA_DM_PCM_OVERLAP_SIZE * 2), BTA_DM_PCM_OVERLAP_SIZE * 2);
*pLastCurPos = CurrentPos;
return (psBtOut - (INT16 *)pDst);
}
INT32 Convert_8S_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UINT32 dwSrcSps)
{
INT32 CurrentPos;
UINT8 *pbSrc = (UINT8 *)pSrc;
INT16 *psDst = (INT16 *)pDst;
INT16 sWorker, sWorker2;
// start at dwSpsSrc / 2, decrement by 8000
//
CurrentPos = (dwSrcSps >> 1);
while (dwSrcSamples--)
{
CurrentPos -= 8000;
if (CurrentPos >= 0)
pbSrc += 2;
else
{
sWorker = *(unsigned char *)pbSrc;
sWorker -= 0x80;
sWorker <<= 8;
pbSrc++;
sWorker2 = *(unsigned char *)pbSrc;
sWorker2 -= 0x80;
sWorker2 <<= 8;
pbSrc++;
sWorker += sWorker2;
sWorker >>= 1;
*psDst++ = sWorker;
CurrentPos += dwSrcSps;
}
}
return (psDst - (INT16 *)pDst);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
//
#undef SRC_CHANNELS
#undef SRC_SAMPLE
#undef SRC_TYPE
#define SRC_TYPE INT16
#define SRC_CHANNELS 2
#define SRC_SAMPLE(x) ((pS[x * 2] + pS[(x * 2) + 1]) >> 1)
INT32 Convert_16S_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
SRC_TYPE *pIn, *pInEnd;
SRC_TYPE *pOv, *pOvEnd;
INT16 *psBtOut = (INT16 *)pDst;
memcpy (pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 2), pSrc, BTA_DM_PCM_OVERLAP_SIZE * 2);
pOv = (SRC_TYPE *)(pOverlapArea + BTA_DM_PCM_OVERLAP_SIZE);
pOvEnd = (SRC_TYPE *)(pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 3));
pIn = (SRC_TYPE *)(pSrc + BTA_DM_PCM_OVERLAP_SIZE);
pInEnd = (SRC_TYPE *)(pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - BTA_DM_PCM_OVERLAP_SIZE);
if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_44100)
{
CONVERT_44100_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_44100_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_22050)
{
CONVERT_22050_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_22050_TO_BLUETOOTH(pIn, pInEnd);
}
else if (dwSrcSps == BTA_DM_PCM_SMPL_RATE_11025)
{
CONVERT_11025_TO_BLUETOOTH(pOv, pOvEnd);
CONVERT_11025_TO_BLUETOOTH(pIn, pInEnd);
}
memcpy (pOverlapArea, pSrc + (dwSrcSamples * SRC_CHANNELS * sizeof (SRC_TYPE)) - \
(BTA_DM_PCM_OVERLAP_SIZE * 2), BTA_DM_PCM_OVERLAP_SIZE * 2);
*pLastCurPos = CurrentPos;
return (psBtOut - (INT16 *)pDst);
}
INT32 Convert_16S_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UINT32 dwSrcSps)
{
INT32 CurrentPos;
INT16 *psSrc = (INT16 *)pSrc;
INT16 *psDst = (INT16 *)pDst;
INT16 sWorker;
// start at dwSpsSrc / 2, decrement by 8000
//
CurrentPos = (dwSrcSps >> 1);
while (dwSrcSamples--)
{
CurrentPos -= 8000;
if (CurrentPos >= 0)
psSrc += 2;
else
{
/* CR 82894, to avoid overflow, divide before add */
sWorker = ((*psSrc) >> 1 );
psSrc++;
sWorker += ((*psSrc) >> 1 );
psSrc++;
*psDst++ = sWorker;
CurrentPos += dwSrcSps;
}
}
return (psDst - (INT16 *)pDst);
}
/*******************************************************************************
**
** Function BTA_DmPcmInitSamples
**
** Description initialize the down sample converter.
**
** src_sps: original samples per second (source audio data)
** (ex. 44100, 48000)
** bits: number of bits per pcm sample (16)
** n_channels: number of channels (i.e. mono(1), stereo(2)...)
**
** Returns none
**
*******************************************************************************/
void BTA_DmPcmInitSamples (UINT32 src_sps, UINT32 bits, UINT32 n_channels)
{
tBTA_DM_PCM_RESAMPLE_CB *p_cb = &bta_dm_pcm_cb;
p_cb->cur_pos = src_sps / 2;
p_cb->src_sps = src_sps;
p_cb->bits = bits;
p_cb->n_channels = n_channels;
p_cb->sample_size = 2;
p_cb->divisor = 2;
memset(p_cb->overlap_area, 0, sizeof(p_cb->overlap_area) );
if ((src_sps == BTA_DM_PCM_SMPL_RATE_44100) ||
(src_sps == BTA_DM_PCM_SMPL_RATE_22050) ||
(src_sps == BTA_DM_PCM_SMPL_RATE_11025))
p_cb->can_be_filtered = 1;
else
p_cb->can_be_filtered = 0;
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG2("bta_dm_pcm_init_samples: n_channels = %d bits = %d", n_channels, bits);
#endif
if(n_channels == 1)
{
/* mono */
if(bits == 8)
{
p_cb->filter = (PCONVERT_TO_BT_FILTERED) Convert_8M_ToBT_Filtered;
p_cb->nofilter = (PCONVERT_TO_BT_NOFILTER) Convert_8M_ToBT_NoFilter;
p_cb->divisor = 1;
}
else
{
p_cb->filter = (PCONVERT_TO_BT_FILTERED) Convert_16M_ToBT_Filtered;
p_cb->nofilter = (PCONVERT_TO_BT_NOFILTER) Convert_16M_ToBT_NoFilter;
}
}
else
{
/* stereo */
if(bits == 8)
{
p_cb->filter = (PCONVERT_TO_BT_FILTERED) Convert_8S_ToBT_Filtered;
p_cb->nofilter = (PCONVERT_TO_BT_NOFILTER) Convert_8S_ToBT_NoFilter;
}
else
{
p_cb->filter = (PCONVERT_TO_BT_FILTERED) Convert_16S_ToBT_Filtered;
p_cb->nofilter = (PCONVERT_TO_BT_NOFILTER) Convert_16S_ToBT_NoFilter;
p_cb->divisor = 4;
}
}
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG2("bta_pcm_init_dwn_sample: cur_pos %d, src_sps %d", \
p_cb->cur_pos, p_cb->src_sps);
APPL_TRACE_DEBUG3("bta_pcm_init_dwn_sample: bits %d, n_channels %d, sample_size %d, ", \
p_cb->bits, p_cb->n_channels, p_cb->sample_size);
APPL_TRACE_DEBUG3("bta_pcm_init_dwn_sample: can_be_filtered %d, n_channels: %d, \
divisor %d", p_cb->can_be_filtered, p_cb->n_channels, p_cb->divisor);
#endif
}
/**************************************************************************************
** Function BTA_DmPcmResample
**
** Description Down sampling utility to convert higher sampling rate into 8K/16bits
** PCM samples.
**
** Parameters p_src: pointer to the buffer where the original sampling PCM
** are stored.
** in_bytes: Length of the input PCM sample buffer in byte.
** p_dst: pointer to the buffer which is to be used to store
** the converted PCM samples.
**
**
** Returns INT32: number of samples converted.
**
**************************************************************************************/
INT32 BTA_DmPcmResample (void *p_src, UINT32 in_bytes, void *p_dst)
{
UINT32 out_sample;
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG1("bta_pcm_resample : insamples %d", (in_bytes / bta_dm_pcm_cb.divisor));
#endif
if(bta_dm_pcm_cb.can_be_filtered)
{
out_sample = (*bta_dm_pcm_cb.filter) (p_src, p_dst, (in_bytes / bta_dm_pcm_cb.divisor),
bta_dm_pcm_cb.src_sps, (INT32 *) &bta_dm_pcm_cb.cur_pos, bta_dm_pcm_cb.overlap_area);
}
else
{
out_sample = (*bta_dm_pcm_cb.nofilter) (p_src, p_dst,
(in_bytes / bta_dm_pcm_cb.divisor), bta_dm_pcm_cb.src_sps);
}
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG1("bta_pcm_resample : outsamples %d", out_sample);
#endif
return (out_sample * bta_dm_pcm_cb.sample_size);
}
#endif
|
