-
Notifications
You must be signed in to change notification settings - Fork 0
/
pcm.c
1384 lines (1173 loc) · 39 KB
/
pcm.c
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
/* pcm.c
**
** Copyright 2011, The Android Open Source Project
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** * Neither the name of The Android Open Source Project nor the names of
** its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
** DAMAGE.
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <limits.h>
#include <linux/ioctl.h>
#define __force
#define __bitwise
#define __user
#include <sound/asound.h>
#include <tinyalsa/asoundlib.h>
#include "pcm_io.h"
#include "snd_utils.h"
enum {
PCM_NODE_TYPE_HW = 0,
PCM_NODE_TYPE_PLUGIN,
};
#define PARAM_MAX SNDRV_PCM_HW_PARAM_LAST_INTERVAL
/* Logs information into a string; follows snprintf() in that
* offset may be greater than size, and though no characters are copied
* into string, characters are still counted into offset. */
#define STRLOG(string, offset, size, ...) \
do { int temp, clipoffset = offset > size ? size : offset; \
temp = snprintf(string + clipoffset, size - clipoffset, __VA_ARGS__); \
if (temp > 0) offset += temp; } while (0)
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#endif
/* refer to SNDRV_PCM_ACCESS_##index in sound/asound.h. */
static const char * const access_lookup[] = {
"MMAP_INTERLEAVED",
"MMAP_NONINTERLEAVED",
"MMAP_COMPLEX",
"RW_INTERLEAVED",
"RW_NONINTERLEAVED",
};
/* refer to SNDRV_PCM_FORMAT_##index in sound/asound.h. */
static const char * const format_lookup[] = {
/*[0] =*/ "S8",
"U8",
"S16_LE",
"S16_BE",
"U16_LE",
"U16_BE",
"S24_LE",
"S24_BE",
"U24_LE",
"U24_BE",
"S32_LE",
"S32_BE",
"U32_LE",
"U32_BE",
"FLOAT_LE",
"FLOAT_BE",
"FLOAT64_LE",
"FLOAT64_BE",
"IEC958_SUBFRAME_LE",
"IEC958_SUBFRAME_BE",
"MU_LAW",
"A_LAW",
"IMA_ADPCM",
"MPEG",
/*[24] =*/ "GSM",
/* gap */
[31] = "SPECIAL",
"S24_3LE",
"S24_3BE",
"U24_3LE",
"U24_3BE",
"S20_3LE",
"S20_3BE",
"U20_3LE",
"U20_3BE",
"S18_3LE",
"S18_3BE",
"U18_3LE",
/*[43] =*/ "U18_3BE",
#if 0
/* recent additions, may not be present on local asound.h */
"G723_24",
"G723_24_1B",
"G723_40",
"G723_40_1B",
"DSD_U8",
"DSD_U16_LE",
#endif
};
extern struct pcm_ops hw_ops;
extern struct pcm_ops plug_ops;
/* refer to SNDRV_PCM_SUBFORMAT_##index in sound/asound.h. */
static const char * const subformat_lookup[] = {
"STD",
};
static inline int param_is_mask(int p)
{
return (p >= SNDRV_PCM_HW_PARAM_FIRST_MASK) &&
(p <= SNDRV_PCM_HW_PARAM_LAST_MASK);
}
static inline int param_is_interval(int p)
{
return (p >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL) &&
(p <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL);
}
static inline struct snd_interval *param_to_interval(struct snd_pcm_hw_params *p, int n)
{
return &(p->intervals[n - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]);
}
static inline struct snd_mask *param_to_mask(struct snd_pcm_hw_params *p, int n)
{
return &(p->masks[n - SNDRV_PCM_HW_PARAM_FIRST_MASK]);
}
static void param_set_mask(struct snd_pcm_hw_params *p, int n, unsigned int bit)
{
if (bit >= SNDRV_MASK_MAX)
return;
if (param_is_mask(n)) {
struct snd_mask *m = param_to_mask(p, n);
m->bits[0] = 0;
m->bits[1] = 0;
m->bits[bit >> 5] |= (1 << (bit & 31));
}
}
static void param_set_min(struct snd_pcm_hw_params *p, int n, unsigned int val)
{
if (param_is_interval(n)) {
struct snd_interval *i = param_to_interval(p, n);
i->min = val;
}
}
static unsigned int param_get_min(struct snd_pcm_hw_params *p, int n)
{
if (param_is_interval(n)) {
struct snd_interval *i = param_to_interval(p, n);
return i->min;
}
return 0;
}
static void param_set_max(struct snd_pcm_hw_params *p, int n, unsigned int val)
{
if (param_is_interval(n)) {
struct snd_interval *i = param_to_interval(p, n);
i->max = val;
}
}
static unsigned int param_get_max(struct snd_pcm_hw_params *p, int n)
{
if (param_is_interval(n)) {
struct snd_interval *i = param_to_interval(p, n);
return i->max;
}
return 0;
}
static void param_set_int(struct snd_pcm_hw_params *p, int n, unsigned int val)
{
if (param_is_interval(n)) {
struct snd_interval *i = param_to_interval(p, n);
i->min = val;
i->max = val;
i->integer = 1;
}
}
static unsigned int param_get_int(struct snd_pcm_hw_params *p, int n)
{
if (param_is_interval(n)) {
struct snd_interval *i = param_to_interval(p, n);
if (i->integer)
return i->max;
}
return 0;
}
static void param_init(struct snd_pcm_hw_params *p)
{
int n;
memset(p, 0, sizeof(*p));
for (n = SNDRV_PCM_HW_PARAM_FIRST_MASK;
n <= SNDRV_PCM_HW_PARAM_LAST_MASK; n++) {
struct snd_mask *m = param_to_mask(p, n);
m->bits[0] = ~0;
m->bits[1] = ~0;
}
for (n = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL;
n <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; n++) {
struct snd_interval *i = param_to_interval(p, n);
i->min = 0;
i->max = ~0;
}
p->rmask = ~0U;
p->cmask = 0;
p->info = ~0U;
}
#define PCM_ERROR_MAX 128
struct pcm {
int fd;
unsigned int flags;
bool running:1;
bool prepared:1;
int underruns;
unsigned int buffer_size;
unsigned long boundary;
char error[PCM_ERROR_MAX];
struct pcm_config config;
struct snd_pcm_mmap_status *mmap_status;
struct snd_pcm_mmap_control *mmap_control;
struct snd_pcm_sync_ptr *sync_ptr;
void *mmap_buffer;
unsigned int noirq_frames_per_msec;
int wait_for_avail_min;
unsigned int subdevice;
struct pcm_ops *ops;
void *data;
void *snd_node;
};
unsigned int pcm_get_buffer_size(struct pcm *pcm)
{
return pcm->buffer_size;
}
const char* pcm_get_error(struct pcm *pcm)
{
return pcm->error;
}
unsigned int pcm_get_subdevice(struct pcm *pcm)
{
return pcm->subdevice;
}
static int oops(struct pcm *pcm, int e, const char *fmt, ...)
{
va_list ap;
int sz;
va_start(ap, fmt);
vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap);
va_end(ap);
sz = strlen(pcm->error);
if (e)
snprintf(pcm->error + sz, PCM_ERROR_MAX - sz,
": %s", strerror(e));
return -1;
}
static unsigned int pcm_format_to_alsa(enum pcm_format format)
{
switch (format) {
case PCM_FORMAT_S32_LE:
return SNDRV_PCM_FORMAT_S32_LE;
case PCM_FORMAT_S8:
return SNDRV_PCM_FORMAT_S8;
case PCM_FORMAT_S24_3LE:
return SNDRV_PCM_FORMAT_S24_3LE;
case PCM_FORMAT_S24_LE:
return SNDRV_PCM_FORMAT_S24_LE;
default:
case PCM_FORMAT_S16_LE:
return SNDRV_PCM_FORMAT_S16_LE;
};
}
unsigned int pcm_format_to_bits(enum pcm_format format)
{
switch (format) {
case PCM_FORMAT_S32_LE:
case PCM_FORMAT_S24_LE:
return 32;
case PCM_FORMAT_S24_3LE:
return 24;
default:
case PCM_FORMAT_S16_LE:
return 16;
};
}
unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes)
{
return bytes / (pcm->config.channels *
(pcm_format_to_bits(pcm->config.format) >> 3));
}
unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames)
{
return frames * pcm->config.channels *
(pcm_format_to_bits(pcm->config.format) >> 3);
}
static int pcm_sync_ptr(struct pcm *pcm, int flags) {
if (pcm->sync_ptr) {
pcm->sync_ptr->flags = flags;
if (pcm->ops->ioctl(pcm->data, SNDRV_PCM_IOCTL_SYNC_PTR,
pcm->sync_ptr) < 0)
return -1;
}
return 0;
}
static int pcm_hw_mmap_status(struct pcm *pcm) {
if (pcm->sync_ptr)
return 0;
int page_size = sysconf(_SC_PAGE_SIZE);
pcm->mmap_status = pcm->ops->mmap(pcm->data, NULL, page_size, PROT_READ, MAP_FILE | MAP_SHARED,
SNDRV_PCM_MMAP_OFFSET_STATUS);
if (pcm->mmap_status == MAP_FAILED)
pcm->mmap_status = NULL;
if (!pcm->mmap_status)
goto mmap_error;
pcm->mmap_control = pcm->ops->mmap(pcm->data, NULL, page_size, PROT_READ | PROT_WRITE,
MAP_FILE | MAP_SHARED, SNDRV_PCM_MMAP_OFFSET_CONTROL);
if (pcm->mmap_control == MAP_FAILED)
pcm->mmap_control = NULL;
if (!pcm->mmap_control) {
pcm->ops->munmap(pcm->data, pcm->mmap_status, page_size);
pcm->mmap_status = NULL;
goto mmap_error;
}
if (pcm->flags & PCM_MMAP)
pcm->mmap_control->avail_min = pcm->config.avail_min;
else
pcm->mmap_control->avail_min = 1;
return 0;
mmap_error:
pcm->sync_ptr = calloc(1, sizeof(*pcm->sync_ptr));
if (!pcm->sync_ptr)
return -ENOMEM;
pcm->mmap_status = &pcm->sync_ptr->s.status;
pcm->mmap_control = &pcm->sync_ptr->c.control;
if (pcm->flags & PCM_MMAP)
pcm->mmap_control->avail_min = pcm->config.avail_min;
else
pcm->mmap_control->avail_min = 1;
pcm_sync_ptr(pcm, 0);
return 0;
}
static void pcm_hw_munmap_status(struct pcm *pcm) {
if (pcm->sync_ptr) {
free(pcm->sync_ptr);
pcm->sync_ptr = NULL;
} else {
int page_size = sysconf(_SC_PAGE_SIZE);
if (pcm->mmap_status)
pcm->ops->munmap(pcm->data, pcm->mmap_status, page_size);
if (pcm->mmap_control)
pcm->ops->munmap(pcm->data, pcm->mmap_control, page_size);
}
pcm->mmap_status = NULL;
pcm->mmap_control = NULL;
}
static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset,
char *buf, unsigned int src_offset,
unsigned int frames)
{
int size_bytes = pcm_frames_to_bytes(pcm, frames);
int pcm_offset_bytes = pcm_frames_to_bytes(pcm, pcm_offset);
int src_offset_bytes = pcm_frames_to_bytes(pcm, src_offset);
/* interleaved only atm */
if (pcm->flags & PCM_IN)
memcpy(buf + src_offset_bytes,
(char*)pcm->mmap_buffer + pcm_offset_bytes,
size_bytes);
else
memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes,
buf + src_offset_bytes,
size_bytes);
return 0;
}
static int pcm_mmap_transfer_areas(struct pcm *pcm, char *buf,
unsigned int offset, unsigned int size)
{
void *pcm_areas;
int commit;
unsigned int pcm_offset, frames, count = 0;
while (size > 0) {
frames = size;
pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames);
pcm_areas_copy(pcm, pcm_offset, buf, offset, frames);
commit = pcm_mmap_commit(pcm, pcm_offset, frames);
if (commit < 0) {
oops(pcm, errno, "failed to commit %d frames\n", frames);
return commit;
}
offset += commit;
count += commit;
size -= commit;
}
return count;
}
int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
struct timespec *tstamp)
{
snd_pcm_sframes_t frames;
int rc;
snd_pcm_uframes_t hw_ptr;
if (!pcm_is_ready(pcm))
return -1;
rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_APPL|SNDRV_PCM_SYNC_PTR_HWSYNC);
if (rc < 0)
return -1;
if ((pcm->mmap_status->state != PCM_STATE_RUNNING) &&
(pcm->mmap_status->state != PCM_STATE_DRAINING))
return -1;
*tstamp = pcm->mmap_status->tstamp;
if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
return -1;
hw_ptr = pcm->mmap_status->hw_ptr;
if (pcm->flags & PCM_IN)
frames = hw_ptr - pcm->mmap_control->appl_ptr;
else
frames = hw_ptr + (snd_pcm_uframes_t) pcm->buffer_size -
pcm->mmap_control->appl_ptr;
if (frames < 0)
frames += pcm->boundary;
else if (frames >= (snd_pcm_sframes_t) pcm->boundary)
frames -= pcm->boundary;
*avail = (unsigned int)frames;
return 0;
}
int pcm_mmap_get_hw_ptr(struct pcm* pcm, unsigned int *hw_ptr, struct timespec *tstamp)
{
int frames;
int rc;
if (pcm == NULL || hw_ptr == NULL || tstamp == NULL)
return oops(pcm, EINVAL, "pcm %p, hw_ptr %p, tstamp %p", pcm, hw_ptr, tstamp);
if (!pcm_is_ready(pcm))
return oops(pcm, errno, "pcm_is_ready failed");
rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC);
if (rc < 0)
return oops(pcm, errno, "pcm_sync_ptr failed");
if (pcm->mmap_status == NULL)
return oops(pcm, EINVAL, "pcm %p, mmap_status is NULL", pcm);
if ((pcm->mmap_status->state != PCM_STATE_RUNNING) &&
(pcm->mmap_status->state != PCM_STATE_DRAINING))
return oops(pcm, ENOSYS, "invalid stream state %d", pcm->mmap_status->state);
*tstamp = pcm->mmap_status->tstamp;
if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
return oops(pcm, errno, "invalid time stamp");
*hw_ptr = pcm->mmap_status->hw_ptr;
return 0;
}
int pcm_write(struct pcm *pcm, const void *data, unsigned int count)
{
struct snd_xferi x;
if (pcm->flags & PCM_IN)
return -EINVAL;
x.buf = (void*)data;
x.frames = count / (pcm->config.channels *
pcm_format_to_bits(pcm->config.format) / 8);
for (;;) {
if (!pcm->running) {
int prepare_error = pcm_prepare(pcm);
if (prepare_error)
return prepare_error;
if (pcm->ops->ioctl(pcm->data, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x))
return oops(pcm, errno, "cannot write initial data");
pcm->running = true;
return 0;
}
if (pcm->ops->ioctl(pcm->data, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) {
pcm->prepared = false;
pcm->running = false;
if (errno == EPIPE) {
/* we failed to make our window -- try to restart if we are
* allowed to do so. Otherwise, simply allow the EPIPE error to
* propagate up to the app level */
pcm->underruns++;
if (pcm->flags & PCM_NORESTART)
return -EPIPE;
continue;
}
return oops(pcm, errno, "cannot write stream data");
}
return 0;
}
}
int pcm_read(struct pcm *pcm, void *data, unsigned int count)
{
struct snd_xferi x;
if (!(pcm->flags & PCM_IN))
return -EINVAL;
x.buf = data;
x.frames = count / (pcm->config.channels *
pcm_format_to_bits(pcm->config.format) / 8);
for (;;) {
if (!pcm->running) {
if (pcm_start(pcm) < 0) {
fprintf(stderr, "start error");
return -errno;
}
}
if (pcm->ops->ioctl(pcm->data, SNDRV_PCM_IOCTL_READI_FRAMES, &x)) {
pcm->prepared = false;
pcm->running = false;
if (errno == EPIPE) {
/* we failed to make our window -- try to restart */
pcm->underruns++;
continue;
}
return oops(pcm, errno, "cannot read stream data");
}
return 0;
}
}
static struct pcm bad_pcm = {
.fd = -1,
};
struct pcm_params *pcm_params_get(unsigned int card, unsigned int device,
unsigned int flags)
{
struct snd_pcm_hw_params *params;
enum snd_node_type pcm_type;
struct pcm_ops *ops;
void *snd_node, *data;
int fd;
snd_node = snd_utils_get_dev_node(card, device, NODE_PCM);
pcm_type = snd_utils_get_node_type(snd_node);
if (pcm_type == SND_NODE_TYPE_PLUGIN)
ops = &plug_ops;
else
ops = &hw_ops;
fd = ops->open(card, device, flags, &data, snd_node);
if (fd < 0) {
fprintf(stderr, "cannot open device %u for card %u\n",
device, card);
goto err_open;
}
params = calloc(1, sizeof(struct snd_pcm_hw_params));
if (!params)
goto err_calloc;
param_init(params);
if (ops->ioctl(data, SNDRV_PCM_IOCTL_HW_REFINE, params)) {
fprintf(stderr, "SNDRV_PCM_IOCTL_HW_REFINE error (%d)\n", errno);
goto err_hw_refine;
}
snd_utils_put_dev_node(snd_node);
ops->close(data);
return (struct pcm_params *)params;
err_hw_refine:
free(params);
err_calloc:
ops->close(data);
err_open:
snd_utils_put_dev_node(snd_node);
return NULL;
}
void pcm_params_free(struct pcm_params *pcm_params)
{
struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
if (params)
free(params);
}
static int pcm_param_to_alsa(enum pcm_param param)
{
switch (param) {
case PCM_PARAM_ACCESS:
return SNDRV_PCM_HW_PARAM_ACCESS;
case PCM_PARAM_FORMAT:
return SNDRV_PCM_HW_PARAM_FORMAT;
case PCM_PARAM_SUBFORMAT:
return SNDRV_PCM_HW_PARAM_SUBFORMAT;
case PCM_PARAM_SAMPLE_BITS:
return SNDRV_PCM_HW_PARAM_SAMPLE_BITS;
break;
case PCM_PARAM_FRAME_BITS:
return SNDRV_PCM_HW_PARAM_FRAME_BITS;
break;
case PCM_PARAM_CHANNELS:
return SNDRV_PCM_HW_PARAM_CHANNELS;
break;
case PCM_PARAM_RATE:
return SNDRV_PCM_HW_PARAM_RATE;
break;
case PCM_PARAM_PERIOD_TIME:
return SNDRV_PCM_HW_PARAM_PERIOD_TIME;
break;
case PCM_PARAM_PERIOD_SIZE:
return SNDRV_PCM_HW_PARAM_PERIOD_SIZE;
break;
case PCM_PARAM_PERIOD_BYTES:
return SNDRV_PCM_HW_PARAM_PERIOD_BYTES;
break;
case PCM_PARAM_PERIODS:
return SNDRV_PCM_HW_PARAM_PERIODS;
break;
case PCM_PARAM_BUFFER_TIME:
return SNDRV_PCM_HW_PARAM_BUFFER_TIME;
break;
case PCM_PARAM_BUFFER_SIZE:
return SNDRV_PCM_HW_PARAM_BUFFER_SIZE;
break;
case PCM_PARAM_BUFFER_BYTES:
return SNDRV_PCM_HW_PARAM_BUFFER_BYTES;
break;
case PCM_PARAM_TICK_TIME:
return SNDRV_PCM_HW_PARAM_TICK_TIME;
break;
default:
return -1;
}
}
struct pcm_mask *pcm_params_get_mask(const struct pcm_params *pcm_params,
enum pcm_param param)
{
int p;
struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
if (params == NULL) {
return NULL;
}
p = pcm_param_to_alsa(param);
if (p < 0 || !param_is_mask(p)) {
return NULL;
}
return (struct pcm_mask *)param_to_mask(params, p);
}
unsigned int pcm_params_get_min(const struct pcm_params *pcm_params,
enum pcm_param param)
{
struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
int p;
if (!params)
return 0;
p = pcm_param_to_alsa(param);
if (p < 0)
return 0;
return param_get_min(params, p);
}
void pcm_params_set_min(struct pcm_params *pcm_params,
enum pcm_param param, unsigned int val)
{
struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
int p;
if (!params)
return;
p = pcm_param_to_alsa(param);
if (p < 0)
return;
param_set_min(params, p, val);
}
unsigned int pcm_params_get_max(const struct pcm_params *pcm_params,
enum pcm_param param)
{
struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
int p;
if (!params)
return 0;
p = pcm_param_to_alsa(param);
if (p < 0)
return 0;
return param_get_max(params, p);
}
void pcm_params_set_max(struct pcm_params *pcm_params,
enum pcm_param param, unsigned int val)
{
struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
int p;
if (!params)
return;
p = pcm_param_to_alsa(param);
if (p < 0)
return;
param_set_max(params, p, val);
}
static int pcm_mask_test(struct pcm_mask *m, unsigned int index)
{
const unsigned int bitshift = 5; /* for 32 bit integer */
const unsigned int bitmask = (1 << bitshift) - 1;
unsigned int element;
element = index >> bitshift;
if (element >= ARRAY_SIZE(m->bits))
return 0; /* for safety, but should never occur */
return (m->bits[element] >> (index & bitmask)) & 1;
}
static int pcm_mask_to_string(struct pcm_mask *m, char *string, unsigned int size,
char *mask_name,
const char * const *bit_array_name, size_t bit_array_size)
{
unsigned int i;
unsigned int offset = 0;
if (m == NULL)
return 0;
if (bit_array_size < 32) {
STRLOG(string, offset, size, "%12s:\t%#08x\n", mask_name, m->bits[0]);
} else { /* spans two or more bitfields, print with an array index */
for (i = 0; i < (bit_array_size + 31) >> 5; ++i) {
STRLOG(string, offset, size, "%9s[%d]:\t%#08x\n",
mask_name, i, m->bits[i]);
}
}
for (i = 0; i < bit_array_size; ++i) {
if (pcm_mask_test(m, i)) {
STRLOG(string, offset, size, "%12s \t%s\n", "", bit_array_name[i]);
}
}
return offset;
}
int pcm_params_to_string(struct pcm_params *params, char *string, unsigned int size)
{
struct pcm_mask *m;
unsigned int min, max;
unsigned int clipoffset, offset;
m = pcm_params_get_mask(params, PCM_PARAM_ACCESS);
offset = pcm_mask_to_string(m, string, size,
"Access", access_lookup, ARRAY_SIZE(access_lookup));
m = pcm_params_get_mask(params, PCM_PARAM_FORMAT);
clipoffset = offset > size ? size : offset;
offset += pcm_mask_to_string(m, string + clipoffset, size - clipoffset,
"Format", format_lookup, ARRAY_SIZE(format_lookup));
m = pcm_params_get_mask(params, PCM_PARAM_SUBFORMAT);
clipoffset = offset > size ? size : offset;
offset += pcm_mask_to_string(m, string + clipoffset, size - clipoffset,
"Subformat", subformat_lookup, ARRAY_SIZE(subformat_lookup));
min = pcm_params_get_min(params, PCM_PARAM_RATE);
max = pcm_params_get_max(params, PCM_PARAM_RATE);
STRLOG(string, offset, size, " Rate:\tmin=%uHz\tmax=%uHz\n", min, max);
min = pcm_params_get_min(params, PCM_PARAM_CHANNELS);
max = pcm_params_get_max(params, PCM_PARAM_CHANNELS);
STRLOG(string, offset, size, " Channels:\tmin=%u\t\tmax=%u\n", min, max);
min = pcm_params_get_min(params, PCM_PARAM_SAMPLE_BITS);
max = pcm_params_get_max(params, PCM_PARAM_SAMPLE_BITS);
STRLOG(string, offset, size, " Sample bits:\tmin=%u\t\tmax=%u\n", min, max);
min = pcm_params_get_min(params, PCM_PARAM_PERIOD_SIZE);
max = pcm_params_get_max(params, PCM_PARAM_PERIOD_SIZE);
STRLOG(string, offset, size, " Period size:\tmin=%u\t\tmax=%u\n", min, max);
min = pcm_params_get_min(params, PCM_PARAM_PERIODS);
max = pcm_params_get_max(params, PCM_PARAM_PERIODS);
STRLOG(string, offset, size, "Period count:\tmin=%u\t\tmax=%u\n", min, max);
return offset;
}
int pcm_params_format_test(struct pcm_params *params, enum pcm_format format)
{
unsigned int alsa_format = pcm_format_to_alsa(format);
if (alsa_format == SNDRV_PCM_FORMAT_S16_LE && format != PCM_FORMAT_S16_LE)
return 0; /* caution: format not recognized is equivalent to S16_LE */
return pcm_mask_test(pcm_params_get_mask(params, PCM_PARAM_FORMAT), alsa_format);
}
int pcm_close(struct pcm *pcm)
{
if (pcm == &bad_pcm)
return 0;
pcm_hw_munmap_status(pcm);
if (pcm->flags & PCM_MMAP) {
pcm_stop(pcm);
pcm->ops->munmap(pcm->data, pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
}
if (pcm->data)
pcm->ops->close(pcm->data);
if (pcm->snd_node)
snd_utils_put_dev_node(pcm->snd_node);
pcm->prepared = false;
pcm->running = false;
pcm->buffer_size = 0;
pcm->fd = -1;
free(pcm);
return 0;
}
struct pcm *pcm_open(unsigned int card, unsigned int device,
unsigned int flags, struct pcm_config *config)
{
struct pcm *pcm;
struct snd_pcm_info info;
struct snd_pcm_hw_params params;
struct snd_pcm_sw_params sparams;
int rc, pcm_type;
if (!config) {
return &bad_pcm; /* TODO: could support default config here */
}
pcm = calloc(1, sizeof(struct pcm));
if (!pcm) {
oops(&bad_pcm, ENOMEM, "can't allocate PCM object");
return &bad_pcm; /* TODO: could support default config here */
}
pcm->config = *config;
pcm->flags = flags;
pcm->snd_node = snd_utils_get_dev_node(card, device, NODE_PCM);
pcm_type = snd_utils_get_node_type(pcm->snd_node);
if (pcm_type == SND_NODE_TYPE_PLUGIN)
pcm->ops = &plug_ops;
else
pcm->ops = &hw_ops;
pcm->fd = pcm->ops->open(card, device, flags, &pcm->data, pcm->snd_node);
if (pcm->fd < 0) {
oops(&bad_pcm, errno, "cannot open device %u for card %u",
device, card);
goto fail_open;
}
if (pcm->ops->ioctl(pcm->data, SNDRV_PCM_IOCTL_INFO, &info)) {
oops(&bad_pcm, errno, "cannot get info");
goto fail_close;
}
pcm->subdevice = info.subdevice;
param_init(¶ms);
param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT,
pcm_format_to_alsa(config->format));
param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_SUBFORMAT,
SNDRV_PCM_SUBFORMAT_STD);
param_set_min(¶ms, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
param_set_int(¶ms, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
pcm_format_to_bits(config->format));
param_set_int(¶ms, SNDRV_PCM_HW_PARAM_FRAME_BITS,
pcm_format_to_bits(config->format) * config->channels);
param_set_int(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS,
config->channels);
param_set_int(¶ms, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
param_set_int(¶ms, SNDRV_PCM_HW_PARAM_RATE, config->rate);
if (flags & PCM_NOIRQ) {
if (!(flags & PCM_MMAP)) {
oops(&bad_pcm, EINVAL, "noirq only currently supported with mmap().");
goto fail_close;
}
params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
pcm->noirq_frames_per_msec = config->rate / 1000;
}
if (flags & PCM_MMAP)
param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
else
param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_ACCESS_RW_INTERLEAVED);
if (pcm->ops->ioctl(pcm->data, SNDRV_PCM_IOCTL_HW_PARAMS, ¶ms)) {
oops(&bad_pcm, errno, "cannot set hw params");
goto fail_close;
}
/* get our refined hw_params */
config->period_size = param_get_int(¶ms, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
config->period_count = param_get_int(¶ms, SNDRV_PCM_HW_PARAM_PERIODS);
pcm->buffer_size = config->period_count * config->period_size;
if (flags & PCM_MMAP) {
pcm->mmap_buffer = pcm->ops->mmap(pcm->data, NULL,
pcm_frames_to_bytes(pcm, pcm->buffer_size),
PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, 0);
if (pcm->mmap_buffer == MAP_FAILED) {
oops(&bad_pcm, errno, "failed to mmap buffer %d bytes\n",
pcm_frames_to_bytes(pcm, pcm->buffer_size));
goto fail_close;
}
}
memset(&sparams, 0, sizeof(sparams));
sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
sparams.period_step = 1;