forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathpcm_lib.c
2594 lines (2408 loc) · 70 KB
/
pcm_lib.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
/*
* Digital Audio (PCM) abstract layer
* Copyright (c) by Jaroslav Kysela <[email protected]>
* Abramo Bagnara <[email protected]>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/math64.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>
/*
* fill ring buffer with silence
* runtime->silence_start: starting pointer to silence area
* runtime->silence_filled: size filled with silence
* runtime->silence_threshold: threshold from application
* runtime->silence_size: maximal size from application
*
* when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
*/
void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t frames, ofs, transfer;
if (runtime->silence_size < runtime->boundary) {
snd_pcm_sframes_t noise_dist, n;
if (runtime->silence_start != runtime->control->appl_ptr) {
n = runtime->control->appl_ptr - runtime->silence_start;
if (n < 0)
n += runtime->boundary;
if ((snd_pcm_uframes_t)n < runtime->silence_filled)
runtime->silence_filled -= n;
else
runtime->silence_filled = 0;
runtime->silence_start = runtime->control->appl_ptr;
}
if (runtime->silence_filled >= runtime->buffer_size)
return;
noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
return;
frames = runtime->silence_threshold - noise_dist;
if (frames > runtime->silence_size)
frames = runtime->silence_size;
} else {
if (new_hw_ptr == ULONG_MAX) { /* initialization */
snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
if (avail > runtime->buffer_size)
avail = runtime->buffer_size;
runtime->silence_filled = avail > 0 ? avail : 0;
runtime->silence_start = (runtime->status->hw_ptr +
runtime->silence_filled) %
runtime->boundary;
} else {
ofs = runtime->status->hw_ptr;
frames = new_hw_ptr - ofs;
if ((snd_pcm_sframes_t)frames < 0)
frames += runtime->boundary;
runtime->silence_filled -= frames;
if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
runtime->silence_filled = 0;
runtime->silence_start = new_hw_ptr;
} else {
runtime->silence_start = ofs;
}
}
frames = runtime->buffer_size - runtime->silence_filled;
}
if (snd_BUG_ON(frames > runtime->buffer_size))
return;
if (frames == 0)
return;
ofs = runtime->silence_start % runtime->buffer_size;
while (frames > 0) {
transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
if (substream->ops->silence) {
int err;
err = substream->ops->silence(substream, -1, ofs, transfer);
snd_BUG_ON(err < 0);
} else {
char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
}
} else {
unsigned int c;
unsigned int channels = runtime->channels;
if (substream->ops->silence) {
for (c = 0; c < channels; ++c) {
int err;
err = substream->ops->silence(substream, c, ofs, transfer);
snd_BUG_ON(err < 0);
}
} else {
size_t dma_csize = runtime->dma_bytes / channels;
for (c = 0; c < channels; ++c) {
char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
}
}
}
runtime->silence_filled += transfer;
frames -= transfer;
ofs = 0;
}
}
#ifdef CONFIG_SND_DEBUG
void snd_pcm_debug_name(struct snd_pcm_substream *substream,
char *name, size_t len)
{
snprintf(name, len, "pcmC%dD%d%c:%d",
substream->pcm->card->number,
substream->pcm->device,
substream->stream ? 'c' : 'p',
substream->number);
}
EXPORT_SYMBOL(snd_pcm_debug_name);
#endif
#define XRUN_DEBUG_BASIC (1<<0)
#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
#define xrun_debug(substream, mask) \
((substream)->pstr->xrun_debug & (mask))
#else
#define xrun_debug(substream, mask) 0
#endif
#define dump_stack_on_xrun(substream) do { \
if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
dump_stack(); \
} while (0)
static void xrun(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
char name[16];
snd_pcm_debug_name(substream, name, sizeof(name));
snd_printd(KERN_DEBUG "XRUN: %s\n", name);
dump_stack_on_xrun(substream);
}
}
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
#define hw_ptr_error(substream, fmt, args...) \
do { \
if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
xrun_log_show(substream); \
if (snd_printd_ratelimit()) { \
snd_printd("PCM: " fmt, ##args); \
} \
dump_stack_on_xrun(substream); \
} \
} while (0)
#define XRUN_LOG_CNT 10
struct hwptr_log_entry {
unsigned int in_interrupt;
unsigned long jiffies;
snd_pcm_uframes_t pos;
snd_pcm_uframes_t period_size;
snd_pcm_uframes_t buffer_size;
snd_pcm_uframes_t old_hw_ptr;
snd_pcm_uframes_t hw_ptr_base;
};
struct snd_pcm_hwptr_log {
unsigned int idx;
unsigned int hit: 1;
struct hwptr_log_entry entries[XRUN_LOG_CNT];
};
static void xrun_log(struct snd_pcm_substream *substream,
snd_pcm_uframes_t pos, int in_interrupt)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
struct hwptr_log_entry *entry;
if (log == NULL) {
log = kzalloc(sizeof(*log), GFP_ATOMIC);
if (log == NULL)
return;
runtime->hwptr_log = log;
} else {
if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
return;
}
entry = &log->entries[log->idx];
entry->in_interrupt = in_interrupt;
entry->jiffies = jiffies;
entry->pos = pos;
entry->period_size = runtime->period_size;
entry->buffer_size = runtime->buffer_size;
entry->old_hw_ptr = runtime->status->hw_ptr;
entry->hw_ptr_base = runtime->hw_ptr_base;
log->idx = (log->idx + 1) % XRUN_LOG_CNT;
}
static void xrun_log_show(struct snd_pcm_substream *substream)
{
struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
struct hwptr_log_entry *entry;
char name[16];
unsigned int idx;
int cnt;
if (log == NULL)
return;
if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
return;
snd_pcm_debug_name(substream, name, sizeof(name));
for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
entry = &log->entries[idx];
if (entry->period_size == 0)
break;
snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
"hwptr=%ld/%ld\n",
name, entry->in_interrupt ? "[Q] " : "",
entry->jiffies,
(unsigned long)entry->pos,
(unsigned long)entry->period_size,
(unsigned long)entry->buffer_size,
(unsigned long)entry->old_hw_ptr,
(unsigned long)entry->hw_ptr_base);
idx++;
idx %= XRUN_LOG_CNT;
}
log->hit = 1;
}
#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
#define hw_ptr_error(substream, fmt, args...) do { } while (0)
#define xrun_log(substream, pos, in_interrupt) do { } while (0)
#define xrun_log_show(substream) do { } while (0)
#endif
int snd_pcm_update_state(struct snd_pcm_substream *substream,
struct snd_pcm_runtime *runtime)
{
snd_pcm_uframes_t avail;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
avail = snd_pcm_playback_avail(runtime);
else
avail = snd_pcm_capture_avail(runtime);
if (avail > runtime->avail_max)
runtime->avail_max = avail;
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
if (avail >= runtime->buffer_size) {
snd_pcm_drain_done(substream);
return -EPIPE;
}
} else {
if (avail >= runtime->stop_threshold) {
xrun(substream);
return -EPIPE;
}
}
if (runtime->twake) {
if (avail >= runtime->twake)
wake_up(&runtime->tsleep);
} else if (avail >= runtime->control->avail_min)
wake_up(&runtime->sleep);
return 0;
}
static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
unsigned int in_interrupt)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t pos;
snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
snd_pcm_sframes_t hdelta, delta;
unsigned long jdelta;
unsigned long curr_jiffies;
struct timespec curr_tstamp;
struct timespec audio_tstamp;
int crossed_boundary = 0;
old_hw_ptr = runtime->status->hw_ptr;
/*
* group pointer, time and jiffies reads to allow for more
* accurate correlations/corrections.
* The values are stored at the end of this routine after
* corrections for hw_ptr position
*/
pos = substream->ops->pointer(substream);
curr_jiffies = jiffies;
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&
(substream->ops->wall_clock))
substream->ops->wall_clock(substream, &audio_tstamp);
}
if (pos == SNDRV_PCM_POS_XRUN) {
xrun(substream);
return -EPIPE;
}
if (pos >= runtime->buffer_size) {
if (snd_printd_ratelimit()) {
char name[16];
snd_pcm_debug_name(substream, name, sizeof(name));
xrun_log_show(substream);
snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
"buffer size = %ld, period size = %ld\n",
name, pos, runtime->buffer_size,
runtime->period_size);
}
pos = 0;
}
pos -= pos % runtime->min_align;
if (xrun_debug(substream, XRUN_DEBUG_LOG))
xrun_log(substream, pos, in_interrupt);
hw_base = runtime->hw_ptr_base;
new_hw_ptr = hw_base + pos;
if (in_interrupt) {
/* we know that one period was processed */
/* delta = "expected next hw_ptr" for in_interrupt != 0 */
delta = runtime->hw_ptr_interrupt + runtime->period_size;
if (delta > new_hw_ptr) {
/* check for double acknowledged interrupts */
hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
hw_base += runtime->buffer_size;
if (hw_base >= runtime->boundary) {
hw_base = 0;
crossed_boundary++;
}
new_hw_ptr = hw_base + pos;
goto __delta;
}
}
}
/* new_hw_ptr might be lower than old_hw_ptr in case when */
/* pointer crosses the end of the ring buffer */
if (new_hw_ptr < old_hw_ptr) {
hw_base += runtime->buffer_size;
if (hw_base >= runtime->boundary) {
hw_base = 0;
crossed_boundary++;
}
new_hw_ptr = hw_base + pos;
}
__delta:
delta = new_hw_ptr - old_hw_ptr;
if (delta < 0)
delta += runtime->boundary;
if (xrun_debug(substream, in_interrupt ?
XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
char name[16];
snd_pcm_debug_name(substream, name, sizeof(name));
snd_printd("%s_update: %s: pos=%u/%u/%u, "
"hwptr=%ld/%ld/%ld/%ld\n",
in_interrupt ? "period" : "hwptr",
name,
(unsigned int)pos,
(unsigned int)runtime->period_size,
(unsigned int)runtime->buffer_size,
(unsigned long)delta,
(unsigned long)old_hw_ptr,
(unsigned long)new_hw_ptr,
(unsigned long)runtime->hw_ptr_base);
}
if (runtime->no_period_wakeup) {
snd_pcm_sframes_t xrun_threshold;
/*
* Without regular period interrupts, we have to check
* the elapsed time to detect xruns.
*/
jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
goto no_delta_check;
hdelta = jdelta - delta * HZ / runtime->rate;
xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
while (hdelta > xrun_threshold) {
delta += runtime->buffer_size;
hw_base += runtime->buffer_size;
if (hw_base >= runtime->boundary) {
hw_base = 0;
crossed_boundary++;
}
new_hw_ptr = hw_base + pos;
hdelta -= runtime->hw_ptr_buffer_jiffies;
}
goto no_delta_check;
}
/* something must be really wrong */
if (delta >= runtime->buffer_size + runtime->period_size) {
hw_ptr_error(substream,
"Unexpected hw_pointer value %s"
"(stream=%i, pos=%ld, new_hw_ptr=%ld, "
"old_hw_ptr=%ld)\n",
in_interrupt ? "[Q] " : "[P]",
substream->stream, (long)pos,
(long)new_hw_ptr, (long)old_hw_ptr);
return 0;
}
/* Do jiffies check only in xrun_debug mode */
if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
goto no_jiffies_check;
/* Skip the jiffies check for hardwares with BATCH flag.
* Such hardware usually just increases the position at each IRQ,
* thus it can't give any strange position.
*/
if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
goto no_jiffies_check;
hdelta = delta;
if (hdelta < runtime->delay)
goto no_jiffies_check;
hdelta -= runtime->delay;
jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
delta = jdelta /
(((runtime->period_size * HZ) / runtime->rate)
+ HZ/100);
/* move new_hw_ptr according jiffies not pos variable */
new_hw_ptr = old_hw_ptr;
hw_base = delta;
/* use loop to avoid checks for delta overflows */
/* the delta value is small or zero in most cases */
while (delta > 0) {
new_hw_ptr += runtime->period_size;
if (new_hw_ptr >= runtime->boundary) {
new_hw_ptr -= runtime->boundary;
crossed_boundary--;
}
delta--;
}
/* align hw_base to buffer_size */
hw_ptr_error(substream,
"hw_ptr skipping! %s"
"(pos=%ld, delta=%ld, period=%ld, "
"jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
in_interrupt ? "[Q] " : "",
(long)pos, (long)hdelta,
(long)runtime->period_size, jdelta,
((hdelta * HZ) / runtime->rate), hw_base,
(unsigned long)old_hw_ptr,
(unsigned long)new_hw_ptr);
/* reset values to proper state */
delta = 0;
hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
}
no_jiffies_check:
if (delta > runtime->period_size + runtime->period_size / 2) {
hw_ptr_error(substream,
"Lost interrupts? %s"
"(stream=%i, delta=%ld, new_hw_ptr=%ld, "
"old_hw_ptr=%ld)\n",
in_interrupt ? "[Q] " : "",
substream->stream, (long)delta,
(long)new_hw_ptr,
(long)old_hw_ptr);
}
no_delta_check:
if (runtime->status->hw_ptr == new_hw_ptr)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, new_hw_ptr);
if (in_interrupt) {
delta = new_hw_ptr - runtime->hw_ptr_interrupt;
if (delta < 0)
delta += runtime->boundary;
delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
runtime->hw_ptr_interrupt += delta;
if (runtime->hw_ptr_interrupt >= runtime->boundary)
runtime->hw_ptr_interrupt -= runtime->boundary;
}
runtime->hw_ptr_base = hw_base;
runtime->status->hw_ptr = new_hw_ptr;
runtime->hw_ptr_jiffies = curr_jiffies;
if (crossed_boundary) {
snd_BUG_ON(crossed_boundary != 1);
runtime->hw_ptr_wrap += runtime->boundary;
}
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
runtime->status->tstamp = curr_tstamp;
if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {
/*
* no wall clock available, provide audio timestamp
* derived from pointer position+delay
*/
u64 audio_frames, audio_nsecs;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
audio_frames = runtime->hw_ptr_wrap
+ runtime->status->hw_ptr
- runtime->delay;
else
audio_frames = runtime->hw_ptr_wrap
+ runtime->status->hw_ptr
+ runtime->delay;
audio_nsecs = div_u64(audio_frames * 1000000000LL,
runtime->rate);
audio_tstamp = ns_to_timespec(audio_nsecs);
}
runtime->status->audio_tstamp = audio_tstamp;
}
return snd_pcm_update_state(substream, runtime);
}
/* CAUTION: call it with irq disabled */
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
{
return snd_pcm_update_hw_ptr0(substream, 0);
}
/**
* snd_pcm_set_ops - set the PCM operators
* @pcm: the pcm instance
* @direction: stream direction, SNDRV_PCM_STREAM_XXX
* @ops: the operator table
*
* Sets the given PCM operators to the pcm instance.
*/
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
const struct snd_pcm_ops *ops)
{
struct snd_pcm_str *stream = &pcm->streams[direction];
struct snd_pcm_substream *substream;
for (substream = stream->substream; substream != NULL; substream = substream->next)
substream->ops = ops;
}
EXPORT_SYMBOL(snd_pcm_set_ops);
/**
* snd_pcm_sync - set the PCM sync id
* @substream: the pcm substream
*
* Sets the PCM sync identifier for the card.
*/
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->sync.id32[0] = substream->pcm->card->number;
runtime->sync.id32[1] = -1;
runtime->sync.id32[2] = -1;
runtime->sync.id32[3] = -1;
}
EXPORT_SYMBOL(snd_pcm_set_sync);
/*
* Standard ioctl routine
*/
static inline unsigned int div32(unsigned int a, unsigned int b,
unsigned int *r)
{
if (b == 0) {
*r = 0;
return UINT_MAX;
}
*r = a % b;
return a / b;
}
static inline unsigned int div_down(unsigned int a, unsigned int b)
{
if (b == 0)
return UINT_MAX;
return a / b;
}
static inline unsigned int div_up(unsigned int a, unsigned int b)
{
unsigned int r;
unsigned int q;
if (b == 0)
return UINT_MAX;
q = div32(a, b, &r);
if (r)
++q;
return q;
}
static inline unsigned int mul(unsigned int a, unsigned int b)
{
if (a == 0)
return 0;
if (div_down(UINT_MAX, a) < b)
return UINT_MAX;
return a * b;
}
static inline unsigned int muldiv32(unsigned int a, unsigned int b,
unsigned int c, unsigned int *r)
{
u_int64_t n = (u_int64_t) a * b;
if (c == 0) {
snd_BUG_ON(!n);
*r = 0;
return UINT_MAX;
}
n = div_u64_rem(n, c, r);
if (n >= UINT_MAX) {
*r = 0;
return UINT_MAX;
}
return n;
}
/**
* snd_interval_refine - refine the interval value of configurator
* @i: the interval value to refine
* @v: the interval value to refer to
*
* Refines the interval value with the reference value.
* The interval is changed to the range satisfying both intervals.
* The interval status (min, max, integer, etc.) are evaluated.
*
* Return: Positive if the value is changed, zero if it's not changed, or a
* negative error code.
*/
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
{
int changed = 0;
if (snd_BUG_ON(snd_interval_empty(i)))
return -EINVAL;
if (i->min < v->min) {
i->min = v->min;
i->openmin = v->openmin;
changed = 1;
} else if (i->min == v->min && !i->openmin && v->openmin) {
i->openmin = 1;
changed = 1;
}
if (i->max > v->max) {
i->max = v->max;
i->openmax = v->openmax;
changed = 1;
} else if (i->max == v->max && !i->openmax && v->openmax) {
i->openmax = 1;
changed = 1;
}
if (!i->integer && v->integer) {
i->integer = 1;
changed = 1;
}
if (i->integer) {
if (i->openmin) {
i->min++;
i->openmin = 0;
}
if (i->openmax) {
i->max--;
i->openmax = 0;
}
} else if (!i->openmin && !i->openmax && i->min == i->max)
i->integer = 1;
if (snd_interval_checkempty(i)) {
snd_interval_none(i);
return -EINVAL;
}
return changed;
}
EXPORT_SYMBOL(snd_interval_refine);
static int snd_interval_refine_first(struct snd_interval *i)
{
if (snd_BUG_ON(snd_interval_empty(i)))
return -EINVAL;
if (snd_interval_single(i))
return 0;
i->max = i->min;
i->openmax = i->openmin;
if (i->openmax)
i->max++;
return 1;
}
static int snd_interval_refine_last(struct snd_interval *i)
{
if (snd_BUG_ON(snd_interval_empty(i)))
return -EINVAL;
if (snd_interval_single(i))
return 0;
i->min = i->max;
i->openmin = i->openmax;
if (i->openmin)
i->min--;
return 1;
}
void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
{
if (a->empty || b->empty) {
snd_interval_none(c);
return;
}
c->empty = 0;
c->min = mul(a->min, b->min);
c->openmin = (a->openmin || b->openmin);
c->max = mul(a->max, b->max);
c->openmax = (a->openmax || b->openmax);
c->integer = (a->integer && b->integer);
}
/**
* snd_interval_div - refine the interval value with division
* @a: dividend
* @b: divisor
* @c: quotient
*
* c = a / b
*
* Returns non-zero if the value is changed, zero if not changed.
*/
void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
{
unsigned int r;
if (a->empty || b->empty) {
snd_interval_none(c);
return;
}
c->empty = 0;
c->min = div32(a->min, b->max, &r);
c->openmin = (r || a->openmin || b->openmax);
if (b->min > 0) {
c->max = div32(a->max, b->min, &r);
if (r) {
c->max++;
c->openmax = 1;
} else
c->openmax = (a->openmax || b->openmin);
} else {
c->max = UINT_MAX;
c->openmax = 0;
}
c->integer = 0;
}
/**
* snd_interval_muldivk - refine the interval value
* @a: dividend 1
* @b: dividend 2
* @k: divisor (as integer)
* @c: result
*
* c = a * b / k
*
* Returns non-zero if the value is changed, zero if not changed.
*/
void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
unsigned int k, struct snd_interval *c)
{
unsigned int r;
if (a->empty || b->empty) {
snd_interval_none(c);
return;
}
c->empty = 0;
c->min = muldiv32(a->min, b->min, k, &r);
c->openmin = (r || a->openmin || b->openmin);
c->max = muldiv32(a->max, b->max, k, &r);
if (r) {
c->max++;
c->openmax = 1;
} else
c->openmax = (a->openmax || b->openmax);
c->integer = 0;
}
/**
* snd_interval_mulkdiv - refine the interval value
* @a: dividend 1
* @k: dividend 2 (as integer)
* @b: divisor
* @c: result
*
* c = a * k / b
*
* Returns non-zero if the value is changed, zero if not changed.
*/
void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
const struct snd_interval *b, struct snd_interval *c)
{
unsigned int r;
if (a->empty || b->empty) {
snd_interval_none(c);
return;
}
c->empty = 0;
c->min = muldiv32(a->min, k, b->max, &r);
c->openmin = (r || a->openmin || b->openmax);
if (b->min > 0) {
c->max = muldiv32(a->max, k, b->min, &r);
if (r) {
c->max++;
c->openmax = 1;
} else
c->openmax = (a->openmax || b->openmin);
} else {
c->max = UINT_MAX;
c->openmax = 0;
}
c->integer = 0;
}
/* ---- */
/**
* snd_interval_ratnum - refine the interval value
* @i: interval to refine
* @rats_count: number of ratnum_t
* @rats: ratnum_t array
* @nump: pointer to store the resultant numerator
* @denp: pointer to store the resultant denominator
*
* Return: Positive if the value is changed, zero if it's not changed, or a
* negative error code.
*/
int snd_interval_ratnum(struct snd_interval *i,
unsigned int rats_count, struct snd_ratnum *rats,
unsigned int *nump, unsigned int *denp)
{
unsigned int best_num, best_den;
int best_diff;
unsigned int k;
struct snd_interval t;
int err;
unsigned int result_num, result_den;
int result_diff;
best_num = best_den = best_diff = 0;
for (k = 0; k < rats_count; ++k) {
unsigned int num = rats[k].num;
unsigned int den;
unsigned int q = i->min;
int diff;
if (q == 0)
q = 1;
den = div_up(num, q);
if (den < rats[k].den_min)
continue;
if (den > rats[k].den_max)
den = rats[k].den_max;
else {
unsigned int r;
r = (den - rats[k].den_min) % rats[k].den_step;
if (r != 0)
den -= r;
}
diff = num - q * den;
if (diff < 0)
diff = -diff;
if (best_num == 0 ||
diff * best_den < best_diff * den) {
best_diff = diff;
best_den = den;
best_num = num;
}
}
if (best_den == 0) {
i->empty = 1;
return -EINVAL;
}
t.min = div_down(best_num, best_den);
t.openmin = !!(best_num % best_den);
result_num = best_num;
result_diff = best_diff;
result_den = best_den;
best_num = best_den = best_diff = 0;
for (k = 0; k < rats_count; ++k) {
unsigned int num = rats[k].num;
unsigned int den;
unsigned int q = i->max;
int diff;
if (q == 0) {
i->empty = 1;
return -EINVAL;
}
den = div_down(num, q);
if (den > rats[k].den_max)
continue;
if (den < rats[k].den_min)
den = rats[k].den_min;
else {
unsigned int r;
r = (den - rats[k].den_min) % rats[k].den_step;
if (r != 0)
den += rats[k].den_step - r;
}
diff = q * den - num;
if (diff < 0)
diff = -diff;
if (best_num == 0 ||
diff * best_den < best_diff * den) {
best_diff = diff;
best_den = den;
best_num = num;
}
}
if (best_den == 0) {
i->empty = 1;
return -EINVAL;
}
t.max = div_up(best_num, best_den);
t.openmax = !!(best_num % best_den);
t.integer = 0;
err = snd_interval_refine(i, &t);
if (err < 0)
return err;
if (snd_interval_single(i)) {
if (best_diff * result_den < result_diff * best_den) {
result_num = best_num;
result_den = best_den;
}
if (nump)
*nump = result_num;
if (denp)
*denp = result_den;
}
return err;
}
EXPORT_SYMBOL(snd_interval_ratnum);
/**
* snd_interval_ratden - refine the interval value
* @i: interval to refine
* @rats_count: number of struct ratden
* @rats: struct ratden array
* @nump: pointer to store the resultant numerator
* @denp: pointer to store the resultant denominator
*
* Return: Positive if the value is changed, zero if it's not changed, or a
* negative error code.
*/
static int snd_interval_ratden(struct snd_interval *i,
unsigned int rats_count, struct snd_ratden *rats,
unsigned int *nump, unsigned int *denp)
{
unsigned int best_num, best_diff, best_den;
unsigned int k;
struct snd_interval t;
int err;