1 /* pcm.c
2 **
3 ** Copyright 2011, The Android Open Source Project
4 **
5 ** Redistribution and use in source and binary forms, with or without
6 ** modification, are permitted provided that the following conditions are met:
7 ** * Redistributions of source code must retain the above copyright
8 ** notice, this list of conditions and the following disclaimer.
9 ** * Redistributions in binary form must reproduce the above copyright
10 ** notice, this list of conditions and the following disclaimer in the
11 ** documentation and/or other materials provided with the distribution.
12 ** * Neither the name of The Android Open Source Project nor the names of
13 ** its contributors may be used to endorse or promote products derived
14 ** from this software without specific prior written permission.
15 **
16 ** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
17 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 ** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
20 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 ** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
26 ** DAMAGE.
27 */
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <fcntl.h>
32 #include <stdarg.h>
33 #include <string.h>
34 #include <errno.h>
35 #include <unistd.h>
36 #include <poll.h>
37
38 #include <sys/ioctl.h>
39 #include <sys/mman.h>
40 #include <sys/time.h>
41 #include <limits.h>
42
43 #include <linux/ioctl.h>
44 #define __force
45 #define __bitwise
46 #define __user
47 #include <sound/asound.h>
48
49 #include <tinyalsa/asoundlib.h>
50
51 #define PARAM_MAX SNDRV_PCM_HW_PARAM_LAST_INTERVAL
52 #define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2)
53
54 /* Logs information into a string; follows snprintf() in that
55 * offset may be greater than size, and though no characters are copied
56 * into string, characters are still counted into offset. */
57 #define STRLOG(string, offset, size, ...) \
58 do { int temp, clipoffset = offset > size ? size : offset; \
59 temp = snprintf(string + clipoffset, size - clipoffset, __VA_ARGS__); \
60 if (temp > 0) offset += temp; } while (0)
61
62 #ifndef ARRAY_SIZE
63 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
64 #endif
65
66 /* refer to SNDRV_PCM_ACCESS_##index in sound/asound.h. */
67 static const char * const access_lookup[] = {
68 "MMAP_INTERLEAVED",
69 "MMAP_NONINTERLEAVED",
70 "MMAP_COMPLEX",
71 "RW_INTERLEAVED",
72 "RW_NONINTERLEAVED",
73 };
74
75 /* refer to SNDRV_PCM_FORMAT_##index in sound/asound.h. */
76 static const char * const format_lookup[] = {
77 /*[0] =*/ "S8",
78 "U8",
79 "S16_LE",
80 "S16_BE",
81 "U16_LE",
82 "U16_BE",
83 "S24_LE",
84 "S24_BE",
85 "U24_LE",
86 "U24_BE",
87 "S32_LE",
88 "S32_BE",
89 "U32_LE",
90 "U32_BE",
91 "FLOAT_LE",
92 "FLOAT_BE",
93 "FLOAT64_LE",
94 "FLOAT64_BE",
95 "IEC958_SUBFRAME_LE",
96 "IEC958_SUBFRAME_BE",
97 "MU_LAW",
98 "A_LAW",
99 "IMA_ADPCM",
100 "MPEG",
101 /*[24] =*/ "GSM",
102 /* gap */
103 [31] = "SPECIAL",
104 "S24_3LE",
105 "S24_3BE",
106 "U24_3LE",
107 "U24_3BE",
108 "S20_3LE",
109 "S20_3BE",
110 "U20_3LE",
111 "U20_3BE",
112 "S18_3LE",
113 "S18_3BE",
114 "U18_3LE",
115 /*[43] =*/ "U18_3BE",
116 #if 0
117 /* recent additions, may not be present on local asound.h */
118 "G723_24",
119 "G723_24_1B",
120 "G723_40",
121 "G723_40_1B",
122 "DSD_U8",
123 "DSD_U16_LE",
124 #endif
125 };
126
127 /* refer to SNDRV_PCM_SUBFORMAT_##index in sound/asound.h. */
128 static const char * const subformat_lookup[] = {
129 "STD",
130 };
131
param_is_mask(int p)132 static inline int param_is_mask(int p)
133 {
134 return (p >= SNDRV_PCM_HW_PARAM_FIRST_MASK) &&
135 (p <= SNDRV_PCM_HW_PARAM_LAST_MASK);
136 }
137
param_is_interval(int p)138 static inline int param_is_interval(int p)
139 {
140 return (p >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL) &&
141 (p <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL);
142 }
143
param_to_interval(struct snd_pcm_hw_params * p,int n)144 static inline struct snd_interval *param_to_interval(struct snd_pcm_hw_params *p, int n)
145 {
146 return &(p->intervals[n - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]);
147 }
148
param_to_mask(struct snd_pcm_hw_params * p,int n)149 static inline struct snd_mask *param_to_mask(struct snd_pcm_hw_params *p, int n)
150 {
151 return &(p->masks[n - SNDRV_PCM_HW_PARAM_FIRST_MASK]);
152 }
153
param_set_mask(struct snd_pcm_hw_params * p,int n,unsigned int bit)154 static void param_set_mask(struct snd_pcm_hw_params *p, int n, unsigned int bit)
155 {
156 if (bit >= SNDRV_MASK_MAX)
157 return;
158 if (param_is_mask(n)) {
159 struct snd_mask *m = param_to_mask(p, n);
160 m->bits[0] = 0;
161 m->bits[1] = 0;
162 m->bits[bit >> 5] |= (1 << (bit & 31));
163 }
164 }
165
param_set_min(struct snd_pcm_hw_params * p,int n,unsigned int val)166 static void param_set_min(struct snd_pcm_hw_params *p, int n, unsigned int val)
167 {
168 if (param_is_interval(n)) {
169 struct snd_interval *i = param_to_interval(p, n);
170 i->min = val;
171 }
172 }
173
param_get_min(struct snd_pcm_hw_params * p,int n)174 static unsigned int param_get_min(struct snd_pcm_hw_params *p, int n)
175 {
176 if (param_is_interval(n)) {
177 struct snd_interval *i = param_to_interval(p, n);
178 return i->min;
179 }
180 return 0;
181 }
182
param_set_max(struct snd_pcm_hw_params * p,int n,unsigned int val)183 static void param_set_max(struct snd_pcm_hw_params *p, int n, unsigned int val)
184 {
185 if (param_is_interval(n)) {
186 struct snd_interval *i = param_to_interval(p, n);
187 i->max = val;
188 }
189 }
190
param_get_max(struct snd_pcm_hw_params * p,int n)191 static unsigned int param_get_max(struct snd_pcm_hw_params *p, int n)
192 {
193 if (param_is_interval(n)) {
194 struct snd_interval *i = param_to_interval(p, n);
195 return i->max;
196 }
197 return 0;
198 }
199
param_set_int(struct snd_pcm_hw_params * p,int n,unsigned int val)200 static void param_set_int(struct snd_pcm_hw_params *p, int n, unsigned int val)
201 {
202 if (param_is_interval(n)) {
203 struct snd_interval *i = param_to_interval(p, n);
204 i->min = val;
205 i->max = val;
206 i->integer = 1;
207 }
208 }
209
param_get_int(struct snd_pcm_hw_params * p,int n)210 static unsigned int param_get_int(struct snd_pcm_hw_params *p, int n)
211 {
212 if (param_is_interval(n)) {
213 struct snd_interval *i = param_to_interval(p, n);
214 if (i->integer)
215 return i->max;
216 }
217 return 0;
218 }
219
param_init(struct snd_pcm_hw_params * p)220 static void param_init(struct snd_pcm_hw_params *p)
221 {
222 int n;
223
224 memset(p, 0, sizeof(*p));
225 for (n = SNDRV_PCM_HW_PARAM_FIRST_MASK;
226 n <= SNDRV_PCM_HW_PARAM_LAST_MASK; n++) {
227 struct snd_mask *m = param_to_mask(p, n);
228 m->bits[0] = ~0;
229 m->bits[1] = ~0;
230 }
231 for (n = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL;
232 n <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; n++) {
233 struct snd_interval *i = param_to_interval(p, n);
234 i->min = 0;
235 i->max = ~0;
236 }
237 p->rmask = ~0U;
238 p->cmask = 0;
239 p->info = ~0U;
240 }
241
242 #define PCM_ERROR_MAX 128
243
244 struct pcm {
245 int fd;
246 unsigned int flags;
247 int running:1;
248 int prepared:1;
249 int underruns;
250 unsigned int buffer_size;
251 unsigned int boundary;
252 char error[PCM_ERROR_MAX];
253 struct pcm_config config;
254 struct snd_pcm_mmap_status *mmap_status;
255 struct snd_pcm_mmap_control *mmap_control;
256 struct snd_pcm_sync_ptr *sync_ptr;
257 void *mmap_buffer;
258 unsigned int noirq_frames_per_msec;
259 int wait_for_avail_min;
260 };
261
pcm_get_buffer_size(struct pcm * pcm)262 unsigned int pcm_get_buffer_size(struct pcm *pcm)
263 {
264 return pcm->buffer_size;
265 }
266
pcm_get_error(struct pcm * pcm)267 const char* pcm_get_error(struct pcm *pcm)
268 {
269 return pcm->error;
270 }
271
oops(struct pcm * pcm,int e,const char * fmt,...)272 static int oops(struct pcm *pcm, int e, const char *fmt, ...)
273 {
274 va_list ap;
275 int sz;
276
277 va_start(ap, fmt);
278 vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap);
279 va_end(ap);
280 sz = strlen(pcm->error);
281
282 if (errno)
283 snprintf(pcm->error + sz, PCM_ERROR_MAX - sz,
284 ": %s", strerror(e));
285 return -1;
286 }
287
pcm_format_to_alsa(enum pcm_format format)288 static unsigned int pcm_format_to_alsa(enum pcm_format format)
289 {
290 switch (format) {
291 case PCM_FORMAT_S32_LE:
292 return SNDRV_PCM_FORMAT_S32_LE;
293 case PCM_FORMAT_S8:
294 return SNDRV_PCM_FORMAT_S8;
295 case PCM_FORMAT_S24_3LE:
296 return SNDRV_PCM_FORMAT_S24_3LE;
297 case PCM_FORMAT_S24_LE:
298 return SNDRV_PCM_FORMAT_S24_LE;
299 default:
300 case PCM_FORMAT_S16_LE:
301 return SNDRV_PCM_FORMAT_S16_LE;
302 };
303 }
304
pcm_format_to_bits(enum pcm_format format)305 unsigned int pcm_format_to_bits(enum pcm_format format)
306 {
307 switch (format) {
308 case PCM_FORMAT_S32_LE:
309 case PCM_FORMAT_S24_LE:
310 return 32;
311 case PCM_FORMAT_S24_3LE:
312 return 24;
313 default:
314 case PCM_FORMAT_S16_LE:
315 return 16;
316 };
317 }
318
pcm_bytes_to_frames(struct pcm * pcm,unsigned int bytes)319 unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes)
320 {
321 return bytes / (pcm->config.channels *
322 (pcm_format_to_bits(pcm->config.format) >> 3));
323 }
324
pcm_frames_to_bytes(struct pcm * pcm,unsigned int frames)325 unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames)
326 {
327 return frames * pcm->config.channels *
328 (pcm_format_to_bits(pcm->config.format) >> 3);
329 }
330
pcm_sync_ptr(struct pcm * pcm,int flags)331 static int pcm_sync_ptr(struct pcm *pcm, int flags) {
332 if (pcm->sync_ptr) {
333 pcm->sync_ptr->flags = flags;
334 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SYNC_PTR, pcm->sync_ptr) < 0)
335 return -1;
336 }
337 return 0;
338 }
339
pcm_hw_mmap_status(struct pcm * pcm)340 static int pcm_hw_mmap_status(struct pcm *pcm) {
341
342 if (pcm->sync_ptr)
343 return 0;
344
345 int page_size = sysconf(_SC_PAGE_SIZE);
346 pcm->mmap_status = mmap(NULL, page_size, PROT_READ, MAP_FILE | MAP_SHARED,
347 pcm->fd, SNDRV_PCM_MMAP_OFFSET_STATUS);
348 if (pcm->mmap_status == MAP_FAILED)
349 pcm->mmap_status = NULL;
350 if (!pcm->mmap_status)
351 goto mmap_error;
352
353 pcm->mmap_control = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
354 MAP_FILE | MAP_SHARED, pcm->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL);
355 if (pcm->mmap_control == MAP_FAILED)
356 pcm->mmap_control = NULL;
357 if (!pcm->mmap_control) {
358 munmap(pcm->mmap_status, page_size);
359 pcm->mmap_status = NULL;
360 goto mmap_error;
361 }
362 if (pcm->flags & PCM_MMAP)
363 pcm->mmap_control->avail_min = pcm->config.avail_min;
364 else
365 pcm->mmap_control->avail_min = 1;
366
367 return 0;
368
369 mmap_error:
370
371 pcm->sync_ptr = calloc(1, sizeof(*pcm->sync_ptr));
372 if (!pcm->sync_ptr)
373 return -ENOMEM;
374 pcm->mmap_status = &pcm->sync_ptr->s.status;
375 pcm->mmap_control = &pcm->sync_ptr->c.control;
376 if (pcm->flags & PCM_MMAP)
377 pcm->mmap_control->avail_min = pcm->config.avail_min;
378 else
379 pcm->mmap_control->avail_min = 1;
380
381 pcm_sync_ptr(pcm, 0);
382
383 return 0;
384 }
385
pcm_hw_munmap_status(struct pcm * pcm)386 static void pcm_hw_munmap_status(struct pcm *pcm) {
387 if (pcm->sync_ptr) {
388 free(pcm->sync_ptr);
389 pcm->sync_ptr = NULL;
390 } else {
391 int page_size = sysconf(_SC_PAGE_SIZE);
392 if (pcm->mmap_status)
393 munmap(pcm->mmap_status, page_size);
394 if (pcm->mmap_control)
395 munmap(pcm->mmap_control, page_size);
396 }
397 pcm->mmap_status = NULL;
398 pcm->mmap_control = NULL;
399 }
400
pcm_areas_copy(struct pcm * pcm,unsigned int pcm_offset,char * buf,unsigned int src_offset,unsigned int frames)401 static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset,
402 char *buf, unsigned int src_offset,
403 unsigned int frames)
404 {
405 int size_bytes = pcm_frames_to_bytes(pcm, frames);
406 int pcm_offset_bytes = pcm_frames_to_bytes(pcm, pcm_offset);
407 int src_offset_bytes = pcm_frames_to_bytes(pcm, src_offset);
408
409 /* interleaved only atm */
410 if (pcm->flags & PCM_IN)
411 memcpy(buf + src_offset_bytes,
412 (char*)pcm->mmap_buffer + pcm_offset_bytes,
413 size_bytes);
414 else
415 memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes,
416 buf + src_offset_bytes,
417 size_bytes);
418 return 0;
419 }
420
pcm_mmap_transfer_areas(struct pcm * pcm,char * buf,unsigned int offset,unsigned int size)421 static int pcm_mmap_transfer_areas(struct pcm *pcm, char *buf,
422 unsigned int offset, unsigned int size)
423 {
424 void *pcm_areas;
425 int commit;
426 unsigned int pcm_offset, frames, count = 0;
427
428 while (size > 0) {
429 frames = size;
430 pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames);
431 pcm_areas_copy(pcm, pcm_offset, buf, offset, frames);
432 commit = pcm_mmap_commit(pcm, pcm_offset, frames);
433 if (commit < 0) {
434 oops(pcm, commit, "failed to commit %d frames\n", frames);
435 return commit;
436 }
437
438 offset += commit;
439 count += commit;
440 size -= commit;
441 }
442 return count;
443 }
444
pcm_get_htimestamp(struct pcm * pcm,unsigned int * avail,struct timespec * tstamp)445 int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
446 struct timespec *tstamp)
447 {
448 int frames;
449 int rc;
450 snd_pcm_uframes_t hw_ptr;
451
452 if (!pcm_is_ready(pcm))
453 return -1;
454
455 rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_APPL|SNDRV_PCM_SYNC_PTR_HWSYNC);
456 if (rc < 0)
457 return -1;
458
459 if ((pcm->mmap_status->state != PCM_STATE_RUNNING) &&
460 (pcm->mmap_status->state != PCM_STATE_DRAINING))
461 return -1;
462
463 *tstamp = pcm->mmap_status->tstamp;
464 if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
465 return -1;
466
467 hw_ptr = pcm->mmap_status->hw_ptr;
468 if (pcm->flags & PCM_IN)
469 frames = hw_ptr - pcm->mmap_control->appl_ptr;
470 else
471 frames = hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
472
473 if (frames < 0)
474 frames += pcm->boundary;
475 else if (frames > (int)pcm->boundary)
476 frames -= pcm->boundary;
477
478 *avail = (unsigned int)frames;
479
480 return 0;
481 }
482
pcm_write(struct pcm * pcm,const void * data,unsigned int count)483 int pcm_write(struct pcm *pcm, const void *data, unsigned int count)
484 {
485 struct snd_xferi x;
486
487 if (pcm->flags & PCM_IN)
488 return -EINVAL;
489
490 x.buf = (void*)data;
491 x.frames = count / (pcm->config.channels *
492 pcm_format_to_bits(pcm->config.format) / 8);
493
494 for (;;) {
495 if (!pcm->running) {
496 int prepare_error = pcm_prepare(pcm);
497 if (prepare_error)
498 return prepare_error;
499 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x))
500 return oops(pcm, errno, "cannot write initial data");
501 pcm->running = 1;
502 return 0;
503 }
504 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) {
505 pcm->prepared = 0;
506 pcm->running = 0;
507 if (errno == EPIPE) {
508 /* we failed to make our window -- try to restart if we are
509 * allowed to do so. Otherwise, simply allow the EPIPE error to
510 * propagate up to the app level */
511 pcm->underruns++;
512 if (pcm->flags & PCM_NORESTART)
513 return -EPIPE;
514 continue;
515 }
516 return oops(pcm, errno, "cannot write stream data");
517 }
518 return 0;
519 }
520 }
521
pcm_read(struct pcm * pcm,void * data,unsigned int count)522 int pcm_read(struct pcm *pcm, void *data, unsigned int count)
523 {
524 struct snd_xferi x;
525
526 if (!(pcm->flags & PCM_IN))
527 return -EINVAL;
528
529 x.buf = data;
530 x.frames = count / (pcm->config.channels *
531 pcm_format_to_bits(pcm->config.format) / 8);
532
533 for (;;) {
534 if (!pcm->running) {
535 if (pcm_start(pcm) < 0) {
536 fprintf(stderr, "start error");
537 return -errno;
538 }
539 }
540 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_READI_FRAMES, &x)) {
541 pcm->prepared = 0;
542 pcm->running = 0;
543 if (errno == EPIPE) {
544 /* we failed to make our window -- try to restart */
545 pcm->underruns++;
546 continue;
547 }
548 return oops(pcm, errno, "cannot read stream data");
549 }
550 return 0;
551 }
552 }
553
554 static struct pcm bad_pcm = {
555 .fd = -1,
556 };
557
pcm_params_get(unsigned int card,unsigned int device,unsigned int flags)558 struct pcm_params *pcm_params_get(unsigned int card, unsigned int device,
559 unsigned int flags)
560 {
561 struct snd_pcm_hw_params *params;
562 char fn[256];
563 int fd;
564
565 snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
566 flags & PCM_IN ? 'c' : 'p');
567
568 fd = open(fn, O_RDWR);
569 if (fd < 0) {
570 fprintf(stderr, "cannot open device '%s'\n", fn);
571 goto err_open;
572 }
573
574 params = calloc(1, sizeof(struct snd_pcm_hw_params));
575 if (!params)
576 goto err_calloc;
577
578 param_init(params);
579 if (ioctl(fd, SNDRV_PCM_IOCTL_HW_REFINE, params)) {
580 fprintf(stderr, "SNDRV_PCM_IOCTL_HW_REFINE error (%d)\n", errno);
581 goto err_hw_refine;
582 }
583
584 close(fd);
585
586 return (struct pcm_params *)params;
587
588 err_hw_refine:
589 free(params);
590 err_calloc:
591 close(fd);
592 err_open:
593 return NULL;
594 }
595
pcm_params_free(struct pcm_params * pcm_params)596 void pcm_params_free(struct pcm_params *pcm_params)
597 {
598 struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
599
600 if (params)
601 free(params);
602 }
603
pcm_param_to_alsa(enum pcm_param param)604 static int pcm_param_to_alsa(enum pcm_param param)
605 {
606 switch (param) {
607 case PCM_PARAM_ACCESS:
608 return SNDRV_PCM_HW_PARAM_ACCESS;
609 case PCM_PARAM_FORMAT:
610 return SNDRV_PCM_HW_PARAM_FORMAT;
611 case PCM_PARAM_SUBFORMAT:
612 return SNDRV_PCM_HW_PARAM_SUBFORMAT;
613 case PCM_PARAM_SAMPLE_BITS:
614 return SNDRV_PCM_HW_PARAM_SAMPLE_BITS;
615 break;
616 case PCM_PARAM_FRAME_BITS:
617 return SNDRV_PCM_HW_PARAM_FRAME_BITS;
618 break;
619 case PCM_PARAM_CHANNELS:
620 return SNDRV_PCM_HW_PARAM_CHANNELS;
621 break;
622 case PCM_PARAM_RATE:
623 return SNDRV_PCM_HW_PARAM_RATE;
624 break;
625 case PCM_PARAM_PERIOD_TIME:
626 return SNDRV_PCM_HW_PARAM_PERIOD_TIME;
627 break;
628 case PCM_PARAM_PERIOD_SIZE:
629 return SNDRV_PCM_HW_PARAM_PERIOD_SIZE;
630 break;
631 case PCM_PARAM_PERIOD_BYTES:
632 return SNDRV_PCM_HW_PARAM_PERIOD_BYTES;
633 break;
634 case PCM_PARAM_PERIODS:
635 return SNDRV_PCM_HW_PARAM_PERIODS;
636 break;
637 case PCM_PARAM_BUFFER_TIME:
638 return SNDRV_PCM_HW_PARAM_BUFFER_TIME;
639 break;
640 case PCM_PARAM_BUFFER_SIZE:
641 return SNDRV_PCM_HW_PARAM_BUFFER_SIZE;
642 break;
643 case PCM_PARAM_BUFFER_BYTES:
644 return SNDRV_PCM_HW_PARAM_BUFFER_BYTES;
645 break;
646 case PCM_PARAM_TICK_TIME:
647 return SNDRV_PCM_HW_PARAM_TICK_TIME;
648 break;
649
650 default:
651 return -1;
652 }
653 }
654
pcm_params_get_mask(struct pcm_params * pcm_params,enum pcm_param param)655 struct pcm_mask *pcm_params_get_mask(struct pcm_params *pcm_params,
656 enum pcm_param param)
657 {
658 int p;
659 struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
660 if (params == NULL) {
661 return NULL;
662 }
663
664 p = pcm_param_to_alsa(param);
665 if (p < 0 || !param_is_mask(p)) {
666 return NULL;
667 }
668
669 return (struct pcm_mask *)param_to_mask(params, p);
670 }
671
pcm_params_get_min(struct pcm_params * pcm_params,enum pcm_param param)672 unsigned int pcm_params_get_min(struct pcm_params *pcm_params,
673 enum pcm_param param)
674 {
675 struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
676 int p;
677
678 if (!params)
679 return 0;
680
681 p = pcm_param_to_alsa(param);
682 if (p < 0)
683 return 0;
684
685 return param_get_min(params, p);
686 }
687
pcm_params_set_min(struct pcm_params * pcm_params,enum pcm_param param,unsigned int val)688 void pcm_params_set_min(struct pcm_params *pcm_params,
689 enum pcm_param param, unsigned int val)
690 {
691 struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
692 int p;
693
694 if (!params)
695 return;
696
697 p = pcm_param_to_alsa(param);
698 if (p < 0)
699 return;
700
701 param_set_min(params, p, val);
702 }
703
pcm_params_get_max(struct pcm_params * pcm_params,enum pcm_param param)704 unsigned int pcm_params_get_max(struct pcm_params *pcm_params,
705 enum pcm_param param)
706 {
707 struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
708 int p;
709
710 if (!params)
711 return 0;
712
713 p = pcm_param_to_alsa(param);
714 if (p < 0)
715 return 0;
716
717 return param_get_max(params, p);
718 }
719
pcm_params_set_max(struct pcm_params * pcm_params,enum pcm_param param,unsigned int val)720 void pcm_params_set_max(struct pcm_params *pcm_params,
721 enum pcm_param param, unsigned int val)
722 {
723 struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
724 int p;
725
726 if (!params)
727 return;
728
729 p = pcm_param_to_alsa(param);
730 if (p < 0)
731 return;
732
733 param_set_max(params, p, val);
734 }
735
pcm_mask_test(struct pcm_mask * m,unsigned int index)736 static int pcm_mask_test(struct pcm_mask *m, unsigned int index)
737 {
738 const unsigned int bitshift = 5; /* for 32 bit integer */
739 const unsigned int bitmask = (1 << bitshift) - 1;
740 unsigned int element;
741
742 element = index >> bitshift;
743 if (element >= ARRAY_SIZE(m->bits))
744 return 0; /* for safety, but should never occur */
745 return (m->bits[element] >> (index & bitmask)) & 1;
746 }
747
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)748 static int pcm_mask_to_string(struct pcm_mask *m, char *string, unsigned int size,
749 char *mask_name,
750 const char * const *bit_array_name, size_t bit_array_size)
751 {
752 unsigned int i;
753 unsigned int offset = 0;
754
755 if (m == NULL)
756 return 0;
757 if (bit_array_size < 32) {
758 STRLOG(string, offset, size, "%12s:\t%#08x\n", mask_name, m->bits[0]);
759 } else { /* spans two or more bitfields, print with an array index */
760 for (i = 0; i < (bit_array_size + 31) >> 5; ++i) {
761 STRLOG(string, offset, size, "%9s[%d]:\t%#08x\n",
762 mask_name, i, m->bits[i]);
763 }
764 }
765 for (i = 0; i < bit_array_size; ++i) {
766 if (pcm_mask_test(m, i)) {
767 STRLOG(string, offset, size, "%12s \t%s\n", "", bit_array_name[i]);
768 }
769 }
770 return offset;
771 }
772
pcm_params_to_string(struct pcm_params * params,char * string,unsigned int size)773 int pcm_params_to_string(struct pcm_params *params, char *string, unsigned int size)
774 {
775 struct pcm_mask *m;
776 unsigned int min, max;
777 unsigned int clipoffset, offset;
778
779 m = pcm_params_get_mask(params, PCM_PARAM_ACCESS);
780 offset = pcm_mask_to_string(m, string, size,
781 "Access", access_lookup, ARRAY_SIZE(access_lookup));
782 m = pcm_params_get_mask(params, PCM_PARAM_FORMAT);
783 clipoffset = offset > size ? size : offset;
784 offset += pcm_mask_to_string(m, string + clipoffset, size - clipoffset,
785 "Format", format_lookup, ARRAY_SIZE(format_lookup));
786 m = pcm_params_get_mask(params, PCM_PARAM_SUBFORMAT);
787 clipoffset = offset > size ? size : offset;
788 offset += pcm_mask_to_string(m, string + clipoffset, size - clipoffset,
789 "Subformat", subformat_lookup, ARRAY_SIZE(subformat_lookup));
790 min = pcm_params_get_min(params, PCM_PARAM_RATE);
791 max = pcm_params_get_max(params, PCM_PARAM_RATE);
792 STRLOG(string, offset, size, " Rate:\tmin=%uHz\tmax=%uHz\n", min, max);
793 min = pcm_params_get_min(params, PCM_PARAM_CHANNELS);
794 max = pcm_params_get_max(params, PCM_PARAM_CHANNELS);
795 STRLOG(string, offset, size, " Channels:\tmin=%u\t\tmax=%u\n", min, max);
796 min = pcm_params_get_min(params, PCM_PARAM_SAMPLE_BITS);
797 max = pcm_params_get_max(params, PCM_PARAM_SAMPLE_BITS);
798 STRLOG(string, offset, size, " Sample bits:\tmin=%u\t\tmax=%u\n", min, max);
799 min = pcm_params_get_min(params, PCM_PARAM_PERIOD_SIZE);
800 max = pcm_params_get_max(params, PCM_PARAM_PERIOD_SIZE);
801 STRLOG(string, offset, size, " Period size:\tmin=%u\t\tmax=%u\n", min, max);
802 min = pcm_params_get_min(params, PCM_PARAM_PERIODS);
803 max = pcm_params_get_max(params, PCM_PARAM_PERIODS);
804 STRLOG(string, offset, size, "Period count:\tmin=%u\t\tmax=%u\n", min, max);
805 return offset;
806 }
807
pcm_params_format_test(struct pcm_params * params,enum pcm_format format)808 int pcm_params_format_test(struct pcm_params *params, enum pcm_format format)
809 {
810 unsigned int alsa_format = pcm_format_to_alsa(format);
811
812 if (alsa_format == SNDRV_PCM_FORMAT_S16_LE && format != PCM_FORMAT_S16_LE)
813 return 0; /* caution: format not recognized is equivalent to S16_LE */
814 return pcm_mask_test(pcm_params_get_mask(params, PCM_PARAM_FORMAT), alsa_format);
815 }
816
pcm_close(struct pcm * pcm)817 int pcm_close(struct pcm *pcm)
818 {
819 if (pcm == &bad_pcm)
820 return 0;
821
822 pcm_hw_munmap_status(pcm);
823
824 if (pcm->flags & PCM_MMAP) {
825 pcm_stop(pcm);
826 munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
827 }
828
829 if (pcm->fd >= 0)
830 close(pcm->fd);
831 pcm->prepared = 0;
832 pcm->running = 0;
833 pcm->buffer_size = 0;
834 pcm->fd = -1;
835 free(pcm);
836 return 0;
837 }
838
pcm_open(unsigned int card,unsigned int device,unsigned int flags,struct pcm_config * config)839 struct pcm *pcm_open(unsigned int card, unsigned int device,
840 unsigned int flags, struct pcm_config *config)
841 {
842 struct pcm *pcm;
843 struct snd_pcm_info info;
844 struct snd_pcm_hw_params params;
845 struct snd_pcm_sw_params sparams;
846 char fn[256];
847 int rc;
848
849 pcm = calloc(1, sizeof(struct pcm));
850 if (!pcm || !config)
851 return &bad_pcm; /* TODO: could support default config here */
852
853 pcm->config = *config;
854
855 snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
856 flags & PCM_IN ? 'c' : 'p');
857
858 pcm->flags = flags;
859 pcm->fd = open(fn, O_RDWR);
860 if (pcm->fd < 0) {
861 oops(pcm, errno, "cannot open device '%s'", fn);
862 return pcm;
863 }
864
865 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_INFO, &info)) {
866 oops(pcm, errno, "cannot get info");
867 goto fail_close;
868 }
869
870 param_init(¶ms);
871 param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT,
872 pcm_format_to_alsa(config->format));
873 param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_SUBFORMAT,
874 SNDRV_PCM_SUBFORMAT_STD);
875 param_set_min(¶ms, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
876 param_set_int(¶ms, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
877 pcm_format_to_bits(config->format));
878 param_set_int(¶ms, SNDRV_PCM_HW_PARAM_FRAME_BITS,
879 pcm_format_to_bits(config->format) * config->channels);
880 param_set_int(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS,
881 config->channels);
882 param_set_int(¶ms, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
883 param_set_int(¶ms, SNDRV_PCM_HW_PARAM_RATE, config->rate);
884
885 if (flags & PCM_NOIRQ) {
886 if (!(flags & PCM_MMAP)) {
887 oops(pcm, -EINVAL, "noirq only currently supported with mmap().");
888 goto fail;
889 }
890
891 params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
892 pcm->noirq_frames_per_msec = config->rate / 1000;
893 }
894
895 if (flags & PCM_MMAP)
896 param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_ACCESS,
897 SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
898 else
899 param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_ACCESS,
900 SNDRV_PCM_ACCESS_RW_INTERLEAVED);
901
902 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, ¶ms)) {
903 oops(pcm, errno, "cannot set hw params");
904 goto fail_close;
905 }
906
907 /* get our refined hw_params */
908 config->period_size = param_get_int(¶ms, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
909 config->period_count = param_get_int(¶ms, SNDRV_PCM_HW_PARAM_PERIODS);
910 pcm->buffer_size = config->period_count * config->period_size;
911
912 if (flags & PCM_MMAP) {
913 pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size),
914 PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0);
915 if (pcm->mmap_buffer == MAP_FAILED) {
916 oops(pcm, -errno, "failed to mmap buffer %d bytes\n",
917 pcm_frames_to_bytes(pcm, pcm->buffer_size));
918 goto fail_close;
919 }
920 }
921
922 memset(&sparams, 0, sizeof(sparams));
923 sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
924 sparams.period_step = 1;
925
926 if (!config->start_threshold) {
927 if (pcm->flags & PCM_IN)
928 pcm->config.start_threshold = sparams.start_threshold = 1;
929 else
930 pcm->config.start_threshold = sparams.start_threshold =
931 config->period_count * config->period_size / 2;
932 } else
933 sparams.start_threshold = config->start_threshold;
934
935 /* pick a high stop threshold - todo: does this need further tuning */
936 if (!config->stop_threshold) {
937 if (pcm->flags & PCM_IN)
938 pcm->config.stop_threshold = sparams.stop_threshold =
939 config->period_count * config->period_size * 10;
940 else
941 pcm->config.stop_threshold = sparams.stop_threshold =
942 config->period_count * config->period_size;
943 }
944 else
945 sparams.stop_threshold = config->stop_threshold;
946
947 if (!pcm->config.avail_min) {
948 if (pcm->flags & PCM_MMAP)
949 pcm->config.avail_min = sparams.avail_min = pcm->config.period_size;
950 else
951 pcm->config.avail_min = sparams.avail_min = 1;
952 } else
953 sparams.avail_min = config->avail_min;
954
955 sparams.xfer_align = config->period_size / 2; /* needed for old kernels */
956 sparams.silence_threshold = config->silence_threshold;
957 sparams.silence_size = config->silence_size;
958 pcm->boundary = sparams.boundary = pcm->buffer_size;
959
960 while (pcm->boundary * 2 <= INT_MAX - pcm->buffer_size)
961 pcm->boundary *= 2;
962
963 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) {
964 oops(pcm, errno, "cannot set sw params");
965 goto fail;
966 }
967
968 rc = pcm_hw_mmap_status(pcm);
969 if (rc < 0) {
970 oops(pcm, rc, "mmap status failed");
971 goto fail;
972 }
973
974 #ifdef SNDRV_PCM_IOCTL_TTSTAMP
975 if (pcm->flags & PCM_MONOTONIC) {
976 int arg = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
977 rc = ioctl(pcm->fd, SNDRV_PCM_IOCTL_TTSTAMP, &arg);
978 if (rc < 0) {
979 oops(pcm, rc, "cannot set timestamp type");
980 goto fail;
981 }
982 }
983 #endif
984
985 pcm->underruns = 0;
986 return pcm;
987
988 fail:
989 if (flags & PCM_MMAP)
990 munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
991 fail_close:
992 close(pcm->fd);
993 pcm->fd = -1;
994 return pcm;
995 }
996
pcm_is_ready(struct pcm * pcm)997 int pcm_is_ready(struct pcm *pcm)
998 {
999 return pcm->fd >= 0;
1000 }
1001
pcm_prepare(struct pcm * pcm)1002 int pcm_prepare(struct pcm *pcm)
1003 {
1004 if (pcm->prepared)
1005 return 0;
1006
1007 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
1008 return oops(pcm, errno, "cannot prepare channel");
1009
1010 pcm->prepared = 1;
1011 return 0;
1012 }
1013
pcm_start(struct pcm * pcm)1014 int pcm_start(struct pcm *pcm)
1015 {
1016 int prepare_error = pcm_prepare(pcm);
1017 if (prepare_error)
1018 return prepare_error;
1019
1020 if (pcm->flags & PCM_MMAP)
1021 pcm_sync_ptr(pcm, 0);
1022
1023 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
1024 return oops(pcm, errno, "cannot start channel");
1025
1026 pcm->running = 1;
1027 return 0;
1028 }
1029
pcm_stop(struct pcm * pcm)1030 int pcm_stop(struct pcm *pcm)
1031 {
1032 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0)
1033 return oops(pcm, errno, "cannot stop channel");
1034
1035 pcm->prepared = 0;
1036 pcm->running = 0;
1037 return 0;
1038 }
1039
pcm_mmap_playback_avail(struct pcm * pcm)1040 static inline int pcm_mmap_playback_avail(struct pcm *pcm)
1041 {
1042 int avail;
1043
1044 avail = pcm->mmap_status->hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
1045
1046 if (avail < 0)
1047 avail += pcm->boundary;
1048 else if (avail > (int)pcm->boundary)
1049 avail -= pcm->boundary;
1050
1051 return avail;
1052 }
1053
pcm_mmap_capture_avail(struct pcm * pcm)1054 static inline int pcm_mmap_capture_avail(struct pcm *pcm)
1055 {
1056 int avail = pcm->mmap_status->hw_ptr - pcm->mmap_control->appl_ptr;
1057 if (avail < 0)
1058 avail += pcm->boundary;
1059 return avail;
1060 }
1061
pcm_mmap_avail(struct pcm * pcm)1062 int pcm_mmap_avail(struct pcm *pcm)
1063 {
1064 pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC);
1065 if (pcm->flags & PCM_IN)
1066 return pcm_mmap_capture_avail(pcm);
1067 else
1068 return pcm_mmap_playback_avail(pcm);
1069 }
1070
pcm_mmap_appl_forward(struct pcm * pcm,int frames)1071 static void pcm_mmap_appl_forward(struct pcm *pcm, int frames)
1072 {
1073 unsigned int appl_ptr = pcm->mmap_control->appl_ptr;
1074 appl_ptr += frames;
1075
1076 /* check for boundary wrap */
1077 if (appl_ptr > pcm->boundary)
1078 appl_ptr -= pcm->boundary;
1079 pcm->mmap_control->appl_ptr = appl_ptr;
1080 }
1081
pcm_mmap_begin(struct pcm * pcm,void ** areas,unsigned int * offset,unsigned int * frames)1082 int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
1083 unsigned int *frames)
1084 {
1085 unsigned int continuous, copy_frames, avail;
1086
1087 /* return the mmap buffer */
1088 *areas = pcm->mmap_buffer;
1089
1090 /* and the application offset in frames */
1091 *offset = pcm->mmap_control->appl_ptr % pcm->buffer_size;
1092
1093 avail = pcm_mmap_avail(pcm);
1094 if (avail > pcm->buffer_size)
1095 avail = pcm->buffer_size;
1096 continuous = pcm->buffer_size - *offset;
1097
1098 /* we can only copy frames if the are availabale and continuos */
1099 copy_frames = *frames;
1100 if (copy_frames > avail)
1101 copy_frames = avail;
1102 if (copy_frames > continuous)
1103 copy_frames = continuous;
1104 *frames = copy_frames;
1105
1106 return 0;
1107 }
1108
pcm_mmap_commit(struct pcm * pcm,unsigned int offset,unsigned int frames)1109 int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames)
1110 {
1111 /* update the application pointer in userspace and kernel */
1112 pcm_mmap_appl_forward(pcm, frames);
1113 pcm_sync_ptr(pcm, 0);
1114
1115 return frames;
1116 }
1117
pcm_avail_update(struct pcm * pcm)1118 int pcm_avail_update(struct pcm *pcm)
1119 {
1120 pcm_sync_ptr(pcm, 0);
1121 return pcm_mmap_avail(pcm);
1122 }
1123
pcm_state(struct pcm * pcm)1124 int pcm_state(struct pcm *pcm)
1125 {
1126 int err = pcm_sync_ptr(pcm, 0);
1127 if (err < 0)
1128 return err;
1129
1130 return pcm->mmap_status->state;
1131 }
1132
pcm_set_avail_min(struct pcm * pcm,int avail_min)1133 int pcm_set_avail_min(struct pcm *pcm, int avail_min)
1134 {
1135 if ((~pcm->flags) & (PCM_MMAP | PCM_NOIRQ))
1136 return -ENOSYS;
1137
1138 pcm->config.avail_min = avail_min;
1139 return 0;
1140 }
1141
pcm_wait(struct pcm * pcm,int timeout)1142 int pcm_wait(struct pcm *pcm, int timeout)
1143 {
1144 struct pollfd pfd;
1145 int err;
1146
1147 pfd.fd = pcm->fd;
1148 pfd.events = POLLOUT | POLLERR | POLLNVAL;
1149
1150 do {
1151 /* let's wait for avail or timeout */
1152 err = poll(&pfd, 1, timeout);
1153 if (err < 0)
1154 return -errno;
1155
1156 /* timeout ? */
1157 if (err == 0)
1158 return 0;
1159
1160 /* have we been interrupted ? */
1161 if (errno == -EINTR)
1162 continue;
1163
1164 /* check for any errors */
1165 if (pfd.revents & (POLLERR | POLLNVAL)) {
1166 switch (pcm_state(pcm)) {
1167 case PCM_STATE_XRUN:
1168 return -EPIPE;
1169 case PCM_STATE_SUSPENDED:
1170 return -ESTRPIPE;
1171 case PCM_STATE_DISCONNECTED:
1172 return -ENODEV;
1173 default:
1174 return -EIO;
1175 }
1176 }
1177 /* poll again if fd not ready for IO */
1178 } while (!(pfd.revents & (POLLIN | POLLOUT)));
1179
1180 return 1;
1181 }
1182
pcm_get_poll_fd(struct pcm * pcm)1183 int pcm_get_poll_fd(struct pcm *pcm)
1184 {
1185 return pcm->fd;
1186 }
1187
pcm_mmap_transfer(struct pcm * pcm,const void * buffer,unsigned int bytes)1188 int pcm_mmap_transfer(struct pcm *pcm, const void *buffer, unsigned int bytes)
1189 {
1190 int err = 0, frames, avail;
1191 unsigned int offset = 0, count;
1192
1193 if (bytes == 0)
1194 return 0;
1195
1196 count = pcm_bytes_to_frames(pcm, bytes);
1197
1198 while (count > 0) {
1199
1200 /* get the available space for writing new frames */
1201 avail = pcm_avail_update(pcm);
1202 if (avail < 0) {
1203 fprintf(stderr, "cannot determine available mmap frames");
1204 return err;
1205 }
1206
1207 /* start the audio if we reach the threshold */
1208 if (!pcm->running &&
1209 (pcm->buffer_size - avail) >= pcm->config.start_threshold) {
1210 if (pcm_start(pcm) < 0) {
1211 fprintf(stderr, "start error: hw 0x%x app 0x%x avail 0x%x\n",
1212 (unsigned int)pcm->mmap_status->hw_ptr,
1213 (unsigned int)pcm->mmap_control->appl_ptr,
1214 avail);
1215 return -errno;
1216 }
1217 pcm->wait_for_avail_min = 0;
1218 }
1219
1220 /* sleep until we have space to write new frames */
1221 if (pcm->running) {
1222 /* enable waiting for avail_min threshold when less frames than we have to write
1223 * are available. */
1224 if (!pcm->wait_for_avail_min && (count > (unsigned int)avail))
1225 pcm->wait_for_avail_min = 1;
1226
1227 if (pcm->wait_for_avail_min && (avail < pcm->config.avail_min)) {
1228 int time = -1;
1229
1230 /* disable waiting for avail_min threshold to allow small amounts of data to be
1231 * written without waiting as long as there is enough room in buffer. */
1232 pcm->wait_for_avail_min = 0;
1233
1234 if (pcm->flags & PCM_NOIRQ)
1235 time = (pcm->config.avail_min - avail) / pcm->noirq_frames_per_msec;
1236
1237 err = pcm_wait(pcm, time);
1238 if (err < 0) {
1239 pcm->prepared = 0;
1240 pcm->running = 0;
1241 oops(pcm, err, "wait error: hw 0x%x app 0x%x avail 0x%x\n",
1242 (unsigned int)pcm->mmap_status->hw_ptr,
1243 (unsigned int)pcm->mmap_control->appl_ptr,
1244 avail);
1245 pcm->mmap_control->appl_ptr = 0;
1246 return err;
1247 }
1248 continue;
1249 }
1250 }
1251
1252 frames = count;
1253 if (frames > avail)
1254 frames = avail;
1255
1256 if (!frames)
1257 break;
1258
1259 /* copy frames from buffer */
1260 frames = pcm_mmap_transfer_areas(pcm, (void *)buffer, offset, frames);
1261 if (frames < 0) {
1262 fprintf(stderr, "write error: hw 0x%x app 0x%x avail 0x%x\n",
1263 (unsigned int)pcm->mmap_status->hw_ptr,
1264 (unsigned int)pcm->mmap_control->appl_ptr,
1265 avail);
1266 return frames;
1267 }
1268
1269 offset += frames;
1270 count -= frames;
1271 }
1272
1273 return 0;
1274 }
1275
pcm_mmap_write(struct pcm * pcm,const void * data,unsigned int count)1276 int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count)
1277 {
1278 if ((~pcm->flags) & (PCM_OUT | PCM_MMAP))
1279 return -ENOSYS;
1280
1281 return pcm_mmap_transfer(pcm, (void *)data, count);
1282 }
1283
pcm_mmap_read(struct pcm * pcm,void * data,unsigned int count)1284 int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count)
1285 {
1286 if ((~pcm->flags) & (PCM_IN | PCM_MMAP))
1287 return -ENOSYS;
1288
1289 return pcm_mmap_transfer(pcm, data, count);
1290 }
1291
pcm_ioctl(struct pcm * pcm,int request,...)1292 int pcm_ioctl(struct pcm *pcm, int request, ...)
1293 {
1294 va_list ap;
1295 void * arg;
1296
1297 if (!pcm_is_ready(pcm))
1298 return -1;
1299
1300 va_start(ap, request);
1301 arg = va_arg(ap, void *);
1302 va_end(ap);
1303
1304 return ioctl(pcm->fd, request, arg);
1305 }
1306