blob: 010d0542bf3f088af916a33c66410a1a7788595c [file] [log] [blame]
Simon Wilson79d39652011-05-25 13:44:23 -07001/* 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>
Liam Girdwood6be28f12011-10-13 12:59:51 -070036#include <poll.h>
Simon Wilson79d39652011-05-25 13:44:23 -070037
38#include <sys/ioctl.h>
39#include <sys/mman.h>
40#include <sys/time.h>
Liam Girdwood6be28f12011-10-13 12:59:51 -070041#include <limits.h>
Simon Wilson79d39652011-05-25 13:44:23 -070042
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
Liam Girdwood6be28f12011-10-13 12:59:51 -070052#define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2)
Simon Wilson79d39652011-05-25 13:44:23 -070053
54static inline int param_is_mask(int p)
55{
56 return (p >= SNDRV_PCM_HW_PARAM_FIRST_MASK) &&
57 (p <= SNDRV_PCM_HW_PARAM_LAST_MASK);
58}
59
60static inline int param_is_interval(int p)
61{
62 return (p >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL) &&
63 (p <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL);
64}
65
66static inline struct snd_interval *param_to_interval(struct snd_pcm_hw_params *p, int n)
67{
68 return &(p->intervals[n - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]);
69}
70
71static inline struct snd_mask *param_to_mask(struct snd_pcm_hw_params *p, int n)
72{
73 return &(p->masks[n - SNDRV_PCM_HW_PARAM_FIRST_MASK]);
74}
75
76static void param_set_mask(struct snd_pcm_hw_params *p, int n, unsigned int bit)
77{
78 if (bit >= SNDRV_MASK_MAX)
79 return;
80 if (param_is_mask(n)) {
81 struct snd_mask *m = param_to_mask(p, n);
82 m->bits[0] = 0;
83 m->bits[1] = 0;
84 m->bits[bit >> 5] |= (1 << (bit & 31));
85 }
86}
87
88static void param_set_min(struct snd_pcm_hw_params *p, int n, unsigned int val)
89{
90 if (param_is_interval(n)) {
91 struct snd_interval *i = param_to_interval(p, n);
92 i->min = val;
93 }
94}
95
96static void param_set_max(struct snd_pcm_hw_params *p, int n, unsigned int val)
97{
98 if (param_is_interval(n)) {
99 struct snd_interval *i = param_to_interval(p, n);
100 i->max = val;
101 }
102}
103
104static void param_set_int(struct snd_pcm_hw_params *p, int n, unsigned int val)
105{
106 if (param_is_interval(n)) {
107 struct snd_interval *i = param_to_interval(p, n);
108 i->min = val;
109 i->max = val;
110 i->integer = 1;
111 }
112}
113
Liam Girdwood6be28f12011-10-13 12:59:51 -0700114static unsigned int param_get_int(struct snd_pcm_hw_params *p, int n)
115{
116 if (param_is_interval(n)) {
117 struct snd_interval *i = param_to_interval(p, n);
118 if (i->integer)
119 return i->max;
120 }
121 return 0;
122}
123
Simon Wilson79d39652011-05-25 13:44:23 -0700124static void param_init(struct snd_pcm_hw_params *p)
125{
126 int n;
Simon Wilson98c1f162011-06-07 16:12:32 -0700127
Simon Wilson79d39652011-05-25 13:44:23 -0700128 memset(p, 0, sizeof(*p));
129 for (n = SNDRV_PCM_HW_PARAM_FIRST_MASK;
130 n <= SNDRV_PCM_HW_PARAM_LAST_MASK; n++) {
131 struct snd_mask *m = param_to_mask(p, n);
132 m->bits[0] = ~0;
133 m->bits[1] = ~0;
134 }
135 for (n = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL;
136 n <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; n++) {
137 struct snd_interval *i = param_to_interval(p, n);
138 i->min = 0;
139 i->max = ~0;
140 }
141}
142
143#define PCM_ERROR_MAX 128
144
145struct pcm {
146 int fd;
147 unsigned int flags;
148 int running:1;
149 int underruns;
150 unsigned int buffer_size;
Liam Girdwood6be28f12011-10-13 12:59:51 -0700151 unsigned int boundary;
Simon Wilson79d39652011-05-25 13:44:23 -0700152 char error[PCM_ERROR_MAX];
153 struct pcm_config config;
Eric Laurent40b018e2011-06-18 10:10:23 -0700154 struct snd_pcm_mmap_status *mmap_status;
155 struct snd_pcm_mmap_control *mmap_control;
156 struct snd_pcm_sync_ptr *sync_ptr;
Liam Girdwood6be28f12011-10-13 12:59:51 -0700157 void *mmap_buffer;
158 unsigned int noirq_frames_per_msec;
Simon Wilson79d39652011-05-25 13:44:23 -0700159};
160
Simon Wilson851aa5c2011-05-30 21:18:26 -0700161unsigned int pcm_get_buffer_size(struct pcm *pcm)
Simon Wilson79d39652011-05-25 13:44:23 -0700162{
163 return pcm->buffer_size;
164}
165
166const char* pcm_get_error(struct pcm *pcm)
167{
168 return pcm->error;
169}
170
171static int oops(struct pcm *pcm, int e, const char *fmt, ...)
172{
173 va_list ap;
174 int sz;
175
176 va_start(ap, fmt);
177 vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap);
178 va_end(ap);
179 sz = strlen(pcm->error);
180
181 if (errno)
182 snprintf(pcm->error + sz, PCM_ERROR_MAX - sz,
183 ": %s", strerror(e));
184 return -1;
185}
186
Simon Wilsonbc03b622011-06-15 17:19:01 -0700187static unsigned int pcm_format_to_alsa(enum pcm_format format)
188{
189 switch (format) {
190 case PCM_FORMAT_S32_LE:
191 return SNDRV_PCM_FORMAT_S32_LE;
192 default:
193 case PCM_FORMAT_S16_LE:
194 return SNDRV_PCM_FORMAT_S16_LE;
195 };
196}
197
198static unsigned int pcm_format_to_bits(enum pcm_format format)
199{
200 switch (format) {
201 case PCM_FORMAT_S32_LE:
202 return 32;
203 default:
204 case PCM_FORMAT_S16_LE:
205 return 16;
206 };
207}
208
Liam Girdwood6be28f12011-10-13 12:59:51 -0700209unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes)
210{
211 return bytes / (pcm->config.channels *
212 (pcm_format_to_bits(pcm->config.format) >> 3));
213}
214
215unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames)
216{
217 return frames * pcm->config.channels *
218 (pcm_format_to_bits(pcm->config.format) >> 3);
219}
220
Eric Laurent40b018e2011-06-18 10:10:23 -0700221static int pcm_sync_ptr(struct pcm *pcm, int flags) {
222 if (pcm->sync_ptr) {
223 pcm->sync_ptr->flags = flags;
224 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SYNC_PTR, pcm->sync_ptr) < 0)
225 return -1;
226 }
227 return 0;
228}
229
230static int pcm_hw_mmap_status(struct pcm *pcm) {
231
232 if (pcm->sync_ptr)
233 return 0;
234
235 int page_size = sysconf(_SC_PAGE_SIZE);
236 pcm->mmap_status = mmap(NULL, page_size, PROT_READ, MAP_FILE | MAP_SHARED,
237 pcm->fd, SNDRV_PCM_MMAP_OFFSET_STATUS);
238 if (pcm->mmap_status == MAP_FAILED)
239 pcm->mmap_status = NULL;
240 if (!pcm->mmap_status)
241 goto mmap_error;
242
243 pcm->mmap_control = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
244 MAP_FILE | MAP_SHARED, pcm->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL);
245 if (pcm->mmap_control == MAP_FAILED)
246 pcm->mmap_control = NULL;
247 if (!pcm->mmap_control) {
248 munmap(pcm->mmap_status, page_size);
249 pcm->mmap_status = NULL;
250 goto mmap_error;
251 }
252 pcm->mmap_control->avail_min = 1;
253
254 return 0;
255
256mmap_error:
257
258 pcm->sync_ptr = calloc(1, sizeof(*pcm->sync_ptr));
259 if (!pcm->sync_ptr)
260 return -ENOMEM;
261 pcm->mmap_status = &pcm->sync_ptr->s.status;
262 pcm->mmap_control = &pcm->sync_ptr->c.control;
263 pcm->mmap_control->avail_min = 1;
264 pcm_sync_ptr(pcm, 0);
265
266 return 0;
267}
268
269static void pcm_hw_munmap_status(struct pcm *pcm) {
270 if (pcm->sync_ptr) {
271 free(pcm->sync_ptr);
272 pcm->sync_ptr = NULL;
273 } else {
274 int page_size = sysconf(_SC_PAGE_SIZE);
275 if (pcm->mmap_status)
276 munmap(pcm->mmap_status, page_size);
277 if (pcm->mmap_control)
278 munmap(pcm->mmap_control, page_size);
279 }
280 pcm->mmap_status = NULL;
281 pcm->mmap_control = NULL;
282}
283
Liam Girdwood6be28f12011-10-13 12:59:51 -0700284static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset,
285 const char *src, unsigned int src_offset,
286 unsigned int frames)
287{
288 int size_bytes = pcm_frames_to_bytes(pcm, frames);
289 int pcm_offset_bytes = pcm_frames_to_bytes(pcm, pcm_offset);
290 int src_offset_bytes = pcm_frames_to_bytes(pcm, src_offset);
291
292 /* interleaved only atm */
293 memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes,
294 src + src_offset_bytes, size_bytes);
295 return 0;
296}
297
298static int pcm_mmap_write_areas(struct pcm *pcm, char *src,
299 unsigned int offset, unsigned int size)
300{
301 void *pcm_areas;
302 int commit;
303 unsigned int pcm_offset, frames, count = 0;
304
305 while (size > 0) {
306 frames = size;
307 pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames);
308 pcm_areas_copy(pcm, pcm_offset, src, offset, frames);
309 commit = pcm_mmap_commit(pcm, pcm_offset, frames);
310 if (commit < 0) {
311 oops(pcm, commit, "failed to commit %d frames\n", frames);
312 return commit;
313 }
314
315 offset += commit;
316 count += commit;
317 size -= commit;
318 }
319 return count;
320}
321
Eric Laurent40b018e2011-06-18 10:10:23 -0700322int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
323 struct timespec *tstamp)
324{
325 int frames;
326 int rc;
327 snd_pcm_uframes_t hw_ptr;
328
329 if (!pcm_is_ready(pcm))
330 return -1;
331
332 rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_APPL|SNDRV_PCM_SYNC_PTR_HWSYNC);
333 if (rc < 0)
334 return -1;
335
Eric Laurent7db48582011-11-17 11:47:59 -0800336 if ((pcm->mmap_status->state != PCM_STATE_RUNNING) &&
337 (pcm->mmap_status->state != PCM_STATE_DRAINING))
Eric Laurentee9ba872011-11-15 19:04:03 -0800338 return -1;
339
Eric Laurent40b018e2011-06-18 10:10:23 -0700340 *tstamp = pcm->mmap_status->tstamp;
341 if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
342 return -1;
343
344 hw_ptr = pcm->mmap_status->hw_ptr;
345 if (pcm->flags & PCM_IN)
346 frames = hw_ptr - pcm->mmap_control->appl_ptr;
347 else
348 frames = hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
349
350 if (frames < 0)
351 return -1;
352
353 *avail = (unsigned int)frames;
354
355 return 0;
356}
357
Simon Wilson79d39652011-05-25 13:44:23 -0700358int pcm_write(struct pcm *pcm, void *data, unsigned int count)
359{
360 struct snd_xferi x;
361
362 if (pcm->flags & PCM_IN)
363 return -EINVAL;
364
365 x.buf = data;
Simon Wilsonbc03b622011-06-15 17:19:01 -0700366 x.frames = count / (pcm->config.channels *
367 pcm_format_to_bits(pcm->config.format) / 8);
Simon Wilson79d39652011-05-25 13:44:23 -0700368
369 for (;;) {
370 if (!pcm->running) {
371 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE))
372 return oops(pcm, errno, "cannot prepare channel");
373 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x))
374 return oops(pcm, errno, "cannot write initial data");
375 pcm->running = 1;
376 return 0;
377 }
378 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) {
379 pcm->running = 0;
380 if (errno == EPIPE) {
381 /* we failed to make our window -- try to restart */
382 pcm->underruns++;
383 continue;
384 }
385 return oops(pcm, errno, "cannot write stream data");
386 }
387 return 0;
388 }
389}
390
391int pcm_read(struct pcm *pcm, void *data, unsigned int count)
392{
393 struct snd_xferi x;
394
395 if (!(pcm->flags & PCM_IN))
396 return -EINVAL;
397
398 x.buf = data;
Simon Wilsonbc03b622011-06-15 17:19:01 -0700399 x.frames = count / (pcm->config.channels *
400 pcm_format_to_bits(pcm->config.format) / 8);
Simon Wilson79d39652011-05-25 13:44:23 -0700401
402 for (;;) {
403 if (!pcm->running) {
404 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE))
405 return oops(pcm, errno, "cannot prepare channel");
406 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START))
407 return oops(pcm, errno, "cannot start channel");
408 pcm->running = 1;
409 }
410 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_READI_FRAMES, &x)) {
411 pcm->running = 0;
412 if (errno == EPIPE) {
413 /* we failed to make our window -- try to restart */
414 pcm->underruns++;
415 continue;
416 }
417 return oops(pcm, errno, "cannot read stream data");
418 }
419 return 0;
420 }
421}
422
423static struct pcm bad_pcm = {
424 .fd = -1,
425};
426
427int pcm_close(struct pcm *pcm)
428{
429 if (pcm == &bad_pcm)
430 return 0;
431
Eric Laurent40b018e2011-06-18 10:10:23 -0700432 pcm_hw_munmap_status(pcm);
433
Liam Girdwood6be28f12011-10-13 12:59:51 -0700434 if (pcm->flags & PCM_MMAP) {
435 pcm_stop(pcm);
436 munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
437 }
438
Simon Wilson79d39652011-05-25 13:44:23 -0700439 if (pcm->fd >= 0)
440 close(pcm->fd);
441 pcm->running = 0;
442 pcm->buffer_size = 0;
443 pcm->fd = -1;
Eric Laurent40b018e2011-06-18 10:10:23 -0700444 free(pcm);
Simon Wilson79d39652011-05-25 13:44:23 -0700445 return 0;
446}
447
Simon Wilson1bd580f2011-06-02 15:58:41 -0700448struct pcm *pcm_open(unsigned int card, unsigned int device,
449 unsigned int flags, struct pcm_config *config)
Simon Wilson79d39652011-05-25 13:44:23 -0700450{
Simon Wilson79d39652011-05-25 13:44:23 -0700451 struct pcm *pcm;
452 struct snd_pcm_info info;
453 struct snd_pcm_hw_params params;
454 struct snd_pcm_sw_params sparams;
Simon Wilson1bd580f2011-06-02 15:58:41 -0700455 char fn[256];
Eric Laurent40b018e2011-06-18 10:10:23 -0700456 int rc;
Simon Wilson79d39652011-05-25 13:44:23 -0700457
458 pcm = calloc(1, sizeof(struct pcm));
459 if (!pcm || !config)
460 return &bad_pcm; /* TODO: could support default config here */
461
462 pcm->config = *config;
463
Simon Wilson1bd580f2011-06-02 15:58:41 -0700464 snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
465 flags & PCM_IN ? 'c' : 'p');
Simon Wilson79d39652011-05-25 13:44:23 -0700466
467 pcm->flags = flags;
Simon Wilson1bd580f2011-06-02 15:58:41 -0700468 pcm->fd = open(fn, O_RDWR);
Simon Wilson79d39652011-05-25 13:44:23 -0700469 if (pcm->fd < 0) {
Simon Wilson1bd580f2011-06-02 15:58:41 -0700470 oops(pcm, errno, "cannot open device '%s'", fn);
Simon Wilson79d39652011-05-25 13:44:23 -0700471 return pcm;
472 }
473
474 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_INFO, &info)) {
Simon Wilson851aa5c2011-05-30 21:18:26 -0700475 oops(pcm, errno, "cannot get info");
Liam Girdwood6be28f12011-10-13 12:59:51 -0700476 goto fail_close;
Simon Wilson79d39652011-05-25 13:44:23 -0700477 }
478
479 param_init(&params);
Simon Wilson79d39652011-05-25 13:44:23 -0700480 param_set_mask(&params, SNDRV_PCM_HW_PARAM_FORMAT,
481 pcm_format_to_alsa(config->format));
482 param_set_mask(&params, SNDRV_PCM_HW_PARAM_SUBFORMAT,
483 SNDRV_PCM_SUBFORMAT_STD);
484 param_set_min(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
485 param_set_int(&params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
486 pcm_format_to_bits(config->format));
487 param_set_int(&params, SNDRV_PCM_HW_PARAM_FRAME_BITS,
488 pcm_format_to_bits(config->format) * config->channels);
489 param_set_int(&params, SNDRV_PCM_HW_PARAM_CHANNELS,
490 config->channels);
491 param_set_int(&params, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
492 param_set_int(&params, SNDRV_PCM_HW_PARAM_RATE, config->rate);
493
Liam Girdwood6be28f12011-10-13 12:59:51 -0700494 if (flags & PCM_NOIRQ) {
495
496 if (!(flags & PCM_MMAP)) {
497 oops(pcm, -EINVAL, "noirq only currently supported with mmap().");
498 goto fail;
499 }
500
501 params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
502 pcm->noirq_frames_per_msec = config->rate / 1000;
503 }
504
505 if (flags & PCM_MMAP)
506 param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
507 SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
508 else
509 param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
510 SNDRV_PCM_ACCESS_RW_INTERLEAVED);
511
Simon Wilson79d39652011-05-25 13:44:23 -0700512 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params)) {
513 oops(pcm, errno, "cannot set hw params");
Liam Girdwood6be28f12011-10-13 12:59:51 -0700514 goto fail_close;
Simon Wilson79d39652011-05-25 13:44:23 -0700515 }
516
Liam Girdwood6be28f12011-10-13 12:59:51 -0700517 /* get our refined hw_params */
518 config->period_size = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
519 config->period_count = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIODS);
520 pcm->buffer_size = config->period_count * config->period_size;
521
522 if (flags & PCM_MMAP) {
523 pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size),
524 PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0);
525 if (pcm->mmap_buffer == MAP_FAILED) {
526 oops(pcm, -errno, "failed to mmap buffer %d bytes\n",
527 pcm_frames_to_bytes(pcm, pcm->buffer_size));
528 goto fail_close;
529 }
530 }
531
532
Simon Wilson79d39652011-05-25 13:44:23 -0700533 memset(&sparams, 0, sizeof(sparams));
Eric Laurent40b018e2011-06-18 10:10:23 -0700534 sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
Simon Wilson79d39652011-05-25 13:44:23 -0700535 sparams.period_step = 1;
536 sparams.avail_min = 1;
John Grossman3bb114a2011-07-21 10:59:55 -0700537
538 if (!config->start_threshold)
Liam Girdwood6be28f12011-10-13 12:59:51 -0700539 pcm->config.start_threshold = sparams.start_threshold =
540 config->period_count * config->period_size / 2;
John Grossman3bb114a2011-07-21 10:59:55 -0700541 else
542 sparams.start_threshold = config->start_threshold;
543
Liam Girdwood6be28f12011-10-13 12:59:51 -0700544 /* pick a high stop threshold - todo: does this need further tuning */
John Grossman3bb114a2011-07-21 10:59:55 -0700545 if (!config->stop_threshold)
Liam Girdwood6be28f12011-10-13 12:59:51 -0700546 pcm->config.stop_threshold = sparams.stop_threshold =
Eric Laurentee9ba872011-11-15 19:04:03 -0800547 config->period_count * config->period_size;
John Grossman3bb114a2011-07-21 10:59:55 -0700548 else
549 sparams.stop_threshold = config->stop_threshold;
550
Simon Wilson79d39652011-05-25 13:44:23 -0700551 sparams.xfer_align = config->period_size / 2; /* needed for old kernels */
552 sparams.silence_size = 0;
John Grossman3bb114a2011-07-21 10:59:55 -0700553 sparams.silence_threshold = config->silence_threshold;
Liam Girdwood6be28f12011-10-13 12:59:51 -0700554 pcm->boundary = sparams.boundary = pcm->buffer_size;
John Grossman3bb114a2011-07-21 10:59:55 -0700555
Liam Girdwood6be28f12011-10-13 12:59:51 -0700556 while (pcm->boundary * 2 <= LONG_MAX - pcm->buffer_size)
557 pcm->boundary *= 2;
Simon Wilson79d39652011-05-25 13:44:23 -0700558
559 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) {
560 oops(pcm, errno, "cannot set sw params");
561 goto fail;
562 }
563
Eric Laurent40b018e2011-06-18 10:10:23 -0700564 rc = pcm_hw_mmap_status(pcm);
565 if (rc < 0) {
566 oops(pcm, rc, "mmap status failed");
567 goto fail;
568 }
569
Simon Wilson79d39652011-05-25 13:44:23 -0700570 pcm->underruns = 0;
571 return pcm;
572
573fail:
Liam Girdwood6be28f12011-10-13 12:59:51 -0700574 if (flags & PCM_MMAP)
575 munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
576fail_close:
Simon Wilson79d39652011-05-25 13:44:23 -0700577 close(pcm->fd);
578 pcm->fd = -1;
579 return pcm;
580}
581
582int pcm_is_ready(struct pcm *pcm)
583{
584 return pcm->fd >= 0;
585}
Simon Wilsond6458e62011-06-21 14:58:11 -0700586
587int pcm_start(struct pcm *pcm)
588{
589 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
590 return oops(pcm, errno, "cannot prepare channel");
Liam Girdwood6be28f12011-10-13 12:59:51 -0700591
592 if (pcm->flags & PCM_MMAP)
593 pcm_sync_ptr(pcm, 0);
594
Simon Wilsond6458e62011-06-21 14:58:11 -0700595 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
596 return oops(pcm, errno, "cannot start channel");
597
Liam Girdwood6be28f12011-10-13 12:59:51 -0700598 pcm->running = 1;
Simon Wilsond6458e62011-06-21 14:58:11 -0700599 return 0;
600}
601
602int pcm_stop(struct pcm *pcm)
603{
604 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0)
605 return oops(pcm, errno, "cannot stop channel");
606
Liam Girdwood6be28f12011-10-13 12:59:51 -0700607 pcm->running = 0;
Simon Wilsond6458e62011-06-21 14:58:11 -0700608 return 0;
609}
610
Liam Girdwood6be28f12011-10-13 12:59:51 -0700611static inline int pcm_mmap_playback_avail(struct pcm *pcm)
612{
613 int avail;
614
615 avail = pcm->mmap_status->hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
616
617 if (avail < 0)
618 avail += pcm->boundary;
619 else if (avail > (int)pcm->boundary)
620 avail -= pcm->boundary;
621
622 return avail;
623}
624
625static inline int pcm_mmap_capture_avail(struct pcm *pcm)
626{
627 int avail = pcm->mmap_status->hw_ptr - pcm->mmap_control->appl_ptr;
628 if (avail < 0)
629 avail += pcm->boundary;
630 return avail;
631}
632
633static inline int pcm_mmap_avail(struct pcm *pcm)
634{
635 pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC);
636 if (pcm->flags & PCM_IN)
637 return pcm_mmap_capture_avail(pcm);
638 else
639 return pcm_mmap_playback_avail(pcm);
640}
641
642static void pcm_mmap_appl_forward(struct pcm *pcm, int frames)
643{
644 unsigned int appl_ptr = pcm->mmap_control->appl_ptr;
645 appl_ptr += frames;
646
647 /* check for boundary wrap */
648 if (appl_ptr > pcm->boundary)
649 appl_ptr -= pcm->boundary;
650 pcm->mmap_control->appl_ptr = appl_ptr;
651}
652
653int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
654 unsigned int *frames)
655{
656 unsigned int continuous, copy_frames, avail;
657
658 /* return the mmap buffer */
659 *areas = pcm->mmap_buffer;
660
661 /* and the application offset in frames */
662 *offset = pcm->mmap_control->appl_ptr % pcm->buffer_size;
663
664 avail = pcm_mmap_avail(pcm);
665 if (avail > pcm->buffer_size)
666 avail = pcm->buffer_size;
667 continuous = pcm->buffer_size - *offset;
668
669 /* we can only copy frames if the are availabale and continuos */
670 copy_frames = *frames;
671 if (copy_frames > avail)
672 copy_frames = avail;
673 if (copy_frames > continuous)
674 copy_frames = continuous;
675 *frames = copy_frames;
676
677 return 0;
678}
679
680int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames)
681{
682 /* update the application pointer in userspace and kernel */
683 pcm_mmap_appl_forward(pcm, frames);
684 pcm_sync_ptr(pcm, 0);
685
686 return frames;
687}
688
689int pcm_avail_update(struct pcm *pcm)
690{
691 pcm_sync_ptr(pcm, 0);
692 return pcm_mmap_avail(pcm);
693}
694
695int pcm_state(struct pcm *pcm)
696{
697 int err = pcm_sync_ptr(pcm, 0);
698 if (err < 0)
699 return err;
700
701 return pcm->mmap_status->state;
702}
703
704int pcm_wait(struct pcm *pcm, int timeout)
705{
706 struct pollfd pfd;
707 unsigned short revents = 0;
708 int err;
709
710 pfd.fd = pcm->fd;
711 pfd.events = POLLOUT | POLLERR | POLLNVAL;
712
713 do {
714 /* let's wait for avail or timeout */
715 err = poll(&pfd, 1, timeout);
716 if (err < 0)
717 return -errno;
718
719 /* timeout ? */
720 if (err == 0)
721 return 0;
722
723 /* have we been interrupted ? */
724 if (errno == -EINTR)
725 continue;
726
727 /* check for any errors */
728 if (pfd.revents & (POLLERR | POLLNVAL)) {
729 switch (pcm_state(pcm)) {
730 case PCM_STATE_XRUN:
731 return -EPIPE;
732 case PCM_STATE_SUSPENDED:
733 return -ESTRPIPE;
734 case PCM_STATE_DISCONNECTED:
735 return -ENODEV;
736 default:
737 return -EIO;
738 }
739 }
740 /* poll again if fd not ready for IO */
741 } while (!(pfd.revents & (POLLIN | POLLOUT)));
742
743 return 1;
744}
745
746int pcm_mmap_write(struct pcm *pcm, void *buffer, unsigned int bytes)
747{
748 int err = 0, frames, avail;
749 unsigned int offset = 0, count;
750
751 if (bytes == 0)
752 return 0;
753
754 count = pcm_bytes_to_frames(pcm, bytes);
755
756 while (count > 0) {
757
758 /* get the available space for writing new frames */
759 avail = pcm_avail_update(pcm);
760 if (avail < 0) {
761 fprintf(stderr, "cannot determine available mmap frames");
762 return err;
763 }
764
765 /* start the audio if we reach the threshold */
766 if (!pcm->running &&
767 (pcm->buffer_size - avail) >= pcm->config.start_threshold) {
768 if (pcm_start(pcm) < 0) {
769 fprintf(stderr, "start error: hw 0x%x app 0x%x avail 0x%x\n",
770 (unsigned int)pcm->mmap_status->hw_ptr,
771 (unsigned int)pcm->mmap_control->appl_ptr,
772 avail);
773 return -errno;
774 }
775 }
776
777 /* sleep until we have space to write new frames */
778 if (pcm->running &&
779 (unsigned int)avail < pcm->mmap_control->avail_min) {
780 int time = -1;
781
782 if (pcm->flags & PCM_NOIRQ)
783 time = (pcm->buffer_size - avail - pcm->mmap_control->avail_min)
784 / pcm->noirq_frames_per_msec;
785
786 err = pcm_wait(pcm, time);
787 if (err < 0) {
788 pcm->running = 0;
789 fprintf(stderr, "wait error: hw 0x%x app 0x%x avail 0x%x\n",
790 (unsigned int)pcm->mmap_status->hw_ptr,
791 (unsigned int)pcm->mmap_control->appl_ptr,
792 avail);
793 pcm->mmap_control->appl_ptr = 0;
794 return err;
795 }
796 continue;
797 }
798
799 frames = count;
800 if (frames > avail)
801 frames = avail;
802
803 if (!frames)
804 break;
805
806 /* copy frames from buffer */
807 frames = pcm_mmap_write_areas(pcm, buffer, offset, frames);
808 if (frames < 0) {
809 fprintf(stderr, "write error: hw 0x%x app 0x%x avail 0x%x\n",
810 (unsigned int)pcm->mmap_status->hw_ptr,
811 (unsigned int)pcm->mmap_control->appl_ptr,
812 avail);
813 return frames;
814 }
815
816 offset += frames;
817 count -= frames;
818 }
819
820_end:
821 return 0;
822}