blob: d12e5daa2147b15b2d23836036a6256040dca6a1 [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
336 *tstamp = pcm->mmap_status->tstamp;
337 if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
338 return -1;
339
340 hw_ptr = pcm->mmap_status->hw_ptr;
341 if (pcm->flags & PCM_IN)
342 frames = hw_ptr - pcm->mmap_control->appl_ptr;
343 else
344 frames = hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
345
346 if (frames < 0)
347 return -1;
348
349 *avail = (unsigned int)frames;
350
351 return 0;
352}
353
Simon Wilson79d39652011-05-25 13:44:23 -0700354int pcm_write(struct pcm *pcm, void *data, unsigned int count)
355{
356 struct snd_xferi x;
357
358 if (pcm->flags & PCM_IN)
359 return -EINVAL;
360
361 x.buf = data;
Simon Wilsonbc03b622011-06-15 17:19:01 -0700362 x.frames = count / (pcm->config.channels *
363 pcm_format_to_bits(pcm->config.format) / 8);
Simon Wilson79d39652011-05-25 13:44:23 -0700364
365 for (;;) {
366 if (!pcm->running) {
367 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE))
368 return oops(pcm, errno, "cannot prepare channel");
369 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x))
370 return oops(pcm, errno, "cannot write initial data");
371 pcm->running = 1;
372 return 0;
373 }
374 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) {
375 pcm->running = 0;
376 if (errno == EPIPE) {
377 /* we failed to make our window -- try to restart */
378 pcm->underruns++;
379 continue;
380 }
381 return oops(pcm, errno, "cannot write stream data");
382 }
383 return 0;
384 }
385}
386
387int pcm_read(struct pcm *pcm, void *data, unsigned int count)
388{
389 struct snd_xferi x;
390
391 if (!(pcm->flags & PCM_IN))
392 return -EINVAL;
393
394 x.buf = data;
Simon Wilsonbc03b622011-06-15 17:19:01 -0700395 x.frames = count / (pcm->config.channels *
396 pcm_format_to_bits(pcm->config.format) / 8);
Simon Wilson79d39652011-05-25 13:44:23 -0700397
398 for (;;) {
399 if (!pcm->running) {
400 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE))
401 return oops(pcm, errno, "cannot prepare channel");
402 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START))
403 return oops(pcm, errno, "cannot start channel");
404 pcm->running = 1;
405 }
406 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_READI_FRAMES, &x)) {
407 pcm->running = 0;
408 if (errno == EPIPE) {
409 /* we failed to make our window -- try to restart */
410 pcm->underruns++;
411 continue;
412 }
413 return oops(pcm, errno, "cannot read stream data");
414 }
415 return 0;
416 }
417}
418
419static struct pcm bad_pcm = {
420 .fd = -1,
421};
422
423int pcm_close(struct pcm *pcm)
424{
425 if (pcm == &bad_pcm)
426 return 0;
427
Eric Laurent40b018e2011-06-18 10:10:23 -0700428 pcm_hw_munmap_status(pcm);
429
Liam Girdwood6be28f12011-10-13 12:59:51 -0700430 if (pcm->flags & PCM_MMAP) {
431 pcm_stop(pcm);
432 munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
433 }
434
Simon Wilson79d39652011-05-25 13:44:23 -0700435 if (pcm->fd >= 0)
436 close(pcm->fd);
437 pcm->running = 0;
438 pcm->buffer_size = 0;
439 pcm->fd = -1;
Eric Laurent40b018e2011-06-18 10:10:23 -0700440 free(pcm);
Simon Wilson79d39652011-05-25 13:44:23 -0700441 return 0;
442}
443
Simon Wilson1bd580f2011-06-02 15:58:41 -0700444struct pcm *pcm_open(unsigned int card, unsigned int device,
445 unsigned int flags, struct pcm_config *config)
Simon Wilson79d39652011-05-25 13:44:23 -0700446{
Simon Wilson79d39652011-05-25 13:44:23 -0700447 struct pcm *pcm;
448 struct snd_pcm_info info;
449 struct snd_pcm_hw_params params;
450 struct snd_pcm_sw_params sparams;
Simon Wilson1bd580f2011-06-02 15:58:41 -0700451 char fn[256];
Eric Laurent40b018e2011-06-18 10:10:23 -0700452 int rc;
Simon Wilson79d39652011-05-25 13:44:23 -0700453
454 pcm = calloc(1, sizeof(struct pcm));
455 if (!pcm || !config)
456 return &bad_pcm; /* TODO: could support default config here */
457
458 pcm->config = *config;
459
Simon Wilson1bd580f2011-06-02 15:58:41 -0700460 snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
461 flags & PCM_IN ? 'c' : 'p');
Simon Wilson79d39652011-05-25 13:44:23 -0700462
463 pcm->flags = flags;
Simon Wilson1bd580f2011-06-02 15:58:41 -0700464 pcm->fd = open(fn, O_RDWR);
Simon Wilson79d39652011-05-25 13:44:23 -0700465 if (pcm->fd < 0) {
Simon Wilson1bd580f2011-06-02 15:58:41 -0700466 oops(pcm, errno, "cannot open device '%s'", fn);
Simon Wilson79d39652011-05-25 13:44:23 -0700467 return pcm;
468 }
469
470 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_INFO, &info)) {
Simon Wilson851aa5c2011-05-30 21:18:26 -0700471 oops(pcm, errno, "cannot get info");
Liam Girdwood6be28f12011-10-13 12:59:51 -0700472 goto fail_close;
Simon Wilson79d39652011-05-25 13:44:23 -0700473 }
474
475 param_init(&params);
Simon Wilson79d39652011-05-25 13:44:23 -0700476 param_set_mask(&params, SNDRV_PCM_HW_PARAM_FORMAT,
477 pcm_format_to_alsa(config->format));
478 param_set_mask(&params, SNDRV_PCM_HW_PARAM_SUBFORMAT,
479 SNDRV_PCM_SUBFORMAT_STD);
480 param_set_min(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
481 param_set_int(&params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
482 pcm_format_to_bits(config->format));
483 param_set_int(&params, SNDRV_PCM_HW_PARAM_FRAME_BITS,
484 pcm_format_to_bits(config->format) * config->channels);
485 param_set_int(&params, SNDRV_PCM_HW_PARAM_CHANNELS,
486 config->channels);
487 param_set_int(&params, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
488 param_set_int(&params, SNDRV_PCM_HW_PARAM_RATE, config->rate);
489
Liam Girdwood6be28f12011-10-13 12:59:51 -0700490 if (flags & PCM_NOIRQ) {
491
492 if (!(flags & PCM_MMAP)) {
493 oops(pcm, -EINVAL, "noirq only currently supported with mmap().");
494 goto fail;
495 }
496
497 params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
498 pcm->noirq_frames_per_msec = config->rate / 1000;
499 }
500
501 if (flags & PCM_MMAP)
502 param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
503 SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
504 else
505 param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
506 SNDRV_PCM_ACCESS_RW_INTERLEAVED);
507
Simon Wilson79d39652011-05-25 13:44:23 -0700508 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params)) {
509 oops(pcm, errno, "cannot set hw params");
Liam Girdwood6be28f12011-10-13 12:59:51 -0700510 goto fail_close;
Simon Wilson79d39652011-05-25 13:44:23 -0700511 }
512
Liam Girdwood6be28f12011-10-13 12:59:51 -0700513 /* get our refined hw_params */
514 config->period_size = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
515 config->period_count = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIODS);
516 pcm->buffer_size = config->period_count * config->period_size;
517
518 if (flags & PCM_MMAP) {
519 pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size),
520 PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0);
521 if (pcm->mmap_buffer == MAP_FAILED) {
522 oops(pcm, -errno, "failed to mmap buffer %d bytes\n",
523 pcm_frames_to_bytes(pcm, pcm->buffer_size));
524 goto fail_close;
525 }
526 }
527
528
Simon Wilson79d39652011-05-25 13:44:23 -0700529 memset(&sparams, 0, sizeof(sparams));
Eric Laurent40b018e2011-06-18 10:10:23 -0700530 sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
Simon Wilson79d39652011-05-25 13:44:23 -0700531 sparams.period_step = 1;
532 sparams.avail_min = 1;
John Grossman3bb114a2011-07-21 10:59:55 -0700533
534 if (!config->start_threshold)
Liam Girdwood6be28f12011-10-13 12:59:51 -0700535 pcm->config.start_threshold = sparams.start_threshold =
536 config->period_count * config->period_size / 2;
John Grossman3bb114a2011-07-21 10:59:55 -0700537 else
538 sparams.start_threshold = config->start_threshold;
539
Liam Girdwood6be28f12011-10-13 12:59:51 -0700540 /* pick a high stop threshold - todo: does this need further tuning */
John Grossman3bb114a2011-07-21 10:59:55 -0700541 if (!config->stop_threshold)
Liam Girdwood6be28f12011-10-13 12:59:51 -0700542 pcm->config.stop_threshold = sparams.stop_threshold =
543 config->period_count * config->period_size * 10;
John Grossman3bb114a2011-07-21 10:59:55 -0700544 else
545 sparams.stop_threshold = config->stop_threshold;
546
Simon Wilson79d39652011-05-25 13:44:23 -0700547 sparams.xfer_align = config->period_size / 2; /* needed for old kernels */
548 sparams.silence_size = 0;
John Grossman3bb114a2011-07-21 10:59:55 -0700549 sparams.silence_threshold = config->silence_threshold;
Liam Girdwood6be28f12011-10-13 12:59:51 -0700550 pcm->boundary = sparams.boundary = pcm->buffer_size;
John Grossman3bb114a2011-07-21 10:59:55 -0700551
Liam Girdwood6be28f12011-10-13 12:59:51 -0700552 while (pcm->boundary * 2 <= LONG_MAX - pcm->buffer_size)
553 pcm->boundary *= 2;
Simon Wilson79d39652011-05-25 13:44:23 -0700554
555 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) {
556 oops(pcm, errno, "cannot set sw params");
557 goto fail;
558 }
559
Eric Laurent40b018e2011-06-18 10:10:23 -0700560 rc = pcm_hw_mmap_status(pcm);
561 if (rc < 0) {
562 oops(pcm, rc, "mmap status failed");
563 goto fail;
564 }
565
Simon Wilson79d39652011-05-25 13:44:23 -0700566 pcm->underruns = 0;
567 return pcm;
568
569fail:
Liam Girdwood6be28f12011-10-13 12:59:51 -0700570 if (flags & PCM_MMAP)
571 munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
572fail_close:
Simon Wilson79d39652011-05-25 13:44:23 -0700573 close(pcm->fd);
574 pcm->fd = -1;
575 return pcm;
576}
577
578int pcm_is_ready(struct pcm *pcm)
579{
580 return pcm->fd >= 0;
581}
Simon Wilsond6458e62011-06-21 14:58:11 -0700582
583int pcm_start(struct pcm *pcm)
584{
585 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
586 return oops(pcm, errno, "cannot prepare channel");
Liam Girdwood6be28f12011-10-13 12:59:51 -0700587
588 if (pcm->flags & PCM_MMAP)
589 pcm_sync_ptr(pcm, 0);
590
Simon Wilsond6458e62011-06-21 14:58:11 -0700591 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
592 return oops(pcm, errno, "cannot start channel");
593
Liam Girdwood6be28f12011-10-13 12:59:51 -0700594 pcm->running = 1;
Simon Wilsond6458e62011-06-21 14:58:11 -0700595 return 0;
596}
597
598int pcm_stop(struct pcm *pcm)
599{
600 if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0)
601 return oops(pcm, errno, "cannot stop channel");
602
Liam Girdwood6be28f12011-10-13 12:59:51 -0700603 pcm->running = 0;
Simon Wilsond6458e62011-06-21 14:58:11 -0700604 return 0;
605}
606
Liam Girdwood6be28f12011-10-13 12:59:51 -0700607static inline int pcm_mmap_playback_avail(struct pcm *pcm)
608{
609 int avail;
610
611 avail = pcm->mmap_status->hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
612
613 if (avail < 0)
614 avail += pcm->boundary;
615 else if (avail > (int)pcm->boundary)
616 avail -= pcm->boundary;
617
618 return avail;
619}
620
621static inline int pcm_mmap_capture_avail(struct pcm *pcm)
622{
623 int avail = pcm->mmap_status->hw_ptr - pcm->mmap_control->appl_ptr;
624 if (avail < 0)
625 avail += pcm->boundary;
626 return avail;
627}
628
629static inline int pcm_mmap_avail(struct pcm *pcm)
630{
631 pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC);
632 if (pcm->flags & PCM_IN)
633 return pcm_mmap_capture_avail(pcm);
634 else
635 return pcm_mmap_playback_avail(pcm);
636}
637
638static void pcm_mmap_appl_forward(struct pcm *pcm, int frames)
639{
640 unsigned int appl_ptr = pcm->mmap_control->appl_ptr;
641 appl_ptr += frames;
642
643 /* check for boundary wrap */
644 if (appl_ptr > pcm->boundary)
645 appl_ptr -= pcm->boundary;
646 pcm->mmap_control->appl_ptr = appl_ptr;
647}
648
649int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
650 unsigned int *frames)
651{
652 unsigned int continuous, copy_frames, avail;
653
654 /* return the mmap buffer */
655 *areas = pcm->mmap_buffer;
656
657 /* and the application offset in frames */
658 *offset = pcm->mmap_control->appl_ptr % pcm->buffer_size;
659
660 avail = pcm_mmap_avail(pcm);
661 if (avail > pcm->buffer_size)
662 avail = pcm->buffer_size;
663 continuous = pcm->buffer_size - *offset;
664
665 /* we can only copy frames if the are availabale and continuos */
666 copy_frames = *frames;
667 if (copy_frames > avail)
668 copy_frames = avail;
669 if (copy_frames > continuous)
670 copy_frames = continuous;
671 *frames = copy_frames;
672
673 return 0;
674}
675
676int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames)
677{
678 /* update the application pointer in userspace and kernel */
679 pcm_mmap_appl_forward(pcm, frames);
680 pcm_sync_ptr(pcm, 0);
681
682 return frames;
683}
684
685int pcm_avail_update(struct pcm *pcm)
686{
687 pcm_sync_ptr(pcm, 0);
688 return pcm_mmap_avail(pcm);
689}
690
691int pcm_state(struct pcm *pcm)
692{
693 int err = pcm_sync_ptr(pcm, 0);
694 if (err < 0)
695 return err;
696
697 return pcm->mmap_status->state;
698}
699
700int pcm_wait(struct pcm *pcm, int timeout)
701{
702 struct pollfd pfd;
703 unsigned short revents = 0;
704 int err;
705
706 pfd.fd = pcm->fd;
707 pfd.events = POLLOUT | POLLERR | POLLNVAL;
708
709 do {
710 /* let's wait for avail or timeout */
711 err = poll(&pfd, 1, timeout);
712 if (err < 0)
713 return -errno;
714
715 /* timeout ? */
716 if (err == 0)
717 return 0;
718
719 /* have we been interrupted ? */
720 if (errno == -EINTR)
721 continue;
722
723 /* check for any errors */
724 if (pfd.revents & (POLLERR | POLLNVAL)) {
725 switch (pcm_state(pcm)) {
726 case PCM_STATE_XRUN:
727 return -EPIPE;
728 case PCM_STATE_SUSPENDED:
729 return -ESTRPIPE;
730 case PCM_STATE_DISCONNECTED:
731 return -ENODEV;
732 default:
733 return -EIO;
734 }
735 }
736 /* poll again if fd not ready for IO */
737 } while (!(pfd.revents & (POLLIN | POLLOUT)));
738
739 return 1;
740}
741
742int pcm_mmap_write(struct pcm *pcm, void *buffer, unsigned int bytes)
743{
744 int err = 0, frames, avail;
745 unsigned int offset = 0, count;
746
747 if (bytes == 0)
748 return 0;
749
750 count = pcm_bytes_to_frames(pcm, bytes);
751
752 while (count > 0) {
753
754 /* get the available space for writing new frames */
755 avail = pcm_avail_update(pcm);
756 if (avail < 0) {
757 fprintf(stderr, "cannot determine available mmap frames");
758 return err;
759 }
760
761 /* start the audio if we reach the threshold */
762 if (!pcm->running &&
763 (pcm->buffer_size - avail) >= pcm->config.start_threshold) {
764 if (pcm_start(pcm) < 0) {
765 fprintf(stderr, "start error: hw 0x%x app 0x%x avail 0x%x\n",
766 (unsigned int)pcm->mmap_status->hw_ptr,
767 (unsigned int)pcm->mmap_control->appl_ptr,
768 avail);
769 return -errno;
770 }
771 }
772
773 /* sleep until we have space to write new frames */
774 if (pcm->running &&
775 (unsigned int)avail < pcm->mmap_control->avail_min) {
776 int time = -1;
777
778 if (pcm->flags & PCM_NOIRQ)
779 time = (pcm->buffer_size - avail - pcm->mmap_control->avail_min)
780 / pcm->noirq_frames_per_msec;
781
782 err = pcm_wait(pcm, time);
783 if (err < 0) {
784 pcm->running = 0;
785 fprintf(stderr, "wait error: hw 0x%x app 0x%x avail 0x%x\n",
786 (unsigned int)pcm->mmap_status->hw_ptr,
787 (unsigned int)pcm->mmap_control->appl_ptr,
788 avail);
789 pcm->mmap_control->appl_ptr = 0;
790 return err;
791 }
792 continue;
793 }
794
795 frames = count;
796 if (frames > avail)
797 frames = avail;
798
799 if (!frames)
800 break;
801
802 /* copy frames from buffer */
803 frames = pcm_mmap_write_areas(pcm, buffer, offset, frames);
804 if (frames < 0) {
805 fprintf(stderr, "write error: hw 0x%x app 0x%x avail 0x%x\n",
806 (unsigned int)pcm->mmap_status->hw_ptr,
807 (unsigned int)pcm->mmap_control->appl_ptr,
808 avail);
809 return frames;
810 }
811
812 offset += frames;
813 count -= frames;
814 }
815
816_end:
817 return 0;
818}