Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / audio / ossaudio.c
1 /*
2 * QEMU OSS audio driver
3 *
4 * Copyright (c) 2003-2005 Vassili Karpov (malc)
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include <stdlib.h>
25 #include <sys/mman.h>
26 #include <sys/types.h>
27 #include <sys/ioctl.h>
28 #include <sys/soundcard.h>
29 #include "qemu-common.h"
30 #include "qemu/main-loop.h"
31 #include "qemu/host-utils.h"
32 #include "audio.h"
33
34 #define AUDIO_CAP "oss"
35 #include "audio_int.h"
36
37 #if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY
38 #define USE_DSP_POLICY
39 #endif
40
41 typedef struct OSSVoiceOut {
42 HWVoiceOut hw;
43 void *pcm_buf;
44 int fd;
45 int wpos;
46 int nfrags;
47 int fragsize;
48 int mmapped;
49 int pending;
50 } OSSVoiceOut;
51
52 typedef struct OSSVoiceIn {
53 HWVoiceIn hw;
54 void *pcm_buf;
55 int fd;
56 int nfrags;
57 int fragsize;
58 } OSSVoiceIn;
59
60 static struct {
61 int try_mmap;
62 int nfrags;
63 int fragsize;
64 const char *devpath_out;
65 const char *devpath_in;
66 int debug;
67 int exclusive;
68 int policy;
69 } conf = {
70 .try_mmap = 0,
71 .nfrags = 4,
72 .fragsize = 4096,
73 .devpath_out = "/dev/dsp",
74 .devpath_in = "/dev/dsp",
75 .debug = 0,
76 .exclusive = 0,
77 .policy = 5
78 };
79
80 struct oss_params {
81 int freq;
82 audfmt_e fmt;
83 int nchannels;
84 int nfrags;
85 int fragsize;
86 };
87
88 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
89 {
90 va_list ap;
91
92 va_start (ap, fmt);
93 AUD_vlog (AUDIO_CAP, fmt, ap);
94 va_end (ap);
95
96 AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
97 }
98
99 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
100 int err,
101 const char *typ,
102 const char *fmt,
103 ...
104 )
105 {
106 va_list ap;
107
108 AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
109
110 va_start (ap, fmt);
111 AUD_vlog (AUDIO_CAP, fmt, ap);
112 va_end (ap);
113
114 AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
115 }
116
117 static void oss_anal_close (int *fdp)
118 {
119 int err;
120
121 qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
122 err = close (*fdp);
123 if (err) {
124 oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
125 }
126 *fdp = -1;
127 }
128
129 static void oss_helper_poll_out (void *opaque)
130 {
131 (void) opaque;
132 audio_run ("oss_poll_out");
133 }
134
135 static void oss_helper_poll_in (void *opaque)
136 {
137 (void) opaque;
138 audio_run ("oss_poll_in");
139 }
140
141 static int oss_poll_out (HWVoiceOut *hw)
142 {
143 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
144
145 return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);
146 }
147
148 static int oss_poll_in (HWVoiceIn *hw)
149 {
150 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
151
152 return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);
153 }
154
155 static int oss_write (SWVoiceOut *sw, void *buf, int len)
156 {
157 return audio_pcm_sw_write (sw, buf, len);
158 }
159
160 static int aud_to_ossfmt (audfmt_e fmt, int endianness)
161 {
162 switch (fmt) {
163 case AUD_FMT_S8:
164 return AFMT_S8;
165
166 case AUD_FMT_U8:
167 return AFMT_U8;
168
169 case AUD_FMT_S16:
170 if (endianness) {
171 return AFMT_S16_BE;
172 }
173 else {
174 return AFMT_S16_LE;
175 }
176
177 case AUD_FMT_U16:
178 if (endianness) {
179 return AFMT_U16_BE;
180 }
181 else {
182 return AFMT_U16_LE;
183 }
184
185 default:
186 dolog ("Internal logic error: Bad audio format %d\n", fmt);
187 #ifdef DEBUG_AUDIO
188 abort ();
189 #endif
190 return AFMT_U8;
191 }
192 }
193
194 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
195 {
196 switch (ossfmt) {
197 case AFMT_S8:
198 *endianness = 0;
199 *fmt = AUD_FMT_S8;
200 break;
201
202 case AFMT_U8:
203 *endianness = 0;
204 *fmt = AUD_FMT_U8;
205 break;
206
207 case AFMT_S16_LE:
208 *endianness = 0;
209 *fmt = AUD_FMT_S16;
210 break;
211
212 case AFMT_U16_LE:
213 *endianness = 0;
214 *fmt = AUD_FMT_U16;
215 break;
216
217 case AFMT_S16_BE:
218 *endianness = 1;
219 *fmt = AUD_FMT_S16;
220 break;
221
222 case AFMT_U16_BE:
223 *endianness = 1;
224 *fmt = AUD_FMT_U16;
225 break;
226
227 default:
228 dolog ("Unrecognized audio format %d\n", ossfmt);
229 return -1;
230 }
231
232 return 0;
233 }
234
235 #if defined DEBUG_MISMATCHES || defined DEBUG
236 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
237 {
238 dolog ("parameter | requested value | obtained value\n");
239 dolog ("format | %10d | %10d\n", req->fmt, obt->fmt);
240 dolog ("channels | %10d | %10d\n",
241 req->nchannels, obt->nchannels);
242 dolog ("frequency | %10d | %10d\n", req->freq, obt->freq);
243 dolog ("nfrags | %10d | %10d\n", req->nfrags, obt->nfrags);
244 dolog ("fragsize | %10d | %10d\n",
245 req->fragsize, obt->fragsize);
246 }
247 #endif
248
249 #ifdef USE_DSP_POLICY
250 static int oss_get_version (int fd, int *version, const char *typ)
251 {
252 if (ioctl (fd, OSS_GETVERSION, &version)) {
253 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
254 /*
255 * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
256 * since 7.x, but currently only on the mixer device (or in
257 * the Linuxolator), and in the native version that part of
258 * the code is in fact never reached so the ioctl fails anyway.
259 * Until this is fixed, just check the errno and if its what
260 * FreeBSD's sound drivers return atm assume they are new enough.
261 */
262 if (errno == EINVAL) {
263 *version = 0x040000;
264 return 0;
265 }
266 #endif
267 oss_logerr2 (errno, typ, "Failed to get OSS version\n");
268 return -1;
269 }
270 return 0;
271 }
272 #endif
273
274 static int oss_open (int in, struct oss_params *req,
275 struct oss_params *obt, int *pfd)
276 {
277 int fd;
278 int oflags = conf.exclusive ? O_EXCL : 0;
279 audio_buf_info abinfo;
280 int fmt, freq, nchannels;
281 int setfragment = 1;
282 const char *dspname = in ? conf.devpath_in : conf.devpath_out;
283 const char *typ = in ? "ADC" : "DAC";
284
285 /* Kludge needed to have working mmap on Linux */
286 oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
287
288 fd = open (dspname, oflags | O_NONBLOCK);
289 if (-1 == fd) {
290 oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
291 return -1;
292 }
293
294 freq = req->freq;
295 nchannels = req->nchannels;
296 fmt = req->fmt;
297
298 if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
299 oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
300 goto err;
301 }
302
303 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
304 oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
305 req->nchannels);
306 goto err;
307 }
308
309 if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
310 oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
311 goto err;
312 }
313
314 if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
315 oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
316 goto err;
317 }
318
319 #ifdef USE_DSP_POLICY
320 if (conf.policy >= 0) {
321 int version;
322
323 if (!oss_get_version (fd, &version, typ)) {
324 if (conf.debug) {
325 dolog ("OSS version = %#x\n", version);
326 }
327
328 if (version >= 0x040000) {
329 int policy = conf.policy;
330 if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
331 oss_logerr2 (errno, typ,
332 "Failed to set timing policy to %d\n",
333 conf.policy);
334 goto err;
335 }
336 setfragment = 0;
337 }
338 }
339 }
340 #endif
341
342 if (setfragment) {
343 int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
344 if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
345 oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
346 req->nfrags, req->fragsize);
347 goto err;
348 }
349 }
350
351 if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
352 oss_logerr2 (errno, typ, "Failed to get buffer length\n");
353 goto err;
354 }
355
356 if (!abinfo.fragstotal || !abinfo.fragsize) {
357 AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
358 abinfo.fragstotal, abinfo.fragsize, typ);
359 goto err;
360 }
361
362 obt->fmt = fmt;
363 obt->nchannels = nchannels;
364 obt->freq = freq;
365 obt->nfrags = abinfo.fragstotal;
366 obt->fragsize = abinfo.fragsize;
367 *pfd = fd;
368
369 #ifdef DEBUG_MISMATCHES
370 if ((req->fmt != obt->fmt) ||
371 (req->nchannels != obt->nchannels) ||
372 (req->freq != obt->freq) ||
373 (req->fragsize != obt->fragsize) ||
374 (req->nfrags != obt->nfrags)) {
375 dolog ("Audio parameters mismatch\n");
376 oss_dump_info (req, obt);
377 }
378 #endif
379
380 #ifdef DEBUG
381 oss_dump_info (req, obt);
382 #endif
383 return 0;
384
385 err:
386 oss_anal_close (&fd);
387 return -1;
388 }
389
390 static void oss_write_pending (OSSVoiceOut *oss)
391 {
392 HWVoiceOut *hw = &oss->hw;
393
394 if (oss->mmapped) {
395 return;
396 }
397
398 while (oss->pending) {
399 int samples_written;
400 ssize_t bytes_written;
401 int samples_till_end = hw->samples - oss->wpos;
402 int samples_to_write = audio_MIN (oss->pending, samples_till_end);
403 int bytes_to_write = samples_to_write << hw->info.shift;
404 void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);
405
406 bytes_written = write (oss->fd, pcm, bytes_to_write);
407 if (bytes_written < 0) {
408 if (errno != EAGAIN) {
409 oss_logerr (errno, "failed to write %d bytes\n",
410 bytes_to_write);
411 }
412 break;
413 }
414
415 if (bytes_written & hw->info.align) {
416 dolog ("misaligned write asked for %d, but got %zd\n",
417 bytes_to_write, bytes_written);
418 return;
419 }
420
421 samples_written = bytes_written >> hw->info.shift;
422 oss->pending -= samples_written;
423 oss->wpos = (oss->wpos + samples_written) % hw->samples;
424 if (bytes_written - bytes_to_write) {
425 break;
426 }
427 }
428 }
429
430 static int oss_run_out (HWVoiceOut *hw, int live)
431 {
432 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
433 int err, decr;
434 struct audio_buf_info abinfo;
435 struct count_info cntinfo;
436 int bufsize;
437
438 bufsize = hw->samples << hw->info.shift;
439
440 if (oss->mmapped) {
441 int bytes, pos;
442
443 err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
444 if (err < 0) {
445 oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
446 return 0;
447 }
448
449 pos = hw->rpos << hw->info.shift;
450 bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);
451 decr = audio_MIN (bytes >> hw->info.shift, live);
452 }
453 else {
454 err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
455 if (err < 0) {
456 oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
457 return 0;
458 }
459
460 if (abinfo.bytes > bufsize) {
461 if (conf.debug) {
462 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
463 "please report your OS/audio hw to av1474@comtv.ru\n",
464 abinfo.bytes, bufsize);
465 }
466 abinfo.bytes = bufsize;
467 }
468
469 if (abinfo.bytes < 0) {
470 if (conf.debug) {
471 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
472 abinfo.bytes, bufsize);
473 }
474 return 0;
475 }
476
477 decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
478 if (!decr) {
479 return 0;
480 }
481 }
482
483 decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);
484 oss->pending += decr;
485 oss_write_pending (oss);
486
487 return decr;
488 }
489
490 static void oss_fini_out (HWVoiceOut *hw)
491 {
492 int err;
493 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
494
495 ldebug ("oss_fini\n");
496 oss_anal_close (&oss->fd);
497
498 if (oss->pcm_buf) {
499 if (oss->mmapped) {
500 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
501 if (err) {
502 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
503 oss->pcm_buf, hw->samples << hw->info.shift);
504 }
505 }
506 else {
507 g_free (oss->pcm_buf);
508 }
509 oss->pcm_buf = NULL;
510 }
511 }
512
513 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
514 {
515 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
516 struct oss_params req, obt;
517 int endianness;
518 int err;
519 int fd;
520 audfmt_e effective_fmt;
521 struct audsettings obt_as;
522
523 oss->fd = -1;
524
525 req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
526 req.freq = as->freq;
527 req.nchannels = as->nchannels;
528 req.fragsize = conf.fragsize;
529 req.nfrags = conf.nfrags;
530
531 if (oss_open (0, &req, &obt, &fd)) {
532 return -1;
533 }
534
535 err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
536 if (err) {
537 oss_anal_close (&fd);
538 return -1;
539 }
540
541 obt_as.freq = obt.freq;
542 obt_as.nchannels = obt.nchannels;
543 obt_as.fmt = effective_fmt;
544 obt_as.endianness = endianness;
545
546 audio_pcm_init_info (&hw->info, &obt_as);
547 oss->nfrags = obt.nfrags;
548 oss->fragsize = obt.fragsize;
549
550 if (obt.nfrags * obt.fragsize & hw->info.align) {
551 dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
552 obt.nfrags * obt.fragsize, hw->info.align + 1);
553 }
554
555 hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
556
557 oss->mmapped = 0;
558 if (conf.try_mmap) {
559 oss->pcm_buf = mmap (
560 NULL,
561 hw->samples << hw->info.shift,
562 PROT_READ | PROT_WRITE,
563 MAP_SHARED,
564 fd,
565 0
566 );
567 if (oss->pcm_buf == MAP_FAILED) {
568 oss_logerr (errno, "Failed to map %d bytes of DAC\n",
569 hw->samples << hw->info.shift);
570 }
571 else {
572 int err;
573 int trig = 0;
574 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
575 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
576 }
577 else {
578 trig = PCM_ENABLE_OUTPUT;
579 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
580 oss_logerr (
581 errno,
582 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
583 );
584 }
585 else {
586 oss->mmapped = 1;
587 }
588 }
589
590 if (!oss->mmapped) {
591 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
592 if (err) {
593 oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
594 oss->pcm_buf, hw->samples << hw->info.shift);
595 }
596 }
597 }
598 }
599
600 if (!oss->mmapped) {
601 oss->pcm_buf = audio_calloc (
602 AUDIO_FUNC,
603 hw->samples,
604 1 << hw->info.shift
605 );
606 if (!oss->pcm_buf) {
607 dolog (
608 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
609 hw->samples,
610 1 << hw->info.shift
611 );
612 oss_anal_close (&fd);
613 return -1;
614 }
615 }
616
617 oss->fd = fd;
618 return 0;
619 }
620
621 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
622 {
623 int trig;
624 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
625
626 switch (cmd) {
627 case VOICE_ENABLE:
628 {
629 va_list ap;
630 int poll_mode;
631
632 va_start (ap, cmd);
633 poll_mode = va_arg (ap, int);
634 va_end (ap);
635
636 ldebug ("enabling voice\n");
637 if (poll_mode && oss_poll_out (hw)) {
638 poll_mode = 0;
639 }
640 hw->poll_mode = poll_mode;
641
642 if (!oss->mmapped) {
643 return 0;
644 }
645
646 audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
647 trig = PCM_ENABLE_OUTPUT;
648 if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
649 oss_logerr (
650 errno,
651 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
652 );
653 return -1;
654 }
655 }
656 break;
657
658 case VOICE_DISABLE:
659 if (hw->poll_mode) {
660 qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
661 hw->poll_mode = 0;
662 }
663
664 if (!oss->mmapped) {
665 return 0;
666 }
667
668 ldebug ("disabling voice\n");
669 trig = 0;
670 if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
671 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
672 return -1;
673 }
674 break;
675 }
676 return 0;
677 }
678
679 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
680 {
681 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
682 struct oss_params req, obt;
683 int endianness;
684 int err;
685 int fd;
686 audfmt_e effective_fmt;
687 struct audsettings obt_as;
688
689 oss->fd = -1;
690
691 req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
692 req.freq = as->freq;
693 req.nchannels = as->nchannels;
694 req.fragsize = conf.fragsize;
695 req.nfrags = conf.nfrags;
696 if (oss_open (1, &req, &obt, &fd)) {
697 return -1;
698 }
699
700 err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
701 if (err) {
702 oss_anal_close (&fd);
703 return -1;
704 }
705
706 obt_as.freq = obt.freq;
707 obt_as.nchannels = obt.nchannels;
708 obt_as.fmt = effective_fmt;
709 obt_as.endianness = endianness;
710
711 audio_pcm_init_info (&hw->info, &obt_as);
712 oss->nfrags = obt.nfrags;
713 oss->fragsize = obt.fragsize;
714
715 if (obt.nfrags * obt.fragsize & hw->info.align) {
716 dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
717 obt.nfrags * obt.fragsize, hw->info.align + 1);
718 }
719
720 hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
721 oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
722 if (!oss->pcm_buf) {
723 dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
724 hw->samples, 1 << hw->info.shift);
725 oss_anal_close (&fd);
726 return -1;
727 }
728
729 oss->fd = fd;
730 return 0;
731 }
732
733 static void oss_fini_in (HWVoiceIn *hw)
734 {
735 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
736
737 oss_anal_close (&oss->fd);
738
739 if (oss->pcm_buf) {
740 g_free (oss->pcm_buf);
741 oss->pcm_buf = NULL;
742 }
743 }
744
745 static int oss_run_in (HWVoiceIn *hw)
746 {
747 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
748 int hwshift = hw->info.shift;
749 int i;
750 int live = audio_pcm_hw_get_live_in (hw);
751 int dead = hw->samples - live;
752 size_t read_samples = 0;
753 struct {
754 int add;
755 int len;
756 } bufs[2] = {
757 { .add = hw->wpos, .len = 0 },
758 { .add = 0, .len = 0 }
759 };
760
761 if (!dead) {
762 return 0;
763 }
764
765 if (hw->wpos + dead > hw->samples) {
766 bufs[0].len = (hw->samples - hw->wpos) << hwshift;
767 bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
768 }
769 else {
770 bufs[0].len = dead << hwshift;
771 }
772
773 for (i = 0; i < 2; ++i) {
774 ssize_t nread;
775
776 if (bufs[i].len) {
777 void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
778 nread = read (oss->fd, p, bufs[i].len);
779
780 if (nread > 0) {
781 if (nread & hw->info.align) {
782 dolog ("warning: Misaligned read %zd (requested %d), "
783 "alignment %d\n", nread, bufs[i].add << hwshift,
784 hw->info.align + 1);
785 }
786 read_samples += nread >> hwshift;
787 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift);
788 }
789
790 if (bufs[i].len - nread) {
791 if (nread == -1) {
792 switch (errno) {
793 case EINTR:
794 case EAGAIN:
795 break;
796 default:
797 oss_logerr (
798 errno,
799 "Failed to read %d bytes of audio (to %p)\n",
800 bufs[i].len, p
801 );
802 break;
803 }
804 }
805 break;
806 }
807 }
808 }
809
810 hw->wpos = (hw->wpos + read_samples) % hw->samples;
811 return read_samples;
812 }
813
814 static int oss_read (SWVoiceIn *sw, void *buf, int size)
815 {
816 return audio_pcm_sw_read (sw, buf, size);
817 }
818
819 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
820 {
821 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
822
823 switch (cmd) {
824 case VOICE_ENABLE:
825 {
826 va_list ap;
827 int poll_mode;
828
829 va_start (ap, cmd);
830 poll_mode = va_arg (ap, int);
831 va_end (ap);
832
833 if (poll_mode && oss_poll_in (hw)) {
834 poll_mode = 0;
835 }
836 hw->poll_mode = poll_mode;
837 }
838 break;
839
840 case VOICE_DISABLE:
841 if (hw->poll_mode) {
842 hw->poll_mode = 0;
843 qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
844 }
845 break;
846 }
847 return 0;
848 }
849
850 static void *oss_audio_init (void)
851 {
852 if (access(conf.devpath_in, R_OK | W_OK) < 0 ||
853 access(conf.devpath_out, R_OK | W_OK) < 0) {
854 return NULL;
855 }
856 return &conf;
857 }
858
859 static void oss_audio_fini (void *opaque)
860 {
861 (void) opaque;
862 }
863
864 static struct audio_option oss_options[] = {
865 {
866 .name = "FRAGSIZE",
867 .tag = AUD_OPT_INT,
868 .valp = &conf.fragsize,
869 .descr = "Fragment size in bytes"
870 },
871 {
872 .name = "NFRAGS",
873 .tag = AUD_OPT_INT,
874 .valp = &conf.nfrags,
875 .descr = "Number of fragments"
876 },
877 {
878 .name = "MMAP",
879 .tag = AUD_OPT_BOOL,
880 .valp = &conf.try_mmap,
881 .descr = "Try using memory mapped access"
882 },
883 {
884 .name = "DAC_DEV",
885 .tag = AUD_OPT_STR,
886 .valp = &conf.devpath_out,
887 .descr = "Path to DAC device"
888 },
889 {
890 .name = "ADC_DEV",
891 .tag = AUD_OPT_STR,
892 .valp = &conf.devpath_in,
893 .descr = "Path to ADC device"
894 },
895 {
896 .name = "EXCLUSIVE",
897 .tag = AUD_OPT_BOOL,
898 .valp = &conf.exclusive,
899 .descr = "Open device in exclusive mode (vmix wont work)"
900 },
901 #ifdef USE_DSP_POLICY
902 {
903 .name = "POLICY",
904 .tag = AUD_OPT_INT,
905 .valp = &conf.policy,
906 .descr = "Set the timing policy of the device, -1 to use fragment mode",
907 },
908 #endif
909 {
910 .name = "DEBUG",
911 .tag = AUD_OPT_BOOL,
912 .valp = &conf.debug,
913 .descr = "Turn on some debugging messages"
914 },
915 { /* End of list */ }
916 };
917
918 static struct audio_pcm_ops oss_pcm_ops = {
919 .init_out = oss_init_out,
920 .fini_out = oss_fini_out,
921 .run_out = oss_run_out,
922 .write = oss_write,
923 .ctl_out = oss_ctl_out,
924
925 .init_in = oss_init_in,
926 .fini_in = oss_fini_in,
927 .run_in = oss_run_in,
928 .read = oss_read,
929 .ctl_in = oss_ctl_in
930 };
931
932 struct audio_driver oss_audio_driver = {
933 .name = "oss",
934 .descr = "OSS http://www.opensound.com",
935 .options = oss_options,
936 .init = oss_audio_init,
937 .fini = oss_audio_fini,
938 .pcm_ops = &oss_pcm_ops,
939 .can_be_default = 1,
940 .max_voices_out = INT_MAX,
941 .max_voices_in = INT_MAX,
942 .voice_size_out = sizeof (OSSVoiceOut),
943 .voice_size_in = sizeof (OSSVoiceIn)
944 };