ossaudio.c@ 1

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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 <fcntl.h>
25	#include <errno.h>
26	#include <stdlib.h>
27	#include <unistd.h>
28	#include <sys/mman.h>
29	#include <sys/types.h>
30	#include <sys/ioctl.h>
31	#include <sys/soundcard.h>
32
33	#include "Builtins.h"
34	#include "../../vl_vbox.h"
35	#include "audio.h"
36	#include <iprt/alloc.h>
37
38	#define AUDIO_CAP "oss"
39	#include "audio_int.h"
40
41	typedef struct OSSVoiceOut {
42	HWVoiceOut hw;
43	void *pcm_buf;
44	int fd;
45	int nfrags;
46	int fragsize;
47	#ifndef __L4ENV__
48	int mmapped;
49	#endif
50	int old_optr;
51	} OSSVoiceOut;
52
53	typedef struct OSSVoiceIn {
54	HWVoiceIn hw;
55	void *pcm_buf;
56	int fd;
57	int nfrags;
58	int fragsize;
59	int old_optr;
60	} OSSVoiceIn;
61
62	static struct {
63	#ifndef __L4ENV__
64	int try_mmap;
65	#endif
66	int nfrags;
67	int fragsize;
68	const char *devpath_out;
69	const char *devpath_in;
70	int debug;
71	} conf = {
72	#ifndef __L4ENV__
73	INIT_FIELD (try_mmap =) 0,
74	#endif
75	INIT_FIELD (nfrags =) 4,
76	INIT_FIELD (fragsize =) 4096,
77	INIT_FIELD (devpath_out =) "/dev/dsp",
78	INIT_FIELD (devpath_in =) "/dev/dsp",
79	INIT_FIELD (debug =) 0,
80	};
81
82	struct oss_params {
83	int freq;
84	audfmt_e fmt;
85	int nchannels;
86	int nfrags;
87	int fragsize;
88	};
89
90	static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
91	{
92	va_list ap;
93
94	va_start (ap, fmt);
95	AUD_vlog (AUDIO_CAP, fmt, ap);
96	va_end (ap);
97
98	AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
99	}
100
101	static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
102	int err,
103	const char *typ,
104	const char *fmt,
105	...
106	)
107	{
108	va_list ap;
109
110	AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
111
112	va_start (ap, fmt);
113	AUD_vlog (AUDIO_CAP, fmt, ap);
114	va_end (ap);
115
116	AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
117	}
118
119	static void oss_anal_close (int *fdp)
120	{
121	int err = close (*fdp);
122	if (err) {
123	oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
124	}
125	*fdp = -1;
126	}
127
128	static int oss_write (SWVoiceOut sw, void buf, int len)
129	{
130	return audio_pcm_sw_write (sw, buf, len);
131	}
132
133	static int aud_to_ossfmt (audfmt_e fmt)
134	{
135	switch (fmt) {
136	case AUD_FMT_S8:
137	return AFMT_S8;
138
139	case AUD_FMT_U8:
140	return AFMT_U8;
141
142	case AUD_FMT_S16:
143	return AFMT_S16_LE;
144
145	case AUD_FMT_U16:
146	return AFMT_U16_LE;
147
148	default:
149	dolog ("Internal logic error: Bad audio format %d\n", fmt);
150	#ifdef DEBUG_AUDIO
151	abort ();
152	#endif
153	return AFMT_U8;
154	}
155	}
156
157	static int oss_to_audfmt (int ossfmt, audfmt_e fmt, int endianness)
158	{
159	switch (ossfmt) {
160	case AFMT_S8:
161	*endianness = 0;
162	*fmt = AUD_FMT_S8;
163	break;
164
165	case AFMT_U8:
166	*endianness = 0;
167	*fmt = AUD_FMT_U8;
168	break;
169
170	case AFMT_S16_LE:
171	*endianness = 0;
172	*fmt = AUD_FMT_S16;
173	break;
174
175	case AFMT_U16_LE:
176	*endianness = 0;
177	*fmt = AUD_FMT_U16;
178	break;
179
180	case AFMT_S16_BE:
181	*endianness = 1;
182	*fmt = AUD_FMT_S16;
183	break;
184
185	case AFMT_U16_BE:
186	*endianness = 1;
187	*fmt = AUD_FMT_U16;
188	break;
189
190	default:
191	dolog ("Unrecognized audio format %d\n", ossfmt);
192	return -1;
193	}
194
195	return 0;
196	}
197
198	#if defined DEBUG_MISMATCHES \|\| defined DEBUG
199	static void oss_dump_info (struct oss_params req, struct oss_params obt)
200	{
201	dolog ("parameter \| requested value \| obtained value\n");
202	dolog ("format \| %10d \| %10d\n", req->fmt, obt->fmt);
203	dolog ("channels \| %10d \| %10d\n",
204	req->nchannels, obt->nchannels);
205	dolog ("frequency \| %10d \| %10d\n", req->freq, obt->freq);
206	dolog ("nfrags \| %10d \| %10d\n", req->nfrags, obt->nfrags);
207	dolog ("fragsize \| %10d \| %10d\n",
208	req->fragsize, obt->fragsize);
209	}
210	#endif
211
212	static int oss_open (int in, struct oss_params *req,
213	struct oss_params obt, int pfd)
214	{
215	int fd;
216	int mmmmssss;
217	audio_buf_info abinfo;
218	int fmt, freq, nchannels;
219	const char *dspname = in ? conf.devpath_in : conf.devpath_out;
220	const char *typ = in ? "ADC" : "DAC";
221
222	fd = open (dspname, (in ? O_RDONLY : O_WRONLY) \| O_NONBLOCK);
223	if (-1 == fd) {
224	oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
225	LogRel(("Audio/OSS: Failed to open '%s' as %s\n", dspname, typ));
226	return -1;
227	}
228
229	freq = req->freq;
230	nchannels = req->nchannels;
231	fmt = req->fmt;
232
233	if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
234	oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
235	goto err;
236	}
237
238	if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
239	oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
240	req->nchannels);
241	goto err;
242	}
243
244	if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
245	oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
246	goto err;
247	}
248
249	if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
250	oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
251	goto err;
252	}
253
254	mmmmssss = (req->nfrags << 16) \| lsbindex (req->fragsize);
255	if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
256	oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
257	req->nfrags, req->fragsize);
258	goto err;
259	}
260
261	if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
262	oss_logerr2 (errno, typ, "Failed to get buffer length\n");
263	goto err;
264	}
265
266	obt->fmt = fmt;
267	obt->nchannels = nchannels;
268	obt->freq = freq;
269	obt->nfrags = abinfo.fragstotal;
270	obt->fragsize = abinfo.fragsize;
271	*pfd = fd;
272
273	#ifdef DEBUG_MISMATCHES
274	if ((req->fmt != obt->fmt) \|\|
275	(req->nchannels != obt->nchannels) \|\|
276	(req->freq != obt->freq) \|\|
277	(req->fragsize != obt->fragsize) \|\|
278	(req->nfrags != obt->nfrags)) {
279	dolog ("Audio parameters mismatch\n");
280	oss_dump_info (req, obt);
281	}
282	#endif
283
284	#ifdef DEBUG
285	oss_dump_info (req, obt);
286	#endif
287	return 0;
288
289	err:
290	oss_anal_close (&fd);
291	return -1;
292	}
293
294	static int oss_run_out (HWVoiceOut *hw)
295	{
296	OSSVoiceOut oss = (OSSVoiceOut ) hw;
297	int err, rpos, live, decr;
298	int samples;
299	uint8_t *dst;
300	st_sample_t *src;
301	struct audio_buf_info abinfo;
302	struct count_info cntinfo;
303	int bufsize;
304
305	live = audio_pcm_hw_get_live_out (hw);
306	if (!live) {
307	return 0;
308	}
309
310	bufsize = hw->samples << hw->info.shift;
311
312	#ifndef __L4ENV__
313	if (oss->mmapped) {
314	int bytes;
315
316	err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
317	if (err < 0) {
318	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
319	return 0;
320	}
321
322	if (cntinfo.ptr == oss->old_optr) {
323	if (abs (hw->samples - live) < 64) {
324	dolog ("warning: Overrun\n");
325	}
326	return 0;
327	}
328
329	if (cntinfo.ptr > oss->old_optr) {
330	bytes = cntinfo.ptr - oss->old_optr;
331	}
332	else {
333	bytes = bufsize + cntinfo.ptr - oss->old_optr;
334	}
335
336	decr = audio_MIN (bytes >> hw->info.shift, live);
337	}
338	else {
339	#endif
340	err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
341	if (err < 0) {
342	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
343	return 0;
344	}
345
346	if (abinfo.bytes > bufsize) {
347	if (conf.debug) {
348	dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
349	"please report your OS/audio hw to [email protected]\n",
350	abinfo.bytes, bufsize);
351	}
352	abinfo.bytes = bufsize;
353	}
354
355	if (abinfo.bytes < 0) {
356	if (conf.debug) {
357	dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
358	abinfo.bytes, bufsize);
359	}
360	return 0;
361	}
362
363	decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
364	if (!decr) {
365	return 0;
366	}
367	#ifndef __L4ENV__
368	}
369	#endif
370
371	samples = decr;
372	rpos = hw->rpos;
373	while (samples) {
374	int left_till_end_samples = hw->samples - rpos;
375	int convert_samples = audio_MIN (samples, left_till_end_samples);
376
377	src = hw->mix_buf + rpos;
378	dst = advance (oss->pcm_buf, rpos << hw->info.shift);
379
380	hw->clip (dst, src, convert_samples);
381	#ifdef __L4ENV__
382	{
383	#else
384	if (!oss->mmapped) {
385	#endif
386	int written;
387
388	written = write (oss->fd, dst, convert_samples << hw->info.shift);
389	/* XXX: follow errno recommendations ? */
390	if (written == -1) {
391	oss_logerr (
392	errno,
393	"Failed to write %d bytes of audio data from %p\n",
394	convert_samples << hw->info.shift,
395	dst
396	);
397	continue;
398	}
399
400	if (written != convert_samples << hw->info.shift) {
401	int wsamples = written >> hw->info.shift;
402	int wbytes = wsamples << hw->info.shift;
403	if (wbytes != written) {
404	dolog ("warning: Misaligned write %d (requested %d), "
405	"alignment %d\n",
406	wbytes, written, hw->info.align + 1);
407	}
408	#if 0
409	mixeng_sniff_and_clear (hw, src, dst, wsamples);
410	#endif
411	decr -= wsamples;
412	rpos = (rpos + wsamples) % hw->samples;
413	break;
414	}
415	}
416
417	#if 0
418	mixeng_sniff_and_clear (hw, src, dst, convert_samples);
419	#endif
420
421	rpos = (rpos + convert_samples) % hw->samples;
422	samples -= convert_samples;
423	}
424
425	#ifndef __L4ENV__
426	if (oss->mmapped) {
427	oss->old_optr = cntinfo.ptr;
428	}
429	#endif
430
431	hw->rpos = rpos;
432	return decr;
433	}
434
435	static void oss_fini_out (HWVoiceOut *hw)
436	{
437	int err;
438	OSSVoiceOut oss = (OSSVoiceOut ) hw;
439
440	ldebug ("oss_fini\n");
441	oss_anal_close (&oss->fd);
442
443	if (oss->pcm_buf) {
444	#ifdef __L4ENV__
445	qemu_free (oss->pcm_buf);
446	#else
447	if (oss->mmapped) {
448	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
449	if (err) {
450	oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
451	oss->pcm_buf, hw->samples << hw->info.shift);
452	}
453	}
454	else {
455	qemu_free (oss->pcm_buf);
456	}
457	#endif
458	oss->pcm_buf = NULL;
459	}
460	}
461
462	static int oss_init_out (HWVoiceOut hw, audsettings_t as)
463	{
464	OSSVoiceOut oss = (OSSVoiceOut ) hw;
465	struct oss_params req, obt;
466	int endianness;
467	int err;
468	int fd;
469	audfmt_e effective_fmt;
470	audsettings_t obt_as;
471
472	oss->fd = -1;
473
474	req.fmt = aud_to_ossfmt (as->fmt);
475	req.freq = as->freq;
476	req.nchannels = as->nchannels;
477	req.fragsize = conf.fragsize;
478	req.nfrags = conf.nfrags;
479
480	if (oss_open (0, &req, &obt, &fd)) {
481	return -1;
482	}
483
484	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
485	if (err) {
486	oss_anal_close (&fd);
487	return -1;
488	}
489
490	obt_as.freq = obt.freq;
491	obt_as.nchannels = obt.nchannels;
492	obt_as.fmt = effective_fmt;
493	obt_as.endianness = endianness;
494
495	audio_pcm_init_info (&hw->info, &obt_as);
496	oss->nfrags = obt.nfrags;
497	oss->fragsize = obt.fragsize;
498
499	if (obt.nfrags * obt.fragsize & hw->info.align) {
500	dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
501	obt.nfrags * obt.fragsize, hw->info.align + 1);
502	}
503
504	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
505
506	#ifndef __L4ENV__
507	oss->mmapped = 0;
508	if (conf.try_mmap) {
509	oss->pcm_buf = mmap (
510	0,
511	hw->samples << hw->info.shift,
512	PROT_READ \| PROT_WRITE,
513	MAP_SHARED,
514	fd,
515	0
516	);
517	if (oss->pcm_buf == MAP_FAILED) {
518	oss_logerr (errno, "Failed to map %d bytes of DAC\n",
519	hw->samples << hw->info.shift);
520	} else {
521	int err;
522	int trig = 0;
523	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
524	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
525	}
526	else {
527	trig = PCM_ENABLE_OUTPUT;
528	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
529	oss_logerr (
530	errno,
531	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
532	);
533	}
534	else {
535	oss->mmapped = 1;
536	}
537	}
538
539	if (!oss->mmapped) {
540	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
541	if (err) {
542	oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
543	oss->pcm_buf, hw->samples << hw->info.shift);
544	}
545	}
546	}
547	}
548	#endif
549
550	#ifndef __L4ENV__
551	if (!oss->mmapped) {
552	#endif
553	oss->pcm_buf = audio_calloc (
554	AUDIO_FUNC,
555	hw->samples,
556	1 << hw->info.shift
557	);
558	if (!oss->pcm_buf) {
559	dolog (
560	"Could not allocate DAC buffer (%d samples, each %d bytes)\n",
561	hw->samples,
562	1 << hw->info.shift
563	);
564	oss_anal_close (&fd);
565	return -1;
566	}
567	#ifndef __L4ENV__
568	}
569	#endif
570
571	oss->fd = fd;
572	return 0;
573	}
574
575	static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
576	{
577	int trig;
578	OSSVoiceOut oss = (OSSVoiceOut ) hw;
579
580	#ifdef __L4ENV__
581	return 0;
582	#else
583	if (!oss->mmapped) {
584	return 0;
585	}
586	#endif
587
588	switch (cmd) {
589	case VOICE_ENABLE:
590	ldebug ("enabling voice\n");
591	audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
592	trig = PCM_ENABLE_OUTPUT;
593	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
594	oss_logerr (
595	errno,
596	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
597	);
598	return -1;
599	}
600	break;
601
602	case VOICE_DISABLE:
603	ldebug ("disabling voice\n");
604	trig = 0;
605	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
606	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
607	return -1;
608	}
609	break;
610	}
611	return 0;
612	}
613
614	static int oss_init_in (HWVoiceIn hw, audsettings_t as)
615	{
616	OSSVoiceIn oss = (OSSVoiceIn ) hw;
617	struct oss_params req, obt;
618	int endianness;
619	int err;
620	int fd;
621	audfmt_e effective_fmt;
622	audsettings_t obt_as;
623
624	oss->fd = -1;
625
626	req.fmt = aud_to_ossfmt (as->fmt);
627	req.freq = as->freq;
628	req.nchannels = as->nchannels;
629	req.fragsize = conf.fragsize;
630	req.nfrags = conf.nfrags;
631	if (oss_open (1, &req, &obt, &fd)) {
632	return -1;
633	}
634
635	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
636	if (err) {
637	oss_anal_close (&fd);
638	return -1;
639	}
640
641	obt_as.freq = obt.freq;
642	obt_as.nchannels = obt.nchannels;
643	obt_as.fmt = effective_fmt;
644	obt_as.endianness = endianness;
645
646	audio_pcm_init_info (&hw->info, &obt_as);
647	oss->nfrags = obt.nfrags;
648	oss->fragsize = obt.fragsize;
649
650	if (obt.nfrags * obt.fragsize & hw->info.align) {
651	dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
652	obt.nfrags * obt.fragsize, hw->info.align + 1);
653	}
654
655	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
656	oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
657	if (!oss->pcm_buf) {
658	dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
659	hw->samples, 1 << hw->info.shift);
660	oss_anal_close (&fd);
661	return -1;
662	}
663
664	oss->fd = fd;
665	return 0;
666	}
667
668	static void oss_fini_in (HWVoiceIn *hw)
669	{
670	OSSVoiceIn oss = (OSSVoiceIn ) hw;
671
672	oss_anal_close (&oss->fd);
673
674	if (oss->pcm_buf) {
675	qemu_free (oss->pcm_buf);
676	oss->pcm_buf = NULL;
677	}
678	}
679
680	static int oss_run_in (HWVoiceIn *hw)
681	{
682	OSSVoiceIn oss = (OSSVoiceIn ) hw;
683	int hwshift = hw->info.shift;
684	int i;
685	int live = audio_pcm_hw_get_live_in (hw);
686	int dead = hw->samples - live;
687	size_t read_samples = 0;
688	struct {
689	int add;
690	int len;
691	} bufs[2];
692
693	bufs[0].add = hw->wpos;
694	bufs[0].len = 0;
695	bufs[1].add = 0;
696	bufs[1].len = 0;
697
698	if (!dead) {
699	return 0;
700	}
701
702	if (hw->wpos + dead > hw->samples) {
703	bufs[0].len = (hw->samples - hw->wpos) << hwshift;
704	bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
705	}
706	else {
707	bufs[0].len = dead << hwshift;
708	}
709
710
711	for (i = 0; i < 2; ++i) {
712	ssize_t nread;
713
714	if (bufs[i].len) {
715	void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
716	nread = read (oss->fd, p, bufs[i].len);
717
718	if (nread > 0) {
719	if (nread & hw->info.align) {
720	dolog ("warning: Misaligned read %"
721	FMTZ "d (requested %d), "
722	"alignment %d\n", nread, bufs[i].add << hwshift,
723	hw->info.align + 1);
724	}
725	read_samples += nread >> hwshift;
726	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
727	&nominal_volume);
728	}
729
730	if (bufs[i].len - nread) {
731	if (nread == -1) {
732	switch (errno) {
733	case EINTR:
734	case EAGAIN:
735	break;
736	default:
737	oss_logerr (
738	errno,
739	"Failed to read %d bytes of audio (to %p)\n",
740	bufs[i].len, p
741	);
742	break;
743	}
744	}
745	break;
746	}
747	}
748	}
749
750	hw->wpos = (hw->wpos + read_samples) % hw->samples;
751	return read_samples;
752	}
753
754	static int oss_read (SWVoiceIn sw, void buf, int size)
755	{
756	return audio_pcm_sw_read (sw, buf, size);
757	}
758
759	static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
760	{
761	(void) hw;
762	(void) cmd;
763	return 0;
764	}
765
766	static void *oss_audio_init (void)
767	{
768	return &conf;
769	}
770
771	static void oss_audio_fini (void *opaque)
772	{
773	(void) opaque;
774	}
775
776	static struct audio_option oss_options[] = {
777	{"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
778	"Fragment size in bytes", NULL, 0},
779	{"NFRAGS", AUD_OPT_INT, &conf.nfrags,
780	"Number of fragments", NULL, 0},
781	#ifndef __L4ENV__
782	{"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
783	"Try using memory mapped access", NULL, 0},
784	#endif
785	{"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
786	"Path to DAC device", NULL, 0},
787	{"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
788	"Path to ADC device", NULL, 0},
789	{"DEBUG", AUD_OPT_BOOL, &conf.debug,
790	"Turn on some debugging messages", NULL, 0},
791	{NULL, 0, NULL, NULL, NULL, 0}
792	};
793
794	static struct audio_pcm_ops oss_pcm_ops = {
795	oss_init_out,
796	oss_fini_out,
797	oss_run_out,
798	oss_write,
799	oss_ctl_out,
800
801	oss_init_in,
802	oss_fini_in,
803	oss_run_in,
804	oss_read,
805	oss_ctl_in
806	};
807
808	struct audio_driver oss_audio_driver = {
809	INIT_FIELD (name = ) "oss",
810	INIT_FIELD (descr = ) "OSS http://www.opensound.com",
811	INIT_FIELD (options = ) oss_options,
812	INIT_FIELD (init = ) oss_audio_init,
813	INIT_FIELD (fini = ) oss_audio_fini,
814	INIT_FIELD (pcm_ops = ) &oss_pcm_ops,
815	INIT_FIELD (can_be_default = ) 1,
816	INIT_FIELD (max_voices_out = ) INT_MAX,
817	INIT_FIELD (max_voices_in = ) INT_MAX,
818	INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
819	INIT_FIELD (voice_size_in = ) sizeof (OSSVoiceIn)
820	};

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source: vbox/trunk/src/VBox/Devices/Audio/ossaudio.c@ 1

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