ossaudio.c@ 356

Last change on this file since 356 was 356, checked in by vboxsync, 18 years ago
some more detailed LogRel about the reason why opening an OSS audio device failed
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 22.2 KB

Line
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	#ifndef VBOX
102	static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
103	int err,
104	const char *typ,
105	const char *fmt,
106	...
107	)
108	{
109	va_list ap;
110
111	AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
112
113	va_start (ap, fmt);
114	AUD_vlog (AUDIO_CAP, fmt, ap);
115	va_end (ap);
116
117	AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
118	}
119	#endif
120
121	static void oss_anal_close (int *fdp)
122	{
123	int err = close (*fdp);
124	if (err) {
125	oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
126	}
127	*fdp = -1;
128	}
129
130	static int oss_write (SWVoiceOut sw, void buf, int len)
131	{
132	return audio_pcm_sw_write (sw, buf, len);
133	}
134
135	static int aud_to_ossfmt (audfmt_e fmt)
136	{
137	switch (fmt) {
138	case AUD_FMT_S8:
139	return AFMT_S8;
140
141	case AUD_FMT_U8:
142	return AFMT_U8;
143
144	case AUD_FMT_S16:
145	return AFMT_S16_LE;
146
147	case AUD_FMT_U16:
148	return AFMT_U16_LE;
149
150	default:
151	dolog ("Internal logic error: Bad audio format %d\n", fmt);
152	#ifdef DEBUG_AUDIO
153	abort ();
154	#endif
155	return AFMT_U8;
156	}
157	}
158
159	static int oss_to_audfmt (int ossfmt, audfmt_e fmt, int endianness)
160	{
161	switch (ossfmt) {
162	case AFMT_S8:
163	*endianness = 0;
164	*fmt = AUD_FMT_S8;
165	break;
166
167	case AFMT_U8:
168	*endianness = 0;
169	*fmt = AUD_FMT_U8;
170	break;
171
172	case AFMT_S16_LE:
173	*endianness = 0;
174	*fmt = AUD_FMT_S16;
175	break;
176
177	case AFMT_U16_LE:
178	*endianness = 0;
179	*fmt = AUD_FMT_U16;
180	break;
181
182	case AFMT_S16_BE:
183	*endianness = 1;
184	*fmt = AUD_FMT_S16;
185	break;
186
187	case AFMT_U16_BE:
188	*endianness = 1;
189	*fmt = AUD_FMT_U16;
190	break;
191
192	default:
193	dolog ("Unrecognized audio format %d\n", ossfmt);
194	return -1;
195	}
196
197	return 0;
198	}
199
200	#if defined DEBUG_MISMATCHES \|\| defined DEBUG
201	static void oss_dump_info (struct oss_params req, struct oss_params obt)
202	{
203	dolog ("parameter \| requested value \| obtained value\n");
204	dolog ("format \| %10d \| %10d\n", req->fmt, obt->fmt);
205	dolog ("channels \| %10d \| %10d\n",
206	req->nchannels, obt->nchannels);
207	dolog ("frequency \| %10d \| %10d\n", req->freq, obt->freq);
208	dolog ("nfrags \| %10d \| %10d\n", req->nfrags, obt->nfrags);
209	dolog ("fragsize \| %10d \| %10d\n",
210	req->fragsize, obt->fragsize);
211	}
212	#endif
213
214	static int oss_open (int in, struct oss_params *req,
215	struct oss_params obt, int pfd)
216	{
217	int fd;
218	int mmmmssss;
219	audio_buf_info abinfo;
220	int fmt, freq, nchannels;
221	const char *dspname = in ? conf.devpath_in : conf.devpath_out;
222	const char *typ = in ? "ADC" : "DAC";
223
224	fd = open (dspname, (in ? O_RDONLY : O_WRONLY) \| O_NONBLOCK);
225	if (-1 == fd) {
226	#ifndef VBOX
227	oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
228	#else
229	LogRel(("Audio/OSS: Failed to open %s for %s (%s)\n",
230	dspname, typ, strerror(errno)));
231	#endif
232	return -1;
233	}
234
235	#ifdef VBOX
236	LogRel(("Audio/OSS: Successfully opened %s for %s\n", dspname, typ));
237	#endif
238
239	freq = req->freq;
240	nchannels = req->nchannels;
241	fmt = req->fmt;
242
243	if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
244	#ifndef VBOX
245	oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
246	#else
247	LogRel(("Audio/OSS: Failed to set sample size %d (%s)\n",
248	req->fmt, strerror(errno)));
249	#endif
250	goto err;
251	}
252
253	if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
254	#ifndef VBOX
255	oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
256	req->nchannels);
257	#else
258	LogRel(("Audio/OSS: Failed to set nchannels=%d (%s)\n",
259	req->nchannels, strerror(errno)));
260	#endif
261	goto err;
262	}
263
264	if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
265	#ifndef VBOX
266	oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
267	#else
268	LogRel(("Audio/OSS: Failed to set freq=%dHZ\n", req->freq, strerror(errno)));
269	#endif
270	goto err;
271	}
272
273	if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
274	#ifndef VBOX
275	oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
276	#else
277	LogRel(("Audio/OSS: Failed to set non-blocking mode (%s)\n", strerror(errno)));
278	#endif
279	goto err;
280	}
281
282	mmmmssss = (req->nfrags << 16) \| lsbindex (req->fragsize);
283	if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
284	#ifndef VBOX
285	oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
286	req->nfrags, req->fragsize);
287	#else
288	LogRel(("Audio/OSS: Failed to set buffer_length=%d,%d (%s)\n",
289	req->nfrags, req->fragsize, strerror(errno)));
290	#endif
291	goto err;
292	}
293
294	if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
295	#ifndef VBOX
296	oss_logerr2 (errno, typ, "Failed to get buffer length\n");
297	#else
298	LogRel(("Audio/OSS: Failed to get buffer length (%s)\n", strerror(errno)));
299	#endif
300	goto err;
301	}
302
303	obt->fmt = fmt;
304	obt->nchannels = nchannels;
305	obt->freq = freq;
306	obt->nfrags = abinfo.fragstotal;
307	obt->fragsize = abinfo.fragsize;
308	*pfd = fd;
309
310	#ifdef DEBUG_MISMATCHES
311	if ((req->fmt != obt->fmt) \|\|
312	(req->nchannels != obt->nchannels) \|\|
313	(req->freq != obt->freq) \|\|
314	(req->fragsize != obt->fragsize) \|\|
315	(req->nfrags != obt->nfrags)) {
316	dolog ("Audio parameters mismatch\n");
317	oss_dump_info (req, obt);
318	}
319	#endif
320
321	#ifdef DEBUG
322	oss_dump_info (req, obt);
323	#endif
324	return 0;
325
326	err:
327	oss_anal_close (&fd);
328	#ifdef VBOX
329	LogRel(("Audio/OSS: Closed %s for %s\n",
330	in ? conf.devpath_in : conf.devpath_out, in ? "ADC" : "DAC"));
331	#endif
332	return -1;
333	}
334
335	static int oss_run_out (HWVoiceOut *hw)
336	{
337	OSSVoiceOut oss = (OSSVoiceOut ) hw;
338	int err, rpos, live, decr;
339	int samples;
340	uint8_t *dst;
341	st_sample_t *src;
342	struct audio_buf_info abinfo;
343	struct count_info cntinfo;
344	int bufsize;
345
346	live = audio_pcm_hw_get_live_out (hw);
347	if (!live) {
348	return 0;
349	}
350
351	bufsize = hw->samples << hw->info.shift;
352
353	#ifndef __L4ENV__
354	if (oss->mmapped) {
355	int bytes;
356
357	err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
358	if (err < 0) {
359	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
360	return 0;
361	}
362
363	if (cntinfo.ptr == oss->old_optr) {
364	if (abs (hw->samples - live) < 64) {
365	dolog ("warning: Overrun\n");
366	}
367	return 0;
368	}
369
370	if (cntinfo.ptr > oss->old_optr) {
371	bytes = cntinfo.ptr - oss->old_optr;
372	}
373	else {
374	bytes = bufsize + cntinfo.ptr - oss->old_optr;
375	}
376
377	decr = audio_MIN (bytes >> hw->info.shift, live);
378	}
379	else {
380	#endif
381	err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
382	if (err < 0) {
383	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
384	return 0;
385	}
386
387	if (abinfo.bytes > bufsize) {
388	if (conf.debug) {
389	dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
390	"please report your OS/audio hw to malc@pulsesoft.com\n",
391	abinfo.bytes, bufsize);
392	}
393	abinfo.bytes = bufsize;
394	}
395
396	if (abinfo.bytes < 0) {
397	if (conf.debug) {
398	dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
399	abinfo.bytes, bufsize);
400	}
401	return 0;
402	}
403
404	decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
405	if (!decr) {
406	return 0;
407	}
408	#ifndef __L4ENV__
409	}
410	#endif
411
412	samples = decr;
413	rpos = hw->rpos;
414	while (samples) {
415	int left_till_end_samples = hw->samples - rpos;
416	int convert_samples = audio_MIN (samples, left_till_end_samples);
417
418	src = hw->mix_buf + rpos;
419	dst = advance (oss->pcm_buf, rpos << hw->info.shift);
420
421	hw->clip (dst, src, convert_samples);
422	#ifdef __L4ENV__
423	{
424	#else
425	if (!oss->mmapped) {
426	#endif
427	int written;
428
429	written = write (oss->fd, dst, convert_samples << hw->info.shift);
430	/* XXX: follow errno recommendations ? */
431	if (written == -1) {
432	oss_logerr (
433	errno,
434	"Failed to write %d bytes of audio data from %p\n",
435	convert_samples << hw->info.shift,
436	dst
437	);
438	continue;
439	}
440
441	if (written != convert_samples << hw->info.shift) {
442	int wsamples = written >> hw->info.shift;
443	int wbytes = wsamples << hw->info.shift;
444	if (wbytes != written) {
445	dolog ("warning: Misaligned write %d (requested %d), "
446	"alignment %d\n",
447	wbytes, written, hw->info.align + 1);
448	}
449	#if 0
450	mixeng_sniff_and_clear (hw, src, dst, wsamples);
451	#endif
452	decr -= wsamples;
453	rpos = (rpos + wsamples) % hw->samples;
454	break;
455	}
456	}
457
458	#if 0
459	mixeng_sniff_and_clear (hw, src, dst, convert_samples);
460	#endif
461
462	rpos = (rpos + convert_samples) % hw->samples;
463	samples -= convert_samples;
464	}
465
466	#ifndef __L4ENV__
467	if (oss->mmapped) {
468	oss->old_optr = cntinfo.ptr;
469	}
470	#endif
471
472	hw->rpos = rpos;
473	return decr;
474	}
475
476	static void oss_fini_out (HWVoiceOut *hw)
477	{
478	int err;
479	OSSVoiceOut oss = (OSSVoiceOut ) hw;
480
481	ldebug ("oss_fini\n");
482	oss_anal_close (&oss->fd);
483	#ifdef VBOX
484	LogRel(("Audio/OSS: Closed %s for DAC\n", conf.devpath_out));
485	#endif
486
487	if (oss->pcm_buf) {
488	#ifdef __L4ENV__
489	qemu_free (oss->pcm_buf);
490	#else
491	if (oss->mmapped) {
492	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
493	if (err) {
494	oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
495	oss->pcm_buf, hw->samples << hw->info.shift);
496	}
497	}
498	else {
499	qemu_free (oss->pcm_buf);
500	}
501	#endif
502	oss->pcm_buf = NULL;
503	}
504	}
505
506	static int oss_init_out (HWVoiceOut hw, audsettings_t as)
507	{
508	OSSVoiceOut oss = (OSSVoiceOut ) hw;
509	struct oss_params req, obt;
510	int endianness;
511	int err;
512	int fd;
513	audfmt_e effective_fmt;
514	audsettings_t obt_as;
515
516	oss->fd = -1;
517
518	req.fmt = aud_to_ossfmt (as->fmt);
519	req.freq = as->freq;
520	req.nchannels = as->nchannels;
521	req.fragsize = conf.fragsize;
522	req.nfrags = conf.nfrags;
523
524	if (oss_open (0, &req, &obt, &fd)) {
525	return -1;
526	}
527
528	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
529	if (err) {
530	oss_anal_close (&fd);
531	#ifdef VBOX
532	LogRel(("Audio/OSS: Closed %s for DAC\n", conf.devpath_out));
533	#endif
534	return -1;
535	}
536
537	obt_as.freq = obt.freq;
538	obt_as.nchannels = obt.nchannels;
539	obt_as.fmt = effective_fmt;
540	obt_as.endianness = endianness;
541
542	audio_pcm_init_info (&hw->info, &obt_as);
543	oss->nfrags = obt.nfrags;
544	oss->fragsize = obt.fragsize;
545
546	if (obt.nfrags * obt.fragsize & hw->info.align) {
547	dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
548	obt.nfrags * obt.fragsize, hw->info.align + 1);
549	}
550
551	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
552
553	#ifndef __L4ENV__
554	oss->mmapped = 0;
555	if (conf.try_mmap) {
556	oss->pcm_buf = mmap (
557	0,
558	hw->samples << hw->info.shift,
559	PROT_READ \| PROT_WRITE,
560	MAP_SHARED,
561	fd,
562	0
563	);
564	if (oss->pcm_buf == MAP_FAILED) {
565	oss_logerr (errno, "Failed to map %d bytes of DAC\n",
566	hw->samples << hw->info.shift);
567	} else {
568	int err;
569	int trig = 0;
570	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
571	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
572	}
573	else {
574	trig = PCM_ENABLE_OUTPUT;
575	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
576	oss_logerr (
577	errno,
578	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
579	);
580	}
581	else {
582	oss->mmapped = 1;
583	}
584	}
585
586	if (!oss->mmapped) {
587	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
588	if (err) {
589	oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
590	oss->pcm_buf, hw->samples << hw->info.shift);
591	}
592	}
593	}
594	}
595	#endif
596
597	#ifndef __L4ENV__
598	if (!oss->mmapped) {
599	#endif
600	oss->pcm_buf = audio_calloc (
601	AUDIO_FUNC,
602	hw->samples,
603	1 << hw->info.shift
604	);
605	if (!oss->pcm_buf) {
606	dolog (
607	"Could not allocate DAC buffer (%d samples, each %d bytes)\n",
608	hw->samples,
609	1 << hw->info.shift
610	);
611	oss_anal_close (&fd);
612	#ifdef VBOX
613	LogRel(("Audio/OSS: Closed %s for DAC\n", conf.devpath_out));
614	#endif
615	return -1;
616	}
617	#ifndef __L4ENV__
618	}
619	#endif
620
621	oss->fd = fd;
622	return 0;
623	}
624
625	static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
626	{
627	int trig;
628	OSSVoiceOut oss = (OSSVoiceOut ) hw;
629
630	#ifdef __L4ENV__
631	return 0;
632	#else
633	if (!oss->mmapped) {
634	return 0;
635	}
636	#endif
637
638	switch (cmd) {
639	case VOICE_ENABLE:
640	ldebug ("enabling voice\n");
641	audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
642	trig = PCM_ENABLE_OUTPUT;
643	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
644	oss_logerr (
645	errno,
646	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
647	);
648	return -1;
649	}
650	break;
651
652	case VOICE_DISABLE:
653	ldebug ("disabling voice\n");
654	trig = 0;
655	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
656	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
657	return -1;
658	}
659	break;
660	}
661	return 0;
662	}
663
664	static int oss_init_in (HWVoiceIn hw, audsettings_t as)
665	{
666	OSSVoiceIn oss = (OSSVoiceIn ) hw;
667	struct oss_params req, obt;
668	int endianness;
669	int err;
670	int fd;
671	audfmt_e effective_fmt;
672	audsettings_t obt_as;
673
674	oss->fd = -1;
675
676	req.fmt = aud_to_ossfmt (as->fmt);
677	req.freq = as->freq;
678	req.nchannels = as->nchannels;
679	req.fragsize = conf.fragsize;
680	req.nfrags = conf.nfrags;
681	if (oss_open (1, &req, &obt, &fd)) {
682	return -1;
683	}
684
685	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
686	if (err) {
687	oss_anal_close (&fd);
688	#ifdef VBOX
689	LogRel(("Audio/OSS: Closed %s for ADC\n", conf.devpath_in));
690	#endif
691	return -1;
692	}
693
694	obt_as.freq = obt.freq;
695	obt_as.nchannels = obt.nchannels;
696	obt_as.fmt = effective_fmt;
697	obt_as.endianness = endianness;
698
699	audio_pcm_init_info (&hw->info, &obt_as);
700	oss->nfrags = obt.nfrags;
701	oss->fragsize = obt.fragsize;
702
703	if (obt.nfrags * obt.fragsize & hw->info.align) {
704	dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
705	obt.nfrags * obt.fragsize, hw->info.align + 1);
706	}
707
708	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
709	oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
710	if (!oss->pcm_buf) {
711	dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
712	hw->samples, 1 << hw->info.shift);
713	oss_anal_close (&fd);
714	#ifdef VBOX
715	LogRel(("Audio/OSS: Closed %s for ADC\n", conf.devpath_in));
716	#endif
717	return -1;
718	}
719
720	oss->fd = fd;
721	return 0;
722	}
723
724	static void oss_fini_in (HWVoiceIn *hw)
725	{
726	OSSVoiceIn oss = (OSSVoiceIn ) hw;
727
728	oss_anal_close (&oss->fd);
729	#ifdef VBOX
730	LogRel(("Audio/OSS: Closed %s for ADC\n", conf.devpath_in));
731	#endif
732
733	if (oss->pcm_buf) {
734	qemu_free (oss->pcm_buf);
735	oss->pcm_buf = NULL;
736	}
737	}
738
739	static int oss_run_in (HWVoiceIn *hw)
740	{
741	OSSVoiceIn oss = (OSSVoiceIn ) hw;
742	int hwshift = hw->info.shift;
743	int i;
744	int live = audio_pcm_hw_get_live_in (hw);
745	int dead = hw->samples - live;
746	size_t read_samples = 0;
747	struct {
748	int add;
749	int len;
750	} bufs[2];
751
752	bufs[0].add = hw->wpos;
753	bufs[0].len = 0;
754	bufs[1].add = 0;
755	bufs[1].len = 0;
756
757	if (!dead) {
758	return 0;
759	}
760
761	if (hw->wpos + dead > hw->samples) {
762	bufs[0].len = (hw->samples - hw->wpos) << hwshift;
763	bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
764	}
765	else {
766	bufs[0].len = dead << hwshift;
767	}
768
769
770	for (i = 0; i < 2; ++i) {
771	ssize_t nread;
772
773	if (bufs[i].len) {
774	void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
775	nread = read (oss->fd, p, bufs[i].len);
776
777	if (nread > 0) {
778	if (nread & hw->info.align) {
779	dolog ("warning: Misaligned read %"
780	FMTZ "d (requested %d), "
781	"alignment %d\n", nread, bufs[i].add << hwshift,
782	hw->info.align + 1);
783	}
784	read_samples += nread >> hwshift;
785	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
786	&nominal_volume);
787	}
788
789	if (bufs[i].len - nread) {
790	if (nread == -1) {
791	switch (errno) {
792	case EINTR:
793	case EAGAIN:
794	break;
795	default:
796	oss_logerr (
797	errno,
798	"Failed to read %d bytes of audio (to %p)\n",
799	bufs[i].len, p
800	);
801	break;
802	}
803	}
804	break;
805	}
806	}
807	}
808
809	hw->wpos = (hw->wpos + read_samples) % hw->samples;
810	return read_samples;
811	}
812
813	static int oss_read (SWVoiceIn sw, void buf, int size)
814	{
815	return audio_pcm_sw_read (sw, buf, size);
816	}
817
818	static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
819	{
820	(void) hw;
821	(void) cmd;
822	return 0;
823	}
824
825	static void *oss_audio_init (void)
826	{
827	return &conf;
828	}
829
830	static void oss_audio_fini (void *opaque)
831	{
832	(void) opaque;
833	}
834
835	static struct audio_option oss_options[] = {
836	{"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
837	"Fragment size in bytes", NULL, 0},
838	{"NFRAGS", AUD_OPT_INT, &conf.nfrags,
839	"Number of fragments", NULL, 0},
840	#ifndef __L4ENV__
841	{"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
842	"Try using memory mapped access", NULL, 0},
843	#endif
844	{"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
845	"Path to DAC device", NULL, 0},
846	{"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
847	"Path to ADC device", NULL, 0},
848	{"DEBUG", AUD_OPT_BOOL, &conf.debug,
849	"Turn on some debugging messages", NULL, 0},
850	{NULL, 0, NULL, NULL, NULL, 0}
851	};
852
853	static struct audio_pcm_ops oss_pcm_ops = {
854	oss_init_out,
855	oss_fini_out,
856	oss_run_out,
857	oss_write,
858	oss_ctl_out,
859
860	oss_init_in,
861	oss_fini_in,
862	oss_run_in,
863	oss_read,
864	oss_ctl_in
865	};
866
867	struct audio_driver oss_audio_driver = {
868	INIT_FIELD (name = ) "oss",
869	INIT_FIELD (descr = ) "OSS http://www.opensound.com",
870	INIT_FIELD (options = ) oss_options,
871	INIT_FIELD (init = ) oss_audio_init,
872	INIT_FIELD (fini = ) oss_audio_fini,
873	INIT_FIELD (pcm_ops = ) &oss_pcm_ops,
874	INIT_FIELD (can_be_default = ) 1,
875	INIT_FIELD (max_voices_out = ) INT_MAX,
876	INIT_FIELD (max_voices_in = ) INT_MAX,
877	INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
878	INIT_FIELD (voice_size_in = ) sizeof (OSSVoiceIn)
879	};

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source: vbox/trunk/src/VBox/Devices/Audio/ossaudio.c@ 356

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