ossaudio.c@ 566

Last change on this file since 566 was 366, checked in by vboxsync, 18 years ago
made mixing of pcm_in work
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 22.4 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 [email protected]\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	#ifndef VBOX
786	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
787	&nominal_volume);
788	#else
789	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
790	&pcm_in_volume);
791	#endif
792	}
793
794	if (bufs[i].len - nread) {
795	if (nread == -1) {
796	switch (errno) {
797	case EINTR:
798	case EAGAIN:
799	break;
800	default:
801	oss_logerr (
802	errno,
803	"Failed to read %d bytes of audio (to %p)\n",
804	bufs[i].len, p
805	);
806	break;
807	}
808	}
809	break;
810	}
811	}
812	}
813
814	hw->wpos = (hw->wpos + read_samples) % hw->samples;
815	return read_samples;
816	}
817
818	static int oss_read (SWVoiceIn sw, void buf, int size)
819	{
820	return audio_pcm_sw_read (sw, buf, size);
821	}
822
823	static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
824	{
825	(void) hw;
826	(void) cmd;
827	return 0;
828	}
829
830	static void *oss_audio_init (void)
831	{
832	return &conf;
833	}
834
835	static void oss_audio_fini (void *opaque)
836	{
837	(void) opaque;
838	}
839
840	static struct audio_option oss_options[] = {
841	{"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
842	"Fragment size in bytes", NULL, 0},
843	{"NFRAGS", AUD_OPT_INT, &conf.nfrags,
844	"Number of fragments", NULL, 0},
845	#ifndef __L4ENV__
846	{"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
847	"Try using memory mapped access", NULL, 0},
848	#endif
849	{"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
850	"Path to DAC device", NULL, 0},
851	{"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
852	"Path to ADC device", NULL, 0},
853	{"DEBUG", AUD_OPT_BOOL, &conf.debug,
854	"Turn on some debugging messages", NULL, 0},
855	{NULL, 0, NULL, NULL, NULL, 0}
856	};
857
858	static struct audio_pcm_ops oss_pcm_ops = {
859	oss_init_out,
860	oss_fini_out,
861	oss_run_out,
862	oss_write,
863	oss_ctl_out,
864
865	oss_init_in,
866	oss_fini_in,
867	oss_run_in,
868	oss_read,
869	oss_ctl_in
870	};
871
872	struct audio_driver oss_audio_driver = {
873	INIT_FIELD (name = ) "oss",
874	INIT_FIELD (descr = ) "OSS http://www.opensound.com",
875	INIT_FIELD (options = ) oss_options,
876	INIT_FIELD (init = ) oss_audio_init,
877	INIT_FIELD (fini = ) oss_audio_fini,
878	INIT_FIELD (pcm_ops = ) &oss_pcm_ops,
879	INIT_FIELD (can_be_default = ) 1,
880	INIT_FIELD (max_voices_out = ) INT_MAX,
881	INIT_FIELD (max_voices_in = ) INT_MAX,
882	INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
883	INIT_FIELD (voice_size_in = ) sizeof (OSSVoiceIn)
884	};

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source: vbox/trunk/src/VBox/Devices/Audio/ossaudio.c@ 566

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