ossaudio.c@ 5085

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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	#ifdef VBOX
25	#define LOG_GROUP LOG_GROUP_DEV_AUDIO
26	#include <VBox/log.h>
27	#endif
28	#include <fcntl.h>
29	#include <errno.h>
30	#include <stdlib.h>
31	#include <unistd.h>
32	#include <sys/mman.h>
33	#include <sys/types.h>
34	#include <sys/ioctl.h>
35	#include <sys/soundcard.h>
36
37	#include "Builtins.h"
38	#include "../../vl_vbox.h"
39	#include "audio.h"
40	#include <iprt/alloc.h>
41
42	#define AUDIO_CAP "oss"
43	#include "audio_int.h"
44
45	typedef struct OSSVoiceOut {
46	HWVoiceOut hw;
47	void *pcm_buf;
48	int fd;
49	int nfrags;
50	int fragsize;
51	#ifndef RT_OS_L4
52	int mmapped;
53	#endif
54	int old_optr;
55	} OSSVoiceOut;
56
57	typedef struct OSSVoiceIn {
58	HWVoiceIn hw;
59	void *pcm_buf;
60	int fd;
61	int nfrags;
62	int fragsize;
63	int old_optr;
64	} OSSVoiceIn;
65
66	static struct {
67	#ifndef RT_OS_L4
68	int try_mmap;
69	#endif
70	int nfrags;
71	int fragsize;
72	const char *devpath_out;
73	const char *devpath_in;
74	int debug;
75	} conf = {
76	#ifndef RT_OS_L4
77	INIT_FIELD (try_mmap =) 0,
78	#endif
79	INIT_FIELD (nfrags =) 4,
80	INIT_FIELD (fragsize =) 4096,
81	INIT_FIELD (devpath_out =) "/dev/dsp",
82	INIT_FIELD (devpath_in =) "/dev/dsp",
83	INIT_FIELD (debug =) 0,
84	};
85
86	struct oss_params {
87	int freq;
88	audfmt_e fmt;
89	int nchannels;
90	int nfrags;
91	int fragsize;
92	};
93
94	static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
95	{
96	va_list ap;
97
98	va_start (ap, fmt);
99	AUD_vlog (AUDIO_CAP, fmt, ap);
100	va_end (ap);
101
102	AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
103	}
104
105	#ifndef VBOX
106	static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
107	int err,
108	const char *typ,
109	const char *fmt,
110	...
111	)
112	{
113	va_list ap;
114
115	AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
116
117	va_start (ap, fmt);
118	AUD_vlog (AUDIO_CAP, fmt, ap);
119	va_end (ap);
120
121	AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
122	}
123	#endif
124
125	static void oss_anal_close (int *fdp)
126	{
127	int err = close (*fdp);
128	if (err) {
129	oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
130	}
131	*fdp = -1;
132	}
133
134	static int oss_write (SWVoiceOut sw, void buf, int len)
135	{
136	return audio_pcm_sw_write (sw, buf, len);
137	}
138
139	static int aud_to_ossfmt (audfmt_e fmt)
140	{
141	switch (fmt) {
142	case AUD_FMT_S8:
143	return AFMT_S8;
144
145	case AUD_FMT_U8:
146	return AFMT_U8;
147
148	case AUD_FMT_S16:
149	return AFMT_S16_LE;
150
151	case AUD_FMT_U16:
152	return AFMT_U16_LE;
153
154	default:
155	dolog ("Internal logic error: Bad audio format %d\n", fmt);
156	#ifdef DEBUG_AUDIO
157	abort ();
158	#endif
159	return AFMT_U8;
160	}
161	}
162
163	static int oss_to_audfmt (int ossfmt, audfmt_e fmt, int endianness)
164	{
165	switch (ossfmt) {
166	case AFMT_S8:
167	*endianness = 0;
168	*fmt = AUD_FMT_S8;
169	break;
170
171	case AFMT_U8:
172	*endianness = 0;
173	*fmt = AUD_FMT_U8;
174	break;
175
176	case AFMT_S16_LE:
177	*endianness = 0;
178	*fmt = AUD_FMT_S16;
179	break;
180
181	case AFMT_U16_LE:
182	*endianness = 0;
183	*fmt = AUD_FMT_U16;
184	break;
185
186	case AFMT_S16_BE:
187	*endianness = 1;
188	*fmt = AUD_FMT_S16;
189	break;
190
191	case AFMT_U16_BE:
192	*endianness = 1;
193	*fmt = AUD_FMT_U16;
194	break;
195
196	default:
197	dolog ("Unrecognized audio format %d\n", ossfmt);
198	return -1;
199	}
200
201	return 0;
202	}
203
204	#if defined DEBUG_MISMATCHES \|\| defined DEBUG
205	static void oss_dump_info (struct oss_params req, struct oss_params obt)
206	{
207	dolog ("parameter \| requested value \| obtained value\n");
208	dolog ("format \| %10d \| %10d\n", req->fmt, obt->fmt);
209	dolog ("channels \| %10d \| %10d\n",
210	req->nchannels, obt->nchannels);
211	dolog ("frequency \| %10d \| %10d\n", req->freq, obt->freq);
212	dolog ("nfrags \| %10d \| %10d\n", req->nfrags, obt->nfrags);
213	dolog ("fragsize \| %10d \| %10d\n",
214	req->fragsize, obt->fragsize);
215	}
216	#endif
217
218	static int oss_open (int in, struct oss_params *req,
219	struct oss_params obt, int pfd)
220	{
221	int fd;
222	int mmmmssss;
223	audio_buf_info abinfo;
224	int fmt, freq, nchannels;
225	const char *dspname = in ? conf.devpath_in : conf.devpath_out;
226	const char *typ = in ? "ADC" : "DAC";
227
228	fd = open (dspname, (in ? O_RDONLY : O_WRONLY) \| O_NONBLOCK);
229	if (-1 == fd) {
230	#ifndef VBOX
231	oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
232	#else
233	LogRel(("OSS: Failed to open %s for %s (%s)\n",
234	dspname, typ, strerror(errno)));
235	#endif
236	return -1;
237	}
238
239	#ifdef VBOX
240	LogRel(("OSS: Successfully opened %s for %s\n", dspname, typ));
241	#endif
242
243	freq = req->freq;
244	nchannels = req->nchannels;
245	fmt = req->fmt;
246
247	if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
248	#ifndef VBOX
249	oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
250	#else
251	LogRel(("OSS: Failed to set sample size %d (%s)\n",
252	req->fmt, strerror(errno)));
253	#endif
254	goto err;
255	}
256
257	if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
258	#ifndef VBOX
259	oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
260	req->nchannels);
261	#else
262	LogRel(("OSS: Failed to set nchannels=%d (%s)\n",
263	req->nchannels, strerror(errno)));
264	#endif
265	goto err;
266	}
267
268	if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
269	#ifndef VBOX
270	oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
271	#else
272	LogRel(("OSS: Failed to set freq=%dHZ\n", req->freq, strerror(errno)));
273	#endif
274	goto err;
275	}
276
277	if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
278	#ifndef VBOX
279	oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
280	#else
281	LogRel(("OSS: Failed to set non-blocking mode (%s)\n", strerror(errno)));
282	#endif
283	goto err;
284	}
285
286	mmmmssss = (req->nfrags << 16) \| lsbindex (req->fragsize);
287	if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
288	#ifndef VBOX
289	oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
290	req->nfrags, req->fragsize);
291	#else
292	LogRel(("OSS: Failed to set buffer_length=%d,%d (%s)\n",
293	req->nfrags, req->fragsize, strerror(errno)));
294	#endif
295	goto err;
296	}
297
298	if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
299	#ifndef VBOX
300	oss_logerr2 (errno, typ, "Failed to get buffer length\n");
301	#else
302	LogRel(("OSS: Failed to get buffer length (%s)\n", strerror(errno)));
303	#endif
304	goto err;
305	}
306
307	obt->fmt = fmt;
308	obt->nchannels = nchannels;
309	obt->freq = freq;
310	obt->nfrags = abinfo.fragstotal;
311	obt->fragsize = abinfo.fragsize;
312	*pfd = fd;
313
314	#ifdef DEBUG_MISMATCHES
315	if ((req->fmt != obt->fmt) \|\|
316	(req->nchannels != obt->nchannels) \|\|
317	(req->freq != obt->freq) \|\|
318	(req->fragsize != obt->fragsize) \|\|
319	(req->nfrags != obt->nfrags)) {
320	dolog ("Audio parameters mismatch\n");
321	oss_dump_info (req, obt);
322	}
323	#endif
324
325	#ifdef DEBUG
326	oss_dump_info (req, obt);
327	#endif
328	return 0;
329
330	err:
331	oss_anal_close (&fd);
332	#ifdef VBOX
333	LogRel(("OSS: Closed %s for %s\n",
334	in ? conf.devpath_in : conf.devpath_out, in ? "ADC" : "DAC"));
335	#endif
336	return -1;
337	}
338
339	static int oss_run_out (HWVoiceOut *hw)
340	{
341	OSSVoiceOut oss = (OSSVoiceOut ) hw;
342	int err, rpos, live, decr;
343	int samples;
344	uint8_t *dst;
345	st_sample_t *src;
346	struct audio_buf_info abinfo;
347	#ifndef RT_OS_L4
348	struct count_info cntinfo;
349	#endif
350	int bufsize;
351
352	live = audio_pcm_hw_get_live_out (hw);
353	if (!live) {
354	return 0;
355	}
356
357	bufsize = hw->samples << hw->info.shift;
358
359	#ifndef RT_OS_L4
360	if (oss->mmapped) {
361	int bytes;
362
363	err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
364	if (err < 0) {
365	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
366	return 0;
367	}
368
369	if (cntinfo.ptr == oss->old_optr) {
370	if (abs (hw->samples - live) < 64) {
371	dolog ("warning: Overrun\n");
372	}
373	return 0;
374	}
375
376	if (cntinfo.ptr > oss->old_optr) {
377	bytes = cntinfo.ptr - oss->old_optr;
378	}
379	else {
380	bytes = bufsize + cntinfo.ptr - oss->old_optr;
381	}
382
383	decr = audio_MIN (bytes >> hw->info.shift, live);
384	}
385	else {
386	#endif
387	err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
388	if (err < 0) {
389	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
390	return 0;
391	}
392
393	if (abinfo.bytes > bufsize) {
394	if (conf.debug) {
395	dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
396	"please report your OS/audio hw to malc@pulsesoft.com\n",
397	abinfo.bytes, bufsize);
398	}
399	abinfo.bytes = bufsize;
400	}
401
402	if (abinfo.bytes < 0) {
403	if (conf.debug) {
404	dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
405	abinfo.bytes, bufsize);
406	}
407	return 0;
408	}
409
410	decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
411	if (!decr) {
412	return 0;
413	}
414	#ifndef RT_OS_L4
415	}
416	#endif
417
418	samples = decr;
419	rpos = hw->rpos;
420	while (samples) {
421	int left_till_end_samples = hw->samples - rpos;
422	int convert_samples = audio_MIN (samples, left_till_end_samples);
423
424	src = hw->mix_buf + rpos;
425	dst = advance (oss->pcm_buf, rpos << hw->info.shift);
426
427	hw->clip (dst, src, convert_samples);
428	#ifdef RT_OS_L4
429	{
430	#else
431	if (!oss->mmapped) {
432	#endif
433	int written;
434
435	written = write (oss->fd, dst, convert_samples << hw->info.shift);
436	/* XXX: follow errno recommendations ? */
437	if (written == -1) {
438	oss_logerr (
439	errno,
440	"Failed to write %d bytes of audio data from %p\n",
441	convert_samples << hw->info.shift,
442	dst
443	);
444	continue;
445	}
446
447	if (written != convert_samples << hw->info.shift) {
448	int wsamples = written >> hw->info.shift;
449	int wbytes = wsamples << hw->info.shift;
450	if (wbytes != written) {
451	dolog ("warning: Misaligned write %d (requested %d), "
452	"alignment %d\n",
453	wbytes, written, hw->info.align + 1);
454	}
455	#if 0
456	mixeng_sniff_and_clear (hw, src, dst, wsamples);
457	#endif
458	decr -= wsamples;
459	rpos = (rpos + wsamples) % hw->samples;
460	break;
461	}
462	}
463
464	#if 0
465	mixeng_sniff_and_clear (hw, src, dst, convert_samples);
466	#endif
467
468	rpos = (rpos + convert_samples) % hw->samples;
469	samples -= convert_samples;
470	}
471
472	#ifndef RT_OS_L4
473	if (oss->mmapped) {
474	oss->old_optr = cntinfo.ptr;
475	}
476	#endif
477
478	hw->rpos = rpos;
479	return decr;
480	}
481
482	static void oss_fini_out (HWVoiceOut *hw)
483	{
484	#ifndef RT_OS_L4
485	int err;
486	#endif
487	OSSVoiceOut oss = (OSSVoiceOut ) hw;
488
489	ldebug ("oss_fini\n");
490	oss_anal_close (&oss->fd);
491	#ifdef VBOX
492	LogRel(("OSS: Closed %s for DAC\n", conf.devpath_out));
493	#endif
494
495	if (oss->pcm_buf) {
496	#ifdef RT_OS_L4
497	qemu_free (oss->pcm_buf);
498	#else
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	qemu_free (oss->pcm_buf);
508	}
509	#endif
510	oss->pcm_buf = NULL;
511	}
512	}
513
514	static int oss_init_out (HWVoiceOut hw, audsettings_t as)
515	{
516	OSSVoiceOut oss = (OSSVoiceOut ) hw;
517	struct oss_params req, obt;
518	int endianness;
519	int err;
520	int fd;
521	audfmt_e effective_fmt;
522	audsettings_t obt_as;
523
524	oss->fd = -1;
525
526	req.fmt = aud_to_ossfmt (as->fmt);
527	req.freq = as->freq;
528	req.nchannels = as->nchannels;
529	req.fragsize = conf.fragsize;
530	req.nfrags = conf.nfrags;
531
532	if (oss_open (0, &req, &obt, &fd)) {
533	return -1;
534	}
535
536	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
537	if (err) {
538	oss_anal_close (&fd);
539	#ifdef VBOX
540	LogRel(("OSS: Closed %s for DAC\n", conf.devpath_out));
541	#endif
542	return -1;
543	}
544
545	obt_as.freq = obt.freq;
546	obt_as.nchannels = obt.nchannels;
547	obt_as.fmt = effective_fmt;
548	obt_as.endianness = endianness;
549
550	audio_pcm_init_info (&hw->info, &obt_as);
551	oss->nfrags = obt.nfrags;
552	oss->fragsize = obt.fragsize;
553
554	if (obt.nfrags * obt.fragsize & hw->info.align) {
555	dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
556	obt.nfrags * obt.fragsize, hw->info.align + 1);
557	}
558
559	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
560
561	#ifndef RT_OS_L4
562	oss->mmapped = 0;
563	if (conf.try_mmap) {
564	oss->pcm_buf = mmap (
565	0,
566	hw->samples << hw->info.shift,
567	PROT_READ \| PROT_WRITE,
568	MAP_SHARED,
569	fd,
570	0
571	);
572	if (oss->pcm_buf == MAP_FAILED) {
573	oss_logerr (errno, "Failed to map %d bytes of DAC\n",
574	hw->samples << hw->info.shift);
575	} else {
576	int err;
577	int trig = 0;
578	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
579	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
580	}
581	else {
582	trig = PCM_ENABLE_OUTPUT;
583	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
584	oss_logerr (
585	errno,
586	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
587	);
588	}
589	else {
590	oss->mmapped = 1;
591	}
592	}
593
594	if (!oss->mmapped) {
595	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
596	if (err) {
597	oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
598	oss->pcm_buf, hw->samples << hw->info.shift);
599	}
600	}
601	}
602	}
603	#endif
604
605	#ifndef RT_OS_L4
606	if (!oss->mmapped) {
607	#endif
608	oss->pcm_buf = audio_calloc (
609	AUDIO_FUNC,
610	hw->samples,
611	1 << hw->info.shift
612	);
613	if (!oss->pcm_buf) {
614	dolog (
615	"Could not allocate DAC buffer (%d samples, each %d bytes)\n",
616	hw->samples,
617	1 << hw->info.shift
618	);
619	oss_anal_close (&fd);
620	#ifdef VBOX
621	LogRel(("OSS: Closed %s for DAC\n", conf.devpath_out));
622	#endif
623	return -1;
624	}
625	#ifndef RT_OS_L4
626	}
627	#endif
628
629	oss->fd = fd;
630	return 0;
631	}
632
633	static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
634	{
635	int trig;
636	OSSVoiceOut oss = (OSSVoiceOut ) hw;
637
638	#ifdef RT_OS_L4
639	return 0;
640	#else
641	if (!oss->mmapped) {
642	return 0;
643	}
644	#endif
645
646	switch (cmd) {
647	case VOICE_ENABLE:
648	ldebug ("enabling voice\n");
649	audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
650	trig = PCM_ENABLE_OUTPUT;
651	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
652	oss_logerr (
653	errno,
654	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
655	);
656	return -1;
657	}
658	break;
659
660	case VOICE_DISABLE:
661	ldebug ("disabling voice\n");
662	trig = 0;
663	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
664	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
665	return -1;
666	}
667	break;
668	}
669	return 0;
670	}
671
672	static int oss_init_in (HWVoiceIn hw, audsettings_t as)
673	{
674	OSSVoiceIn oss = (OSSVoiceIn ) hw;
675	struct oss_params req, obt;
676	int endianness;
677	int err;
678	int fd;
679	audfmt_e effective_fmt;
680	audsettings_t obt_as;
681
682	oss->fd = -1;
683
684	req.fmt = aud_to_ossfmt (as->fmt);
685	req.freq = as->freq;
686	req.nchannels = as->nchannels;
687	req.fragsize = conf.fragsize;
688	req.nfrags = conf.nfrags;
689	if (oss_open (1, &req, &obt, &fd)) {
690	return -1;
691	}
692
693	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
694	if (err) {
695	oss_anal_close (&fd);
696	#ifdef VBOX
697	LogRel(("OSS: Closed %s for ADC\n", conf.devpath_in));
698	#endif
699	return -1;
700	}
701
702	obt_as.freq = obt.freq;
703	obt_as.nchannels = obt.nchannels;
704	obt_as.fmt = effective_fmt;
705	obt_as.endianness = endianness;
706
707	audio_pcm_init_info (&hw->info, &obt_as);
708	oss->nfrags = obt.nfrags;
709	oss->fragsize = obt.fragsize;
710
711	if (obt.nfrags * obt.fragsize & hw->info.align) {
712	dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
713	obt.nfrags * obt.fragsize, hw->info.align + 1);
714	}
715
716	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
717	oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
718	if (!oss->pcm_buf) {
719	dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
720	hw->samples, 1 << hw->info.shift);
721	oss_anal_close (&fd);
722	#ifdef VBOX
723	LogRel(("OSS: Closed %s for ADC\n", conf.devpath_in));
724	#endif
725	return -1;
726	}
727
728	oss->fd = fd;
729	return 0;
730	}
731
732	static void oss_fini_in (HWVoiceIn *hw)
733	{
734	OSSVoiceIn oss = (OSSVoiceIn ) hw;
735
736	oss_anal_close (&oss->fd);
737	#ifdef VBOX
738	LogRel(("OSS: Closed %s for ADC\n", conf.devpath_in));
739	#endif
740
741	if (oss->pcm_buf) {
742	qemu_free (oss->pcm_buf);
743	oss->pcm_buf = NULL;
744	}
745	}
746
747	static int oss_run_in (HWVoiceIn *hw)
748	{
749	OSSVoiceIn oss = (OSSVoiceIn ) hw;
750	int hwshift = hw->info.shift;
751	int i;
752	int live = audio_pcm_hw_get_live_in (hw);
753	int dead = hw->samples - live;
754	size_t read_samples = 0;
755	struct {
756	int add;
757	int len;
758	} bufs[2];
759
760	bufs[0].add = hw->wpos;
761	bufs[0].len = 0;
762	bufs[1].add = 0;
763	bufs[1].len = 0;
764
765	if (!dead) {
766	return 0;
767	}
768
769	if (hw->wpos + dead > hw->samples) {
770	bufs[0].len = (hw->samples - hw->wpos) << hwshift;
771	bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
772	}
773	else {
774	bufs[0].len = dead << hwshift;
775	}
776
777
778	for (i = 0; i < 2; ++i) {
779	ssize_t nread;
780
781	if (bufs[i].len) {
782	void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
783	nread = read (oss->fd, p, bufs[i].len);
784
785	if (nread > 0) {
786	if (nread & hw->info.align) {
787	dolog ("warning: Misaligned read %"
788	FMTZ "d (requested %d), "
789	"alignment %d\n", nread, bufs[i].add << hwshift,
790	hw->info.align + 1);
791	}
792	read_samples += nread >> hwshift;
793	#ifndef VBOX
794	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
795	&nominal_volume);
796	#else
797	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
798	&pcm_in_volume);
799	#endif
800	}
801
802	if (bufs[i].len - nread) {
803	if (nread == -1) {
804	switch (errno) {
805	case EINTR:
806	case EAGAIN:
807	break;
808	default:
809	oss_logerr (
810	errno,
811	"Failed to read %d bytes of audio (to %p)\n",
812	bufs[i].len, p
813	);
814	break;
815	}
816	}
817	break;
818	}
819	}
820	}
821
822	hw->wpos = (hw->wpos + read_samples) % hw->samples;
823	return read_samples;
824	}
825
826	static int oss_read (SWVoiceIn sw, void buf, int size)
827	{
828	return audio_pcm_sw_read (sw, buf, size);
829	}
830
831	static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
832	{
833	(void) hw;
834	(void) cmd;
835	return 0;
836	}
837
838	static void *oss_audio_init (void)
839	{
840	return &conf;
841	}
842
843	static void oss_audio_fini (void *opaque)
844	{
845	(void) opaque;
846	}
847
848	static struct audio_option oss_options[] = {
849	{"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
850	"Fragment size in bytes", NULL, 0},
851	{"NFRAGS", AUD_OPT_INT, &conf.nfrags,
852	"Number of fragments", NULL, 0},
853	#ifndef RT_OS_L4
854	{"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
855	"Try using memory mapped access", NULL, 0},
856	#endif
857	{"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
858	"Path to DAC device", NULL, 0},
859	{"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
860	"Path to ADC device", NULL, 0},
861	{"DEBUG", AUD_OPT_BOOL, &conf.debug,
862	"Turn on some debugging messages", NULL, 0},
863	{NULL, 0, NULL, NULL, NULL, 0}
864	};
865
866	static struct audio_pcm_ops oss_pcm_ops = {
867	oss_init_out,
868	oss_fini_out,
869	oss_run_out,
870	oss_write,
871	oss_ctl_out,
872
873	oss_init_in,
874	oss_fini_in,
875	oss_run_in,
876	oss_read,
877	oss_ctl_in
878	};
879
880	struct audio_driver oss_audio_driver = {
881	INIT_FIELD (name = ) "oss",
882	INIT_FIELD (descr = ) "OSS http://www.opensound.com",
883	INIT_FIELD (options = ) oss_options,
884	INIT_FIELD (init = ) oss_audio_init,
885	INIT_FIELD (fini = ) oss_audio_fini,
886	INIT_FIELD (pcm_ops = ) &oss_pcm_ops,
887	INIT_FIELD (can_be_default = ) 1,
888	INIT_FIELD (max_voices_out = ) INT_MAX,
889	INIT_FIELD (max_voices_in = ) INT_MAX,
890	INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
891	INIT_FIELD (voice_size_in = ) sizeof (OSSVoiceIn)
892	};

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source: vbox/trunk/src/VBox/Devices/Audio/ossaudio.c@ 5085

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