ossaudio.c@ 38905

最後變更在這個檔案從38905是 35353,由 vboxsync 提交於 14 年前
Move the misc files the in src/VBox/Devices/ directory into a build/ subdirectory, changing their names to match the target module.
屬性 svn:eol-style 設為 `native` 屬性 svn:keywords 設為 `Author Date Id Revision`
檔案大小: 22.5 KB

行
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 "VBoxDD.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	/* Obsolete on Solaris (using O_NONBLOCK is sufficient) */
278	#if !(defined(VBOX) && defined(RT_OS_SOLARIS))
279	if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
280	# ifndef VBOX
281	oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
282	# else
283	LogRel(("OSS: Failed to set non-blocking mode (%s)\n", strerror(errno)));
284	# endif
285	goto err;
286	}
287	#endif
288
289	mmmmssss = (req->nfrags << 16) \| lsbindex (req->fragsize);
290	if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
291	#ifndef VBOX
292	oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
293	req->nfrags, req->fragsize);
294	#else
295	LogRel(("OSS: Failed to set buffer_length=%d,%d (%s)\n",
296	req->nfrags, req->fragsize, strerror(errno)));
297	#endif
298	goto err;
299	}
300
301	if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
302	#ifndef VBOX
303	oss_logerr2 (errno, typ, "Failed to get buffer length\n");
304	#else
305	LogRel(("OSS: Failed to get buffer length (%s)\n", strerror(errno)));
306	#endif
307	goto err;
308	}
309
310	obt->fmt = fmt;
311	obt->nchannels = nchannels;
312	obt->freq = freq;
313	obt->nfrags = abinfo.fragstotal;
314	obt->fragsize = abinfo.fragsize;
315	*pfd = fd;
316
317	#ifdef DEBUG_MISMATCHES
318	if ((req->fmt != obt->fmt) \|\|
319	(req->nchannels != obt->nchannels) \|\|
320	(req->freq != obt->freq) \|\|
321	(req->fragsize != obt->fragsize) \|\|
322	(req->nfrags != obt->nfrags)) {
323	dolog ("Audio parameters mismatch\n");
324	oss_dump_info (req, obt);
325	}
326	#endif
327
328	#ifdef DEBUG
329	oss_dump_info (req, obt);
330	#endif
331	return 0;
332
333	err:
334	oss_anal_close (&fd);
335	#ifdef VBOX
336	LogRel(("OSS: Closed %s for %s\n",
337	in ? conf.devpath_in : conf.devpath_out, in ? "ADC" : "DAC"));
338	#endif
339	return -1;
340	}
341
342	static int oss_run_out (HWVoiceOut *hw)
343	{
344	OSSVoiceOut oss = (OSSVoiceOut ) hw;
345	int err, rpos, live, decr;
346	int samples;
347	uint8_t *dst;
348	st_sample_t *src;
349	struct audio_buf_info abinfo;
350	#ifndef RT_OS_L4
351	struct count_info cntinfo;
352	#endif
353	int bufsize;
354
355	live = audio_pcm_hw_get_live_out (hw);
356	if (!live) {
357	return 0;
358	}
359
360	bufsize = hw->samples << hw->info.shift;
361
362	#ifndef RT_OS_L4
363	if (oss->mmapped) {
364	int bytes;
365
366	err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
367	if (err < 0) {
368	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
369	return 0;
370	}
371
372	if (cntinfo.ptr == oss->old_optr) {
373	if (abs (hw->samples - live) < 64) {
374	dolog ("warning: Overrun\n");
375	}
376	return 0;
377	}
378
379	if (cntinfo.ptr > oss->old_optr) {
380	bytes = cntinfo.ptr - oss->old_optr;
381	}
382	else {
383	bytes = bufsize + cntinfo.ptr - oss->old_optr;
384	}
385
386	decr = audio_MIN (bytes >> hw->info.shift, live);
387	}
388	else {
389	#endif
390	err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
391	if (err < 0) {
392	oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
393	return 0;
394	}
395
396	if (abinfo.bytes > bufsize) {
397	if (conf.debug) {
398	dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
399	"please report your OS/audio hw to [email protected]\n",
400	abinfo.bytes, bufsize);
401	}
402	abinfo.bytes = bufsize;
403	}
404
405	if (abinfo.bytes < 0) {
406	if (conf.debug) {
407	dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
408	abinfo.bytes, bufsize);
409	}
410	return 0;
411	}
412
413	decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
414	if (!decr) {
415	return 0;
416	}
417	#ifndef RT_OS_L4
418	}
419	#endif
420
421	samples = decr;
422	rpos = hw->rpos;
423	while (samples) {
424	int left_till_end_samples = hw->samples - rpos;
425	int convert_samples = audio_MIN (samples, left_till_end_samples);
426
427	src = hw->mix_buf + rpos;
428	dst = advance (oss->pcm_buf, rpos << hw->info.shift);
429
430	hw->clip (dst, src, convert_samples);
431	#ifdef RT_OS_L4
432	{
433	#else
434	if (!oss->mmapped) {
435	#endif
436	int written;
437
438	written = write (oss->fd, dst, convert_samples << hw->info.shift);
439	/* XXX: follow errno recommendations ? */
440	if (written == -1) {
441	oss_logerr (
442	errno,
443	"Failed to write %d bytes of audio data from %p\n",
444	convert_samples << hw->info.shift,
445	dst
446	);
447	continue;
448	}
449
450	if (written != convert_samples << hw->info.shift) {
451	int wsamples = written >> hw->info.shift;
452	int wbytes = wsamples << hw->info.shift;
453	if (wbytes != written) {
454	dolog ("warning: Misaligned write %d (requested %d), "
455	"alignment %d\n",
456	wbytes, written, hw->info.align + 1);
457	}
458	#if 0
459	mixeng_sniff_and_clear (hw, src, dst, wsamples);
460	#endif
461	decr -= wsamples;
462	rpos = (rpos + wsamples) % hw->samples;
463	break;
464	}
465	}
466
467	#if 0
468	mixeng_sniff_and_clear (hw, src, dst, convert_samples);
469	#endif
470
471	rpos = (rpos + convert_samples) % hw->samples;
472	samples -= convert_samples;
473	}
474
475	#ifndef RT_OS_L4
476	if (oss->mmapped) {
477	oss->old_optr = cntinfo.ptr;
478	}
479	#endif
480
481	hw->rpos = rpos;
482	return decr;
483	}
484
485	static void oss_fini_out (HWVoiceOut *hw)
486	{
487	#ifndef RT_OS_L4
488	int err;
489	#endif
490	OSSVoiceOut oss = (OSSVoiceOut ) hw;
491
492	ldebug ("oss_fini\n");
493	oss_anal_close (&oss->fd);
494	#ifdef VBOX
495	LogRel(("OSS: Closed %s for DAC\n", conf.devpath_out));
496	#endif
497
498	if (oss->pcm_buf) {
499	#ifdef RT_OS_L4
500	qemu_free (oss->pcm_buf);
501	#else
502	if (oss->mmapped) {
503	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
504	if (err) {
505	oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
506	oss->pcm_buf, hw->samples << hw->info.shift);
507	}
508	}
509	else {
510	qemu_free (oss->pcm_buf);
511	}
512	#endif
513	oss->pcm_buf = NULL;
514	}
515	}
516
517	static int oss_init_out (HWVoiceOut hw, audsettings_t as)
518	{
519	OSSVoiceOut oss = (OSSVoiceOut ) hw;
520	struct oss_params req, obt;
521	int endianness;
522	int err;
523	int fd;
524	audfmt_e effective_fmt;
525	audsettings_t obt_as;
526
527	oss->fd = -1;
528
529	req.fmt = aud_to_ossfmt (as->fmt);
530	req.freq = as->freq;
531	req.nchannels = as->nchannels;
532	req.fragsize = conf.fragsize;
533	req.nfrags = conf.nfrags;
534
535	if (oss_open (0, &req, &obt, &fd)) {
536	return -1;
537	}
538
539	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
540	if (err) {
541	oss_anal_close (&fd);
542	#ifdef VBOX
543	LogRel(("OSS: Closed %s for DAC\n", conf.devpath_out));
544	#endif
545	return -1;
546	}
547
548	obt_as.freq = obt.freq;
549	obt_as.nchannels = obt.nchannels;
550	obt_as.fmt = effective_fmt;
551	obt_as.endianness = endianness;
552
553	audio_pcm_init_info (&hw->info, &obt_as);
554	oss->nfrags = obt.nfrags;
555	oss->fragsize = obt.fragsize;
556
557	if (obt.nfrags * obt.fragsize & hw->info.align) {
558	dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
559	obt.nfrags * obt.fragsize, hw->info.align + 1);
560	}
561
562	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
563
564	#ifndef RT_OS_L4
565	oss->mmapped = 0;
566	if (conf.try_mmap) {
567	oss->pcm_buf = mmap (
568	0,
569	hw->samples << hw->info.shift,
570	PROT_READ \| PROT_WRITE,
571	MAP_SHARED,
572	fd,
573	0
574	);
575	if (oss->pcm_buf == MAP_FAILED) {
576	oss_logerr (errno, "Failed to map %d bytes of DAC\n",
577	hw->samples << hw->info.shift);
578	} else {
579	# ifndef VBOX /* -Wshadow */
580	int err;
581	# endif
582	int trig = 0;
583	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
584	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
585	}
586	else {
587	trig = PCM_ENABLE_OUTPUT;
588	if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
589	oss_logerr (
590	errno,
591	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
592	);
593	}
594	else {
595	oss->mmapped = 1;
596	}
597	}
598
599	if (!oss->mmapped) {
600	err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
601	if (err) {
602	oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
603	oss->pcm_buf, hw->samples << hw->info.shift);
604	}
605	}
606	}
607	}
608	#endif
609
610	#ifndef RT_OS_L4
611	if (!oss->mmapped) {
612	#endif
613	oss->pcm_buf = audio_calloc (
614	AUDIO_FUNC,
615	hw->samples,
616	1 << hw->info.shift
617	);
618	if (!oss->pcm_buf) {
619	dolog (
620	"Could not allocate DAC buffer (%d samples, each %d bytes)\n",
621	hw->samples,
622	1 << hw->info.shift
623	);
624	oss_anal_close (&fd);
625	#ifdef VBOX
626	LogRel(("OSS: Closed %s for DAC\n", conf.devpath_out));
627	#endif
628	return -1;
629	}
630	#ifndef RT_OS_L4
631	}
632	#endif
633
634	oss->fd = fd;
635	return 0;
636	}
637
638	static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
639	{
640	int trig;
641	OSSVoiceOut oss = (OSSVoiceOut ) hw;
642
643	#ifdef RT_OS_L4
644	return 0;
645	#else
646	if (!oss->mmapped) {
647	return 0;
648	}
649	#endif
650
651	switch (cmd) {
652	case VOICE_ENABLE:
653	ldebug ("enabling voice\n");
654	audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
655	trig = PCM_ENABLE_OUTPUT;
656	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
657	oss_logerr (
658	errno,
659	"SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
660	);
661	return -1;
662	}
663	break;
664
665	case VOICE_DISABLE:
666	ldebug ("disabling voice\n");
667	trig = 0;
668	if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
669	oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
670	return -1;
671	}
672	break;
673	}
674	return 0;
675	}
676
677	static int oss_init_in (HWVoiceIn hw, audsettings_t as)
678	{
679	OSSVoiceIn oss = (OSSVoiceIn ) hw;
680	struct oss_params req, obt;
681	int endianness;
682	int err;
683	int fd;
684	audfmt_e effective_fmt;
685	audsettings_t obt_as;
686
687	oss->fd = -1;
688
689	req.fmt = aud_to_ossfmt (as->fmt);
690	req.freq = as->freq;
691	req.nchannels = as->nchannels;
692	req.fragsize = conf.fragsize;
693	req.nfrags = conf.nfrags;
694	if (oss_open (1, &req, &obt, &fd)) {
695	return -1;
696	}
697
698	err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
699	if (err) {
700	oss_anal_close (&fd);
701	#ifdef VBOX
702	LogRel(("OSS: Closed %s for ADC\n", conf.devpath_in));
703	#endif
704	return -1;
705	}
706
707	obt_as.freq = obt.freq;
708	obt_as.nchannels = obt.nchannels;
709	obt_as.fmt = effective_fmt;
710	obt_as.endianness = endianness;
711
712	audio_pcm_init_info (&hw->info, &obt_as);
713	oss->nfrags = obt.nfrags;
714	oss->fragsize = obt.fragsize;
715
716	if (obt.nfrags * obt.fragsize & hw->info.align) {
717	dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
718	obt.nfrags * obt.fragsize, hw->info.align + 1);
719	}
720
721	hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
722	oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
723	if (!oss->pcm_buf) {
724	dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
725	hw->samples, 1 << hw->info.shift);
726	oss_anal_close (&fd);
727	#ifdef VBOX
728	LogRel(("OSS: Closed %s for ADC\n", conf.devpath_in));
729	#endif
730	return -1;
731	}
732
733	oss->fd = fd;
734	return 0;
735	}
736
737	static void oss_fini_in (HWVoiceIn *hw)
738	{
739	OSSVoiceIn oss = (OSSVoiceIn ) hw;
740
741	oss_anal_close (&oss->fd);
742	#ifdef VBOX
743	LogRel(("OSS: Closed %s for ADC\n", conf.devpath_in));
744	#endif
745
746	if (oss->pcm_buf) {
747	qemu_free (oss->pcm_buf);
748	oss->pcm_buf = NULL;
749	}
750	}
751
752	static int oss_run_in (HWVoiceIn *hw)
753	{
754	OSSVoiceIn oss = (OSSVoiceIn ) hw;
755	int hwshift = hw->info.shift;
756	int i;
757	int live = audio_pcm_hw_get_live_in (hw);
758	int dead = hw->samples - live;
759	size_t read_samples = 0;
760	struct {
761	int add;
762	int len;
763	} bufs[2];
764
765	bufs[0].add = hw->wpos;
766	bufs[0].len = 0;
767	bufs[1].add = 0;
768	bufs[1].len = 0;
769
770	if (!dead) {
771	return 0;
772	}
773
774	if (hw->wpos + dead > hw->samples) {
775	bufs[0].len = (hw->samples - hw->wpos) << hwshift;
776	bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
777	}
778	else {
779	bufs[0].len = dead << hwshift;
780	}
781
782
783	for (i = 0; i < 2; ++i) {
784	ssize_t nread;
785
786	if (bufs[i].len) {
787	void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
788	nread = read (oss->fd, p, bufs[i].len);
789
790	if (nread > 0) {
791	if (nread & hw->info.align) {
792	dolog ("warning: Misaligned read %"
793	FMTZ "d (requested %d), "
794	"alignment %d\n", nread, bufs[i].add << hwshift,
795	hw->info.align + 1);
796	}
797	read_samples += nread >> hwshift;
798	#ifndef VBOX
799	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
800	&nominal_volume);
801	#else
802	hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
803	&pcm_in_volume);
804	#endif
805	}
806
807	if (bufs[i].len - nread) {
808	if (nread == -1) {
809	switch (errno) {
810	case EINTR:
811	case EAGAIN:
812	break;
813	default:
814	oss_logerr (
815	errno,
816	"Failed to read %d bytes of audio (to %p)\n",
817	bufs[i].len, p
818	);
819	break;
820	}
821	}
822	break;
823	}
824	}
825	}
826
827	hw->wpos = (hw->wpos + read_samples) % hw->samples;
828	return read_samples;
829	}
830
831	static int oss_read (SWVoiceIn sw, void buf, int size)
832	{
833	return audio_pcm_sw_read (sw, buf, size);
834	}
835
836	static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
837	{
838	(void) hw;
839	(void) cmd;
840	return 0;
841	}
842
843	static void *oss_audio_init (void)
844	{
845	return &conf;
846	}
847
848	static void oss_audio_fini (void *opaque)
849	{
850	(void) opaque;
851	}
852
853	static struct audio_option oss_options[] = {
854	{"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
855	"Fragment size in bytes", NULL, 0},
856	{"NFRAGS", AUD_OPT_INT, &conf.nfrags,
857	"Number of fragments", NULL, 0},
858	#ifndef RT_OS_L4
859	{"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
860	"Try using memory mapped access", NULL, 0},
861	#endif
862	{"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
863	"Path to DAC device", NULL, 0},
864	{"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
865	"Path to ADC device", NULL, 0},
866	{"DEBUG", AUD_OPT_BOOL, &conf.debug,
867	"Turn on some debugging messages", NULL, 0},
868	{NULL, 0, NULL, NULL, NULL, 0}
869	};
870
871	static struct audio_pcm_ops oss_pcm_ops = {
872	oss_init_out,
873	oss_fini_out,
874	oss_run_out,
875	oss_write,
876	oss_ctl_out,
877
878	oss_init_in,
879	oss_fini_in,
880	oss_run_in,
881	oss_read,
882	oss_ctl_in
883	};
884
885	struct audio_driver oss_audio_driver = {
886	INIT_FIELD (name = ) "oss",
887	INIT_FIELD (descr = ) "OSS http://www.opensound.com",
888	INIT_FIELD (options = ) oss_options,
889	INIT_FIELD (init = ) oss_audio_init,
890	INIT_FIELD (fini = ) oss_audio_fini,
891	INIT_FIELD (pcm_ops = ) &oss_pcm_ops,
892	INIT_FIELD (can_be_default = ) 1,
893	INIT_FIELD (max_voices_out = ) INT_MAX,
894	INIT_FIELD (max_voices_in = ) INT_MAX,
895	INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
896	INIT_FIELD (voice_size_in = ) sizeof (OSSVoiceIn)
897	};

注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

source: vbox/trunk/src/VBox/Devices/Audio/ossaudio.c@ 38905

以其他格式下載: