pulseaudio.c@ 17225

Last change on this file since 17225 was 15783, checked in by vboxsync, 16 years ago
pulse: limit the number of release warnings
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 19.5 KB

Line
1	/** @file
2	*
3	* VBox PulseAudio backend
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_DEV_AUDIO
27	#include <VBox/log.h>
28	#include <iprt/mem.h>
29
30	#include <pulse/pulseaudio.h>
31	#include "pulse_stubs.h"
32
33	#include "../../vl_vbox.h"
34	#include "audio.h"
35	#define AUDIO_CAP "pulse"
36	#include "audio_int.h"
37	#include <stdio.h>
38
39	#define MAX_LOG_REL_ERRORS 128
40
41	/*
42	* We use a g_pMainLoop in a separate thread g_pContext. We have to call functions for
43	* manipulating objects either from callback functions or we have to protect
44	* these functions by pa_threaded_mainloop_lock() / pa_threaded_mainloop_unlock().
45	*/
46	static struct pa_threaded_mainloop *g_pMainLoop;
47	static struct pa_context *g_pContext;
48
49	static void pulse_audio_fini (void *);
50
51	typedef struct PulseVoice
52	{
53	HWVoiceOut hw;
54	void *pPCMBuf;
55	pa_stream *pStream;
56	int fOpSuccess;
57	unsigned cErrors;
58	} PulseVoice;
59
60	static struct
61	{
62	int buffer_msecs_out;
63	int buffer_msecs_in;
64	} conf
65	=
66	{
67	INIT_FIELD (.buffer_msecs_out = ) 100,
68	INIT_FIELD (.buffer_msecs_in = ) 100,
69	};
70
71	struct pulse_params_req
72	{
73	int freq;
74	pa_sample_format_t pa_format;
75	int nchannels;
76	};
77
78	struct pulse_params_obt
79	{
80	int freq;
81	pa_sample_format_t pa_format;
82	int nchannels;
83	unsigned long buffer_size;
84	};
85
86	static pa_sample_format_t aud_to_pulsefmt (audfmt_e fmt)
87	{
88	switch (fmt)
89	{
90	case AUD_FMT_U8:
91	return PA_SAMPLE_U8;
92
93	case AUD_FMT_S16:
94	return PA_SAMPLE_S16LE;
95
96	#ifdef PA_SAMPLE_S32LE
97	case AUD_FMT_S32:
98	return PA_SAMPLE_S32LE;
99	#endif
100
101	default:
102	dolog ("Bad audio format %d\n", fmt);
103	return PA_SAMPLE_U8;
104	}
105	}
106
107
108	static int pulse_to_audfmt (pa_sample_format_t pulsefmt, audfmt_e fmt, int endianess)
109	{
110	switch (pulsefmt)
111	{
112	case PA_SAMPLE_U8:
113	*endianess = 0;
114	*fmt = AUD_FMT_U8;
115	break;
116
117	case PA_SAMPLE_S16LE:
118	*fmt = AUD_FMT_S16;
119	*endianess = 0;
120	break;
121
122	case PA_SAMPLE_S16BE:
123	*fmt = AUD_FMT_S16;
124	*endianess = 1;
125	break;
126
127	#ifdef PA_SAMPLE_S32LE
128	case PA_SAMPLE_S32LE:
129	*fmt = AUD_FMT_S32;
130	*endianess = 0;
131	break;
132	#endif
133
134	#ifdef PA_SAMPLE_S32BE
135	case PA_SAMPLE_S32BE:
136	*fmt = AUD_FMT_S32;
137	*endianess = 1;
138	break;
139	#endif
140
141	default:
142	return -1;
143	}
144	return 0;
145	}
146
147	static void context_state_callback(pa_context c, void userdata)
148	{
149	switch (pa_context_get_state(c))
150	{
151	case PA_CONTEXT_READY:
152	case PA_CONTEXT_TERMINATED:
153	case PA_CONTEXT_FAILED:
154	pa_threaded_mainloop_signal(g_pMainLoop, 0);
155	break;
156	default:
157	break;
158	}
159	}
160
161	static void stream_state_callback(pa_stream s, void userdata)
162	{
163	switch (pa_stream_get_state(s))
164	{
165	case PA_STREAM_READY:
166	case PA_STREAM_FAILED:
167	case PA_STREAM_TERMINATED:
168	pa_threaded_mainloop_signal(g_pMainLoop, 0);
169	break;
170	default:
171	break;
172	}
173	}
174
175	static void stream_latency_update_callback(pa_stream s, void userdata)
176	{
177	pa_threaded_mainloop_signal(g_pMainLoop, 0);
178	}
179
180	static int pulse_open (int fIn, struct pulse_params_req *req,
181	struct pulse_params_obt obt, pa_stream *ppStream)
182	{
183	pa_sample_spec sspec;
184	pa_channel_map cmap;
185	pa_stream *pStream = NULL;
186	pa_buffer_attr bufAttr;
187	const pa_buffer_attr *pBufAttr;
188	const pa_sample_spec *pSampSpec;
189	char achPCMName[64];
190	pa_stream_flags_t flags;
191	int ms = fIn ? conf.buffer_msecs_in : conf.buffer_msecs_out;
192	const char *stream_name = audio_get_stream_name();
193
194	RTStrPrintf(achPCMName, sizeof(achPCMName), "%.32s%s%s%s",
195	stream_name ? stream_name : "",
196	stream_name ? " (" : "",
197	fIn ? "pcm_in" : "pcm_out",
198	stream_name ? ")" : "");
199	sspec.rate = req->freq;
200	sspec.channels = req->nchannels;
201	sspec.format = req->pa_format;
202
203	LogRel(("Pulse: open %s rate=%dHz channels=%d format=%s\n",
204	fIn ? "PCM_IN" : "PCM_OUT", req->freq, req->nchannels,
205	pa_sample_format_to_string(req->pa_format)));
206
207	if (!pa_sample_spec_valid(&sspec))
208	{
209	LogRel(("Pulse: Unsupported sample specification\n"));
210	goto fail;
211	}
212
213	pa_channel_map_init_auto(&cmap, sspec.channels, PA_CHANNEL_MAP_ALSA);
214
215	#if 0
216	pa_cvolume_reset(&volume, sspec.channels);
217	#endif
218
219	pa_threaded_mainloop_lock(g_pMainLoop);
220
221	if (!(pStream = pa_stream_new(g_pContext, achPCMName, &sspec, &cmap)))
222	{
223	LogRel(("Pulse: Cannot create stream %s\n", achPCMName));
224	goto unlock_and_fail;
225	}
226
227	pSampSpec = pa_stream_get_sample_spec(pStream);
228	obt->pa_format = pSampSpec->format;
229	obt->nchannels = pSampSpec->channels;
230	obt->freq = pSampSpec->rate;
231
232	pa_stream_set_state_callback(pStream, stream_state_callback, NULL);
233	pa_stream_set_latency_update_callback(pStream, stream_latency_update_callback, NULL);
234
235	memset(&bufAttr, 0, sizeof(bufAttr));
236	bufAttr.tlength = (pa_bytes_per_second(pSampSpec) * ms) / 1000;
237	bufAttr.maxlength = (bufAttr.tlength*3) / 2;
238	bufAttr.minreq = pa_bytes_per_second(pSampSpec) / 100; /* 10ms */
239	bufAttr.prebuf = bufAttr.tlength - bufAttr.minreq;
240	bufAttr.fragsize = pa_bytes_per_second(pSampSpec) / 100; /* 10ms */
241
242	flags = PA_STREAM_INTERPOLATE_TIMING \| PA_STREAM_AUTO_TIMING_UPDATE;
243	if (fIn)
244	{
245	if (pa_stream_connect_record(pStream, /dev=/NULL, &bufAttr, flags) < 0)
246	{
247	LogRel(("Pulse: Cannot connect record stream : %s\n",
248	pa_strerror(pa_context_errno(g_pContext))));
249	goto disconnect_unlock_and_fail;
250	}
251	}
252	else
253	{
254	if (pa_stream_connect_playback(pStream, /dev=/NULL, &bufAttr, flags,
255	NULL, NULL) < 0)
256	{
257	LogRel(("Pulse: Cannot connect playback stream: %s\n",
258	pa_strerror(pa_context_errno(g_pContext))));
259	goto disconnect_unlock_and_fail;
260	}
261	}
262
263	/* Wait until the stream is ready */
264	for (;;)
265	{
266	pa_stream_state_t sstate;
267	pa_threaded_mainloop_wait(g_pMainLoop);
268	sstate = pa_stream_get_state(pStream);
269	if (sstate == PA_STREAM_READY)
270	break;
271	else if (sstate == PA_STREAM_FAILED \|\| sstate == PA_STREAM_TERMINATED)
272	{
273	LogRel(("Pulse: Failed to initialize stream (state %d)\n", sstate));
274	goto disconnect_unlock_and_fail;
275	}
276	}
277
278	pBufAttr = pa_stream_get_buffer_attr(pStream);
279	obt->buffer_size = pBufAttr->maxlength;
280
281	pa_threaded_mainloop_unlock(g_pMainLoop);
282
283	LogRel(("Pulse: buffer settings: max=%d tlength=%d prebuf=%d minreq=%d\n",
284	pBufAttr->maxlength, pBufAttr->tlength, pBufAttr->prebuf, pBufAttr->minreq));
285
286	*ppStream = pStream;
287	return 0;
288
289	disconnect_unlock_and_fail:
290	pa_stream_disconnect(pStream);
291
292	unlock_and_fail:
293	pa_threaded_mainloop_unlock(g_pMainLoop);
294
295	fail:
296	if (pStream)
297	pa_stream_unref(pStream);
298
299	*ppStream = NULL;
300	return -1;
301	}
302
303	static int pulse_init_out (HWVoiceOut hw, audsettings_t as)
304	{
305	PulseVoice pulse = (PulseVoice ) hw;
306	struct pulse_params_req req;
307	struct pulse_params_obt obt;
308	audfmt_e effective_fmt;
309	int endianness;
310	audsettings_t obt_as;
311
312	req.pa_format = aud_to_pulsefmt (as->fmt);
313	req.freq = as->freq;
314	req.nchannels = as->nchannels;
315
316	if (pulse_open (/fIn=/0, &req, &obt, &pulse->pStream))
317	return -1;
318
319	if (pulse_to_audfmt (obt.pa_format, &effective_fmt, &endianness))
320	{
321	LogRel(("Pulse: Cannot find audio format %d\n", obt.pa_format));
322	return -1;
323	}
324
325	obt_as.freq = obt.freq;
326	obt_as.nchannels = obt.nchannels;
327	obt_as.fmt = effective_fmt;
328	obt_as.endianness = endianness;
329
330	audio_pcm_init_info (&hw->info, &obt_as);
331	hw->samples = obt.buffer_size >> hw->info.shift;
332
333	pulse->pPCMBuf = RTMemAllocZ(obt.buffer_size);
334	if (!pulse->pPCMBuf)
335	{
336	LogRel(("Pulse: Could not allocate DAC buffer of %d bytes\n", obt.buffer_size));
337	return -1;
338	}
339
340	return 0;
341	}
342
343	static void pulse_fini_out (HWVoiceOut *hw)
344	{
345	PulseVoice pulse = (PulseVoice )hw;
346	if (pulse->pStream)
347	{
348	pa_stream_disconnect(pulse->pStream);
349	pa_stream_unref(pulse->pStream);
350	pulse->pStream = NULL;
351	}
352	if (pulse->pPCMBuf)
353	{
354	RTMemFree (pulse->pPCMBuf);
355	pulse->pPCMBuf = NULL;
356	}
357	}
358
359	static int pulse_run_out (HWVoiceOut *hw)
360	{
361	PulseVoice pulse = (PulseVoice ) hw;
362	int csLive, csDecr, csSamples, csToWrite, csAvail;
363	size_t cbAvail, cbToWrite;
364	uint8_t *pu8Dst;
365	st_sample_t *psSrc;
366
367	csLive = audio_pcm_hw_get_live_out (hw);
368	if (!csLive)
369	return 0;
370
371	pa_threaded_mainloop_lock(g_pMainLoop);
372
373	cbAvail = pa_stream_writable_size (pulse->pStream);
374	if (cbAvail == (size_t)-1)
375	{
376	if (pulse->cErrors++ < MAX_LOG_REL_ERRORS)
377	LogRel(("Pulse: Failed to determine the writable size: %s\n",
378	pa_strerror(pa_context_errno(g_pContext))));
379	return 0;
380	}
381
382	csAvail = cbAvail >> hw->info.shift; /* bytes => samples */
383	csDecr = audio_MIN (csLive, csAvail);
384	csSamples = csDecr;
385
386	while (csSamples)
387	{
388	/* split request at the end of our samples buffer */
389	csToWrite = audio_MIN (csSamples, hw->samples - hw->rpos);
390	cbToWrite = csToWrite << hw->info.shift;
391	psSrc = hw->mix_buf + hw->rpos;
392	pu8Dst = advance (pulse->pPCMBuf, hw->rpos << hw->info.shift);
393
394	hw->clip (pu8Dst, psSrc, csToWrite);
395
396	if (pa_stream_write (pulse->pStream, pu8Dst, cbToWrite,
397	/cleanup_callback=/NULL, 0, PA_SEEK_RELATIVE) < 0)
398	{
399	LogRel(("Pulse: Failed to write %d samples: %s\n",
400	csToWrite, pa_strerror(pa_context_errno(g_pContext))));
401	break;
402	}
403	hw->rpos = (hw->rpos + csToWrite) % hw->samples;
404	csSamples -= csToWrite;
405	}
406
407	pa_threaded_mainloop_unlock(g_pMainLoop);
408
409	return csDecr;
410	}
411
412	static int pulse_write (SWVoiceOut sw, void buf, int len)
413	{
414	return audio_pcm_sw_write (sw, buf, len);
415	}
416
417	static void stream_success_callback(pa_stream pStream, int success, void userdata)
418	{
419	PulseVoice pulse = (PulseVoice ) userdata;
420	pulse->fOpSuccess = success;
421	pa_threaded_mainloop_signal(g_pMainLoop, 0);
422	}
423
424	typedef enum
425	{
426	Unpause = 0,
427	Pause = 1,
428	Flush = 2,
429	Trigger = 3
430	} pulse_cmd_t;
431
432	static int pulse_ctrl (HWVoiceOut *hw, pulse_cmd_t cmd)
433	{
434	PulseVoice pulse = (PulseVoice ) hw;
435	pa_operation *op = NULL;
436
437	if (!pulse->pStream)
438	return 0;
439
440	pa_threaded_mainloop_lock(g_pMainLoop);
441	switch (cmd)
442	{
443	case Pause:
444	op = pa_stream_cork(pulse->pStream, 1, stream_success_callback, pulse);
445	break;
446	case Unpause:
447	op = pa_stream_cork(pulse->pStream, 0, stream_success_callback, pulse);
448	break;
449	case Flush:
450	op = pa_stream_flush(pulse->pStream, stream_success_callback, pulse);
451	break;
452	case Trigger:
453	op = pa_stream_trigger(pulse->pStream, stream_success_callback, pulse);
454	break;
455	default:
456	goto fail;
457	}
458	if (!op)
459	LogRel(("Pulse: Failed ctrl cmd=%d to stream: %s\n",
460	cmd, pa_strerror(pa_context_errno(g_pContext))));
461	else
462	pa_operation_unref(op);
463
464	fail:
465	pa_threaded_mainloop_unlock(g_pMainLoop);
466	return 0;
467	}
468
469	static int pulse_ctl_out (HWVoiceOut *hw, int cmd, ...)
470	{
471	switch (cmd)
472	{
473	case VOICE_ENABLE:
474	pulse_ctrl(hw, Unpause);
475	pulse_ctrl(hw, Trigger);
476	break;
477	case VOICE_DISABLE:
478	pulse_ctrl(hw, Flush);
479	break;
480	default:
481	return -1;
482	}
483	return 0;
484	}
485
486	static int pulse_init_in (HWVoiceIn hw, audsettings_t as)
487	{
488	PulseVoice pulse = (PulseVoice ) hw;
489	struct pulse_params_req req;
490	struct pulse_params_obt obt;
491	audfmt_e effective_fmt;
492	int endianness;
493	audsettings_t obt_as;
494
495	req.pa_format = aud_to_pulsefmt (as->fmt);
496	req.freq = as->freq;
497	req.nchannels = as->nchannels;
498
499	if (pulse_open (/fIn=/1, &req, &obt, &pulse->pStream))
500	return -1;
501
502	if (pulse_to_audfmt (obt.pa_format, &effective_fmt, &endianness))
503	{
504	LogRel(("Pulse: Cannot find audio format %d\n", obt.pa_format));
505	return -1;
506	}
507
508	obt_as.freq = obt.freq;
509	obt_as.nchannels = obt.nchannels;
510	obt_as.fmt = effective_fmt;
511	obt_as.endianness = endianness;
512
513	audio_pcm_init_info (&hw->info, &obt_as);
514
515	/* pcm_in: reserve twice as the maximum buffer length because of peek()/drop(). */
516	hw->samples = 2 * (obt.buffer_size >> hw->info.shift);
517
518	/* no buffer for input */
519	pulse->pPCMBuf = NULL;
520
521	return 0;
522	}
523
524	static void pulse_fini_in (HWVoiceIn *hw)
525	{
526	PulseVoice pulse = (PulseVoice )hw;
527	if (pulse->pStream)
528	{
529	pa_stream_disconnect(pulse->pStream);
530	pa_stream_unref(pulse->pStream);
531	pulse->pStream = NULL;
532	}
533	if (pulse->pPCMBuf)
534	{
535	RTMemFree (pulse->pPCMBuf);
536	pulse->pPCMBuf = NULL;
537	}
538	}
539
540	static int pulse_run_in (HWVoiceIn *hw)
541	{
542	PulseVoice pulse = (PulseVoice ) hw;
543	int csDead, csDecr = 0, csSamples, csRead, csAvail;
544	size_t cbAvail;
545	const void *pu8Src;
546	st_sample_t *psDst;
547
548	csDead = hw->samples - audio_pcm_hw_get_live_in (hw);
549
550	if (!csDead)
551	return 0; /* no buffer available */
552
553	pa_threaded_mainloop_lock(g_pMainLoop);
554
555	if (pa_stream_peek(pulse->pStream, &pu8Src, &cbAvail) < 0)
556	{
557	LogRel(("Pulse: Peek failed: %s\n",
558	pa_strerror(pa_context_errno(g_pContext))));
559	goto exit;
560	}
561	if (!pu8Src)
562	goto exit;
563
564	csAvail = cbAvail >> hw->info.shift;
565	csDecr = audio_MIN (csDead, csAvail);
566
567	csSamples = csDecr;
568
569	while (csSamples)
570	{
571	/* split request at the end of our samples buffer */
572	psDst = hw->conv_buf + hw->wpos;
573	csRead = audio_MIN (csSamples, hw->samples - hw->wpos);
574	hw->conv (psDst, pu8Src, csRead, &nominal_volume);
575	hw->wpos = (hw->wpos + csRead) % hw->samples;
576	csSamples -= csRead;
577	pu8Src = (const void)((uint8_t)pu8Src + (csRead << hw->info.shift));
578	}
579
580	pa_stream_drop(pulse->pStream);
581
582	exit:
583	pa_threaded_mainloop_unlock(g_pMainLoop);
584
585	return csDecr;
586	}
587
588	static int pulse_read (SWVoiceIn sw, void buf, int size)
589	{
590	return audio_pcm_sw_read (sw, buf, size);
591	}
592
593	static int pulse_ctl_in (HWVoiceIn *hw, int cmd, ...)
594	{
595	return 0;
596	}
597
598	static void *pulse_audio_init (void)
599	{
600	int rc;
601
602	rc = audioLoadPulseLib();
603	if (RT_FAILURE(rc))
604	{
605	LogRel(("Pulse: Failed to load the PulseAudio shared library! Error %Rrc\n", rc));
606	return NULL;
607	}
608	if (!(g_pMainLoop = pa_threaded_mainloop_new()))
609	{
610	LogRel(("Pulse: Failed to allocate main loop: %s\n",
611	pa_strerror(pa_context_errno(g_pContext))));
612	goto fail;
613	}
614	if (!(g_pContext = pa_context_new(pa_threaded_mainloop_get_api(g_pMainLoop), "VBox")))
615	{
616	LogRel(("Pulse: Failed to allocate context: %s\n",
617	pa_strerror(pa_context_errno(g_pContext))));
618	goto fail;
619	}
620	if (pa_threaded_mainloop_start(g_pMainLoop) < 0)
621	{
622	LogRel(("Pulse: Failed to start threaded mainloop: %s\n",
623	pa_strerror(pa_context_errno(g_pContext))));
624	goto fail;
625	}
626
627	pa_context_set_state_callback(g_pContext, context_state_callback, NULL);
628	pa_threaded_mainloop_lock(g_pMainLoop);
629
630	if (pa_context_connect(g_pContext, /server=/NULL, 0, NULL) < 0)
631	{
632	LogRel(("Pulse: Failed to connect to server: %s\n",
633	pa_strerror(pa_context_errno(g_pContext))));
634	goto unlock_and_fail;
635	}
636
637	/* Wait until the g_pContext is ready */
638	for (;;)
639	{
640	pa_context_state_t cstate;
641	pa_threaded_mainloop_wait(g_pMainLoop);
642	cstate = pa_context_get_state(g_pContext);
643	if (cstate == PA_CONTEXT_READY)
644	break;
645	else if (cstate == PA_CONTEXT_TERMINATED \|\| cstate == PA_CONTEXT_FAILED)
646	{
647	LogRel(("Pulse: Failed to initialize context (state %d)\n", cstate));
648	goto unlock_and_fail;
649	}
650	}
651	pa_threaded_mainloop_unlock(g_pMainLoop);
652
653	return &conf;
654
655	unlock_and_fail:
656	if (g_pMainLoop)
657	pa_threaded_mainloop_unlock(g_pMainLoop);
658
659	fail:
660	if (g_pMainLoop)
661	pa_threaded_mainloop_stop(g_pMainLoop);
662
663	if (g_pContext)
664	{
665	pa_context_disconnect(g_pContext);
666	pa_context_unref(g_pContext);
667	g_pContext = NULL;
668	}
669	if (g_pMainLoop)
670	{
671	pa_threaded_mainloop_free(g_pMainLoop);
672	g_pMainLoop = NULL;
673	}
674	return NULL;
675	}
676
677	static void pulse_audio_fini (void *opaque)
678	{
679	if (g_pMainLoop)
680	pa_threaded_mainloop_stop(g_pMainLoop);
681	if (g_pContext)
682	{
683	pa_context_disconnect(g_pContext);
684	pa_context_unref(g_pContext);
685	g_pContext = NULL;
686	}
687	if (g_pMainLoop)
688	{
689	pa_threaded_mainloop_free(g_pMainLoop);
690	g_pMainLoop = NULL;
691	}
692	(void) opaque;
693	}
694
695	static struct audio_option pulse_options[] =
696	{
697	{"DAC_MS", AUD_OPT_INT, &conf.buffer_msecs_out,
698	"DAC period size in milliseconds", NULL, 0},
699	{"ADC_MS", AUD_OPT_INT, &conf.buffer_msecs_in,
700	"ADC period size in milliseconds", NULL, 0},
701	{NULL, 0, NULL, NULL, NULL, 0}
702	};
703
704	static struct audio_pcm_ops pulse_pcm_ops =
705	{
706	pulse_init_out,
707	pulse_fini_out,
708	pulse_run_out,
709	pulse_write,
710	pulse_ctl_out,
711
712	pulse_init_in,
713	pulse_fini_in,
714	pulse_run_in,
715	pulse_read,
716	pulse_ctl_in
717	};
718
719	struct audio_driver pulse_audio_driver =
720	{
721	INIT_FIELD (name = ) "pulse",
722	INIT_FIELD (descr = ) "PulseAudio http://www.pulseaudio.org",
723	INIT_FIELD (options = ) pulse_options,
724	INIT_FIELD (init = ) pulse_audio_init,
725	INIT_FIELD (fini = ) pulse_audio_fini,
726	INIT_FIELD (pcm_ops = ) &pulse_pcm_ops,
727	INIT_FIELD (can_be_default = ) 1,
728	INIT_FIELD (max_voices_out = ) INT_MAX,
729	INIT_FIELD (max_voices_in = ) INT_MAX,
730	INIT_FIELD (voice_size_out = ) sizeof (PulseVoice),
731	INIT_FIELD (voice_size_in = ) sizeof (PulseVoice)
732	};

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source: vbox/trunk/src/VBox/Devices/Audio/pulseaudio.c@ 17225

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