DrvHostALSAAudio.cpp@ 78135

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1	/* $Id: DrvHostALSAAudio.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* ALSA audio driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
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	*
18	* This code is based on: alsaaudio.c
19	*
20	* QEMU ALSA audio driver
21	*
22	* Copyright (c) 2005 Vassili Karpov (malc)
23	*
24	* Permission is hereby granted, free of charge, to any person obtaining a copy
25	* of this software and associated documentation files (the "Software"), to deal
26	* in the Software without restriction, including without limitation the rights
27	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
28	* copies of the Software, and to permit persons to whom the Software is
29	* furnished to do so, subject to the following conditions:
30	*
31	* The above copyright notice and this permission notice shall be included in
32	* all copies or substantial portions of the Software.
33	*
34	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
35	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
36	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
37	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
38	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
39	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
40	* THE SOFTWARE.
41	*/
42
43
44	/*********************************************************************************************************************************
45	* Header Files *
46	*********************************************************************************************************************************/
47	#define LOG_GROUP LOG_GROUP_DRV_HOST_AUDIO
48	#include <VBox/log.h>
49	#include <iprt/alloc.h>
50	#include <iprt/uuid.h> /* For PDMIBASE_2_PDMDRV. */
51	#include <VBox/vmm/pdmaudioifs.h>
52
53	RT_C_DECLS_BEGIN
54	#include "alsa_stubs.h"
55	#include "alsa_mangling.h"
56	RT_C_DECLS_END
57
58	#include <alsa/asoundlib.h>
59	#include <alsa/control.h> /* For device enumeration. */
60
61	#include "DrvAudio.h"
62	#include "VBoxDD.h"
63
64
65	/*********************************************************************************************************************************
66	* Defines *
67	*********************************************************************************************************************************/
68
69	/** Makes DRVHOSTALSAAUDIO out of PDMIHOSTAUDIO. */
70	#define PDMIHOSTAUDIO_2_DRVHOSTALSAAUDIO(pInterface) \
71	( (PDRVHOSTALSAAUDIO)((uintptr_t)pInterface - RT_UOFFSETOF(DRVHOSTALSAAUDIO, IHostAudio)) )
72
73
74	/*********************************************************************************************************************************
75	* Structures *
76	*********************************************************************************************************************************/
77
78	typedef struct ALSAAUDIOSTREAM
79	{
80	/** The stream's acquired configuration. */
81	PPDMAUDIOSTREAMCFG pCfg;
82	union
83	{
84	struct
85	{
86	} In;
87	struct
88	{
89	} Out;
90	};
91	snd_pcm_t *phPCM;
92	void *pvBuf;
93	size_t cbBuf;
94	} ALSAAUDIOSTREAM, *PALSAAUDIOSTREAM;
95
96	/* latency = period_size * periods / (rate * bytes_per_frame) */
97
98	static int alsaStreamRecover(snd_pcm_t *phPCM);
99
100	/**
101	* Host Alsa audio driver instance data.
102	* @implements PDMIAUDIOCONNECTOR
103	*/
104	typedef struct DRVHOSTALSAAUDIO
105	{
106	/** Pointer to the driver instance structure. */
107	PPDMDRVINS pDrvIns;
108	/** Pointer to host audio interface. */
109	PDMIHOSTAUDIO IHostAudio;
110	/** Error count for not flooding the release log.
111	* UINT32_MAX for unlimited logging. */
112	uint32_t cLogErrors;
113	} DRVHOSTALSAAUDIO, *PDRVHOSTALSAAUDIO;
114
115	/** Maximum number of tries to recover a broken pipe. */
116	#define ALSA_RECOVERY_TRIES_MAX 5
117
118	typedef struct ALSAAUDIOSTREAMCFG
119	{
120	unsigned int freq;
121	/** PCM sound format. */
122	snd_pcm_format_t fmt;
123	/** PCM data access type. */
124	snd_pcm_access_t access;
125	/** Whether resampling should be performed by alsalib or not. */
126	int resample;
127	int nchannels;
128	/** Buffer size (in audio frames). */
129	unsigned long buffer_size;
130	/** Periods (in audio frames). */
131	unsigned long period_size;
132	/** For playback: Starting to play threshold (in audio frames).
133	* For Capturing: Starting to capture threshold (in audio frames). */
134	unsigned long threshold;
135	} ALSAAUDIOSTREAMCFG, *PALSAAUDIOSTREAMCFG;
136
137
138
139	static snd_pcm_format_t alsaAudioPropsToALSA(PPDMAUDIOPCMPROPS pProps)
140	{
141	switch (pProps->cBytes)
142	{
143	case 1:
144	return pProps->fSigned ? SND_PCM_FORMAT_S8 : SND_PCM_FORMAT_U8;
145
146	case 2:
147	return pProps->fSigned ? SND_PCM_FORMAT_S16_LE : SND_PCM_FORMAT_U16_LE;
148
149	case 4:
150	return pProps->fSigned ? SND_PCM_FORMAT_S32_LE : SND_PCM_FORMAT_U32_LE;
151
152	default:
153	break;
154	}
155
156	AssertMsgFailed(("%RU8 bytes not supported\n", pProps->cBytes));
157	return SND_PCM_FORMAT_U8;
158	}
159
160
161	static int alsaALSAToAudioProps(snd_pcm_format_t fmt, PPDMAUDIOPCMPROPS pProps)
162	{
163	switch (fmt)
164	{
165	case SND_PCM_FORMAT_S8:
166	pProps->cBytes = 1;
167	pProps->fSigned = true;
168	break;
169
170	case SND_PCM_FORMAT_U8:
171	pProps->cBytes = 1;
172	pProps->fSigned = false;
173	break;
174
175	case SND_PCM_FORMAT_S16_LE:
176	pProps->cBytes = 2;
177	pProps->fSigned = true;
178	break;
179
180	case SND_PCM_FORMAT_U16_LE:
181	pProps->cBytes = 2;
182	pProps->fSigned = false;
183	break;
184
185	case SND_PCM_FORMAT_S16_BE:
186	pProps->cBytes = 2;
187	pProps->fSigned = true;
188	#ifdef RT_LITTLE_ENDIAN
189	pProps->fSwapEndian = true;
190	#endif
191	break;
192
193	case SND_PCM_FORMAT_U16_BE:
194	pProps->cBytes = 2;
195	pProps->fSigned = false;
196	#ifdef RT_LITTLE_ENDIAN
197	pProps->fSwapEndian = true;
198	#endif
199	break;
200
201	case SND_PCM_FORMAT_S32_LE:
202	pProps->cBytes = 4;
203	pProps->fSigned = true;
204	break;
205
206	case SND_PCM_FORMAT_U32_LE:
207	pProps->cBytes = 4;
208	pProps->fSigned = false;
209	break;
210
211	case SND_PCM_FORMAT_S32_BE:
212	pProps->cBytes = 4;
213	pProps->fSigned = true;
214	#ifdef RT_LITTLE_ENDIAN
215	pProps->fSwapEndian = true;
216	#endif
217	break;
218
219	case SND_PCM_FORMAT_U32_BE:
220	pProps->cBytes = 4;
221	pProps->fSigned = false;
222	#ifdef RT_LITTLE_ENDIAN
223	pProps->fSwapEndian = true;
224	#endif
225	break;
226
227	default:
228	AssertMsgFailed(("Format %ld not supported\n", fmt));
229	return VERR_NOT_SUPPORTED;
230	}
231
232	Assert(pProps->cBytes);
233	Assert(pProps->cChannels);
234	pProps->cShift = PDMAUDIOPCMPROPS_MAKE_SHIFT_PARMS(pProps->cBytes, pProps->cChannels);
235
236	return VINF_SUCCESS;
237	}
238
239
240	static int alsaStreamSetSWParams(snd_pcm_t *phPCM, bool fIn, PALSAAUDIOSTREAMCFG pCfgReq, PALSAAUDIOSTREAMCFG pCfgObt)
241	{
242	if (fIn) /* For input streams there's nothing to do in here right now. */
243	return VINF_SUCCESS;
244
245	snd_pcm_sw_params_t *pSWParms = NULL;
246	snd_pcm_sw_params_alloca(&pSWParms);
247	if (!pSWParms)
248	return VERR_NO_MEMORY;
249
250	int rc;
251	do
252	{
253	int err = snd_pcm_sw_params_current(phPCM, pSWParms);
254	if (err < 0)
255	{
256	LogRel(("ALSA: Failed to get current software parameters: %s\n", snd_strerror(err)));
257	rc = VERR_ACCESS_DENIED;
258	break;
259	}
260
261	err = snd_pcm_sw_params_set_start_threshold(phPCM, pSWParms, pCfgReq->threshold);
262	if (err < 0)
263	{
264	LogRel(("ALSA: Failed to set software threshold to %ld: %s\n", pCfgReq->threshold, snd_strerror(err)));
265	rc = VERR_ACCESS_DENIED;
266	break;
267	}
268
269	err = snd_pcm_sw_params_set_avail_min(phPCM, pSWParms, pCfgReq->period_size);
270	if (err < 0)
271	{
272	LogRel(("ALSA: Failed to set available minimum to %ld: %s\n", pCfgReq->threshold, snd_strerror(err)));
273	rc = VERR_ACCESS_DENIED;
274	break;
275	}
276
277	err = snd_pcm_sw_params(phPCM, pSWParms);
278	if (err < 0)
279	{
280	LogRel(("ALSA: Failed to set new software parameters: %s\n", snd_strerror(err)));
281	rc = VERR_ACCESS_DENIED;
282	break;
283	}
284
285	err = snd_pcm_sw_params_get_start_threshold(pSWParms, &pCfgObt->threshold);
286	if (err < 0)
287	{
288	LogRel(("ALSA: Failed to get start threshold\n"));
289	rc = VERR_ACCESS_DENIED;
290	break;
291	}
292
293	LogFunc(("Setting threshold to %RU32 frames\n", pCfgObt->threshold));
294	rc = VINF_SUCCESS;
295	}
296	while (0);
297
298	return rc;
299	}
300
301
302	static int alsaStreamClose(snd_pcm_t **pphPCM)
303	{
304	if (!pphPCM \|\| !*pphPCM)
305	return VINF_SUCCESS;
306
307	int rc;
308	int rc2 = snd_pcm_close(*pphPCM);
309	if (rc2)
310	{
311	LogRel(("ALSA: Closing PCM descriptor failed: %s\n", snd_strerror(rc2)));
312	rc = VERR_GENERAL_FAILURE; /** @todo */
313	}
314	else
315	{
316	*pphPCM = NULL;
317	rc = VINF_SUCCESS;
318	}
319
320	LogFlowFuncLeaveRC(rc);
321	return rc;
322	}
323
324
325	static int alsaStreamOpen(bool fIn, PALSAAUDIOSTREAMCFG pCfgReq, PALSAAUDIOSTREAMCFG pCfgObt, snd_pcm_t **pphPCM)
326	{
327	snd_pcm_t *phPCM = NULL;
328
329	int rc = VERR_AUDIO_STREAM_COULD_NOT_CREATE;
330
331	unsigned int cChannels = pCfgReq->nchannels;
332	unsigned int uFreq = pCfgReq->freq;
333	snd_pcm_uframes_t obt_buffer_size;
334
335	do
336	{
337	const char pszDev = "default"; /* @todo Make this configurable through PALSAAUDIOSTREAMCFG. */
338	if (!pszDev)
339	{
340	LogRel(("ALSA: Invalid or no %s device name set\n", fIn ? "input" : "output"));
341	rc = VERR_INVALID_PARAMETER;
342	break;
343	}
344
345	LogRel(("ALSA: Using %s device \"%s\"\n", fIn ? "input" : "output", pszDev));
346
347	int err = snd_pcm_open(&phPCM, pszDev,
348	fIn ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK,
349	SND_PCM_NONBLOCK);
350	if (err < 0)
351	{
352	LogRel(("ALSA: Failed to open \"%s\" as %s device: %s\n", pszDev, fIn ? "input" : "output", snd_strerror(err)));
353	break;
354	}
355
356	err = snd_pcm_nonblock(phPCM, 1);
357	if (err < 0)
358	{
359	LogRel(("ALSA: Error setting output non-blocking mode: %s\n", snd_strerror(err)));
360	break;
361	}
362
363	snd_pcm_hw_params_t *pHWParms;
364	snd_pcm_hw_params_alloca(&pHWParms); /** @todo Check for successful allocation? */
365	err = snd_pcm_hw_params_any(phPCM, pHWParms);
366	if (err < 0)
367	{
368	LogRel(("ALSA: Failed to initialize hardware parameters: %s\n", snd_strerror(err)));
369	break;
370	}
371
372	err = snd_pcm_hw_params_set_access(phPCM, pHWParms, SND_PCM_ACCESS_RW_INTERLEAVED);
373	if (err < 0)
374	{
375	LogRel(("ALSA: Failed to set access type: %s\n", snd_strerror(err)));
376	break;
377	}
378
379	err = snd_pcm_hw_params_set_format(phPCM, pHWParms, pCfgReq->fmt);
380	if (err < 0)
381	{
382	LogRel(("ALSA: Failed to set audio format to %d: %s\n", pCfgReq->fmt, snd_strerror(err)));
383	break;
384	}
385
386	err = snd_pcm_hw_params_set_rate_near(phPCM, pHWParms, &uFreq, 0);
387	if (err < 0)
388	{
389	LogRel(("ALSA: Failed to set frequency to %uHz: %s\n", pCfgReq->freq, snd_strerror(err)));
390	break;
391	}
392
393	err = snd_pcm_hw_params_set_channels_near(phPCM, pHWParms, &cChannels);
394	if (err < 0)
395	{
396	LogRel(("ALSA: Failed to set number of channels to %d\n", pCfgReq->nchannels));
397	break;
398	}
399
400	if ( cChannels != 1
401	&& cChannels != 2)
402	{
403	LogRel(("ALSA: Number of audio channels (%u) not supported\n", cChannels));
404	break;
405	}
406
407	snd_pcm_uframes_t period_size_f = pCfgReq->period_size;
408	snd_pcm_uframes_t buffer_size_f = pCfgReq->buffer_size;
409
410	snd_pcm_uframes_t minval = period_size_f;
411
412	int dir = 0;
413	err = snd_pcm_hw_params_get_period_size_min(pHWParms, &minval, &dir);
414	if (err < 0)
415	{
416	LogRel(("ALSA: Could not determine minimal period size\n"));
417	break;
418	}
419	else
420	{
421	LogFunc(("Minimal period size is: %ld\n", minval));
422	if (period_size_f < minval)
423	period_size_f = minval;
424	}
425
426	err = snd_pcm_hw_params_set_period_size_near(phPCM, pHWParms, &period_size_f, 0);
427	LogFunc(("Period size is: %RU32\n", period_size_f));
428	if (err < 0)
429	{
430	LogRel(("ALSA: Failed to set period size %d (%s)\n", period_size_f, snd_strerror(err)));
431	break;
432	}
433
434	minval = buffer_size_f;
435	err = snd_pcm_hw_params_get_buffer_size_min(pHWParms, &minval);
436	if (err < 0)
437	{
438	LogRel(("ALSA: Could not retrieve minimal buffer size\n"));
439	break;
440	}
441	else
442	LogFunc(("Minimal buffer size is: %RU32\n", minval));
443
444	err = snd_pcm_hw_params_set_buffer_size_near(phPCM, pHWParms, &buffer_size_f);
445	if (err < 0)
446	{
447	LogRel(("ALSA: Failed to set near buffer size %RU32: %s\n", buffer_size_f, snd_strerror(err)));
448	break;
449	}
450
451	err = snd_pcm_hw_params(phPCM, pHWParms);
452	if (err < 0)
453	{
454	LogRel(("ALSA: Failed to apply audio parameters\n"));
455	break;
456	}
457
458	err = snd_pcm_hw_params_get_buffer_size(pHWParms, &obt_buffer_size);
459	if (err < 0)
460	{
461	LogRel(("ALSA: Failed to get buffer size\n"));
462	break;
463	}
464
465	snd_pcm_uframes_t obt_period_size;
466	err = snd_pcm_hw_params_get_period_size(pHWParms, &obt_period_size, &dir);
467	if (err < 0)
468	{
469	LogRel(("ALSA: Failed to get period size\n"));
470	break;
471	}
472
473	LogRel2(("ALSA: Frequency is %dHz, period size is %RU32 frames, buffer size is %RU32 frames\n",
474	pCfgReq->freq, obt_period_size, obt_buffer_size));
475
476	err = snd_pcm_prepare(phPCM);
477	if (err < 0)
478	{
479	LogRel(("ALSA: Could not prepare hPCM %p\n", (void *)phPCM));
480	rc = VERR_AUDIO_BACKEND_INIT_FAILED;
481	break;
482	}
483
484	rc = alsaStreamSetSWParams(phPCM, fIn, pCfgReq, pCfgObt);
485	if (RT_FAILURE(rc))
486	break;
487
488	pCfgObt->fmt = pCfgReq->fmt;
489	pCfgObt->nchannels = cChannels;
490	pCfgObt->freq = uFreq;
491	pCfgObt->period_size = obt_period_size;
492	pCfgObt->buffer_size = obt_buffer_size;
493
494	rc = VINF_SUCCESS;
495	}
496	while (0);
497
498	if (RT_SUCCESS(rc))
499	{
500	*pphPCM = phPCM;
501	}
502	else
503	alsaStreamClose(&phPCM);
504
505	LogFlowFuncLeaveRC(rc);
506	return rc;
507	}
508
509
510	#ifdef DEBUG
511	static void alsaDbgErrorHandler(const char file, int line, const char function,
512	int err, const char *fmt, ...)
513	{
514	/** @todo Implement me! */
515	RT_NOREF(file, line, function, err, fmt);
516	}
517	#endif
518
519
520	static int alsaStreamGetAvail(snd_pcm_t phPCM, snd_pcm_sframes_t pFramesAvail)
521	{
522	AssertPtrReturn(phPCM, VERR_INVALID_POINTER);
523	/* pFramesAvail is optional. */
524
525	int rc;
526
527	snd_pcm_sframes_t framesAvail = snd_pcm_avail_update(phPCM);
528	if (framesAvail < 0)
529	{
530	if (framesAvail == -EPIPE)
531	{
532	rc = alsaStreamRecover(phPCM);
533	if (RT_SUCCESS(rc))
534	framesAvail = snd_pcm_avail_update(phPCM);
535	}
536	else
537	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
538	}
539	else
540	rc = VINF_SUCCESS;
541
542	if (RT_SUCCESS(rc))
543	{
544	if (pFramesAvail)
545	*pFramesAvail = framesAvail;
546	}
547
548	LogFunc(("cFrames=%ld, rc=%Rrc\n", framesAvail, rc));
549	return rc;
550	}
551
552
553	static int alsaStreamRecover(snd_pcm_t *phPCM)
554	{
555	AssertPtrReturn(phPCM, VERR_INVALID_POINTER);
556
557	int err = snd_pcm_prepare(phPCM);
558	if (err < 0)
559	{
560	LogFunc(("Failed to recover stream %p: %s\n", phPCM, snd_strerror(err)));
561	return VERR_ACCESS_DENIED; /** @todo Find a better rc. */
562	}
563
564	return VINF_SUCCESS;
565	}
566
567
568	static int alsaStreamResume(snd_pcm_t *phPCM)
569	{
570	AssertPtrReturn(phPCM, VERR_INVALID_POINTER);
571
572	int err = snd_pcm_resume(phPCM);
573	if (err < 0)
574	{
575	LogFunc(("Failed to resume stream %p: %s\n", phPCM, snd_strerror(err)));
576	return VERR_ACCESS_DENIED; /** @todo Find a better rc. */
577	}
578
579	return VINF_SUCCESS;
580	}
581
582
583	/**
584	* @interface_method_impl{PDMIHOSTAUDIO,pfnInit}
585	*/
586	static DECLCALLBACK(int) drvHostALSAAudioInit(PPDMIHOSTAUDIO pInterface)
587	{
588	RT_NOREF(pInterface);
589
590	LogFlowFuncEnter();
591
592	int rc = audioLoadAlsaLib();
593	if (RT_FAILURE(rc))
594	LogRel(("ALSA: Failed to load the ALSA shared library, rc=%Rrc\n", rc));
595	else
596	{
597	#ifdef DEBUG
598	snd_lib_error_set_handler(alsaDbgErrorHandler);
599	#endif
600	}
601
602	return rc;
603	}
604
605
606	/**
607	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamCapture}
608	*/
609	static DECLCALLBACK(int) drvHostALSAAudioStreamCapture(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream,
610	void pvBuf, uint32_t cxBuf, uint32_t pcxRead)
611	{
612	AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
613	AssertPtrReturn(pStream, VERR_INVALID_POINTER);
614	AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
615	AssertReturn(cxBuf, VERR_INVALID_PARAMETER);
616	/* pcbRead is optional. */
617
618	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
619
620	snd_pcm_sframes_t cAvail;
621	int rc = alsaStreamGetAvail(pStreamALSA->phPCM, &cAvail);
622	if (RT_FAILURE(rc))
623	{
624	LogFunc(("Error getting number of captured frames, rc=%Rrc\n", rc));
625	return rc;
626	}
627
628	PPDMAUDIOSTREAMCFG pCfg = pStreamALSA->pCfg;
629	AssertPtr(pCfg);
630
631	if (!cAvail) /* No data yet? */
632	{
633	snd_pcm_state_t state = snd_pcm_state(pStreamALSA->phPCM);
634	switch (state)
635	{
636	case SND_PCM_STATE_PREPARED:
637	cAvail = PDMAUDIOSTREAMCFG_B2F(pCfg, cxBuf);
638	break;
639
640	case SND_PCM_STATE_SUSPENDED:
641	{
642	rc = alsaStreamResume(pStreamALSA->phPCM);
643	if (RT_FAILURE(rc))
644	break;
645
646	LogFlow(("Resuming suspended input stream\n"));
647	break;
648	}
649
650	default:
651	LogFlow(("No frames available, state=%d\n", state));
652	break;
653	}
654
655	if (!cAvail)
656	{
657	if (pcxRead)
658	*pcxRead = 0;
659	return VINF_SUCCESS;
660	}
661	}
662
663	/*
664	* Check how much we can read from the capture device without overflowing
665	* the mixer buffer.
666	*/
667	size_t cbToRead = RT_MIN((size_t)PDMAUDIOSTREAMCFG_F2B(pCfg, cAvail), cxBuf);
668
669	LogFlowFunc(("cbToRead=%zu, cAvail=%RI32\n", cbToRead, cAvail));
670
671	uint32_t cbReadTotal = 0;
672
673	snd_pcm_uframes_t cToRead;
674	snd_pcm_sframes_t cRead;
675
676	while ( cbToRead
677	&& RT_SUCCESS(rc))
678	{
679	cToRead = RT_MIN(PDMAUDIOSTREAMCFG_B2F(pCfg, cbToRead),
680	PDMAUDIOSTREAMCFG_B2F(pCfg, pStreamALSA->cbBuf));
681	AssertBreakStmt(cToRead, rc = VERR_NO_DATA);
682	cRead = snd_pcm_readi(pStreamALSA->phPCM, pStreamALSA->pvBuf, cToRead);
683	if (cRead <= 0)
684	{
685	switch (cRead)
686	{
687	case 0:
688	{
689	LogFunc(("No input frames available\n"));
690	rc = VERR_ACCESS_DENIED;
691	break;
692	}
693
694	case -EAGAIN:
695	{
696	/*
697	* Don't set error here because EAGAIN means there are no further frames
698	* available at the moment, try later. As we might have read some frames
699	* already these need to be processed instead.
700	*/
701	cbToRead = 0;
702	break;
703	}
704
705	case -EPIPE:
706	{
707	rc = alsaStreamRecover(pStreamALSA->phPCM);
708	if (RT_FAILURE(rc))
709	break;
710
711	LogFlowFunc(("Recovered from capturing\n"));
712	continue;
713	}
714
715	default:
716	{
717	LogFunc(("Failed to read input frames: %s\n", snd_strerror(cRead)));
718	rc = VERR_GENERAL_FAILURE; /** @todo Fudge! */
719	break;
720	}
721	}
722	}
723	else
724	{
725	/*
726	* We should not run into a full mixer buffer or we loose samples and
727	* run into an endless loop if ALSA keeps producing samples ("null"
728	* capture device for example).
729	*/
730	uint32_t cbRead = PDMAUDIOSTREAMCFG_F2B(pCfg, cRead);
731
732	memcpy(pvBuf, pStreamALSA->pvBuf, cbRead);
733
734	Assert(cbToRead >= cbRead);
735	cbToRead -= cbRead;
736	cbReadTotal += cbRead;
737	}
738	}
739
740	if (RT_SUCCESS(rc))
741	{
742	if (pcxRead)
743	*pcxRead = cbReadTotal;
744	}
745
746	return rc;
747	}
748
749	/**
750	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamPlay}
751	*/
752	static DECLCALLBACK(int) drvHostALSAAudioStreamPlay(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream,
753	const void pvBuf, uint32_t cxBuf, uint32_t pcxWritten)
754	{
755	AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
756	AssertPtrReturn(pStream, VERR_INVALID_POINTER);
757	AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
758	AssertReturn(cxBuf, VERR_INVALID_PARAMETER);
759	/* pcxWritten is optional. */
760
761	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
762
763	PPDMAUDIOSTREAMCFG pCfg = pStreamALSA->pCfg;
764	AssertPtr(pCfg);
765
766	int rc;
767
768	uint32_t cbWrittenTotal = 0;
769
770	do
771	{
772	snd_pcm_sframes_t csAvail;
773	rc = alsaStreamGetAvail(pStreamALSA->phPCM, &csAvail);
774	if (RT_FAILURE(rc))
775	{
776	LogFunc(("Error getting number of playback frames, rc=%Rrc\n", rc));
777	break;
778	}
779
780	if (!csAvail)
781	break;
782
783	size_t cbToWrite = RT_MIN((unsigned)PDMAUDIOSTREAMCFG_F2B(pCfg, csAvail), pStreamALSA->cbBuf);
784	if (!cbToWrite)
785	break;
786
787	/* Do not write more than available. */
788	if (cbToWrite > cxBuf)
789	cbToWrite = cxBuf;
790
791	memcpy(pStreamALSA->pvBuf, pvBuf, cbToWrite);
792
793	snd_pcm_sframes_t csWritten = 0;
794
795	/* Don't try infinitely on recoverable errors. */
796	unsigned iTry;
797	for (iTry = 0; iTry < ALSA_RECOVERY_TRIES_MAX; iTry++)
798	{
799	csWritten = snd_pcm_writei(pStreamALSA->phPCM, pStreamALSA->pvBuf,
800	PDMAUDIOSTREAMCFG_B2F(pCfg, cbToWrite));
801	if (csWritten <= 0)
802	{
803	switch (csWritten)
804	{
805	case 0:
806	{
807	LogFunc(("Failed to write %zu bytes\n", cbToWrite));
808	rc = VERR_ACCESS_DENIED;
809	break;
810	}
811
812	case -EPIPE:
813	{
814	rc = alsaStreamRecover(pStreamALSA->phPCM);
815	if (RT_FAILURE(rc))
816	break;
817
818	LogFlowFunc(("Recovered from playback\n"));
819	continue;
820	}
821
822	case -ESTRPIPE:
823	{
824	/* Stream was suspended and waiting for a recovery. */
825	rc = alsaStreamResume(pStreamALSA->phPCM);
826	if (RT_FAILURE(rc))
827	{
828	LogRel(("ALSA: Failed to resume output stream\n"));
829	break;
830	}
831
832	LogFlowFunc(("Resumed suspended output stream\n"));
833	continue;
834	}
835
836	default:
837	LogFlowFunc(("Failed to write %RU32 bytes, error unknown\n", cbToWrite));
838	rc = VERR_GENERAL_FAILURE; /** @todo */
839	break;
840	}
841	}
842	else
843	break;
844	} /* For number of tries. */
845
846	if ( iTry == ALSA_RECOVERY_TRIES_MAX
847	&& csWritten <= 0)
848	rc = VERR_BROKEN_PIPE;
849
850	if (RT_FAILURE(rc))
851	break;
852
853	cbWrittenTotal = PDMAUDIOSTREAMCFG_F2B(pCfg, csWritten);
854
855	} while (0);
856
857	if (RT_SUCCESS(rc))
858	{
859	if (pcxWritten)
860	*pcxWritten = cbWrittenTotal;
861	}
862
863	return rc;
864	}
865
866
867	static int alsaDestroyStreamIn(PALSAAUDIOSTREAM pStreamALSA)
868	{
869	alsaStreamClose(&pStreamALSA->phPCM);
870
871	if (pStreamALSA->pvBuf)
872	{
873	RTMemFree(pStreamALSA->pvBuf);
874	pStreamALSA->pvBuf = NULL;
875	}
876
877	return VINF_SUCCESS;
878	}
879
880
881	static int alsaDestroyStreamOut(PALSAAUDIOSTREAM pStreamALSA)
882	{
883	alsaStreamClose(&pStreamALSA->phPCM);
884
885	if (pStreamALSA->pvBuf)
886	{
887	RTMemFree(pStreamALSA->pvBuf);
888	pStreamALSA->pvBuf = NULL;
889	}
890
891	return VINF_SUCCESS;
892	}
893
894
895	static int alsaCreateStreamOut(PALSAAUDIOSTREAM pStreamALSA, PPDMAUDIOSTREAMCFG pCfgReq, PPDMAUDIOSTREAMCFG pCfgAcq)
896	{
897	snd_pcm_t *phPCM = NULL;
898
899	int rc;
900
901	do
902	{
903	ALSAAUDIOSTREAMCFG req;
904	req.fmt = alsaAudioPropsToALSA(&pCfgReq->Props);
905	req.freq = pCfgReq->Props.uHz;
906	req.nchannels = pCfgReq->Props.cChannels;
907	req.period_size = pCfgReq->Backend.cfPeriod;
908	req.buffer_size = pCfgReq->Backend.cfBufferSize;
909	req.threshold = pCfgReq->Backend.cfPreBuf;
910
911	ALSAAUDIOSTREAMCFG obt;
912	rc = alsaStreamOpen(false /* fIn */, &req, &obt, &phPCM);
913	if (RT_FAILURE(rc))
914	break;
915
916	pCfgAcq->Props.uHz = obt.freq;
917	pCfgAcq->Props.cChannels = obt.nchannels;
918
919	rc = alsaALSAToAudioProps(obt.fmt, &pCfgAcq->Props);
920	if (RT_FAILURE(rc))
921	break;
922
923	pCfgAcq->Backend.cfPeriod = obt.period_size;
924	pCfgAcq->Backend.cfBufferSize = obt.buffer_size;
925	pCfgAcq->Backend.cfPreBuf = obt.threshold;
926
927	pStreamALSA->cbBuf = pCfgAcq->Backend.cfBufferSize * DrvAudioHlpPCMPropsBytesPerFrame(&pCfgAcq->Props);
928	pStreamALSA->pvBuf = RTMemAllocZ(pStreamALSA->cbBuf);
929	if (!pStreamALSA->pvBuf)
930	{
931	LogRel(("ALSA: Not enough memory for output DAC buffer (%zu frames)\n", pCfgAcq->Backend.cfBufferSize));
932	rc = VERR_NO_MEMORY;
933	break;
934	}
935
936	pStreamALSA->phPCM = phPCM;
937	}
938	while (0);
939
940	if (RT_FAILURE(rc))
941	alsaStreamClose(&phPCM);
942
943	LogFlowFuncLeaveRC(rc);
944	return rc;
945	}
946
947
948	static int alsaCreateStreamIn(PALSAAUDIOSTREAM pStreamALSA, PPDMAUDIOSTREAMCFG pCfgReq, PPDMAUDIOSTREAMCFG pCfgAcq)
949	{
950	int rc;
951
952	snd_pcm_t *phPCM = NULL;
953
954	do
955	{
956	ALSAAUDIOSTREAMCFG req;
957	req.fmt = alsaAudioPropsToALSA(&pCfgReq->Props);
958	req.freq = pCfgReq->Props.uHz;
959	req.nchannels = pCfgReq->Props.cChannels;
960	req.period_size = DrvAudioHlpMilliToFrames(50 /* ms /, &pCfgReq->Props); /* @todo Make this configurable. */
961	req.buffer_size = req.period_size * 2; /** @todo Make this configurable. */
962	req.threshold = req.period_size;
963
964	ALSAAUDIOSTREAMCFG obt;
965	rc = alsaStreamOpen(true /* fIn */, &req, &obt, &phPCM);
966	if (RT_FAILURE(rc))
967	break;
968
969	pCfgAcq->Props.uHz = obt.freq;
970	pCfgAcq->Props.cChannels = obt.nchannels;
971
972	rc = alsaALSAToAudioProps(obt.fmt, &pCfgAcq->Props);
973	if (RT_FAILURE(rc))
974	break;
975
976	pCfgAcq->Backend.cfPeriod = obt.period_size;
977	pCfgAcq->Backend.cfBufferSize = obt.buffer_size;
978	/* No pre-buffering. */
979
980	pStreamALSA->cbBuf = pCfgAcq->Backend.cfBufferSize * DrvAudioHlpPCMPropsBytesPerFrame(&pCfgAcq->Props);
981	pStreamALSA->pvBuf = RTMemAlloc(pStreamALSA->cbBuf);
982	if (!pStreamALSA->pvBuf)
983	{
984	LogRel(("ALSA: Not enough memory for input ADC buffer (%zu frames)\n", pCfgAcq->Backend.cfBufferSize));
985	rc = VERR_NO_MEMORY;
986	break;
987	}
988
989	pStreamALSA->phPCM = phPCM;
990	}
991	while (0);
992
993	if (RT_FAILURE(rc))
994	alsaStreamClose(&phPCM);
995
996	LogFlowFuncLeaveRC(rc);
997	return rc;
998	}
999
1000
1001	static int alsaControlStreamIn(PALSAAUDIOSTREAM pStreamALSA, PDMAUDIOSTREAMCMD enmStreamCmd)
1002	{
1003	int rc = VINF_SUCCESS;
1004
1005	int err;
1006
1007	switch (enmStreamCmd)
1008	{
1009	case PDMAUDIOSTREAMCMD_ENABLE:
1010	case PDMAUDIOSTREAMCMD_RESUME:
1011	{
1012	err = snd_pcm_prepare(pStreamALSA->phPCM);
1013	if (err < 0)
1014	{
1015	LogRel(("ALSA: Error preparing input stream: %s\n", snd_strerror(err)));
1016	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1017	}
1018	else
1019	{
1020	Assert(snd_pcm_state(pStreamALSA->phPCM) == SND_PCM_STATE_PREPARED);
1021
1022	/* Only start the PCM stream for input streams. */
1023	err = snd_pcm_start(pStreamALSA->phPCM);
1024	if (err < 0)
1025	{
1026	LogRel(("ALSA: Error starting input stream: %s\n", snd_strerror(err)));
1027	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1028	}
1029	}
1030
1031	break;
1032	}
1033
1034	case PDMAUDIOSTREAMCMD_DISABLE:
1035	{
1036	err = snd_pcm_drop(pStreamALSA->phPCM);
1037	if (err < 0)
1038	{
1039	LogRel(("ALSA: Error disabling input stream: %s\n", snd_strerror(err)));
1040	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1041	}
1042	break;
1043	}
1044
1045	case PDMAUDIOSTREAMCMD_PAUSE:
1046	{
1047	err = snd_pcm_drop(pStreamALSA->phPCM);
1048	if (err < 0)
1049	{
1050	LogRel(("ALSA: Error pausing input stream: %s\n", snd_strerror(err)));
1051	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1052	}
1053	break;
1054	}
1055
1056	default:
1057	rc = VERR_NOT_SUPPORTED;
1058	break;
1059	}
1060
1061	LogFlowFuncLeaveRC(rc);
1062	return rc;
1063	}
1064
1065
1066	static int alsaControlStreamOut(PALSAAUDIOSTREAM pStreamALSA, PDMAUDIOSTREAMCMD enmStreamCmd)
1067	{
1068	int rc = VINF_SUCCESS;
1069
1070	int err;
1071
1072	switch (enmStreamCmd)
1073	{
1074	case PDMAUDIOSTREAMCMD_ENABLE:
1075	case PDMAUDIOSTREAMCMD_RESUME:
1076	{
1077	err = snd_pcm_prepare(pStreamALSA->phPCM);
1078	if (err < 0)
1079	{
1080	LogRel(("ALSA: Error preparing output stream: %s\n", snd_strerror(err)));
1081	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1082	}
1083	else
1084	{
1085	Assert(snd_pcm_state(pStreamALSA->phPCM) == SND_PCM_STATE_PREPARED);
1086	}
1087
1088	break;
1089	}
1090
1091	case PDMAUDIOSTREAMCMD_DISABLE:
1092	{
1093	err = snd_pcm_drop(pStreamALSA->phPCM);
1094	if (err < 0)
1095	{
1096	LogRel(("ALSA: Error disabling output stream: %s\n", snd_strerror(err)));
1097	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1098	}
1099	break;
1100	}
1101
1102	case PDMAUDIOSTREAMCMD_PAUSE:
1103	{
1104	err = snd_pcm_drop(pStreamALSA->phPCM);
1105	if (err < 0)
1106	{
1107	LogRel(("ALSA: Error pausing output stream: %s\n", snd_strerror(err)));
1108	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1109	}
1110	break;
1111	}
1112
1113	case PDMAUDIOSTREAMCMD_DRAIN:
1114	{
1115	snd_pcm_state_t streamState = snd_pcm_state(pStreamALSA->phPCM);
1116	Log2Func(("Stream state is: %d\n", streamState));
1117
1118	if ( streamState == SND_PCM_STATE_PREPARED
1119	\|\| streamState == SND_PCM_STATE_RUNNING)
1120	{
1121	err = snd_pcm_nonblock(pStreamALSA->phPCM, 0);
1122	if (err < 0)
1123	{
1124	LogRel(("ALSA: Error disabling output non-blocking mode: %s\n", snd_strerror(err)));
1125	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1126	break;
1127	}
1128
1129	err = snd_pcm_drain(pStreamALSA->phPCM);
1130	if (err < 0)
1131	{
1132	LogRel(("ALSA: Error draining output: %s\n", snd_strerror(err)));
1133	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1134	break;
1135	}
1136
1137	err = snd_pcm_nonblock(pStreamALSA->phPCM, 1);
1138	if (err < 0)
1139	{
1140	LogRel(("ALSA: Error re-enabling output non-blocking mode: %s\n", snd_strerror(err)));
1141	rc = VERR_ACCESS_DENIED; /** @todo Find a better rc. */
1142	}
1143	}
1144	break;
1145	}
1146
1147	default:
1148	rc = VERR_NOT_SUPPORTED;
1149	break;
1150	}
1151
1152	LogFlowFuncLeaveRC(rc);
1153	return rc;
1154	}
1155
1156
1157	/**
1158	* @interface_method_impl{PDMIHOSTAUDIO,pfnGetConfig}
1159	*/
1160	static DECLCALLBACK(int) drvHostALSAAudioGetConfig(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDCFG pBackendCfg)
1161	{
1162	RT_NOREF(pInterface);
1163	AssertPtrReturn(pBackendCfg, VERR_INVALID_POINTER);
1164
1165	RTStrPrintf2(pBackendCfg->szName, sizeof(pBackendCfg->szName), "ALSA audio driver");
1166
1167	pBackendCfg->cbStreamIn = sizeof(ALSAAUDIOSTREAM);
1168	pBackendCfg->cbStreamOut = sizeof(ALSAAUDIOSTREAM);
1169
1170	/* Enumerate sound devices. */
1171	char **pszHints;
1172	int err = snd_device_name_hint(-1 /* All cards /, "pcm", (void**)&pszHints);
1173	if (err == 0)
1174	{
1175	char** pszHintCur = pszHints;
1176	while (*pszHintCur != NULL)
1177	{
1178	char pszDev = snd_device_name_get_hint(pszHintCur, "NAME");
1179	bool fSkip = !pszDev
1180	\|\| !RTStrICmp("null", pszDev);
1181	if (fSkip)
1182	{
1183	if (pszDev)
1184	free(pszDev);
1185	pszHintCur++;
1186	continue;
1187	}
1188
1189	char pszIOID = snd_device_name_get_hint(pszHintCur, "IOID");
1190	if (pszIOID)
1191	{
1192	#if 0
1193	if (!RTStrICmp("input", pszIOID))
1194
1195	else if (!RTStrICmp("output", pszIOID))
1196	#endif
1197	}
1198	else /* NULL means bidirectional, input + output. */
1199	{
1200	}
1201
1202	LogRel2(("ALSA: Found %s device: %s\n", pszIOID ? RTStrToLower(pszIOID) : "bidirectional", pszDev));
1203
1204	/* Special case for ALSAAudio. */
1205	if ( pszDev
1206	&& RTStrIStr("pulse", pszDev) != NULL)
1207	LogRel2(("ALSA: ALSAAudio plugin in use\n"));
1208
1209	if (pszIOID)
1210	free(pszIOID);
1211
1212	if (pszDev)
1213	free(pszDev);
1214
1215	pszHintCur++;
1216	}
1217
1218	snd_device_name_free_hint((void **)pszHints);
1219	pszHints = NULL;
1220	}
1221	else
1222	LogRel2(("ALSA: Error enumerating PCM devices: %Rrc (%d)\n", RTErrConvertFromErrno(err), err));
1223
1224	/* ALSA allows exactly one input and one output used at a time for the selected device(s). */
1225	pBackendCfg->cMaxStreamsIn = 1;
1226	pBackendCfg->cMaxStreamsOut = 1;
1227
1228	return VINF_SUCCESS;
1229	}
1230
1231
1232	/**
1233	* @interface_method_impl{PDMIHOSTAUDIO,pfnShutdown}
1234	*/
1235	static DECLCALLBACK(void) drvHostALSAAudioShutdown(PPDMIHOSTAUDIO pInterface)
1236	{
1237	RT_NOREF(pInterface);
1238	}
1239
1240
1241	/**
1242	* @interface_method_impl{PDMIHOSTAUDIO,pfnGetStatus}
1243	*/
1244	static DECLCALLBACK(PDMAUDIOBACKENDSTS) drvHostALSAAudioGetStatus(PPDMIHOSTAUDIO pInterface, PDMAUDIODIR enmDir)
1245	{
1246	RT_NOREF(enmDir);
1247	AssertPtrReturn(pInterface, PDMAUDIOBACKENDSTS_UNKNOWN);
1248
1249	return PDMAUDIOBACKENDSTS_RUNNING;
1250	}
1251
1252
1253	/**
1254	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamCreate}
1255	*/
1256	static DECLCALLBACK(int) drvHostALSAAudioStreamCreate(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream,
1257	PPDMAUDIOSTREAMCFG pCfgReq, PPDMAUDIOSTREAMCFG pCfgAcq)
1258	{
1259	AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
1260	AssertPtrReturn(pStream, VERR_INVALID_POINTER);
1261	AssertPtrReturn(pCfgReq, VERR_INVALID_POINTER);
1262	AssertPtrReturn(pCfgAcq, VERR_INVALID_POINTER);
1263
1264	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
1265
1266	int rc;
1267	if (pCfgReq->enmDir == PDMAUDIODIR_IN)
1268	rc = alsaCreateStreamIn (pStreamALSA, pCfgReq, pCfgAcq);
1269	else
1270	rc = alsaCreateStreamOut(pStreamALSA, pCfgReq, pCfgAcq);
1271
1272	if (RT_SUCCESS(rc))
1273	{
1274	pStreamALSA->pCfg = DrvAudioHlpStreamCfgDup(pCfgAcq);
1275	if (!pStreamALSA->pCfg)
1276	rc = VERR_NO_MEMORY;
1277	}
1278
1279	return rc;
1280	}
1281
1282
1283	/**
1284	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamDestroy}
1285	*/
1286	static DECLCALLBACK(int) drvHostALSAAudioStreamDestroy(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
1287	{
1288	AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
1289	AssertPtrReturn(pStream, VERR_INVALID_POINTER);
1290
1291	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
1292
1293	if (!pStreamALSA->pCfg) /* Not (yet) configured? Skip. */
1294	return VINF_SUCCESS;
1295
1296	int rc;
1297	if (pStreamALSA->pCfg->enmDir == PDMAUDIODIR_IN)
1298	rc = alsaDestroyStreamIn(pStreamALSA);
1299	else
1300	rc = alsaDestroyStreamOut(pStreamALSA);
1301
1302	if (RT_SUCCESS(rc))
1303	{
1304	DrvAudioHlpStreamCfgFree(pStreamALSA->pCfg);
1305	pStreamALSA->pCfg = NULL;
1306	}
1307
1308	return rc;
1309	}
1310
1311
1312	/**
1313	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamControl}
1314	*/
1315	static DECLCALLBACK(int) drvHostALSAAudioStreamControl(PPDMIHOSTAUDIO pInterface,
1316	PPDMAUDIOBACKENDSTREAM pStream, PDMAUDIOSTREAMCMD enmStreamCmd)
1317	{
1318	AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
1319	AssertPtrReturn(pStream, VERR_INVALID_POINTER);
1320
1321	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
1322
1323	if (!pStreamALSA->pCfg) /* Not (yet) configured? Skip. */
1324	return VINF_SUCCESS;
1325
1326	int rc;
1327	if (pStreamALSA->pCfg->enmDir == PDMAUDIODIR_IN)
1328	rc = alsaControlStreamIn (pStreamALSA, enmStreamCmd);
1329	else
1330	rc = alsaControlStreamOut(pStreamALSA, enmStreamCmd);
1331
1332	return rc;
1333	}
1334
1335
1336	/**
1337	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetReadable}
1338	*/
1339	static DECLCALLBACK(uint32_t) drvHostALSAAudioStreamGetReadable(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
1340	{
1341	RT_NOREF(pInterface);
1342
1343	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
1344
1345	uint32_t cbAvail = 0;
1346
1347	snd_pcm_sframes_t cFramesAvail;
1348	int rc = alsaStreamGetAvail(pStreamALSA->phPCM, &cFramesAvail);
1349	if (RT_SUCCESS(rc))
1350	cbAvail = PDMAUDIOSTREAMCFG_F2B(pStreamALSA->pCfg, cFramesAvail);
1351
1352	return cbAvail;
1353	}
1354
1355
1356	/**
1357	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetWritable}
1358	*/
1359	static DECLCALLBACK(uint32_t) drvHostALSAAudioStreamGetWritable(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
1360	{
1361	RT_NOREF(pInterface);
1362
1363	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
1364
1365	uint32_t cbAvail = 0;
1366
1367	snd_pcm_sframes_t cFramesAvail;
1368	int rc = alsaStreamGetAvail(pStreamALSA->phPCM, &cFramesAvail);
1369	if (RT_SUCCESS(rc))
1370	cbAvail = PDMAUDIOSTREAMCFG_F2B(pStreamALSA->pCfg, cFramesAvail);
1371
1372	return cbAvail;
1373	}
1374
1375
1376	/**
1377	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetPending}
1378	*/
1379	static DECLCALLBACK(uint32_t) drvHostALSAStreamGetPending(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
1380	{
1381	RT_NOREF(pInterface);
1382	AssertPtrReturn(pStream, 0);
1383
1384	PALSAAUDIOSTREAM pStreamALSA = (PALSAAUDIOSTREAM)pStream;
1385
1386	snd_pcm_sframes_t cfDelay = 0;
1387	snd_pcm_state_t enmState = snd_pcm_state(pStreamALSA->phPCM);
1388
1389	int rc = VINF_SUCCESS;
1390
1391	AssertPtr(pStreamALSA->pCfg);
1392	if (pStreamALSA->pCfg->enmDir == PDMAUDIODIR_OUT)
1393	{
1394	/* Getting the delay (in audio frames) reports the time it will take
1395	* to hear a new sample after all queued samples have been played out. */
1396	int rc2 = snd_pcm_delay(pStreamALSA->phPCM, &cfDelay);
1397	if (RT_SUCCESS(rc))
1398	rc = rc2;
1399
1400	/* Make sure to check the stream's status.
1401	* If it's anything but SND_PCM_STATE_RUNNING, the delay is meaningless and therefore 0. */
1402	if (enmState != SND_PCM_STATE_RUNNING)
1403	cfDelay = 0;
1404	}
1405
1406	/* Note: For input streams we never have pending data left. */
1407
1408	Log2Func(("cfDelay=%RI32, enmState=%d, rc=%d\n", cfDelay, enmState, rc));
1409
1410	return DrvAudioHlpFramesToBytes(cfDelay, &pStreamALSA->pCfg->Props);
1411	}
1412
1413
1414	/**
1415	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetStatus}
1416	*/
1417	static DECLCALLBACK(PDMAUDIOSTREAMSTS) drvHostALSAAudioStreamGetStatus(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
1418	{
1419	RT_NOREF(pInterface, pStream);
1420
1421	return (PDMAUDIOSTREAMSTS_FLAG_INITIALIZED \| PDMAUDIOSTREAMSTS_FLAG_ENABLED);
1422	}
1423
1424
1425	/**
1426	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamIterate}
1427	*/
1428	static DECLCALLBACK(int) drvHostALSAAudioStreamIterate(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
1429	{
1430	AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
1431	AssertPtrReturn(pStream, VERR_INVALID_POINTER);
1432
1433	LogFlowFuncEnter();
1434
1435	/* Nothing to do here for ALSA. */
1436	return VINF_SUCCESS;
1437	}
1438
1439
1440	/**
1441	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
1442	*/
1443	static DECLCALLBACK(void ) drvHostALSAAudioQueryInterface(PPDMIBASE pInterface, const char pszIID)
1444	{
1445	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1446	PDRVHOSTALSAAUDIO pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTALSAAUDIO);
1447	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1448	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIHOSTAUDIO, &pThis->IHostAudio);
1449
1450	return NULL;
1451	}
1452
1453
1454	/**
1455	* Construct a DirectSound Audio driver instance.
1456	*
1457	* @copydoc FNPDMDRVCONSTRUCT
1458	*/
1459	static DECLCALLBACK(int) drvHostAlsaAudioConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1460	{
1461	RT_NOREF(pCfg, fFlags);
1462	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1463	PDRVHOSTALSAAUDIO pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTALSAAUDIO);
1464	LogRel(("Audio: Initializing ALSA driver\n"));
1465
1466	/*
1467	* Init the static parts.
1468	*/
1469	pThis->pDrvIns = pDrvIns;
1470	/* IBase */
1471	pDrvIns->IBase.pfnQueryInterface = drvHostALSAAudioQueryInterface;
1472	/* IHostAudio */
1473	PDMAUDIO_IHOSTAUDIO_CALLBACKS(drvHostALSAAudio);
1474	pThis->IHostAudio.pfnStreamGetPending = drvHostALSAStreamGetPending;
1475
1476	return VINF_SUCCESS;
1477	}
1478
1479
1480	/**
1481	* Char driver registration record.
1482	*/
1483	const PDMDRVREG g_DrvHostALSAAudio =
1484	{
1485	/* u32Version */
1486	PDM_DRVREG_VERSION,
1487	/* szName */
1488	"ALSAAudio",
1489	/* szRCMod */
1490	"",
1491	/* szR0Mod */
1492	"",
1493	/* pszDescription */
1494	"ALSA host audio driver",
1495	/* fFlags */
1496	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1497	/* fClass. */
1498	PDM_DRVREG_CLASS_AUDIO,
1499	/* cMaxInstances */
1500	~0U,
1501	/* cbInstance */
1502	sizeof(DRVHOSTALSAAUDIO),
1503	/* pfnConstruct */
1504	drvHostAlsaAudioConstruct,
1505	/* pfnDestruct */
1506	NULL,
1507	/* pfnRelocate */
1508	NULL,
1509	/* pfnIOCtl */
1510	NULL,
1511	/* pfnPowerOn */
1512	NULL,
1513	/* pfnReset */
1514	NULL,
1515	/* pfnSuspend */
1516	NULL,
1517	/* pfnResume */
1518	NULL,
1519	/* pfnAttach */
1520	NULL,
1521	/* pfnDetach */
1522	NULL,
1523	/* pfnPowerOff */
1524	NULL,
1525	/* pfnSoftReset */
1526	NULL,
1527	/* u32EndVersion */
1528	PDM_DRVREG_VERSION
1529	};
1530

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source: vbox/trunk/src/VBox/Devices/Audio/DrvHostALSAAudio.cpp@ 78135

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