DrvHostAudioOss.cpp

Last change on this file was 106061, checked in by vboxsync, 7 weeks ago
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1	/* $Id: DrvHostAudioOss.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* Host audio driver - OSS (Open Sound System).
4	*/
5
6	/*
7	* Copyright (C) 2014-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#include <errno.h>
33	#include <fcntl.h>
34	#include <sys/ioctl.h>
35	#include <sys/mman.h>
36	#include <sys/soundcard.h>
37	#include <unistd.h>
38
39	#include <iprt/alloc.h>
40	#include <iprt/thread.h>
41	#include <iprt/uuid.h> /* For PDMIBASE_2_PDMDRV. */
42
43	#define LOG_GROUP LOG_GROUP_DRV_HOST_AUDIO
44	#include <VBox/log.h>
45	#include <VBox/vmm/pdmaudioifs.h>
46	#include <VBox/vmm/pdmaudioinline.h>
47
48	#include "VBoxDD.h"
49
50
51	/*********************************************************************************************************************************
52	* Defines *
53	*********************************************************************************************************************************/
54	#if ((SOUND_VERSION > 360) && (defined(OSS_SYSINFO)))
55	/* OSS > 3.6 has a new syscall available for querying a bit more detailed information
56	* about OSS' audio capabilities. This is handy for e.g. Solaris. */
57	# define VBOX_WITH_AUDIO_OSS_SYSINFO 1
58	#endif
59
60
61	/*********************************************************************************************************************************
62	* Structures *
63	*********************************************************************************************************************************/
64	/**
65	* OSS audio stream configuration.
66	*/
67	typedef struct DRVHSTAUDOSSSTREAMCFG
68	{
69	PDMAUDIOPCMPROPS Props;
70	uint16_t cFragments;
71	/** The log2 of cbFragment. */
72	uint16_t cbFragmentLog2;
73	uint32_t cbFragment;
74	} DRVHSTAUDOSSSTREAMCFG;
75	/** Pointer to an OSS audio stream configuration. */
76	typedef DRVHSTAUDOSSSTREAMCFG *PDRVHSTAUDOSSSTREAMCFG;
77
78	/**
79	* OSS audio stream.
80	*/
81	typedef struct DRVHSTAUDOSSSTREAM
82	{
83	/** Common part. */
84	PDMAUDIOBACKENDSTREAM Core;
85	/** The file descriptor. */
86	int hFile;
87	/** Buffer alignment. */
88	uint8_t uAlign;
89	/** Set if we're draining the stream (output only). */
90	bool fDraining;
91	/** Internal stream byte offset. */
92	uint64_t offInternal;
93	/** The stream's acquired configuration. */
94	PDMAUDIOSTREAMCFG Cfg;
95	/** The acquired OSS configuration. */
96	DRVHSTAUDOSSSTREAMCFG OssCfg;
97	/** Handle to the thread draining output streams. */
98	RTTHREAD hThreadDrain;
99	} DRVHSTAUDOSSSTREAM;
100	/** Pointer to an OSS audio stream. */
101	typedef DRVHSTAUDOSSSTREAM *PDRVHSTAUDOSSSTREAM;
102
103	/**
104	* OSS host audio driver instance data.
105	* @implements PDMIAUDIOCONNECTOR
106	*/
107	typedef struct DRVHSTAUDOSS
108	{
109	/** Pointer to the driver instance structure. */
110	PPDMDRVINS pDrvIns;
111	/** Pointer to host audio interface. */
112	PDMIHOSTAUDIO IHostAudio;
113	/** Error count for not flooding the release log.
114	* UINT32_MAX for unlimited logging. */
115	uint32_t cLogErrors;
116	} DRVHSTAUDOSS;
117	/** Pointer to the instance data for an OSS host audio driver. */
118	typedef DRVHSTAUDOSS *PDRVHSTAUDOSS;
119
120
121	/*********************************************************************************************************************************
122	* Global Variables *
123	*********************************************************************************************************************************/
124	/** The path to the output OSS device. */
125	static char g_szPathOutputDev[] = "/dev/dsp";
126	/** The path to the input OSS device. */
127	static char g_szPathInputDev[] = "/dev/dsp";
128
129
130
131	static int drvHstAudOssToPdmAudioProps(PPDMAUDIOPCMPROPS pProps, int fmt, int cChannels, int uHz)
132	{
133	switch (fmt)
134	{
135	case AFMT_S8:
136	PDMAudioPropsInit(pProps, 1 /8-bit/, true /signed/, cChannels, uHz);
137	break;
138
139	case AFMT_U8:
140	PDMAudioPropsInit(pProps, 1 /8-bit/, false /signed/, cChannels, uHz);
141	break;
142
143	case AFMT_S16_LE:
144	PDMAudioPropsInitEx(pProps, 2 /16-bit/, true /signed/, cChannels, uHz, true /fLittleEndian/, false /fRaw/);
145	break;
146
147	case AFMT_U16_LE:
148	PDMAudioPropsInitEx(pProps, 2 /16-bit/, false /signed/, cChannels, uHz, true /fLittleEndian/, false /fRaw/);
149	break;
150
151	case AFMT_S16_BE:
152	PDMAudioPropsInitEx(pProps, 2 /16-bit/, true /signed/, cChannels, uHz, false /fLittleEndian/, false /fRaw/);
153	break;
154
155	case AFMT_U16_BE:
156	PDMAudioPropsInitEx(pProps, 2 /16-bit/, false /signed/, cChannels, uHz, false /fLittleEndian/, false /fRaw/);
157	break;
158
159	default:
160	AssertMsgFailedReturn(("Format %d not supported\n", fmt), VERR_NOT_SUPPORTED);
161	}
162
163	return VINF_SUCCESS;
164	}
165
166
167	static int drvHstAudOssStreamClose(int *phFile)
168	{
169	if (!phFile \|\| !phFile \|\| phFile == -1)
170	return VINF_SUCCESS;
171
172	int rc;
173	if (close(*phFile))
174	{
175	rc = RTErrConvertFromErrno(errno);
176	LogRel(("OSS: Closing stream failed: %s / %Rrc\n", strerror(errno), rc));
177	}
178	else
179	{
180	*phFile = -1;
181	rc = VINF_SUCCESS;
182	}
183
184	return rc;
185	}
186
187
188	/**
189	* @interface_method_impl{PDMIHOSTAUDIO,pfnGetConfig}
190	*/
191	static DECLCALLBACK(int) drvHstAudOssHA_GetConfig(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDCFG pBackendCfg)
192	{
193	RT_NOREF(pInterface);
194
195	/*
196	* Fill in the config structure.
197	*/
198	RTStrCopy(pBackendCfg->szName, sizeof(pBackendCfg->szName), "OSS");
199	pBackendCfg->cbStream = sizeof(DRVHSTAUDOSSSTREAM);
200	pBackendCfg->fFlags = 0;
201	pBackendCfg->cMaxStreamsIn = 0;
202	pBackendCfg->cMaxStreamsOut = 0;
203
204	int hFile = open("/dev/dsp", O_WRONLY \| O_NONBLOCK, 0);
205	if (hFile == -1)
206	{
207	/* Try opening the mixing device instead. */
208	hFile = open("/dev/mixer", O_RDONLY \| O_NONBLOCK, 0);
209	}
210	if (hFile != -1)
211	{
212	int ossVer = -1;
213	int err = ioctl(hFile, OSS_GETVERSION, &ossVer);
214	if (err == 0)
215	{
216	LogRel2(("OSS: Using version: %d\n", ossVer));
217	#ifdef VBOX_WITH_AUDIO_OSS_SYSINFO
218	oss_sysinfo ossInfo;
219	RT_ZERO(ossInfo);
220	err = ioctl(hFile, OSS_SYSINFO, &ossInfo);
221	if (err == 0)
222	{
223	LogRel2(("OSS: Number of DSPs: %d\n", ossInfo.numaudios));
224	LogRel2(("OSS: Number of mixers: %d\n", ossInfo.nummixers));
225
226	int cDev = ossInfo.nummixers;
227	if (!cDev)
228	cDev = ossInfo.numaudios;
229
230	pBackendCfg->cMaxStreamsIn = UINT32_MAX;
231	pBackendCfg->cMaxStreamsOut = UINT32_MAX;
232	}
233	else
234	#endif
235	{
236	/* Since we cannot query anything, assume that we have at least
237	* one input and one output if we found "/dev/dsp" or "/dev/mixer". */
238
239	pBackendCfg->cMaxStreamsIn = UINT32_MAX;
240	pBackendCfg->cMaxStreamsOut = UINT32_MAX;
241	}
242	}
243	else
244	LogRel(("OSS: Unable to determine installed version: %s (%d)\n", strerror(err), err));
245	close(hFile);
246	}
247	else
248	LogRel(("OSS: No devices found, audio is not available\n"));
249
250	return VINF_SUCCESS;
251	}
252
253
254	/**
255	* @interface_method_impl{PDMIHOSTAUDIO,pfnGetStatus}
256	*/
257	static DECLCALLBACK(PDMAUDIOBACKENDSTS) drvHstAudOssHA_GetStatus(PPDMIHOSTAUDIO pInterface, PDMAUDIODIR enmDir)
258	{
259	AssertPtrReturn(pInterface, PDMAUDIOBACKENDSTS_UNKNOWN);
260	RT_NOREF(enmDir);
261
262	return PDMAUDIOBACKENDSTS_RUNNING;
263	}
264
265
266	static int drvHstAudOssStreamConfigure(int hFile, bool fInput, PDRVHSTAUDOSSSTREAMCFG pOSSReq, PDRVHSTAUDOSSSTREAMCFG pOSSAcq)
267	{
268	/*
269	* Format.
270	*/
271	int iFormat;
272	switch (PDMAudioPropsSampleSize(&pOSSReq->Props))
273	{
274	case 1:
275	iFormat = pOSSReq->Props.fSigned ? AFMT_S8 : AFMT_U8;
276	break;
277
278	case 2:
279	if (PDMAudioPropsIsLittleEndian(&pOSSReq->Props))
280	iFormat = pOSSReq->Props.fSigned ? AFMT_S16_LE : AFMT_U16_LE;
281	else
282	iFormat = pOSSReq->Props.fSigned ? AFMT_S16_BE : AFMT_U16_BE;
283	break;
284
285	default:
286	LogRel2(("OSS: Unsupported sample size: %u\n", PDMAudioPropsSampleSize(&pOSSReq->Props)));
287	return VERR_AUDIO_STREAM_COULD_NOT_CREATE;
288	}
289	AssertLogRelMsgReturn(ioctl(hFile, SNDCTL_DSP_SAMPLESIZE, &iFormat) >= 0,
290	("OSS: Failed to set audio format to %d: %s (%d)\n", iFormat, strerror(errno), errno),
291	RTErrConvertFromErrno(errno));
292
293	/*
294	* Channel count.
295	*/
296	int cChannels = PDMAudioPropsChannels(&pOSSReq->Props);
297	AssertLogRelMsgReturn(ioctl(hFile, SNDCTL_DSP_CHANNELS, &cChannels) >= 0,
298	("OSS: Failed to set number of audio channels (%RU8): %s (%d)\n",
299	PDMAudioPropsChannels(&pOSSReq->Props), strerror(errno), errno),
300	RTErrConvertFromErrno(errno));
301
302	/*
303	* Frequency.
304	*/
305	int iFrequenc = pOSSReq->Props.uHz;
306	AssertLogRelMsgReturn(ioctl(hFile, SNDCTL_DSP_SPEED, &iFrequenc) >= 0,
307	("OSS: Failed to set audio frequency to %d Hz: %s (%d)\n", pOSSReq->Props.uHz, strerror(errno), errno),
308	RTErrConvertFromErrno(errno));
309
310	/*
311	* Set fragment size and count.
312	*/
313	LogRel2(("OSS: Requested %RU16 %s fragments, %RU32 bytes each\n",
314	pOSSReq->cFragments, fInput ? "input" : "output", pOSSReq->cbFragment));
315
316	int mmmmssss = (pOSSReq->cFragments << 16) \| pOSSReq->cbFragmentLog2;
317	AssertLogRelMsgReturn(ioctl(hFile, SNDCTL_DSP_SETFRAGMENT, &mmmmssss) >= 0,
318	("OSS: Failed to set %RU16 fragments to %RU32 bytes each: %s (%d)\n",
319	pOSSReq->cFragments, pOSSReq->cbFragment, strerror(errno), errno),
320	RTErrConvertFromErrno(errno));
321
322	/*
323	* Get parameters and popuplate pOSSAcq.
324	*/
325	audio_buf_info BufInfo = { 0, 0, 0, 0 };
326	AssertLogRelMsgReturn(ioctl(hFile, fInput ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &BufInfo) >= 0,
327	("OSS: Failed to retrieve %s buffer length: %s (%d)\n",
328	fInput ? "input" : "output", strerror(errno), errno),
329	RTErrConvertFromErrno(errno));
330
331	int rc = drvHstAudOssToPdmAudioProps(&pOSSAcq->Props, iFormat, cChannels, iFrequenc);
332	if (RT_SUCCESS(rc))
333	{
334	pOSSAcq->cFragments = BufInfo.fragstotal;
335	pOSSAcq->cbFragment = BufInfo.fragsize;
336	pOSSAcq->cbFragmentLog2 = ASMBitFirstSetU32(BufInfo.fragsize) - 1;
337	Assert(RT_BIT_32(pOSSAcq->cbFragmentLog2) == pOSSAcq->cbFragment);
338
339	LogRel2(("OSS: Got %RU16 %s fragments, %RU32 bytes each\n",
340	pOSSAcq->cFragments, fInput ? "input" : "output", pOSSAcq->cbFragment));
341	}
342
343	return rc;
344	}
345
346
347	/**
348	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamCreate}
349	*/
350	static DECLCALLBACK(int) drvHstAudOssHA_StreamCreate(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream,
351	PCPDMAUDIOSTREAMCFG pCfgReq, PPDMAUDIOSTREAMCFG pCfgAcq)
352	{
353	AssertPtr(pInterface); RT_NOREF(pInterface);
354	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
355	AssertPtrReturn(pStreamOSS, VERR_INVALID_POINTER);
356	AssertPtrReturn(pCfgReq, VERR_INVALID_POINTER);
357	AssertPtrReturn(pCfgAcq, VERR_INVALID_POINTER);
358
359	pStreamOSS->hThreadDrain = NIL_RTTHREAD;
360
361	/*
362	* Open the device
363	*/
364	int rc;
365	if (pCfgReq->enmDir == PDMAUDIODIR_IN)
366	pStreamOSS->hFile = open(g_szPathInputDev, O_RDONLY);
367	else
368	pStreamOSS->hFile = open(g_szPathOutputDev, O_WRONLY);
369	if (pStreamOSS->hFile >= 0)
370	{
371	/*
372	* Configure it.
373	*
374	* Note! We limit the output channels to mono or stereo for now just
375	* to keep things simple and avoid wasting time here. If the
376	* channel count isn't a power of two, our code below trips up
377	* on the fragment size. We'd also need to try report/get
378	* channel mappings and whatnot.
379	*/
380	DRVHSTAUDOSSSTREAMCFG ReqOssCfg;
381	RT_ZERO(ReqOssCfg);
382
383	memcpy(&ReqOssCfg.Props, &pCfgReq->Props, sizeof(PDMAUDIOPCMPROPS));
384	if (PDMAudioPropsChannels(&ReqOssCfg.Props) > 2)
385	{
386	LogRel2(("OSS: Limiting output to two channels, requested %u.\n", PDMAudioPropsChannels(&ReqOssCfg.Props) ));
387	PDMAudioPropsSetChannels(&ReqOssCfg.Props, 2);
388	}
389
390	ReqOssCfg.cbFragmentLog2 = 12;
391	ReqOssCfg.cbFragment = RT_BIT_32(ReqOssCfg.cbFragmentLog2);
392	uint32_t const cbBuffer = PDMAudioPropsFramesToBytes(&ReqOssCfg.Props, pCfgReq->Backend.cFramesBufferSize);
393	ReqOssCfg.cFragments = cbBuffer >> ReqOssCfg.cbFragmentLog2;
394	AssertLogRelStmt(cbBuffer < ((uint32_t)0x7ffe << ReqOssCfg.cbFragmentLog2), ReqOssCfg.cFragments = 0x7ffe);
395
396	rc = drvHstAudOssStreamConfigure(pStreamOSS->hFile, pCfgReq->enmDir == PDMAUDIODIR_IN, &ReqOssCfg, &pStreamOSS->OssCfg);
397	if (RT_SUCCESS(rc))
398	{
399	pStreamOSS->uAlign = 0; /** @todo r=bird: Where did the correct assignment of this go? */
400
401	/*
402	* Complete the stream structure and fill in the pCfgAcq bits.
403	*/
404	if ((pStreamOSS->OssCfg.cFragments * pStreamOSS->OssCfg.cbFragment) & pStreamOSS->uAlign)
405	LogRel(("OSS: Warning: Misaligned playback buffer: Size = %zu, Alignment = %u\n",
406	pStreamOSS->OssCfg.cFragments * pStreamOSS->OssCfg.cbFragment, pStreamOSS->uAlign + 1));
407
408	memcpy(&pCfgAcq->Props, &pStreamOSS->OssCfg.Props, sizeof(PDMAUDIOPCMPROPS));
409	pCfgAcq->Backend.cFramesPeriod = PDMAudioPropsBytesToFrames(&pCfgAcq->Props, pStreamOSS->OssCfg.cbFragment);
410	pCfgAcq->Backend.cFramesBufferSize = pCfgAcq->Backend.cFramesPeriod * pStreamOSS->OssCfg.cFragments;
411	pCfgAcq->Backend.cFramesPreBuffering = (uint64_t)pCfgReq->Backend.cFramesPreBuffering
412	* pCfgAcq->Backend.cFramesBufferSize
413	/ RT_MAX(pCfgReq->Backend.cFramesBufferSize, 1);
414
415	/*
416	* Copy the stream config and we're done!
417	*/
418	PDMAudioStrmCfgCopy(&pStreamOSS->Cfg, pCfgAcq);
419	return VINF_SUCCESS;
420	}
421	drvHstAudOssStreamClose(&pStreamOSS->hFile);
422	}
423	else
424	{
425	rc = RTErrConvertFromErrno(errno);
426	LogRel(("OSS: Failed to open '%s': %s (%d) / %Rrc\n",
427	pCfgReq->enmDir == PDMAUDIODIR_IN ? g_szPathInputDev : g_szPathOutputDev, strerror(errno), errno, rc));
428	}
429	return rc;
430	}
431
432
433	/**
434	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamDestroy}
435	*/
436	static DECLCALLBACK(int) drvHstAudOssHA_StreamDestroy(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, bool fImmediate)
437	{
438	RT_NOREF(pInterface, fImmediate);
439	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
440	AssertPtrReturn(pStreamOSS, VERR_INVALID_POINTER);
441
442	drvHstAudOssStreamClose(&pStreamOSS->hFile);
443
444	if (pStreamOSS->hThreadDrain != NIL_RTTHREAD)
445	{
446	int rc = RTThreadWait(pStreamOSS->hThreadDrain, 1, NULL);
447	AssertRC(rc);
448	pStreamOSS->hThreadDrain = NIL_RTTHREAD;
449	}
450
451	return VINF_SUCCESS;
452	}
453
454
455	/**
456	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamEnable}
457	*/
458	static DECLCALLBACK(int) drvHstAudOssHA_StreamEnable(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
459	{
460	RT_NOREF(pInterface);
461	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
462	int rc;
463
464	/*
465	* This is most probably untested...
466	*/
467	if (pStreamOSS->fDraining)
468	{
469	LogFlowFunc(("Still draining...\n"));
470	rc = RTThreadWait(pStreamOSS->hThreadDrain, 0 /ms/, NULL);
471	if (RT_FAILURE(rc))
472	{
473	LogFlowFunc(("Resetting...\n"));
474	ioctl(pStreamOSS->hFile, SNDCTL_DSP_RESET, NULL);
475	rc = RTThreadWait(pStreamOSS->hThreadDrain, 0 /ms/, NULL);
476	if (RT_FAILURE(rc))
477	{
478	LogFlowFunc(("Poking...\n"));
479	RTThreadPoke(pStreamOSS->hThreadDrain);
480	rc = RTThreadWait(pStreamOSS->hThreadDrain, 1 /ms/, NULL);
481	}
482	}
483	if (RT_SUCCESS(rc))
484	{
485	LogFlowFunc(("Done draining.\n"));
486	pStreamOSS->hThreadDrain = NIL_RTTHREAD;
487	}
488	else
489	LogFlowFunc(("No, still draining...\n"));
490	pStreamOSS->fDraining = false;
491	}
492
493	/*
494	* Enable the stream.
495	*/
496	int fMask = pStreamOSS->Cfg.enmDir == PDMAUDIODIR_IN ? PCM_ENABLE_INPUT : PCM_ENABLE_OUTPUT;
497	if (ioctl(pStreamOSS->hFile, SNDCTL_DSP_SETTRIGGER, &fMask) >= 0)
498	rc = VINF_SUCCESS;
499	else
500	{
501	LogRel(("OSS: Failed to enable output stream: %s (%d)\n", strerror(errno), errno));
502	rc = RTErrConvertFromErrno(errno);
503	}
504
505	LogFlowFunc(("returns %Rrc for '%s'\n", rc, pStreamOSS->Cfg.szName));
506	return rc;
507	}
508
509
510	/**
511	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamDisable}
512	*/
513	static DECLCALLBACK(int) drvHstAudOssHA_StreamDisable(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
514	{
515	RT_NOREF(pInterface);
516	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
517	LogFlowFunc(("Stream '%s'\n", pStreamOSS->Cfg.szName));
518	int rc;
519
520	/*
521	* If we're still draining, try kick the thread before we try disable the stream.
522	*/
523	if (pStreamOSS->fDraining)
524	{
525	LogFlowFunc(("Trying to cancel draining...\n"));
526	if (pStreamOSS->hThreadDrain != NIL_RTTHREAD)
527	{
528	RTThreadPoke(pStreamOSS->hThreadDrain);
529	rc = RTThreadWait(pStreamOSS->hThreadDrain, 1 /ms/, NULL);
530	if (RT_SUCCESS(rc) \|\| rc == VERR_INVALID_HANDLE)
531	pStreamOSS->fDraining = false;
532	else
533	LogFunc(("Failed to cancel draining (%Rrc)\n", rc));
534	}
535	else
536	{
537	LogFlowFunc(("Thread handle is NIL, so we can't be draining\n"));
538	pStreamOSS->fDraining = false;
539	}
540	}
541
542	/*
543	* The Official documentation says this isn't the right way to stop
544	* playback. It may work in some implementations but fail in all others...
545	* Suggest SNDCTL_DSP_RESET / SNDCTL_DSP_HALT.
546	*
547	* So, let's do both and see how that works out...
548	*/
549	rc = VINF_SUCCESS;
550	int fMask = 0;
551	if (ioctl(pStreamOSS->hFile, SNDCTL_DSP_SETTRIGGER, &fMask) >= 0)
552	LogFlowFunc(("SNDCTL_DSP_SETTRIGGER succeeded\n"));
553	else
554	{
555	LogRel(("OSS: Failed to clear triggers for stream '%s': %s (%d)\n", pStreamOSS->Cfg.szName, strerror(errno), errno));
556	rc = RTErrConvertFromErrno(errno);
557	}
558
559	if (ioctl(pStreamOSS->hFile, SNDCTL_DSP_RESET, NULL) >= 0)
560	LogFlowFunc(("SNDCTL_DSP_RESET succeeded\n"));
561	else
562	{
563	LogRel(("OSS: Failed to reset stream '%s': %s (%d)\n", pStreamOSS->Cfg.szName, strerror(errno), errno));
564	rc = RTErrConvertFromErrno(errno);
565	}
566
567	LogFlowFunc(("returns %Rrc for '%s'\n", rc, pStreamOSS->Cfg.szName));
568	return rc;
569	}
570
571
572	/**
573	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamPause}
574	*/
575	static DECLCALLBACK(int) drvHstAudOssHA_StreamPause(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
576	{
577	return drvHstAudOssHA_StreamDisable(pInterface, pStream);
578	}
579
580
581	/**
582	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamResume}
583	*/
584	static DECLCALLBACK(int) drvHstAudOssHA_StreamResume(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
585	{
586	return drvHstAudOssHA_StreamEnable(pInterface, pStream);
587	}
588
589
590	/**
591	* @callback_method_impl{FNRTTHREAD,
592	* Thread for calling SNDCTL_DSP_SYNC (blocking) on an output stream.}
593	*/
594	static DECLCALLBACK(int) drvHstAudOssDrainThread(RTTHREAD ThreadSelf, void *pvUser)
595	{
596	RT_NOREF(ThreadSelf);
597	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pvUser;
598	int rc;
599
600	/* Make it blocking (for Linux). */
601	int fOrgFlags = fcntl(pStreamOSS->hFile, F_GETFL, 0);
602	LogFunc(("F_GETFL -> %#x\n", fOrgFlags));
603	Assert(fOrgFlags != -1);
604	if (fOrgFlags != -1 && (fOrgFlags & O_NONBLOCK))
605	{
606	rc = fcntl(pStreamOSS->hFile, F_SETFL, fOrgFlags & ~O_NONBLOCK);
607	AssertStmt(rc != -1, fOrgFlags = -1);
608	}
609
610	/* Drain it. */
611	LogFunc(("Calling SNDCTL_DSP_SYNC now...\n"));
612	rc = ioctl(pStreamOSS->hFile, SNDCTL_DSP_SYNC, NULL);
613	LogFunc(("SNDCTL_DSP_SYNC returned %d / errno=%d\n", rc, errno)); RT_NOREF(rc);
614
615	/* Re-enable non-blocking mode and disable it. */
616	if (fOrgFlags != -1)
617	{
618	rc = fcntl(pStreamOSS->hFile, F_SETFL, fOrgFlags);
619	Assert(rc != -1);
620
621	int fMask = 0;
622	rc = ioctl(pStreamOSS->hFile, SNDCTL_DSP_SETTRIGGER, &fMask);
623	Assert(rc >= 0);
624
625	pStreamOSS->fDraining = false;
626	LogFunc(("Restored non-block mode and cleared the trigger mask\n"));
627	}
628
629	return VINF_SUCCESS;
630	}
631
632
633	/**
634	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamDrain}
635	*/
636	static DECLCALLBACK(int) drvHstAudOssHA_StreamDrain(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
637	{
638	PDRVHSTAUDOSS pThis = RT_FROM_MEMBER(pInterface, DRVHSTAUDOSS, IHostAudio);
639	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
640	AssertReturn(pStreamOSS->Cfg.enmDir == PDMAUDIODIR_OUT, VERR_WRONG_ORDER);
641
642	pStreamOSS->fDraining = true;
643
644	/*
645	* Because the SNDCTL_DSP_SYNC call is blocking on real OSS,
646	* we kick off a thread to deal with it as we're probably on EMT
647	* and cannot block for extended periods.
648	*/
649	if (pStreamOSS->hThreadDrain != NIL_RTTHREAD)
650	{
651	int rc = RTThreadWait(pStreamOSS->hThreadDrain, 0, NULL);
652	if (RT_SUCCESS(rc))
653	{
654	pStreamOSS->hThreadDrain = NIL_RTTHREAD;
655	LogFunc(("Cleaned up stale thread handle.\n"));
656	}
657	else
658	{
659	LogFunc(("Drain thread already running (%Rrc).\n", rc));
660	AssertMsg(rc == VERR_TIMEOUT, ("%Rrc\n", rc));
661	return rc == VERR_TIMEOUT ? VINF_SUCCESS : rc;
662	}
663	}
664
665	int rc = RTThreadCreateF(&pStreamOSS->hThreadDrain, drvHstAudOssDrainThread, pStreamOSS, 0,
666	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "ossdrai%u", pThis->pDrvIns->iInstance);
667	LogFunc(("Started drain thread: %Rrc\n", rc));
668	AssertRCReturn(rc, rc);
669
670	return VINF_SUCCESS;
671	}
672
673
674	/**
675	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetState}
676	*/
677	static DECLCALLBACK(PDMHOSTAUDIOSTREAMSTATE) drvHstAudOssHA_StreamGetState(PPDMIHOSTAUDIO pInterface,
678	PPDMAUDIOBACKENDSTREAM pStream)
679	{
680	RT_NOREF(pInterface);
681	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
682	AssertPtrReturn(pStreamOSS, PDMHOSTAUDIOSTREAMSTATE_INVALID);
683	if (!pStreamOSS->fDraining)
684	return PDMHOSTAUDIOSTREAMSTATE_OKAY;
685	return PDMHOSTAUDIOSTREAMSTATE_DRAINING;
686	}
687
688
689	/**
690	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetWritable}
691	*/
692	static DECLCALLBACK(uint32_t) drvHstAudOssHA_StreamGetWritable(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
693	{
694	RT_NOREF(pInterface);
695	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
696	AssertPtr(pStreamOSS);
697
698	/*
699	* The logic here must match what StreamPlay does.
700	*
701	* Note! We now use 'bytes' rather than the fragments * fragsize as we used
702	* to do (up to 2021), as these are documented as obsolete.
703	*/
704	audio_buf_info BufInfo = { 0, 0, 0, 0 };
705	int rc2 = ioctl(pStreamOSS->hFile, SNDCTL_DSP_GETOSPACE, &BufInfo);
706	AssertMsgReturn(rc2 >= 0, ("SNDCTL_DSP_GETOSPACE failed: %s (%d)\n", strerror(errno), errno), 0);
707
708	/* Try use the size. */
709	uint32_t cbRet;
710	uint32_t const cbBuf = pStreamOSS->OssCfg.cbFragment * pStreamOSS->OssCfg.cFragments;
711	if (BufInfo.bytes >= 0 && (unsigned)BufInfo.bytes <= cbBuf)
712	cbRet = BufInfo.bytes;
713	else
714	{
715	AssertMsgFailed(("Invalid available size: %d\n", BufInfo.bytes));
716	AssertMsgReturn(BufInfo.fragments >= 0, ("fragments: %d\n", BufInfo.fragments), 0);
717	AssertMsgReturn(BufInfo.fragsize >= 0, ("fragsize: %d\n", BufInfo.fragsize), 0);
718	cbRet = (uint32_t)(BufInfo.fragments * BufInfo.fragsize);
719	AssertMsgReturn(cbRet <= cbBuf, ("fragsize*fragments: %d, cbBuf=%#x\n", cbRet, cbBuf), 0);
720	}
721
722	Log4Func(("returns %#x (%u) [cbBuf=%#x]\n", cbRet, cbRet, cbBuf));
723	return cbRet;
724	}
725
726
727	/**
728	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamPlay}
729	*/
730	static DECLCALLBACK(int) drvHstAudOssHA_StreamPlay(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream,
731	const void pvBuf, uint32_t cbBuf, uint32_t pcbWritten)
732	{
733	RT_NOREF(pInterface);
734	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
735	AssertPtrReturn(pStreamOSS, VERR_INVALID_POINTER);
736
737	/*
738	* Return immediately if this is a draining service call.
739	*
740	* Otherwise the ioctl below will race the drain thread and sometimes fail,
741	* triggering annoying assertion and release logging.
742	*/
743	if (cbBuf \|\| !pStreamOSS->fDraining)
744	{ /* likely */ }
745	else
746	{
747	*pcbWritten = 0;
748	return VINF_SUCCESS;
749	}
750
751	/*
752	* Figure out now much to write (same as drvHstAudOssHA_StreamGetWritable,
753	* must match exactly).
754	*/
755	audio_buf_info BufInfo;
756	int rc2 = ioctl(pStreamOSS->hFile, SNDCTL_DSP_GETOSPACE, &BufInfo);
757	AssertLogRelMsgReturn(rc2 >= 0, ("OSS: Failed to retrieve current playback buffer: %s (%d, hFile=%d, rc2=%d)\n",
758	strerror(errno), errno, pStreamOSS->hFile, rc2),
759	RTErrConvertFromErrno(errno));
760
761	uint32_t cbToWrite;
762	uint32_t const cbStreamBuf = pStreamOSS->OssCfg.cbFragment * pStreamOSS->OssCfg.cFragments;
763	if (BufInfo.bytes >= 0 && (unsigned)BufInfo.bytes <= cbStreamBuf)
764	cbToWrite = BufInfo.bytes;
765	else
766	{
767	AssertMsgFailed(("Invalid available size: %d\n", BufInfo.bytes));
768	AssertMsgReturn(BufInfo.fragments >= 0, ("fragments: %d\n", BufInfo.fragments), 0);
769	AssertMsgReturn(BufInfo.fragsize >= 0, ("fragsize: %d\n", BufInfo.fragsize), 0);
770	cbToWrite = (uint32_t)(BufInfo.fragments * BufInfo.fragsize);
771	AssertMsgReturn(cbToWrite <= cbStreamBuf, ("fragsize*fragments: %d, cbStreamBuf=%#x\n", cbToWrite, cbStreamBuf), 0);
772	}
773
774	cbToWrite = RT_MIN(cbToWrite, cbBuf);
775	Log3Func(("@%#RX64 cbBuf=%#x BufInfo: fragments=%#x fragstotal=%#x fragsize=%#x bytes=%#x %s cbToWrite=%#x\n",
776	pStreamOSS->offInternal, cbBuf, BufInfo.fragments, BufInfo.fragstotal, BufInfo.fragsize, BufInfo.bytes,
777	pStreamOSS->Cfg.szName, cbToWrite));
778
779	/*
780	* Write.
781	*/
782	uint8_t const pbBuf = (uint8_t const )pvBuf;
783	uint32_t cbChunk = cbToWrite;
784	uint32_t offChunk = 0;
785	while (cbChunk > 0)
786	{
787	ssize_t cbWritten = write(pStreamOSS->hFile, &pbBuf[offChunk], RT_MIN(cbChunk, pStreamOSS->OssCfg.cbFragment));
788	if (cbWritten > 0)
789	{
790	AssertLogRelMsg(!(cbWritten & pStreamOSS->uAlign),
791	("OSS: Misaligned write (written %#zx, alignment %#x)\n", cbWritten, pStreamOSS->uAlign));
792
793	Assert((uint32_t)cbWritten <= cbChunk);
794	offChunk += (uint32_t)cbWritten;
795	cbChunk -= (uint32_t)cbWritten;
796	pStreamOSS->offInternal += cbWritten;
797	}
798	else if (cbWritten == 0)
799	{
800	LogFunc(("@%#RX64 write(%#x) returned zeroed (previously wrote %#x bytes)!\n",
801	pStreamOSS->offInternal, RT_MIN(cbChunk, pStreamOSS->OssCfg.cbFragment), cbWritten));
802	break;
803	}
804	else
805	{
806	LogRel(("OSS: Failed writing output data: %s (%d)\n", strerror(errno), errno));
807	return RTErrConvertFromErrno(errno);
808	}
809	}
810
811	*pcbWritten = offChunk;
812	return VINF_SUCCESS;
813	}
814
815
816	/**
817	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamGetReadable}
818	*/
819	static DECLCALLBACK(uint32_t) drvHstAudOssHA_StreamGetReadable(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)
820	{
821	RT_NOREF(pInterface);
822	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
823	AssertPtr(pStreamOSS);
824
825	/*
826	* Use SNDCTL_DSP_GETISPACE to see how much we can read.
827	*
828	* Note! We now use 'bytes' rather than the fragments * fragsize as we used
829	* to do (up to 2021), as these are documented as obsolete.
830	*/
831	audio_buf_info BufInfo = { 0, 0, 0, 0 };
832	int rc2 = ioctl(pStreamOSS->hFile, SNDCTL_DSP_GETISPACE, &BufInfo);
833	AssertMsgReturn(rc2 >= 0, ("SNDCTL_DSP_GETISPACE failed: %s (%d)\n", strerror(errno), errno), 0);
834
835	uint32_t cbRet;
836	uint32_t const cbBuf = pStreamOSS->OssCfg.cbFragment * pStreamOSS->OssCfg.cFragments;
837	if (BufInfo.bytes >= 0 && (unsigned)BufInfo.bytes <= cbBuf)
838	cbRet = BufInfo.bytes;
839	else
840	{
841	AssertMsgFailed(("Invalid available size: %d\n", BufInfo.bytes));
842	AssertMsgReturn(BufInfo.fragments >= 0, ("fragments: %d\n", BufInfo.fragments), 0);
843	AssertMsgReturn(BufInfo.fragsize >= 0, ("fragsize: %d\n", BufInfo.fragsize), 0);
844	cbRet = (uint32_t)(BufInfo.fragments * BufInfo.fragsize);
845	AssertMsgReturn(cbRet <= cbBuf, ("fragsize*fragments: %d, cbBuf=%#x\n", cbRet, cbBuf), 0);
846	}
847
848	/*
849	* HACK ALERT! To force the stream to start recording, we read a frame
850	* here if we get back that there are zero bytes available
851	* and we're at the start of the stream. (We cannot just
852	* return a frame size, we have to read it, as pre-buffering
853	* would prevent it from being read.)
854	*/
855	if (BufInfo.bytes > 0 \|\| pStreamOSS->offInternal != 0)
856	{ /* likely */ }
857	else
858	{
859	uint32_t cbToRead = PDMAudioPropsFramesToBytes(&pStreamOSS->Cfg.Props, 1);
860	uint8_t abFrame[256];
861	Assert(cbToRead < sizeof(abFrame));
862	ssize_t cbRead = read(pStreamOSS->hFile, abFrame, cbToRead);
863	RT_NOREF(cbRead);
864	LogFunc(("Dummy read for '%s' returns %zd (errno=%d)\n", pStreamOSS->Cfg.szName, cbRead, errno));
865	}
866
867	Log4Func(("returns %#x (%u) [cbBuf=%#x]\n", cbRet, cbRet, cbBuf));
868	return cbRet;
869	}
870
871
872	/**
873	* @interface_method_impl{PDMIHOSTAUDIO,pfnStreamCapture}
874	*/
875	static DECLCALLBACK(int) drvHstAudOssHA_StreamCapture(PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream,
876	void pvBuf, uint32_t cbBuf, uint32_t pcbRead)
877	{
878	RT_NOREF(pInterface);
879	PDRVHSTAUDOSSSTREAM pStreamOSS = (PDRVHSTAUDOSSSTREAM)pStream;
880	AssertPtrReturn(pStreamOSS, VERR_INVALID_POINTER);
881	Log3Func(("@%#RX64 cbBuf=%#x %s\n", pStreamOSS->offInternal, cbBuf, pStreamOSS->Cfg.szName));
882
883	size_t cbToRead = cbBuf;
884	uint8_t * const pbDst = (uint8_t *)pvBuf;
885	size_t offWrite = 0;
886	while (cbToRead > 0)
887	{
888	ssize_t cbRead = read(pStreamOSS->hFile, &pbDst[offWrite], cbToRead);
889	if (cbRead > 0)
890	{
891	LogFlowFunc(("cbRead=%zi, offWrite=%zu cbToRead=%zu\n", cbRead, offWrite, cbToRead));
892	Assert((ssize_t)cbToRead >= cbRead);
893	cbToRead -= cbRead;
894	offWrite += cbRead;
895	pStreamOSS->offInternal += cbRead;
896	}
897	else
898	{
899	LogFunc(("cbRead=%zi, offWrite=%zu cbToRead=%zu errno=%d\n", cbRead, offWrite, cbToRead, errno));
900
901	/* Don't complain about errors if we've retrieved some audio data already. */
902	if (cbRead < 0 && offWrite == 0 && errno != EINTR && errno != EAGAIN)
903	{
904	AssertStmt(errno != 0, errno = EACCES);
905	int rc = RTErrConvertFromErrno(errno);
906	LogFunc(("Failed to read %zu input frames, errno=%d rc=%Rrc\n", cbToRead, errno, rc));
907	return rc;
908	}
909	break;
910	}
911	}
912
913	*pcbRead = offWrite;
914	return VINF_SUCCESS;
915	}
916
917
918	/**
919	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
920	*/
921	static DECLCALLBACK(void ) drvHstAudOssQueryInterface(PPDMIBASE pInterface, const char pszIID)
922	{
923	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
924	PDRVHSTAUDOSS pThis = PDMINS_2_DATA(pDrvIns, PDRVHSTAUDOSS);
925
926	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
927	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIHOSTAUDIO, &pThis->IHostAudio);
928
929	return NULL;
930	}
931
932
933	/**
934	* @interface_method_impl{PDMDRVREG,pfnConstruct,
935	* Constructs an OSS audio driver instance.}
936	*/
937	static DECLCALLBACK(int) drvHstAudOssConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
938	{
939	RT_NOREF(pCfg, fFlags);
940	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
941	PDRVHSTAUDOSS pThis = PDMINS_2_DATA(pDrvIns, PDRVHSTAUDOSS);
942	LogRel(("Audio: Initializing OSS driver\n"));
943
944	/*
945	* Init the static parts.
946	*/
947	pThis->pDrvIns = pDrvIns;
948	/* IBase */
949	pDrvIns->IBase.pfnQueryInterface = drvHstAudOssQueryInterface;
950	/* IHostAudio */
951	pThis->IHostAudio.pfnGetConfig = drvHstAudOssHA_GetConfig;
952	pThis->IHostAudio.pfnGetDevices = NULL;
953	pThis->IHostAudio.pfnSetDevice = NULL;
954	pThis->IHostAudio.pfnGetStatus = drvHstAudOssHA_GetStatus;
955	pThis->IHostAudio.pfnDoOnWorkerThread = NULL;
956	pThis->IHostAudio.pfnStreamConfigHint = NULL;
957	pThis->IHostAudio.pfnStreamCreate = drvHstAudOssHA_StreamCreate;
958	pThis->IHostAudio.pfnStreamInitAsync = NULL;
959	pThis->IHostAudio.pfnStreamDestroy = drvHstAudOssHA_StreamDestroy;
960	pThis->IHostAudio.pfnStreamNotifyDeviceChanged = NULL;
961	pThis->IHostAudio.pfnStreamEnable = drvHstAudOssHA_StreamEnable;
962	pThis->IHostAudio.pfnStreamDisable = drvHstAudOssHA_StreamDisable;
963	pThis->IHostAudio.pfnStreamPause = drvHstAudOssHA_StreamPause;
964	pThis->IHostAudio.pfnStreamResume = drvHstAudOssHA_StreamResume;
965	pThis->IHostAudio.pfnStreamDrain = drvHstAudOssHA_StreamDrain;
966	pThis->IHostAudio.pfnStreamGetState = drvHstAudOssHA_StreamGetState;
967	pThis->IHostAudio.pfnStreamGetPending = NULL;
968	pThis->IHostAudio.pfnStreamGetWritable = drvHstAudOssHA_StreamGetWritable;
969	pThis->IHostAudio.pfnStreamPlay = drvHstAudOssHA_StreamPlay;
970	pThis->IHostAudio.pfnStreamGetReadable = drvHstAudOssHA_StreamGetReadable;
971	pThis->IHostAudio.pfnStreamCapture = drvHstAudOssHA_StreamCapture;
972
973	return VINF_SUCCESS;
974	}
975
976
977	/**
978	* OSS driver registration record.
979	*/
980	const PDMDRVREG g_DrvHostOSSAudio =
981	{
982	/* u32Version */
983	PDM_DRVREG_VERSION,
984	/* szName */
985	"OSSAudio",
986	/* szRCMod */
987	"",
988	/* szR0Mod */
989	"",
990	/* pszDescription */
991	"OSS audio host driver",
992	/* fFlags */
993	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
994	/* fClass. */
995	PDM_DRVREG_CLASS_AUDIO,
996	/* cMaxInstances */
997	~0U,
998	/* cbInstance */
999	sizeof(DRVHSTAUDOSS),
1000	/* pfnConstruct */
1001	drvHstAudOssConstruct,
1002	/* pfnDestruct */
1003	NULL,
1004	/* pfnRelocate */
1005	NULL,
1006	/* pfnIOCtl */
1007	NULL,
1008	/* pfnPowerOn */
1009	NULL,
1010	/* pfnReset */
1011	NULL,
1012	/* pfnSuspend */
1013	NULL,
1014	/* pfnResume */
1015	NULL,
1016	/* pfnAttach */
1017	NULL,
1018	/* pfnDetach */
1019	NULL,
1020	/* pfnPowerOff */
1021	NULL,
1022	/* pfnSoftReset */
1023	NULL,
1024	/* u32EndVersion */
1025	PDM_DRVREG_VERSION
1026	};
1027

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source: vbox/trunk/src/VBox/Devices/Audio/DrvHostAudioOss.cpp

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