pdmaudioifs.h@ 66581

Last change on this file since 66581 was 65695, checked in by vboxsync, 8 years ago
Audio: Adjusted PDMAUDIOSTRMSTS_VALID_MASK.
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1	/** @file
2	* PDM - Pluggable Device Manager, audio interfaces.
3	*/
4
5	/*
6	* Copyright (C) 2006-2017 Oracle Corporation
7	*
8	* This file is part of VirtualBox Open Source Edition (OSE), as
9	* available from http://www.virtualbox.org. This file is free software;
10	* you can redistribute it and/or modify it under the terms of the GNU
11	* General Public License (GPL) as published by the Free Software
12	* Foundation, in version 2 as it comes in the "COPYING" file of the
13	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	*
16	* The contents of this file may alternatively be used under the terms
17	* of the Common Development and Distribution License Version 1.0
18	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
19	* VirtualBox OSE distribution, in which case the provisions of the
20	* CDDL are applicable instead of those of the GPL.
21	*
22	* You may elect to license modified versions of this file under the
23	* terms and conditions of either the GPL or the CDDL or both.
24	*/
25
26	#ifndef ___VBox_vmm_pdmaudioifs_h
27	#define ___VBox_vmm_pdmaudioifs_h
28
29	#include <iprt/circbuf.h>
30	#include <iprt/list.h>
31
32	#include <VBox/types.h>
33	#ifdef VBOX_WITH_STATISTICS
34	# include <VBox/vmm/stam.h>
35	#endif
36
37	/** @defgroup grp_pdm_ifs_audio PDM Audio Interfaces
38	* @ingroup grp_pdm_interfaces
39	* @{
40	*/
41
42	/** PDM audio driver instance flags. */
43	typedef uint32_t PDMAUDIODRVFLAGS;
44
45	/** No flags set. */
46	#define PDMAUDIODRVFLAGS_NONE 0
47	/** Marks a primary audio driver which is critical
48	* when running the VM. */
49	#define PDMAUDIODRVFLAGS_PRIMARY RT_BIT(0)
50
51	/**
52	* Audio format in signed or unsigned variants.
53	*/
54	typedef enum PDMAUDIOFMT
55	{
56	/** Invalid format, do not use. */
57	PDMAUDIOFMT_INVALID,
58	/** 8-bit, unsigned. */
59	PDMAUDIOFMT_U8,
60	/** 8-bit, signed. */
61	PDMAUDIOFMT_S8,
62	/** 16-bit, unsigned. */
63	PDMAUDIOFMT_U16,
64	/** 16-bit, signed. */
65	PDMAUDIOFMT_S16,
66	/** 32-bit, unsigned. */
67	PDMAUDIOFMT_U32,
68	/** 32-bit, signed. */
69	PDMAUDIOFMT_S32,
70	/** Hack to blow the type up to 32-bit. */
71	PDMAUDIOFMT_32BIT_HACK = 0x7fffffff
72	} PDMAUDIOFMT;
73
74	/**
75	* Audio direction.
76	*/
77	typedef enum PDMAUDIODIR
78	{
79	/** Unknown direction. */
80	PDMAUDIODIR_UNKNOWN = 0,
81	/** Input. */
82	PDMAUDIODIR_IN = 1,
83	/** Output. */
84	PDMAUDIODIR_OUT = 2,
85	/** Duplex handling. */
86	PDMAUDIODIR_ANY = 3,
87	/** Hack to blow the type up to 32-bit. */
88	PDMAUDIODIR_32BIT_HACK = 0x7fffffff
89	} PDMAUDIODIR;
90
91	/** Device latency spec in milliseconds (ms). */
92	typedef uint32_t PDMAUDIODEVLATSPECMS;
93
94	/** Device latency spec in seconds (s). */
95	typedef uint32_t PDMAUDIODEVLATSPECSEC;
96
97	/** Audio device flags. Use with PDMAUDIODEV_FLAG_ flags. */
98	typedef uint32_t PDMAUDIODEVFLAG;
99
100	/** No flags set. */
101	#define PDMAUDIODEV_FLAGS_NONE 0
102	/** The device marks the default device within the host OS. */
103	#define PDMAUDIODEV_FLAGS_DEFAULT RT_BIT(0)
104	/** The device can be removed at any time and we have to deal with it. */
105	#define PDMAUDIODEV_FLAGS_HOTPLUG RT_BIT(1)
106	/** The device is known to be buggy and needs special treatment. */
107	#define PDMAUDIODEV_FLAGS_BUGGY RT_BIT(2)
108	/** Ignore the device, no matter what. */
109	#define PDMAUDIODEV_FLAGS_IGNORE RT_BIT(3)
110	/** The device is present but marked as locked by some other application. */
111	#define PDMAUDIODEV_FLAGS_LOCKED RT_BIT(4)
112	/** The device is present but not in an alive state (dead). */
113	#define PDMAUDIODEV_FLAGS_DEAD RT_BIT(5)
114
115	/**
116	* Audio device type.
117	*/
118	typedef enum PDMAUDIODEVICETYPE
119	{
120	/** Unknown device type. This is the default. */
121	PDMAUDIODEVICETYPE_UNKNOWN = 0,
122	/** Dummy device; for backends which are not able to report
123	* actual device information (yet). */
124	PDMAUDIODEVICETYPE_DUMMY,
125	/** The device is built into the host (non-removable). */
126	PDMAUDIODEVICETYPE_BUILTIN,
127	/** The device is an (external) USB device. */
128	PDMAUDIODEVICETYPE_USB,
129	/** Hack to blow the type up to 32-bit. */
130	PDMAUDIODEVICETYPE_32BIT_HACK = 0x7fffffff
131	} PDMAUDIODEVICETYPE;
132
133	/**
134	* Audio device instance data.
135	*/
136	typedef struct PDMAUDIODEVICE
137	{
138	/** List node. */
139	RTLISTNODE Node;
140	/** Friendly name of the device, if any. */
141	char szName[64];
142	/** The device type. */
143	PDMAUDIODEVICETYPE enmType;
144	/** Reference count indicating how many audio streams currently are relying on this device. */
145	uint8_t cRefCount;
146	/** Usage of the device. */
147	PDMAUDIODIR enmUsage;
148	/** Device flags. */
149	PDMAUDIODEVFLAG fFlags;
150	/** Maximum number of input audio channels the device supports. */
151	uint8_t cMaxInputChannels;
152	/** Maximum number of output audio channels the device supports. */
153	uint8_t cMaxOutputChannels;
154	/** Additional data which might be relevant for the current context. */
155	void *pvData;
156	/** Size of the additional data. */
157	size_t cbData;
158	/** Device type union, based on enmType. */
159	union
160	{
161	/** USB type specifics. */
162	struct
163	{
164	/** Vendor ID. */
165	int16_t VID;
166	/** Product ID. */
167	int16_t PID;
168	} USB;
169	} Type;
170	} PDMAUDIODEVICE, *PPDMAUDIODEVICE;
171
172	/**
173	* Structure for keeping an audio device enumeration.
174	*/
175	typedef struct PDMAUDIODEVICEENUM
176	{
177	/** Number of audio devices in the list. */
178	uint16_t cDevices;
179	/** List of audio devices. */
180	RTLISTANCHOR lstDevices;
181	} PDMAUDIODEVICEENUM, *PPDMAUDIODEVICEENUM;
182
183	/**
184	* Audio (static) configuration of an audio host backend.
185	*/
186	typedef struct PDMAUDIOBACKENDCFG
187	{
188	/** Size (in bytes) of the host backend's audio output stream structure. */
189	size_t cbStreamOut;
190	/** Size (in bytes) of the host backend's audio input stream structure. */
191	size_t cbStreamIn;
192	/** Number of concurrent output streams supported on the host.
193	* UINT32_MAX for unlimited concurrent streams, 0 if no concurrent input streams are supported. */
194	uint32_t cMaxStreamsOut;
195	/** Number of concurrent input streams supported on the host.
196	* UINT32_MAX for unlimited concurrent streams, 0 if no concurrent input streams are supported. */
197	uint32_t cMaxStreamsIn;
198	} PDMAUDIOBACKENDCFG, *PPDMAUDIOBACKENDCFG;
199
200	/**
201	* A single audio sample, representing left and right channels (stereo).
202	*/
203	typedef struct PDMAUDIOSAMPLE
204	{
205	/** Left channel. */
206	int64_t i64LSample;
207	/** Right channel. */
208	int64_t i64RSample;
209	} PDMAUDIOSAMPLE;
210	/** Pointer to a single (stereo) audio sample. */
211	typedef PDMAUDIOSAMPLE *PPDMAUDIOSAMPLE;
212	/** Pointer to a const single (stereo) audio sample. */
213	typedef PDMAUDIOSAMPLE const *PCPDMAUDIOSAMPLE;
214
215	typedef enum PDMAUDIOENDIANNESS
216	{
217	/** The usual invalid endian. */
218	PDMAUDIOENDIANNESS_INVALID,
219	/** Little endian. */
220	PDMAUDIOENDIANNESS_LITTLE,
221	/** Bit endian. */
222	PDMAUDIOENDIANNESS_BIG,
223	/** Endianness doesn't have a meaning in the context. */
224	PDMAUDIOENDIANNESS_NA,
225	/** The end of the valid endian values (exclusive). */
226	PDMAUDIOENDIANNESS_END,
227	/** Hack to blow the type up to 32-bit. */
228	PDMAUDIOENDIANNESS_32BIT_HACK = 0x7fffffff
229	} PDMAUDIOENDIANNESS;
230
231	/**
232	* Audio playback destinations.
233	*/
234	typedef enum PDMAUDIOPLAYBACKDEST
235	{
236	/** Unknown destination. */
237	PDMAUDIOPLAYBACKDEST_UNKNOWN = 0,
238	/** Front channel. */
239	PDMAUDIOPLAYBACKDEST_FRONT,
240	/** Center / LFE (Subwoofer) channel. */
241	PDMAUDIOPLAYBACKDEST_CENTER_LFE,
242	/** Rear channel. */
243	PDMAUDIOPLAYBACKDEST_REAR,
244	/** Hack to blow the type up to 32-bit. */
245	PDMAUDIOPLAYBACKDEST_32BIT_HACK = 0x7fffffff
246	} PDMAUDIOPLAYBACKDEST;
247
248	/**
249	* Audio recording sources.
250	*/
251	typedef enum PDMAUDIORECSOURCE
252	{
253	/** Unknown recording source. */
254	PDMAUDIORECSOURCE_UNKNOWN = 0,
255	/** Microphone-In. */
256	PDMAUDIORECSOURCE_MIC,
257	/** CD. */
258	PDMAUDIORECSOURCE_CD,
259	/** Video-In. */
260	PDMAUDIORECSOURCE_VIDEO,
261	/** AUX. */
262	PDMAUDIORECSOURCE_AUX,
263	/** Line-In. */
264	PDMAUDIORECSOURCE_LINE,
265	/** Phone-In. */
266	PDMAUDIORECSOURCE_PHONE,
267	/** Hack to blow the type up to 32-bit. */
268	PDMAUDIORECSOURCE_32BIT_HACK = 0x7fffffff
269	} PDMAUDIORECSOURCE;
270
271	/**
272	* Audio stream (data) layout.
273	*/
274	typedef enum PDMAUDIOSTREAMLAYOUT
275	{
276	/** Unknown access type; do not use. */
277	PDMAUDIOSTREAMLAYOUT_UNKNOWN = 0,
278	/** Non-interleaved access, that is, consecutive
279	* access to the data. */
280	PDMAUDIOSTREAMLAYOUT_NON_INTERLEAVED,
281	/** Interleaved access, where the data can be
282	* mixed together with data of other audio streams. */
283	PDMAUDIOSTREAMLAYOUT_INTERLEAVED,
284	/** Complex layout, which does not fit into the
285	* interleaved / non-interleaved layouts. */
286	PDMAUDIOSTREAMLAYOUT_COMPLEX,
287	/** Raw (pass through) data, with no data layout processing done. */
288	PDMAUDIOSTREAMLAYOUT_RAW,
289	/** Hack to blow the type up to 32-bit. */
290	PDMAUDIOSTREAMLAYOUT_32BIT_HACK = 0x7fffffff
291	} PDMAUDIOSTREAMLAYOUT, *PPDMAUDIOSTREAMLAYOUT;
292
293	/** No stream channel data flags defined. */
294	#define PDMAUDIOSTREAMCHANNELDATA_FLAG_NONE 0
295
296	/**
297	* Structure for keeping a stream channel data block around.
298	*/
299	typedef struct PDMAUDIOSTREAMCHANNELDATA
300	{
301	/** Circular buffer for the channel data. */
302	PRTCIRCBUF pCircBuf;
303	size_t cbAcq;
304	/** Channel data flags. */
305	uint32_t fFlags;
306	} PDMAUDIOSTREAMCHANNELDATA, *PPDMAUDIOSTREAMCHANNELDATA;
307
308	/**
309	* Structure for a single channel of an audio stream.
310	* An audio stream consists of one or multiple channels,
311	* depending on the configuration.
312	*/
313	typedef struct PDMAUDIOSTREAMCHANNEL
314	{
315	/** Channel ID. */
316	uint8_t uChannel;
317	/** Step size (in bytes) to the channel's next frame. */
318	size_t cbStep;
319	/** Frame size (in bytes) of this channel. */
320	size_t cbFrame;
321	/** Offset (in bytes) to first sample in the data block. */
322	size_t cbFirst;
323	/** Currente offset (in bytes) in the data stream. */
324	size_t cbOff;
325	/** Associated data buffer. */
326	PDMAUDIOSTREAMCHANNELDATA Data;
327	} PDMAUDIOSTREAMCHANNEL, *PPDMAUDIOSTREAMCHANNEL;
328
329	/**
330	* Union for keeping an audio stream destination or source.
331	*/
332	typedef union PDMAUDIODESTSOURCE
333	{
334	/** Desired playback destination (for an output stream). */
335	PDMAUDIOPLAYBACKDEST Dest;
336	/** Desired recording source (for an input stream). */
337	PDMAUDIORECSOURCE Source;
338	} PDMAUDIODESTSOURCE, *PPDMAUDIODESTSOURCE;
339
340	/**
341	* Properties of audio streams for host/guest
342	* for in or out directions.
343	*/
344	typedef struct PDMAUDIOPCMPROPS
345	{
346	/** Sample width. Bits per sample. */
347	uint8_t cBits;
348	/** Signed or unsigned sample. */
349	bool fSigned;
350	/** Shift count used for faster calculation of various
351	* values, such as the alignment, bytes to samples and so on.
352	* Depends on number of stream channels and the stream format
353	* being used.
354	*
355	** @todo Use some RTAsmXXX functions instead?
356	*/
357	uint8_t cShift;
358	/** Number of audio channels. */
359	uint8_t cChannels;
360	/** Sample frequency in Hertz (Hz). */
361	uint32_t uHz;
362	/** Whether the endianness is swapped or not. */
363	bool fSwapEndian;
364	} PDMAUDIOPCMPROPS, *PPDMAUDIOPCMPROPS;
365
366	/** Calculates the cShift value of given samples bits and audio channels.
367	* Note: Does only support mono/stereo channels for now. */
368	#define PDMAUDIOPCMPROPS_MAKE_SHIFT_PARMS(cBits, cChannels) ((cChannels == 2) + (cBits / 16))
369	/** Calculates the cShift value of a PDMAUDIOPCMPROPS structure.
370	* Note: Does only support mono/stereo channels for now. */
371	#define PDMAUDIOPCMPROPS_MAKE_SHIFT(pProps) PDMAUDIOPCMPROPS_MAKE_SHIFT_PARMS((pProps)->cChannels == 2) + (pProps)->cBits / 16)
372	/** Converts (audio) samples to bytes.
373	* Needs the cShift value set correctly, using PDMAUDIOPCMPROPS_MAKE_SHIFT. */
374	#define PDMAUDIOPCMPROPS_S2B(pProps, samples) ((samples) << (pProps)->cShift)
375	/** Converts bytes to (audio) samples.
376	* Needs the cShift value set correctly, using PDMAUDIOPCMPROPS_MAKE_SHIFT. */
377	#define PDMAUDIOPCMPROPS_B2S(pProps, cb) (cb >> (pProps)->cShift)
378
379	/**
380	* Structure for keeping an audio stream configuration.
381	*/
382	typedef struct PDMAUDIOSTREAMCFG
383	{
384	/** Friendly name of the stream. */
385	char szName[64];
386	/** Direction of the stream. */
387	PDMAUDIODIR enmDir;
388	/** Destination / source indicator, depending on enmDir. */
389	PDMAUDIODESTSOURCE DestSource;
390	/** The stream's PCM properties. */
391	PDMAUDIOPCMPROPS Props;
392	/** The stream's audio data layout.
393	* This indicates how the audio data buffers to/from the backend is being layouted.
394	*
395	* Currently, the following layouts are supported by the audio connector:
396	*
397	* PDMAUDIOSTREAMLAYOUT_NON_INTERLEAVED:
398	* One stream at once. The consecutive audio data is exactly in the format and sample width
399	* like defined in the PCM properties. This is the default.
400	*
401	* PDMAUDIOSTREAMLAYOUT_RAW:
402	* Can be one or many streams at once, depending on the stream's mixing buffer setup.
403	* The audio data will get handled as PDMAUDIOSAMPLE samples without any modification done. */
404	PDMAUDIOSTREAMLAYOUT enmLayout;
405	/** Hint about the optimal sample buffer size (in audio samples).
406	* 0 if no hint is given. */
407	uint32_t cSampleBufferHint;
408	} PDMAUDIOSTREAMCFG, *PPDMAUDIOSTREAMCFG;
409
410	/** Converts (audio) samples to bytes. */
411	#define PDMAUDIOSTREAMCFG_S2B(pCfg, samples) ((samples) << (pCfg->Props).cShift)
412	/** Converts bytes to (audio) samples. */
413	#define PDMAUDIOSTREAMCFG_B2S(pCfg, cb) (cb >> (pCfg->Props).cShift)
414
415	#if defined(RT_LITTLE_ENDIAN)
416	# define PDMAUDIOHOSTENDIANNESS PDMAUDIOENDIANNESS_LITTLE
417	#elif defined(RT_BIG_ENDIAN)
418	# define PDMAUDIOHOSTENDIANNESS PDMAUDIOENDIANNESS_BIG
419	#else
420	# error "Port me!"
421	#endif
422
423	/**
424	* Audio mixer controls.
425	*/
426	typedef enum PDMAUDIOMIXERCTL
427	{
428	/** Unknown mixer control. */
429	PDMAUDIOMIXERCTL_UNKNOWN = 0,
430	/** Master volume. */
431	PDMAUDIOMIXERCTL_VOLUME_MASTER,
432	/** Front. */
433	PDMAUDIOMIXERCTL_FRONT,
434	/** Center / LFE (Subwoofer). */
435	PDMAUDIOMIXERCTL_CENTER_LFE,
436	/** Rear. */
437	PDMAUDIOMIXERCTL_REAR,
438	/** Line-In. */
439	PDMAUDIOMIXERCTL_LINE_IN,
440	/** Microphone-In. */
441	PDMAUDIOMIXERCTL_MIC_IN,
442	/** Hack to blow the type up to 32-bit. */
443	PDMAUDIOMIXERCTL_32BIT_HACK = 0x7fffffff
444	} PDMAUDIOMIXERCTL;
445
446	/**
447	* Audio stream commands. Used in the audio connector
448	* as well as in the actual host backends.
449	*/
450	typedef enum PDMAUDIOSTREAMCMD
451	{
452	/** Unknown command, do not use. */
453	PDMAUDIOSTREAMCMD_UNKNOWN = 0,
454	/** Enables the stream. */
455	PDMAUDIOSTREAMCMD_ENABLE,
456	/** Disables the stream. */
457	PDMAUDIOSTREAMCMD_DISABLE,
458	/** Pauses the stream. */
459	PDMAUDIOSTREAMCMD_PAUSE,
460	/** Resumes the stream. */
461	PDMAUDIOSTREAMCMD_RESUME,
462	/** Hack to blow the type up to 32-bit. */
463	PDMAUDIOSTREAMCMD_32BIT_HACK = 0x7fffffff
464	} PDMAUDIOSTREAMCMD;
465
466	/**
467	* Audio volume parameters.
468	*/
469	typedef struct PDMAUDIOVOLUME
470	{
471	/** Set to @c true if this stream is muted, @c false if not. */
472	bool fMuted;
473	/** Left channel volume.
474	* Range is from [0 ... 255], whereas 0 specifies
475	* the most silent and 255 the loudest value. */
476	uint8_t uLeft;
477	/** Right channel volume.
478	* Range is from [0 ... 255], whereas 0 specifies
479	* the most silent and 255 the loudest value. */
480	uint8_t uRight;
481	} PDMAUDIOVOLUME, *PPDMAUDIOVOLUME;
482
483	/** Defines the minimum volume allowed. */
484	#define PDMAUDIO_VOLUME_MIN (0)
485	/** Defines the maximum volume allowed. */
486	#define PDMAUDIO_VOLUME_MAX (255)
487
488	/**
489	* Structure for holding rate processing information
490	* of a source + destination audio stream. This is needed
491	* because both streams can differ regarding their rates
492	* and therefore need to be treated accordingly.
493	*/
494	typedef struct PDMAUDIOSTRMRATE
495	{
496	/** Current (absolute) offset in the output
497	* (destination) stream. */
498	uint64_t dstOffset;
499	/** Increment for moving dstOffset for the
500	* destination stream. This is needed because the
501	* source <-> destination rate might be different. */
502	uint64_t dstInc;
503	/** Current (absolute) offset in the input
504	* stream. */
505	uint32_t srcOffset;
506	/** Last processed sample of the input stream.
507	* Needed for interpolation. */
508	PDMAUDIOSAMPLE srcSampleLast;
509	} PDMAUDIOSTRMRATE, *PPDMAUDIOSTRMRATE;
510
511	/**
512	* Structure for holding mixing buffer volume parameters.
513	* The volume values are in fixed point style and must
514	* be converted to/from before using with e.g. PDMAUDIOVOLUME.
515	*/
516	typedef struct PDMAUDMIXBUFVOL
517	{
518	/** Set to @c true if this stream is muted, @c false if not. */
519	bool fMuted;
520	/** Left volume to apply during conversion. Pass 0
521	* to convert the original values. May not apply to
522	* all conversion functions. */
523	uint32_t uLeft;
524	/** Right volume to apply during conversion. Pass 0
525	* to convert the original values. May not apply to
526	* all conversion functions. */
527	uint32_t uRight;
528	} PDMAUDMIXBUFVOL, *PPDMAUDMIXBUFVOL;
529
530	/**
531	* Structure for holding sample conversion parameters for
532	* the audioMixBufConvFromXXX / audioMixBufConvToXXX macros.
533	*/
534	typedef struct PDMAUDMIXBUFCONVOPTS
535	{
536	/** Number of audio samples to convert. */
537	uint32_t cSamples;
538	union
539	{
540	struct
541	{
542	/** Volume to use for conversion. */
543	PDMAUDMIXBUFVOL Volume;
544	} From;
545	};
546	} PDMAUDMIXBUFCONVOPTS;
547	/** Pointer to conversion parameters for the audio mixer. */
548	typedef PDMAUDMIXBUFCONVOPTS *PPDMAUDMIXBUFCONVOPTS;
549	/** Pointer to const conversion parameters for the audio mixer. */
550	typedef PDMAUDMIXBUFCONVOPTS const *PCPDMAUDMIXBUFCONVOPTS;
551
552	/**
553	* Note: All internal handling is done in samples,
554	* not in bytes!
555	*/
556	typedef uint32_t PDMAUDIOMIXBUFFMT;
557	typedef PDMAUDIOMIXBUFFMT *PPDMAUDIOMIXBUFFMT;
558
559	/**
560	* Convertion-from function used by the PDM audio buffer mixer.
561	*
562	* @returns Number of samples returned.
563	* @param paDst Where to return the converted samples.
564	* @param pvSrc The source samples bytes.
565	* @param cbSrc Number of bytes to convert.
566	* @param pOpts Conversion options.
567	*/
568	typedef DECLCALLBACK(uint32_t) FNPDMAUDIOMIXBUFCONVFROM(PPDMAUDIOSAMPLE paDst, const void *pvSrc, uint32_t cbSrc,
569	PCPDMAUDMIXBUFCONVOPTS pOpts);
570	/** Pointer to a convertion-from function used by the PDM audio buffer mixer. */
571	typedef FNPDMAUDIOMIXBUFCONVFROM *PFNPDMAUDIOMIXBUFCONVFROM;
572
573	/**
574	* Convertion-to function used by the PDM audio buffer mixer.
575	*
576	* @param pvDst Output buffer.
577	* @param paSrc The input samples.
578	* @param pOpts Conversion options.
579	*/
580	typedef DECLCALLBACK(void) FNPDMAUDIOMIXBUFCONVTO(void *pvDst, PCPDMAUDIOSAMPLE paSrc, PCPDMAUDMIXBUFCONVOPTS pOpts);
581	/** Pointer to a convertion-to function used by the PDM audio buffer mixer. */
582	typedef FNPDMAUDIOMIXBUFCONVTO *PFNPDMAUDIOMIXBUFCONVTO;
583
584	typedef struct PDMAUDIOMIXBUF *PPDMAUDIOMIXBUF;
585	typedef struct PDMAUDIOMIXBUF
586	{
587	RTLISTNODE Node;
588	/** Name of the buffer. */
589	char *pszName;
590	/** Sample buffer. */
591	PPDMAUDIOSAMPLE pSamples;
592	/** Size of the sample buffer (in samples). */
593	uint32_t cSamples;
594	/** The current read position (in samples). */
595	uint32_t offRead;
596	/** The current write position (in samples). */
597	uint32_t offWrite;
598	/**
599	* Total samples already mixed down to the parent buffer (if any). Always starting at
600	* the parent's offRead position.
601	*
602	* Note: Count always is specified in parent samples, as the sample count can differ between parent
603	* and child.
604	*/
605	uint32_t cMixed;
606	/** How much audio samples are currently being used
607	* in this buffer.
608	* Note: This also is known as the distance in ring buffer terms. */
609	uint32_t cUsed;
610	/** Pointer to parent buffer (if any). */
611	PPDMAUDIOMIXBUF pParent;
612	/** List of children mix buffers to keep in sync with (if being a parent buffer). */
613	RTLISTANCHOR lstChildren;
614	/** Intermediate structure for buffer conversion tasks. */
615	PPDMAUDIOSTRMRATE pRate;
616	/** Internal representation of current volume used for mixing. */
617	PDMAUDMIXBUFVOL Volume;
618	/** This buffer's audio format. */
619	PDMAUDIOMIXBUFFMT AudioFmt;
620	/** Standard conversion-to function for set AudioFmt. */
621	PFNPDMAUDIOMIXBUFCONVTO pfnConvTo;
622	/** Standard conversion-from function for set AudioFmt. */
623	PFNPDMAUDIOMIXBUFCONVFROM pfnConvFrom;
624	/**
625	* Ratio of the associated parent stream's frequency by this stream's
626	* frequency (1<<32), represented as a signed 64 bit integer.
627	*
628	* For example, if the parent stream has a frequency of 44 khZ, and this
629	* stream has a frequency of 11 kHz, the ration then would be
630	* (44/11 * (1 << 32)).
631	*
632	* Currently this does not get changed once assigned.
633	*/
634	int64_t iFreqRatio;
635	/** For quickly converting samples <-> bytes and vice versa. */
636	uint8_t cShift;
637	} PDMAUDIOMIXBUF;
638
639	typedef uint32_t PDMAUDIOFILEFLAGS;
640
641	/* No flags defined. */
642	#define PDMAUDIOFILEFLAG_NONE 0
643
644	/**
645	* Audio file types.
646	*/
647	typedef enum PDMAUDIOFILETYPE
648	{
649	/** Unknown type, do not use. */
650	PDMAUDIOFILETYPE_UNKNOWN = 0,
651	/** Wave (.WAV) file. */
652	PDMAUDIOFILETYPE_WAV,
653	/** Hack to blow the type up to 32-bit. */
654	PDMAUDIOFILETYPE_32BIT_HACK = 0x7fffffff
655	} PDMAUDIOFILETYPE;
656
657	/**
658	* Structure for an audio file handle.
659	*/
660	typedef struct PDMAUDIOFILE
661	{
662	/** Type of the audio file. */
663	PDMAUDIOFILETYPE enmType;
664	/** File name. */
665	char szName[255];
666	/** Actual file handle. */
667	RTFILE hFile;
668	/** Data needed for the specific audio file type implemented.
669	* Optional, can be NULL. */
670	void *pvData;
671	/** Data size (in bytes). */
672	size_t cbData;
673	} PDMAUDIOFILE, *PPDMAUDIOFILE;
674
675	/** Stream status flag. To be used with PDMAUDIOSTRMSTS_FLAG_ flags. */
676	typedef uint32_t PDMAUDIOSTRMSTS;
677
678	/** No flags being set. */
679	#define PDMAUDIOSTRMSTS_FLAG_NONE 0
680	/** Whether this stream has been initialized by the
681	* backend or not. */
682	#define PDMAUDIOSTRMSTS_FLAG_INITIALIZED RT_BIT_32(0)
683	/** Whether this stream is enabled or disabled. */
684	#define PDMAUDIOSTRMSTS_FLAG_ENABLED RT_BIT_32(1)
685	/** Whether this stream has been paused or not. This also implies
686	* that this is an enabled stream! */
687	#define PDMAUDIOSTRMSTS_FLAG_PAUSED RT_BIT_32(2)
688	/** Whether this stream was marked as being disabled
689	* but there are still associated guest output streams
690	* which rely on its data. */
691	#define PDMAUDIOSTRMSTS_FLAG_PENDING_DISABLE RT_BIT_32(3)
692	/** Whether this stream is in re-initialization phase.
693	* All other bits remain untouched to be able to restore
694	* the stream's state after the re-initialization bas been
695	* finished. */
696	#define PDMAUDIOSTRMSTS_FLAG_PENDING_REINIT RT_BIT_32(4)
697	/** Validation mask. */
698	#define PDMAUDIOSTRMSTS_VALID_MASK UINT32_C(0x0000001F)
699
700	/**
701	* Enumeration presenting a backend's current status.
702	*/
703	typedef enum PDMAUDIOBACKENDSTS
704	{
705	/** Unknown/invalid status. */
706	PDMAUDIOBACKENDSTS_UNKNOWN = 0,
707	/** The backend is in its initialization phase.
708	* Not all backends support this status. */
709	PDMAUDIOBACKENDSTS_INITIALIZING,
710	/** The backend has stopped its operation. */
711	PDMAUDIOBACKENDSTS_STOPPED,
712	/** The backend is up and running. */
713	PDMAUDIOBACKENDSTS_RUNNING,
714	/** The backend ran into an error and is unable to recover.
715	* A manual re-initialization might help. */
716	PDMAUDIOBACKENDSTS_ERROR,
717	/** Hack to blow the type up to 32-bit. */
718	PDMAUDIOBACKENDSTS_32BIT_HACK = 0x7fffffff
719	} PDMAUDIOBACKENDSTS;
720
721	/**
722	* Audio stream context.
723	*/
724	typedef enum PDMAUDIOSTREAMCTX
725	{
726	/** No context set / invalid. */
727	PDMAUDIOSTREAMCTX_UNKNOWN = 0,
728	/** Host stream, connected to a backend. */
729	PDMAUDIOSTREAMCTX_HOST,
730	/** Guest stream, connected to the device emulation. */
731	PDMAUDIOSTREAMCTX_GUEST,
732	/** Hack to blow the type up to 32-bit. */
733	PDMAUDIOSTREAMCTX_32BIT_HACK = 0x7fffffff
734	} PDMAUDIOSTREAMCTX;
735
736	/**
737	* Structure for keeping audio input stream specifics.
738	* Do not use directly. Instead, use PDMAUDIOSTREAM.
739	*/
740	typedef struct PDMAUDIOSTREAMIN
741	{
742	/** Timestamp (in ms) since last read. */
743	uint64_t tsLastReadMS;
744	#ifdef VBOX_WITH_STATISTICS
745	STAMCOUNTER StatBytesElapsed;
746	STAMCOUNTER StatBytesTotalRead;
747	STAMCOUNTER StatSamplesCaptured;
748	#endif
749	} PDMAUDIOSTREAMIN, *PPDMAUDIOSTREAMIN;
750
751	/**
752	* Structure for keeping audio output stream specifics.
753	* Do not use directly. Instead, use PDMAUDIOSTREAM.
754	*/
755	typedef struct PDMAUDIOSTREAMOUT
756	{
757	/** Timestamp (in ms) since last write. */
758	uint64_t tsLastWriteMS;
759	#ifdef VBOX_WITH_STATISTICS
760	STAMCOUNTER StatBytesElapsed;
761	STAMCOUNTER StatBytesTotalWritten;
762	STAMCOUNTER StatSamplesPlayed;
763	#endif
764	} PDMAUDIOSTREAMOUT, *PPDMAUDIOSTREAMOUT;
765
766	struct PDMAUDIOSTREAM;
767	typedef PDMAUDIOSTREAM *PPDMAUDIOSTREAM;
768
769	/**
770	* Structure for maintaining an nput/output audio stream.
771	*/
772	typedef struct PDMAUDIOSTREAM
773	{
774	/** List node. */
775	RTLISTNODE Node;
776	/** Pointer to the other pair of this stream.
777	* This might be the host or guest side. */
778	PPDMAUDIOSTREAM pPair;
779	/** Name of this stream. */
780	char szName[64];
781	/** Number of references to this stream. Only can be
782	* destroyed if the reference count is reaching 0. */
783	uint32_t cRefs;
784	/** The stream's audio configuration. */
785	PDMAUDIOSTREAMCFG Cfg;
786	/** Stream status flag. */
787	PDMAUDIOSTRMSTS fStatus;
788	/** This stream's mixing buffer. */
789	PDMAUDIOMIXBUF MixBuf;
790	/** Audio direction of this stream. */
791	PDMAUDIODIR enmDir;
792	/** Context of this stream. */
793	PDMAUDIOSTREAMCTX enmCtx;
794	/** Timestamp (in ms) since last iteration. */
795	uint64_t tsLastIterateMS;
796	/** Union for input/output specifics. */
797	union
798	{
799	PDMAUDIOSTREAMIN In;
800	PDMAUDIOSTREAMOUT Out;
801	};
802	/** Data to backend-specific stream data.
803	* This data block will be casted by the backend to access its backend-dependent data.
804	*
805	* That way the backends do not have access to the audio connector's data. */
806	void *pvBackend;
807	/** Size (in bytes) of the backend-specific stream data. */
808	size_t cbBackend;
809	} PDMAUDIOSTREAM, *PPDMAUDIOSTREAM;
810
811	/** Pointer to a audio connector interface. */
812	typedef struct PDMIAUDIOCONNECTOR *PPDMIAUDIOCONNECTOR;
813
814	/**
815	* Audio callback types.
816	* Those callbacks are being sent from the backends to the audio connector.
817	*/
818	typedef enum PDMAUDIOCBTYPE
819	{
820	/** Invalid, do not use. */
821	PDMAUDIOCBTYPE_INVALID = 0,
822	/** The backend's status has changed. */
823	PDMAUDIOCBTYPE_STATUS,
824	/** One or more host audio devices have changed. */
825	PDMAUDIOCBTYPE_DEVICES_CHANGED,
826	/** Data is availabe as input for passing to the device emulation. */
827	PDMAUDIOCBTYPE_DATA_INPUT,
828	/** Free data for the device emulation to write to the backend. */
829	PDMAUDIOCBTYPE_DATA_OUTPUT
830	} PDMAUDIOCBTYPE;
831
832	/**
833	* Callback data for audio input.
834	*/
835	typedef struct PDMAUDIOCBDATA_DATA_INPUT
836	{
837	/** Input: How many bytes are availabe as input for passing
838	* to the device emulation. */
839	uint32_t cbInAvail;
840	/** Output: How many bytes have been read. */
841	uint32_t cbOutRead;
842	} PDMAUDIOCBDATA_DATA_INPUT, *PPDMAUDIOCBDATA_DATA_INPUT;
843
844	/**
845	* Callback data for audio output.
846	*/
847	typedef struct PDMAUDIOCBDATA_DATA_OUTPUT
848	{
849	/** Input: How many bytes are free for the device emulation to write. */
850	uint32_t cbInFree;
851	/** Output: How many bytes were written by the device emulation. */
852	uint32_t cbOutWritten;
853	} PDMAUDIOCBDATA_DATA_OUTPUT, *PPDMAUDIOCBDATA_DATA_OUTPUT;
854
855	/** Pointer to a host audio interface. */
856	typedef struct PDMIHOSTAUDIO *PPDMIHOSTAUDIO;
857
858	/**
859	* Host audio (backend) callback function.
860	*
861	* @returns IPRT status code.
862	* @param pDrvIns Pointer to driver instance which called us.
863	* @param enmType Callback type.
864	* @param pvUser User argument.
865	* @param cbUser Size (in bytes) of user argument.
866	*/
867	typedef DECLCALLBACK(int) FNPDMHOSTAUDIOCALLBACK(PPDMDRVINS pDrvIns, PDMAUDIOCBTYPE enmType, void *pvUser, size_t cbUser);
868	/** Pointer to a FNPDMHOSTAUDIOCALLBACK(). */
869	typedef FNPDMHOSTAUDIOCALLBACK *PFNPDMHOSTAUDIOCALLBACK;
870
871	#ifdef VBOX_WITH_AUDIO_DEVICE_CALLBACKS
872	/**
873	* Structure for keeping a registered audio callback around.
874	*/
875	typedef struct PDMAUDIOCALLBACK
876	{
877	/** List node. */
878	RTLISTANCHOR Node;
879	/** Callback type. */
880	PDMAUDIOCBTYPE enmType;
881	/** Pointer to context data. Optional. */
882	void *pvCtx;
883	/** Size (in bytes) of context data.
884	* Must be 0 if pvCtx is NULL. */
885	size_t cbCtx;
886	/** Actual callback function to call. */
887	PFNPDMAUDIOCALLBACK pFn;
888	} PDMAUDIOCALLBACK, *PPDMAUDIOCALLBACK;
889	#endif /* VBOX_WITH_AUDIO_DEVICE_CALLBACKS */
890
891	#define PPDMAUDIOBACKENDSTREAM void *
892
893	/**
894	* Audio connector interface (up).
895	*/
896	typedef struct PDMIAUDIOCONNECTOR
897	{
898	/**
899	* Retrieves the current configuration of the host audio backend.
900	*
901	* @returns VBox status code.
902	* @param pInterface Pointer to the interface structure containing the called function pointer.
903	* @param pCfg Where to store the host audio backend configuration data.
904	*/
905	DECLR3CALLBACKMEMBER(int, pfnGetConfig, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOBACKENDCFG pCfg));
906
907	/**
908	* Retrieves the current status of the host audio backend.
909	*
910	* @returns Status of the host audio backend.
911	* @param pInterface Pointer to the interface structure containing the called function pointer.
912	* @param enmDir Audio direction to check host audio backend for. Specify PDMAUDIODIR_ANY for the overall
913	* backend status.
914	*/
915	DECLR3CALLBACKMEMBER(PDMAUDIOBACKENDSTS, pfnGetStatus, (PPDMIAUDIOCONNECTOR pInterface, PDMAUDIODIR enmDir));
916
917	/**
918	* Creates an audio stream.
919	*
920	* @returns VBox status code.
921	* @param pInterface Pointer to the interface structure containing the called function pointer.
922	* @param pCfgHost Stream configuration for host side.
923	* @param pCfgGuest Stream configuration for guest side.
924	* @param ppStream Pointer where to return the created audio stream on success.
925	*/
926	DECLR3CALLBACKMEMBER(int, pfnStreamCreate, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAMCFG pCfgHost, PPDMAUDIOSTREAMCFG pCfgGuest, PPDMAUDIOSTREAM *ppStream));
927
928	/**
929	* Destroys an audio stream.
930	*
931	* @param pInterface Pointer to the interface structure containing the called function pointer.
932	* @param pStream Pointer to audio stream.
933	*/
934	DECLR3CALLBACKMEMBER(int, pfnStreamDestroy, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
935
936	/**
937	* Adds a reference to the specified audio stream.
938	*
939	* @returns New reference count. UINT32_MAX on error.
940	* @param pInterface Pointer to the interface structure containing the called function pointer.
941	* @param pStream Pointer to audio stream adding the reference to.
942	*/
943	DECLR3CALLBACKMEMBER(uint32_t, pfnStreamRetain, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
944
945	/**
946	* Releases a reference from the specified stream.
947	*
948	* @returns New reference count. UINT32_MAX on error.
949	* @param pInterface Pointer to the interface structure containing the called function pointer.
950	* @param pStream Pointer to audio stream releasing a reference from.
951	*/
952	DECLR3CALLBACKMEMBER(uint32_t, pfnStreamRelease, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
953
954	/**
955	* Reads PCM audio data from the host (input).
956	*
957	* @returns VBox status code.
958	* @param pInterface Pointer to the interface structure containing the called function pointer.
959	* @param pStream Pointer to audio stream to write to.
960	* @param pvBuf Where to store the read data.
961	* @param cbBuf Number of bytes to read.
962	* @param pcbRead Bytes of audio data read. Optional.
963	*/
964	DECLR3CALLBACKMEMBER(int, pfnStreamRead, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, void pvBuf, uint32_t cbBuf, uint32_t pcbRead));
965
966	/**
967	* Writes PCM audio data to the host (output).
968	*
969	* @returns VBox status code.
970	* @param pInterface Pointer to the interface structure containing the called function pointer.
971	* @param pStream Pointer to audio stream to read from.
972	* @param pvBuf Audio data to be written.
973	* @param cbBuf Number of bytes to be written.
974	* @param pcbWritten Bytes of audio data written. Optional.
975	*/
976	DECLR3CALLBACKMEMBER(int, pfnStreamWrite, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, const void pvBuf, uint32_t cbBuf, uint32_t pcbWritten));
977
978	/**
979	* Controls a specific audio stream.
980	*
981	* @returns VBox status code.
982	* @param pInterface Pointer to the interface structure containing the called function pointer.
983	* @param pStream Pointer to audio stream.
984	* @param enmStreamCmd The stream command to issue.
985	*/
986	DECLR3CALLBACKMEMBER(int, pfnStreamControl, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, PDMAUDIOSTREAMCMD enmStreamCmd));
987
988	/**
989	* Processes stream data.
990	*
991	* @param pInterface Pointer to the interface structure containing the called function pointer.
992	* @param pStream Pointer to audio stream.
993	*/
994	DECLR3CALLBACKMEMBER(int, pfnStreamIterate, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
995
996	/**
997	* Returns the number of readable data (in bytes) of a specific audio input stream.
998	*
999	* @returns Number of readable data (in bytes).
1000	* @param pInterface Pointer to the interface structure containing the called function pointer.
1001	* @param pStream Pointer to audio stream.
1002	*/
1003	DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetReadable, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
1004
1005	/**
1006	* Returns the number of writable data (in bytes) of a specific audio output stream.
1007	*
1008	* @returns Number of writable data (in bytes).
1009	* @param pInterface Pointer to the interface structure containing the called function pointer.
1010	* @param pStream Pointer to audio stream.
1011	*/
1012	DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetWritable, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
1013
1014	/**
1015	* Returns the status of a specific audio stream.
1016	*
1017	* @returns Audio stream status
1018	* @param pInterface Pointer to the interface structure containing the called function pointer.
1019	* @param pStream Pointer to audio stream.
1020	*/
1021	DECLR3CALLBACKMEMBER(PDMAUDIOSTRMSTS, pfnStreamGetStatus, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream));
1022
1023	/**
1024	* Sets the audio volume of a specific audio stream.
1025	*
1026	* @returns VBox status code.
1027	* @param pInterface Pointer to the interface structure containing the called function pointer.
1028	* @param pStream Pointer to audio stream.
1029	* @param pVol Pointer to audio volume structure to set the stream's audio volume to.
1030	*/
1031	DECLR3CALLBACKMEMBER(int, pfnStreamSetVolume, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, PPDMAUDIOVOLUME pVol));
1032
1033	/**
1034	* Plays (transfers) available audio samples via the host backend. Only works with output streams.
1035	*
1036	* @returns VBox status code.
1037	* @param pInterface Pointer to the interface structure containing the called function pointer.
1038	* @param pStream Pointer to audio stream.
1039	* @param pcSamplesPlayed Number of samples played. Optional.
1040	*/
1041	DECLR3CALLBACKMEMBER(int, pfnStreamPlay, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, uint32_t *pcSamplesPlayed));
1042
1043	/**
1044	* Captures (transfers) available audio samples from the host backend. Only works with input streams.
1045	*
1046	* @returns VBox status code.
1047	* @param pInterface Pointer to the interface structure containing the called function pointer.
1048	* @param pStream Pointer to audio stream.
1049	* @param pcSamplesCaptured Number of samples captured. Optional.
1050	*/
1051	DECLR3CALLBACKMEMBER(int, pfnStreamCapture, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, uint32_t *pcSamplesCaptured));
1052
1053	#ifdef VBOX_WITH_AUDIO_DEVICE_CALLBACKS
1054	DECLR3CALLBACKMEMBER(int, pfnRegisterCallbacks, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOCALLBACK paCallbacks, size_t cCallbacks));
1055	DECLR3CALLBACKMEMBER(int, pfnCallback, (PPDMIAUDIOCONNECTOR pInterface, PDMAUDIOCBTYPE enmType, void *pvUser, size_t cbUser));
1056	#endif
1057
1058	} PDMIAUDIOCONNECTOR;
1059
1060	/** PDMIAUDIOCONNECTOR interface ID. */
1061	#define PDMIAUDIOCONNECTOR_IID "FF2044D1-F8D9-4F42-BE9E-0E9AD14F4552"
1062
1063	/**
1064	* Assigns all needed interface callbacks for an audio backend.
1065	*
1066	* @param a_Prefix The function name prefix.
1067	*/
1068	#define PDMAUDIO_IHOSTAUDIO_CALLBACKS(a_Prefix) \
1069	do { \
1070	pThis->IHostAudio.pfnInit = RT_CONCAT(a_Prefix,Init); \
1071	pThis->IHostAudio.pfnShutdown = RT_CONCAT(a_Prefix,Shutdown); \
1072	pThis->IHostAudio.pfnGetConfig = RT_CONCAT(a_Prefix,GetConfig); \
1073	/** @todo Add pfnGetDevices here as soon as supported by all backends. */ \
1074	pThis->IHostAudio.pfnGetStatus = RT_CONCAT(a_Prefix,GetStatus); \
1075	/** @todo Ditto for pfnSetCallback. */ \
1076	pThis->IHostAudio.pfnStreamCreate = RT_CONCAT(a_Prefix,StreamCreate); \
1077	pThis->IHostAudio.pfnStreamDestroy = RT_CONCAT(a_Prefix,StreamDestroy); \
1078	pThis->IHostAudio.pfnStreamControl = RT_CONCAT(a_Prefix,StreamControl); \
1079	pThis->IHostAudio.pfnStreamGetReadable = RT_CONCAT(a_Prefix,StreamGetReadable); \
1080	pThis->IHostAudio.pfnStreamGetWritable = RT_CONCAT(a_Prefix,StreamGetWritable); \
1081	pThis->IHostAudio.pfnStreamGetStatus = RT_CONCAT(a_Prefix,StreamGetStatus); \
1082	pThis->IHostAudio.pfnStreamIterate = RT_CONCAT(a_Prefix,StreamIterate); \
1083	pThis->IHostAudio.pfnStreamPlay = RT_CONCAT(a_Prefix,StreamPlay); \
1084	pThis->IHostAudio.pfnStreamCapture = RT_CONCAT(a_Prefix,StreamCapture); \
1085	} while (0)
1086
1087	/**
1088	* PDM host audio interface.
1089	*/
1090	typedef struct PDMIHOSTAUDIO
1091	{
1092	/**
1093	* Initializes the host backend (driver).
1094	*
1095	* @returns VBox status code.
1096	* @param pInterface Pointer to the interface structure containing the called function pointer.
1097	*/
1098	DECLR3CALLBACKMEMBER(int, pfnInit, (PPDMIHOSTAUDIO pInterface));
1099
1100	/**
1101	* Shuts down the host backend (driver).
1102	*
1103	* @returns VBox status code.
1104	* @param pInterface Pointer to the interface structure containing the called function pointer.
1105	*/
1106	DECLR3CALLBACKMEMBER(void, pfnShutdown, (PPDMIHOSTAUDIO pInterface));
1107
1108	/**
1109	* Returns the host backend's configuration (backend).
1110	*
1111	* @returns VBox status code.
1112	* @param pInterface Pointer to the interface structure containing the called function pointer.
1113	* @param pBackendCfg Where to store the backend audio configuration to.
1114	*/
1115	DECLR3CALLBACKMEMBER(int, pfnGetConfig, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDCFG pBackendCfg));
1116
1117	/**
1118	* Returns (enumerates) host audio device information.
1119	*
1120	* @returns VBox status code.
1121	* @param pInterface Pointer to the interface structure containing the called function pointer.
1122	* @param pDeviceEnum Where to return the enumerated audio devices.
1123	*/
1124	DECLR3CALLBACKMEMBER(int, pfnGetDevices, (PPDMIHOSTAUDIO pInterface, PPDMAUDIODEVICEENUM pDeviceEnum));
1125
1126	/**
1127	* Returns the current status from the audio backend.
1128	*
1129	* @returns PDMAUDIOBACKENDSTS enum.
1130	* @param pInterface Pointer to the interface structure containing the called function pointer.
1131	* @param enmDir Audio direction to get status for. Pass PDMAUDIODIR_ANY for overall status.
1132	*/
1133	DECLR3CALLBACKMEMBER(PDMAUDIOBACKENDSTS, pfnGetStatus, (PPDMIHOSTAUDIO pInterface, PDMAUDIODIR enmDir));
1134
1135	/**
1136	* Sets a callback the audio backend can call. Optional.
1137	*
1138	* @returns VBox status code.
1139	* @param pInterface Pointer to the interface structure containing the called function pointer.
1140	* @param pfnCallback The callback function to use, or NULL when unregistering.
1141	*/
1142	DECLR3CALLBACKMEMBER(int, pfnSetCallback, (PPDMIHOSTAUDIO pInterface, PFNPDMHOSTAUDIOCALLBACK pfnCallback));
1143
1144	/**
1145	* Creates an audio stream using the requested stream configuration.
1146	* If a backend is not able to create this configuration, it will return its best match in the acquired configuration
1147	* structure on success.
1148	*
1149	* @returns VBox status code.
1150	* @param pInterface Pointer to the interface structure containing the called function pointer.
1151	* @param pStream Pointer to audio stream.
1152	* @param pCfgReq Pointer to requested stream configuration.
1153	* @param pCfgAcq Pointer to acquired stream configuration.
1154	*/
1155	DECLR3CALLBACKMEMBER(int, pfnStreamCreate, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, PPDMAUDIOSTREAMCFG pCfgReq, PPDMAUDIOSTREAMCFG pCfgAcq));
1156
1157	/**
1158	* Destroys an audio stream.
1159	*
1160	* @returns VBox status code.
1161	* @param pInterface Pointer to the interface structure containing the called function pointer.
1162	* @param pStream Pointer to audio stream.
1163	*/
1164	DECLR3CALLBACKMEMBER(int, pfnStreamDestroy, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream));
1165
1166	/**
1167	* Controls an audio stream.
1168	*
1169	* @returns VBox status code.
1170	* @param pInterface Pointer to the interface structure containing the called function pointer.
1171	* @param pStream Pointer to audio stream.
1172	* @param enmStreamCmd The stream command to issue.
1173	*/
1174	DECLR3CALLBACKMEMBER(int, pfnStreamControl, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, PDMAUDIOSTREAMCMD enmStreamCmd));
1175
1176	/**
1177	* Returns the number of bytes which are readable from the audio (input) stream.
1178	*
1179	* @returns Number of readable bytes.
1180	* @param pInterface Pointer to the interface structure containing the called function pointer.
1181	* @param pStream Pointer to audio stream.
1182	*/
1183	DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetReadable, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream));
1184
1185	/**
1186	* Returns the number of bytes which are writable to the audio (output) stream.
1187	*
1188	* @returns Number of writable bytes.
1189	* @param pInterface Pointer to the interface structure containing the called function pointer.
1190	* @param pStream Pointer to audio stream.
1191	*/
1192	DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetWritable, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream));
1193
1194	/**
1195	* Returns whether the specified audio direction in the backend is enabled or not.
1196	*
1197	* @returns PDMAUDIOSTRMSTS
1198	* @param pInterface Pointer to the interface structure containing the called function pointer.
1199	* @param pStream Pointer to audio stream.
1200	*/
1201	DECLR3CALLBACKMEMBER(PDMAUDIOSTRMSTS, pfnStreamGetStatus, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream));
1202
1203	/**
1204	* Gives the host backend the chance to do some (necessary) iteration work.
1205	*
1206	* @returns VBox status code.
1207	* @param pInterface Pointer to the interface structure containing the called function pointer.
1208	* @param pStream Pointer to audio stream.
1209	*/
1210	DECLR3CALLBACKMEMBER(int, pfnStreamIterate, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream));
1211
1212	/**
1213	* Plays (writes to) an audio (output) stream.
1214	*
1215	* @returns VBox status code.
1216	* @param pInterface Pointer to the interface structure containing the called function pointer.
1217	* @param pStream Pointer to audio stream.
1218	* @param pvBuf Pointer to audio data buffer to play.
1219	* @param cbBuf Size (in bytes) of audio data buffer.
1220	* @param pcbWritten Returns number of bytes written. Optional.
1221	*/
1222	DECLR3CALLBACKMEMBER(int, pfnStreamPlay, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, const void pvBuf, uint32_t cbBuf, uint32_t pcbWritten));
1223
1224	/**
1225	* Captures (reads from) an audio (input) stream.
1226	*
1227	* @returns VBox status code.
1228	* @param pInterface Pointer to the interface structure containing the called function pointer.
1229	* @param pStream Pointer to audio stream.
1230	* @param pvBuf Buffer where to store read audio data.
1231	* @param cbBuf Size (in bytes) of buffer.
1232	* @param pcbRead Returns number of bytes read. Optional.
1233	*/
1234	DECLR3CALLBACKMEMBER(int, pfnStreamCapture, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, void pvBuf, uint32_t cbBuf, uint32_t pcbRead));
1235
1236	} PDMIHOSTAUDIO;
1237
1238	/** PDMIHOSTAUDIO interface ID. */
1239	#define PDMIHOSTAUDIO_IID "12DF859E-416A-4332-9980-A049AC70D187"
1240
1241	/** @} */
1242
1243	#endif /* !___VBox_vmm_pdmaudioifs_h */
1244

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source: vbox/trunk/include/VBox/vmm/pdmaudioifs.h@ 66581

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