/** @file * PDM - Pluggable Device Manager, audio interfaces. */ /* * Copyright (C) 2006-2019 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ /** * == Audio architecture overview * * The audio architecture mainly consists of two PDM interfaces, PDMAUDIOCONNECTOR * and PDMIHOSTAUDIO. * * The PDMAUDIOCONNECTOR interface is responsible of connecting a device emulation, such * as SB16, AC'97 and HDA to one or multiple audio backend(s). Its API abstracts audio * stream handling and I/O functions, device enumeration and so on. * * The PDMIHOSTAUDIO interface must be implemented by all audio backends to provide an * abstract and common way of accessing needed functions, such as transferring output audio * data for playing audio or recording input from the host. * * A device emulation can have one or more LUNs attached to it, whereas these LUNs in turn * then all have their own PDMIAUDIOCONNECTOR, making it possible to connect multiple backends * to a certain device emulation stream (multiplexing). * * An audio backend's job is to record and/or play audio data (depending on its capabilities). * It highly depends on the host it's running on and needs very specific (host-OS-dependent) code. * The backend itself only has very limited ways of accessing and/or communicating with the * PDMIAUDIOCONNECTOR interface via callbacks, but never directly with the device emulation or * other parts of the audio sub system. * * * == Mixing * * The AUDIOMIXER API is optionally available to create and manage virtual audio mixers. * Such an audio mixer in turn then can be used by the device emulation code to manage all * the multiplexing to/from the connected LUN audio streams. * * Currently only input and output stream are supported. Duplex stream are not supported yet. * * This also is handy if certain LUN audio streams should be added or removed during runtime. * * To create a group of either input or output streams the AUDMIXSINK API can be used. * * For example: The device emulation has one hardware output stream (HW0), and that output * stream shall be available to all connected LUN backends. For that to happen, * an AUDMIXSINK sink has to be created and attached to the device's AUDIOMIXER object. * * As every LUN has its own AUDMIXSTREAM object, adding all those objects to the * just created audio mixer sink will do the job. * * Note: The AUDIOMIXER API is purely optional and is not used by all currently implemented * device emulations (e.g. SB16). * * * == Data processing * * Audio input / output data gets handed-off to/from the device emulation in an unmodified * - that is, raw - way. The actual audio frame / sample conversion is done via the PDMAUDIOMIXBUF API. * * This concentrates the audio data processing in one place and makes it easier to test / benchmark * such code. * * A PDMAUDIOFRAME is the internal representation of a single audio frame, which consists of a single left * and right audio sample in time. Only mono (1) and stereo (2) channel(s) currently are supported. * * * == Timing * * Handling audio data in a virtual environment is hard, as the human perception is very sensitive * to the slightest cracks and stutters in the audible data. This can happen if the VM's timing is * lagging behind or not within the expected time frame. * * The two main components which unfortunately contradict each other is a) the audio device emulation * and b) the audio backend(s) on the host. Those need to be served in a timely manner to function correctly. * To make e.g. the device emulation rely on the pace the host backend(s) set - or vice versa - will not work, * as the guest's audio system / drivers then will not be able to compensate this accordingly. * * So each component, the device emulation, the audio connector(s) and the backend(s) must do its thing * *when* it needs to do it, independently of the others. For that we use various (small) ring buffers to * (hopefully) serve all components with the amount of data *when* they need it. * * Additionally, the device emulation can run with a different audio frame size, while the backends(s) may * require a different frame size (16 bit stereo -> 8 bit mono, for example). * * The device emulation can give the audio connector(s) a scheduling hint (optional), e.g. in which interval * it expects any data processing. * * A data transfer for playing audio data from the guest on the host looks like this: * (RB = Ring Buffer, MB = Mixing Buffer) * * (A) Device DMA -> (B) Device RB -> (C) Audio Connector Guest MB -> (D) Audio Connector Host MB -> \ * (E) Backend RB (optional, up to the backend) > (F) Backend audio framework * * For capturing audio data the above chain is similar, just in a different direction, of course. * * The audio connector hereby plays a key role when it comes to (pre-) buffering data to minimize any audio stutters * and/or cracks. The following values, which also can be tweaked via CFGM / extra-data are available: * * - The pre-buffering time (in ms): Audio data which needs to be buffered before any playback (or capturing) can happen. * - The actual buffer size (in ms): How big the mixing buffer (for C and D) will be. * - The period size (in ms): How big a chunk of audio (often called period or fragment) for F must be to get handled correctly. * * The above values can be set on a per-driver level, whereas input and output streams for a driver also can be handled * set independently. The verbose audio (release) log will tell about the (final) state of each audio stream. * * * == Diagram * * +-------------------------+ * +-------------------------+ +-------------------------+ +-------------------+ * |PDMAUDIOSTREAM | |PDMAUDIOCONNECTOR | + ++|LUN | * |-------------------------| |-------------------------| | |||-------------------| * |PDMAUDIOMIXBUF |+------>|PDMAUDIOSTREAM Host |+---|-|||PDMIAUDIOCONNECTOR | * |PDMAUDIOSTREAMCFG |+------>|PDMAUDIOSTREAM Guest | | |||AUDMIXSTREAM | * | | |Device capabilities | | ||| | * | | |Device configuration | | ||| | * | | | | | ||| | * | | +|PDMIHOSTAUDIO | | ||| | * | | ||+-----------------------+| | ||+-------------------+ * +-------------------------+ |||Backend storage space || | || * ||+-----------------------+| | || * |+-------------------------+ | || * | | || * +---------------------+ | | || * |PDMIHOSTAUDIO | | | || * |+--------------+ | | +-------------------+ | || +-------------+ * ||DirectSound | | | |AUDMIXSINK | | || |AUDIOMIXER | * |+--------------+ | | |-------------------| | || |-------------| * | | | |AUDMIXSTREAM0 |+---|-||----->|AUDMIXSINK0 | * |+--------------+ | | |AUDMIXSTREAM1 |+---|-||----->|AUDMIXSINK1 | * ||PulseAudio | | | |AUDMIXSTREAMn |+---|-||----->|AUDMIXSINKn | * |+--------------+ |+----------+ +-------------------+ | || +-------------+ * | | | || * |+--------------+ | | || * ||Core Audio | | | || * |+--------------+ | | || * | | | || * | | | ||+----------------------------------+ * | | | |||Device (SB16 / AC'97 / HDA) | * | | | |||----------------------------------| * +---------------------+ | |||AUDIOMIXER (Optional) | * | |||AUDMIXSINK0 (Optional) | * | |||AUDMIXSINK1 (Optional) | * | |||AUDMIXSINKn (Optional) | * | ||| | * | |+|LUN0 | * | ++|LUN1 | * +--+|LUNn | * | | * | | * | | * +----------------------------------+ */ #ifndef VBOX_INCLUDED_vmm_pdmaudioifs_h #define VBOX_INCLUDED_vmm_pdmaudioifs_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include #include #include #include #ifdef VBOX_WITH_STATISTICS # include #endif /** @defgroup grp_pdm_ifs_audio PDM Audio Interfaces * @ingroup grp_pdm_interfaces * @{ */ #ifndef VBOX_AUDIO_DEBUG_DUMP_PCM_DATA_PATH # ifdef RT_OS_WINDOWS # define VBOX_AUDIO_DEBUG_DUMP_PCM_DATA_PATH "c:\\temp\\" # else # define VBOX_AUDIO_DEBUG_DUMP_PCM_DATA_PATH "/tmp/" # endif #endif /** PDM audio driver instance flags. */ typedef uint32_t PDMAUDIODRVFLAGS; /** No flags set. */ #define PDMAUDIODRVFLAGS_NONE 0 /** Marks a primary audio driver which is critical * when running the VM. */ #define PDMAUDIODRVFLAGS_PRIMARY RT_BIT(0) /** * Audio format in signed or unsigned variants. */ typedef enum PDMAUDIOFMT { /** Invalid format, do not use. */ PDMAUDIOFMT_INVALID, /** 8-bit, unsigned. */ PDMAUDIOFMT_U8, /** 8-bit, signed. */ PDMAUDIOFMT_S8, /** 16-bit, unsigned. */ PDMAUDIOFMT_U16, /** 16-bit, signed. */ PDMAUDIOFMT_S16, /** 32-bit, unsigned. */ PDMAUDIOFMT_U32, /** 32-bit, signed. */ PDMAUDIOFMT_S32, /** Hack to blow the type up to 32-bit. */ PDMAUDIOFMT_32BIT_HACK = 0x7fffffff } PDMAUDIOFMT; /** * Audio direction. */ typedef enum PDMAUDIODIR { /** Unknown direction. */ PDMAUDIODIR_UNKNOWN = 0, /** Input. */ PDMAUDIODIR_IN = 1, /** Output. */ PDMAUDIODIR_OUT = 2, /** Duplex handling. */ PDMAUDIODIR_ANY = 3, /** Hack to blow the type up to 32-bit. */ PDMAUDIODIR_32BIT_HACK = 0x7fffffff } PDMAUDIODIR; /** Device latency spec in milliseconds (ms). */ typedef uint32_t PDMAUDIODEVLATSPECMS; /** Device latency spec in seconds (s). */ typedef uint32_t PDMAUDIODEVLATSPECSEC; /** Audio device flags. Use with PDMAUDIODEV_FLAG_ flags. */ typedef uint32_t PDMAUDIODEVFLAG; /** No flags set. */ #define PDMAUDIODEV_FLAGS_NONE 0 /** The device marks the default device within the host OS. */ #define PDMAUDIODEV_FLAGS_DEFAULT RT_BIT(0) /** The device can be removed at any time and we have to deal with it. */ #define PDMAUDIODEV_FLAGS_HOTPLUG RT_BIT(1) /** The device is known to be buggy and needs special treatment. */ #define PDMAUDIODEV_FLAGS_BUGGY RT_BIT(2) /** Ignore the device, no matter what. */ #define PDMAUDIODEV_FLAGS_IGNORE RT_BIT(3) /** The device is present but marked as locked by some other application. */ #define PDMAUDIODEV_FLAGS_LOCKED RT_BIT(4) /** The device is present but not in an alive state (dead). */ #define PDMAUDIODEV_FLAGS_DEAD RT_BIT(5) /** * Audio device type. */ typedef enum PDMAUDIODEVICETYPE { /** Unknown device type. This is the default. */ PDMAUDIODEVICETYPE_UNKNOWN = 0, /** Dummy device; for backends which are not able to report * actual device information (yet). */ PDMAUDIODEVICETYPE_DUMMY, /** The device is built into the host (non-removable). */ PDMAUDIODEVICETYPE_BUILTIN, /** The device is an (external) USB device. */ PDMAUDIODEVICETYPE_USB, /** Hack to blow the type up to 32-bit. */ PDMAUDIODEVICETYPE_32BIT_HACK = 0x7fffffff } PDMAUDIODEVICETYPE; /** * Audio device instance data. */ typedef struct PDMAUDIODEVICE { /** List node. */ RTLISTNODE Node; /** Friendly name of the device, if any. */ char szName[64]; /** The device type. */ PDMAUDIODEVICETYPE enmType; /** Reference count indicating how many audio streams currently are relying on this device. */ uint8_t cRefCount; /** Usage of the device. */ PDMAUDIODIR enmUsage; /** Device flags. */ PDMAUDIODEVFLAG fFlags; /** Maximum number of input audio channels the device supports. */ uint8_t cMaxInputChannels; /** Maximum number of output audio channels the device supports. */ uint8_t cMaxOutputChannels; /** Additional data which might be relevant for the current context. */ void *pvData; /** Size of the additional data. */ size_t cbData; /** Device type union, based on enmType. */ union { /** USB type specifics. */ struct { /** Vendor ID. */ int16_t VID; /** Product ID. */ int16_t PID; } USB; } Type; } PDMAUDIODEVICE, *PPDMAUDIODEVICE; /** * Structure for keeping an audio device enumeration. */ typedef struct PDMAUDIODEVICEENUM { /** Number of audio devices in the list. */ uint16_t cDevices; /** List of audio devices. */ RTLISTANCHOR lstDevices; } PDMAUDIODEVICEENUM, *PPDMAUDIODEVICEENUM; /** * Audio (static) configuration of an audio host backend. */ typedef struct PDMAUDIOBACKENDCFG { /** The backend's friendly name. */ char szName[32]; /** Size (in bytes) of the host backend's audio output stream structure. */ size_t cbStreamOut; /** Size (in bytes) of the host backend's audio input stream structure. */ size_t cbStreamIn; /** Number of concurrent output (playback) streams supported on the host. * UINT32_MAX for unlimited concurrent streams, 0 if no concurrent input streams are supported. */ uint32_t cMaxStreamsOut; /** Number of concurrent input (recording) streams supported on the host. * UINT32_MAX for unlimited concurrent streams, 0 if no concurrent input streams are supported. */ uint32_t cMaxStreamsIn; } PDMAUDIOBACKENDCFG, *PPDMAUDIOBACKENDCFG; /** * A single audio frame. * * Currently only two (2) channels, left and right, are supported. * * Note: When changing this structure, make sure to also handle * VRDP's input / output processing in DrvAudioVRDE, as VRDP * expects audio data in st_sample_t format (historical reasons) * which happens to be the same as PDMAUDIOFRAME for now. */ typedef struct PDMAUDIOFRAME { /** Left channel. */ int64_t i64LSample; /** Right channel. */ int64_t i64RSample; } PDMAUDIOFRAME; /** Pointer to a single (stereo) audio frame. */ typedef PDMAUDIOFRAME *PPDMAUDIOFRAME; /** Pointer to a const single (stereo) audio frame. */ typedef PDMAUDIOFRAME const *PCPDMAUDIOFRAME; typedef enum PDMAUDIOENDIANNESS { /** The usual invalid endian. */ PDMAUDIOENDIANNESS_INVALID, /** Little endian. */ PDMAUDIOENDIANNESS_LITTLE, /** Bit endian. */ PDMAUDIOENDIANNESS_BIG, /** Endianness doesn't have a meaning in the context. */ PDMAUDIOENDIANNESS_NA, /** The end of the valid endian values (exclusive). */ PDMAUDIOENDIANNESS_END, /** Hack to blow the type up to 32-bit. */ PDMAUDIOENDIANNESS_32BIT_HACK = 0x7fffffff } PDMAUDIOENDIANNESS; /** * Audio playback destinations. */ typedef enum PDMAUDIOPLAYBACKDEST { /** Unknown destination. */ PDMAUDIOPLAYBACKDEST_UNKNOWN = 0, /** Front channel. */ PDMAUDIOPLAYBACKDEST_FRONT, /** Center / LFE (Subwoofer) channel. */ PDMAUDIOPLAYBACKDEST_CENTER_LFE, /** Rear channel. */ PDMAUDIOPLAYBACKDEST_REAR, /** Hack to blow the type up to 32-bit. */ PDMAUDIOPLAYBACKDEST_32BIT_HACK = 0x7fffffff } PDMAUDIOPLAYBACKDEST; /** * Audio recording sources. */ typedef enum PDMAUDIORECSOURCE { /** Unknown recording source. */ PDMAUDIORECSOURCE_UNKNOWN = 0, /** Microphone-In. */ PDMAUDIORECSOURCE_MIC, /** CD. */ PDMAUDIORECSOURCE_CD, /** Video-In. */ PDMAUDIORECSOURCE_VIDEO, /** AUX. */ PDMAUDIORECSOURCE_AUX, /** Line-In. */ PDMAUDIORECSOURCE_LINE, /** Phone-In. */ PDMAUDIORECSOURCE_PHONE, /** Hack to blow the type up to 32-bit. */ PDMAUDIORECSOURCE_32BIT_HACK = 0x7fffffff } PDMAUDIORECSOURCE; /** * Audio stream (data) layout. */ typedef enum PDMAUDIOSTREAMLAYOUT { /** Unknown access type; do not use. */ PDMAUDIOSTREAMLAYOUT_UNKNOWN = 0, /** Non-interleaved access, that is, consecutive * access to the data. */ PDMAUDIOSTREAMLAYOUT_NON_INTERLEAVED, /** Interleaved access, where the data can be * mixed together with data of other audio streams. */ PDMAUDIOSTREAMLAYOUT_INTERLEAVED, /** Complex layout, which does not fit into the * interleaved / non-interleaved layouts. */ PDMAUDIOSTREAMLAYOUT_COMPLEX, /** Raw (pass through) data, with no data layout processing done. * * This means that this stream will operate on PDMAUDIOFRAME data * directly. Don't use this if you don't have to. */ PDMAUDIOSTREAMLAYOUT_RAW, /** Hack to blow the type up to 32-bit. */ PDMAUDIOSTREAMLAYOUT_32BIT_HACK = 0x7fffffff } PDMAUDIOSTREAMLAYOUT, *PPDMAUDIOSTREAMLAYOUT; /** No stream channel data flags defined. */ #define PDMAUDIOSTREAMCHANNELDATA_FLAG_NONE 0 /** * Structure for keeping a stream channel data block around. */ typedef struct PDMAUDIOSTREAMCHANNELDATA { /** Circular buffer for the channel data. */ PRTCIRCBUF pCircBuf; /** Amount of audio data (in bytes) acquired for reading. */ size_t cbAcq; /** Channel data flags. */ uint32_t fFlags; } PDMAUDIOSTREAMCHANNELDATA, *PPDMAUDIOSTREAMCHANNELDATA; /** * Enumeration for standard speaker channel IDs. * This can cover up to 11.0 surround sound. * * Note: Any of those channels can be marked / used as the LFE channel (played through the subwoofer). */ typedef enum PDMAUDIOSTREAMCHANNELID { /** Unknown / not set channel ID. */ PDMAUDIOSTREAMCHANNELID_UNKNOWN = 0, /** Front left channel. */ PDMAUDIOSTREAMCHANNELID_FRONT_LEFT, /** Front right channel. */ PDMAUDIOSTREAMCHANNELID_FRONT_RIGHT, /** Front center channel. */ PDMAUDIOSTREAMCHANNELID_FRONT_CENTER, /** Low frequency effects (subwoofer) channel. */ PDMAUDIOSTREAMCHANNELID_LFE, /** Rear left channel. */ PDMAUDIOSTREAMCHANNELID_REAR_LEFT, /** Rear right channel. */ PDMAUDIOSTREAMCHANNELID_REAR_RIGHT, /** Front left of center channel. */ PDMAUDIOSTREAMCHANNELID_FRONT_LEFT_OF_CENTER, /** Front right of center channel. */ PDMAUDIOSTREAMCHANNELID_FRONT_RIGHT_OF_CENTER, /** Rear center channel. */ PDMAUDIOSTREAMCHANNELID_REAR_CENTER, /** Side left channel. */ PDMAUDIOSTREAMCHANNELID_SIDE_LEFT, /** Side right channel. */ PDMAUDIOSTREAMCHANNELID_SIDE_RIGHT, /** Left height channel. */ PDMAUDIOSTREAMCHANNELID_LEFT_HEIGHT, /** Right height channel. */ PDMAUDIOSTREAMCHANNELID_RIGHT_HEIGHT, /** Hack to blow the type up to 32-bit. */ PDMAUDIOSTREAMCHANNELID_32BIT_HACK = 0x7fffffff } PDMAUDIOSTREAMCHANNELID; /** * Structure for mapping a single (mono) channel or dual (stereo) channels of an audio stream (aka stream profile). * * An audio stream consists of one or multiple channels (e.g. 1 for mono, 2 for stereo), * depending on the configuration. */ typedef struct PDMAUDIOSTREAMMAP { /** Array of channel IDs being handled. * Note: The first (zero-based) index specifies the leftmost channel. */ PDMAUDIOSTREAMCHANNELID aID[2]; /** Step size (in bytes) to the channel's next frame. */ size_t cbSize; /** Frame size (in bytes) of this channel. */ size_t cbFrame; /** Offset (in bytes) to first frame in the data block. */ size_t cbFirst; /** Offset (in bytes) to the next frame in the data block. */ size_t cbOff; /** Associated data buffer. */ PDMAUDIOSTREAMCHANNELDATA Data; } PDMAUDIOSTREAMMAP, *PPDMAUDIOSTREAMMAP; /** * Union for keeping an audio stream destination or source. */ typedef union PDMAUDIODESTSOURCE { /** Desired playback destination (for an output stream). */ PDMAUDIOPLAYBACKDEST Dest; /** Desired recording source (for an input stream). */ PDMAUDIORECSOURCE Source; } PDMAUDIODESTSOURCE, *PPDMAUDIODESTSOURCE; /** * Properties of audio streams for host/guest for in or out directions. */ typedef struct PDMAUDIOPCMPROPS { /** Sample width (in bytes). */ uint8_t cBytes; /** Number of audio channels. */ uint8_t cChannels; /** Shift count used for faster calculation of various * values, such as the alignment, bytes to frames and so on. * Depends on number of stream channels and the stream format * being used. * ** @todo Use some RTAsmXXX functions instead? */ uint8_t cShift; /** Signed or unsigned sample. */ bool fSigned : 1; /** Whether the endianness is swapped or not. */ bool fSwapEndian : 1; /** Sample frequency in Hertz (Hz). */ uint32_t uHz; } PDMAUDIOPCMPROPS; AssertCompileSizeAlignment(PDMAUDIOPCMPROPS, 8); /** Pointer to audio stream properties. */ typedef PDMAUDIOPCMPROPS *PPDMAUDIOPCMPROPS; /** Initializor for PDMAUDIOPCMPROPS. */ #define PDMAUDIOPCMPROPS_INITIALIZOR(a_cBytes, a_fSigned, a_cCannels, a_uHz, a_cShift, a_fSwapEndian) \ { a_cBytes, a_cCannels, a_cShift, a_fSigned, a_fSwapEndian, a_uHz } /** Calculates the cShift value of given sample bits and audio channels. * Note: Does only support mono/stereo channels for now. */ #define PDMAUDIOPCMPROPS_MAKE_SHIFT_PARMS(cBytes, cChannels) ((cChannels == 2) + (cBytes / 2)) /** Calculates the cShift value of a PDMAUDIOPCMPROPS structure. */ #define PDMAUDIOPCMPROPS_MAKE_SHIFT(pProps) PDMAUDIOPCMPROPS_MAKE_SHIFT_PARMS((pProps)->cBytes, (pProps)->cChannels) /** Converts (audio) frames to bytes. * Needs the cShift value set correctly, using PDMAUDIOPCMPROPS_MAKE_SHIFT. */ #define PDMAUDIOPCMPROPS_F2B(pProps, frames) ((frames) << (pProps)->cShift) /** Converts bytes to (audio) frames. * Needs the cShift value set correctly, using PDMAUDIOPCMPROPS_MAKE_SHIFT. */ #define PDMAUDIOPCMPROPS_B2F(pProps, cb) (cb >> (pProps)->cShift) /** * Structure for keeping an audio stream configuration. */ typedef struct PDMAUDIOSTREAMCFG { /** Friendly name of the stream. */ char szName[64]; /** Direction of the stream. */ PDMAUDIODIR enmDir; /** Destination / source indicator, depending on enmDir. */ PDMAUDIODESTSOURCE DestSource; /** The stream's PCM properties. */ PDMAUDIOPCMPROPS Props; /** The stream's audio data layout. * This indicates how the audio data buffers to/from the backend is being layouted. * * Currently, the following layouts are supported by the audio connector: * * PDMAUDIOSTREAMLAYOUT_NON_INTERLEAVED: * One stream at once. The consecutive audio data is exactly in the format and frame width * like defined in the PCM properties. This is the default. * * PDMAUDIOSTREAMLAYOUT_RAW: * Can be one or many streams at once, depending on the stream's mixing buffer setup. * The audio data will get handled as PDMAUDIOFRAME frames without any modification done. */ PDMAUDIOSTREAMLAYOUT enmLayout; /** Device emulation-specific data needed for the audio connector. */ struct { /** Scheduling hint set by the device emulation about when this stream is being served on average (in ms). * Can be 0 if not hint given or some other mechanism (e.g. callbacks) is being used. */ uint32_t uSchedulingHintMs; } Device; /** * Backend-specific data for the stream. * On input (requested configuration) those values are set by the audio connector to let the backend know what we expect. * On output (acquired configuration) those values reflect the values set and used by the backend. * Set by the backend on return. Not all backends support all values / features. */ struct { /** Period size of the stream (in audio frames). * This value reflects the number of audio frames in between each hardware interrupt on the * backend (host) side. 0 if not set / available by the backend. */ uint32_t cfPeriod; /** (Ring) buffer size (in audio frames). Often is a multiple of cfPeriod. * 0 if not set / available by the backend. */ uint32_t cfBufferSize; /** Pre-buffering size (in audio frames). Frames needed in buffer before the stream becomes active (pre buffering). * The bigger this value is, the more latency for the stream will occur. * 0 if not set / available by the backend. UINT32_MAX if not defined (yet). */ uint32_t cfPreBuf; } Backend; } PDMAUDIOSTREAMCFG; AssertCompileSizeAlignment(PDMAUDIOPCMPROPS, 8); /** Pointer to audio stream configuration keeper. */ typedef PDMAUDIOSTREAMCFG *PPDMAUDIOSTREAMCFG; /** Converts (audio) frames to bytes. */ #define PDMAUDIOSTREAMCFG_F2B(pCfg, frames) ((frames) << (pCfg->Props).cShift) /** Converts bytes to (audio) frames. */ #define PDMAUDIOSTREAMCFG_B2F(pCfg, cb) (cb >> (pCfg->Props).cShift) #if defined(RT_LITTLE_ENDIAN) # define PDMAUDIOHOSTENDIANNESS PDMAUDIOENDIANNESS_LITTLE #elif defined(RT_BIG_ENDIAN) # define PDMAUDIOHOSTENDIANNESS PDMAUDIOENDIANNESS_BIG #else # error "Port me!" #endif /** * Audio mixer controls. */ typedef enum PDMAUDIOMIXERCTL { /** Unknown mixer control. */ PDMAUDIOMIXERCTL_UNKNOWN = 0, /** Master volume. */ PDMAUDIOMIXERCTL_VOLUME_MASTER, /** Front. */ PDMAUDIOMIXERCTL_FRONT, /** Center / LFE (Subwoofer). */ PDMAUDIOMIXERCTL_CENTER_LFE, /** Rear. */ PDMAUDIOMIXERCTL_REAR, /** Line-In. */ PDMAUDIOMIXERCTL_LINE_IN, /** Microphone-In. */ PDMAUDIOMIXERCTL_MIC_IN, /** Hack to blow the type up to 32-bit. */ PDMAUDIOMIXERCTL_32BIT_HACK = 0x7fffffff } PDMAUDIOMIXERCTL; /** * Audio stream commands. Used in the audio connector * as well as in the actual host backends. */ typedef enum PDMAUDIOSTREAMCMD { /** Unknown command, do not use. */ PDMAUDIOSTREAMCMD_UNKNOWN = 0, /** Enables the stream. */ PDMAUDIOSTREAMCMD_ENABLE, /** Disables the stream. * For output streams this stops the stream after playing the remaining (buffered) audio data. * For input streams this will deliver the remaining (captured) audio data and not accepting * any new audio input data afterwards. */ PDMAUDIOSTREAMCMD_DISABLE, /** Pauses the stream. */ PDMAUDIOSTREAMCMD_PAUSE, /** Resumes the stream. */ PDMAUDIOSTREAMCMD_RESUME, /** Tells the stream to drain itself. * For output streams this plays all remaining (buffered) audio frames, * for input streams this permits receiving any new audio frames. * No supported by all backends. */ PDMAUDIOSTREAMCMD_DRAIN, /** Tells the stream to drop all (buffered) audio data immediately. * No supported by all backends. */ PDMAUDIOSTREAMCMD_DROP, /** Hack to blow the type up to 32-bit. */ PDMAUDIOSTREAMCMD_32BIT_HACK = 0x7fffffff } PDMAUDIOSTREAMCMD; /** * Audio volume parameters. */ typedef struct PDMAUDIOVOLUME { /** Set to @c true if this stream is muted, @c false if not. */ bool fMuted; /** Left channel volume. * Range is from [0 ... 255], whereas 0 specifies * the most silent and 255 the loudest value. */ uint8_t uLeft; /** Right channel volume. * Range is from [0 ... 255], whereas 0 specifies * the most silent and 255 the loudest value. */ uint8_t uRight; } PDMAUDIOVOLUME, *PPDMAUDIOVOLUME; /** Defines the minimum volume allowed. */ #define PDMAUDIO_VOLUME_MIN (0) /** Defines the maximum volume allowed. */ #define PDMAUDIO_VOLUME_MAX (255) /** * Structure for holding rate processing information * of a source + destination audio stream. This is needed * because both streams can differ regarding their rates * and therefore need to be treated accordingly. */ typedef struct PDMAUDIOSTREAMRATE { /** Current (absolute) offset in the output * (destination) stream. */ uint64_t dstOffset; /** Increment for moving dstOffset for the * destination stream. This is needed because the * source <-> destination rate might be different. */ uint64_t dstInc; /** Current (absolute) offset in the input * stream. */ uint32_t srcOffset; /** Last processed frame of the input stream. * Needed for interpolation. */ PDMAUDIOFRAME srcFrameLast; } PDMAUDIOSTREAMRATE, *PPDMAUDIOSTREAMRATE; /** * Structure for holding mixing buffer volume parameters. * The volume values are in fixed point style and must * be converted to/from before using with e.g. PDMAUDIOVOLUME. */ typedef struct PDMAUDMIXBUFVOL { /** Set to @c true if this stream is muted, @c false if not. */ bool fMuted; /** Left volume to apply during conversion. Pass 0 * to convert the original values. May not apply to * all conversion functions. */ uint32_t uLeft; /** Right volume to apply during conversion. Pass 0 * to convert the original values. May not apply to * all conversion functions. */ uint32_t uRight; } PDMAUDMIXBUFVOL, *PPDMAUDMIXBUFVOL; /** * Structure for holding frame conversion parameters for * the audioMixBufConvFromXXX / audioMixBufConvToXXX macros. */ typedef struct PDMAUDMIXBUFCONVOPTS { /** Number of audio frames to convert. */ uint32_t cFrames; union { struct { /** Volume to use for conversion. */ PDMAUDMIXBUFVOL Volume; } From; } RT_UNION_NM(u); } PDMAUDMIXBUFCONVOPTS; /** Pointer to conversion parameters for the audio mixer. */ typedef PDMAUDMIXBUFCONVOPTS *PPDMAUDMIXBUFCONVOPTS; /** Pointer to const conversion parameters for the audio mixer. */ typedef PDMAUDMIXBUFCONVOPTS const *PCPDMAUDMIXBUFCONVOPTS; /** * Note: All internal handling is done in audio frames, * not in bytes! */ typedef uint32_t PDMAUDIOMIXBUFFMT; typedef PDMAUDIOMIXBUFFMT *PPDMAUDIOMIXBUFFMT; /** * Convertion-from function used by the PDM audio buffer mixer. * * @returns Number of audio frames returned. * @param paDst Where to return the converted frames. * @param pvSrc The source frame bytes. * @param cbSrc Number of bytes to convert. * @param pOpts Conversion options. */ typedef DECLCALLBACK(uint32_t) FNPDMAUDIOMIXBUFCONVFROM(PPDMAUDIOFRAME paDst, const void *pvSrc, uint32_t cbSrc, PCPDMAUDMIXBUFCONVOPTS pOpts); /** Pointer to a convertion-from function used by the PDM audio buffer mixer. */ typedef FNPDMAUDIOMIXBUFCONVFROM *PFNPDMAUDIOMIXBUFCONVFROM; /** * Convertion-to function used by the PDM audio buffer mixer. * * @param pvDst Output buffer. * @param paSrc The input frames. * @param pOpts Conversion options. */ typedef DECLCALLBACK(void) FNPDMAUDIOMIXBUFCONVTO(void *pvDst, PCPDMAUDIOFRAME paSrc, PCPDMAUDMIXBUFCONVOPTS pOpts); /** Pointer to a convertion-to function used by the PDM audio buffer mixer. */ typedef FNPDMAUDIOMIXBUFCONVTO *PFNPDMAUDIOMIXBUFCONVTO; typedef struct PDMAUDIOMIXBUF *PPDMAUDIOMIXBUF; typedef struct PDMAUDIOMIXBUF { RTLISTNODE Node; /** Name of the buffer. */ char *pszName; /** Frame buffer. */ PPDMAUDIOFRAME pFrames; /** Size of the frame buffer (in audio frames). */ uint32_t cFrames; /** The current read position (in frames). */ uint32_t offRead; /** The current write position (in frames). */ uint32_t offWrite; /** * Total frames already mixed down to the parent buffer (if any). Always starting at * the parent's offRead position. * * Note: Count always is specified in parent frames, as the sample count can differ between parent * and child. */ uint32_t cMixed; /** How much audio frames are currently being used * in this buffer. * Note: This also is known as the distance in ring buffer terms. */ uint32_t cUsed; /** Pointer to parent buffer (if any). */ PPDMAUDIOMIXBUF pParent; /** List of children mix buffers to keep in sync with (if being a parent buffer). */ RTLISTANCHOR lstChildren; /** Number of children mix buffers kept in lstChildren. */ uint32_t cChildren; /** Intermediate structure for buffer conversion tasks. */ PPDMAUDIOSTREAMRATE pRate; /** Internal representation of current volume used for mixing. */ PDMAUDMIXBUFVOL Volume; /** This buffer's audio format. */ PDMAUDIOMIXBUFFMT AudioFmt; /** Standard conversion-to function for set AudioFmt. */ PFNPDMAUDIOMIXBUFCONVTO pfnConvTo; /** Standard conversion-from function for set AudioFmt. */ PFNPDMAUDIOMIXBUFCONVFROM pfnConvFrom; /** * Ratio of the associated parent stream's frequency by this stream's * frequency (1<<32), represented as a signed 64 bit integer. * * For example, if the parent stream has a frequency of 44 khZ, and this * stream has a frequency of 11 kHz, the ration then would be * (44/11 * (1 << 32)). * * Currently this does not get changed once assigned. */ int64_t iFreqRatio; /** For quickly converting frames <-> bytes and vice versa. */ uint8_t cShift; } PDMAUDIOMIXBUF; typedef uint32_t PDMAUDIOFILEFLAGS; /** No flags defined. */ #define PDMAUDIOFILE_FLAG_NONE 0 /** Keep the audio file even if it contains no audio data. */ #define PDMAUDIOFILE_FLAG_KEEP_IF_EMPTY RT_BIT(0) /** Audio file flag validation mask. */ #define PDMAUDIOFILE_FLAG_VALID_MASK 0x1 /** Audio file default open flags. */ #define PDMAUDIOFILE_DEFAULT_OPEN_FLAGS (RTFILE_O_OPEN_CREATE | RTFILE_O_APPEND | RTFILE_O_WRITE | RTFILE_O_DENY_WRITE) /** * Audio file types. */ typedef enum PDMAUDIOFILETYPE { /** Unknown type, do not use. */ PDMAUDIOFILETYPE_UNKNOWN = 0, /** Raw (PCM) file. */ PDMAUDIOFILETYPE_RAW, /** Wave (.WAV) file. */ PDMAUDIOFILETYPE_WAV, /** Hack to blow the type up to 32-bit. */ PDMAUDIOFILETYPE_32BIT_HACK = 0x7fffffff } PDMAUDIOFILETYPE; typedef uint32_t PDMAUDIOFILENAMEFLAGS; /** No flags defined. */ #define PDMAUDIOFILENAME_FLAG_NONE 0 /** Adds an ISO timestamp to the file name. */ #define PDMAUDIOFILENAME_FLAG_TS RT_BIT(0) /** * Structure for an audio file handle. */ typedef struct PDMAUDIOFILE { /** Type of the audio file. */ PDMAUDIOFILETYPE enmType; /** Audio file flags. */ PDMAUDIOFILEFLAGS fFlags; /** File name and path. */ char szName[RTPATH_MAX + 1]; /** Actual file handle. */ RTFILE hFile; /** Data needed for the specific audio file type implemented. * Optional, can be NULL. */ void *pvData; /** Data size (in bytes). */ size_t cbData; } PDMAUDIOFILE, *PPDMAUDIOFILE; /** Stream status flag. To be used with PDMAUDIOSTRMSTS_FLAG_ flags. */ typedef uint32_t PDMAUDIOSTREAMSTS; /** No flags being set. */ #define PDMAUDIOSTREAMSTS_FLAG_NONE 0 /** Whether this stream has been initialized by the * backend or not. */ #define PDMAUDIOSTREAMSTS_FLAG_INITIALIZED RT_BIT_32(0) /** Whether this stream is enabled or disabled. */ #define PDMAUDIOSTREAMSTS_FLAG_ENABLED RT_BIT_32(1) /** Whether this stream has been paused or not. This also implies * that this is an enabled stream! */ #define PDMAUDIOSTREAMSTS_FLAG_PAUSED RT_BIT_32(2) /** Whether this stream was marked as being disabled * but there are still associated guest output streams * which rely on its data. */ #define PDMAUDIOSTREAMSTS_FLAG_PENDING_DISABLE RT_BIT_32(3) /** Whether this stream is in re-initialization phase. * All other bits remain untouched to be able to restore * the stream's state after the re-initialization bas been * finished. */ #define PDMAUDIOSTREAMSTS_FLAG_PENDING_REINIT RT_BIT_32(4) /** Validation mask. */ #define PDMAUDIOSTREAMSTS_VALID_MASK UINT32_C(0x0000001F) /** * Enumeration presenting a backend's current status. */ typedef enum PDMAUDIOBACKENDSTS { /** Unknown/invalid status. */ PDMAUDIOBACKENDSTS_UNKNOWN = 0, /** No backend attached. */ PDMAUDIOBACKENDSTS_NOT_ATTACHED, /** The backend is in its initialization phase. * Not all backends support this status. */ PDMAUDIOBACKENDSTS_INITIALIZING, /** The backend has stopped its operation. */ PDMAUDIOBACKENDSTS_STOPPED, /** The backend is up and running. */ PDMAUDIOBACKENDSTS_RUNNING, /** The backend ran into an error and is unable to recover. * A manual re-initialization might help. */ PDMAUDIOBACKENDSTS_ERROR, /** Hack to blow the type up to 32-bit. */ PDMAUDIOBACKENDSTS_32BIT_HACK = 0x7fffffff } PDMAUDIOBACKENDSTS; /** * Structure for keeping audio input stream specifics. * Do not use directly. Instead, use PDMAUDIOSTREAM. */ typedef struct PDMAUDIOSTREAMIN { #ifdef VBOX_WITH_STATISTICS struct { STAMCOUNTER TotalFramesCaptured; STAMCOUNTER AvgFramesCaptured; STAMCOUNTER TotalTimesCaptured; STAMCOUNTER TotalFramesRead; STAMCOUNTER AvgFramesRead; STAMCOUNTER TotalTimesRead; } Stats; #endif struct { /** File for writing stream reads. */ PPDMAUDIOFILE pFileStreamRead; /** File for writing non-interleaved captures. */ PPDMAUDIOFILE pFileCaptureNonInterleaved; } Dbg; } PDMAUDIOSTREAMIN, *PPDMAUDIOSTREAMIN; /** * Structure for keeping audio output stream specifics. * Do not use directly. Instead, use PDMAUDIOSTREAM. */ typedef struct PDMAUDIOSTREAMOUT { #ifdef VBOX_WITH_STATISTICS struct { STAMCOUNTER TotalFramesPlayed; STAMCOUNTER AvgFramesPlayed; STAMCOUNTER TotalTimesPlayed; STAMCOUNTER TotalFramesWritten; STAMCOUNTER AvgFramesWritten; STAMCOUNTER TotalTimesWritten; } Stats; #endif struct { /** File for writing stream writes. */ PPDMAUDIOFILE pFileStreamWrite; /** File for writing stream playback. */ PPDMAUDIOFILE pFilePlayNonInterleaved; } Dbg; } PDMAUDIOSTREAMOUT, *PPDMAUDIOSTREAMOUT; /** Pointer to an audio stream. */ typedef struct PDMAUDIOSTREAM *PPDMAUDIOSTREAM; /** * Audio stream context. * Needed for separating data from the guest and host side (per stream). */ typedef struct PDMAUDIOSTREAMCTX { /** The stream's audio configuration. */ PDMAUDIOSTREAMCFG Cfg; /** This stream's mixing buffer. */ PDMAUDIOMIXBUF MixBuf; } PDMAUDIOSTREAMCTX; /** Pointer to an audio stream context. */ typedef struct PDMAUDIOSTREAM *PPDMAUDIOSTREAMCTX; /** * Structure for maintaining an input/output audio stream. */ typedef struct PDMAUDIOSTREAM { /** List node. */ RTLISTNODE Node; /** Name of this stream. */ char szName[64]; /** Number of references to this stream. Only can be * destroyed if the reference count is reaching 0. */ uint32_t cRefs; /** Stream status flag. */ PDMAUDIOSTREAMSTS fStatus; /** Audio direction of this stream. */ PDMAUDIODIR enmDir; /** The guest side of the stream. */ PDMAUDIOSTREAMCTX Guest; /** The host side of the stream. */ PDMAUDIOSTREAMCTX Host; /** Union for input/output specifics (based on enmDir). */ union { PDMAUDIOSTREAMIN In; PDMAUDIOSTREAMOUT Out; } RT_UNION_NM(u); /** Timestamp (in ns) since last iteration. */ uint64_t tsLastIteratedNs; /** Timestamp (in ns) since last playback / capture. */ uint64_t tsLastPlayedCapturedNs; /** Timestamp (in ns) since last read (input streams) or * write (output streams). */ uint64_t tsLastReadWrittenNs; /** For output streams this indicates whether the stream has reached * its playback threshold, e.g. is playing audio. * For input streams this indicates whether the stream has enough input * data to actually start reading audio. */ bool fThresholdReached; /** Data to backend-specific stream data. * This data block will be casted by the backend to access its backend-dependent data. * * That way the backends do not have access to the audio connector's data. */ void *pvBackend; /** Size (in bytes) of the backend-specific stream data. */ size_t cbBackend; } PDMAUDIOSTREAM; /** Pointer to a audio connector interface. */ typedef struct PDMIAUDIOCONNECTOR *PPDMIAUDIOCONNECTOR; /** * Enumeration for an audio callback source. */ typedef enum PDMAUDIOCBSOURCE { /** Invalid, do not use. */ PDMAUDIOCBSOURCE_INVALID = 0, /** Device emulation. */ PDMAUDIOCBSOURCE_DEVICE = 1, /** Audio connector interface. */ PDMAUDIOCBSOURCE_CONNECTOR = 2, /** Backend (lower). */ PDMAUDIOCBSOURCE_BACKEND = 3, /** Hack to blow the type up to 32-bit. */ PDMAUDIOCBSOURCE_32BIT_HACK = 0x7fffffff } PDMAUDIOCBSOURCE; /** * Audio device callback types. * Those callbacks are being sent from the audio connector -> device emulation. */ typedef enum PDMAUDIODEVICECBTYPE { /** Invalid, do not use. */ PDMAUDIODEVICECBTYPE_INVALID = 0, /** Data is availabe as input for passing to the device emulation. */ PDMAUDIODEVICECBTYPE_DATA_INPUT, /** Free data for the device emulation to write to the backend. */ PDMAUDIODEVICECBTYPE_DATA_OUTPUT, /** Hack to blow the type up to 32-bit. */ PDMAUDIODEVICECBTYPE_32BIT_HACK = 0x7fffffff } PDMAUDIODEVICECBTYPE; /** * Device callback data for audio input. */ typedef struct PDMAUDIODEVICECBDATA_DATA_INPUT { /** Input: How many bytes are availabe as input for passing * to the device emulation. */ uint32_t cbInAvail; /** Output: How many bytes have been read. */ uint32_t cbOutRead; } PDMAUDIODEVICECBDATA_DATA_INPUT, *PPDMAUDIODEVICECBDATA_DATA_INPUT; /** * Device callback data for audio output. */ typedef struct PDMAUDIODEVICECBDATA_DATA_OUTPUT { /** Input: How many bytes are free for the device emulation to write. */ uint32_t cbInFree; /** Output: How many bytes were written by the device emulation. */ uint32_t cbOutWritten; } PDMAUDIODEVICECBDATA_DATA_OUTPUT, *PPDMAUDIODEVICECBDATA_DATA_OUTPUT; /** * Audio backend callback types. * Those callbacks are being sent from the backend -> audio connector. */ typedef enum PDMAUDIOBACKENDCBTYPE { /** Invalid, do not use. */ PDMAUDIOBACKENDCBTYPE_INVALID = 0, /** The backend's status has changed. */ PDMAUDIOBACKENDCBTYPE_STATUS, /** One or more host audio devices have changed. */ PDMAUDIOBACKENDCBTYPE_DEVICES_CHANGED, /** Hack to blow the type up to 32-bit. */ PDMAUDIOBACKENDCBTYPE_32BIT_HACK = 0x7fffffff } PDMAUDIOBACKENDCBTYPE; /** Pointer to a host audio interface. */ typedef struct PDMIHOSTAUDIO *PPDMIHOSTAUDIO; /** * Host audio callback function. * This function will be called from a backend to communicate with the host audio interface. * * @returns IPRT status code. * @param pDrvIns Pointer to driver instance which called us. * @param enmType Callback type. * @param pvUser User argument. * @param cbUser Size (in bytes) of user argument. */ typedef DECLCALLBACK(int) FNPDMHOSTAUDIOCALLBACK(PPDMDRVINS pDrvIns, PDMAUDIOBACKENDCBTYPE enmType, void *pvUser, size_t cbUser); /** Pointer to a FNPDMHOSTAUDIOCALLBACK(). */ typedef FNPDMHOSTAUDIOCALLBACK *PFNPDMHOSTAUDIOCALLBACK; /** * Audio callback registration record. */ typedef struct PDMAUDIOCBRECORD { /** List node. */ RTLISTANCHOR Node; /** Callback source. */ PDMAUDIOCBSOURCE enmSource; /** Callback type, based on the given source. */ union { /** Device callback stuff. */ struct { PDMAUDIODEVICECBTYPE enmType; } Device; } RT_UNION_NM(u); /** Pointer to context data. Optional. */ void *pvCtx; /** Size (in bytes) of context data. * Must be 0 if pvCtx is NULL. */ size_t cbCtx; } PDMAUDIOCBRECORD, *PPDMAUDIOCBRECORD; #define PPDMAUDIOBACKENDSTREAM void * /** * Audio connector interface (up). */ typedef struct PDMIAUDIOCONNECTOR { /** * Enables or disables the given audio direction for this driver. * * When disabled, assiociated output streams consume written audio without passing them further down to the backends. * Associated input streams then return silence when read from those. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param enmDir Audio direction to enable or disable driver for. * @param fEnable Whether to enable or disable the specified audio direction. */ DECLR3CALLBACKMEMBER(int, pfnEnable, (PPDMIAUDIOCONNECTOR pInterface, PDMAUDIODIR enmDir, bool fEnable)); /** * Returns whether the given audio direction for this driver is enabled or not. * * @returns True if audio is enabled for the given direction, false if not. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param enmDir Audio direction to retrieve enabled status for. */ DECLR3CALLBACKMEMBER(bool, pfnIsEnabled, (PPDMIAUDIOCONNECTOR pInterface, PDMAUDIODIR enmDir)); /** * Retrieves the current configuration of the host audio backend. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pCfg Where to store the host audio backend configuration data. */ DECLR3CALLBACKMEMBER(int, pfnGetConfig, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOBACKENDCFG pCfg)); /** * Retrieves the current status of the host audio backend. * * @returns Status of the host audio backend. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param enmDir Audio direction to check host audio backend for. Specify PDMAUDIODIR_ANY for the overall * backend status. */ DECLR3CALLBACKMEMBER(PDMAUDIOBACKENDSTS, pfnGetStatus, (PPDMIAUDIOCONNECTOR pInterface, PDMAUDIODIR enmDir)); /** * Creates an audio stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pCfgHost Stream configuration for host side. * @param pCfgGuest Stream configuration for guest side. * @param ppStream Pointer where to return the created audio stream on success. */ DECLR3CALLBACKMEMBER(int, pfnStreamCreate, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAMCFG pCfgHost, PPDMAUDIOSTREAMCFG pCfgGuest, PPDMAUDIOSTREAM *ppStream)); /** * Destroys an audio stream. * * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(int, pfnStreamDestroy, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Adds a reference to the specified audio stream. * * @returns New reference count. UINT32_MAX on error. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream adding the reference to. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamRetain, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Releases a reference from the specified stream. * * @returns New reference count. UINT32_MAX on error. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream releasing a reference from. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamRelease, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Reads PCM audio data from the host (input). * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream to write to. * @param pvBuf Where to store the read data. * @param cbBuf Number of bytes to read. * @param pcbRead Bytes of audio data read. Optional. */ DECLR3CALLBACKMEMBER(int, pfnStreamRead, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, void *pvBuf, uint32_t cbBuf, uint32_t *pcbRead)); /** * Writes PCM audio data to the host (output). * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream to read from. * @param pvBuf Audio data to be written. * @param cbBuf Number of bytes to be written. * @param pcbWritten Bytes of audio data written. Optional. */ DECLR3CALLBACKMEMBER(int, pfnStreamWrite, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, const void *pvBuf, uint32_t cbBuf, uint32_t *pcbWritten)); /** * Controls a specific audio stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param enmStreamCmd The stream command to issue. */ DECLR3CALLBACKMEMBER(int, pfnStreamControl, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, PDMAUDIOSTREAMCMD enmStreamCmd)); /** * Processes stream data. * * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(int, pfnStreamIterate, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Returns the number of readable data (in bytes) of a specific audio input stream. * * @returns Number of readable data (in bytes). * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetReadable, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Returns the number of writable data (in bytes) of a specific audio output stream. * * @returns Number of writable data (in bytes). * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetWritable, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Returns the status of a specific audio stream. * * @returns Audio stream status * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(PDMAUDIOSTREAMSTS, pfnStreamGetStatus, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream)); /** * Sets the audio volume of a specific audio stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param pVol Pointer to audio volume structure to set the stream's audio volume to. */ DECLR3CALLBACKMEMBER(int, pfnStreamSetVolume, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, PPDMAUDIOVOLUME pVol)); /** * Plays (transfers) available audio frames to the host backend. Only works with output streams. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param pcFramesPlayed Number of frames played. Optional. */ DECLR3CALLBACKMEMBER(int, pfnStreamPlay, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, uint32_t *pcFramesPlayed)); /** * Captures (transfers) available audio frames from the host backend. Only works with input streams. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param pcFramesCaptured Number of frames captured. Optional. */ DECLR3CALLBACKMEMBER(int, pfnStreamCapture, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOSTREAM pStream, uint32_t *pcFramesCaptured)); /** * Registers (device) callbacks. * This is handy for letting the device emulation know of certain events, e.g. processing input / output data * or configuration changes. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param paCallbacks Pointer to array of callbacks to register. * @param cCallbacks Number of callbacks to register. */ DECLR3CALLBACKMEMBER(int, pfnRegisterCallbacks, (PPDMIAUDIOCONNECTOR pInterface, PPDMAUDIOCBRECORD paCallbacks, size_t cCallbacks)); } PDMIAUDIOCONNECTOR; /** PDMIAUDIOCONNECTOR interface ID. */ #define PDMIAUDIOCONNECTOR_IID "A643B40C-733F-4307-9549-070AF0EE0ED6" /** * Assigns all needed interface callbacks for an audio backend. * * @param a_Prefix The function name prefix. */ #define PDMAUDIO_IHOSTAUDIO_CALLBACKS(a_Prefix) \ do { \ pThis->IHostAudio.pfnInit = RT_CONCAT(a_Prefix,Init); \ pThis->IHostAudio.pfnShutdown = RT_CONCAT(a_Prefix,Shutdown); \ pThis->IHostAudio.pfnGetConfig = RT_CONCAT(a_Prefix,GetConfig); \ /** @todo Add pfnGetDevices here as soon as supported by all backends. */ \ pThis->IHostAudio.pfnGetStatus = RT_CONCAT(a_Prefix,GetStatus); \ /** @todo Ditto for pfnSetCallback. */ \ pThis->IHostAudio.pfnStreamCreate = RT_CONCAT(a_Prefix,StreamCreate); \ pThis->IHostAudio.pfnStreamDestroy = RT_CONCAT(a_Prefix,StreamDestroy); \ pThis->IHostAudio.pfnStreamControl = RT_CONCAT(a_Prefix,StreamControl); \ pThis->IHostAudio.pfnStreamGetReadable = RT_CONCAT(a_Prefix,StreamGetReadable); \ pThis->IHostAudio.pfnStreamGetWritable = RT_CONCAT(a_Prefix,StreamGetWritable); \ pThis->IHostAudio.pfnStreamGetStatus = RT_CONCAT(a_Prefix,StreamGetStatus); \ pThis->IHostAudio.pfnStreamIterate = RT_CONCAT(a_Prefix,StreamIterate); \ pThis->IHostAudio.pfnStreamPlay = RT_CONCAT(a_Prefix,StreamPlay); \ pThis->IHostAudio.pfnStreamCapture = RT_CONCAT(a_Prefix,StreamCapture); \ } while (0) /** * PDM host audio interface. */ typedef struct PDMIHOSTAUDIO { /** * Initializes the host backend (driver). * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. */ DECLR3CALLBACKMEMBER(int, pfnInit, (PPDMIHOSTAUDIO pInterface)); /** * Shuts down the host backend (driver). * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. */ DECLR3CALLBACKMEMBER(void, pfnShutdown, (PPDMIHOSTAUDIO pInterface)); /** * Returns the host backend's configuration (backend). * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pBackendCfg Where to store the backend audio configuration to. */ DECLR3CALLBACKMEMBER(int, pfnGetConfig, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDCFG pBackendCfg)); /** * Returns (enumerates) host audio device information. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pDeviceEnum Where to return the enumerated audio devices. */ DECLR3CALLBACKMEMBER(int, pfnGetDevices, (PPDMIHOSTAUDIO pInterface, PPDMAUDIODEVICEENUM pDeviceEnum)); /** * Returns the current status from the audio backend. * * @returns PDMAUDIOBACKENDSTS enum. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param enmDir Audio direction to get status for. Pass PDMAUDIODIR_ANY for overall status. */ DECLR3CALLBACKMEMBER(PDMAUDIOBACKENDSTS, pfnGetStatus, (PPDMIHOSTAUDIO pInterface, PDMAUDIODIR enmDir)); /** * Sets a callback the audio backend can call. Optional. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pfnCallback The callback function to use, or NULL when unregistering. */ DECLR3CALLBACKMEMBER(int, pfnSetCallback, (PPDMIHOSTAUDIO pInterface, PFNPDMHOSTAUDIOCALLBACK pfnCallback)); /** * Creates an audio stream using the requested stream configuration. * If a backend is not able to create this configuration, it will return its best match in the acquired configuration * structure on success. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param pCfgReq Pointer to requested stream configuration. * @param pCfgAcq Pointer to acquired stream configuration. */ DECLR3CALLBACKMEMBER(int, pfnStreamCreate, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, PPDMAUDIOSTREAMCFG pCfgReq, PPDMAUDIOSTREAMCFG pCfgAcq)); /** * Destroys an audio stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(int, pfnStreamDestroy, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Controls an audio stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param enmStreamCmd The stream command to issue. */ DECLR3CALLBACKMEMBER(int, pfnStreamControl, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, PDMAUDIOSTREAMCMD enmStreamCmd)); /** * Returns the amount which is readable from the audio (input) stream. * * @returns For non-raw layout streams: Number of readable bytes. * for raw layout streams : Number of readable audio frames. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetReadable, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Returns the amount which is writable to the audio (output) stream. * * @returns For non-raw layout streams: Number of writable bytes. * for raw layout streams : Number of writable audio frames. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetWritable, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Returns the amount which is pending (in other words has not yet been processed) by/from the backend yet. * Optional. * * For input streams this is read audio data by the backend which has not been processed by the host yet. * For output streams this is written audio data to the backend which has not been processed by the backend yet. * * @returns For non-raw layout streams: Number of pending bytes. * for raw layout streams : Number of pending audio frames. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(uint32_t, pfnStreamGetPending, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Returns the current status of the given backend stream. * * @returns PDMAUDIOSTREAMSTS * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(PDMAUDIOSTREAMSTS, pfnStreamGetStatus, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Gives the host backend the chance to do some (necessary) iteration work. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(int, pfnStreamIterate, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Signals the backend that the host wants to begin playing for this iteration. Optional. * * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(void, pfnStreamPlayBegin, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Plays (writes to) an audio (output) stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param pvBuf Pointer to audio data buffer to play. * @param cxBuf For non-raw layout streams: Size (in bytes) of audio data buffer, * for raw layout streams : Size (in audio frames) of audio data buffer. * @param pcxWritten For non-raw layout streams: Returns number of bytes written. Optional. * for raw layout streams : Returns number of frames written. Optional. */ DECLR3CALLBACKMEMBER(int, pfnStreamPlay, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, const void *pvBuf, uint32_t cxBuf, uint32_t *pcxWritten)); /** * Signals the backend that the host finished playing for this iteration. Optional. * * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(void, pfnStreamPlayEnd, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Signals the backend that the host wants to begin capturing for this iteration. Optional. * * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(void, pfnStreamCaptureBegin, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); /** * Captures (reads from) an audio (input) stream. * * @returns VBox status code. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. * @param pvBuf Buffer where to store read audio data. * @param cxBuf For non-raw layout streams: Size (in bytes) of audio data buffer, * for raw layout streams : Size (in audio frames) of audio data buffer. * @param pcxRead For non-raw layout streams: Returns number of bytes read. Optional. * for raw layout streams : Returns number of frames read. Optional. */ DECLR3CALLBACKMEMBER(int, pfnStreamCapture, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream, void *pvBuf, uint32_t cxBuf, uint32_t *pcxRead)); /** * Signals the backend that the host finished capturing for this iteration. Optional. * * @param pInterface Pointer to the interface structure containing the called function pointer. * @param pStream Pointer to audio stream. */ DECLR3CALLBACKMEMBER(void, pfnStreamCaptureEnd, (PPDMIHOSTAUDIO pInterface, PPDMAUDIOBACKENDSTREAM pStream)); } PDMIHOSTAUDIO; /** PDMIHOSTAUDIO interface ID. */ #define PDMIHOSTAUDIO_IID "640F5A31-8245-491C-538F-29A0F9D08881" /** @} */ #endif /* !VBOX_INCLUDED_vmm_pdmaudioifs_h */