DWORD           dwMaxHw3DAllBuffers;
    DWORD           dwMaxHw3DStaticBuffers;
    DWORD           dwMaxHw3DStreamingBuffers;
    DWORD           dwFreeHw3DAllBuffers;
    DWORD           dwFreeHw3DStaticBuffers;
    DWORD           dwFreeHw3DStreamingBuffers;
    DWORD           dwTotalHwMemBytes;
    DWORD           dwFreeHwMemBytes;
    DWORD           dwMaxContigFreeHwMemBytes;
    DWORD           dwUnlockTransferRateHwBuffers;
    DWORD           dwPlayCpuOverheadSwBuffers;
    DWORD           dwReserved1;
    DWORD           dwReserved2;
} DSCAPS, *LPDSCAPS;

typedef const DSCAPS *LPCDSCAPS;

typedef struct _DSBCAPS
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwBufferBytes;
    DWORD           dwUnlockTransferRate;
    DWORD           dwPlayCpuOverhead;
} DSBCAPS, *LPDSBCAPS;

typedef const DSBCAPS *LPCDSBCAPS;

#if DIRECTSOUND_VERSION >= 0x0800

    typedef struct _DSEFFECTDESC
    {
        DWORD       dwSize;
        DWORD       dwFlags;
        GUID        guidDSFXClass;
        DWORD_PTR   dwReserved1;
        DWORD_PTR   dwReserved2;
    } DSEFFECTDESC, *LPDSEFFECTDESC;
    typedef const DSEFFECTDESC *LPCDSEFFECTDESC;

    #define DSFX_LOCHARDWARE    0x00000001
    #define DSFX_LOCSOFTWARE    0x00000002

    enum
    {
        DSFXR_PRESENT,          // 0
        DSFXR_LOCHARDWARE,      // 1
        DSFXR_LOCSOFTWARE,      // 2
        DSFXR_UNALLOCATED,      // 3
        DSFXR_FAILED,           // 4
        DSFXR_UNKNOWN,          // 5
        DSFXR_SENDLOOP          // 6
    };

    typedef struct _DSCEFFECTDESC
    {
        DWORD       dwSize;
        DWORD       dwFlags;
        GUID        guidDSCFXClass;
        GUID        guidDSCFXInstance;
        DWORD       dwReserved1;
        DWORD       dwReserved2;
    } DSCEFFECTDESC, *LPDSCEFFECTDESC;
    typedef const DSCEFFECTDESC *LPCDSCEFFECTDESC;

    #define DSCFX_LOCHARDWARE   0x00000001
    #define DSCFX_LOCSOFTWARE   0x00000002

    #define DSCFXR_LOCHARDWARE  0x00000010
    #define DSCFXR_LOCSOFTWARE  0x00000020

#endif // DIRECTSOUND_VERSION >= 0x0800

typedef struct _DSBUFFERDESC
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwBufferBytes;
    DWORD           dwReserved;
    LPWAVEFORMATEX  lpwfxFormat;
#if DIRECTSOUND_VERSION >= 0x0700
    GUID            guid3DAlgorithm;
#endif
} DSBUFFERDESC, *LPDSBUFFERDESC;

typedef const DSBUFFERDESC *LPCDSBUFFERDESC;

// Older version of this structure:

typedef struct _DSBUFFERDESC1
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwBufferBytes;
    DWORD           dwReserved;
    LPWAVEFORMATEX  lpwfxFormat;
} DSBUFFERDESC1, *LPDSBUFFERDESC1;

typedef const DSBUFFERDESC1 *LPCDSBUFFERDESC1;

typedef struct _DS3DBUFFER
{
    DWORD           dwSize;
    D3DVECTOR       vPosition;
    D3DVECTOR       vVelocity;
    DWORD           dwInsideConeAngle;
    DWORD           dwOutsideConeAngle;
    D3DVECTOR       vConeOrientation;
    LONG            lConeOutsideVolume;
    D3DVALUE        flMinDistance;
    D3DVALUE        flMaxDistance;
    DWORD           dwMode;
} DS3DBUFFER, *LPDS3DBUFFER;

typedef const DS3DBUFFER *LPCDS3DBUFFER;

typedef struct _DS3DLISTENER
{
    DWORD           dwSize;
    D3DVECTOR       vPosition;
    D3DVECTOR       vVelocity;
    D3DVECTOR       vOrientFront;
    D3DVECTOR       vOrientTop;
    D3DVALUE        flDistanceFactor;
    D3DVALUE        flRolloffFactor;
    D3DVALUE        flDopplerFactor;
} DS3DLISTENER, *LPDS3DLISTENER;

typedef const DS3DLISTENER *LPCDS3DLISTENER;

typedef struct _DSCCAPS
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwFormats;
    DWORD           dwChannels;
} DSCCAPS, *LPDSCCAPS;

typedef const DSCCAPS *LPCDSCCAPS;

typedef struct _DSCBUFFERDESC1
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwBufferBytes;
    DWORD           dwReserved;
    LPWAVEFORMATEX  lpwfxFormat;
} DSCBUFFERDESC1, *LPDSCBUFFERDESC1;

typedef struct _DSCBUFFERDESC
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwBufferBytes;
    DWORD           dwReserved;
    LPWAVEFORMATEX  lpwfxFormat;
#if DIRECTSOUND_VERSION >= 0x0800
    DWORD           dwFXCount;
    LPDSCEFFECTDESC lpDSCFXDesc;
#endif
} DSCBUFFERDESC, *LPDSCBUFFERDESC;

typedef const DSCBUFFERDESC *LPCDSCBUFFERDESC;

typedef struct _DSCBCAPS
{
    DWORD           dwSize;
    DWORD           dwFlags;
    DWORD           dwBufferBytes;
    DWORD           dwReserved;
} DSCBCAPS, *LPDSCBCAPS;

typedef const DSCBCAPS *LPCDSCBCAPS;

typedef struct _DSBPOSITIONNOTIFY
{
    DWORD           dwOffset;
    HANDLE          hEventNotify;
} DSBPOSITIONNOTIFY, *LPDSBPOSITIONNOTIFY;

typedef const DSBPOSITIONNOTIFY *LPCDSBPOSITIONNOTIFY;

//
// DirectSound API
//

typedef BOOL (CALLBACK *LPDSENUMCALLBACKA)(LPGUID, LPCSTR, LPCSTR, LPVOID);
typedef BOOL (CALLBACK *LPDSENUMCALLBACKW)(LPGUID, LPCWSTR, LPCWSTR, LPVOID);

extern HRESULT WINAPI DirectSoundCreate(LPCGUID pcGuidDevice, LPDIRECTSOUND *ppDS, LPUNKNOWN pUnkOuter);
extern HRESULT WINAPI DirectSoundEnumerateA(LPDSENUMCALLBACKA pDSEnumCallback, LPVOID pContext);
extern HRESULT WINAPI DirectSoundEnumerateW(LPDSENUMCALLBACKW pDSEnumCallback, LPVOID pContext);

extern HRESULT WINAPI DirectSoundCaptureCreate(LPCGUID pcGuidDevice, LPDIRECTSOUNDCAPTURE *ppDSC, LPUNKNOWN pUnkOuter);
extern HRESULT WINAPI DirectSoundCaptureEnumerateA(LPDSENUMCALLBACKA pDSEnumCallback, LPVOID pContext);
extern HRESULT WINAPI DirectSoundCaptureEnumerateW(LPDSENUMCALLBACKW pDSEnumCallback, LPVOID pContext);

#if DIRECTSOUND_VERSION >= 0x0800
extern HRESULT WINAPI DirectSoundCreate8(LPCGUID pcGuidDevice, LPDIRECTSOUND8 *ppDS8, LPUNKNOWN pUnkOuter);
extern HRESULT WINAPI DirectSoundCaptureCreate8(LPCGUID pcGuidDevice, LPDIRECTSOUNDCAPTURE8 *ppDSC8, LPUNKNOWN pUnkOuter);
extern HRESULT WINAPI DirectSoundFullDuplexCreate(LPCGUID pcGuidCaptureDevice, LPCGUID pcGuidRenderDevice,
        LPCDSCBUFFERDESC pcDSCBufferDesc, LPCDSBUFFERDESC pcDSBufferDesc, HWND hWnd,
        DWORD dwLevel, LPDIRECTSOUNDFULLDUPLEX* ppDSFD, LPDIRECTSOUNDCAPTUREBUFFER8 *ppDSCBuffer8,
        LPDIRECTSOUNDBUFFER8 *ppDSBuffer8, LPUNKNOWN pUnkOuter);
#define DirectSoundFullDuplexCreate8 DirectSoundFullDuplexCreate

extern HRESULT WINAPI GetDeviceID(LPCGUID pGuidSrc, LPGUID pGuidDest);
#endif // DIRECTSOUND_VERSION >= 0x0800

#ifdef UNICODE
#define LPDSENUMCALLBACK            LPDSENUMCALLBACKW
#define DirectSoundEnumerate        DirectSoundEnumerateW
#define DirectSoundCaptureEnumerate DirectSoundCaptureEnumerateW
#else // UNICODE
#define LPDSENUMCALLBACK            LPDSENUMCALLBACKA
#define DirectSoundEnumerate        DirectSoundEnumerateA
#define DirectSoundCaptureEnumerate DirectSoundCaptureEnumerateA
#endif // UNICODE

//
// IUnknown
//

#if !defined(__cplusplus) || defined(CINTERFACE)
#ifndef IUnknown_QueryInterface
#define IUnknown_QueryInterface(p,a,b)  (p)->lpVtbl->QueryInterface(p,a,b)
#endif // IUnknown_QueryInterface
#ifndef IUnknown_AddRef
#define IUnknown_AddRef(p)              (p)->lpVtbl->AddRef(p)
#endif // IUnknown_AddRef
#ifndef IUnknown_Release
#define IUnknown_Release(p)             (p)->lpVtbl->Release(p)
#endif // IUnknown_Release
#else // !defined(__cplusplus) || defined(CINTERFACE)
#ifndef IUnknown_QueryInterface
#define IUnknown_QueryInterface(p,a,b)  (p)->QueryInterface(a,b)
#endif // IUnknown_QueryInterface
#ifndef IUnknown_AddRef
#define IUnknown_AddRef(p)              (p)->AddRef()
#endif // IUnknown_AddRef
#ifndef IUnknown_Release
#define IUnknown_Release(p)             (p)->Release()
#endif // IUnknown_Release
#endif // !defined(__cplusplus) || defined(CINTERFACE)

#ifndef __IReferenceClock_INTERFACE_DEFINED__
#define __IReferenceClock_INTERFACE_DEFINED__

typedef LONGLONG REFERENCE_TIME;
typedef REFERENCE_TIME *LPREFERENCE_TIME;

DEFINE_GUID(IID_IReferenceClock, 0x56a86897, 0x0ad4, 0x11ce, 0xb0, 0x3a, 0x00, 0x20, 0xaf, 0x0b, 0xa7, 0x70);

#undef INTERFACE
#define INTERFACE IReferenceClock

DECLARE_INTERFACE_(IReferenceClock, IUnknown)
{
    // IUnknown methods
    STDMETHOD(QueryInterface)       (THIS_ REFIID, LPVOID *) PURE;
    STDMETHOD_(ULONG,AddRef)        (THIS) PURE;
    STDMETHOD_(ULONG,Release)       (THIS) PURE;

    // IReferenceClock methods
    STDMETHOD(GetTime)              (THIS_ REFERENCE_TIME *pTime) PURE;
    STDMETHOD(AdviseTime)           (THIS_ REFERENCE_TIME rtBaseTime, REFERENCE_TIME rtStreamTime,
                                           HANDLE hEvent, LPDWORD pdwAdviseCookie) PURE;