minwave.cpp

windows下面的声卡驱动程序windows下面的声卡驱动程序

    if (NT_SUCCESS(ntStatus))
    {
        if (Capture)
        {
            m_fCaptureAllocated = TRUE;
        }
        else
        {
            m_fRenderAllocated = TRUE;
        }

        *OutStream = PMINIPORTWAVECYCLICSTREAM(stream);
        (*OutStream)->AddRef();
        
        *OutDmaChannel = PDMACHANNEL(stream);
        (*OutDmaChannel)->AddRef();

        *OutServiceGroup = m_ServiceGroup;
        (*OutServiceGroup)->AddRef();

        // The stream, the DMA channel, and the service group have
        // references now for the caller.  The caller expects these
        // references to be there.
    }

    // This is our private reference to the stream.  The caller has
    // its own, so we can release in any case.
    //
    if (stream)
    {
        stream->Release();
    }
    
    return ntStatus;
} // NewStream

//=============================================================================
STDMETHODIMP_(NTSTATUS)
CMiniportWaveCyclic::NonDelegatingQueryInterface
( 
    IN  REFIID  Interface,
    OUT PVOID * Object 
)
/*++

Routine Description:

  QueryInterface

Arguments:

  Interface - GUID

  Object - interface pointer to be returned.

Return Value:

  NT status code.

--*/
{
    PAGED_CODE();

    ASSERT(Object);

    if (IsEqualGUIDAligned(Interface, IID_IUnknown))
    {
        *Object = PVOID(PUNKNOWN(PMINIPORTWAVECYCLIC(this)));
    }
    else if (IsEqualGUIDAligned(Interface, IID_IMiniport))
    {
        *Object = PVOID(PMINIPORT(this));
    }
    else if (IsEqualGUIDAligned(Interface, IID_IMiniportWaveCyclic))
    {
        *Object = PVOID(PMINIPORTWAVECYCLIC(this));
    }
    else
    {
        *Object = NULL;
    }

    if (*Object)
    {
        // We reference the interface for the caller.

        PUNKNOWN(*Object)->AddRef();
        return STATUS_SUCCESS;
    }

    return STATUS_INVALID_PARAMETER;
} // NonDelegatingQueryInterface

//=============================================================================
NTSTATUS
CMiniportWaveCyclic::PropertyHandlerComponentId
(
    IN PPCPROPERTY_REQUEST      PropertyRequest
)
/*++

Routine Description:

  Handles KSPROPERTY_GENERAL_COMPONENTID

Arguments:

  PropertyRequest - 

Return Value:

  NT status code.

--*/
{
    PAGED_CODE();

    DPF_ENTER(("[PropertyHandlerComponentId]"));

    NTSTATUS                    ntStatus = STATUS_INVALID_DEVICE_REQUEST;

    if (PropertyRequest->Verb & KSPROPERTY_TYPE_BASICSUPPORT)
    {
        ntStatus = 
            PropertyHandler_BasicSupport
            (
                PropertyRequest,
                KSPROPERTY_TYPE_BASICSUPPORT | KSPROPERTY_TYPE_GET,
                VT_ILLEGAL
            );
    }
    else
    {
        ntStatus = 
            ValidatePropertyParams
            (
                PropertyRequest, 
                sizeof(KSCOMPONENTID), 
                0
            );
        if (NT_SUCCESS(ntStatus))
        {
            if (PropertyRequest->Verb & KSPROPERTY_TYPE_GET)
            {
                PKSCOMPONENTID pComponentId = (PKSCOMPONENTID)
                    PropertyRequest->Value;

                INIT_MMREG_MID(&pComponentId->Manufacturer, MM_MICROSOFT);
                pComponentId->Product   = PID_MSVAD;
                pComponentId->Name      = NAME_MSVAD_SIMPLE;
                pComponentId->Component = GUID_NULL; // Not used for extended caps.
                pComponentId->Version   = MSVAD_VERSION;
                pComponentId->Revision  = MSVAD_REVISION;

                PropertyRequest->ValueSize = sizeof(KSCOMPONENTID);
                ntStatus = STATUS_SUCCESS;
            }
        }
        else
        {
            DPF(D_TERSE, ("[PropertyHandlerComponentId - Invalid parameter]"));
            ntStatus = STATUS_INVALID_PARAMETER;
        }
    }

    return ntStatus;
} // PropertyHandlerComponentId

//=============================================================================
NTSTATUS
PropertyHandler_WaveFilter
( 
    IN PPCPROPERTY_REQUEST      PropertyRequest 
)
/*++

Routine Description:

  Redirects general property request to miniport object

Arguments:

  PropertyRequest - 

Return Value:

  NT status code.

--*/
{
    PAGED_CODE();

    NTSTATUS                    ntStatus = STATUS_INVALID_DEVICE_REQUEST;
    PCMiniportWaveCyclic        pWave = 
        (PCMiniportWaveCyclic) PropertyRequest->MajorTarget;

    switch (PropertyRequest->PropertyItem->Id)
    {
        case KSPROPERTY_GENERAL_COMPONENTID:
            ntStatus = 
                pWave->PropertyHandlerComponentId
                (
                    PropertyRequest
                );
            break;
        
        default:
            DPF(D_TERSE, ("[PropertyHandler_WaveFilter: Invalid Device Request]"));
    }

    return ntStatus;
} // PropertyHandler_WaveFilter

//=============================================================================
// CMiniportWaveStreamCyclicSimple
//=============================================================================

//=============================================================================
CMiniportWaveCyclicStream::~CMiniportWaveCyclicStream
( 
    void 
)
/*++

Routine Description:

  Destructor for wavecyclicstream 

Arguments:

Return Value:

  NT status code.

--*/
{
    PAGED_CODE();

    DPF_ENTER(("[CMiniportWaveCyclicStream::~CMiniportWaveCyclicStream]"));

    if (NULL != m_pMiniportLocal)
    {
        if (m_fCapture)
        {
            m_pMiniportLocal->m_fCaptureAllocated = FALSE;
        }
        else
        {
            m_pMiniportLocal->m_fRenderAllocated = FALSE;
        }
    }
} // ~CMiniportWaveCyclicStream

//=============================================================================
NTSTATUS
CMiniportWaveCyclicStream::Init
( 
    IN PCMiniportWaveCyclic         Miniport_,
    IN ULONG                        Pin_,
    IN BOOLEAN                      Capture_,
    IN PKSDATAFORMAT                DataFormat_
)
/*++

Routine Description:

  Initializes the stream object. Allocate a DMA buffer, timer and DPC

Arguments:

  Miniport_ -

  Pin_ -

  Capture_ -

  DataFormat -

  DmaChannel_ -

Return Value:

  NT status code.

--*/
{
    PAGED_CODE();

    m_pMiniportLocal = Miniport_;

    return 
        CMiniportWaveCyclicStreamMSVAD::Init
        (
            Miniport_,
            Pin_,
            Capture_,
            DataFormat_
        );
} // Init

//=============================================================================
STDMETHODIMP_(NTSTATUS)
CMiniportWaveCyclicStream::NonDelegatingQueryInterface
( 
    IN  REFIID  Interface,
    OUT PVOID * Object 
)
/*++

Routine Description:

  QueryInterface

Arguments:

  Interface - GUID

  Object - interface pointer to be returned

Return Value:

  NT status code.

--*/
{
    PAGED_CODE();

    ASSERT(Object);

    if (IsEqualGUIDAligned(Interface, IID_IUnknown))
    {
        *Object = PVOID(PUNKNOWN(PMINIPORTWAVECYCLICSTREAM(this)));
    }
    else if (IsEqualGUIDAligned(Interface, IID_IMiniportWaveCyclicStream))
    {
        *Object = PVOID(PMINIPORTWAVECYCLICSTREAM(this));
    }
    else if (IsEqualGUIDAligned(Interface, IID_IDmaChannel))
    {
        *Object = PVOID(PDMACHANNEL(this));
    }
    else
    {
        *Object = NULL;
    }

    if (*Object)
    {
        PUNKNOWN(*Object)->AddRef();
        return STATUS_SUCCESS;
    }

    return STATUS_INVALID_PARAMETER;
} // NonDelegatingQueryInterface
#pragma code_seg()