So implementieren Sie erweiterte Kamerasteuerungseigenschaften

Der Kameratreiber sollte erweiterte Kamerasteuerungseigenschaften als einzelne Eigenschaftensätze implementieren, d. h. jede Eigenschaft sollte als einzelner Eigenschaftensatz implementiert werden. Der folgende Beispielcode kann als Ausgangspunkt für die Implementierung dieser Eigenschaften verwendet werden.

Anmerkung Da die Datengröße einer erweiterten Eigenschaft beliebiger Länge sein kann, fragen Sie den Benutzermodusstapel nach der Größe der Daten ab, indem Sie einen NULL-Puffer übergeben. Ein Prozess in zwei Schritten ist erforderlich: Zuerst gibt der Treiber die erforderliche Länge zurück, wie im Beispielcode dargestellt, und der Benutzermodusstapel fordert einen ordnungsgemäßen Puffer für die Eigenschaftendaten an.

Treiberimplementierung

DEFINE_KSPROPERTY_TABLE(SocSimFilterFocusPropertyItems)
{       
    DEFINE_KSPROPERTY_ITEM(
        0,
        CCaptureFilter::FocusRectHandler,
        sizeof(KSPROPERTY),
        0,
        CCaptureFilter::FocusRectHandler,
        NULL, 0, NULL, NULL, 0
        )
};

DEFINE_KSPROPERTY_TABLE(SocSimFilterVideoStabPropertyItems)
{       
    DEFINE_KSPROPERTY_ITEM(
        0,
        CCaptureFilter::VideoStabilizationModeHandler,
        sizeof(KSPROPERTY),
        0,
        CCaptureFilter::VideoStabilizationModeHandler,
        NULL, 0, NULL, NULL, 0
        )
};

DEFINE_KSPROPERTY_TABLE(SocSimFilterFlashPropertyItems)
{       
    DEFINE_KSPROPERTY_ITEM(
        0,
        CCaptureFilter::FlashHandler,
        sizeof(KSPROPERTY),
        0,
        CCaptureFilter::FlashHandler,
        NULL, 0, NULL, NULL, 0
        )
};

DEFINE_KSPROPERTY_SET_TABLE(SocSimFilterPropertySets)
{
    DEFINE_KSPROPERTY_SET(
        &PROPSETID_VIDCAP_CAMERACONTROL_REGION_OF_INTEREST,
        SIZEOF_ARRAY(SocSimFilterFocusPropertyItems),
        SocSimFilterFocusPropertyItems,
        0,
        NULL),

    DEFINE_KSPROPERTY_SET(
        &PROPSETID_VIDCAP_CAMERACONTROL_FLASH,
        SIZEOF_ARRAY(SocSimFilterFlashPropertyItems),
        SocSimFilterFlashPropertyItems,
        0,
        NULL),

    DEFINE_KSPROPERTY_SET(
        &PROPSETID_VIDCAP_CAMERACONTROL_VIDEO_STABILIZATION,
        SIZEOF_ARRAY(SocSimFilterVideoStabPropertyItems),
        SocSimFilterVideoStabPropertyItems,
        0,
        NULL)

};

NTSTATUS
CCaptureFilter::FlashHandler(
    __in    PIRP Irp,
    __in    PKSPROPERTY Property,
    __inout PVOID pData
    )
{
    PAGED_CODE();
    NTSTATUS Status = STATUS_SUCCESS;
    NT_ASSERT(Irp);
    NT_ASSERT(Property);

    CCaptureFilter* pFilter = reinterpret_cast <CCaptureFilter*>(KsGetFilterFromIrp(Irp)->Context);

    PIO_STACK_LOCATION pIrpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ulOutputBufferLength = pIrpStack->Parameters.DeviceIoControl.OutputBufferLength;
    ULONG InputBufferLength = pIrpStack->Parameters.DeviceIoControl.InputBufferLength;

    if (Property->Flags & KSPROPERTY_TYPE_SET)
    {
        if (ulOutputBufferLength == 0)
        {
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S);
            Status = STATUS_BUFFER_OVERFLOW;
        }
        else if (ulOutputBufferLength < sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S))
        {
            Status = STATUS_BUFFER_TOO_SMALL;
        }
        else if (pData && ulOutputBufferLength >= sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S))
        {
            PKSPROPERTY_CAMERACONTROL_FLASH_S pFlash = (PKSPROPERTY_CAMERACONTROL_FLASH_S)pData;
            pFilter->m_Flash = pFlash->Flash;
            pFilter->m_FlashCapabilites = pFlash->Capabilities;
            Status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S);
        }
        else 
        {
            Status = STATUS_INVALID_PARAMETER;
        }
    }
    else if (Property->Flags & KSPROPERTY_TYPE_GET)
    {
        if (ulOutputBufferLength == 0)
        {
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S);
            Status = STATUS_BUFFER_OVERFLOW;
        }
        else if (ulOutputBufferLength < sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S))
        {
            Status = STATUS_BUFFER_TOO_SMALL;
        }
        else if (pData && ulOutputBufferLength >= sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S))
        {
            PKSPROPERTY_CAMERACONTROL_FLASH_S pFlash = (PKSPROPERTY_CAMERACONTROL_FLASH_S)pData;
            pFlash->Flash = pFilter->m_Flash;
            pFlash->Capabilities = pFilter->m_FlashCapabilites;
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_FLASH_S);
            Status = STATUS_SUCCESS;
        }
        else
        {
            Status = STATUS_INVALID_PARAMETER;
        }
    }

    return Status;
}

NTSTATUS
CCaptureFilter::VideoStabilizationModeHandler(
    __in    PIRP Irp,
    __in    PKSPROPERTY Property,
    __inout PVOID pData
    )
{
    PAGED_CODE();
    NTSTATUS Status = STATUS_SUCCESS;
    NT_ASSERT(Irp);
    NT_ASSERT(Property);

    CCaptureFilter* pFilter = reinterpret_cast <CCaptureFilter*>(KsGetFilterFromIrp(Irp)->Context);

    PIO_STACK_LOCATION pIrpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ulOutputBufferLength = pIrpStack->Parameters.DeviceIoControl.OutputBufferLength;
    ULONG InputBufferLength = pIrpStack->Parameters.DeviceIoControl.InputBufferLength;

    if (Property->Flags & KSPROPERTY_TYPE_SET)
    {
        if (ulOutputBufferLength == 0)
        {
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S);
            Status = STATUS_BUFFER_OVERFLOW;
        }
        else if (ulOutputBufferLength < sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S))
        {
            Status = STATUS_BUFFER_TOO_SMALL;
        }
        else if (pData && ulOutputBufferLength >= sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S))
        {
            PKSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S pVideoStab = (PKSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S)pData;
            pFilter->m_VideoStabMode = pVideoStab->VideoStabilizationMode;
            pFilter->m_VideoStabCapabilites = pVideoStab->Capabilities;
            Status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S);
        }
        else 
        {
            Status = STATUS_INVALID_PARAMETER;
        }
    }
    else if (Property->Flags & KSPROPERTY_TYPE_GET)
    {
        if (ulOutputBufferLength == 0)
        {
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S);
            Status = STATUS_BUFFER_OVERFLOW;
        }
        else if (ulOutputBufferLength < sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S))
        {
            Status = STATUS_BUFFER_TOO_SMALL;
        }
        else if (pData && ulOutputBufferLength >= sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S))
        {
            PKSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S pVideoStab = (PKSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S)pData;
            pVideoStab->VideoStabilizationMode = pFilter->m_VideoStabMode;
            pVideoStab->Capabilities = pFilter->m_VideoStabCapabilites;
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_VIDEOSTABILIZATION_MODE_S);
            Status = STATUS_SUCCESS;
        }
        else
        {
            Status = STATUS_INVALID_PARAMETER;
        }
    }

    return Status;
}

NTSTATUS
CCaptureFilter::FocusRectHandler(
    __in    PIRP Irp,
    __in    PKSPROPERTY Property,
    __inout PVOID pData
    )
{
    PAGED_CODE();
    NTSTATUS Status = STATUS_SUCCESS;
    NT_ASSERT(Irp);
    NT_ASSERT(Property);

    CCaptureFilter* pFilter = reinterpret_cast <CCaptureFilter*>(KsGetFilterFromIrp(Irp)->Context);

    PIO_STACK_LOCATION pIrpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG ulOutputBufferLength = pIrpStack->Parameters.DeviceIoControl.OutputBufferLength;
    ULONG InputBufferLength = pIrpStack->Parameters.DeviceIoControl.InputBufferLength;

    if (Property->Flags & KSPROPERTY_TYPE_SET)
    {
        if (ulOutputBufferLength == 0)
        {
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S);
            Status = STATUS_BUFFER_OVERFLOW;
        }
        else if (ulOutputBufferLength < sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S))
        {
            Status = STATUS_BUFFER_TOO_SMALL;
        }
        else if (pData && ulOutputBufferLength >= sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S))
        {
            PKSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S pFocusRect = (PKSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S)pData;
            pFilter->m_FocusRect.left = pFocusRect->FocusRect.left;
            pFilter->m_FocusRect.top = pFocusRect->FocusRect.top;
            pFilter->m_FocusRect.right = pFocusRect->FocusRect.right;
            pFilter->m_FocusRect.bottom = pFocusRect->FocusRect.bottom;
            pFilter->m_AutoFocusLock = pFocusRect->AutoFocusLock;
            pFilter->m_AutoExposureLock = pFocusRect->AutoExposureLock;
            pFilter->m_AutoWhitebalanceLock = pFocusRect->AutoWhitebalanceLock;
            Status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S);
        }
        else 
        {
            Status = STATUS_INVALID_PARAMETER;
        }
    }
    else if (Property->Flags & KSPROPERTY_TYPE_GET)
    {
        if (ulOutputBufferLength == 0)
        {
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S);
            Status = STATUS_BUFFER_OVERFLOW;
        }
        else if (ulOutputBufferLength < sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S))
        {
            Status = STATUS_BUFFER_TOO_SMALL;
        }
        else if (pData && ulOutputBufferLength >= sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S))
        {
            PKSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S pFocusRect = (PKSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S)pData;
            pFocusRect->FocusRect.left = pFilter->m_FocusRect.left;
            pFocusRect->FocusRect.top = pFilter->m_FocusRect.top;
            pFocusRect->FocusRect.right = pFilter->m_FocusRect.right;
            pFocusRect->FocusRect.bottom = pFilter->m_FocusRect.bottom;
            pFocusRect->AutoFocusLock = pFilter->m_AutoFocusLock;
            pFocusRect->AutoExposureLock = pFilter->m_AutoExposureLock;
            pFocusRect->AutoWhitebalanceLock = pFilter->m_AutoWhitebalanceLock;
            Irp->IoStatus.Information = sizeof(KSPROPERTY_CAMERACONTROL_REGION_OF_INTEREST_S);
            Status = STATUS_SUCCESS;
        }
        else
        {
            Status = STATUS_INVALID_PARAMETER;
        }
    }

    return Status;
}