Exempelkod (kameraprofil V2)

Följande avsnitt innehåller exempelkod som visar hur de nya API-ytorna kan användas. Varje avsnitt beskriver scenariot för exempelkoden.

Exempel 1

En IHV/OEM-enhet som tillhandahålls av Device MFT måste tillhandahålla en uppsättning kameraprofiler som stöds av den underliggande sensorn och Internetleverantören. Detta publiceras under device MFT:s IMFDeviceTransform::InitializeTransform()-metod.

De angivna kameraprofilerna måste anges i den anslutna transformeringens IMFAttributes-lager (det här är arkivet som pipelinefrågorna när pipelinen är helt konstruerad).

Det här exemplet är typiskt för ett fall där en IHV skickar ett enda referensdrivrutinspaket som aktiverade profiler, men OEM-tillverkare kan välja att koppla ihop kameramodulen med olika sensormoduler. I sådana fall, eftersom sensorerna kanske inte har samma funktioner, krävs en körningsuppdatering av profilerna. Detta görs av DMFT.

IFACEMETHODIMP
SampleDMFT::InitializeTransform(
    _In_ IMFAttributes *pAttributes 
    )
{
    ComPtr<IMFTransform>                spTransform;
    ComPtr<IMFAttributes>               spAttributes;
    ComPtr<IMFSensorProfileCollection>  spProfileCollection;
    ComPtr<IMFSensorProfile>            spProfile;


    if (nullptr == pAttributes)
    {
        return E_INVALIDARG;
    }

    // Get the connected KSCONTROL interface, this is the 
    // IMFTransform of the up stream transform--which will
    // be the devproxy if only one DMFT is present, or
    // will be forwarded by the platform DMFT if that is
    // in between the IHV/OEM DMFT and devproxy.
    // In either case, the IHV/OEM DMFT won't need to know
    // the topology.
    RETURN_IF_FAILED (pAttributes->GetUnknown(MF_DEVICEMFT_CONNECTED_FILTER_KSCONTROL, 
                                              IID_PPV_ARGS(&spTransform)));
    RETURN_IF_FAILED (spTransform->GetAttributes(&spAttributes));

    // Create an empty profile collection...
    RETURN_IF_FAILED (MFCreateSensorProfileCollection(&spProfileCollection));

    // In this example:
    // Pin0 - Preview pin.
    // Pin1 - Capture/Record pin.
    // Pin2 - Photo pin.
    // Pin3 - IR pin.
    // 
    // Legacy profile is mandatory.  This is to ensure non-profile
    // aware applications can still function, but with degraded
    // feature sets.
    RETURN_IF_FAILED (MFCreateSensorProfile(KSCAMERAPROFILE_Legacy, 0, nullptr, 
                                            spProfile.ReleaseAndGetAddressOf()));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(0, L"((RES==;FRT<=30,1;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(1, L"((RES==;FRT<=30,1;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(2, L"((RES==;FRT<=30,1;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(3, L"((RES==;FRT<=30,1;SUT==))"));
    RETURN_IF_FAILED (spProfileCollection->AddProfile(spProfile));

    // High Frame Rate profile will only allow preview & record/capture pin.
    RETURN_IF_FAILED (MFCreateSensorProfile(KSCAMERAPROFILE_HighFrameRate, 0, nullptr, 
                                            spProfile.ReleaseAndGetAddressOf()));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(0, L"((RES==;FRT==;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(1, L"((RES==;FRT>=60,1;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(2, L"(!)"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(3, L"(!)"));
    RETURN_IF_FAILED (spProfileCollection->AddProfile(spProfile));

    // HighQualityPhoto profile will only allow preview and photo pin.
    RETURN_IF_FAILED (MFCreateSensorProfile(KSCAMERAPROFILE_HighQualityPhoto, 0, nullptr, 
                                            spProfile.ReleaseAndGetAddressOf()));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(0, L"((RES==;FRT==;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(1, L"(!)"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(2, L"((RES==;FRT==;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(3, L"(!)"));
    RETURN_IF_FAILED (spProfileCollection->AddProfile(spProfile));

    // Face auth only allows 720p@30fps from preview and any from IR pin.
    RETURN_IF_FAILED (MFCreateSensorProfile(KSCAMERAPROFILE_FaceAuth_Mode, 0, nullptr, 
                                            spProfile.ReleaseAndGetAddressOf()));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(0, L"((RES==1280,720;FRT==30,1;SUT==))"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(1, L"(!)"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(2, L"(!)"));
    RETURN_IF_FAILED (spProfile->AddProfileFilter(3, L"((RES==;FRT==;SUT==))"));
    RETURN_IF_FAILED (spProfileCollection->AddProfile(spProfile));


    // Se the profile collection to the attribute store of the IMFTransform.
    RETURN_IF_FAILED (spAttributes->SetUnknown(MF_DEVICEMFT_SENSORPROFILE_COLLECTION, 
                                               spProfileCollection));

    // ... Rest of the InitializeTransform logic...
}

Exempel 2

I det här scenariot antar vi att IHV/OEM tillhandahöll en Sensor Group Transform (SGT), som syntetiserar medieflödet från flera fysiska enheter. Vi antar också att IHV tillhandahöll en enda referensimplementering för sina kameradrivrutiner för var och en av de fysiska enheterna (eventuellt från olika leverantörer), men OEM-tillverkaren (eller en annan IHV) har valt att koppla ihop kameradrivrutinen med olika sensorer och/eller INTERNETleverantör.

Detta resulterar i att vissa av de funktioner som deklareras av referensimplementeringen inte längre är giltiga. SGT uppdaterar/tar bort profiler som tillhandahålls för att mer exakt beskriva den underliggande maskinvarans funktioner.

Exemplet nedan är implementeringen av IMFSensorTransformFactory::InitializeFactory-metoden. Detta implementeras av en IHV/OEM som producerar drivrutinspaketet för kameraundersystemet.

IFACEMETHODIMP
SampleSensorTransformFactory::InitializeFactory(
    _In_ DWORD dwMaxTransformCount, 
    _In_ IMFCollection* sensorDevices, 
    _In_opt_ IMFAttributes* pAttributes 
    )
{
    DWORD sensorDeviceCount = 0;
    ComPtr<IUnknown> unknown;

    if (nullptr == sensorDevices)
    {
        return E_INVALIDARG;
    }

    // For this example, the IHV/OEM added a SGT to a multi-camera
    // setup.  And the SGT is responsible for updating the profile
    // information available from each of the physical cameras, and
    // leave it's own profile as "blank".  This has the net effect
    // of having the SGT support any profile the physical devices
    // expose.
    RETURN_IF_FAILED (sensorDevices->GetElementCount(&sensorDeviceCount));
    for (DWORD idx = 0; idx < sensorDeviceCount; idx++)
    {
        ComPtr<IMFGetService> service;
        ComPtr<IMFSensorProfileCollection> profileCollection;
        SENSORPROFILEID sensorProfileId;

        RETURN_IF_FAILED (sensorDevices->GetElement(idx, 
                              unknown.ReleaseAndGetAddressOf()));
        RETURN_IF_FAILED (unknown.As(service.ReleaseAndGetAddressOf()));
        RETURN_IF_FAILED (service->GetService(GUID_NULL, 
                              ID_PPV_ARGS(profileCollection.ReleaseAndGetAddressOf())));

        // Let's assume that for this ISP/sensor, we cannot support
        // photo sequence but our reference driver published a single
        // photo sequence profile whose ID is hardcoded to a static
        // variable s_PhotoSequenceProfileId.
        RETURN_IF_FAILED (profileCollection->RemoveProfile(&s_PhotoSequenceProfileId));

        // Let's also assume this is a low cost ISP/sensor so our driver
        // cannot support Video HDR (VHDR) control for high frame rate
        // recording and our reference implementation published multiple
        // high frame rate recording profile.
        // 
        // Also for this combination of ISP/sensor, we cannot support
        // Face Auth (IR doesn't support alternate illumination option).
        // So we need to remove all Face Auth from our collection.
        for (DWORD profileIdx = 0; 
                   profileIdx < profileCollection->GetProfileCount();)
        {
            ComPtr<IMFSensorProfile> profile;

            RETURN_IF_FAILED (profileCollection->GetProfile(profileIdx, 
                                  profile.ReleaseAndGetAddressOf()));

            RETURN_IF_FAILED (profile->GetProfileId(&profileId));
            if (profileId.Type == KSCAMERAPROFILE_HighFrameRate)
            {
                RETURN_IF_FAILED (profile->AddBlockedControl(L"VHDR"));
            }
            if (profileId.Type == KSCAMERAPROFILE_FaceAuth_Mode)
            {
                RETURN_IF_FAILED (profileCollection->RemoveProfileByIndex(profileIdx));
            }
            else
            {
                profileIdx++;
            }
        }
    }

    // ... Rest of the InitializeFactory logic...
}

Exempel 3

Baserat på den valda profilen för en viss enhet avgör du vilken medietyp från enheten som stöds/stöds inte för profilen med hjälp av IMFSensorStream-informationen.

Det här exemplet tillhandahålls för att illustrera hur profilen kan användas på klientutrymmet när du använder Win32 API direkt. WinRT API implementerar redan den här logiken när den används via CameraProfile-API:erna.

HRESULT
CheckMediaTypesOnPin(
    _In_z_ LPCWSTR deviceSymbolicName,
    _In_ UINT32 pinId,
    _In_ SENSORPROFILEID* profileId,
    _COM_Outptr_ IMFCollection** mediaTypeCollection
    )
{
    HRESULT hr = S_OK;
    ComPtr<IMFCollection> collection;
    ComPtr<IMFSensorGroup> sensorGroup;
    ComPtr<IMFGetService> service;
    ComPtr<IMFSensorProfileCollection> profileCollection;
    ComPtr<IMFSensorProfile> profile;
    ComPtr<IMFSensorStream> sensorStream;
    DWORD deviceCount = 0;
    DWORD streamCount = 0;
    DWORD mediaTypeCount = 0;

    // Validate in params.
    if (nullptr == deviceSymbolicName || nullptr == profileId)
    {
        return E_INVALIDARG;
    }
    if (pinId == (UINT32)-1)
    {
        return MF_E_INVALIDSTREAMNUMBER;
    }
    if (nullptr == mediaTypeCollection)
    {
        return E_POINTER;
    }
    *mediaTypeCollection = nullptr;

    RETURN_IF_FAILED (MFCreateCollection(collection.ReleaseAndGetAddressOf()));

    // Create the SensorGroup for our device name.  This device name
    // can be a single physical device name or it can be a multi-device
    // group of devices.  In either case, MFCreateSensorGroup will create
    // a non-activated snapshot of the device(s).
    RETURN_IF_FAILED (MFCreateSensorGroup(deviceSymbolicName, &sensorGroup));
    RETURN_IF_FAILED (sensorGroup.As(service.ReleaseAndGetAddressOf()));

    // Now check if they have a profile collection.
    RETURN_IF_FAILED (service->GetService(GUID_NULL, 
                          IID_PPV_ARGS(profileCollection.ReleaseAndGetAddressOf())));

    if (profileCollection->GetProfileCount() != 0)
    {
        // If they published profiles, but we can't find the specific
        // profile, it means this camera doesn't support that scenario
        // so we should return an empty collection of media types to
        // indicate no support.
        if (FAILED(profileCollection->FindProfile(profileId, 
                       profile.ReleaseAndGetAddressOf())))
        {
            *mediaTypeCollection = collection.Detach();
            return S_OK;
        }
    }

    // If profiles are not supported, then ALL media types are
    // supported.  And we can indicate that by keeping the
    // profile null.  So we have to walk the sensor stream
    // but that means we have to find the sensor stream for
    // the pinId.
    RETURN_IF_FAILED (sensorGroup->GetSensorDeviceCount(&deviceCount));
    for (DWORD deviceIdx = 0; deviceIdx < deviceCount && 
                              sensorStream.Get() == nullptr; deviceIdx++)
    {
        RETURN_IF_FAILED (sensorGroup->GetSensorDevice(deviceIdx, 
                              sensorDevice.ReleaseAndGetAddressOf()));

        RETURN_IF_FAILED (sensorDevice->GetStreamAttributesCount(MFSensorStreamType_Output, 
                              &streamCount));
        
        for (DWORD streamIdx = 0; streamIdx < streamCount; streamIdx++)
        {
            RETURN_IF_FAILED (sensorDevice->GetStreamAttributes(
                                  MFSensorStreamType_Output, 
                                  streamIdx, 
                                  &streamAttributes));

            if (MFGetAttributesUINT32(streamAttributes, 
                                      MF_DEVICESTREAM_STREAM_ID, 
                                      (UINT32) -1) == pinId)
            {
                RETURN_IF_FAILED (streamAttributes.As(sensorStream.ReleaseAndGetAddressOf()));
                break;
            }
        }
    }

    // If we didn't find a sensorStream for the PinId, then we
    // were given bad data....
    if (sensorStream.Get() == nullptr)
    {
        return MF_E_INVALIDSTREAMNUMBER;
    }
    RETURN_IF_FAILED (sensorStream->GetMediaTypeCount(&mediaTypeCount));
    for (DWORD mediaTypeIdx = 0; mediaTypeIdx < mediaTypeCount; mediaTypeIdx++)
    {
        ComPtr<IMFMediaType> mediaType;

        RETURN_IF_FAILED (sensorStream->GetMediaType(mediaTypeIdx, 
                                                     mediaType.ReleaseAndGetAddressOf()));
        if (profile.Get() != nullptr)
        {
            BOOL supported = FALSE;

            RETURN_IF_FAILED (profile->IsMediaTypeSupported(pinId, 
                                                            mediaType.Get(),
                                                             &supported));
            if (supported)
            {
                RETURN_IF_FAILED (collection->AddElement(mediaType.Get()));
            }
        }
        else
        {
            RETURN_IF_FAILED (collection->AddElement(mediaType.Get()));
        }
    }

    *mediaTypeCollection = collection.Detach();

    return S_OK;
}

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