MF_SA_D3D_ALLOCATE_DISPLAYABLE_RESOURCES attribute

Specifies if the MFT’s Sample Allocator (SA) should allocate the underlying Direct3D Texture using the D3D11_RESOURCE_MISC_SHARED_DISPLAYABLE flag.

Data type

UINT32

Remarks

This attribute is available staring with Windows 10 build 20348.

The Media Foundation platform layer sets the MF_SA_D3D11_ALLOCATE_DISPLAYABLE_RESOURCES attribute when rendering video. An app could also opt to set this attribute if it wants to implement its own video renderer and make use of D3D11 Displayable Resources.

Example

The following code example demonstrates the usage of the MF_SA_D3D11_ALLOCATE_DISPLAYABLE_RESOURCES attribute.

class DecoderMFT : public IMFAttributes, public IMFTransform 
{ 
    //  
    ... Other implementation details omitted 
    // 

public: 
    // Implementation of IMFAttributes::GetAttributes which is invoked by the MF Topology Loader 
    STDMETHODIMP GetAttribtues(IMFAttributes** attributes) 
    { 
        m_attributes.copyTo(attributes); 
        return S_OK; 
    } 

 

private: 
    // Private method to be called before DecoderMFT initializes its sample pool. 
    // A good place for this to happen is in the method which processes the  
    // 'MFT_MESSAGE_NOTIFY_BEGIN_STREAMING' event. 
    // At a minimum, this processing would be in DecoderMFT's implementation of IMFTransform::ProcessMessage.  

    HRESULT ConfigureTextureFlags() 
    { 
        UINT32 allocateDisplayables = MFGetAttributeUINT32(m_attributes.get(), 
            MF_SA_D3D11_ALLOCATE_DISPLAYABLE_RESOURCES, 0); 

        // If no MF_SA_* attributes which correspond to D3D misc flags are set then it is valid for 
        // miscFlags to be set to 0. 
        m_textureDesc.miscFlags = 0; 
        UINT32 sharedResources = 0; 

        if (allocateDisplayables != 0) 
        { 
            m_textureDesc.miscFlags |= D3D11_RESOURCE_MISC_DISPLAYABLE; 
            // The following flag is required for the decoders output to 
            // use D3D11_RESOURCE_MISC_DISPLAYABLE. 
            m_textureDesc.miscFlags |= D3D11_RESOURCE_MISC_EXCLUSIVE_WRITER; 

            // The following flags are required for the presentation API 
            // to consume and present these resources (also known as direct presentation). 
            m_textureDesc.miscFlags |= D3D11_RESOURCE_MISC_SHARED; 
            m_textureDesc.miscFlags |= D3D11_RESOURCE_MISC_SHARED_NTHANDLE; 

            sharedResources = 1; 
        } 
        else  
        { 
            // This handles the case when MF_SA_D3D11_ALLOCATE_DISPLAYABLE_RESOURCES was 0 or missing. 
            sharedResources = MFGetAttributeUINT32(m_attributes.get(), MF_SA_D3D11_SHARED_WITHOUT_MUTEX, 0); 

            if (sharedResources != 0) 
            { 
                m_textureDesc.miscFlags |= D3D11_RESOURCE_MISC_SHARED; 
            } 
            else 
            { 
                UINT32 sharedKeyMutex = MFGetAttributeUINT32(m_attributes.get(), MF_SA_D3D11_SHARED, 0); 

                if (sharedKeyMutex != 0) 
                { 
                    m_textureDesc.micsFlags |= D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX; 
                } 
            } 
        } 

        // Processing for other MF_SA_* attributes which imply D3D11_RESOURCE_MISC flag 
        // omitted from this sample. 

        return S_OK; 

    } 

    // Private method showing how DecoderMFT can create a texture with the flags required 
    // to satisfy "MF_SA_D3D11_ALLOCATE_DISPLAYBLE_RESOURCES".  
    // Because this is a private function we know the passed in pointer is always valid. 
    // This would be invoked by another private DecoderMFT function when allocating an MFSample 
    // for its sample pool. 

    HRESULT AllocateTextureForSample(ID3D11Texture2D** texture2D) 
    { 
        return m_d3dDevice->CreateTexture2D(&m_textureDesc, nullptr, texture2D); 
    } 

    // ... other members omitted 
    wil::com_ptr_nothrow<IMFAttributes> m_attributes; 
    wil::com_ptr_nothrow<ID3D11Device> m_d3dDevice; 

    // This a texture description for D3D11 resources. 
    D3D11_TEXTURE_2D_DESC m_textureDesc = {}; 

}; 

Requirements

See also

Alphabetical List of Media Foundation Attributes

IMFAttributes::GetUINT32

IMFAttributes::SetUINT32

Media Foundation Attributes