MF_SA_D3D_ALLOCATE_DISPLAYABLE_RESOURCES 属性

指定 MFT 的示例分配器 (SA) 是否应使用 D3D11_RESOURCE_MISC_SHARED_DISPLAYABLE 标志分配基础 Direct3D 纹理。

数据类型

UINT32

备注

此属性Windows 10版本 20348 提供。

注意

D3D11_RESOURCE_MISC_FLAG枚举的 D3D11_RESOURCE_MISC_SHARED_DISPLAYABLE 成员字段将在 SDK 的未来版本中提供。

媒体基础平台层在呈现视频时设置 MF_SA_D3D11_ALLOCATE_DISPLAYABLE_RESOURCES 属性。 如果应用想要实现自己的视频呈现器并使用 D3D11 可显示资源，则也可以选择设置此属性。

示例

下面的代码示例演示 了 MF_SA_D3D11_ALLOCATE_DISPLAYABLE_RESOURCES 属性的用法。

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 = {}; 

}; 

要求

要求	值
最低受支持的客户端	Windows 10内部版本 20348
标头	Mftransform.h

另请参阅

媒体基础属性的字母顺序列表

IMFAttributes：：GetUINT32

IMFAttributes：：SetUINT32

媒体基础属性