MFPKEY_EXATTRIBUTE_SUPPORTED property

Specifies whether a Media Foundation transform (MFT) copies attributes from input samples to output samples.

Data type

PROPVARIANT type (vt)

PROPVARIANT member

VARIANT_BOOL

VT_BOOL

boolVal

Remarks

This attribute can have the following values.

To get this attribute, call QueryInterface on the MFT for the IPropertyStore interface.

The default value is VARIANT_FALSE. If the MFT does not expose the IPropertyStore interface, or if this property is not set, treat the value as VARIANT_FALSE.

This property is read-only.

Examples

The following example returns VARIANT_TRUE if an MFT copies sample attributes.

BOOL TransformCopiesSampleAttributes(IMFTransform *pMFT)
{
    BOOL bCopiesAttributes = FALSE;

    IPropertyStore *pProps = NULL;

    HRESULT hr = pMFT->QueryInterface(IID_PPV_ARGS(&pProps));
    
    if (SUCCEEDED(hr))
    {
        PROPVARIANT var;
        hr = pProps->GetValue(MFPKEY_EXATTRIBUTE_SUPPORTED, &var);

        if (SUCCEEDED(hr))
        {
            bCopiesAttributes = 
                (var.vt == VT_BOOL && var.boolVal == VARIANT_TRUE);

            PropVariantClear(&var);
        }
        pProps->Release();
    }
    return bCopiesAttributes;
}

Requirements

See also

Media Foundation Properties

Sample Attributes

IMFTransform::ProcessOutput