Microsoft DirectX 9.0


The CheckMediaType method determines if the pin accepts a specific media type.


HRESULT CheckMediaType(
    const CMediaType *pmt



Pointer to a CMediaType object that contains the proposed media type.

Return Value

Returns an HRESULT value. Possible values include those shown in the following table.

Value Description
S_OK Success.
VFW_E_TYPE_NOT_ACCEPTED Media type not accepted.


This method overrides the CTransformOutputPin::CheckMediaType method.

If the filter is already streaming and is using two allocators, this method rejects any format changes. Otherwise, this method calls the filter's CTransformFilter::CheckInputType method to check the media type. If the input pin is connected, it also calls the IPin::QueryAccept method on the upstream output pin.

See Also