IMFTransform::GetInputCurrentType method

Gets the current media type for an input stream on this Media Foundation transform (MFT).

Syntax

HRESULT GetInputCurrentType(
  DWORD        dwInputStreamID,
  IMFMediaType **ppType
);

Parameters

dwInputStreamID

Input stream identifier. To get the list of stream identifiers, call IMFTransform::GetStreamIDs.

ppType

Receives a pointer to the IMFMediaType interface. The caller must release the interface.

Return Value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code Description
S_OK
The method succeeded.
MF_E_INVALIDSTREAMNUMBER
Invalid stream identifier.
MF_E_TRANSFORM_TYPE_NOT_SET
The input media type has not been set.

Remarks

If the specified input stream does not yet have a media type, the method returns MF_E_TRANSFORM_TYPE_NOT_SET. Most MFTs do not set any default media types when first created. Instead, the client must set the media type by calling IMFTransform::SetInputType.

If MFT_UNIQUE_METHOD_NAMES is defined before including mftransform.h, this method is renamed MFTGetInputCurrentType. See Creating Hybrid DMO/MFT Objects.

Implementation Notes

The MFT should return a clone of the media type, not a pointer to the original type. Otherwise, the caller might modify the type and alter the internal state of the MFT.

Requirements

   
Minimum supported client Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header mftransform.h
Library Mfuuid.lib

See Also

IMFTransform

Media Foundation Transforms