Implementing the DMO Methods

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Windows Embedded CE 6.0 R3

4/8/2010

The IMediaObjectImpltemplate provides partial implementations for the following IMediaObjectmethods.

The derived class must provide a corresponding method, which the IMediaObjectmethod calls internally. The internal methods have the prefix Internal- to the method name. The internal methods use the same parameters as the interface methods.

IMediaObject method	Derived class method
IMediaObject::AllocateStreamingResources	InternalAllocateStreamingResources
IMediaObject::Discontinuity	InternalDiscontinuity
IMediaObject::Flush	InternalFlush
IMediaObject::FreeStreamingResources	InternalFreeStreamingResources
IMediaObject::GetInputMaxLatency	InternalGetInputMaxLatency
IMediaObject::GetInputSizeInfo	InternalGetInputSizeInfo
IMediaObject::GetInputStreamInfo	InternalGetInputStreamInfo
IMediaObject::GetInputType	InternalGetInputType
IMediaObject::GetOutputSizeInfo	InternalGetOutputSizeInfo
IMediaObject::GetOutputStreamInfo	InternalGetOutputStreamInfo
IMediaObject::GetOutputType	InternalGetOutputType
IMediaObject::ProcessInput	InternalProcessInput
IMediaObject::ProcessOutput	InternalProcessOutput
IMediaObject::SetInputMaxLatency	InternalSetInputMaxLatency

For the remaining IMediaObjectmethods, there is not a one-to-one correspondence between interface methods and internal methods.

The following table summarizes which methods are fully implemented by the template and which methods call helper methods from the derived class.

IMediaObject method	IMediaObjectImpl implementation
IMediaObject::GetInputCurrentType	Fully implemented.
IMediaObject::GetOutputCurrentType	Fully implemented.
IMediaObject::GetStreamCount	Fully implemented.
IMediaObject::GetInputStatus	Calls InternalAcceptingInput.
IMediaObject::Lock	Implemented as DMOLock. Calls Lockor Unlock.
IMediaObject::SetInputType	Calls InternalCheckInputType.
IMediaObject::SetOutputType	Calls InternalCheckOutputType.

See Also

Reference