IMFDeviceTransform::GetInputStreamState method (mftransform.h)

The GetInputStreamState method gets the Device MFT’s input stream state.

Syntax

HRESULT GetInputStreamState(
  [in]  DWORD             dwStreamID,
  [out] DeviceStreamState *value
);

[in] dwStreamID

Stream ID of the input stream whose state needs to be retrieved.

[out] value

Specifies the current DeviceStreamState of the specified input Device MFT stream.

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

Return code	Description
S_OK	Transitioning the stream state succeeded.
MF_E_INVALIDREQUEST	Device MFT could not support the request at this time.
MF_E_INVAILIDSTREAMNUMBER	An invalid stream ID was passed.

This method is used by device transform manager (DTM) to get a specific input stream’s state.