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DMORegister function

Applies to: desktop apps only

The DMORegister function registers a DMO.

Syntax

Copy

HRESULT DMORegister(
  LPCWSTR szName,
  REFCLSID clsidDMO,
  REFGUID guidCategory,
  DWORD dwFlags,
  DWORD cInTypes,
  const DMO_PARTIAL_MEDIATYPE *pInTypes,
  DWORD cOutTypes,
  const DMO_PARTIAL_MEDIATYPE *pOutTypes
);

Parameters

szName: NULL-terminated string that contains a descriptive name for the DMO. Names longer than 79 characters might be truncated.
clsidDMO: Class identifier (CLSID) of the DMO.
guidCategory: GUID that specifies the category of the DMO. See DMO GUIDs for a list of category GUIDs.
dwFlags: Bitwise combination of zero or more flags from the DMO_REGISTER_FLAGS enumeration.
cInTypes: Number of input media types to register. Can be zero.
pInTypes: Pointer to an array of DMO_PARTIAL_MEDIATYPE structures that specify the input media types. The size of the array is specified in the cInTypes parameter
cOutTypes: Number of output media types to register.
pOutTypes: Pointer to an array of DMO_PARTIAL_MEDIATYPE structures that specify the output media types. The size of the array is specified in the cOutTypes parameter. Can be zero.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
E_FAIL	Failure
E_INVALIDARG	Invalid argument
S_OK	Success

Remarks

This function adds information about a DMO to the registry. Applications or software components can use this information to locate the DMOs they need to use, by calling the DMOEnum function. For example, to encode a video stream, you would search in the DMOCATEGORY_VIDEO_ENCODER category for a DMO whose media types matched your requirements.

The media types registered by this function are only for the purpose of finding the DMO. They do not necessarily match the types returned by the IMediaObject::GetInputType and IMediaObject::GetOutputType methods. For example, a decoder might register just its main input types. After the DMO is created and its input type has been set, its GetOutputType method will return all of the decompressed types it can generate.

Requirements