DMORegisterFilter

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

This function calls DMORegister and then creates additional entries in the registry that allow filter enumeration routines in DirectShow to locate a DMO.

Syntax

STDAPI DMORegisterFilter(
  LPCWSTR                      szName,
  REFCLSID                     clsidDMO,
  REFGUID                      guidCategory,
  REFCLSID                     clsidAutoWrap,
  DWORD                        dwFlags,
  unsigned long                ulInTypes,
  const DMO_PARTIAL_MEDIATYPE* pInTypes,
  unsigned long                ulOutTypes,
  const DMO_PARTIAL_MEDIATYPE* pOutTypes
);

Parameters

• szName
  [in] Null-terminated string that contains a descriptive name for the DMO. Names longer than 79 characters might be truncated.

• clsidDMO
  [in] Class identifier (CLSID) of the DMO.

• guidCategory
  [in] One of the DMO GUIDs. It specifies the category of the DMO.

• clsidAutoWrap
  [in] The class identifier that specifies the DirectShow filter that will contain the DMO.

• dwFlags
  [in] Bitwise combination of zero or more flags from the DMO_REGISTER_FLAGS enumeration.

• ulInTypes
  [in] Number of input media types to register, which can be zero.

• pInTypes
  [in] Pointer to an array of DMO_PARTIAL_MEDIATYPE structures that specify the input media types. The size of the array is specified in the ulInTypes parameter.

• ulOutTypes
  [in] 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 ulOutTypes parameter, which can be zero.

Return Value

Returns an HRESULT value. Possible values include the following.

Remarks

This function adds information about a filter DMO to the registry. Applications or Component Object Model (COM) components can use this information to locate the DMOs they need 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 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 is set, its GetOutputType method returns all of the decompressed types it can generate.

Requirements

See Also

Reference

DMO Functions
IMediaObject::GetInputType
IMediaObject::GetOutputType
DMOEnum
DMO_REGISTER_FLAGS
DMO_PARTIAL_MEDIATYPE
DMO GUIDs
DMOUnregisterFilter