CBasePin.EnumMediaTypes method

The EnumMediaTypes method enumerates the pin's preferred media types. This method implements the IPin::EnumMediaTypes method.

Syntax


HRESULT EnumMediaTypes(
  IEnumMediaTypes **ppEnum
);

Parameters

ppEnum

Address of a variable that receives a pointer to the IEnumMediaTypes interface.

Return value

Returns an HRESULT value. Possible values include those in the following table.

Return codeDescription
S_OK

Success.

E_OUTOFMEMORY

Insufficient memory.

E_POINTER

NULL pointer argument.

 

Remarks

Input pins are not required to enumerate any preferred types. Output pins must enumerate at least one preferred type. Otherwise, both pins could lack a preferred type, making a connection impossible.

The IEnumMediaTypes interface works like a standard COM enumerator. For more information, see Enumerating Objects in a Filter Graph. If the method succeeds, the IEnumMediaTypes interface has an outstanding reference count. Be sure to release it when you are done.

The CEnumMediaTypes base class implements IEnumMediaTypes. It calls the pin's CBasePin::GetMediaType method to enumerate the media types.

Requirements

Header

Amfilter.h (include Streams.h)

Library

Strmbase.lib (retail builds);
Strmbasd.lib (debug builds)

See also

CBasePin Class

 

 

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