CEnumMediaTypes class

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The CEnumMediaTypes class implements an enumerator for preferred media types.

This class implements the IEnumMediaTypes interface. It calls the following CBasePin methods:

• CBasePin::GetMediaType:Retrieves a media type, referenced by a zero-based index.
• CBasePin::GetMediaTypeVersion: Determines whether the set of preferred types has changed.

Whenever a pin alters its list of preferred media types, the pin increments the media-type version number. When this happens, the enumerator object is no longer synchronized with the pin, and the class methods return VFW_E_ENUM_OUT_OF_SYNC. Call the CEnumMediaTypes::Reset method to resynchronize the enumerator.

Public Methods	Description
CEnumMediaTypes	Constructor method.
~CEnumMediaTypes	Destructor method. Virtual.
IEnumMediaTypes Methods	Description
Clone	Makes a copy of the enumerator with the same enumeration state.
Next	Retrieves a specified number of media types.
Reset	Resets the enumeration sequence to the beginning.
Skip	Skips over a specified number of media types.

Requirements

Requirement	Value
Header	Amfilter.h (include Streams.h)
Library	Strmbase.lib (retail builds); Strmbasd.lib (debug builds)