CEnumMediaTypes Class

Microsoft DirectShow 9.0

CEnumMediaTypes Class

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.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

Public Methods
CEnumMediaTypes	Constructor method.
~CEnumMediaTypes	Destructor method. Virtual.
IEnumMediaTypes Methods
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.