windows-xp/Source/XPSP1/NT/multimedia/dshow/streams/ddstream/mtenum.h

// Copyright (c) 1997  Microsoft Corporation.  All Rights Reserved.

#ifndef __MTENUM_H_INC__
#define __MTENUM_H_INC__

class ATL_NO_VTABLE CMediaTypeEnum : 
	public CComObjectRootEx<CComMultiThreadModel>,
	public IEnumMediaTypes
{
public:
        // 
        // METHODS
        //
        CMediaTypeEnum();
        ~CMediaTypeEnum();

        DECLARE_GET_CONTROLLING_UNKNOWN()

        void Initialize(CStream *pStream, ULONG cCurPos);

        //
        // IEnumMediaTypes
        //
        STDMETHODIMP Next(ULONG cNumToFetch, AM_MEDIA_TYPE **ppMediaTypes, ULONG *pcFetched);
        STDMETHODIMP Skip(ULONG cSkip);
        STDMETHODIMP Reset();
        STDMETHODIMP Clone(IEnumMediaTypes **ppEnumMediaTypes);

BEGIN_COM_MAP(CMediaTypeEnum)
        COM_INTERFACE_ENTRY(IEnumMediaTypes)
END_COM_MAP()

public:
        ULONG           m_cCurrentPos;
        CStream         *m_pStream;
};

#endif