cachobj.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#ifndef _HXFIFOCACHE_
#define _HXFIFOCACHE_

#include "hxcache.h"

class CChunkyRes;

struct ChunkyCacheLayout
{
    UINT16  size;   
    GUID    guid;
};
    
class HXFIFOCache : public IHXFIFOCache
{
private:
    LONG32		m_lRefCount;
    CChunkyRes*		m_pChunkyRes;
    UINT32		m_ulCurrentReadPosition;
    UINT32		m_ulCurrentWritePosition;
public:
    HXFIFOCache();
    ~HXFIFOCache();

    /*
     * IUnknown methods
     */
    STDMETHOD(QueryInterface)	(THIS_
				REFIID riid,
				void** ppvObj);

    STDMETHOD_(ULONG32,AddRef)	(THIS);

    STDMETHOD_(ULONG32,Release)	(THIS);

    /*
     * IHXFIFOCache methods
     */

    /************************************************************************
     *	Method:
     *		IHXFIFOCache::Cache
     *	Purpose:
     *	    To cache objects in a temporary storage for later retrieval
     *
     *	    Currently supported objects:
     *		IHXBuffer
     *		IHXValues
     *		IHXPacket
// $Private:
     *		IHXTimeStampedBuffer
     *		IHXClientPacket
// $EndPrivate.
     *
     */
    STDMETHOD(Cache)	(THIS_
			 IUnknown*	    pObject);

    /************************************************************************
     *	Method:
     *	    IHXFIFOCache::Retrieve
     *	Purpose:
     *
     *
     */
    STDMETHOD(Retrieve)	    (THIS_
			    REF(IUnknown*)  pObject);

    /************************************************************************
     *	Method:
     *	    IHXFIFOCache::Flush
     *	Purpose:
     *
     *
     */
    STDMETHOD(Flush)	    (THIS);

private:
    HX_RESULT CacheClientPacket(IHXClientPacket* pClientPacket);
    HX_RESULT CacheTimestampBuffer(IHXTimeStampedBuffer* pTimeStampBuffer);
    HX_RESULT CacheBuffer(IHXBuffer* pBuffer);
    HX_RESULT CachePacket(IHXPacket* pPacket);
    HX_RESULT CacheValues(IHXValues* pValues);   
};

#endif /*_HXFIFOCACHE_*/