cachobj.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: cachobj.cpp,v 1.7.20.3 2004/07/09 01:48:15 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (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.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * 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 ***** */

/****************************************************************************
 * 
 *  cachobj.cpp
 *
 *  Purpose:
 *	To cache objects in a temporary storage for later retrieval
 *	Can be created off of IHXCommonClassFactory.
 *	Currently supported only on the client side.
 *
 */

#include "hxcom.h"
#include "hxtypes.h"
#include "hxresult.h"
#include "hxguid.h"
#include "timeval.h"
#include "basepkt.h"
#include "hxbuffer.h"
#include "timebuff.h"
#include "hxcache.h"
#include "ihxpckts.h"
#include "hxtbuf.h"
#include "chunkres.h"
#include "cachobj.h"

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif

// HXFIFOCache...
HXFIFOCache::HXFIFOCache() :
      m_lRefCount(0)
    , m_pChunkyRes(NULL)
    , m_ulCurrentReadPosition(0)
    , m_ulCurrentWritePosition(0)
{
}

HXFIFOCache::~HXFIFOCache()
{
    Flush();
}

/*
 * IUnknown methods
 */



/////////////////////////////////////////////////////////////////////////
//	Method:
//		IUnknown::QueryInterface
//	Purpose:
//		Implement this to export the interfaces supported by your 
//		object.
//
STDMETHODIMP HXFIFOCache::QueryInterface(REFIID riid, void** ppvObj)
{
	QInterfaceList qiList[] =
	{
		{ GET_IIDHANDLE(IID_IUnknown), this },
		{ GET_IIDHANDLE(IID_IHXFIFOCache), (IHXFIFOCache*) this },
	};	
    return QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);   
}

/////////////////////////////////////////////////////////////////////////
//	Method:
//		IUnknown::AddRef
//	Purpose:
//		Everyone usually implements this the same... feel free to use
//		this implementation.
//
STDMETHODIMP_(ULONG32) HXFIFOCache::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//	Method:
//		IUnknown::Release
//	Purpose:
//		Everyone usually implements this the same... feel free to use
//		this implementation.
//
STDMETHODIMP_(ULONG32) HXFIFOCache::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
	return m_lRefCount;
    }

    delete this;
    return 0;
}

/************************************************************************
 *	Method:
 *		IHXFIFOCache::Cache
 *	Purpose:
 *	    To cache objects in a temporary storage for later retrieval
 *
 *	    Currently supported objects:
 *		IHXBuffer
 *		IHXValues
 *		IHXPacket
// $Private:
 *		IHXTimeStampedBuffer
// $EndPrivate.
 *
 */
STDMETHODIMP HXFIFOCache::Cache(IUnknown*	    pObject)
{
    HX_RESULT		    theErr = HXR_UNEXPECTED;
    IHXClientPacket*	    pClientPacket = NULL;
    IHXTimeStampedBuffer*  pTimeStampBuffer = NULL;
    IHXBuffer*		    pBuffer = NULL;
    IHXPacket*		    pPacket = NULL;
    IHXValues*		    pValues = NULL;

    if (!m_pChunkyRes)
    {
	m_pChunkyRes = new CChunkyRes;
    }

    if (pObject->QueryInterface(IID_IHXClientPacket, (void**) &pClientPacket) == HXR_OK)
    {
	theErr = CacheClientPacket(pClientPacket);
	pClientPacket->Release();
    }
    else if (pObject->QueryInterface(IID_IHXTimeStampedBuffer, (void**) &pTimeStampBuffer) == HXR_OK)
    {
	theErr = CacheTimestampBuffer(pTimeStampBuffer);
	pTimeStampBuffer->Release();
    }
    else if (pObject->QueryInterface(IID_IHXBuffer, (void**) &pBuffer) == HXR_OK)
    {
	theErr = CacheBuffer(pBuffer);
	pBuffer->Release();
    }
    else if (pObject->QueryInterface(IID_IHXPacket, (void**) &pPacket) == HXR_OK)
    {
	theErr = CachePacket(pPacket);
	pPacket->Release();
    }
    else if (pObject->QueryInterface(IID_IHXValues, (void**) &pValues) == HXR_OK)
    {
	theErr = CacheValues(pValues);
	pValues->Release();
    }

    return theErr;
}

/************************************************************************
 *	Method:
 *	    IHXFIFOCache::Retrieve
 *	Purpose:
 *
 *
 */
STDMETHODIMP HXFIFOCache::Retrieve(REF(IUnknown*)  pObject)
{
    HX_RESULT		theErr = HXR_OK;
    UINT32		ulBytesRead = 0;
    UINT32		ulBytesToRead = 0;
    char*		pData = NULL;
    char*		pCursor = NULL;
    CHXBuffer*		pBuffer = NULL;
    ChunkyCacheLayout*	pChunkyCacheLayout = NULL;

    if (!m_pChunkyRes)
    {
	theErr = HXR_UNEXPECTED;
	goto cleanup;
    }

    pObject = NULL;
    
    pChunkyCacheLayout = new ChunkyCacheLayout;
    ulBytesToRead = sizeof(ChunkyCacheLayout);

    // read Chunk Header Info
    m_pChunkyRes->GetData(m_ulCurrentReadPosition,
			  (char*)pChunkyCacheLayout,
			  ulBytesToRead,
			  &ulBytesRead);
    m_ulCurrentReadPosition += ulBytesRead;

    if (ulBytesRead)
    {
	HX_ASSERT(ulBytesToRead == ulBytesRead);	

	ulBytesToRead = pChunkyCacheLayout->size - ulBytesRead;
	pData = new char[ulBytesToRead];
	
	// read the Chunk Data
	m_pChunkyRes->GetData(m_ulCurrentReadPosition,
			      (char*)pData,
			      ulBytesToRead,
			      &ulBytesRead);
	HX_ASSERT(ulBytesToRead == ulBytesRead);
	m_ulCurrentReadPosition += ulBytesRead;

	pCursor = pData;
	if (::IsEqualGUID(IID_IHXClientPacket, pChunkyCacheLayout->guid)) 
	{	    	    
	    ClientPacket::UnPack((IHXClientPacket*&)pObject, pCursor, ulBytesRead);
	}
	else if (::IsEqualGUID(IID_IHXPacket, pChunkyCacheLayout->guid))
	{
	    CHXPacket::UnPack((IHXPacket*&)pObject, pCursor, ulBytesRead);
	}
	else if (::IsEqualGUID(IID_IHXTimeStampedBuffer, pChunkyCacheLayout->guid))
	{
	    CHXTimeStampedBuffer::UnPack((IHXTimeStampedBuffer*&)pObject, pCursor, ulBytesRead);
	}
	else if (::IsEqualGUID(IID_IHXBuffer, pChunkyCacheLayout->guid))
	{
	    pBuffer = new CHXBuffer();
	    pBuffer->Set((const UCHAR*)pCursor, ulBytesRead);

	    pBuffer->QueryInterface(IID_IHXBuffer, (void**)&pObject);
	}
	else
	{
	    theErr = HXR_NOTIMPL;
	}
    }

cleanup:

    HX_DELETE(pChunkyCacheLayout);
    HX_VECTOR_DELETE(pData);
    
    return theErr;
}

/************************************************************************
 *	Method:
 *	    IHXFIFOCache::Flush
 *	Purpose:
 *
 *
 */
STDMETHODIMP HXFIFOCache::Flush(void)
{
    m_ulCurrentReadPosition	= 0;
    m_ulCurrentWritePosition	= 0;

    HX_DELETE(m_pChunkyRes);