plghand2.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: plghand2.h,v 1.5.36.1 2004/07/09 02:07:18 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 ***** */

#ifndef _PLGNHAND_H_
#define _PLGNHAND_H_

#include "hxslist.h"
#include "hxplugn.h"
#include "hxstring.h"
#include "hxguidmap.h"
#include "hxprefs.h"
#include "hxengin.h"
#include "hxcomm.h" 
#include "hxerror.h"
#include "hxphand.h"

#include "dbindex.h"

#include "unkimp.h"

typedef HX_RESULT (HXEXPORT_PTR FPCREATEINSTANCE) (IUnknown** /*OUT*/ ppIUnknown);
typedef HX_RESULT (HXEXPORT_PTR FPSHUTDOWN) ();
typedef HX_RESULT (HXEXPORT_PTR FPCANUNLOAD2) ();

typedef ULONG32	    (STDMETHODCALLTYPE *FPWatchRef)(void*);
typedef HX_RESULT   (STDMETHODCALLTYPE *FPQueryInterfaceWatch)(void*, REFIID riid,void** ppvObj);

// This is the new and improved plugin handler. 
// What is better in this version 
//  (1)	Unified Plugins No longer do you have to modify code in seven places when a bug 
//	appears. Simply modify the Plugin Class. It is the heart of the plugin Handler.
//  (2)	The plugin handler now has rudimentary ref counting of the DLLs which it loads.
//	This means that we cannot (almost) safely shutdown the player. Further, we can
//	ALMOST unload DLLs when they are not required anymore. 

class Plugin2Handler;
class DLLAccess;
class CPluginEnumerator;
class CPluginInfoWriter;

// you want GUIDS? WE have GUIDS!
DEFINE_GUID(IID_IHXPluginWatcherResponse, 0x00000C08, 0x901, 0x11d1, 0x8b, 0x6, 0x0, 
			0xa0, 0x24, 0x40, 0x6d, 0x59);

DECLARE_INTERFACE_(IHXPluginWatcherResponse, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)	(THIS_
				REFIID riid,
				void** ppvObj) PURE;

    STDMETHOD_(ULONG32,AddRef)	(THIS) PURE;

    STDMETHOD_(ULONG32,Release)	(THIS) PURE;

    /************************************************************************
     *	Method:
     *	    IHXPluginWatcherResponse::AllObjectsDeleted
     *	Purpose:
     *	    This function will be called all objects of the given class are
     *	    destroyed. 
     */
    STDMETHOD(AllObjectsDeleted)		(THIS_ void*) PURE;
};

class Plugin2Handler :	public CUnknownIMP,
			public IHXPluginEnumerator, 
			public IHXPluginReloader,
			public IHXPlugin2Handler,
			public IHXPlugin2HandlerEnumeratorInterface,
		    	public IHXPluginHandler3,
		    	public IHXPluginDatabase,
		    	public IHXCallback
{
    // forward declarations?
    // see note below   class PluginMonitor;	    

    class PreferenceEnumerator;
    class PluginMountPoint;
    class PluginDLL;
    class Plugin;
    class OtherDLL;
    class PluginSupportingGUID;
    
    friend class CPluginEnumerator;
    friend class PreferenceEnumerator;
    friend class PluginDLL;
    friend class Plugin;
    friend class PluginSupportingGUID;
    friend class OtherDLL;

public:
    enum    Errors
    {
	NO_ERRORS = 0,
	PLUGIN_NOT_FOUND,
	MEMORY_ERROR,
	CANT_OPEN_DLL,
	BAD_DLL,
	CREATE_INSTANCHXR_FAILURE,
	CANT_DETERMINE_PLUGIN_DIR,
	CANT_OPEN_PLUGIN_DIR,
	BAD_PLUGIN,
	INVALID_CONTEXT,
	CANT_GET_FILE_FORMAT_INFO,
	CANT_GET_RENDERER_INFO,
	CANT_GET_FILE_SYSTEM_INFO,
	CANT_LOAD_INTERFACE,
	SHORT_NAME_NOT_FOUND,
	PLUGIN_ALREADY_HAS_MOUNT_POINT,
	INVALID_SHORT_NAME,
	BAD_REGISTRY_HANDLE,
	PLUGIN_DIR_NOT_SAME,
	REQUIRED_PLUGIN_NOT_LOADED,
	NO_HX_CREATE_INSTANCE,
	AGGREGATION_NOT_SUPPORTED
    };

    enum eValueTypes
    {
	eString,
	eBuffer,
	eInt
    };


    DECLARE_UNKNOWN_NOCREATE( Plugin2Handler )
    DECLARE_COM_CREATE_FUNCS( Plugin2Handler )

    Plugin2Handler();
    ~Plugin2Handler();

    /*
     *	IHXCallback methods
     */
    STDMETHOD ( Func ) ( THIS );

    /*
     *	IHXPluginEnumerator methods
     */

    /************************************************************************
     *	Method:
     *	    IHXPluginEnumerator::GetNumOfPlugins
     *
     *	Purpose:    
     *	    return the number of plugins available
     *
     */
    STDMETHOD_(ULONG32,GetNumOfPlugins)	(THIS);

    /************************************************************************
     *	Method:
     *	    IHXPluginEnumerator::GetPlugin
     *	Purpose:
     *	    return an instance(IUnknown) of the plugin
     *
     */
    STDMETHOD(GetPlugin)   (THIS_
			    ULONG32	    /*IN*/  ulIndex,
			    REF(IUnknown*)  /*OUT*/ pPlugin);

    /*
     *	IHXPluginReloader methods
     */

    /************************************************************************
     *	Method:
     *	    IHXPluginReloader::ReloadPlugins
     *
     *	Purpose:    
     *	    reloads plugins 
     *
     */
    STDMETHOD(ReloadPlugins)	(THIS);


    /*
     *	IHXPlugin2Handler
     */

     /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::Init
     *
     *	Purpose:    
     *	    Specifies the context and sets the Plugin2Handler in motion.
     *
     */
    STDMETHOD(Init)    (THIS_ IUnknown* pContext);

    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::GetNumPlugins2
     *
     *	Purpose:    
     *	    Gets the info of a particular plugin.
     *
     */
    STDMETHOD_(ULONG32,GetNumOfPlugins2)    (THIS);
    
    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::GetPluginInfo
     *
     *	Purpose:    
     *	    Gets the info of a particular plugin.
     *
     */

    STDMETHOD(GetPluginInfo)	(THIS_ 
				UINT32 unIndex, 
				REF(IHXValues*) /*OUT*/ Values) ;

    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::FlushCache()
     *
     *	Purpose:    
     *	    Flushes the LRU cache -- Unloads all DLLs from memory 
     *	    which currenltly have a refcount of 0.
     */

    STDMETHOD(FlushCache)	(THIS);

    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::SetCacheSize
     *
     *	Purpose:    
     *	    This function sets the size of the Cache. The cache is 
     *	    initally set to 1000KB. To disable the cache simply set
     *		the size to 0.If the cache is disabled a DLL will be 
     *	    unloaded whenever it's refcount becomes zero. Which MAY
     *		cause performance problems.
     */

    STDMETHOD(SetCacheSize)	(THIS_ ULONG32 nSizeKB);

    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::ReadFromRegistry
     *
     *	Purpose:    
     *	    Reload the DLL information from the registery. It will also 
     *	    Check to see if this information is valid, and if 
     */
    STDMETHOD(ReadFromRegistry)(THIS);

    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::GetInstance
     *
     *	Purpose:    
     *	    
     *	    This function will return a plugin instance given a plugin index.
     *		
     */
    
    STDMETHOD(GetInstance) (THIS_ UINT32 index, REF(IUnknown*) ppUnknown); 
    
    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::FindReturnIndexUsingValues
     *
     *	Purpose:    
     *	    Finds a plugin  which matches the set of values given. An index
     *	    is returned which can be used to either get the values (using 
     *	    GetPluginInfo) or an instance can be created using GetPluing(). 	
     * 
     */

    STDMETHOD(FindIndexUsingValues)		    (THIS_ IHXValues*, 
						    REF(UINT32) unIndex);

    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::FindReturnPluginUsingValues
     *
     *	Purpose:    
     *	    Finds a plugin  which matches the set of values given. A Plugin
     *	    instance is returned. 
     *	    
     */

    STDMETHOD(FindPluginUsingValues)		    (THIS_ IHXValues*, 
						    REF(IUnknown*) pUnk);
    
    /************************************************************************
     *	Method:
     *	    IHXPlugin2Handler::FindReturnIndexUsingStrings
     *
     *	Purpose:    
     *	    Finds a plugin  which matches the set of values given. An index
     *	    is returned which can be used to either get the values (using 
     *	    GetPluginInfo) or an instance can be created using GetPluing(). 	
     *	    NOTE: that a max of two values may be given.
     */
    STDMETHOD(FindIndexUsingStrings)		    (THIS_ char* PropName1, 
						    char* PropVal1, 
						    char* PropName2,