/** 
 * @file media_plugin_base.h
 * @brief Media plugin base class for LLMedia API plugin system
 *
 * @cond
 * $LicenseInfo:firstyear=2008&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 * @endcond
 */

#include "linden_common.h"

#include "llplugininstance.h"
#include "llpluginmessage.h"
#include "llpluginmessageclasses.h"


class MediaPluginBase
{
public:
	MediaPluginBase(LLPluginInstance::sendMessageFunction host_send_func, void *host_user_data);
   /** Media plugin destructor. */
	virtual ~MediaPluginBase() {}

   /** Handle received message from plugin loader shell. */
	virtual void receiveMessage(const char *message_string) = 0;
	
	static void staticReceiveMessage(const char *message_string, void **user_data);

protected:

   /** Plugin status. */
	typedef enum 
	{
		STATUS_NONE,
		STATUS_LOADING,
		STATUS_LOADED,
		STATUS_ERROR,
		STATUS_PLAYING,
		STATUS_PAUSED,
		STATUS_DONE
	} EStatus;

   /** Plugin shared memory. */
	class SharedSegmentInfo
	{
	public:
      /** Shared memory address. */
		void *mAddress;
      /** Shared memory size. */
		size_t mSize;
	};

	void sendMessage(const LLPluginMessage &message);
	void sendStatus();
	std::string statusString();
	void setStatus(EStatus status);		
	
	/// Note: The quicktime plugin overrides this to add current time and duration to the message.
	virtual void setDirty(int left, int top, int right, int bottom);

   /** Map of shared memory names to shared memory. */
	typedef std::map<std::string, SharedSegmentInfo> SharedSegmentMap;

	
   /** Function to send message from plugin to plugin loader shell. */
	LLPluginInstance::sendMessageFunction mHostSendFunction;
   /** Message data being sent to plugin loader shell by mHostSendFunction. */
	void *mHostUserData;
   /** Flag to delete plugin instance (self). */
	bool mDeleteMe;
   /** Pixel array to display. TODO:DOC are pixels always 24-bit RGB format, aligned on 32-bit boundary? Also: calling this a pixel array may be misleading since 1 pixel > 1 char. */
	unsigned char* mPixels;
   /** TODO:DOC what's this for -- does a texture have its own piece of shared memory? updated on size_change_request, cleared on shm_remove */
	std::string mTextureSegmentName;
   /** Width of plugin display in pixels. */
	int mWidth;
   /** Height of plugin display in pixels. */
	int mHeight;
   /** Width of plugin texture. */
	int mTextureWidth;
   /** Height of plugin texture. */
	int mTextureHeight;
   /** Pixel depth (pixel size in bytes). */
	int mDepth;
   /** Current status of plugin. */
	EStatus mStatus;
   /** Map of shared memory segments. */
	SharedSegmentMap mSharedSegments;

};

/** The plugin <b>must</b> define this function to create its instance.
 * It should look something like this: 
 * @code
 * {  
 *    MediaPluginFoo *self = new MediaPluginFoo(host_send_func, host_user_data); 
 *    *plugin_send_func = MediaPluginFoo::staticReceiveMessage; 
 *    *plugin_user_data = (void*)self; 
 *    
 *    return 0; 
 * }  
 * @endcode
 */
int init_media_plugin(
	LLPluginInstance::sendMessageFunction host_send_func, 
	void *host_user_data, 
	LLPluginInstance::sendMessageFunction *plugin_send_func, 
	void **plugin_user_data);


