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plugin.hh

/*
 * PIAVE - PIAVE Is A Video Editor
 *
 * Copyright (C) 2002 Rolf Dubitzky, rolf@dubitzky.de
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


#if ! defined( PLUGIN_HH )
#define PLUGIN_HH

// STD C++
#include <iostream>
#include <string>

// PIAVE
#include "piave_base.hh"

#define PLUGIN_IFACE_VERSION 1

namespace PIAVE { 

    class PropertyNode;

    class Plugin;
    
    typedef Plugin * (*PluginMaker)();

    struct PluginInfo {
        const char * name;
        int iface_version;
        PluginMaker maker;
    };

#define PIAVE_PLUGIN( N )  \
        Plugin * new_ ## N () { return new  N (); }; \
        PluginInfo pluginInfo[] = { { #N , PLUGIN_IFACE_VERSION , &new_ ##N } , \
                                    { 0  , 0                    , 0 } \
                                  };;

    enum PluginType_e {
        /* meta types for queries */
        PLUGIN_NO_TYPE = 0, 
        PLUGIN_ANY_TYPE, 
        /* effect plugins */
        PLUGIN_VIDEO_OP,
        PLUGIN_AUDIO_OP,
        /* iostreams and container */
        PLUGIN_INSTREAM,
        PLUGIN_OUTSTREAM,
        /* codecs */
        PLUGIN_VIDEO_CODEC,
        PLUGIN_AUDIO_CODEC,
        /* media elements */
        PLUGIN_MEDIA_ELEMENT
    };


    class PluginBase
    {
      public:
        PluginBase() {};
        virtual ~PluginBase() {}
        virtual PropertyNode * getProperties( PropertyNode *p  = 0 ) const = 0;

    };

    class Plugin 
    {
      public:
        Plugin( const std::string & name, PluginType_e t );
        virtual ~Plugin();

        std::string     getName() const { return _name; }
        int             getPriority()const { return _priority; }
        PluginType_e    getType() const { return _type; }
        PropertyNode *  getCapabilities() const;
        bool            isEnabled() const { return _enabled; }

        void setName( const std::string & n ) { _name = n; }
        void setPriority( int p ) { _priority = p; }
        void setCapabilities( PropertyNode * caps ) { _caps = caps; };
        void setEnabled( bool enabled = true ) { _enabled = enabled; }

        virtual PluginBase    * newElement( const PropertyNode * p = 0 ) = 0;
        

      private:
        std::string _name;

        int _priority; 

        PluginType_e _type;

        PropertyNode * _caps; 

        bool _enabled;

    };

}

#endif

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