audio_filters.h

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/*
 * audio_filters.h -- audio filters
 * Copyright (C) 2002 Charles Yates <charles.yates@pandora.be>
 * Copyright (C) 2002-2007 Dan Dennedy <dan@dennedy.org>
 *
 * 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.
 */

#ifndef _AUDIO_FILTERS_H_
#define _AUDIO_FILTERS_H_

// C++ Includes

#include <vector>
using std::vector;

// C Includes

#include <stdint.h>
#include <gtk/gtk.h>

class AudioFilter 
{
    public:
        virtual ~AudioFilter() {}
        virtual char *GetDescription( ) const = 0;
        virtual void GetFrame( int16_t **buffer, int frequency, int channels, int& samples, double position, double frame_delta ) = 0;
        virtual bool IsUsable( ) { return true; }
        virtual bool IsAFrameConsumer( ) const { return true; }
};

class GDKAudioFilter : public AudioFilter
{
    public:
        virtual ~GDKAudioFilter() {}
        virtual void AttachWidgets( GtkBin *bin ) { }
        virtual void InterpretWidgets( GtkBin *bin ) { }
        virtual void DetachWidgets( GtkBin *bin ) { }
};

class GDKAudioFilterAdapter : public GDKAudioFilter
{
    private:
        AudioFilter *filter;

    public:
        GDKAudioFilterAdapter( AudioFilter *filter ) { this->filter = filter; }
        virtual ~GDKAudioFilterAdapter( ) { delete filter; }
        char *GetDescription( ) const { return this->filter->GetDescription( ); }
        void GetFrame( int16_t **buffer, int frequency, int channels, int& samples, double position, double frame_delta ) {
            return this->filter->GetFrame( buffer, frequency, channels, samples, position, frame_delta );
        }
};

class GDKAudioFilterRepository
{
    private:
        vector <GDKAudioFilter *> filters;
        GDKAudioFilter *selected_filter;
        GtkOptionMenu *menu;
        GtkBin *container;
    public:
        GDKAudioFilterRepository();
        ~GDKAudioFilterRepository();
        void Register( GDKAudioFilter *filter );
        void Initialise( GtkOptionMenu *menu, GtkBin *container );
        GDKAudioFilter *Get( ) const;
        void SelectionChange( );
};

#endif

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