WaveGenerator.hxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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 _WAVE_GENERATOR_H
#define _WAVE_GENERATOR_H

#include "Audio.hxx"
#include "Processing.hxx"
#include "AudioOutPort.hxx"
#include "Enum.hxx"

namespace CLAM {

        class EWaveType : public Enum {
        public:
                
                EWaveType() : Enum(ValueTable(), eSine) {}
                EWaveType(tValue v) : Enum(ValueTable(), v) {};
                EWaveType(std::string s) : Enum(ValueTable(), s) {};
                
                typedef enum {
                        eSine
                } tEnum;
                static tEnumValue * ValueTable()
                {
                        static tEnumValue sEnumValues[] = {
                                {EWaveType::eSine,"SineWave"},
                                {0,NULL}
                        };
                        return sEnumValues;
                }

                virtual Component* Species() const
                {
                        return (Component*) new EWaveType(eSine);
                };
        };


        template< typename WaveType > 
        class WaveFunctor {
        public:
                TData operator()(TTime x,TData amplitude);
        };

        class WaveGeneratorConfig: public ProcessingConfig
        {
        public:
                DYNAMIC_TYPE_USING_INTERFACE (WaveGeneratorConfig, 6, ProcessingConfig);
                DYN_ATTRIBUTE (0, public, EWaveType,   WaveType);
                DYN_ATTRIBUTE (1, public, TData,       Frequency);
                DYN_ATTRIBUTE (2, public, TData,       Amplitude);
                DYN_ATTRIBUTE (3, public, TData,       Phase);
                DYN_ATTRIBUTE (4, public, TData,       SampleRate);
                DYN_ATTRIBUTE (5, public, int,         FrameSize);
        protected:
                void DefaultInit(void);
        };

        class WaveGenerator: public Processing
        {
        protected:
                WaveGeneratorConfig mConfig;    
                
        public:
                // MRJ: Convenience type for template thingies to work
                class EWaveType_eSine
                {
                };
        private:

                TData mAmplitude;

                TData mXPos;    // Radians
                TData mXDelta;  // Radians

                EWaveType::tValue mType;

                const char *GetClassName() const {return "WaveGenerator";}

                bool ConcreteConfigure(const ProcessingConfig&);

                inline TData Sine(TTime pos);

        public:


                inline TData GetXPos() const
                {
                        return mXPos;
                }

                inline void SetXPos( TData new_value )
                {
                        mXPos = new_value;
                }

                inline TData GetXDelta() const
                {
                        return mXDelta;
                }

                inline void SetXDelta( TData new_value )
                {
                        mXDelta = new_value;
                }

                inline TData GetAmplitude() const
                {
                        return mAmplitude;
                }

                OutPort<Audio> Output;

                WaveGenerator();

                WaveGenerator(const WaveGeneratorConfig &c);

                virtual ~WaveGenerator();

                const ProcessingConfig &GetConfig() const { return mConfig;}

                bool Do(void);

                bool Do(Audio& in);

        private:

        
        };

        template < typename WaveType >
        void FillBuffer(Array<TData> &buffer, WaveGenerator& generator, WaveType* dummy = 0 )
        {
                TData xvalue = generator.GetXPos(); 
                TData xdelta = generator.GetXDelta();
                TData amplitude = generator.GetAmplitude();


                int i;
                WaveFunctor<WaveType> func;
                int size = buffer.Size();
                for (i=0; i<size; i++) {
                        buffer[i] = func( xvalue, amplitude);
                        xvalue += xdelta;
                }
                if (xvalue > 2.0 * M_PI)
                        xvalue = fmod(xvalue, TData( 2.0 * M_PI ));

                generator.SetXPos( xvalue );
        }


}//namespace CLAM

#endif // _WaveGenerator_