SimpleOscillator.cxx

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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
 *
 */

#include "SimpleOscillator.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{

namespace Hidden
{
        static const char * metadata[] = {
                "key", "SimpleOscillator",
                "category", "Generators",
                "description", "SimpleOscillator",
                0
        };
        static FactoryRegistrator<ProcessingFactory, SimpleOscillator> reg = metadata;
}

        
// OscillatorConfig method definition
void SimpleOscillatorConfig::DefaultInit(void)
{
        AddFrequency();
        AddAmplitude();
        AddPhase();
        AddSamplingRate();
        
        UpdateData();

        SetFrequency(440.0);
        SetAmplitude(1.0);
        SetPhase(0.0);
        SetSamplingRate( 44100 );
}

SimpleOscillator::SimpleOscillator( const SimpleOscillatorConfig& cfg )
        : mOutput("Audio Output", this)
        , mFreqUpdated( false )
        , mAmpUpdated( false )
        , mFreqCtl( "Pitch", this, &SimpleOscillator::UpdateFreq )
        , mAmpCtl( "Amplitude", this, &SimpleOscillator::UpdateAmp )
        , mSamplesBetweenCallsCtl("SamplesBetweenCalls", this)
{
        Configure( cfg );
}

SimpleOscillator::~SimpleOscillator()
{
}

bool SimpleOscillator::ConcreteConfigure( const ProcessingConfig& c )
{
        CopyAsConcreteConfig(mConfig, c);


        mAmp = mConfig.GetAmplitude();
        mPhase = mConfig.GetPhase(); // TEMP HACK  (See also constructor
        mSamplingRate = mConfig.GetSamplingRate();
        mDeltaPhase = TData(2.*PI*mConfig.GetFrequency()/mSamplingRate);
        //xamat: kludge to convert this into an LFO, eventually separate into a different class
        mSamplesBetweenCallsCtl.DoControl(1);
        return true;
}

bool SimpleOscillator::Do()
{
        bool res = false;
        res = Do(mOutput.GetAudio());
        mOutput.Produce();
        return res;
}

bool SimpleOscillator::Do( Audio& out )
{
        if( !AbleToExecute() ) return true;
        
        ApplyFreqAndAmpControls();

        TData* ptr = out.GetBuffer().GetPtr();
        for (int i=0;i<out.GetSize();i++)
        {
                (*ptr++) = mAmp * TData(sin(mPhase));
                mPhase += mDeltaPhase;
                
                if (mPhase>TData(2*PI)) 
                        mPhase-=TData(2*PI);
        }

        return true;
}

//xamat: kludge to convert this into an LFO, eventually separate into a different class
bool SimpleOscillator::Do( TData& out )
{
        if( !AbleToExecute() ) return true;
        
        ApplyFreqAndAmpControls();

        out = mAmp * TData(sin(mPhase));
        mPhase += mDeltaPhase*mSamplesBetweenCallsCtl.GetLastValue();
                
        if (mPhase>TData(2*PI)) 
                mPhase-=TData(2*PI);

        return true;
}


void SimpleOscillator::UpdateFreq( TControlData value )
{
        mFreqUpdated = true;
}

void SimpleOscillator::UpdateAmp( TControlData value )
{
        mAmpUpdated = true;
}

} // namespace CLAM