SimpleOscillator.cxx

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00001 /*
00002  * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
00003  *                         UNIVERSITAT POMPEU FABRA
00004  *
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this program; if not, write to the Free Software
00018  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00019  *
00020  */
00021 
00022 #include "SimpleOscillator.hxx"
00023 #include "ProcessingFactory.hxx"
00024 
00025 namespace CLAM
00026 {
00027 
00028 namespace Hidden
00029 {
00030         static const char * metadata[] = {
00031                 "key", "SimpleOscillator",
00032                 "category", "Generators",
00033                 "description", "SimpleOscillator",
00034                 0
00035         };
00036         static FactoryRegistrator<ProcessingFactory, SimpleOscillator> reg = metadata;
00037 }
00038 
00039         
00040 // OscillatorConfig method definition
00041 void SimpleOscillatorConfig::DefaultInit(void)
00042 {
00043         AddFrequency();
00044         AddAmplitude();
00045         AddPhase();
00046         AddSamplingRate();
00047         
00048         UpdateData();
00049 
00050         SetFrequency(440.0);
00051         SetAmplitude(1.0);
00052         SetPhase(0.0);
00053         SetSamplingRate( 44100 );
00054 }
00055 
00056 SimpleOscillator::SimpleOscillator( const SimpleOscillatorConfig& cfg )
00057         : mOutput("Audio Output", this)
00058         , mFreqUpdated( false )
00059         , mAmpUpdated( false )
00060         , mFreqCtl( "Pitch", this, &SimpleOscillator::UpdateFreq )
00061         , mAmpCtl( "Amplitude", this, &SimpleOscillator::UpdateAmp )
00062         , mSamplesBetweenCallsCtl("SamplesBetweenCalls", this)
00063 {
00064         Configure( cfg );
00065 }
00066 
00067 SimpleOscillator::~SimpleOscillator()
00068 {
00069 }
00070 
00071 bool SimpleOscillator::ConcreteConfigure( const ProcessingConfig& c )
00072 {
00073         CopyAsConcreteConfig(mConfig, c);
00074 
00075 
00076         mAmp = mConfig.GetAmplitude();
00077         mPhase = mConfig.GetPhase(); // TEMP HACK  (See also constructor
00078         mSamplingRate = mConfig.GetSamplingRate();
00079         mDeltaPhase = TData(2.*PI*mConfig.GetFrequency()/mSamplingRate);
00080         //xamat: kludge to convert this into an LFO, eventually separate into a different class
00081         mSamplesBetweenCallsCtl.DoControl(1);
00082         return true;
00083 }
00084 
00085 bool SimpleOscillator::Do()
00086 {
00087         bool res = false;
00088         res = Do(mOutput.GetAudio());
00089         mOutput.Produce();
00090         return res;
00091 }
00092 
00093 bool SimpleOscillator::Do( Audio& out )
00094 {
00095         if( !AbleToExecute() ) return true;
00096         
00097         ApplyFreqAndAmpControls();
00098 
00099         TData* ptr = out.GetBuffer().GetPtr();
00100         for (int i=0;i<out.GetSize();i++)
00101         {
00102                 (*ptr++) = mAmp * TData(sin(mPhase));
00103                 mPhase += mDeltaPhase;
00104                 
00105                 if (mPhase>TData(2*PI)) 
00106                         mPhase-=TData(2*PI);
00107         }
00108 
00109         return true;
00110 }
00111 
00112 //xamat: kludge to convert this into an LFO, eventually separate into a different class
00113 bool SimpleOscillator::Do( TData& out )
00114 {
00115         if( !AbleToExecute() ) return true;
00116         
00117         ApplyFreqAndAmpControls();
00118 
00119         out = mAmp * TData(sin(mPhase));
00120         mPhase += mDeltaPhase*mSamplesBetweenCallsCtl.GetLastValue();
00121                 
00122         if (mPhase>TData(2*PI)) 
00123                 mPhase-=TData(2*PI);
00124 
00125         return true;
00126 }
00127 
00128 
00129 void SimpleOscillator::UpdateFreq( TControlData value )
00130 {
00131         mFreqUpdated = true;
00132 }
00133 
00134 void SimpleOscillator::UpdateAmp( TControlData value )
00135 {
00136         mAmpUpdated = true;
00137 }
00138 
00139 } // namespace CLAM
00140 
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