f@0: /***************************************************/
f@0: /*! \class SineWave
f@0:     \brief STK sinusoid oscillator class.
f@0: 
f@0:     This class computes and saves a static sine "table" that can be
f@0:     shared by multiple instances.  It has an interface similar to the
f@0:     WaveLoop class but inherits from the Generator class.  Output
f@0:     values are computed using linear interpolation.
f@0: 
f@0:     The "table" length, set in SineWave.h, is 2048 samples by default.
f@0: 
f@0:     by Perry R. Cook and Gary P. Scavone, 1995--2014.
f@0: */
f@0: /***************************************************/
f@0: 
f@0: #include "../include/SineWave.h"
f@0: #include <cmath>
f@0: 
f@0: namespace stk {
f@0: 
f@0: StkFrames SineWave :: table_;
f@0: 
f@0: SineWave :: SineWave( void )
f@0:   : time_(0.0), rate_(1.0), phaseOffset_(0.0)
f@0: {
f@0:   if ( table_.empty() ) {
f@0:     table_.resize( TABLE_SIZE + 1, 1 );
f@0:     StkFloat temp = 1.0 / TABLE_SIZE;
f@0:     for ( unsigned long i=0; i<=TABLE_SIZE; i++ )
f@0:       table_[i] = sin( TWO_PI * i * temp );
f@0:   }
f@0: 
f@0:   Stk::addSampleRateAlert( this );
f@0: }
f@0: 
f@0: SineWave :: ~SineWave()
f@0: {
f@0:   Stk::removeSampleRateAlert( this );
f@0: }
f@0: 
f@0: void SineWave :: sampleRateChanged( StkFloat newRate, StkFloat oldRate )
f@0: {
f@0:   if ( !ignoreSampleRateChange_ )
f@0:     this->setRate( oldRate * rate_ / newRate );
f@0: }
f@0: 
f@0: void SineWave :: reset( void )
f@0: {
f@0:   time_ = 0.0;
f@0:   lastFrame_[0] = 0;
f@0: }
f@0: 
f@0: void SineWave :: setFrequency( StkFloat frequency )
f@0: {
f@0:   // This is a looping frequency.
f@0:   this->setRate( TABLE_SIZE * frequency / Stk::sampleRate() );
f@0: }
f@0: 
f@0: void SineWave :: addTime( StkFloat time )
f@0: {
f@0:   // Add an absolute time in samples.
f@0:   time_ += time;
f@0: }
f@0: 
f@0: void SineWave :: addPhase( StkFloat phase )
f@0: {
f@0:   // Add a time in cycles (one cycle = TABLE_SIZE).
f@0:   time_ += TABLE_SIZE * phase;
f@0: }
f@0: 
f@0: void SineWave :: addPhaseOffset( StkFloat phaseOffset )
f@0: {
f@0:   // Add a phase offset relative to any previous offset value.
f@0:   time_ += ( phaseOffset - phaseOffset_ ) * TABLE_SIZE;
f@0:   phaseOffset_ = phaseOffset;
f@0: }
f@0: 
f@0: } // stk namespace