Chris@313: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@313: 
Chris@313: /*
Chris@313:     Sonic Visualiser
Chris@313:     An audio file viewer and annotation editor.
Chris@313:     Centre for Digital Music, Queen Mary, University of London.
Chris@313:     
Chris@313:     This program is free software; you can redistribute it and/or
Chris@313:     modify it under the terms of the GNU General Public License as
Chris@313:     published by the Free Software Foundation; either version 2 of the
Chris@313:     License, or (at your option) any later version.  See the file
Chris@313:     COPYING included with this distribution for more information.
Chris@313: */
Chris@313: 
Chris@313: #ifndef CONTINUOUS_SYNTH_H
Chris@313: #define CONTINUOUS_SYNTH_H
Chris@313: 
Chris@313: /**
Chris@313:  * Mix into a target buffer a signal synthesised so as to sound at a
Chris@313:  * specific frequency. The frequency may change with each processing
Chris@313:  * block, or may be switched on or off.
Chris@313:  */
Chris@313: 
Chris@313: class ContinuousSynth
Chris@313: {
Chris@313: public:
rmb456@323:     ContinuousSynth(int channels, int sampleRate, int blockSize, int waveType);
Chris@313:     ~ContinuousSynth();
Chris@313:     
Chris@313:     void setChannelCount(int channels);
Chris@313: 
Chris@313:     void reset();
Chris@313: 
Chris@313:     /**
Chris@313:      * Mix in a signal to be heard at the given fundamental
Chris@313:      * frequency. Any oscillator state will be maintained between
Chris@313:      * process calls so as to provide a continuous sound. The f0 value
Chris@313:      * may vary between calls.
Chris@313:      *
Chris@313:      * Supply f0 equal to 0 if you want to maintain the f0 from the
Chris@313:      * previous block (without having to remember what it was).
Chris@313:      *
Chris@313:      * Supply f0 less than 0 for silence. You should continue to call
Chris@313:      * this even when the signal is silent if you want to ensure the
Chris@313:      * sound switches on and off cleanly.
Chris@313:      */
Chris@313:     void mix(float **toBuffers,
justin@327:          float gain,
justin@327:          float pan,
justin@327:          float f0);
Chris@313: 
Chris@313: private:
Chris@313:     int m_channels;
Chris@313:     int m_sampleRate;
Chris@313:     int m_blockSize;
Chris@313: 
Chris@313:     double m_prevF0;
Chris@313:     double m_phase;
rmb456@323: 
rmb456@323:     int m_wavetype;
Chris@313: };
Chris@313: 
Chris@313: #endif