mirror of
https://github.com/LMMS/lmms.git
synced 2026-01-25 14:58:07 -05:00
80 lines
1.6 KiB
C++
80 lines
1.6 KiB
C++
/*
|
|
* lfo.h - declaration of Lfo class, a simple sine lfo
|
|
*
|
|
* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
|
|
*
|
|
* This file is part of LMMS - http://lmms.io
|
|
*
|
|
* 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 (see COPYING); if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
* Boston, MA 02110-1301 USA.
|
|
*
|
|
*/
|
|
|
|
#ifndef LFO_H
|
|
#define LFO_H
|
|
|
|
#include "lmms_math.h"
|
|
|
|
class Lfo
|
|
{
|
|
public:
|
|
Lfo( int samplerate );
|
|
~Lfo()
|
|
{
|
|
}
|
|
|
|
|
|
|
|
|
|
inline void setFrequency( double frequency )
|
|
{
|
|
if( frequency < 0 || frequency > ( m_samplerate / 2.0 ) || frequency == m_frequency )
|
|
{
|
|
return;
|
|
}
|
|
m_frequency = frequency;
|
|
m_increment = m_frequency * m_twoPiOverSr;
|
|
|
|
if( m_phase >= F_2PI )
|
|
{
|
|
m_phase -= F_2PI;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
inline void setSampleRate ( int samplerate )
|
|
{
|
|
m_samplerate = samplerate;
|
|
m_twoPiOverSr = F_2PI / samplerate;
|
|
m_increment = m_frequency * m_twoPiOverSr;
|
|
}
|
|
|
|
|
|
|
|
|
|
float tick();
|
|
|
|
private:
|
|
double m_frequency;
|
|
double m_phase;
|
|
double m_increment;
|
|
double m_twoPiOverSr;
|
|
int m_samplerate;
|
|
};
|
|
|
|
#endif // LFO_H
|