/usr/include/stk/FMVoices.h is in libstk0-dev 4.4.4-5+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | #ifndef STK_FMVOICES_H
#define STK_FMVOICES_H
#include "FM.h"
namespace stk {
/***************************************************/
/*! \class FMVoices
\brief STK singing FM synthesis instrument.
This class implements 3 carriers and a common
modulator, also referred to as algorithm 6 of
the TX81Z.
\code
Algorithm 6 is :
/->1 -\
4-|-->2 - +-> Out
\->3 -/
\endcode
Control Change Numbers:
- Vowel = 2
- Spectral Tilt = 4
- LFO Speed = 11
- LFO Depth = 1
- ADSR 2 & 4 Target = 128
The basic Chowning/Stanford FM patent expired
in 1995, but there exist follow-on patents,
mostly assigned to Yamaha. If you are of the
type who should worry about this (making
money) worry away.
by Perry R. Cook and Gary P. Scavone, 1995-2012.
*/
/***************************************************/
class FMVoices : public FM
{
public:
//! Class constructor.
/*!
An StkError will be thrown if the rawwave path is incorrectly set.
*/
FMVoices( void );
//! Class destructor.
~FMVoices( void );
//! Set instrument parameters for a particular frequency.
void setFrequency( StkFloat frequency );
//! Start a note with the given frequency and amplitude.
void noteOn( StkFloat frequency, StkFloat amplitude );
//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
void controlChange( int number, StkFloat value );
//! Compute and return one output sample.
StkFloat tick( unsigned int channel = 0 );
//! Fill a channel of the StkFrames object with computed outputs.
/*!
The \c channel argument must be less than the number of
channels in the StkFrames argument (the first channel is specified
by 0). However, range checking is only performed if _STK_DEBUG_
is defined during compilation, in which case an out-of-range value
will trigger an StkError exception.
*/
StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
protected:
int currentVowel_;
StkFloat tilt_[3];
StkFloat mods_[3];
};
inline StkFloat FMVoices :: tick( unsigned int )
{
register StkFloat temp, temp2;
temp = gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
temp2 = vibrato_.tick() * modDepth_ * 0.1;
waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[0]);
waves_[1]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[1]);
waves_[2]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[2]);
waves_[3]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[3]);
waves_[0]->addPhaseOffset(temp * mods_[0]);
waves_[1]->addPhaseOffset(temp * mods_[1]);
waves_[2]->addPhaseOffset(temp * mods_[2]);
waves_[3]->addPhaseOffset( twozero_.lastOut() );
twozero_.tick( temp );
temp = gains_[0] * tilt_[0] * adsr_[0]->tick() * waves_[0]->tick();
temp += gains_[1] * tilt_[1] * adsr_[1]->tick() * waves_[1]->tick();
temp += gains_[2] * tilt_[2] * adsr_[2]->tick() * waves_[2]->tick();
lastFrame_[0] = temp * 0.33;
return lastFrame_[0];
}
inline StkFrames& FMVoices :: tick( StkFrames& frames, unsigned int channel )
{
unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
if ( channel > frames.channels() - nChannels ) {
oStream_ << "FMVoices::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
StkFloat *samples = &frames[channel];
unsigned int j, hop = frames.channels() - nChannels;
if ( nChannels == 1 ) {
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
*samples++ = tick();
}
else {
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
*samples++ = tick();
for ( j=1; j<nChannels; j++ )
*samples++ = lastFrame_[j];
}
}
return frames;
}
} // stk namespace
#endif
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