mirror of
https://github.com/overte-org/overte.git
synced 2025-06-26 06:09:35 +02:00
147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
#ifndef STK_BRASS_H
|
|
#define STK_BRASS_H
|
|
|
|
#include "Instrmnt.h"
|
|
#include "DelayA.h"
|
|
#include "BiQuad.h"
|
|
#include "PoleZero.h"
|
|
#include "ADSR.h"
|
|
#include "SineWave.h"
|
|
|
|
namespace stk {
|
|
|
|
/***************************************************/
|
|
/*! \class Brass
|
|
\brief STK simple brass instrument class.
|
|
|
|
This class implements a simple brass instrument
|
|
waveguide model, a la Cook (TBone, HosePlayer).
|
|
|
|
This is a digital waveguide model, making its
|
|
use possibly subject to patents held by
|
|
Stanford University, Yamaha, and others.
|
|
|
|
Control Change Numbers:
|
|
- Lip Tension = 2
|
|
- Slide Length = 4
|
|
- Vibrato Frequency = 11
|
|
- Vibrato Gain = 1
|
|
- Volume = 128
|
|
|
|
by Perry R. Cook and Gary P. Scavone, 1995-2012.
|
|
*/
|
|
/***************************************************/
|
|
|
|
class Brass: public Instrmnt
|
|
{
|
|
public:
|
|
//! Class constructor, taking the lowest desired playing frequency.
|
|
/*!
|
|
An StkError will be thrown if the rawwave path is incorrectly set.
|
|
*/
|
|
Brass( StkFloat lowestFrequency = 8.0 );
|
|
|
|
//! Class destructor.
|
|
~Brass( );
|
|
|
|
//! Reset and clear all internal state.
|
|
void clear( );
|
|
|
|
//! Set instrument parameters for a particular frequency.
|
|
void setFrequency( StkFloat frequency );
|
|
|
|
//! Set the lips frequency.
|
|
void setLip( StkFloat frequency );
|
|
|
|
//! Apply breath pressure to instrument with given amplitude and rate of increase.
|
|
void startBlowing( StkFloat amplitude, StkFloat rate );
|
|
|
|
//! Decrease breath pressure with given rate of decrease.
|
|
void stopBlowing( StkFloat rate );
|
|
|
|
//! Start a note with the given frequency and amplitude.
|
|
void noteOn( StkFloat frequency, StkFloat amplitude );
|
|
|
|
//! Stop a note with the given amplitude (speed of decay).
|
|
void noteOff( 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:
|
|
|
|
DelayA delayLine_;
|
|
BiQuad lipFilter_;
|
|
PoleZero dcBlock_;
|
|
ADSR adsr_;
|
|
SineWave vibrato_;
|
|
|
|
StkFloat lipTarget_;
|
|
StkFloat slideTarget_;
|
|
StkFloat vibratoGain_;
|
|
StkFloat maxPressure_;
|
|
|
|
};
|
|
|
|
inline StkFloat Brass :: tick( unsigned int )
|
|
{
|
|
StkFloat breathPressure = maxPressure_ * adsr_.tick();
|
|
breathPressure += vibratoGain_ * vibrato_.tick();
|
|
|
|
StkFloat mouthPressure = 0.3 * breathPressure;
|
|
StkFloat borePressure = 0.85 * delayLine_.lastOut();
|
|
StkFloat deltaPressure = mouthPressure - borePressure; // Differential pressure.
|
|
deltaPressure = lipFilter_.tick( deltaPressure ); // Force - > position.
|
|
deltaPressure *= deltaPressure; // Basic position to area mapping.
|
|
if ( deltaPressure > 1.0 ) deltaPressure = 1.0; // Non-linear saturation.
|
|
|
|
// The following input scattering assumes the mouthPressure = area.
|
|
lastFrame_[0] = deltaPressure * mouthPressure + ( 1.0 - deltaPressure) * borePressure;
|
|
lastFrame_[0] = delayLine_.tick( dcBlock_.tick( lastFrame_[0] ) );
|
|
|
|
return lastFrame_[0];
|
|
}
|
|
|
|
inline StkFrames& Brass :: tick( StkFrames& frames, unsigned int channel )
|
|
{
|
|
unsigned int nChannels = lastFrame_.channels();
|
|
#if defined(_STK_DEBUG_)
|
|
if ( channel > frames.channels() - nChannels ) {
|
|
oStream_ << "Brass::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
|