/usr/include/stk/NRev.h is in libstk0-dev 4.4.4-4.
This file is owned by root:root, with mode 0o644.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | #ifndef STK_NREV_H
#define STK_NREV_H
#include "Effect.h"
#include "Delay.h"
namespace stk {
/***************************************************/
/*! \class NRev
\brief CCRMA's NRev reverberator class.
This class takes a monophonic input signal and produces a stereo
output signal. It is derived from the CLM NRev function, which is
based on the use of networks of simple allpass and comb delay
filters. This particular arrangement consists of 6 comb filters
in parallel, followed by 3 allpass filters, a lowpass filter, and
another allpass in series, followed by two allpass filters in
parallel with corresponding right and left outputs.
by Perry R. Cook and Gary P. Scavone, 1995-2012.
*/
/***************************************************/
class NRev : public Effect
{
public:
//! Class constructor taking a T60 decay time argument (one second default value).
NRev( StkFloat T60 = 1.0 );
//! Reset and clear all internal state.
void clear( void );
//! Set the reverberation T60 decay time.
void setT60( StkFloat T60 );
//! Return the specified channel value of the last computed stereo frame.
/*!
Use the lastFrame() function to get both values of the last
computed stereo frame. The \c channel argument must be 0 or 1
(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.
*/
StkFloat lastOut( unsigned int channel = 0 );
//! Input one sample to the effect and return the specified \c channel value of the computed stereo frame.
/*!
Use the lastFrame() function to get both values of the computed
stereo output frame. The \c channel argument must be 0 or 1 (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.
*/
StkFloat tick( StkFloat input, unsigned int channel = 0 );
//! Take a channel of the StkFrames object as inputs to the effect and replace with stereo outputs.
/*!
The StkFrames argument reference is returned. The stereo
outputs are written to the StkFrames argument starting at the
specified \c channel. Therefore, the \c channel argument must be
less than ( channels() - 1 ) of 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 );
//! Take a channel of the \c iFrames object as inputs to the effect and write stereo outputs to the \c oFrames object.
/*!
The \c iFrames object reference is returned. The \c iChannel
argument must be less than the number of channels in the \c
iFrames argument (the first channel is specified by 0). The \c
oChannel argument must be less than ( channels() - 1 ) of the \c
oFrames argument. 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& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
protected:
Delay allpassDelays_[8];
Delay combDelays_[6];
StkFloat allpassCoefficient_;
StkFloat combCoefficient_[6];
StkFloat lowpassState_;
};
inline StkFloat NRev :: lastOut( unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel > 1 ) {
oStream_ << "NRev::lastOut(): channel argument must be less than 2!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
return lastFrame_[channel];
}
inline StkFloat NRev :: tick( StkFloat input, unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel > 1 ) {
oStream_ << "NRev::tick(): channel argument must be less than 2!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
StkFloat temp, temp0, temp1, temp2, temp3;
int i;
temp0 = 0.0;
for ( i=0; i<6; i++ ) {
temp = input + (combCoefficient_[i] * combDelays_[i].lastOut());
temp0 += combDelays_[i].tick(temp);
}
for ( i=0; i<3; i++ ) {
temp = allpassDelays_[i].lastOut();
temp1 = allpassCoefficient_ * temp;
temp1 += temp0;
allpassDelays_[i].tick(temp1);
temp0 = -(allpassCoefficient_ * temp1) + temp;
}
// One-pole lowpass filter.
lowpassState_ = 0.7 * lowpassState_ + 0.3 * temp0;
temp = allpassDelays_[3].lastOut();
temp1 = allpassCoefficient_ * temp;
temp1 += lowpassState_;
allpassDelays_[3].tick( temp1 );
temp1 = -( allpassCoefficient_ * temp1 ) + temp;
temp = allpassDelays_[4].lastOut();
temp2 = allpassCoefficient_ * temp;
temp2 += temp1;
allpassDelays_[4].tick( temp2 );
lastFrame_[0] = effectMix_*( -( allpassCoefficient_ * temp2 ) + temp );
temp = allpassDelays_[5].lastOut();
temp3 = allpassCoefficient_ * temp;
temp3 += temp1;
allpassDelays_[5].tick( temp3 );
lastFrame_[1] = effectMix_*( - ( allpassCoefficient_ * temp3 ) + temp );
temp = ( 1.0 - effectMix_ ) * input;
lastFrame_[0] += temp;
lastFrame_[1] += temp;
return lastFrame_[channel];
}
} // stk namespace
#endif
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