This file is indexed.

/usr/include/stk/JCRev.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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
#ifndef STK_JCREV_H
#define STK_JCREV_H

#include "Effect.h"
#include "Delay.h"
#include "OnePole.h"

namespace stk {

/***************************************************/
/*! \class JCRev
    \brief John Chowning's reverberator class.

    This class takes a monophonic input signal and
    produces a stereo output signal.  It is derived
    from the CLM JCRev function, which is based on
    the use of networks of simple allpass and comb
    delay filters.  This class implements three
    series allpass units, followed by four parallel
    comb filters, and two decorrelation delay lines
    in parallel at the output.

    Although not in the original JC reverberator,
    one-pole lowpass filters have been added inside
    the feedback comb filters.

    by Perry R. Cook and Gary P. Scavone, 1995-2012.
*/
/***************************************************/

class JCRev : public Effect
{
 public:
  //! Class constructor taking a T60 decay time argument (one second default value).
  JCRev( 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_[3];
  Delay combDelays_[4];
  OnePole combFilters_[4];
  Delay outLeftDelay_;
  Delay outRightDelay_;
  StkFloat allpassCoefficient_;
  StkFloat combCoefficient_[4];

};

inline StkFloat JCRev :: lastOut( unsigned int channel )
{
#if defined(_STK_DEBUG_)
  if ( channel > 1 ) {
    oStream_ << "JCRev::lastOut(): channel argument must be less than 2!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif

  return lastFrame_[channel];
}

inline StkFloat JCRev :: tick( StkFloat input, unsigned int channel )
{
#if defined(_STK_DEBUG_)
  if ( channel > 1 ) {
    oStream_ << "JCRev::tick(): channel argument must be less than 2!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif

  StkFloat temp, temp0, temp1, temp2, temp3, temp4, temp5, temp6;
  StkFloat filtout;

  temp = allpassDelays_[0].lastOut();
  temp0 = allpassCoefficient_ * temp;
  temp0 += input;
  allpassDelays_[0].tick(temp0);
  temp0 = -(allpassCoefficient_ * temp0) + temp;
    
  temp = allpassDelays_[1].lastOut();
  temp1 = allpassCoefficient_ * temp;
  temp1 += temp0;
  allpassDelays_[1].tick(temp1);
  temp1 = -(allpassCoefficient_ * temp1) + temp;
    
  temp = allpassDelays_[2].lastOut();
  temp2 = allpassCoefficient_ * temp;
  temp2 += temp1;
  allpassDelays_[2].tick(temp2);
  temp2 = -(allpassCoefficient_ * temp2) + temp;
    
  temp3 = temp2 + ( combFilters_[0].tick( combCoefficient_[0] * combDelays_[0].lastOut() ) );
  temp4 = temp2 + ( combFilters_[1].tick( combCoefficient_[1] * combDelays_[1].lastOut() ) );
  temp5 = temp2 + ( combFilters_[2].tick( combCoefficient_[2] * combDelays_[2].lastOut() ) );
  temp6 = temp2 + ( combFilters_[3].tick( combCoefficient_[3] * combDelays_[3].lastOut() ) );

  combDelays_[0].tick(temp3);
  combDelays_[1].tick(temp4);
  combDelays_[2].tick(temp5);
  combDelays_[3].tick(temp6);

  filtout = temp3 + temp4 + temp5 + temp6;

  lastFrame_[0] = effectMix_ * (outLeftDelay_.tick(filtout));
  lastFrame_[1] = effectMix_ * (outRightDelay_.tick(filtout));
  temp = (1.0 - effectMix_) * input;
  lastFrame_[0] += temp;
  lastFrame_[1] += temp;
    
  return 0.7 * lastFrame_[channel];
}

} // stk namespace

#endif