libs/rubberband/src/SilentAudioCurve.cpp

   1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
   2
   3 /*
   4     Rubber Band
   5     An audio time-stretching and pitch-shifting library.
   6     Copyright 2007-2008 Chris Cannam.
   7
   8     This program is free software; you can redistribute it and/or
   9     modify it under the terms of the GNU General Public License as
  10     published by the Free Software Foundation; either version 2 of the
  11     License, or (at your option) any later version.  See the file
  12     COPYING included with this distribution for more information.
  13 */
  14
  15 #include "SilentAudioCurve.h"
  16
  17 #include <cmath>
  18
  19 namespace RubberBand
  20 {
  21
  22 SilentAudioCurve::SilentAudioCurve(size_t sampleRate, size_t windowSize) :
  23     AudioCurve(sampleRate, windowSize)
  24 {
  25 }
  26
  27 SilentAudioCurve::~SilentAudioCurve()
  28 {
  29 }
  30
  31 void
  32 SilentAudioCurve::reset()
  33 {
  34 }
  35
  36 void
  37 SilentAudioCurve::setWindowSize(size_t newSize)
  38 {
  39     m_windowSize = newSize;
  40 }
  41
  42 float
  43 SilentAudioCurve::process(const float *R__ mag, size_t)
  44 {
  45     const int hs = m_windowSize / 2;
  46     static float threshold = powf(10.f, -6);
  47
  48     for (int i = 0; i <= hs; ++i) {
  49         if (mag[i] > threshold) return 0.f;
  50     }
  51
  52     return 1.f;
  53 }
  54
  55 float
  56 SilentAudioCurve::processDouble(const double *R__ mag, size_t)
  57 {
  58     const int hs = m_windowSize / 2;
  59     static double threshold = pow(10.0, -6);
  60
  61     for (int i = 0; i <= hs; ++i) {
  62         if (mag[i] > threshold) return 0.f;
  63     }
  64
  65     return 1.f;
  66 }
  67
  68 }
  69