1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ 2 3 /* 4 Rubber Band Library 5 An audio time-stretching and pitch-shifting library. 6 Copyright 2007-2021 Particular Programs Ltd. 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 Alternatively, if you have a valid commercial licence for the 15 Rubber Band Library obtained by agreement with the copyright 16 holders, you may redistribute and/or modify it under the terms 17 described in that licence. 18 19 If you wish to distribute code using the Rubber Band Library 20 under terms other than those of the GNU General Public License, 21 you must obtain a valid commercial licence before doing so. 22 */ 23 24 #include "AudioCurveCalculator.h" 25 26 #include <iostream> 27 28 namespace RubberBand 29 { 30 31 static const int MaxPerceivedFreq = 16000; 32 AudioCurveCalculator(Parameters parameters)33AudioCurveCalculator::AudioCurveCalculator(Parameters parameters) : 34 m_sampleRate(parameters.sampleRate), 35 m_fftSize(parameters.fftSize) 36 { 37 recalculateLastPerceivedBin(); 38 } 39 ~AudioCurveCalculator()40AudioCurveCalculator::~AudioCurveCalculator() 41 { 42 } 43 44 void setSampleRate(int newRate)45AudioCurveCalculator::setSampleRate(int newRate) 46 { 47 m_sampleRate = newRate; 48 recalculateLastPerceivedBin(); 49 } 50 51 void setFftSize(int newSize)52AudioCurveCalculator::setFftSize(int newSize) 53 { 54 m_fftSize = newSize; 55 recalculateLastPerceivedBin(); 56 } 57 58 void recalculateLastPerceivedBin()59AudioCurveCalculator::recalculateLastPerceivedBin() 60 { 61 if (m_sampleRate == 0) { 62 m_lastPerceivedBin = 0; 63 return; 64 } 65 m_lastPerceivedBin = ((MaxPerceivedFreq * m_fftSize) / m_sampleRate); 66 if (m_lastPerceivedBin > m_fftSize/2) { 67 m_lastPerceivedBin = m_fftSize/2; 68 } 69 } 70 71 72 } 73