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Viewing changes to nvdaHelper/local/beeps.cpp

  • Committer: Masataka Shinke
  • Date: 2011-10-25 12:35:26 UTC
  • mfrom: (4185 jpmain)
  • mto: This revision was merged to the branch mainline in revision 4211.
  • Revision ID: mshinke@users.sourceforge.jp-20111025123526-ze527a2rl3z0g2ky
lp:~nishimotz/nvdajp/main : 4185 をマージ

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nvdaHelper/local/beeps.cpp
 
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/*
 
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This file is a part of the NVDA project.
 
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URL: http://www.nvda-project.org/
 
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Copyright 2006-2010 NVDA contributers.
 
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    This program is free software: you can redistribute it and/or modify
 
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    it under the terms of the GNU General Public License version 2.0, as published by
 
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    the Free Software Foundation.
 
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    This program is distributed in the hope that it will be useful,
 
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
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This license can be found at:
 
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http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 
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*/
 
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#define _USE_MATH_DEFINES
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#include <cmath>
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#include "beeps.h"
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using namespace std;
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const float PITWO=M_PI*2;
 
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const double PITWO=M_PI*2;
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const unsigned sampleRate=44100;
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const int amplitude=14000;
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unsigned generateBeep(short* buf, const float hz, const unsigned length, const unsigned char left, const unsigned char right) {
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        const unsigned samplesPerCycle=(sampleRate/hz);
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        unsigned totalSamples=(length/1000.0)/(1.0/sampleRate);
 
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        const unsigned samplesPerCycle=static_cast<unsigned int>(sampleRate/hz);
 
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        unsigned totalSamples=static_cast<unsigned int>((length/1000.0)/(1.0/sampleRate));
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        totalSamples+=(samplesPerCycle-(totalSamples%samplesPerCycle));
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        if (!buf) { //just return buffer length
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                return totalSamples*4;
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        }
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        const float sinFreq=PITWO/samplesPerCycle;
 
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        const double sinFreq=PITWO/samplesPerCycle;
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        for (unsigned sampleNum=0; sampleNum<totalSamples; ++sampleNum) {
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                const short sample=min(max(sin((sampleNum%sampleRate)*sinFreq)*2,-1),1)*amplitude;
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                const short leftSample=sample*(left/100.0);
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                const short rightSample=sample*(right/100.0);
 
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                const short sample=static_cast<short>(min(max(sin((sampleNum%sampleRate)*sinFreq)*2,-1),1)*amplitude);
 
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                const short leftSample=static_cast<short>(sample*(left/100.0));
 
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                const short rightSample=static_cast<short>(sample*(right/100.0));
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                buf[sampleNum*2]=leftSample;
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                buf[sampleNum*2+1]=rightSample;
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        }