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/*
* Copyright (C) 2002,2003 by Jonathan Naylor G4KLX/HB9DRD
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <cmath>
using namespace std;
#include "common/SoundFile.h"
#include "common/Average.h"
#include "common/FFT.h"
#include "common/Exception.h"
#include "common/Hamming.h"
#include "AudioData.h"
int main(int argc, char **argv)
{
if (argc < 4) {
::fprintf(stderr, "Usage: AudioData <freq res> <sample rate> <filename>\n");
return 1;
}
double freqRes = ::atof(argv[1]);
int sampleRate = ::atoi(argv[2]);
wxString fileName = wxString(argv[3]);
try {
CAudioData speed(freqRes, sampleRate, fileName);
speed.run();
}
catch (CException& ex) {
fprintf(stderr, "AudioData: %s\n", ex.getMessage().c_str());
return 1;
}
return 0;
}
CAudioData::CAudioData(double freqRes, int sampleRate, const wxString& fileName) :
m_freqRes(freqRes),
m_sampleRate(sampleRate),
m_fileName(fileName)
{
}
CAudioData::~CAudioData()
{
}
void CAudioData::run()
{
int fftLength = int(double(m_sampleRate) / m_freqRes + 0.5);
int minBin = (300 * fftLength) / m_sampleRate;
int maxBin = (2500 * fftLength) / m_sampleRate;
CAverage amplitude;
CAverage* binValues = new CAverage[maxBin];
CFFT fft(fftLength);
CHamming hamming(fftLength);
CSoundDev* file = new CSoundFile;
file->openRead(m_fileName, m_sampleRate, 16);
double* in = new double[fftLength];
double* out = new double[fftLength];
for (;;) {
int len = fftLength;
if (!file->read(in, len))
break;
for (int i = 0; i < len; i++)
amplitude.addValue(in[i] * in[i]);
hamming.filter(in, out);
double* bins = fft.process(out);
for (int i = 0; i < maxBin; i++)
binValues[i].addValue(bins[i]);
}
file->close();
printf("Audio Amplitude: %d samples, min/ave/max: %.2f/%.2f/%.2f\n",
amplitude.getCount(),
::sqrt(amplitude.getMinimum()),
::sqrt(amplitude.getAverage()),
::sqrt(amplitude.getMaximum()));
int highestBin = 0;
double highestVal = 0.0;
int lowestBin = 0;
double lowestVal = 999.0;
for (int i = minBin; i < maxBin; i++) {
if (binValues[i].getMaximum() > highestVal) {
highestBin = i;
highestVal = binValues[i].getMaximum();
}
if (binValues[i].getMinimum() < lowestVal) {
lowestBin = i;
lowestVal = binValues[i].getMinimum();
}
}
double highestFreq = double(m_sampleRate * highestBin) / double(fftLength);
double lowestFreq = double(m_sampleRate * lowestBin) / double(fftLength);
printf("Bin Values: highest: %d/%.1fHz/%.2f lowest: %d/%.1fHz/%.2f\n",
highestBin, highestFreq, highestVal,
lowestBin, lowestFreq, lowestVal);
for (int i = minBin; i < highestBin; i++) {
double val = binValues[i].getMaximum();
for (double dB = -1.0; dB >= -7.0; dB -= 1.0) {
if (nearTo(val, dB, highestVal)) {
double freq = double(m_sampleRate * i) / double(fftLength);
printf("%.0fdB at %d/%.1fHz\n", dB, i, freq);
break;
}
}
}
printf("0dB at %d/%.1fHz\n", highestBin, highestFreq);
for (int i = highestBin + 1; i < maxBin; i++) {
double val = binValues[i].getMaximum();
for (double dB = -1.0; dB >= -7.0; dB -= 1.0) {
if (nearTo(val, dB, highestVal)) {
double freq = double(m_sampleRate * i) / double(fftLength);
printf("%.0fdB at %d/%.1fHz\n", dB, i, freq);
break;
}
}
}
delete file;
delete[] in;
delete[] out;
delete[] binValues;
}
bool CAudioData::nearTo(double val, double dB, double maxVal) const
{
double ratio = ::pow(10.0, dB / 10.0);
double wantedVal = maxVal * ratio;
return val >= wantedVal;
}
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