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/*
* Copyright (C) 2002-2004 by Jonathan Naylor G4KLX
*
* 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 "common/Inline.h"
#include "AudioData.h"
int main(int argc, char **argv)
{
if (argc < 6) {
::fprintf(stderr, "Usage: AudioData <fft length> <start bin> <end bin> <sample rate> <filename>\n");
return 1;
}
int fftLength = ::atoi(argv[1]);
int startBin = ::atoi(argv[2]);
int endBin = ::atoi(argv[3]);
int sampleRate = ::atoi(argv[4]);
wxString fileName = wxString(argv[5]);
try {
CAudioData data(fftLength, startBin, endBin, sampleRate, fileName);
data.run();
}
catch (CException& ex) {
fprintf(stderr, "AudioData: %s\n", ex.getMessage().c_str());
return 1;
}
return 0;
}
CAudioData::CAudioData(int fftLength, int startBin, int endBin, int sampleRate, const wxString& fileName) :
m_fftLength(fftLength),
m_startBin(startBin),
m_endBin(endBin),
m_sampleRate(sampleRate),
m_fileName(fileName)
{
}
CAudioData::~CAudioData()
{
}
void CAudioData::run()
{
CAverage amplitude;
CFFT fft(m_fftLength);
CHamming hamming(m_fftLength);
complex<double>* bins = new complex<double>[m_fftLength];
CSoundFile file(m_fileName, m_sampleRate);
file.openRead();
double* in = new double[30 * m_sampleRate];
double* out = new double[m_fftLength];
int step = int(double(m_fftLength) / 2.0 + 0.5);
int n = 0;
for (;;) {
int len = m_fftLength;
file.read(in + n, len);
if (len <= 0)
break;
for (int i = 0; i < len; i += step) {
amplitude.addValue(in[n + i] * in[n + i]);
if (n >= m_fftLength) {
int offset = n + i - m_fftLength;
hamming.filter(in + offset, out);
fft.process(out, bins);
::fprintf(stderr, "%05d: ", offset);
for (int j = m_startBin; j <= m_endBin; j++) {
double ampl = ::CABS(bins[j]);
double phase = ::CPHASE(bins[j]) / M_PI;
::fprintf(stderr, "%.3f/%.3f ", ampl, phase);
}
::fprintf(stderr, "\n");
}
}
n += len;
}
file.close();
::fprintf(stderr, "Audio Amplitude: %d samples, min/ave/max: %.2f/%.2f/%.2f\n",
amplitude.getCount(),
::sqrt(amplitude.getMinimum()),
::sqrt(amplitude.getAverage()),
::sqrt(amplitude.getMaximum()));
delete[] bins;
delete[] in;
delete[] out;
}
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