voiceanalyzer.h Example File

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 #ifndef VOICEANALYZER_H
 #define VOICEANALYZER_H

 #include <QObject>
 #include <QAudioFormat>
 #include <QDebug>
 #include <QtCore/qmath.h>
 #include <QtCore/qendian.h>
 #include <QVariant>

 #include "constants.h"
 #include "fastfouriertransformer.h"
 #include "math.h"

 class VoiceAnalyzer : public QIODevice
 {
     Q_OBJECT
 public:
     VoiceAnalyzer(const QAudioFormat &format, QObject *parent = 0);
     qint64 readData(char *data, qint64 maxlen);
     qint64 writeData(const char *data, qint64 maxlen);
     void start(qreal frequency);
     void stop();
     qreal frequency();
     int getMaximumVoiceDifference();
     int getMaximumPrecisionPerNote();

 public slots:
     void setCutOffPercentage(qreal cutoff);

 private:
     const QAudioFormat m_format;
     QList<qint16> m_samples;
     int m_totalSampleCount;
     int m_maximumVoiceDifference;

     qint16 getValueInt16(const uchar *ptr);
     int m_stepSize;
     qreal m_frequency;
     qint64 m_position;
     FastFourierTransformer *m_fftHelper;
     void analyzeVoice();
 signals:
     void voiceDifference(QVariant frequency);
     void correctFrequency();
     void lowVoice();

 public slots:

 };

 #endif // VOICEANALYZER_H