Qt 4.8: voiceanalyzer.h Example File (demos/mobile/guitartuner/src/voiceanalyzer.h)

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# voiceanalyzer.h Example File

demos/mobile/guitartuner/src/voiceanalyzer.h

     /****************************************************************************
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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