[GoogleSpeechAPI]AudioInput - speechInput.h

/*
 * Based on Qt Example
 * PCM2WAV is not mine, I found it in Google and modified it.
 */

#ifndef SPEECHINPUT
#define SPEECHINPUT

#include <QPixmap>
#include <QWidget>
#include <QObject>
#include <QPushButton>
#include <QByteArray>
#include <QAudioInput>
#include <QIODevice>
#include <QFile>

class WavPcmFile : public QFile {
public:
    WavPcmFile(const QString & name, const QAudioFormat & format, QObject *parent = 0);
    bool open();
    void close();

private:
    void writeHeader();
    bool hasSupportedFormat();
    QAudioFormat format;
};

class AudioInfo : public QIODevice
{
    Q_OBJECT
public:
    AudioInfo(const QAudioFormat &format, QObject *parent, const QString &filename = "./data/tmp/speechInput.wav");
    ~AudioInfo();

    void start();
    void stop();

    qreal level() const { return m_level; }

    qint64 readData(char *data, qint64 maxlen);
    qint64 writeData(const char *data, qint64 len);

private:
    const QAudioFormat m_format;
    quint16 m_maxAmplitude;
    qreal m_level; // 0.0 <= m_level <= 1.0

    WavPcmFile * m_file;

signals:
    void update();
};


class RenderArea : public QWidget
{
    Q_OBJECT

public:
    RenderArea(QWidget *parent = 0);

    void setLevel(qreal value);

protected:
    void paintEvent(QPaintEvent *event);

private:
    qreal m_level;
    QPixmap m_pixmap;
};

#endif