audioinput.h

来自「Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3」· C头文件 代码 · 共 88 行

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#ifndef AUDIOINPUT_H
#define AUDIOINPUT_H


#include <qobject.h>


class AudioInputPrivate;


class AudioInput : public QObject {
    Q_OBJECT
public:
    AudioInput( unsigned int frequency = 44000, unsigned int channels = 2 );
    ~AudioInput();

    int read( short *buffer, unsigned int length );

    unsigned int channels() const;
    unsigned int frequency() const;
    unsigned int bufferSize() const;

    bool isActive() const;

    // Each volume level is from 0 to 0xFFFF
    static void getVolume( unsigned int& left, unsigned int& right );
    static void setVolume( unsigned int  left, unsigned int  right );

    static unsigned int leftVolume()  { unsigned int l, r; getVolume( l, r ); return l;     }
    static unsigned int rightVolume() { unsigned int l, r; getVolume( l, r ); return r;     }

    static void increaseVolume() { setVolume( leftVolume() + 1968, rightVolume() + 1968 ); }
    static void decreaseVolume() { setVolume( leftVolume() - 1966, rightVolume() - 1966 ); }

    long position() const;

public slots:
    // Convenience functions derived from the above functions.
    void setVolume( unsigned int level ) { setVolume( level, level ); }

    void start();
    void stop();

signals:
    void dataAvailable();

private:
    AudioInputPrivate *d;
};


#endif // AUDIOINPUT_H