NotificationAudio.h

#ifndef NOTIFICATIONAUDIO_H
#define NOTIFICATIONAUDIO_H
 
#include <QAudioDevice>
#include <QBuffer>
#include <QByteArray>
#include <QHash>
#include <QPair>
#include <QScopedPointer>
 
class SoundOutput;
 
class NotificationAudio : public QObject {
    Q_OBJECT
 
  public:
    explicit NotificationAudio(QObject *parent = nullptr);
    ~NotificationAudio();
 
  public slots:
    void status(QString message);
    void error(QString message);
    void setDevice(const QAudioDevice &device, unsigned msBuffer = 0);
    void play(const QString &filePath);
    void stop();
 
  private:
    using Entry = QPair<QAudioFormat, QByteArray>;
    using Cache = QHash<QString, Entry>;
 
    void playEntry(Cache::const_iterator);
    static QByteArray pcm24le_to_int32le(const QByteArray &in);
    static bool upmixMonoToStereoInPlace(QAudioFormat &fmt, QByteArray &data);
 
    QScopedPointer<SoundOutput> m_stream;
    Cache m_cache;
    QAudioDevice m_device;
    QBuffer m_buffer;
    unsigned m_msBuffer;
};
 
#endif // NOTIFICATIONAUDIO_H