audiooutput.h - mozsearch

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// Copyright (C) 2017 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#ifndef AUDIOOUTPUT_H

#define AUDIOOUTPUT_H

#include <QAudioSink>

#include <QByteArray>

#include <QComboBox>

#include <QIODevice>

#include <QLabel>

#include <QMainWindow>

#include <QMediaDevices>

#include <QMessageBox>

#include <QObject>

#include <QPushButton>

#include <QSlider>

#include <QTimer>

class Generator : public QIODevice

    Q_OBJECT

public:

    Generator(const QAudioFormat &format, qint64 durationUs, int frequency);

    void start();

    void stop();

    qint64 readData(char *data, qint64 maxlen) override;

    qint64 writeData(const char *data, qint64 len) override;

    qint64 bytesAvailable() const override;

    qint64 size() const override { return m_buffer.size(); }

private:

    void generateData(const QAudioFormat &format, qint64 durationUs, int frequency);

private:

    qint64 m_pos = 0;

    QByteArray m_buffer;

};

enum class AudioTestMode {

    Pull,

    Push,

    Callback,

};

class AudioTest : public QMainWindow

    Q_OBJECT

public:

    AudioTest();

    ~AudioTest();

private:

    void initializeWindow();

    void startAudioSink(const QAudioDevice &, const QAudioFormat &);

    void cleanupAudioSink();

private:

    QMediaDevices *m_devices = nullptr;

    QTimer *m_pushTimer = nullptr;

    // Owned by layout

    QComboBox *m_channelsBox = nullptr;

    QComboBox *m_rateBox = nullptr;

    QComboBox *m_formatBox = nullptr;

    QComboBox *m_modeBox = nullptr;

    QPushButton *m_suspendResumeButton = nullptr;

    QComboBox *m_deviceBox = nullptr;

    QComboBox *m_periodBox = nullptr;

    QLabel *m_volumeLabel = nullptr;

    QSlider *m_volumeSlider = nullptr;

    std::unique_ptr<Generator> m_generator;

    std::unique_ptr<QAudioSink> m_audioSink;

    AudioTestMode m_mode = AudioTestMode::Pull;

    QAudioDevice m_currentDevice;

    void restartAudioStream();

private slots:

    void formatChanged(QComboBox *box);

    void toggleSuspendResume();

    void deviceChanged(int index);

    void volumeChanged(int);

    void updateAudioDevices();

};

#endif // AUDIOOUTPUT_H