qgst_bus_observer_p.h

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// Copyright (C) 2024 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QGST_BUS_OBSERVER_P_H

#define QGST_BUS_OBSERVER_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API. It exists purely as an

// implementation detail. This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtCore/qsocketnotifier.h>

#include <QtCore/qwineventnotifier.h>

#include <QtCore/qmutex.h>

#include "qgst_p.h"

#include "qgstreamermessage_p.h"

QT_BEGIN_NAMESPACE

class QGstreamerBusMessageFilter

public:

    // returns true if message was processed and should be dropped, false otherwise

    virtual bool processBusMessage(const QGstreamerMessage &message) = 0;

};

class QGstBusObserver : private QGstBusHandle

public:

    using QGstBusHandle::get;

    using QGstBusHandle::HasRef;

    using QGstBusHandle::RefMode;

    explicit QGstBusObserver(QGstBusHandle);

    ~QGstBusObserver();

    QGstBusObserver(const QGstBusObserver &) = delete;

    QGstBusObserver(QGstBusObserver &&) = delete;

    QGstBusObserver &operator=(const QGstBusObserver &) = delete;

    QGstBusObserver &operator=(QGstBusObserver &&) = delete;

    void close();

    void installMessageFilter(QGstreamerBusMessageFilter *);

    void removeMessageFilter(QGstreamerBusMessageFilter *);

    bool processNextPendingMessage(GstMessageType type = GST_MESSAGE_ANY,

                                   std::optional<std::chrono::nanoseconds> timeout = {});

    bool currentThreadIsNotifierThread() const;

private:

    void processAllPendingMessages();

#ifndef Q_OS_WIN

    QSocketNotifier m_socketNotifier{ QSocketNotifier::Read };

#else

    QWinEventNotifier m_socketNotifier{};

#endif

    QList<QGstreamerBusMessageFilter *> busFilters;

};

QT_END_NAMESPACE

#endif // QGST_BUS_OBSERVER_P_H