qpipewire_async_support_p.h

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// Copyright (C) 2025 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 QPIPEWIRE_ASYNC_SUPPORT_P_H
#define QPIPEWIRE_ASYNC_SUPPORT_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 <QtMultimedia/private/qpipewire_support_p.h>
#include <QtCore/private/qexpected_p.h>
#include <QtCore/qglobal.h>
#include <QtCore/qsemaphore.h>
 
#include <spa/utils/hook.h>
 
#include <functional>
 
QT_BEGIN_NAMESPACE
 
namespace QtPipeWire {
 
struct SpaListenerBase
{
    explicit SpaListenerBase();
    Q_DISABLE_COPY_MOVE(SpaListenerBase)
 
    int sequenceNumber() const { return m_sequenceNumber; }
 
protected:
    void removeHooks();
 
    int m_sequenceNumber;
    spa_hook m_listenerHook{};
};
 
struct NodeEventListener final : SpaListenerBase
{
    using InfoHandler = std::function<void(const struct pw_node_info *)>;
    using ParamHandler = std::function<void(int /*seq*/, uint32_t /*id*/, uint32_t /*index*/,
                                            uint32_t /*next*/, const struct spa_pod * /*param*/)>;
 
    struct NodeHandler
    {
        InfoHandler infoHandler;
        ParamHandler paramHandler;
    };
 
    explicit NodeEventListener(PwNodeHandle, NodeHandler);
    ~NodeEventListener();
 
    void enumParams(spa_param_type);
 
private:
    PwNodeHandle m_node;
    NodeHandler m_handler;
 
    static void onInfo(void *userData, const struct pw_node_info *);
    static void onParam(void *userData, int seq, uint32_t id, uint32_t index, uint32_t next,
                        const struct spa_pod *);
};
 
struct CoreEventListener : SpaListenerBase
{
protected:
    CoreEventListener();
    ~CoreEventListener();
 
    pw_core_events coreEvents{};
};
 
struct CoreEventDoneListener : CoreEventListener
{
    CoreEventDoneListener();
    q23::expected<void, int> asyncWait(pw_core *coreConnection, std::function<void()> handler);
 
private:
    int m_seqnum = -1;
    std::function<void()> m_handler;
};
 
struct CoreEventSyncHelper : CoreEventDoneListener
{
    CoreEventSyncHelper();
    q23::expected<bool, int> sync(pw_core *coreConnection,
                                  std::optional<std::chrono::nanoseconds> timeout = {});
 
private:
    QSemaphore m_semaphore;
};
 
} // namespace QtPipeWire
 
QT_END_NAMESPACE
 
#endif // QPIPEWIRE_ASYNC_SUPPORT_P_H