qpipewire_audiocontextmanager_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_AUDIOCONTEXTMANAGER_P_H
#define QPIPEWIRE_AUDIOCONTEXTMANAGER_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_audiodevicemonitor_p.h>
#include <QtMultimedia/private/qpipewire_registry_support_p.h>
#include <QtMultimedia/private/qpipewire_support_p.h>
#include <QtCore/qglobal.h>
 
#include <pipewire/pipewire.h>
 
QT_BEGIN_NAMESPACE
 
namespace QtPipeWire {
 
class QPipeWireInstance;
struct QPipewireAudioStream;
 
class QAudioContextManager
{
public:
    QAudioContextManager();
    ~QAudioContextManager();
 
    static bool minimumRequirementMet();
 
    static QAudioContextManager *instance();
    bool isConnected() const;
 
    template <typename Closure>
    static auto withEventLoopLock(Closure &&c)
    {
        QAudioContextManager *self = instance();
 
        return self->runWithEventLoopLock(std::forward<Closure>(c));
    }
 
    static QAudioDeviceMonitor &deviceMonitor();
 
    static bool isInPwThreadLoop();
    static pw_loop *getEventLoop();
 
    PwNodeHandle bindNode(ObjectId);
    PwMetadataHandle bindMetadata(ObjectId);
 
    void syncRegistry();
 
    void registerStreamReference(std::shared_ptr<QPipewireAudioStream>);
    void unregisterStreamReference(const std::shared_ptr<QPipewireAudioStream> &);
 
    const PwCoreConnectionHandle &coreConnection() const;
 
private:
    template <typename Closure>
    auto runWithEventLoopLock(Closure &&c)
    {
        pw_thread_loop_lock(m_eventLoop.get());
        auto unlock = qScopeGuard([&] {
            pw_thread_loop_unlock(m_eventLoop.get());
        });
 
        return c();
    }
 
    std::shared_ptr<QPipeWireInstance> m_libraryInstance;
 
    // event loop
    PwThreadLoopHandle m_eventLoop;
    void prepareEventLoop();
    void startEventLoop();
    void stopEventLoop();
 
    // pipewire context
    PwContextHandle m_context;
    void prepareContext();
 
    // pw_core connection
    PwCoreConnectionHandle m_coreConnection;
    void connectToPipewireInstance();
 
    // device monitor
    PwRegistryHandle m_registry;
    spa_hook m_registryListener{};
    std::unique_ptr<QAudioDeviceMonitor> m_deviceMonitor;
 
    void startDeviceMonitor();
    void stopDeviceMonitor();
    static void objectAddedCb(void *data, uint32_t id, uint32_t permissions, const char *type,
                              uint32_t version, const struct spa_dict *props);
    static void objectRemovedCb(void *data, uint32_t id);
    void objectAdded(ObjectId id, uint32_t permissions, PipewireRegistryType, uint32_t version,
                     const spa_dict &props);
    void objectRemoved(ObjectId id);
 
    // default metadata object
    void startListenDefaultMetadataObject(ObjectId, uint32_t version);
    void stopListenDefaultMetadataObject();
    struct MetadataRecord
    {
        const char *key;
        const char *type;
        const char *value;
    };
 
    int handleDefaultMetadataObjectEvent(ObjectId subject, const MetadataRecord &);
 
    PwMetadataHandle m_defaultMetadataObject;
    spa_hook m_defaultMetadataObjectListener{};
 
    QMutex m_activeStreamMutex;
    std::set<std::shared_ptr<QPipewireAudioStream>> m_activeStreams;
    void stopActiveStreams();
};
 
} // namespace QtPipeWire
 
QT_END_NAMESPACE
 
#endif // QPIPEWIRE_AUDIOCONTEXTMANAGER_P_H