qpulseaudio_contextmanager_p.h

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// Copyright (C) 2016 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 QPULSEAUDIO_CONTEXTMANAGER_P_H
#define QPULSEAUDIO_CONTEXTMANAGER_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/qmap.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qreadwritelock.h>
#include <pulse/pulseaudio.h>
#include "qpulsehelpers_p.h"
#include <qaudioformat.h>
 
QT_BEGIN_NAMESPACE
 
class QPulseAudioContextManager : public QObject
{
    Q_OBJECT
 
    using PAContextHandle = QPulseAudioInternal::PAContextHandle;
    using PAOperationHandle = QPulseAudioInternal::PAOperationHandle;
 
public:
    explicit QPulseAudioContextManager(QObject *parent = nullptr);
    ~QPulseAudioContextManager() override;
 
    static QPulseAudioContextManager *instance();
    pa_threaded_mainloop *mainloop() { return m_mainLoop.get(); }
    pa_context *context() { return m_context.get(); }
 
    void lock()
    {
        if (m_mainLoop)
            pa_threaded_mainloop_lock(m_mainLoop.get());
    }
 
    void unlock()
    {
        if (m_mainLoop)
            pa_threaded_mainloop_unlock(m_mainLoop.get());
    }
 
    void wait(const PAOperationHandle &op)
    {
        while (m_mainLoop && pa_operation_get_state(op.get()) == PA_OPERATION_RUNNING)
            pa_threaded_mainloop_wait(m_mainLoop.get());
    }
 
    bool waitForAsyncOperation(pa_operation *op);
    bool waitForAsyncOperation(const PAOperationHandle &);
 
    bool isInMainLoop() const
    {
        return m_mainLoop && pa_threaded_mainloop_in_thread(m_mainLoop.get());
    }
 
    QList<QAudioDevice> availableDevices(QAudioDevice::Mode mode) const;
    QByteArray defaultDevice(QAudioDevice::Mode mode) const;
 
    pa_context_state_t getContextState();
    bool contextIsGood();
 
    QString serverName();
 
Q_SIGNALS:
    void audioInputsChanged();
    void audioOutputsChanged();
 
private Q_SLOTS:
    void prepare();
    void onContextFailed();
 
private:
    static void serverInfoCallback(pa_context *context, const pa_server_info *info, void *userdata);
    static void sinkInfoCallback(pa_context *context, const pa_sink_info *info, int isLast,
                                 void *userdata);
    static void sourceInfoCallback(pa_context *context, const pa_source_info *info, int isLast,
                                   void *userdata);
    static void eventCallback(pa_context *context, pa_subscription_event_type_t t, uint32_t index,
                              void *userdata);
    static void contextStateCallbackInit(pa_context *context, void *userdata);
    static void contextStateCallback(pa_context *c, void *userdata);
 
    void updateDevices();
    void release();
 
    QMap<int, QAudioDevice> m_sinks;
    QMap<int, QAudioDevice> m_sources;
 
    QByteArray m_defaultSink;
    QByteArray m_defaultSource;
 
    mutable QReadWriteLock m_sinkLock;
    mutable QReadWriteLock m_sourceLock;
    mutable QReadWriteLock m_serverLock;
 
    pa_mainloop_api *m_mainLoopApi{};
    std::unique_ptr<pa_threaded_mainloop, QPulseAudioInternal::PaMainLoopDeleter> m_mainLoop;
    PAContextHandle m_context;
    bool m_prepared{};
 
    QString m_serverName;
 };
 
QT_END_NAMESPACE
 
#endif // QPULSEAUDIO_CONTEXTMANAGER_P_H