qpipewire_audiosource_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_AUDIOSOURCE_P_H

#define QPIPEWIRE_AUDIOSOURCE_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/qaudio_platform_implementation_support_p.h>

#include <QtMultimedia/private/qaudiosystem_p.h>

#include <QtMultimedia/private/qaudiosystem_platform_stream_support_p.h>

#include <QtMultimedia/private/qpipewire_audiostream_p.h>

#include <QtCore/qsemaphore.h>

#include <QtCore/qtclasshelpermacros.h>

QT_BEGIN_NAMESPACE

namespace QtPipeWire {

using namespace QtMultimediaPrivate;

class QPipewireAudioSource;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

// LATER:

// ideally the ringbuffer should fill a buffer that can grow via a worker thread on which we can

// allocate.

struct QPipewireAudioSourceStream final : QPipewireAudioStream, QPlatformAudioSourceStream

    using SourceType = QPipewireAudioSource;

    using SampleFormat = QAudioFormat::SampleFormat;

    QPipewireAudioSourceStream(QAudioDevice, const QAudioFormat &,

                               std::optional<qsizetype> ringbufferSize,

                               QPipewireAudioSource *parent, float volume,

                               std::optional<NativePeriodFrames> nativePeriodFrames);

    Q_DISABLE_COPY_MOVE(QPipewireAudioSourceStream)

    ~QPipewireAudioSourceStream();

    bool open() { return true; }

    bool start(QIODevice *device);

    QIODevice *start();

    bool start(AudioCallback &&);

    void stop(ShutdownPolicy);

    using QPlatformAudioSourceStream::bytesReady;

    using QPlatformAudioSourceStream::deviceIsRingbufferReader;

    using QPlatformAudioSourceStream::processedDuration;

    using QPlatformAudioSourceStream::ringbufferSizeInBytes;

    using QPlatformAudioSourceStream::setVolume;

    void updateStreamIdle(bool idle) override;

private:

    void createStream(QPipewireAudioStream::StreamType);

    std::optional<ObjectSerial> findSourceNodeSerial();

    using QPlatformAudioSourceStream::m_format;

    // QPipewireAudioSourceStream overrides

    void processRingbuffer() noexcept Q_DECL_NONBLOCKING_FUNCTION override;

    void processCallback() noexcept Q_DECL_NONBLOCKING_FUNCTION override;

    void handleDeviceRemoved() override;

    void stateChanged(pw_stream_state old, pw_stream_state state, const char *error) override;

    void finalizeStream() override;

    void disconnectStream();

    QSemaphore m_streamDisconnected;

    // xrun detection

    void xrunOccurred(int /*xrunCount*/) override { m_xrunOccurred.set(); }

    QtPrivate::QAutoResetEvent m_xrunOccurred;

    QMetaObject::Connection m_xrunNotification;

    std::optional<AudioCallback> m_audioCallback;

    QPipewireAudioSource *m_parent;

};

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

class QPipewireAudioSource final

    : public QPlatformAudioSourceImplementationWithCallback<QPipewireAudioSourceStream,

                                                            QPipewireAudioSource>

    using BaseClass = QPlatformAudioSourceImplementationWithCallback<QPipewireAudioSourceStream,

                                                                     QPipewireAudioSource>;

public:

    QPipewireAudioSource(QAudioDevice, const QAudioFormat &, QObject *parent);

    ~QPipewireAudioSource() override;

    void reportXRuns(int);

};

} // namespace QtPipeWire

QT_END_NAMESPACE

#endif