qqnxsndaudiosource_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

//

//  W A R N I N G

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

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#ifndef QQNXSNDAUDIOSOURCE_P_H

#define QQNXSNDAUDIOSOURCE_P_H

#include <alsa/asoundlib.h>

#include <QtCore/qiodevice.h>

#include <QtCore/qthread.h>

#include <QtCore/qtclasshelpermacros.h>

#include <QtMultimedia/qaudio.h>

#include <QtMultimedia/qaudiodevice.h>

#include <QtMultimedia/private/qaudiosystem_p.h>

#include <QtMultimedia/private/qaudiosystem_platform_stream_support_p.h>

#include <QtMultimedia/private/qaudio_platform_implementation_support_p.h>

#include "qqnxsndhelpers_p.h"

#include <atomic>

#include <memory>

#include <optional>

QT_BEGIN_NAMESPACE

class QQnxSndAudioSource;

struct QQnxSndAudioSourceStream final

    : std::enable_shared_from_this<QQnxSndAudioSourceStream>,

      QtMultimediaPrivate::QPlatformAudioSourceStream

    using SourceType = QQnxSndAudioSource;

    using AudioCallback = QtMultimediaPrivate::QPlatformAudioSourceStream::AudioCallback;

    using ShutdownPolicy = QtMultimediaPrivate::QPlatformAudioIOStream::ShutdownPolicy;

    using NativePeriodFrames = QtMultimediaPrivate::NativePeriodFrames;

    QQnxSndAudioSourceStream(QAudioDevice, const QAudioFormat &,

                             std::optional<qsizetype> ringbufferSize, QQnxSndAudioSource *parent,

                             float volume, std::optional<NativePeriodFrames> nativePeriodFrames);

    Q_DISABLE_COPY_MOVE(QQnxSndAudioSourceStream)

    ~QQnxSndAudioSourceStream();

    using QtMultimediaPrivate::QPlatformAudioSourceStream::bytesReady;

    using QtMultimediaPrivate::QPlatformAudioSourceStream::deviceIsRingbufferReader;

    using QtMultimediaPrivate::QPlatformAudioSourceStream::processedDuration;

    using QtMultimediaPrivate::QPlatformAudioSourceStream::ringbufferSizeInBytes;

    using QtMultimediaPrivate::QPlatformAudioSourceStream::setVolume;

    bool open();

    bool start(QIODevice *);

    QIODevice *start();

    bool start(AudioCallback);

    void suspend();

    void resume();

    void stop(ShutdownPolicy);

    void updateStreamIdle(bool) override;

private:

    bool openPcmDevice();

    int recoverFromXrun(int err);

    void startWorker();

    void joinWorkerThread();

    void runProcessLoop();

    bool processOnePeriod();

    void handleSndPcmError(int err = 0);

    void closePcmDevice();

    snd_pcm_t *m_handle = nullptr;

    snd_pcm_uframes_t m_periodFrames = 0;

    // Device-native sample format chosen at open (best-native + convert); the

    // host buffer read from io-snd is in this format, converted to the

    // application format by the base-class process()/runAudioCallback helpers.

    QAudioHelperInternal::NativeSampleFormat m_nativeFormat =

            QAudioHelperInternal::NativeSampleFormat::int16_t;

    std::atomic_bool m_suspended = false;

    std::unique_ptr<QThread> m_workerThread;

    // Wakes the worker out of poll() for stop/suspend/resume (see runProcessLoop).

    QnxSndHelpers::WakePipe m_wakePipe;

    std::optional<AudioCallback> m_audioCallback = std::nullopt;

    // See QQnxSndAudioSinkStream::m_parent: atomic to bridge worker reads

    // and app-thread writes safely.

    std::atomic<QQnxSndAudioSource *> m_parent{ nullptr };

};

class QQnxSndAudioSource final

    : public QtMultimediaPrivate::QPlatformAudioSourceImplementationWithCallback<

              QQnxSndAudioSourceStream, QQnxSndAudioSource>

    using BaseClass = QtMultimediaPrivate::QPlatformAudioSourceImplementationWithCallback<

            QQnxSndAudioSourceStream, QQnxSndAudioSource>;

public:

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

    ~QQnxSndAudioSource() override;

};

QT_END_NAMESPACE

#endif // QQNXSNDAUDIOSOURCE_P_H