avfaudiodecoder_p.h

Enable keyboard shortcuts

// Copyright (C) 2021 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 AVFAUDIODECODER_H

#define AVFAUDIODECODER_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/qaudiodecoder.h>

#include <QtMultimedia/private/qplatformaudiodecoder_p.h>

#include <QtMultimedia/private/qtmultimediaglobal_p.h>

#include <QtCore/qmutex.h>

#include <QtCore/qobject.h>

#include <QtCore/qqueue.h>

#include <QtCore/qurl.h>

#include <QtCore/qwaitcondition.h>

#import <dispatch/dispatch.h>

#import <AVFoundation/AVFoundation.h>

@class AVFResourceReaderDelegate;

QT_BEGIN_NAMESPACE

class AVFAudioDecoder final : public QPlatformAudioDecoder

    Q_OBJECT

    struct DecodingContext;

public:

    AVFAudioDecoder(QAudioDecoder *parent);

    ~AVFAudioDecoder() override;

    QUrl source() const override;

    void setSource(const QUrl &fileName) override;

    QIODevice *sourceDevice() const override;

    void setSourceDevice(QIODevice *device) override;

    void start() override;

    void stop() override;

    QAudioFormat audioFormat() const override;

    void setAudioFormat(const QAudioFormat &format) override;

    QAudioBuffer read() override;

private:

    void handleNewAudioBuffer(QAudioBuffer);

    void startReading(QAudioFormat);

    void processInvalidMedia(QAudioDecoder::Error errorCode, const QString& errorString);

    void initAssetReader();

    void onFinished();

    void waitUntilBuffersCounterLessMax();

    void decBuffersCounter(uint val);

    template<typename F>

    void invokeWithDecodingContext(std::weak_ptr<DecodingContext> weakContext, F &&f);

    Q_INVOKABLE void initAssetReaderImpl(AVAssetTrack *track, NSError *error);

private:

    QUrl m_source;

    QIODevice *m_device = nullptr;

    QAudioFormat m_format;

    // Use a separate counter instead of buffers queue size in order to

    // ensure atomic access and also make mutex locking shorter

    std::atomic<int> m_buffersCounter = 0;

    QQueue<QAudioBuffer> m_cachedBuffers;

    AVURLAsset *m_asset = nullptr;

    AVFResourceReaderDelegate *m_readerDelegate = nullptr;

    dispatch_queue_t m_readingQueue;

    dispatch_queue_t m_decodingQueue;

    std::shared_ptr<DecodingContext> m_decodingContext;

    QMutex m_buffersCounterMutex;

    QWaitCondition m_buffersCounterCondition;

};

QT_END_NAMESPACE

#endif // AVFAUDIODECODER_H