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++ // 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