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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/private/qtmultimediaglobal_p.h>
#include <QObject>
#include <QtCore/qurl.h>
#include <QWaitCondition>
#include <QMutex>
#include <QQueue>
#include "private/qplatformaudiodecoder_p.h"
#include "qaudiodecoder.h"
#include <dispatch/dispatch.h>
Q_FORWARD_DECLARE_OBJC_CLASS(AVURLAsset);
Q_FORWARD_DECLARE_OBJC_CLASS(AVAssetReader);
Q_FORWARD_DECLARE_OBJC_CLASS(AVAssetReaderTrackOutput);
Q_FORWARD_DECLARE_OBJC_CLASS(AVFResourceReaderDelegate);
QT_BEGIN_NAMESPACE
class AVFAudioDecoder : public QPlatformAudioDecoder
{
Q_OBJECT
struct DecodingContext;
public:
AVFAudioDecoder(QAudioDecoder *parent);
virtual ~AVFAudioDecoder();
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();
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);
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
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