qffmpegencodinginitializer_p.h

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// Copyright (C) 2024 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 QENCODINGINITIALIZER_P_H

#define QENCODINGINITIALIZER_P_H

#include "qobject.h"

#include <QtMultimedia/private/qmediainputencoderinterface_p.h>

#include <unordered_set>

#include <vector>

//

//  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.

//

QT_BEGIN_NAMESPACE

class QFFmpegAudioInput;

class QPlatformVideoSource;

class QPlatformAudioBufferInput;

class QAudioBufferSource;

class QMediaInputEncoderInterface;

namespace QFFmpeg {

class RecordingEngine;

// Initializes RecordingEngine with audio and video sources, potentially lazily

// upon first frame arrival if video frame format is not pre-determined.

class EncodingInitializer : public QObject, private QMediaInputEncoderInterface

public:

    EncodingInitializer(RecordingEngine &engine);

    ~EncodingInitializer() override;

    bool start(const std::vector<QAudioBufferSource *> &audioSources,

               const std::vector<QPlatformVideoSource *> &videoSources);

private:

    void addAudioBufferInput(QPlatformAudioBufferInput *input);

    void addPendingAudioBufferInput(QPlatformAudioBufferInput *input);

    void addVideoSource(QPlatformVideoSource *source);

    void addPendingVideoSource(QPlatformVideoSource *source);

    void addPendingSource(QObject *source);

    bool tryStartRecordingEngine();

private:

    void emitStreamInitializationError(QString error);

    template <typename F>

    void erasePendingSource(QObject *source, F &&functionOrError, bool destroyed = false);

    bool canPushFrame() const override;

private:

    RecordingEngine &m_recordingEngine;

    std::unordered_set<QObject *> m_pendingSources;

};

} // namespace QFFmpeg

QT_END_NAMESPACE

#endif // QENCODINGINITIALIZER_P_H