qffmpegmediacapturesession_p.h

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// Copyright (C) 2016 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 QFFMPEGMEDIACAPTURESESSION_H

#define QFFMPEGMEDIACAPTURESESSION_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 <QtCore/qiodevice.h>

#include <QtCore/qpointer.h>

#include <QtMultimedia/private/qplatformmediacapture_p.h>

#include <QtMultimedia/private/qplatformmediaintegration_p.h>

QT_BEGIN_NAMESPACE

class QFFmpegMediaRecorder;

class QFFmpegImageCapture;

class QVideoFrame;

class QAudioSink;

class QFFmpegAudioInput;

class QAudioBuffer;

class QPlatformVideoSource;

class QPlatformAudioBufferInput;

class QAudioBufferSource;

class QFFmpegMediaCaptureSession : public QPlatformMediaCaptureSession

    Q_OBJECT

public:

    using VideoSources = std::vector<QPointer<QPlatformVideoSource>>;

    QFFmpegMediaCaptureSession();

    ~QFFmpegMediaCaptureSession() override;

    QPlatformCamera *camera() override;

    void setCamera(QPlatformCamera *camera) override;

    QPlatformSurfaceCapture *screenCapture() override;

    void setScreenCapture(QPlatformSurfaceCapture *) override;

    QPlatformSurfaceCapture *windowCapture() override;

    void setWindowCapture(QPlatformSurfaceCapture *) override;

    QPlatformVideoFrameInput *videoFrameInput() override;

    void setVideoFrameInput(QPlatformVideoFrameInput *) override;

    QPlatformImageCapture *imageCapture() override;

    void setImageCapture(QPlatformImageCapture *imageCapture) override;

    QPlatformMediaRecorder *mediaRecorder() override;

    void setMediaRecorder(QPlatformMediaRecorder *recorder) override;

    void setAudioInput(QPlatformAudioInput *input) override;

    QPlatformAudioInput *audioInput() const;

    void setAudioBufferInput(QPlatformAudioBufferInput *input) override;

    void setVideoPreview(QVideoSink *sink) override;

    void setAudioOutput(QPlatformAudioOutput *output) override;

    // A source may emit frames from a backgrund thread before

    // its setActive() is done. We need to setup necessary connections

    // ahead of time as to not miss initial frames. This function

    // should be called by a source right before it initiates

    // the internal stream.

    void onSourceActivating(QPlatformVideoSource &);

    // Called by a source if it fails to go inactive.

    void onSourceActivationFailure(QPlatformVideoSource &);

    QPlatformVideoSource *primaryActiveVideoSource();

    // it might be moved to the base class, but it needs QPlatformAudioInput

    // to be QAudioBufferSource, which might not make sense

    std::vector<QAudioBufferSource *> activeAudioInputs() const;

private Q_SLOTS:

    void updateAudioSink();

    void updateVolume();

    void updatePrimaryActiveVideoSource();

Q_SIGNALS:

    void primaryActiveVideoSourceChanged();

private:

    template<typename VideoSource>

    bool setVideoSource(QPointer<VideoSource> &source, VideoSource *newSource);

    [[nodiscard]] QPlatformVideoSource *primaryVideoSource(QPlatformVideoSource *pendingActiveSource);

    void updateVideoFrameConnection(QPlatformVideoSource *pendingActiveSource);

    QPointer<QPlatformCamera> m_camera;

    QPointer<QPlatformSurfaceCapture> m_screenCapture;

    QPointer<QPlatformSurfaceCapture> m_windowCapture;

    QPointer<QPlatformVideoFrameInput> m_videoFrameInput;

    QPointer<QPlatformVideoSource> m_primaryActiveVideoSource;

    QPointer<QFFmpegAudioInput> m_audioInput;

    QPointer<QPlatformAudioBufferInput> m_audioBufferInput;

    QFFmpegImageCapture *m_imageCapture = nullptr;

    QFFmpegMediaRecorder *m_mediaRecorder = nullptr;

    QPlatformAudioOutput *m_audioOutput = nullptr;

    QVideoSink *m_videoSink = nullptr;

    std::unique_ptr<QAudioSink> m_audioSink;

    QPointer<QIODevice> m_audioIODevice;

    qsizetype m_audioBufferSize = 0;

    struct SourceSinkConnection {

        QPlatformVideoSource *source = nullptr;

        QVideoSink *sink = nullptr;

        QMetaObject::Connection connection;

};

    SourceSinkConnection m_videoSinkConnection;

};

QT_END_NAMESPACE

#endif // QGSTREAMERCAPTURESERVICE_H