avfimagecapture_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 AVFCAMERAIMAGECAPTURE_H
#define AVFCAMERAIMAGECAPTURE_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/qplatformimagecapture_p.h>
#include <QtCore/qsemaphore.h>
 
#include <camera/avfcamerasession_p.h>
 
#include <memory>
#include <queue>
 
#import <AVFoundation/AVFoundation.h>
 
QT_BEGIN_NAMESPACE
 
class AVFImageCapture final : public QPlatformImageCapture
{
    Q_OBJECT
 
public:
    struct CaptureRequest {
        int captureId{};
        std::shared_ptr<QSemaphore> previewReady;
    };
 
    AVFImageCapture(QImageCapture *parent = nullptr);
    ~AVFImageCapture() override;
 
    bool isReadyForCapture() const override;
 
    AVCaptureStillImageOutput *stillImageOutput() const {return m_stillImageOutput;}
 
    int doCapture(const QString &fileName);
    int capture(const QString &fileName) override;
    int captureToBuffer() override;
 
    QImageEncoderSettings imageSettings() const override;
    void setImageSettings(const QImageEncoderSettings &settings) override;
    bool applySettings();
 
    void setCaptureSession(QPlatformMediaCaptureSession *session);
 
private Q_SLOTS:
    void updateCaptureConnection();
    void updateReadyStatus();
    void onNewViewfinderFrame(const QVideoFrame &frame);
    void onCameraChanged();
 
private:
    bool videoCaptureDeviceIsValid() const;
 
    AVFCameraService *m_service = nullptr;
    AVFCameraSession *m_session = nullptr;
    AVFCamera *m_cameraControl = nullptr;
    bool m_ready = false;
    int m_lastCaptureId = 0;
    AVCaptureStillImageOutput *m_stillImageOutput;
    AVCaptureConnection *m_videoConnection = nullptr;
 
    QMutex m_requestsMutex;
    std::queue<CaptureRequest> m_captureRequests;
    QImageEncoderSettings m_settings;
};
 
QT_END_NAMESPACE
 
#endif