qgstreamerimagecapture_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 QGSTREAMERIMAGECAPTURECONTROL_H

#define QGSTREAMERIMAGECAPTURECONTROL_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 <QtMultimedia/private/qmultimediautils_p.h>

#include <QtCore/qmutex.h>

#include <QtCore/qqueue.h>

#include <QtCore/private/qexpected_p.h>

#include <QtConcurrent/QtConcurrentRun>

#include <common/qgst_p.h>

#include <common/qgstreamerbufferprobe_p.h>

#include <mediacapture/qgstreamermediacapturesession_p.h>

#include <gst/video/video.h>

#include <map>

QT_BEGIN_NAMESPACE

class QGstreamerImageCapture : public QPlatformImageCapture, private QGstreamerBufferProbe

    Q_OBJECT

public:

    static q23::expected<QPlatformImageCapture *, QString> create(QImageCapture *parent);

    ~QGstreamerImageCapture() override;

    bool isReadyForCapture() const override;

    int capture(const QString &fileName) override;

    int captureToBuffer() override;

    QImageEncoderSettings imageSettings() const override;

    void setImageSettings(const QImageEncoderSettings &settings) override;

    bool probeBuffer(GstBuffer *buffer) override;

    void setCaptureSession(QPlatformMediaCaptureSession *session);

    QGstElement gstElement() const { return bin; }

    void setMetaData(const QMediaMetaData &m) override;

public Q_SLOTS:

    void cameraActiveChanged(bool active);

    void onCameraChanged();

private:

    QGstreamerImageCapture(QImageCapture *parent);

    void setResolution(const QSize &resolution);

    int doCapture(QString fileName);

    void saveBufferToFile(QGstBufferHandle, QString filename, int id);

    void convertBufferToImage(const QMutexLocker<QRecursiveMutex> &, QGstBufferHandle, QGstCaps,

                              QMediaMetaData, int id);

    mutable QRecursiveMutex m_mutex; // guard all elements accessed from gstreamer / worker threads

    QGstreamerMediaCaptureSession *m_session = nullptr;

    int m_lastId = 0;

    QImageEncoderSettings m_settings;

    struct PendingImage {

        int id;

        QString filename;

};

    QQueue<PendingImage> pendingImages;

    QGstBin bin;

    QGstElement queue;

    QGstElement filter;

    QGstElement videoConvert;

    QGstElement encoder;

    QGstElement muxer;

    QGstElement sink;

    QGstPad videoSrcPad;

    std::atomic_bool m_captureNextBuffer{};

    bool cameraActive = false;

    QMutex m_pendingFuturesMutex;

    std::map<int, QFuture<void>> m_pendingFutures;

    std::atomic<int> m_futureIDAllocator{};

    template <typename Functor>

    void invokeDeferred(Functor &&fn);

    template <typename Functor>

    void runInThreadPool(Functor);

};

QT_END_NAMESPACE

#endif // QGSTREAMERCAPTURECORNTROL_H