127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/*
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* Kaidan - A user-friendly XMPP client for every device!
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*
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* Copyright (C) 2016-2021 Kaidan developers and contributors
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* (see the LICENSE file for a full list of copyright authors)
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*
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* Kaidan is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* In addition, as a special exception, the author of Kaidan gives
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* permission to link the code of its release with the OpenSSL
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* project's "OpenSSL" library (or with modified versions of it that
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* use the same license as the "OpenSSL" library), and distribute the
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* linked executables. You must obey the GNU General Public License in
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* all respects for all of the code used other than "OpenSSL". If you
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* modify this file, you may extend this exception to your version of
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* the file, but you are not obligated to do so. If you do not wish to
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* do so, delete this exception statement from your version.
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*
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* Kaidan is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Kaidan. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <QObject>
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#include <QAbstractVideoFilter>
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#include <QFuture>
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#include "QrCodeDecoder.h"
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#include "QrCodeVideoFrame.h"
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/**
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* video filter to be registered in C++, instantiated and attached in QML
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*/
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class QrCodeScannerFilter : public QAbstractVideoFilter
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{
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friend class QrCodeScannerFilterRunnable;
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Q_OBJECT
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public:
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/**
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* Instantiates a QR code scanner filter.
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*
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* @param parent parent object
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*/
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explicit QrCodeScannerFilter(QObject *parent = nullptr);
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~QrCodeScannerFilter() override;
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/**
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* @return decoder for decoding a video frame
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*/
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QrCodeDecoder *decoder();
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QVideoFilterRunnable *createFilterRunnable() override;
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/**
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* Sets the video frame format of the QML Camera object to our default format
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*
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* @param qmlCamera Camera object from QML
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*/
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Q_INVOKABLE void setCameraDefaultVideoFormat(QObject *qmlCamera);
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signals:
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/**
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* Emitted when the scanning of an image did not succeed, i.e. no valid QR code was found.
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*/
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void scanningFailed();
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/**
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* Emitted when the scanning of an image succeeded, i.e. a valid QR code was found and decoded.
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*
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* @param result decoded content of the QR code
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*/
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void scanningSucceeded(const QString& result);
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/**
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* Emitted when a video frame with an unsupported format is received.
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*
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* @param format format of the video frame which is not supported
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*/
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void unsupportedFormatReceived(const QString& format);
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private:
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QrCodeDecoder *m_decoder;
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/**
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* frame of the video which may contain a QR code
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*/
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QrCodeVideoFrame m_frame;
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QFuture<void> m_processThread;
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};
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/**
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* runnable which is created everytime the filter gets a new frame
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*/
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class QrCodeScannerFilterRunnable : public QObject, public QVideoFilterRunnable
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{
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Q_OBJECT
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public:
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explicit QrCodeScannerFilterRunnable(QrCodeScannerFilter *m_filter);
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/**
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* Runs the decoding in a new thread whenever a new frame is taken by the camera.
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*/
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QVideoFrame run(QVideoFrame *input, const QVideoSurfaceFormat &surfaceFormat, RunFlags flags) override;
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/**
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* Converts a given frame, which may contain a QR code, to an image and then tries to decode it.
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*
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* @param videoFrame frame to be converted and which may contain a QR code to be decoded
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* @param filter filter of the current execution
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*/
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void processVideoFrameProbed(QrCodeVideoFrame videoFrame, QrCodeScannerFilter *filter);
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private:
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QrCodeScannerFilter *m_filter;
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};
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