QR code feature beta and streamer mode

src/QR-Code-scanner/QrScanThread.h

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+// Copyright (c) 2014-2019, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef _QRSCANTHREAD_H_
+#define _QRSCANTHREAD_H_
+
+#include <QThread>
+#include <QMutex>
+#include <QWaitCondition>
+#include <QEvent>
+#include <QVideoFrame>
+#include <QCamera>
+
+#include "Decoder.h"
+
+class QrScanThread : public QThread
+{
+    Q_OBJECT
+
+public:
+    QrScanThread(QObject *parent = Q_NULLPTR);
+    void addFrame(const QVideoFrame &frame);
+    virtual void stop();
+
+Q_SIGNALS:
+    void decoded(const QString &data);
+    void notifyError(const QString &error, bool warning = false);
+
+protected:
+    virtual void run();
+    void processVideoFrame(const QVideoFrame &);
+    void processQImage(const QImage &);
+
+private:
+    QrDecoder m_decoder;
+    bool m_running;
+    QMutex m_mutex;
+    QWaitCondition m_waitCondition;
+    QList<QVideoFrame> m_queue;
+};
+#endif