QR code feature beta and streamer mode

src/QR-Code-scanner/QrScanThread.cpp

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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.
+
+#include "QrScanThread.h"
+#include <QtGlobal>
+#include <QDebug>
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+extern QImage qt_imageFromVideoFrame(const QVideoFrame &f);
+#endif
+
+QrScanThread::QrScanThread(QObject *parent)
+      : QThread(parent)
+       ,m_running(true)
+{
+}
+
+void QrScanThread::processQImage(const QImage &qimg)
+{
+    try {
+        for (const std::string &code : m_decoder.decode(qimg))
+        {
+            emit decoded(QString::fromStdString(code));
+        }
+    }
+    catch(std::exception &e) {
+        qDebug() << "ERROR: " << e.what();
+        emit notifyError(e.what());
+    }
+}
+
+void QrScanThread::processVideoFrame(const QVideoFrame &frame)
+{
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+    processQImage( qt_imageFromVideoFrame(frame) );
+#else
+    processQImage(frame.image());
+#endif
+}
+
+void QrScanThread::stop()
+{
+    m_running = false;
+    m_waitCondition.wakeOne();
+}
+
+void QrScanThread::addFrame(const QVideoFrame &frame)
+{
+    QMutexLocker locker(&m_mutex);
+    m_queue.append(frame);
+    m_waitCondition.wakeOne();
+}
+
+void QrScanThread::run()
+{
+    QVideoFrame frame;
+    while(m_running) {
+        QMutexLocker locker(&m_mutex);
+        while(m_queue.isEmpty() && m_running)
+            m_waitCondition.wait(&m_mutex);
+        if(!m_queue.isEmpty())
+            processVideoFrame(m_queue.takeFirst());
+    }
+}
+