diff --git a/example/ZXingQtReader.h b/example/ZXingQtReader.h index 629f44423b..b32e37fe43 100644 --- a/example/ZXingQtReader.h +++ b/example/ZXingQtReader.h @@ -16,6 +16,7 @@ #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) #include #else +#include #include #include #endif @@ -333,7 +334,16 @@ class BarcodeReader : public QObject, private ReaderOptions #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) BarcodeReader(QObject* parent = nullptr) : QAbstractVideoFilter(parent) {} #else - BarcodeReader(QObject* parent = nullptr) : QObject(parent) {} + BarcodeReader(QObject* parent = nullptr) : QObject(parent) + { + _pool.setMaxThreadCount(1); + } + ~BarcodeReader() + { + _pool.setMaxThreadCount(0); + _pool.waitForDone(-1); + } + #endif // TODO: find out how to properly expose QFlags to QML @@ -373,10 +383,11 @@ class BarcodeReader : public QObject, private ReaderOptions ZQ_PROPERTY(bool, isPure, setIsPure) // For debugging/development - int runTime = 0; + QAtomicInt runTime = 0; Q_PROPERTY(int runTime MEMBER runTime) public slots: + // Function should be thread safe, as it may be called from a separate thread. ZXingQt::Barcode process(const QVideoFrame& image) { QElapsedTimer t; @@ -403,6 +414,7 @@ public slots: #else private: QVideoSink *_sink = nullptr; + QThreadPool _pool; public: void setVideoSink(QVideoSink* sink) { @@ -413,9 +425,29 @@ public slots: disconnect(_sink, nullptr, this, nullptr); _sink = sink; - connect(_sink, &QVideoSink::videoFrameChanged, this, &BarcodeReader::process); + connect(_sink, &QVideoSink::videoFrameChanged, this, &BarcodeReader::onVideoFrameChanged, Qt::DirectConnection); + } + void onVideoFrameChanged(const QVideoFrame& frame) + { + if (_pool.activeThreadCount() >= _pool.maxThreadCount()) + return; // we are busy => skip the frame + + _pool.start([this, frame](){process(frame);}); } Q_PROPERTY(QVideoSink* videoSink MEMBER _sink WRITE setVideoSink) + Q_PROPERTY(int maxThreadCount READ maxThreadCount WRITE setMaxThreadCount) + int maxThreadCount () const + { + return _pool.maxThreadCount(); + } + void setMaxThreadCount (int maxThreadCount) + { + if (_pool.maxThreadCount() != maxThreadCount) { + _pool.setMaxThreadCount(maxThreadCount); + emit maxThreadCountChanged(); + } + } + Q_SIGNAL void maxThreadCountChanged(); #endif }; pFad - Phonifier reborn

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