histogramwidget.h Example File

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#ifndef HISTOGRAMWIDGET_H #define HISTOGRAMWIDGET_H #include <QThread> #include <QVideoFrame> #include <QAudioBuffer> #include <QWidget> class QAudioLevel; class FrameProcessor: public QObject { Q_OBJECT public slots: void processFrame(QVideoFrame frame, int levels); signals: void histogramReady(const QVector<qreal> &histogram); }; class HistogramWidget : public QWidget { Q_OBJECT public: explicit HistogramWidget(QWidget *parent = nullptr); ~HistogramWidget(); void setLevels(int levels) { m_levels = levels; } public slots: void processFrame(const QVideoFrame &frame); void processBuffer(const QAudioBuffer &buffer); void setHistogram(const QVector<qreal> &histogram); protected: void paintEvent(QPaintEvent *event) override; private: QVector<qreal> m_histogram; int m_levels = 128; FrameProcessor m_processor; QThread m_processorThread; bool m_isBusy = false; QVector<QAudioLevel *> m_audioLevels; }; #endif // HISTOGRAMWIDGET_H