1 files changed, 8 insertions, 3 deletions
diff --git a/examples/charts/audio/xyseriesiodevice.h b/examples/charts/audio/xyseriesiodevice.h
index 05daf974..cbbf2271 100644
--- a/examples/charts/audio/xyseriesiodevice.h
+++ b/examples/charts/audio/xyseriesiodevice.h
@@ -31,6 +31,8 @@
 #define XYSERIESIODEVICE_H
 
 #include <QtCore/QIODevice>
+#include <QtCore/QPointF>
+#include <QtCore/QVector>
 #include <QtCharts/QChartGlobal>
 
 QT_CHARTS_BEGIN_NAMESPACE
@@ -43,14 +45,17 @@ class XYSeriesIODevice : public QIODevice
 {
     Q_OBJECT
 public:
-    explicit XYSeriesIODevice(QXYSeries * series, QObject *parent = 0);
+    explicit XYSeriesIODevice(QXYSeries *series, QObject *parent = nullptr);
+
+    static const int sampleCount = 2000;
 
 protected:
-    qint64 readData(char * data, qint64 maxSize);
-    qint64 writeData(const char * data, qint64 maxSize);
+    qint64 readData(char *data, qint64 maxSize) override;
+    qint64 writeData(const char *data, qint64 maxSize) override;
 
 private:
     QXYSeries *m_series;
+    QVector<QPointF> m_buffer;
 };
 
 #endif // XYSERIESIODEVICE_H