1 files changed, 79 insertions, 0 deletions
diff --git a/examples/multimedia/spectrum/utils.h b/examples/multimedia/spectrum/utils.h
new file mode 100644
index 000000000..da0711c66
--- /dev/null
+++ b/examples/multimedia/spectrum/utils.h
@@ -0,0 +1,79 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef UTILS_H
+#define UTILS_H
+
+#include <QDebug>
+#include <QtGlobal>
+
+QT_FORWARD_DECLARE_CLASS(QAudioFormat)
+
+//-----------------------------------------------------------------------------
+// Miscellaneous utility functions
+//-----------------------------------------------------------------------------
+
+QString formatToString(const QAudioFormat &format);
+
+qreal nyquistFrequency(const QAudioFormat &format);
+
+// Scale PCM value to [-1.0, 1.0]
+qreal pcmToReal(qint16 pcm);
+
+// Scale real value in [-1.0, 1.0] to PCM
+qint16 realToPcm(qreal real);
+
+// Compile-time calculation of powers of two
+
+template<int N>
+class PowerOfTwo
+{
+public:
+    static const int Result = PowerOfTwo<N - 1>::Result * 2;
+};
+
+template<>
+class PowerOfTwo<0>
+{
+public:
+    static const int Result = 1;
+};
+
+//-----------------------------------------------------------------------------
+// Debug output
+//-----------------------------------------------------------------------------
+
+class NullDebug
+{
+public:
+    template<typename T>
+    NullDebug &operator<<(const T &)
+    {
+        return *this;
+    }
+};
+
+inline NullDebug nullDebug()
+{
+    return NullDebug();
+}
+
+#ifdef LOG_ENGINE
+#    define ENGINE_DEBUG qDebug()
+#else
+#    define ENGINE_DEBUG nullDebug()
+#endif
+
+#ifdef LOG_SPECTRUMANALYSER
+#    define SPECTRUMANALYSER_DEBUG qDebug()
+#else
+#    define SPECTRUMANALYSER_DEBUG nullDebug()
+#endif
+
+#ifdef LOG_WAVEFORM
+#    define WAVEFORM_DEBUG qDebug()
+#else
+#    define WAVEFORM_DEBUG nullDebug()
+#endif
+
+#endif // UTILS_H