/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:BSD$

** You may use this file under the terms of the BSD license as follows:

**

**

** $QT_END_LICENSE$

**

#ifndef UTILS_H

#define UTILS_H

#include <QtCore/qglobal.h>

#include <QDebug>

//-----------------------------------------------------------------------------

// Miscellaneous utility functions

//-----------------------------------------------------------------------------

qint64 audioDuration(const QAudioFormat &format, qint64 bytes);

qint64 audioLength(const QAudioFormat &format, qint64 microSeconds);

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);

// Check whether the audio format is PCM

bool isPCM(const QAudioFormat &format);

// Check whether the audio format is signed, little-endian, 16-bit PCM

bool isPCMS16LE(const QAudioFormat &format);

// 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