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/****************************************************************************
**
** 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:
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** - Redistributions of source code must retain the above copyright notice,
**   this list of conditions and the following disclaimer.
** - Redistributions in binary form must reproduce the above copyright notice,
**   this list of conditions and the following disclaimer in the documentation
**   and/or other materials provided with the distribution.
** - Neither the name of Nokia Corporation and its Subsidiary(-ies) nor the
**   names of its contributors may be used to endorse or promote products
**   derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
** POSSIBILITY OF SUCH DAMAGE.
** $QT_END_LICENSE$
**
*****************************************************************************/

#ifndef UTILS_H
#define UTILS_H

#include <QtCore/qglobal.h>
#include <QDebug>

QT_BEGIN_NAMESPACE
class QAudioFormat;
QT_END_NAMESPACE

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