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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia Plc 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_FORWARD_DECLARE_CLASS(QAudioFormat)
//-----------------------------------------------------------------------------
// 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
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