112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef WAVEUTILS_H
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#define WAVEUTILS_H
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#include <QtCore/qglobal.h>
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#include <QDebug>
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QT_FORWARD_DECLARE_CLASS(QAudioFormat)
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//-----------------------------------------------------------------------------
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// Miscellaneous utility functions
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//-----------------------------------------------------------------------------
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qint64 audioDuration(const QAudioFormat &format, qint64 bytes);
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qint64 audioLength(const QAudioFormat &format, qint64 microSeconds);
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QString formatToString(const QAudioFormat &format);
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qreal nyquistFrequency(const QAudioFormat &format);
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// Scale PCM value to [-1.0, 1.0]
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qreal pcmToReal(qint16 pcm);
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// Scale real value in [-1.0, 1.0] to PCM
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qint16 realToPcm(qreal real);
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// Check whether the audio format is PCM
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bool isPCM(const QAudioFormat &format);
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// Check whether the audio format is signed, little-endian, 16-bit PCM
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bool isPCMS16LE(const QAudioFormat &format);
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// Compile-time calculation of powers of two
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template<int N> class PowerOfTwo
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{ public: static const int Result = PowerOfTwo<N-1>::Result * 2; };
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template<> class PowerOfTwo<0>
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{ public: static const int Result = 1; };
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//-----------------------------------------------------------------------------
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// Debug output
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//-----------------------------------------------------------------------------
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class NullDebug
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{
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public:
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template <typename T>
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NullDebug& operator<<(const T&) { return *this; }
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};
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inline NullDebug nullDebug() { return NullDebug(); }
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#ifdef LOG_ENGINE
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# define ENGINE_DEBUG qDebug()
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#else
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# define ENGINE_DEBUG nullDebug()
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#endif
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#ifdef LOG_SPECTRUMANALYSER
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# define SPECTRUMANALYSER_DEBUG qDebug()
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#else
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# define SPECTRUMANALYSER_DEBUG nullDebug()
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#endif
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#ifdef LOG_WAVEFORM
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# define WAVEFORM_DEBUG qDebug()
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#else
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# define WAVEFORM_DEBUG nullDebug()
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#endif
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#endif // WAVEUTILS_H
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