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author | Tomi Korpipää <tomi.korpipaa@digia.com> | 2013-03-08 13:59:17 +0200 |
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committer | Tomi Korpipää <tomi.korpipaa@digia.com> | 2013-03-08 13:59:17 +0200 |
commit | 7997c3aca1d6e03dd31e145d70a7a40df17e5330 (patch) | |
tree | 4f9d6fad4a81a1d8c3cf290e0d249868826651f9 /examples/datavis3d/spectrum/spectrumapp/utils.h | |
parent | 155a980a8004d48e221fe0a02e741d0fba830611 (diff) |
Initial version of spectrum analyzer example with 3d bars
Diffstat (limited to 'examples/datavis3d/spectrum/spectrumapp/utils.h')
-rw-r--r-- | examples/datavis3d/spectrum/spectrumapp/utils.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/examples/datavis3d/spectrum/spectrumapp/utils.h b/examples/datavis3d/spectrum/spectrumapp/utils.h new file mode 100644 index 00000000..daf5fae8 --- /dev/null +++ b/examples/datavis3d/spectrum/spectrumapp/utils.h @@ -0,0 +1,112 @@ +/**************************************************************************** +** +** 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 |