demos/spectrum/app/wavfile.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 06 Jul 2010 15:10:48 +0300
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permissions -rw-r--r--
Revision: 201025 Kit: 2010127
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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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 met:
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** - Redistributions of source code must retain the above copyright notice,
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**   this list of conditions and the following disclaimer.
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** - Redistributions in binary form must reproduce the above copyright notice,
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**   this list of conditions and the following disclaimer in the documentation
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**   and/or other materials provided with the distribution.
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** - Neither the name of Nokia Corporation and its Subsidiary(-ies) nor the
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**   names of its contributors may be used to endorse or promote products
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**   derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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** POSSIBILITY OF SUCH DAMAGE.
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** $QT_END_LICENSE$
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**
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*****************************************************************************/
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#ifndef WAVFILE_H
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#define WAVFILE_H
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#include <QtCore/qobject.h>
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#include <QtCore/qfile.h>
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#include <QtMultimedia/qaudioformat.h>
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/**
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 * Helper class for reading WAV files
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 *
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 * See https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
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 */
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class WavFile
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{
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public:
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    WavFile(const QAudioFormat &format = QAudioFormat(),
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              qint64 dataLength = 0);
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    // Reads WAV header and seeks to start of data
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    bool readHeader(QIODevice &device);
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    // Writes WAV header
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    bool writeHeader(QIODevice &device);
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    // Read PCM data
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    qint64 readData(QIODevice &device, QByteArray &buffer,
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                    QAudioFormat outputFormat = QAudioFormat());
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    const QAudioFormat& format() const;
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    qint64 dataLength() const;
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    static qint64 headerLength();
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    static bool writeDataLength(QIODevice &device, qint64 dataLength);
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private:
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    QAudioFormat m_format;
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    qint64 m_dataLength;
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};
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#endif
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