151 lines
5.0 KiB
C++
151 lines
5.0 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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#include <qendian.h>
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#include <QVector>
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#include <QDebug>
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#include "WaveFile.h"
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struct chunk
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{
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char id[4];
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quint32 size;
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};
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struct RIFFHeader
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{
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chunk descriptor; // "RIFF"
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char type[4]; // "WAVE"
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};
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struct WAVEHeader
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{
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chunk descriptor;
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quint16 audioFormat;
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quint16 numChannels;
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quint32 sampleRate;
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quint32 byteRate;
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quint16 blockAlign;
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quint16 bitsPerSample;
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};
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struct DATAHeader
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{
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chunk descriptor;
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};
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struct CombinedHeader
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{
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RIFFHeader riff;
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WAVEHeader wave;
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};
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WaveFile::WaveFile(QObject *parent)
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: QFile(parent)
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, m_headerLength(0)
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{
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}
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bool WaveFile::open(const QString &fileName)
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{
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close();
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setFileName(fileName);
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return QFile::open(QIODevice::ReadOnly) && readHeader();
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}
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const QAudioFormat &WaveFile::fileFormat() const
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{
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return m_fileFormat;
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}
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qint64 WaveFile::headerLength() const
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{
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return m_headerLength;
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}
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bool WaveFile::readHeader()
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{
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seek(0);
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CombinedHeader header;
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bool result = read(reinterpret_cast<char *>(&header), sizeof(CombinedHeader)) == sizeof(CombinedHeader);
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if (result) {
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if ((memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0
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|| memcmp(&header.riff.descriptor.id, "RIFX", 4) == 0)
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&& memcmp(&header.riff.type, "WAVE", 4) == 0
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&& memcmp(&header.wave.descriptor.id, "fmt ", 4) == 0
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&& (header.wave.audioFormat == 1 || header.wave.audioFormat == 0)) {
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// Read off remaining header information
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DATAHeader dataHeader;
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if (qFromLittleEndian<quint32>(header.wave.descriptor.size) > sizeof(WAVEHeader)) {
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// Extended data available
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quint16 extraFormatBytes;
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if (peek((char*)&extraFormatBytes, sizeof(quint16)) != sizeof(quint16))
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return false;
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const qint64 throwAwayBytes = sizeof(quint16) + qFromLittleEndian<quint16>(extraFormatBytes);
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if (read(throwAwayBytes).size() != throwAwayBytes)
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return false;
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}
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if (read((char*)&dataHeader, sizeof(DATAHeader)) != sizeof(DATAHeader))
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return false;
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// Establish format
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if (memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0)
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m_fileFormat.setByteOrder(QAudioFormat::LittleEndian);
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else
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m_fileFormat.setByteOrder(QAudioFormat::BigEndian);
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int bps = qFromLittleEndian<quint16>(header.wave.bitsPerSample);
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m_fileFormat.setChannelCount(qFromLittleEndian<quint16>(header.wave.numChannels));
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m_fileFormat.setCodec("audio/pcm");
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m_fileFormat.setSampleRate(qFromLittleEndian<quint32>(header.wave.sampleRate));
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m_fileFormat.setSampleSize(qFromLittleEndian<quint16>(header.wave.bitsPerSample));
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m_fileFormat.setSampleType(bps == 8 ? QAudioFormat::UnSignedInt : QAudioFormat::SignedInt);
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} else {
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result = false;
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}
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}
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m_headerLength = pos();
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return result;
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}
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