mirror of https://github.com/qt/qtdatavis3d.git
130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the QtDataVis3D module.
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**
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** Licensees holding valid Qt Enterprise licenses may use this file in
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** accordance with the Qt Enterprise License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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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 "utils.h"
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#include "wavfile.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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WavFile::WavFile(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 WavFile::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 &WavFile::fileFormat() const
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{
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return m_fileFormat;
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}
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qint64 WavFile::headerLength() const
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{
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return m_headerLength;
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}
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bool WavFile::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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