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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/qendian.h>
#include "wavheader.h"
struct chunk
{
char id[4];
quint32 size;
};
struct RIFFHeader
{
chunk descriptor; // "RIFF"
char type[4]; // "WAVE"
};
struct WAVEHeader
{
chunk descriptor;
quint16 audioFormat;
quint16 numChannels;
quint32 sampleRate;
quint32 byteRate;
quint16 blockAlign;
quint16 bitsPerSample;
};
struct DATAHeader
{
chunk descriptor;
};
struct CombinedHeader
{
RIFFHeader riff;
WAVEHeader wave;
DATAHeader data;
};
static const int HeaderLength = sizeof(CombinedHeader);
WavHeader::WavHeader(const QAudioFormat &format, qint64 dataLength)
: m_format(format)
, m_dataLength(dataLength)
{
}
bool WavHeader::read(QIODevice &device)
{
bool result = true;
if (!device.isSequential())
result = device.seek(0);
// else, assume that current position is the start of the header
if (result) {
CombinedHeader header;
result = (device.read(reinterpret_cast<char *>(&header), HeaderLength) == HeaderLength);
if (result) {
if ((memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0
|| memcmp(&header.riff.descriptor.id, "RIFX", 4) == 0)
&& memcmp(&header.riff.type, "WAVE", 4) == 0
&& memcmp(&header.wave.descriptor.id, "fmt ", 4) == 0
&& header.wave.audioFormat == 1 // PCM
) {
if (memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0)
m_format.setByteOrder(QAudioFormat::LittleEndian);
else
m_format.setByteOrder(QAudioFormat::BigEndian);
m_format.setChannelCount(qFromLittleEndian<quint16>(header.wave.numChannels));
m_format.setCodec("audio/pcm");
m_format.setSampleRate(qFromLittleEndian<quint32>(header.wave.sampleRate));
m_format.setSampleSize(qFromLittleEndian<quint16>(header.wave.bitsPerSample));
switch(header.wave.bitsPerSample) {
case 8:
m_format.setSampleType(QAudioFormat::UnSignedInt);
break;
case 16:
m_format.setSampleType(QAudioFormat::SignedInt);
break;
default:
result = false;
}
m_dataLength = device.size() - HeaderLength;
} else {
result = false;
}
}
}
return result;
}
bool WavHeader::write(QIODevice &device)
{
CombinedHeader header;
memset(&header, 0, HeaderLength);
// RIFF header
if (m_format.byteOrder() == QAudioFormat::LittleEndian)
memcpy(header.riff.descriptor.id,"RIFF",4);
else
memcpy(header.riff.descriptor.id,"RIFX",4);
qToLittleEndian<quint32>(quint32(m_dataLength + HeaderLength - 8),
reinterpret_cast<unsigned char*>(&header.riff.descriptor.size));
memcpy(header.riff.type, "WAVE",4);
// WAVE header
memcpy(header.wave.descriptor.id,"fmt ",4);
qToLittleEndian<quint32>(quint32(16),
reinterpret_cast<unsigned char*>(&header.wave.descriptor.size));
qToLittleEndian<quint16>(quint16(1),
reinterpret_cast<unsigned char*>(&header.wave.audioFormat));
qToLittleEndian<quint16>(quint16(m_format.channelCount()),
reinterpret_cast<unsigned char*>(&header.wave.numChannels));
qToLittleEndian<quint32>(quint32(m_format.sampleRate()),
reinterpret_cast<unsigned char*>(&header.wave.sampleRate));
qToLittleEndian<quint32>(quint32(m_format.sampleRate() * m_format.channelCount() * m_format.sampleSize() / 8),
reinterpret_cast<unsigned char*>(&header.wave.byteRate));
qToLittleEndian<quint16>(quint16(m_format.channelCount() * m_format.sampleSize() / 8),
reinterpret_cast<unsigned char*>(&header.wave.blockAlign));
qToLittleEndian<quint16>(quint16(m_format.sampleSize()),
reinterpret_cast<unsigned char*>(&header.wave.bitsPerSample));
// DATA header
memcpy(header.data.descriptor.id,"data",4);
qToLittleEndian<quint32>(quint32(m_dataLength),
reinterpret_cast<unsigned char*>(&header.data.descriptor.size));
return (device.write(reinterpret_cast<const char *>(&header), HeaderLength) == HeaderLength);
}
const QAudioFormat& WavHeader::format() const
{
return m_format;
}
qint64 WavHeader::dataLength() const
{
return m_dataLength;
}
qint64 WavHeader::headerLength()
{
return HeaderLength;
}
bool WavHeader::writeDataLength(QIODevice &device, qint64 dataLength)
{
bool result = false;
if (!device.isSequential()) {
device.seek(40);
unsigned char dataLengthLE[4];
qToLittleEndian<quint32>(quint32(dataLength), dataLengthLE);
result = (device.write(reinterpret_cast<const char *>(dataLengthLE), 4) == 4);
}
return result;
}
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