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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** 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 Nokia Corporation 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."
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/qendian.h>
#include <QVector>
#include <QDebug>
#include "utils.h"
#include "wavfile.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;
};
WavFile::WavFile(const QAudioFormat &format, qint64 dataLength)
: m_format(format)
, m_dataLength(dataLength)
, m_dataPosition(0)
{
}
bool WavFile::readHeader(QIODevice &device)
{
if (!device.isSequential()) {
if (!device.seek(0))
return false;
// XXX: else, assume that current position is the start of the header
}
CombinedHeader header;
if (device.read(reinterpret_cast<char *>(&header), sizeof(CombinedHeader)) != sizeof(CombinedHeader))
return false;
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 || header.wave.audioFormat == 0)) {
// Read off remaining header information
DATAHeader dataHeader;
if (qFromLittleEndian<quint32>(header.wave.descriptor.size) > sizeof(WAVEHeader)) {
// Extended data available
quint16 extraFormatBytes;
if (device.peek((char*)&extraFormatBytes, sizeof(quint16)) != sizeof(quint16))
return false;
const qint64 throwAwayBytes = sizeof(quint16) + qFromLittleEndian<quint16>(extraFormatBytes);
if (device.read(throwAwayBytes).size() != throwAwayBytes)
return false;
}
if (device.read((char*)&dataHeader, sizeof(DATAHeader)) != sizeof(DATAHeader))
return false;
// Establish format
if (memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0)
m_format.setByteOrder(QAudioFormat::LittleEndian);
else
m_format.setByteOrder(QAudioFormat::BigEndian);
int bps = qFromLittleEndian<quint16>(header.wave.bitsPerSample);
m_format.setChannels(qFromLittleEndian<quint16>(header.wave.numChannels));
m_format.setCodec("audio/pcm");
m_format.setFrequency(qFromLittleEndian<quint32>(header.wave.sampleRate));
m_format.setSampleSize(qFromLittleEndian<quint16>(header.wave.bitsPerSample));
m_format.setSampleType(bps == 8 ? QAudioFormat::UnSignedInt : QAudioFormat::SignedInt);
m_dataLength = qFromLittleEndian<quint32>(dataHeader.descriptor.size);
m_dataPosition = 0;
}
return true;
}
bool WavFile::writeHeader(QIODevice &device)
{
CombinedHeader header;
DATAHeader dataHeader;
memset(&header, 0, sizeof(CombinedHeader));
// RIFF header
if (m_format.byteOrder() == QAudioFormat::LittleEndian)
strncpy(&header.riff.descriptor.id[0], "RIFF", 4);
else
strncpy(&header.riff.descriptor.id[0], "RIFX", 4);
qToLittleEndian<quint32>(quint32(m_dataLength + sizeof(CombinedHeader) + sizeof(DATAHeader) - sizeof(chunk)),
reinterpret_cast<unsigned char*>(&header.riff.descriptor.size));
strncpy(&header.riff.type[0], "WAVE", 4);
// WAVE header
strncpy(&header.wave.descriptor.id[0], "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.channels()),
reinterpret_cast<unsigned char*>(&header.wave.numChannels));
qToLittleEndian<quint32>(quint32(m_format.frequency()),
reinterpret_cast<unsigned char*>(&header.wave.sampleRate));
qToLittleEndian<quint32>(quint32(m_format.frequency() * m_format.channels() * m_format.sampleSize() / 8),
reinterpret_cast<unsigned char*>(&header.wave.byteRate));
qToLittleEndian<quint16>(quint16(m_format.channels() * 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
strncpy(dataHeader.descriptor.id, "data", 4);
qToLittleEndian<quint32>(quint32(m_dataLength),
reinterpret_cast<unsigned char*>(&dataHeader.descriptor.size));
return device.write(reinterpret_cast<const char *>(&header), sizeof(CombinedHeader)) == sizeof(CombinedHeader)
&& device.write(reinterpret_cast<const char*>(&dataHeader), sizeof(DATAHeader)) == sizeof(DATAHeader);
}
const QAudioFormat& WavFile::format() const
{
return m_format;
}
qint64 WavFile::dataLength() const
{
return m_dataLength;
}
qint64 WavFile::headerLength()
{
return sizeof(CombinedHeader);
}
bool WavFile::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;
}
qint64 WavFile::readData(QIODevice &device, QByteArray &buffer,
QAudioFormat outputFormat)
{
// Sanity checks
if (!outputFormat.isValid())
outputFormat = m_format;
if (!isPCMS16LE(outputFormat) || !isPCMS16LE(m_format))
return 0;
if (m_dataPosition == m_dataLength)
return 0;
// Process
qint64 result = 0;
const int frameSize = 2 * m_format.channels(); // 16 bit samples
QVector<char> inputSample(frameSize);
qint16 *output = reinterpret_cast<qint16*>(buffer.data());
while (result < buffer.size()) {
if (m_dataPosition == m_dataLength)
break;
// XXX only working with particular alignments
if (device.read(inputSample.data(), inputSample.count())) {
int inputIdx = 0;
for (int outputIdx = 0; outputIdx < outputFormat.channels(); ++outputIdx) {
const qint16* input = reinterpret_cast<const qint16*>(inputSample.data() + 2 * inputIdx);
*output++ = qFromLittleEndian<qint16>(*input);
result += 2;
if (inputIdx < m_format.channels())
++inputIdx;
}
m_dataPosition += frameSize;
} else {
break;
}
}
return result;
}
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