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-rw-r--r--demos/spectrum/app/wavfile.cpp247
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diff --git a/demos/spectrum/app/wavfile.cpp b/demos/spectrum/app/wavfile.cpp
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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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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;
+ DATAHeader data;
+};
+
+static const int HeaderLength = sizeof(CombinedHeader);
+
+
+WavFile::WavFile(const QAudioFormat &format, qint64 dataLength)
+ : m_format(format)
+ , m_dataLength(dataLength)
+{
+
+}
+
+bool WavFile::readHeader(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.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));
+
+ 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 WavFile::writeHeader(QIODevice &device)
+{
+ CombinedHeader header;
+
+ memset(&header, 0, HeaderLength);
+
+ // 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 + HeaderLength - 8),
+ 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(&header.data.descriptor.id[0], "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& WavFile::format() const
+{
+ return m_format;
+}
+
+qint64 WavFile::dataLength() const
+{
+ return m_dataLength;
+}
+
+qint64 WavFile::headerLength()
+{
+ return HeaderLength;
+}
+
+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;
+}
+
+#include <QFile>
+#include <QTextStream>
+
+qint64 WavFile::readData(QIODevice &device, QByteArray &buffer,
+ QAudioFormat outputFormat)
+{
+ if (QAudioFormat() == outputFormat)
+ outputFormat = m_format;
+
+ qint64 result = 0;
+
+ QFile file("wav.txt");
+ file.open(QIODevice::WriteOnly | QIODevice::Text);
+ QTextStream stream;
+ stream.setDevice(&file);
+
+ if (isPCMS16LE(outputFormat) && isPCMS16LE(m_format)) {
+ QVector<char> inputSample(2 * m_format.channels());
+
+ qint16 *output = reinterpret_cast<qint16*>(buffer.data());
+
+ while (result < buffer.size()) {
+ 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;
+ }
+ } else {
+ break;
+ }
+ }
+ }
+ return result;
+}
+
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