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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WAVEDECODER_H
#define WAVEDECODER_H
#include <QtCore/qiodevice.h>
#include <QtMultimedia/qaudioformat.h>
QT_BEGIN_NAMESPACE
class Q_MULTIMEDIA_EXPORT QWaveDecoder : public QIODevice
{
Q_OBJECT
public:
explicit QWaveDecoder(QIODevice *device, QObject *parent = nullptr);
explicit QWaveDecoder(QIODevice *device, const QAudioFormat &format,
QObject *parent = nullptr);
~QWaveDecoder();
QAudioFormat audioFormat() const;
QIODevice* getDevice();
int duration() const;
static qint64 headerLength();
bool open(QIODevice::OpenMode mode) override;
void close() override;
bool seek(qint64 pos) override;
qint64 pos() const override;
void setIODevice(QIODevice *device);
qint64 size() const override;
bool isSequential() const override;
qint64 bytesAvailable() const override;
Q_SIGNALS:
void formatKnown();
void parsingError();
private Q_SLOTS:
void handleData();
private:
qint64 readData(char *data, qint64 maxlen) override;
qint64 writeData(const char *data, qint64 len) override;
bool writeHeader();
bool writeDataLength();
bool enoughDataAvailable();
bool findChunk(const char *chunkId);
void discardBytes(qint64 numBytes);
void parsingFailed();
enum State {
InitialState,
WaitingForFormatState,
WaitingForDataState
};
struct chunk
{
char id[4];
quint32 size;
};
bool peekChunk(chunk* pChunk, bool handleEndianness = true);
struct RIFFHeader
{
chunk descriptor;
char type[4];
};
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);
bool haveFormat = false;
bool haveHeader = false;
qint64 dataSize = 0;
QIODevice *device = nullptr;
QAudioFormat format;
State state = InitialState;
quint32 junkToSkip = 0;
bool bigEndian = false;
bool byteSwap = false;
};
QT_END_NAMESPACE
#endif // WAVEDECODER_H
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