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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 Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WAVEDECODER_H
#define WAVEDECODER_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qiodevice.h>
#include <qaudioformat.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Multimedia)
class QWaveDecoder : public QIODevice
{
Q_OBJECT
public:
explicit QWaveDecoder(QIODevice *source, QObject *parent = 0);
~QWaveDecoder();
QAudioFormat audioFormat() const;
int duration() const;
qint64 size() const;
bool isSequential() const;
qint64 bytesAvailable() const;
Q_SIGNALS:
void formatKnown();
void invalidFormat();
private Q_SLOTS:
void handleData();
private:
qint64 readData(char *data, qint64 maxlen);
qint64 writeData(const char *data, qint64 len);
bool enoughDataAvailable();
bool findChunk(const char *chunkId);
void discardBytes(qint64 numBytes);
enum State {
InitialState,
WaitingForFormatState,
WaitingForDataState
};
struct chunk
{
char id[4];
quint32 size;
};
struct RIFFHeader
{
chunk descriptor;
char type[4];
};
struct WAVEHeader
{
chunk descriptor;
quint16 audioFormat;
quint16 numChannels;
quint32 sampleRate;
quint32 byteRate;
quint16 blockAlign;
quint16 bitsPerSample;
};
bool haveFormat;
qint64 dataSize;
qint64 remaining;
QAudioFormat format;
QIODevice *source;
State state;
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // WAVEDECODER_H
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