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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 Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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
+
+
+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