135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Mobility Components.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef WAVEDECODER_H
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#define WAVEDECODER_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists for the convenience
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// of other Qt classes. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include <QtCore/qiodevice.h>
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#include <qaudioformat.h>
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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class QWaveDecoder : public QIODevice
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{
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Q_OBJECT
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public:
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explicit QWaveDecoder(QIODevice *source, QObject *parent = 0);
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~QWaveDecoder();
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QAudioFormat audioFormat() const;
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int duration() const;
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qint64 size() const;
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bool isSequential() const;
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qint64 bytesAvailable() const;
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Q_SIGNALS:
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void formatKnown();
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void invalidFormat();
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private Q_SLOTS:
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void handleData();
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private:
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qint64 readData(char *data, qint64 maxlen);
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qint64 writeData(const char *data, qint64 len);
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bool enoughDataAvailable();
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bool findChunk(const char *chunkId);
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void discardBytes(qint64 numBytes);
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enum State {
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InitialState,
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WaitingForFormatState,
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WaitingForDataState
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};
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struct chunk
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{
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char id[4];
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quint32 size;
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};
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struct RIFFHeader
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{
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chunk descriptor;
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char type[4];
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};
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struct WAVEHeader
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{
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chunk descriptor;
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quint16 audioFormat;
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quint16 numChannels;
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quint32 sampleRate;
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quint32 byteRate;
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quint16 blockAlign;
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quint16 bitsPerSample;
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};
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bool haveFormat;
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qint64 dataSize;
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qint64 remaining;
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QAudioFormat format;
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QIODevice *source;
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State state;
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};
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QT_END_NAMESPACE
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QT_END_HEADER
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#endif // WAVEDECODER_H
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