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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
#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_NAMESPACE
class QWaveDecoder : public QIODevice
{
Q_OBJECT
public:
explicit QWaveDecoder(QIODevice *source, QObject *parent = nullptr);
~QWaveDecoder();
QAudioFormat audioFormat() const;
int duration() const;
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 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;
};
bool haveFormat;
qint64 dataSize;
QAudioFormat format;
QIODevice *source;
State state;
quint32 junkToSkip;
bool bigEndian;
};
QT_END_NAMESPACE
#endif // WAVEDECODER_H
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