summaryrefslogtreecommitdiffstats
path: root/src/multimedia/audio/qwavedecoder_p.h
blob: 7797fa9c769b490b4b9f475c1e13126c7d05736b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/

#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