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39
40#ifndef WAVEDECODER_H
41#define WAVEDECODER_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/qiodevice.h>
55#include <qaudioformat.h>
56
57
58QT_BEGIN_NAMESPACE
59
60
61
62class QWaveDecoder : public QIODevice
63{
64 Q_OBJECT
65
66public:
67 explicit QWaveDecoder(QIODevice *source, QObject *parent = nullptr);
68 ~QWaveDecoder();
69
70 QAudioFormat audioFormat() const;
71 int duration() const;
72
73 qint64 size() const override;
74 bool isSequential() const override;
75 qint64 bytesAvailable() const override;
76
77Q_SIGNALS:
78 void formatKnown();
79 void parsingError();
80
81private Q_SLOTS:
82 void handleData();
83
84private:
85 qint64 readData(char *data, qint64 maxlen) override;
86 qint64 writeData(const char *data, qint64 len) override;
87
88 bool enoughDataAvailable();
89 bool findChunk(const char *chunkId);
90 void discardBytes(qint64 numBytes);
91 void parsingFailed();
92
93 enum State {
94 InitialState,
95 WaitingForFormatState,
96 WaitingForDataState
97 };
98
99 struct chunk
100 {
101 char id[4];
102 quint32 size;
103 };
104 bool peekChunk(chunk* pChunk, bool handleEndianness = true);
105
106 struct RIFFHeader
107 {
108 chunk descriptor;
109 char type[4];
110 };
111 struct WAVEHeader
112 {
113 chunk descriptor;
114 quint16 audioFormat;
115 quint16 numChannels;
116 quint32 sampleRate;
117 quint32 byteRate;
118 quint16 blockAlign;
119 quint16 bitsPerSample;
120 };
121
122 bool haveFormat;
123 qint64 dataSize;
124 QAudioFormat format;
125 QIODevice *source;
126 State state;
127 quint32 junkToSkip;
128 bool bigEndian;
129};
130
131QT_END_NAMESPACE
132
133#endif // WAVEDECODER_H
134

source code of qtmultimedia/src/multimedia/audio/qwavedecoder_p.h