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    41 

    42 #ifndef WAVEDECODER_H

    43 #define WAVEDECODER_H

    44 

    45 #include <QtCore/qiodevice.h>

    46 #include <QtMultimedia/qaudioformat.h>

    47 

    48 class WaveDecoder : public QIODevice

    49 {

    50 Q_OBJECT

    51 

    52 public:

    53     explicit WaveDecoder(QIODevice *source, QObject *parent = 0);

    54     ~WaveDecoder();

    55 

    56     QAudioFormat audioFormat() const;

    57     int duration() const;

    58 

    59     qint64 size() const;

    60     bool isSequential() const;

    61     qint64 bytesAvailable() const;

    62 

    63 signals:

    64     void formatKnown();

    65     void invalidFormat();

    66 

    67 private slots:

    68     void handleData();

    69 

    70 private:

    71     qint64 readData(char *data, qint64 maxlen);

    72     qint64 writeData(const char *data, qint64 len);

    73 

    74     struct chunk

    75     {

    76         char        id[4];

    77         quint32     size;

    78     };

    79     struct RIFFHeader

    80     {

    81         chunk       descriptor;

    82         char        type[4];

    83     };

    84     struct WAVEHeader

    85     {

    86         chunk       descriptor;

    87         quint16     audioFormat;

    88         quint16     numChannels;

    89         quint32     sampleRate;

    90         quint32     byteRate;

    91         quint16     blockAlign;

    92         quint16     bitsPerSample;

    93     };

    94     struct DATAHeader

    95     {

    96         chunk       descriptor;

    97     };

    98     struct CombinedHeader

    99     {

   100         RIFFHeader  riff;

   101         WAVEHeader  wave;

   102         DATAHeader  data;

   103     };

   104 

   105     bool haveFormat;

   106     qint64 dataSize;

   107     qint64 remaining;

   108     QAudioFormat format;

   109     QIODevice *source;

   110     CombinedHeader header;

   111 };

   112 

   113 #endif // WAVEDECODER_H