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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 |