116 lines
2.8 KiB
C++
116 lines
2.8 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#ifndef WAVEDECODER_H
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#define WAVEDECODER_H
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#include <QtCore/qiodevice.h>
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#include <QtMultimedia/qaudioformat.h>
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QT_BEGIN_NAMESPACE
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class Q_MULTIMEDIA_EXPORT QWaveDecoder : public QIODevice
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{
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Q_OBJECT
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public:
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explicit QWaveDecoder(QIODevice *device, QObject *parent = nullptr);
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explicit QWaveDecoder(QIODevice *device, const QAudioFormat &format,
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QObject *parent = nullptr);
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~QWaveDecoder() override;
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QAudioFormat audioFormat() const;
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QIODevice* getDevice();
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int duration() const;
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static qint64 headerLength();
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bool open(QIODevice::OpenMode mode) override;
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void close() override;
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bool seek(qint64 pos) override;
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qint64 pos() const override;
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void setIODevice(QIODevice *device);
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qint64 size() const override;
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bool isSequential() const override;
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qint64 bytesAvailable() const override;
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Q_SIGNALS:
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void formatKnown();
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void parsingError();
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private Q_SLOTS:
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void handleData();
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private:
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qint64 readData(char *data, qint64 maxlen) override;
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qint64 writeData(const char *data, qint64 len) override;
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bool writeHeader();
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bool writeDataLength();
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bool enoughDataAvailable();
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bool findChunk(const char *chunkId);
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void discardBytes(qint64 numBytes);
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void parsingFailed();
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enum State {
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InitialState,
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WaitingForFormatState,
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WaitingForDataState
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};
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struct chunk
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{
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char id[4]; // A four-character code that identifies the representation of the chunk data
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// padded on the right with blank characters (ASCII 32)
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quint32 size; // Does not include the size of the id or size fields or the pad byte at the end of payload
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};
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bool peekChunk(chunk* pChunk, bool handleEndianness = true);
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struct RIFFHeader
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{
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chunk descriptor;
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char type[4];
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};
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struct WAVEHeader
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{
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chunk descriptor;
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quint16 audioFormat;
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quint16 numChannels;
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quint32 sampleRate;
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quint32 byteRate;
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quint16 blockAlign;
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quint16 bitsPerSample;
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};
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struct DATAHeader
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{
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chunk descriptor;
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};
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struct CombinedHeader
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{
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RIFFHeader riff;
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WAVEHeader wave;
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DATAHeader data;
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};
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static const int HeaderLength = sizeof(CombinedHeader);
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bool haveFormat = false;
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bool haveHeader = false;
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qint64 dataSize = 0;
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QIODevice *device = nullptr;
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QAudioFormat format;
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State state = InitialState;
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quint32 junkToSkip = 0;
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bool bigEndian = false;
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bool byteSwap = false;
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int bps = 0;
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};
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QT_END_NAMESPACE
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#endif // WAVEDECODER_H
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