AudioFileReader.h

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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _AUDIO_FILE_READER_H_
#define _AUDIO_FILE_READER_H_

#include <QString>

#include "FileSource.h"

#include <vector>
#include <map>

typedef std::vector<float> SampleBlock;

class AudioFileReader : public QObject
{
    Q_OBJECT

public:
    virtual ~AudioFileReader() { }

    bool isOK() const { return (m_channelCount > 0); }

    virtual QString getError() const { return ""; }

    int getFrameCount() const { return m_frameCount; }
    int getChannelCount() const { return m_channelCount; }
    int getSampleRate() const { return m_sampleRate; }

    virtual int getNativeRate() const { return m_sampleRate; } // if resampled

    virtual QString getLocation() const { return ""; }
    
    virtual QString getTitle() const { return ""; }

    virtual QString getMaker() const { return ""; }

    typedef std::map<QString, QString> TagMap;
    virtual TagMap getTags() const { return TagMap(); }

    virtual bool isQuicklySeekable() const = 0;

    virtual void getInterleavedFrames(int start, int count,
                                      SampleBlock &frames) const = 0;

    virtual void getDeInterleavedFrames(int start, int count,
                                        std::vector<SampleBlock> &frames) const;

    // only subclasses that do not know exactly how long the audio
    // file is until it's been completely decoded should implement this
    virtual int getDecodeCompletion() const { return 100; } // %

    virtual bool isUpdating() const { return false; }

signals:
    void frameCountChanged();
    
protected:
    int m_frameCount;
    int m_channelCount;
    int m_sampleRate;
};

#endif