view data/fileio/AudioFileReader.h @ 157:c03ec31005e1

* Add zoom thumbwheels to Pane.  Implement horizontal thumbwheel, and
  vertical depending on layer type (supported for waveform and spectrogram,
  though wrong for log-scale spectrogram at the moment).
* Add bare bones of a spectrum layer.
* Add window icon
* Add shortcut for "insert time instant" on laptops without keypad enter (";")
* Delete FFT processing thread when it exits (at least, next time we're asked
  for something interesting)
* Get audio file extensions from the file readers, and thus from libsndfile for
  the wave file reader -- leads to rather a wide combo box in file dialog though
* Better refresh order for spectrogram (redraw centre section first)

/* -*- 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 "model/Model.h" // for SampleBlock

class AudioFileReader
{
public:
    virtual ~AudioFileReader() { }

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

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

    size_t getFrameCount() const { return m_frameCount; }
    size_t getChannelCount() const { return m_channelCount; }
    size_t getSampleRate() const { return m_sampleRate; }
    
    /** 
     * The subclass implementations of this function must be
     * thread-safe -- that is, safe to call from multiple threads with
     * different arguments on the same object at the same time.
     */
    virtual void getInterleavedFrames(size_t start, size_t count,
				      SampleBlock &frames) const = 0;
    
protected:
    size_t m_frameCount;
    size_t m_channelCount;
    size_t m_sampleRate;
};

#endif