view data/fileio/CodedAudioFileReader.h @ 167:665342c6ec57

* Add a bit of resistance to pane dragging so as to make it harder to inadvertently drag in the other axis from the one you intended
author Chris Cannam
date Fri, 22 Sep 2006 16:46:10 +0000
parents 1a42221a1522
children 71dfc6ab3b54
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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 _CODED_AUDIO_FILE_READER_H_
#define _CODED_AUDIO_FILE_READER_H_

#include "AudioFileReader.h"

#include <sndfile.h>

class WavFileReader;

class CodedAudioFileReader : public AudioFileReader
{
public:
    virtual ~CodedAudioFileReader();

    enum CacheMode {
        CacheInTemporaryFile,
        CacheInMemory
    };

    virtual void getInterleavedFrames(size_t start, size_t count,
				      SampleBlock &frames) const;

protected:
    CodedAudioFileReader(CacheMode cacheMode);

    void initialiseDecodeCache(); // samplerate, channels must have been set
    void addSampleToDecodeCache(float sample);
    void finishDecodeCache();
    bool isDecodeCacheInitialised() const { return m_initialised; }

    CacheMode m_cacheMode;
    SampleBlock m_data;
    bool m_initialised;

    QString m_cacheFileName;
    SNDFILE *m_cacheFileWritePtr;
    WavFileReader *m_cacheFileReader;
    float *m_cacheWriteBuffer;
    size_t m_cacheWriteBufferIndex;
    size_t m_cacheWriteBufferSize; // frames
};

#endif