view data/fileio/MP3FileReader.h @ 205:05154c7bb90b

* Basics of an approximate way of managing memory that we've committed to using
  but haven't allocated yet

/* -*- 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 _MP3_FILE_READER_H_
#define _MP3_FILE_READER_H_

#ifdef HAVE_MAD

#include "CodedAudioFileReader.h"

#include <mad.h>

#include <set>

class QProgressDialog;

class MP3FileReader : public CodedAudioFileReader
{
public:
    MP3FileReader(QString path, bool showProgress, CacheMode cacheMode);
    virtual ~MP3FileReader();

    virtual QString getError() const { return m_error; }

    static void getSupportedExtensions(std::set<QString> &extensions);
    
protected:
    QString m_path;
    QString m_error;
    size_t m_fileSize;
    double m_bitrateNum;
    size_t m_bitrateDenom;

    QProgressDialog *m_progress;
    bool m_cancelled;

    struct DecoderData
    {
	unsigned char const *start;
	unsigned long length;
	MP3FileReader *reader;
    };

    bool decode(void *mm, size_t sz);
    enum mad_flow accept(struct mad_header const *, struct mad_pcm *);

    static enum mad_flow input(void *, struct mad_stream *);
    static enum mad_flow output(void *, struct mad_header const *, struct mad_pcm *);
    static enum mad_flow error(void *, struct mad_stream *, struct mad_frame *);
};

#endif

#endif