annotate data/fileio/MP3FileReader.h @ 299:576be0d0d218

* Merge transform directory from sv-match-alignment branch
  (the previous comment included notes for this stuff, but I missed it
  in the actual merge)
* Fix crash when a transform fails to create an output model and the
  thread that created the transform then deletes its input model thinking
  it's no longer needed, even though the transform run thread is still
  using it -- fix is to wait() on the transform before returning the
  null output model

/* -*- 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 "base/Thread.h"
#include <mad.h>

#include <set>

class QProgressDialog;

class MP3FileReader : public CodedAudioFileReader
{
public:
    enum DecodeMode {
        DecodeAtOnce, // decode the file on construction, with progress dialog
        DecodeThreaded // decode in a background thread after construction
    };

    MP3FileReader(QString path,
                  DecodeMode decodeMode,
                  CacheMode cacheMode,
                  size_t targetRate = 0);
    virtual ~MP3FileReader();

    virtual QString getError() const { return m_error; }

    virtual QString getTitle() const { return m_title; }
    
    static void getSupportedExtensions(std::set<QString> &extensions);
    
    virtual int getDecodeCompletion() const { return m_completion; }

    virtual bool isUpdating() const {
        return m_decodeThread && m_decodeThread->isRunning();
    }

protected:
    QString m_path;
    QString m_error;
    QString m_title;
    size_t m_fileSize;
    double m_bitrateNum;
    size_t m_bitrateDenom;
    int m_completion;
    bool m_done;

    unsigned char *m_filebuffer;
    float **m_samplebuffer;
    size_t m_samplebuffersize;

    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 *);

    class DecodeThread : public Thread
    {
    public:
        DecodeThread(MP3FileReader *reader) : m_reader(reader) { }
        virtual void run();

    protected:
        MP3FileReader *m_reader;
    };

    DecodeThread *m_decodeThread;

    void loadTags();
};

#endif

#endif