annotate data/fileio/OggVorbisFileReader.h @ 264:260032c26c4f

* don't store fft values scaled by fftsize/2; that's a special requirement
  for the spectrogram, and other applications will not expect it -- make the
  spectrogram do that scaling itself
* add a higher-resolution memory cache (still polar, though) as an alternative
  to the 16-bit compact cache
* don't use the memory cache if we want rectangular coords (unless the disc
  cache is totally infeasible) as conversion slows it down anyway
* avoid redundant rectangular -> polar -> rectangular conversion when storing
  values in a rectangular-mode disc cache

/* -*- 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 _OGG_VORBIS_FILE_READER_H_
#define _OGG_VORBIS_FILE_READER_H_

#ifdef HAVE_OGGZ
#ifdef HAVE_FISHSOUND

#include "CodedAudioFileReader.h"

#include "base/Thread.h"
#include <oggz/oggz.h>
#include <fishsound/fishsound.h>

#include <set>

class QProgressDialog;

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

    OggVorbisFileReader(QString path, DecodeMode decodeMode,
                        CacheMode cacheMode);
    virtual ~OggVorbisFileReader();

    virtual QString getError() const { return m_error; }

    static void getSupportedExtensions(std::set<QString> &extensions);

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

protected:
    QString m_path;
    QString m_error;

    OGGZ *m_oggz;
    FishSound *m_fishSound;
    QProgressDialog *m_progress;
    size_t m_fileSize;
    size_t m_bytesRead;
    bool m_cancelled;
 
    static int readPacket(OGGZ *, ogg_packet *, long, void *);
    static int acceptFrames(FishSound *, float **, long, void *);

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

    protected:
        OggVorbisFileReader *m_reader; 
    };

    DecodeThread *m_decodeThread;
};

#endif
#endif

#endif