view transform/FileFeatureWriter.h @ 1247:8f076d02569a piper

Make SVDEBUG always write to a log file -- formerly this was disabled in NDEBUG builds. I think there's little use to that, it just means that we keep adding more cerr debug output because we aren't getting the log we need. And SVDEBUG logging is not usually used in tight loops, I don't think the performance overhead is too serious.

Also update the About box.

/* -*- 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.

    Sonic Annotator
    A utility for batch feature extraction from audio files.

    Mark Levy, Chris Sutton and Chris Cannam, Queen Mary, University of London.
    Copyright 2007-2008 QMUL.

    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 _FILE_FEATURE_WRITER_H_
#define _FILE_FEATURE_WRITER_H_

#include <string>
#include <map>
#include <set>

#include "FeatureWriter.h"

using std::string;
using std::map;
using std::set;
using std::pair;

class QTextStream;
class QTextCodec;
class QFile;

class FileFeatureWriter : public FeatureWriter
{
public:
    virtual ~FileFeatureWriter();

    virtual ParameterList getSupportedParameters() const;
    virtual void setParameters(map<string, string> &params);

    virtual void testOutputFile(QString trackId, TransformId transformId);
    virtual void flush();
    virtual void finish();

protected:
    enum FileWriteSupport {
        SupportOneFilePerTrackTransform = 1,
        SupportOneFilePerTrack = 2,
        SupportOneFileTotal = 4,
        SupportStdOut = 8
    };

    FileFeatureWriter(int support, QString extension);
    QTextStream *getOutputStream(QString, TransformId, QTextCodec *);

    typedef pair<QString, TransformId> TrackTransformPair;
    typedef map<TrackTransformPair, QString> FileNameMap;
    typedef map<TrackTransformPair, QFile *> FileMap;
    typedef map<QFile *, QTextStream *> FileStreamMap;
    FileMap m_files;
    FileNameMap m_filenames;
    FileStreamMap m_streams;
    QTextStream *m_prevstream;

    TrackTransformPair getFilenameKey(QString, TransformId);

    // Come up with a suitable output filename for the given track ID - 
    // transform ID combo. Fail if it already exists, etc.
    QString createOutputFilename(QString, TransformId);

    // Look up and return the output filename for the given track ID -
    // transform ID combo.
    QString getOutputFilename(QString, TransformId);

    // Look up and return the output file handle for the given track
    // ID - transform ID combo. Return 0 if it could not be opened.
    QFile *getOutputFile(QString, TransformId);
    
    // subclass can implement this to be called before file is opened for append
    virtual void reviewFileForAppending(QString) { }

    int m_support;
    QString m_extension;
    QString m_baseDir;
    bool m_manyFiles;
    QString m_singleFileName;
    bool m_stdout;
    bool m_append;
    bool m_force;
};

#endif