view transform/FeatureWriter.h @ 537:3cc4b7cd2aa5

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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 _FEATURE_WRITER_H_
#define _FEATURE_WRITER_H_

#include <string>
#include <map>
#include <vector>

#include <QString>

#include "Transform.h"

#include <vamp-hostsdk/Plugin.h>

using std::string;
using std::map;
using std::vector;

class FeatureWriter
{
public:
    virtual ~FeatureWriter() { }

    struct Parameter { // parameter of the writer, not the plugin
        string name;
        string description;
        bool hasArg;
    };
    typedef vector<Parameter> ParameterList;
    virtual ParameterList getSupportedParameters() const {
        return ParameterList();
    }

    virtual void setParameters(map<string, string> &params) {
        return;
    }

    struct TrackMetadata {
        QString title;
        QString maker;
    };
    virtual void setTrackMetadata(QString trackid, TrackMetadata metadata) { }

    // may throw FailedToOpenFile or other exceptions

    virtual void write(QString trackid,
                       const Transform &transform,
                       const Vamp::Plugin::OutputDescriptor &output,
                       const Vamp::Plugin::FeatureList &features,
                       std::string summaryType = "") = 0;

    virtual void flush() { } // whatever the last stream was

    virtual void finish() = 0;
};

#endif