annotate plugin/PluginXml.h @ 1196:c7b9c902642f spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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 _PLUGIN_XML_H_
#define _PLUGIN_XML_H_

#include "base/XmlExportable.h"
#include <vamp-hostsdk/PluginBase.h>

class QXmlAttributes;

class PluginXml : public XmlExportable
{
public:
    PluginXml(Vamp::PluginBase *plugin);
    virtual ~PluginXml();

    /**
     * Export plugin settings to XML.
     */
    virtual void toXml(QTextStream &stream,
                       QString indent = "",
                       QString extraAttributes = "") const;

    /**
     * Set the parameters and program of a plugin from a set of XML
     * attributes.  This is a partial inverse of toXml.
     */
    virtual void setParameters(const QXmlAttributes &);

    /**
     * Set the parameters and program of a plugin from an XML plugin
     * element as returned by toXml.  This is a partial inverse of
     * toXml.
     */
    virtual void setParametersFromXml(QString xml);

    static QString encodeConfigurationChars(QString text);
    static QString decodeConfigurationChars(QString text);

protected:
    QString stripInvalidParameterNameCharacters(QString) const;

    Vamp::PluginBase *m_plugin;
};

#endif