annotate plugin/DSSIPluginFactory.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 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.
*/

/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2006 Chris Cannam.
*/

#ifndef _DSSI_PLUGIN_FACTORY_H_
#define _DSSI_PLUGIN_FACTORY_H_

#define DSSI_API_LEVEL 2

#include "LADSPAPluginFactory.h"
#include "api/dssi.h"

#include <QMutex>

class DSSIPluginInstance;

class DSSIPluginFactory : public LADSPAPluginFactory
{
public:
    virtual ~DSSIPluginFactory();

    virtual void enumeratePlugins(std::vector<QString> &list);

    virtual RealTimePluginInstance *instantiatePlugin(QString identifier,
						      int clientId,
						      int position,
						      sv_samplerate_t sampleRate,
						      int blockSize,
						      int channels);

protected:
    DSSIPluginFactory();
    friend class RealTimePluginFactory;

    virtual PluginScan::PluginType getPluginType() const {
        return PluginScan::DSSIPlugin;
    }

    virtual std::vector<QString> getPluginPath();

    virtual std::vector<QString> getLRDFPath(QString &baseUri);

    virtual void discoverPluginsFrom(QString soName);

    virtual const LADSPA_Descriptor *getLADSPADescriptor(QString identifier);
    virtual const DSSI_Descriptor *getDSSIDescriptor(QString identifier);

    DSSI_Host_Descriptor m_hostDescriptor;
};

#endif