annotate plugin/PluginXml.cpp @ 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.
*/

#include "PluginXml.h"

#include <QRegExp>
#include <QXmlAttributes>

#include <QDomDocument>
#include <QDomElement>
#include <QDomNamedNodeMap>
#include <QDomAttr>

#include <QTextStream>

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

#include <iostream>

PluginXml::PluginXml(Vamp::PluginBase *plugin) :
    m_plugin(plugin)
{
}

PluginXml::~PluginXml() { }

QString
PluginXml::encodeConfigurationChars(QString text)
{
    QString rv(text);
    rv.replace(";", "[[SEMICOLON]]");
    rv.replace("=", "[[EQUALS]]");
    return rv;
}

QString
PluginXml::decodeConfigurationChars(QString text)
{
    QString rv(text);
    rv.replace("[[SEMICOLON]]", ";");
    rv.replace("[[EQUALS]]", "=");
    return rv;
}
    
void
PluginXml::toXml(QTextStream &stream,
                 QString indent, QString extraAttributes) const
{
    stream << indent;

    stream << QString("<plugin identifier=\"%1\" name=\"%2\" description=\"%3\" maker=\"%4\" version=\"%5\" copyright=\"%6\" %7 ")
        .arg(encodeEntities(QString(m_plugin->getIdentifier().c_str())))
        .arg(encodeEntities(QString(m_plugin->getName().c_str())))
        .arg(encodeEntities(QString(m_plugin->getDescription().c_str())))
        .arg(encodeEntities(QString(m_plugin->getMaker().c_str())))
        .arg(m_plugin->getPluginVersion())
        .arg(encodeEntities(QString(m_plugin->getCopyright().c_str())))
        .arg(extraAttributes);

    if (!m_plugin->getPrograms().empty()) {
        stream << QString("program=\"%1\" ")
            .arg(encodeEntities(m_plugin->getCurrentProgram().c_str()));
    }

    Vamp::PluginBase::ParameterList parameters =
        m_plugin->getParameterDescriptors();

    for (Vamp::PluginBase::ParameterList::const_iterator i = parameters.begin();
         i != parameters.end(); ++i) {

//        SVDEBUG << "PluginXml::toXml: parameter name \""
//                  << i->name.c_str() << "\" has value "
//                  << m_plugin->getParameter(i->name) << endl;

        stream << QString("param-%1=\"%2\" ")
            .arg(stripInvalidParameterNameCharacters(QString(i->identifier.c_str())))
            .arg(m_plugin->getParameter(i->identifier));
    }

    RealTimePluginInstance *rtpi =
        dynamic_cast<RealTimePluginInstance *>(m_plugin);
    if (rtpi) {
        std::map<std::string, std::string> configurePairs =
            rtpi->getConfigurePairs();
        QString config;
        for (std::map<std::string, std::string>::iterator i = configurePairs.begin();
             i != configurePairs.end(); ++i) {
            QString key = i->first.c_str();
            QString value = i->second.c_str();
            key = encodeConfigurationChars(key);
            value = encodeConfigurationChars(value);
            if (config != "") config += ";";
            config += QString("%1=%2").arg(key).arg(value);
        }
        if (config != "") {
            stream << QString("configuration=\"%1\" ")
                .arg(encodeEntities(config));
        }
    }

    stream << "/>\n";
}

#define CHECK_ATTRIBUTE(ATTRIBUTE, ACCESSOR) \
    QString ATTRIBUTE = attrs.value(#ATTRIBUTE); \
    if (ATTRIBUTE != "" && ATTRIBUTE != ACCESSOR().c_str()) { \
        cerr << "WARNING: PluginXml::setParameters: Plugin " \
                  << #ATTRIBUTE << " does not match (attributes have \"" \
                  << ATTRIBUTE << "\", my " \
                  << #ATTRIBUTE << " is \"" << ACCESSOR() << "\")" << endl; \
    }

void
PluginXml::setParameters(const QXmlAttributes &attrs)
{
    CHECK_ATTRIBUTE(identifier, m_plugin->getIdentifier);
    CHECK_ATTRIBUTE(name, m_plugin->getName);
    CHECK_ATTRIBUTE(description, m_plugin->getDescription);
    CHECK_ATTRIBUTE(maker, m_plugin->getMaker);
    CHECK_ATTRIBUTE(copyright, m_plugin->getCopyright);

    bool ok;
    int version = attrs.value("version").trimmed().toInt(&ok);
    if (ok && version != m_plugin->getPluginVersion()) {
        cerr << "WARNING: PluginXml::setParameters: Plugin version does not match (attributes have " << version << ", my version is " << m_plugin->getPluginVersion() << ")" << endl;
    }

    RealTimePluginInstance *rtpi =
        dynamic_cast<RealTimePluginInstance *>(m_plugin);
    if (rtpi) {
        QString config = attrs.value("configuration");
        if (config != "") {
            QStringList configList = config.split(";");
            for (QStringList::iterator i = configList.begin();
                 i != configList.end(); ++i) {
                QStringList kv = i->split("=");
                if (kv.count() < 2) {
                    cerr << "WARNING: PluginXml::setParameters: Malformed configure pair string: \"" << *i << "\"" << endl;
                    continue;
                }
                QString key(kv[0]), value(kv[1]);
                key = decodeConfigurationChars(key);
                value = decodeConfigurationChars(value);
                rtpi->configure(key.toStdString(), value.toStdString());
            }
        }
    }

    if (!m_plugin->getPrograms().empty()) {
        m_plugin->selectProgram(attrs.value("program").toStdString());
    }

    Vamp::PluginBase::ParameterList parameters =
        m_plugin->getParameterDescriptors();

    for (Vamp::PluginBase::ParameterList::const_iterator i =
             parameters.begin(); i != parameters.end(); ++i) {

        QString pname = QString("param-%1")
            .arg(stripInvalidParameterNameCharacters
                 (QString(i->identifier.c_str())));

        if (attrs.value(pname) == "") {
//            SVDEBUG << "PluginXml::setParameters: no parameter \"" << i->name << "\" (attribute \"" << name << "\")" << endl;
            continue;
        }

        bool ok;
        float value = attrs.value(pname).trimmed().toFloat(&ok);
        if (ok) {
//            SVDEBUG << "PluginXml::setParameters: setting parameter \""
//                      << i->identifier << "\" to value " << value << endl;
            m_plugin->setParameter(i->identifier, value);
        } else {
            cerr << "WARNING: PluginXml::setParameters: Invalid value \"" << attrs.value(pname) << "\" for parameter \"" << i->identifier << "\" (attribute \"" << pname << "\")" << endl;
        }
    }
}

void
PluginXml::setParametersFromXml(QString xml)
{
    QDomDocument doc;

    QString error;
    int errorLine;
    int errorColumn;

//    SVDEBUG << "PluginXml::setParametersFromXml: XML is \""
//              << xml << "\"" << endl;

    if (!doc.setContent(xml, false, &error, &errorLine, &errorColumn)) {
        cerr << "PluginXml::setParametersFromXml: Error in parsing XML: " << error << " at line " << errorLine << ", column " << errorColumn << endl;
        cerr << "Input follows:" << endl;
        cerr << xml << endl;
        cerr << "Input ends." << endl;
        return;
    }

    QDomElement pluginElt = doc.firstChildElement("plugin");
    QDomNamedNodeMap attrNodes = pluginElt.attributes();
    QXmlAttributes attrs;

    for (int i = 0; i < attrNodes.length(); ++i) {
        QDomAttr attr = attrNodes.item(i).toAttr();
        if (attr.isNull()) continue;
//        SVDEBUG << "PluginXml::setParametersFromXml: Adding attribute \"" << attr.name()//                  << "\" with value \"" << attr.value() << "\"" << endl;
        attrs.append(attr.name(), "", "", attr.value());
    }

    setParameters(attrs);
}

QString
PluginXml::stripInvalidParameterNameCharacters(QString s) const
{
    s.replace(QRegExp("[^a-zA-Z0-9_]*"), "");
    return s;
}