annotate plugin/transform/ModelTransformerFactory.cpp @ 331:f620ce48c950

* Further naming change: Transformer -> ModelTransformer.
  The Transform class now describes a thing that can be done, and the
  ModelTransformer does it to a Model.

/* -*- 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 and 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.
*/

#include "ModelTransformerFactory.h"

#include "FeatureExtractionModelTransformer.h"
#include "RealTimeEffectModelTransformer.h"

#include "plugin/FeatureExtractionPluginFactory.h"
#include "plugin/RealTimePluginFactory.h"
#include "plugin/PluginXml.h"

#include "widgets/PluginParameterDialog.h"

#include "data/model/DenseTimeValueModel.h"

#include "vamp-sdk/PluginHostAdapter.h"

#include "audioio/AudioCallbackPlaySource.h" //!!! shouldn't include here

#include <iostream>
#include <set>

#include <QRegExp>

ModelTransformerFactory *
ModelTransformerFactory::m_instance = new ModelTransformerFactory;

ModelTransformerFactory *
ModelTransformerFactory::getInstance()
{
    return m_instance;
}

ModelTransformerFactory::~ModelTransformerFactory()
{
}

TransformList
ModelTransformerFactory::getAllTransforms()
{
    if (m_transforms.empty()) populateTransforms();

    std::set<TransformDescription> dset;
    for (TransformDescriptionMap::const_iterator i = m_transforms.begin();
	 i != m_transforms.end(); ++i) {
	dset.insert(i->second);
    }

    TransformList list;
    for (std::set<TransformDescription>::const_iterator i = dset.begin();
	 i != dset.end(); ++i) {
	list.push_back(*i);
    }

    return list;
}

std::vector<QString>
ModelTransformerFactory::getAllTransformerTypes()
{
    if (m_transforms.empty()) populateTransforms();

    std::set<QString> types;
    for (TransformDescriptionMap::const_iterator i = m_transforms.begin();
	 i != m_transforms.end(); ++i) {
        types.insert(i->second.type);
    }

    std::vector<QString> rv;
    for (std::set<QString>::iterator i = types.begin(); i != types.end(); ++i) {
        rv.push_back(*i);
    }

    return rv;
}

std::vector<QString>
ModelTransformerFactory::getTransformerCategories(QString transformType)
{
    if (m_transforms.empty()) populateTransforms();

    std::set<QString> categories;
    for (TransformDescriptionMap::const_iterator i = m_transforms.begin();
         i != m_transforms.end(); ++i) {
        if (i->second.type == transformType) {
            categories.insert(i->second.category);
        }
    }

    bool haveEmpty = false;
    
    std::vector<QString> rv;
    for (std::set<QString>::iterator i = categories.begin(); 
         i != categories.end(); ++i) {
        if (*i != "") rv.push_back(*i);
        else haveEmpty = true;
    }

    if (haveEmpty) rv.push_back(""); // make sure empty category sorts last

    return rv;
}

std::vector<QString>
ModelTransformerFactory::getTransformerMakers(QString transformType)
{
    if (m_transforms.empty()) populateTransforms();

    std::set<QString> makers;
    for (TransformDescriptionMap::const_iterator i = m_transforms.begin();
         i != m_transforms.end(); ++i) {
        if (i->second.type == transformType) {
            makers.insert(i->second.maker);
        }
    }

    bool haveEmpty = false;
    
    std::vector<QString> rv;
    for (std::set<QString>::iterator i = makers.begin(); 
         i != makers.end(); ++i) {
        if (*i != "") rv.push_back(*i);
        else haveEmpty = true;
    }

    if (haveEmpty) rv.push_back(""); // make sure empty category sorts last

    return rv;
}

void
ModelTransformerFactory::populateTransforms()
{
    TransformDescriptionMap transforms;

    populateFeatureExtractionPlugins(transforms);
    populateRealTimePlugins(transforms);

    // disambiguate plugins with similar names

    std::map<QString, int> names;
    std::map<QString, QString> pluginSources;
    std::map<QString, QString> pluginMakers;

    for (TransformDescriptionMap::iterator i = transforms.begin();
         i != transforms.end(); ++i) {

        TransformDescription desc = i->second;

        QString td = desc.name;
        QString tn = td.section(": ", 0, 0);
        QString pn = desc.identifier.section(":", 1, 1);

        if (pluginSources.find(tn) != pluginSources.end()) {
            if (pluginSources[tn] != pn && pluginMakers[tn] != desc.maker) {
                ++names[tn];
            }
        } else {
            ++names[tn];
            pluginSources[tn] = pn;
            pluginMakers[tn] = desc.maker;
        }
    }

    std::map<QString, int> counts;
    m_transforms.clear();

    for (TransformDescriptionMap::iterator i = transforms.begin();
         i != transforms.end(); ++i) {

        TransformDescription desc = i->second;
	QString identifier = desc.identifier;
        QString maker = desc.maker;

        QString td = desc.name;
        QString tn = td.section(": ", 0, 0);
        QString to = td.section(": ", 1);

	if (names[tn] > 1) {
            maker.replace(QRegExp(tr(" [\\(<].*$")), "");
	    tn = QString("%1 [%2]").arg(tn).arg(maker);
	}

        if (to != "") {
            desc.name = QString("%1: %2").arg(tn).arg(to);
        } else {
            desc.name = tn;
        }

	m_transforms[identifier] = desc;
    }	    
}

void
ModelTransformerFactory::populateFeatureExtractionPlugins(TransformDescriptionMap &transforms)
{
    std::vector<QString> plugs =
	FeatureExtractionPluginFactory::getAllPluginIdentifiers();

    for (size_t i = 0; i < plugs.size(); ++i) {

	QString pluginId = plugs[i];

	FeatureExtractionPluginFactory *factory =
	    FeatureExtractionPluginFactory::instanceFor(pluginId);

	if (!factory) {
	    std::cerr << "WARNING: ModelTransformerFactory::populateTransforms: No feature extraction plugin factory for instance " << pluginId.toLocal8Bit().data() << std::endl;
	    continue;
	}

	Vamp::Plugin *plugin = 
	    factory->instantiatePlugin(pluginId, 48000);

	if (!plugin) {
	    std::cerr << "WARNING: ModelTransformerFactory::populateTransforms: Failed to instantiate plugin " << pluginId.toLocal8Bit().data() << std::endl;
	    continue;
	}
		
	QString pluginName = plugin->getName().c_str();
        QString category = factory->getPluginCategory(pluginId);

	Vamp::Plugin::OutputList outputs =
	    plugin->getOutputDescriptors();

	for (size_t j = 0; j < outputs.size(); ++j) {

	    QString transformId = QString("%1:%2")
		    .arg(pluginId).arg(outputs[j].identifier.c_str());

	    QString userName;
            QString friendlyName;
            QString units = outputs[j].unit.c_str();
            QString description = plugin->getDescription().c_str();
            QString maker = plugin->getMaker().c_str();
            if (maker == "") maker = tr("<unknown maker>");

            if (description == "") {
                if (outputs.size() == 1) {
                    description = tr("Extract features using \"%1\" plugin (from %2)")
                        .arg(pluginName).arg(maker);
                } else {
                    description = tr("Extract features using \"%1\" output of \"%2\" plugin (from %3)")
                        .arg(outputs[j].name.c_str()).arg(pluginName).arg(maker);
                }
            } else {
                if (outputs.size() == 1) {
                    description = tr("%1 using \"%2\" plugin (from %3)")
                        .arg(description).arg(pluginName).arg(maker);
                } else {
                    description = tr("%1 using \"%2\" output of \"%3\" plugin (from %4)")
                        .arg(description).arg(outputs[j].name.c_str()).arg(pluginName).arg(maker);
                }
            }                    

	    if (outputs.size() == 1) {
		userName = pluginName;
                friendlyName = pluginName;
	    } else {
		userName = QString("%1: %2")
		    .arg(pluginName)
		    .arg(outputs[j].name.c_str());
                friendlyName = outputs[j].name.c_str();
	    }

            bool configurable = (!plugin->getPrograms().empty() ||
                                 !plugin->getParameterDescriptors().empty());

//            std::cerr << "Feature extraction plugin transform: " << transformId.toStdString() << std::endl;

	    transforms[transformId] = 
                TransformDescription(tr("Analysis"),
                              category,
                              transformId,
                              userName,
                              friendlyName,
                              description,
                              maker,
                              units,
                              configurable);
	}

        delete plugin;
    }
}

void
ModelTransformerFactory::populateRealTimePlugins(TransformDescriptionMap &transforms)
{
    std::vector<QString> plugs =
	RealTimePluginFactory::getAllPluginIdentifiers();

    static QRegExp unitRE("[\\[\\(]([A-Za-z0-9/]+)[\\)\\]]$");

    for (size_t i = 0; i < plugs.size(); ++i) {
        
	QString pluginId = plugs[i];

        RealTimePluginFactory *factory =
            RealTimePluginFactory::instanceFor(pluginId);

	if (!factory) {
	    std::cerr << "WARNING: ModelTransformerFactory::populateTransforms: No real time plugin factory for instance " << pluginId.toLocal8Bit().data() << std::endl;
	    continue;
	}

        const RealTimePluginDescriptor *descriptor =
            factory->getPluginDescriptor(pluginId);

        if (!descriptor) {
	    std::cerr << "WARNING: ModelTransformerFactory::populateTransforms: Failed to query plugin " << pluginId.toLocal8Bit().data() << std::endl;
	    continue;
	}
	
//!!!        if (descriptor->controlOutputPortCount == 0 ||
//            descriptor->audioInputPortCount == 0) continue;

//        std::cout << "ModelTransformerFactory::populateRealTimePlugins: plugin " << pluginId.toStdString() << " has " << descriptor->controlOutputPortCount << " control output ports, " << descriptor->audioOutputPortCount << " audio outputs, " << descriptor->audioInputPortCount << " audio inputs" << std::endl;
	
	QString pluginName = descriptor->name.c_str();
        QString category = factory->getPluginCategory(pluginId);
        bool configurable = (descriptor->parameterCount > 0);
        QString maker = descriptor->maker.c_str();
        if (maker == "") maker = tr("<unknown maker>");

        if (descriptor->audioInputPortCount > 0) {

            for (size_t j = 0; j < descriptor->controlOutputPortCount; ++j) {

                QString transformId = QString("%1:%2").arg(pluginId).arg(j);
                QString userName;
                QString units;
                QString portName;

                if (j < descriptor->controlOutputPortNames.size() &&
                    descriptor->controlOutputPortNames[j] != "") {

                    portName = descriptor->controlOutputPortNames[j].c_str();

                    userName = tr("%1: %2")
                        .arg(pluginName)
                        .arg(portName);

                    if (unitRE.indexIn(portName) >= 0) {
                        units = unitRE.cap(1);
                    }

                } else if (descriptor->controlOutputPortCount > 1) {

                    userName = tr("%1: Output %2")
                        .arg(pluginName)
                        .arg(j + 1);

                } else {

                    userName = pluginName;
                }

                QString description;

                if (portName != "") {
                    description = tr("Extract \"%1\" data output from \"%2\" effect plugin (from %3)")
                        .arg(portName)
                        .arg(pluginName)
                        .arg(maker);
                } else {
                    description = tr("Extract data output %1 from \"%2\" effect plugin (from %3)")
                        .arg(j + 1)
                        .arg(pluginName)
                        .arg(maker);
                }

                transforms[transformId] = 
                    TransformDescription(tr("Effects Data"),
                                  category,
                                  transformId,
                                  userName,
                                  userName,
                                  description,
                                  maker,
                                  units,
                                  configurable);
            }
        }

        if (!descriptor->isSynth || descriptor->audioInputPortCount > 0) {

            if (descriptor->audioOutputPortCount > 0) {

                QString transformId = QString("%1:A").arg(pluginId);
                QString type = tr("Effects");

                QString description = tr("Transformer audio signal with \"%1\" effect plugin (from %2)")
                    .arg(pluginName)
                    .arg(maker);

                if (descriptor->audioInputPortCount == 0) {
                    type = tr("Generators");
                    QString description = tr("Generate audio signal using \"%1\" plugin (from %2)")
                        .arg(pluginName)
                        .arg(maker);
                }

                transforms[transformId] =
                    TransformDescription(type,
                                  category,
                                  transformId,
                                  pluginName,
                                  pluginName,
                                  description,
                                  maker,
                                  "",
                                  configurable);
            }
        }
    }
}

bool
ModelTransformerFactory::haveTransformer(TransformId identifier)
{
    return (m_transforms.find(identifier) != m_transforms.end());
}

QString
ModelTransformerFactory::getTransformerName(TransformId identifier)
{
    if (m_transforms.find(identifier) != m_transforms.end()) {
	return m_transforms[identifier].name;
    } else return "";
}

QString
ModelTransformerFactory::getTransformerFriendlyName(TransformId identifier)
{
    if (m_transforms.find(identifier) != m_transforms.end()) {
	return m_transforms[identifier].friendlyName;
    } else return "";
}

QString
ModelTransformerFactory::getTransformerUnits(TransformId identifier)
{
    if (m_transforms.find(identifier) != m_transforms.end()) {
	return m_transforms[identifier].units;
    } else return "";
}

bool
ModelTransformerFactory::isTransformerConfigurable(TransformId identifier)
{
    if (m_transforms.find(identifier) != m_transforms.end()) {
	return m_transforms[identifier].configurable;
    } else return false;
}

bool
ModelTransformerFactory::getTransformerChannelRange(TransformId identifier,
                                           int &min, int &max)
{
    QString id = identifier.section(':', 0, 2);

    if (FeatureExtractionPluginFactory::instanceFor(id)) {

        Vamp::Plugin *plugin = 
            FeatureExtractionPluginFactory::instanceFor(id)->
            instantiatePlugin(id, 48000);
        if (!plugin) return false;

        min = plugin->getMinChannelCount();
        max = plugin->getMaxChannelCount();
        delete plugin;

        return true;

    } else if (RealTimePluginFactory::instanceFor(id)) {

        const RealTimePluginDescriptor *descriptor = 
            RealTimePluginFactory::instanceFor(id)->
            getPluginDescriptor(id);
        if (!descriptor) return false;

        min = descriptor->audioInputPortCount;
        max = descriptor->audioInputPortCount;

        return true;
    }

    return false;
}

bool
ModelTransformerFactory::getChannelRange(TransformId identifier, Vamp::PluginBase *plugin,
                                  int &minChannels, int &maxChannels)
{
    Vamp::Plugin *vp = 0;
    if ((vp = dynamic_cast<Vamp::Plugin *>(plugin)) ||
        (vp = dynamic_cast<Vamp::PluginHostAdapter *>(plugin))) {
        minChannels = vp->getMinChannelCount();
        maxChannels = vp->getMaxChannelCount();
        return true;
    } else {
        return getTransformerChannelRange(identifier, minChannels, maxChannels);
    }
}

Model *
ModelTransformerFactory::getConfigurationForTransformer(TransformId identifier,
                                               const std::vector<Model *> &candidateInputModels,
                                               PluginTransformer::ExecutionContext &context,
                                               QString &configurationXml,
                                               AudioCallbackPlaySource *source,
                                               size_t startFrame,
                                               size_t duration)
{
    if (candidateInputModels.empty()) return 0;

    //!!! This will need revision -- we'll have to have a callback
    //from the dialog for when the candidate input model is changed,
    //as we'll need to reinitialise the channel settings in the dialog
    Model *inputModel = candidateInputModels[0]; //!!! for now
    QStringList candidateModelNames;
    std::map<QString, Model *> modelMap;
    for (size_t i = 0; i < candidateInputModels.size(); ++i) {
        QString modelName = candidateInputModels[i]->objectName();
        QString origModelName = modelName;
        int dupcount = 1;
        while (modelMap.find(modelName) != modelMap.end()) {
            modelName = tr("%1 <%2>").arg(origModelName).arg(++dupcount);
        }
        modelMap[modelName] = candidateInputModels[i];
        candidateModelNames.push_back(modelName);
    }

    QString id = identifier.section(':', 0, 2);
    QString output = identifier.section(':', 3);
    QString outputLabel = "";
    QString outputDescription = "";
    
    bool ok = false;
    configurationXml = m_lastConfigurations[identifier];

//    std::cerr << "last configuration: " << configurationXml.toStdString() << std::endl;

    Vamp::PluginBase *plugin = 0;

    bool frequency = false;
    bool effect = false;
    bool generator = false;

    if (FeatureExtractionPluginFactory::instanceFor(id)) {

        std::cerr << "getConfigurationForTransformer: instantiating Vamp plugin" << std::endl;

        Vamp::Plugin *vp =
            FeatureExtractionPluginFactory::instanceFor(id)->instantiatePlugin
            (id, inputModel->getSampleRate());

        if (vp) {

            plugin = vp;
            frequency = (vp->getInputDomain() == Vamp::Plugin::FrequencyDomain);

            std::vector<Vamp::Plugin::OutputDescriptor> od =
                vp->getOutputDescriptors();
            if (od.size() > 1) {
                for (size_t i = 0; i < od.size(); ++i) {
                    if (od[i].identifier == output.toStdString()) {
                        outputLabel = od[i].name.c_str();
                        outputDescription = od[i].description.c_str();
                        break;
                    }
                }
            }
        }

    } else if (RealTimePluginFactory::instanceFor(id)) {

        RealTimePluginFactory *factory = RealTimePluginFactory::instanceFor(id);
        const RealTimePluginDescriptor *desc = factory->getPluginDescriptor(id);

        if (desc->audioInputPortCount > 0 && 
            desc->audioOutputPortCount > 0 &&
            !desc->isSynth) {
            effect = true;
        }

        if (desc->audioInputPortCount == 0) {
            generator = true;
        }

        if (output != "A") {
            int outputNo = output.toInt();
            if (outputNo >= 0 && outputNo < int(desc->controlOutputPortCount)) {
                outputLabel = desc->controlOutputPortNames[outputNo].c_str();
            }
        }

        size_t sampleRate = inputModel->getSampleRate();
        size_t blockSize = 1024;
        size_t channels = 1;
        if (effect && source) {
            sampleRate = source->getTargetSampleRate();
            blockSize = source->getTargetBlockSize();
            channels = source->getTargetChannelCount();
        }

        RealTimePluginInstance *rtp = factory->instantiatePlugin
            (id, 0, 0, sampleRate, blockSize, channels);

        plugin = rtp;

        if (effect && source && rtp) {
            source->setAuditioningPlugin(rtp);
        }
    }

    if (plugin) {

        context = PluginTransformer::ExecutionContext(context.channel, plugin);

        if (configurationXml != "") {
            PluginXml(plugin).setParametersFromXml(configurationXml);
        }

        int sourceChannels = 1;
        if (dynamic_cast<DenseTimeValueModel *>(inputModel)) {
            sourceChannels = dynamic_cast<DenseTimeValueModel *>(inputModel)
                ->getChannelCount();
        }

        int minChannels = 1, maxChannels = sourceChannels;
        getChannelRange(identifier, plugin, minChannels, maxChannels);

        int targetChannels = sourceChannels;
        if (!effect) {
            if (sourceChannels < minChannels) targetChannels = minChannels;
            if (sourceChannels > maxChannels) targetChannels = maxChannels;
        }

        int defaultChannel = context.channel;

        PluginParameterDialog *dialog = new PluginParameterDialog(plugin);

        if (candidateModelNames.size() > 1 && !generator) {
            dialog->setCandidateInputModels(candidateModelNames);
        }

        if (startFrame != 0 || duration != 0) {
            dialog->setShowSelectionOnlyOption(true);
        }

        if (targetChannels > 0) {
            dialog->setChannelArrangement(sourceChannels, targetChannels,
                                          defaultChannel);
        }
        
        dialog->setOutputLabel(outputLabel, outputDescription);
        
        dialog->setShowProcessingOptions(true, frequency);

        if (dialog->exec() == QDialog::Accepted) {
            ok = true;
        }

        QString selectedInput = dialog->getInputModel();
        if (selectedInput != "") {
            if (modelMap.find(selectedInput) != modelMap.end()) {
                inputModel = modelMap[selectedInput];
                std::cerr << "Found selected input \"" << selectedInput.toStdString() << "\" in model map, result is " << inputModel << std::endl;
            } else {
                std::cerr << "Failed to find selected input \"" << selectedInput.toStdString() << "\" in model map" << std::endl;
            }
        } else {
            std::cerr << "Selected input empty: \"" << selectedInput.toStdString() << "\"" << std::endl;
        }

        configurationXml = PluginXml(plugin).toXmlString();
        context.channel = dialog->getChannel();
        
        if (startFrame != 0 || duration != 0) {
            if (dialog->getSelectionOnly()) {
                context.startFrame = startFrame;
                context.duration = duration;
            }
        }

        dialog->getProcessingParameters(context.stepSize,
                                        context.blockSize,
                                        context.windowType);

        context.makeConsistentWithPlugin(plugin);

        delete dialog;

        if (effect && source) {
            source->setAuditioningPlugin(0); // will delete our plugin
        } else {
            delete plugin;
        }
    }

    if (ok) m_lastConfigurations[identifier] = configurationXml;

    return ok ? inputModel : 0;
}

PluginTransformer::ExecutionContext
ModelTransformerFactory::getDefaultContextForTransformer(TransformId identifier,
                                                Model *inputModel)
{
    PluginTransformer::ExecutionContext context(-1);

    QString id = identifier.section(':', 0, 2);

    if (FeatureExtractionPluginFactory::instanceFor(id)) {

        Vamp::Plugin *vp =
            FeatureExtractionPluginFactory::instanceFor(id)->instantiatePlugin
            (id, inputModel ? inputModel->getSampleRate() : 48000);

        if (vp) {
            context = PluginTransformer::ExecutionContext(-1, vp);
            delete vp;
        }
    }

    return context;
}

ModelTransformer *
ModelTransformerFactory::createTransformer(TransformId identifier, Model *inputModel,
                                  const PluginTransformer::ExecutionContext &context,
                                  QString configurationXml)
{
    ModelTransformer *transformer = 0;

    QString id = identifier.section(':', 0, 2);
    QString output = identifier.section(':', 3);

    if (FeatureExtractionPluginFactory::instanceFor(id)) {
        transformer = new FeatureExtractionModelTransformer(inputModel,
                                                            id,
                                                            context,
                                                            configurationXml,
                                                            output);
    } else if (RealTimePluginFactory::instanceFor(id)) {
        transformer = new RealTimeEffectModelTransformer(inputModel,
                                                         id,
                                                         context,
                                                         configurationXml,
                                                         getTransformerUnits(identifier),
                                                         output == "A" ? -1 :
                                                         output.toInt());
    } else {
        std::cerr << "ModelTransformerFactory::createTransformer: Unknown transform \""
                  << identifier.toStdString() << "\"" << std::endl;
        return transformer;
    }

    if (transformer) transformer->setObjectName(identifier);
    return transformer;
}

Model *
ModelTransformerFactory::transform(TransformId identifier, Model *inputModel,
                            const PluginTransformer::ExecutionContext &context,
                            QString configurationXml)
{
    ModelTransformer *t = createTransformer(identifier, inputModel, context,
                                            configurationXml);

    if (!t) return 0;

    connect(t, SIGNAL(finished()), this, SLOT(transformerFinished()));

    m_runningTransformers.insert(t);

    t->start();
    Model *model = t->detachOutputModel();

    if (model) {
        QString imn = inputModel->objectName();
        QString trn = getTransformerFriendlyName(identifier);
        if (imn != "") {
            if (trn != "") {
                model->setObjectName(tr("%1: %2").arg(imn).arg(trn));
            } else {
                model->setObjectName(imn);
            }
        } else if (trn != "") {
            model->setObjectName(trn);
        }
    } else {
        t->wait();
    }

    return model;
}

void
ModelTransformerFactory::transformerFinished()
{
    QObject *s = sender();
    ModelTransformer *transformer = dynamic_cast<ModelTransformer *>(s);
    
    std::cerr << "ModelTransformerFactory::transformerFinished(" << transformer << ")" << std::endl;

    if (!transformer) {
	std::cerr << "WARNING: ModelTransformerFactory::transformerFinished: sender is not a transformer" << std::endl;
	return;
    }

    if (m_runningTransformers.find(transformer) == m_runningTransformers.end()) {
        std::cerr << "WARNING: ModelTransformerFactory::transformerFinished(" 
                  << transformer
                  << "): I have no record of this transformer running!"
                  << std::endl;
    }

    m_runningTransformers.erase(transformer);

    transformer->wait(); // unnecessary but reassuring
    delete transformer;
}

void
ModelTransformerFactory::modelAboutToBeDeleted(Model *m)
{
    TransformerSet affected;

    for (TransformerSet::iterator i = m_runningTransformers.begin();
         i != m_runningTransformers.end(); ++i) {

        ModelTransformer *t = *i;

        if (t->getInputModel() == m || t->getOutputModel() == m) {
            affected.insert(t);
        }
    }

    for (TransformerSet::iterator i = affected.begin();
         i != affected.end(); ++i) {

        ModelTransformer *t = *i;

        t->abandon();

        t->wait(); // this should eventually call back on
                   // transformerFinished, which will remove from
                   // m_runningTransformers and delete.
    }
}