annotate bits/PluginOutputIdMapper.h @ 49:f3f7561233d6

Begin plugin output id / index mapping for use in feature sets

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Vampipe

    Centre for Digital Music, Queen Mary, University of London.
    Copyright 2006-2016 Chris Cannam and QMUL.
  
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*/

#ifndef VAMPIPE_PLUGIN_ID_MAPPER_H
#define VAMPIPE_PLUGIN_ID_MAPPER_H

#include <vamp-hostsdk/Plugin.h>

#include <map>
#include <string>

namespace vampipe {

class PluginOutputIdMapper
{
// NB not threadsafe. Does this matter?

//!!! simplify. A single vector is almost certainly faster.
    
public:
    PluginOutputIdMapper(Vamp::Plugin *p) : m_plugin(p) { }

    class NotFound : virtual public std::runtime_error {
    public:
        NotFound() : runtime_error("output id or index not found in mapper") { }
    };

    int idToIndex(std::string outputId) const {
	if (m_idIndexMap.empty()) populate();
	auto i = m_idIndexMap.find(outputId);
	if (i == m_idIndexMap.end()) throw NotFound();
	return i->second;
    }

    std::string indexToId(int index) const {
	if (m_ids.empty()) populate();
	if (index < 0 || size_t(index) >= m_ids.size()) throw NotFound();
	return m_ids[index];
    }

private:
    Vamp::Plugin *m_plugin;
    mutable std::vector<std::string> m_ids;
    mutable std::map<std::string, int> m_idIndexMap;

    void populate() const {
	Vamp::Plugin::OutputList outputs = m_plugin->getOutputDescriptors();
	for (const auto &d: outputs) {
	    m_idIndexMap[d.identifier] = m_ids.size();
	    m_ids.push_back(d.identifier);
	}
    }
};

}

#endif