annotate vamp-support/AssignedPluginHandleMapper.h @ 185:3eb00e5c76c4

Pull step & block size out into framing struct, return in config

Update the C++ code to separate out the framing parameters (step and
block size) from the configuration structure into their own structure,
as in the latest schema, and to return the accepted framing params in
the configuration response.

This also implies that the plugin stub (which adapts Piper API
back to Vamp) makes a note of the returned values,
making them available via its own getPreferredStep/BlockSize
so that the host can retry the initialise call in the case where it
failed for having the wrong values first time.

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

/*
    Piper C++

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

#ifndef PIPER_ASSIGNED_PLUGIN_HANDLE_MAPPER_H
#define PIPER_ASSIGNED_PLUGIN_HANDLE_MAPPER_H

#include "PluginHandleMapper.h"
#include "PluginOutputIdMapper.h"
#include "DefaultPluginOutputIdMapper.h"

#include <set>
#include <map>
#include <iostream>

namespace piper_vamp {

class AssignedPluginHandleMapper : public PluginHandleMapper
{
public:
    AssignedPluginHandleMapper() { }

    void addPlugin(Handle h, Vamp::Plugin *p) {
        if (!p) return;
	if (m_rplugins.find(p) == m_rplugins.end()) {
            if (m_plugins.find(h) != m_plugins.end()) {
                std::cerr << "ERROR: Duplicate plugin handle " << h
                          << " for plugin " << p << " (already used for plugin "
                          << m_plugins[h] << ")" << std::endl;
                throw std::logic_error("Duplicate plugin handle");
            }
	    m_plugins[h] = p;
	    m_rplugins[p] = h;
            m_outputMappers[h] =
                std::make_shared<DefaultPluginOutputIdMapper>(p);
	}
    }

    void removePlugin(Handle h) {
	if (m_plugins.find(h) == m_plugins.end()) return;
	Vamp::Plugin *p = m_plugins[h];
        m_outputMappers.erase(h);
	m_plugins.erase(h);
	if (isConfigured(h)) {
	    m_configuredPlugins.erase(h);
	    m_channelCounts.erase(h);
	}
	m_rplugins.erase(p);
    }

    bool havePlugin(Vamp::Plugin *p) {
        return (m_rplugins.find(p) != m_rplugins.end());
    }
    
    Handle pluginToHandle(Vamp::Plugin *p) const noexcept {
	if (m_rplugins.find(p) == m_rplugins.end()) {
            return INVALID_HANDLE;
	}
	return m_rplugins.at(p);
    }
    
    Vamp::Plugin *handleToPlugin(Handle h) const noexcept {
	if (m_plugins.find(h) == m_plugins.end()) {
            return nullptr;
	}
	return m_plugins.at(h);
    }

    const std::shared_ptr<PluginOutputIdMapper> pluginToOutputIdMapper
    (Vamp::Plugin *p) const noexcept {
        return handleToOutputIdMapper(pluginToHandle(p));
    }

    const std::shared_ptr<PluginOutputIdMapper> handleToOutputIdMapper
    (Handle h) const noexcept {
	if (h != INVALID_HANDLE &&
            m_outputMappers.find(h) != m_outputMappers.end()) {
            return m_outputMappers.at(h);
        } else {
	    return {};
	}
    }

    bool isConfigured(Handle h) const noexcept {
        if (h == INVALID_HANDLE) return false;
	return m_configuredPlugins.find(h) != m_configuredPlugins.end();
    }

    void markConfigured(Handle h, int channelCount, int blockSize) {
        if (h == INVALID_HANDLE) return;
	m_configuredPlugins.insert(h);
	m_channelCounts[h] = channelCount;
	m_blockSizes[h] = blockSize;
    }

    int getChannelCount(Handle h) const noexcept {
	if (m_channelCounts.find(h) == m_channelCounts.end()) {
	    return 0;
	}
	return m_channelCounts.at(h);
    }

    int getBlockSize(Handle h) const noexcept {
	if (m_blockSizes.find(h) == m_blockSizes.end()) {
            return 0;
	}
	return m_blockSizes.at(h);
    }
    
private:
    std::map<Handle, Vamp::Plugin *> m_plugins;
    std::map<Vamp::Plugin *, Handle> m_rplugins;
    std::set<Handle> m_configuredPlugins;
    std::map<Handle, int> m_channelCounts;
    std::map<Handle, int> m_blockSizes;
    std::map<Handle, std::shared_ptr<PluginOutputIdMapper>> m_outputMappers;
};

}

#endif