annotate vamp-hostsdk/PluginConfiguration.h @ 428:4912b698f3f7 vampipe

Configuration request/response structs

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

/*
    Vamp

    An API for audio analysis and feature extraction plugins.

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

#ifndef VAMP_PLUGIN_CONFIGURATION_H
#define VAMP_PLUGIN_CONFIGURATION_H

#include "hostguard.h"

#include "Plugin.h"

#include <map>
#include <string>

_VAMP_SDK_HOSTSPACE_BEGIN(PluginConfiguration.h)

namespace Vamp {

namespace HostExt {

/**
 * \class PluginConfiguration PluginConfiguration.h <vamp-hostsdk/PluginConfiguration.h>
 * 
 * Vamp::HostExt::PluginConfiguration is a structure bundling together
 * data that affect the configuration of a plugin: parameter values,
 * programs, and initialisation settings. Although an interactive Vamp
 * plugin host may configure a plugin in stages, for example to take
 * into account that a plugin's preferred step and block size may
 * change when its parameters are changed, a batch host or a host
 * supporting store and recall of configurations may wish to keep all
 * configuration settings together.
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK.
 */
struct PluginConfiguration
{
    PluginConfiguration() : // invalid configuration by default
	channelCount(0), stepSize(0), blockSize(0) { }
	
    int channelCount;
    int stepSize;
    int blockSize;
    typedef std::map<std::string, float> ParameterMap;
    ParameterMap parameterValues;
    std::string currentProgram;

    static PluginConfiguration
    fromPlugin(Plugin *p,
	       int channelCount,
	       int stepSize,
	       int blockSize) {
	
	PluginConfiguration c;
	
	c.channelCount = channelCount;
	c.stepSize = stepSize;
	c.blockSize = blockSize;

	PluginBase::ParameterList params = p->getParameterDescriptors();
	for (PluginBase::ParameterList::const_iterator i = params.begin();
	     i != params.end(); ++i) {
	    std::string pid = i->identifier;
	    c.parameterValues[pid] = p->getParameter(pid);
	}
	
	if (!p->getPrograms().empty()) {
	    c.currentProgram = p->getCurrentProgram();
	}

	return c;
    }
};

/**
 * \class ConfigurationRequest PluginConfiguration.h <vamp-hostsdk/PluginConfiguration.h>
 * 
 * A wrapper for a plugin pointer and PluginConfiguration, bundling up
 * the data needed to configure a plugin after it has been loaded.
 *
 * \see PluginConfiguration, ConfigurationResponse, LoadRequest, LoadResponse
 */
struct ConfigurationRequest
{
public:
    ConfigurationRequest() : // invalid request by default
	plugin(0) { }

    Plugin *plugin;
    PluginConfiguration configuration;
};

/**
 * \class ConfigurationResponse PluginConfiguration.h <vamp-hostsdk/PluginConfiguration.h>
 *
 * The return value from a configuration request (i.e. setting the
 * parameters and initialising the plugin). If the configuration was
 * successful, the output list will contain the final
 * post-initialisation output descriptors. If configuration failed,
 * the output list will be empty.
 *
 * \see PluginConfiguration, ConfigurationRequest, LoadRequest, LoadResponse
 */
struct ConfigurationResponse
{
public:
    ConfigurationResponse() // failed by default
    { }

    Plugin::OutputList outputs;
};

}

}

_VAMP_SDK_HOSTSPACE_END(PluginConfiguration.h)

#endif