annotate vamp-hostsdk/RequestResponse.h @ 455:5c07a86abddd outputid-string-in-featureset

Make RequestResponse types more consistent by adding plugin to ConfigurationResponse and introducing a FinishRequest

/* -*- 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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    obtaining a copy of this software and associated documentation
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    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be
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    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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    Except as contained in this notice, the names of the Centre for
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    shall not be used in advertising or otherwise to promote the sale,
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*/

#ifndef VAMP_REQUEST_RESPONSE_H
#define VAMP_REQUEST_RESPONSE_H

#include "PluginStaticData.h"
#include "PluginConfiguration.h"

#include "hostguard.h"

#include <map>
#include <string>

_VAMP_SDK_HOSTSPACE_BEGIN(RequestResponse.h)

namespace Vamp {

class Plugin;

namespace HostExt {

/**
 * \class LoadRequest RequestResponse.h <vamp-hostsdk/RequestResponse.h>
 * 
 * Vamp::HostExt::LoadRequest is a structure containing the
 * information necessary to load a plugin. When a request is made to
 * load a plugin using a LoadRequest, the response is typically
 * returned in a LoadResponse structure.
 *
 * \see LoadResponse
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, along with the PluginLoader method that accepts this structure
 * rather than accepting its elements individually.
 */
struct LoadRequest
{
    LoadRequest() : // invalid request by default
	inputSampleRate(0.f),
	adapterFlags(0) { }

    /**
     * PluginKey is a string type that is used to identify a plugin
     * uniquely within the scope of "the current system". For further
     * details \see PluginLoader::PluginKey.
     */
    typedef std::string PluginKey;

    /**
     * The identifying key for the plugin to be loaded.
     */
    PluginKey pluginKey;

    /**
     * Sample rate to be passed to the plugin's constructor.
     */
    float inputSampleRate;

    /** 
     * A bitwise OR of the values in the PluginLoader::AdapterFlags
     * enumeration, indicating under which circumstances an adapter
     * should be used to wrap the original plugin.  If adapterFlags is
     * 0, no optional adapters will be used.
     *
     * \see PluginLoader::AdapterFlags, PluginLoader::loadPlugin
     */
    int adapterFlags;
};

/**
 * \class LoadResponse RequestResponse.h <vamp-hostsdk/RequestResponse.h>
 * 
 * Vamp::HostExt::LoadResponse is a structure containing the
 * information returned by PluginLoader when asked to load a plugin
 * using a LoadRequest.
 *
 * If the plugin could not be loaded, the plugin field will be 0.
 *
 * The caller takes ownership of the plugin contained here, which
 * should be deleted (using the standard C++ delete keyword) after
 * use.
 *
 * \see LoadRequest
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, along with the PluginLoader method that returns this structure.
 */
struct LoadResponse
{
    LoadResponse() : // invalid (failed) response by default
	plugin(0) { }

    /**
     * A pointer to the loaded plugin, or 0 if loading failed. Caller
     * takes ownership of the plugin and must delete it after use.
     */
    Plugin *plugin;

    /**
     * The static data associated with the loaded plugin, that is, all
     * information about it that does not depend on its configuration
     * (parameters, programs, initialisation parameters). The contents
     * of this structure are only valid if plugin is non-0.
     *
     * Much of the data in here is duplicated with the plugin itself.
     */
    PluginStaticData staticData;

    /**
     * The default configuration for this plugin, that is, default
     * values for parameters etc. The contents of this structure are
     * only valid if plugin is non-0.
     */
    PluginConfiguration defaultConfiguration;
};

/**
 * \class ConfigurationRequest RequestResponse.h <vamp-hostsdk/RequestResponse.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
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, along with the PluginLoader method that returns this structure.
 */
struct ConfigurationRequest
{
public:
    ConfigurationRequest() : // invalid request by default
	plugin(0) { }

    Plugin *plugin;
    PluginConfiguration configuration;
};

/**
 * \class ConfigurationResponse RequestResponse.h <vamp-hostsdk/RequestResponse.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
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, along with the PluginLoader method that returns this structure.
 */
struct ConfigurationResponse
{
public:
    ConfigurationResponse() : // failed by default
        plugin(0) { }

    Plugin *plugin;
    Plugin::OutputList outputs;
};

/**
 * \class ProcessRequest RequestResponse.h <vamp-hostsdk/RequestResponse.h>
 *
 * A structure that bundles the necessary data for making a process
 * call: plugin, input buffers, and timestamp. Caller retains
 * ownership of the plugin, but the buffers are passed "by value" to
 * avoid ownership concerns. 
 *
 * \see Plugin::process()
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, but it is not currently used by the SDK. It is supplied as a
 * convenience for code using the SDK, and for symmetry with the load
 * and configuration request structs.
 */
struct ProcessRequest
{
public:
    ProcessRequest() : // invalid by default
        plugin(0) { }

    Plugin *plugin;
    std::vector<std::vector<float> > inputBuffers;
    RealTime timestamp;
};

/**
 * \class ProcessResponse RequestResponse.h <vamp-hostsdk/RequestResponse.h>
 *
 * A structure that bundles the data returned by a process call and by
 * Plugin::getRemainingFeatures(). This is simply a FeatureSet
 * wrapper that happens to reference the plugin as well.
 *
 * \see Plugin::process(), Plugin::getRemainingFeatures()
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, but it is not currently used by the SDK. It is supplied as a
 * convenience for code using the SDK, and for symmetry with the load
 * and configuration request structs.
 */
struct ProcessResponse
{
public:
    ProcessResponse() : // invalid by default
        plugin(0) { }

    Plugin *plugin;
    Plugin::FeatureSet features;
};

/**
 * \class FinishRequest RequestResponse.h <vamp-hostsdk/RequestResponse.h>
 *
 * A structure that bundles the necessary data for finishing
 * processing, i.e. calling getRemainingFeatures(). This consists only
 * of the plugin pointer. Caller retains ownership of the plugin.
 *
 * \see Plugin::getRemainingFeatures()
 *
 * \note This class was introduced in version 2.7 of the Vamp plugin
 * SDK, but it is not currently used by the SDK. It is supplied as a
 * convenience for code using the SDK, and for symmetry with the load
 * and configuration request structs.
 *
 * \note The response to a finish request (getRemainingFeatures()) is
 * a ProcessResponse, just as it is for a process request.
 */
struct FinishRequest
{
public:
    FinishRequest() : // invalid by default
        plugin(0) { }

    Plugin *plugin;
};

}

}

_VAMP_SDK_HOSTSPACE_END(RequestResponse.h)

#endif