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/* lv2_data_access.h - C header file for the LV2 Data Access extension.
* Copyright (C) 2008 Dave Robillard <dave@drobilla.net>
*
* This header is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This header is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this header; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 01222-1307 USA
*/
#ifndef LV2_DATA_ACCESS_H
#define LV2_DATA_ACCESS_H
#define LV2_DATA_ACCESS_URI "http://lv2plug.in/ns/ext/data-access"
/** @file
* This header defines the LV2 Extension Data extension with the URI
* <http://lv2plug.in/ns/ext/data-access>.
*
* This extension defines a method for (e.g.) plugin UIs to have (possibly
* marshalled) access to the extension_data function on a plugin instance.
*/
/** The data field of the LV2_Feature for this extension.
*
* To support this feature the host must pass an LV2_Feature struct to the
* instantiate method with URI "http://lv2plug.in/ns/ext/data-access"
* and data pointed to an instance of this struct.
*/
typedef struct {
/** A pointer to a method the UI can call to get data (of a type specified
* by some other extension) from the plugin.
*
* This call never is never guaranteed to return anything, UIs should
* degrade gracefully if direct access to the plugin data is not possible
* (in which case this function will return NULL).
*
* This is for access to large data that can only possibly work if the UI
* and plugin are running in the same process. For all other things, use
* the normal LV2 UI communication system.
*/
const void* (*data_access)(const char* uri);
} LV2_Extension_Data_Feature;
#endif // LV2_DATA_ACCESS_H
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