1 /* lv2_uri_unmap.h - C header file for the LV2 URI Unmap extension.
3 * Copyright (C) 2010 David Robillard <http://drobilla.net>
5 * This header is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU Lesser General Public License as published
7 * by the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This header is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
13 * License for more details.
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this header; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place, Suite 330, Boston, MA 01222-1307 USA
21 * C header for the LV2 URI Map extension <http://lv2plug.in/ns/ext/uri-unmap>.
24 #ifndef LV2_URI_UNMAP_H
25 #define LV2_URI_UNMAP_H
27 #define LV2_URI_UNMAP_URI "http://lv2plug.in/ns/ext/uri-unmap"
32 /** Opaque pointer to host data. */
33 typedef void* LV2_URI_Unmap_Callback_Data;
36 /** The data field of the LV2_Feature for the URI Unmap extension.
38 * To support this extension the host must pass an LV2_Feature struct to the
39 * plugin's instantiate method with URI "http://lv2plug.in/ns/ext/uri-unmap"
40 * and data pointed to an instance of this struct.
44 /** Opaque pointer to host data.
46 * The plugin MUST pass this to any call to functions in this struct.
47 * Otherwise, it must not be interpreted in any way.
49 LV2_URI_Unmap_Callback_Data callback_data;
51 /** Get the numeric ID of a URI from the host.
53 * @param callback_data Must be the callback_data member of this struct.
54 * @param map The 'context' used to map this URI.
55 * @param id The URI ID to unmap.
56 * @return The string form of @a id, or NULL on error.
58 * The @a id MUST be a value previously returned from
59 * LV2_Uri_Map_Feature.uri_to_id.
61 * The returned string is owned by the host and MUST NOT be freed by
62 * the plugin or stored for a long period of time (e.g. across run
63 * invocations) without copying.
65 * This function is referentially transparent - any number of calls with
66 * the same arguments is guaranteed to return the same value over the life
67 * of a plugin instance (though the same ID may return different values
68 * with a different map parameter).
70 * This function may be called from any non-realtime thread, possibly
71 * concurrently (hosts may simply use a mutex to meet these requirements).
73 const char* (*id_to_uri)(LV2_URI_Unmap_Callback_Data callback_data,
77 } LV2_URI_Unmap_Feature;
80 #endif /* LV2_URI_UNMAP_H */