aboutsummaryrefslogtreecommitdiffstats
path: root/ext
diff options
context:
space:
mode:
authorDavid Robillard <d@drobilla.net>2011-03-26 00:33:02 +0000
committerDavid Robillard <d@drobilla.net>2011-03-26 00:33:02 +0000
commita77f2c7c0f126bccdd44c6a98b305ad5a6c50f84 (patch)
tree3e668a3234440dc02b4c4c8762302dde238f09a6 /ext
parent04f5aa77d390a84ef9b353d2454c3e93d99cc470 (diff)
downloadlv2-a77f2c7c0f126bccdd44c6a98b305ad5a6c50f84.tar.xz
Clarify intended dynamic purpose of extension.
Clarify that extensions SHOULD NOT define a context unless it is absolutely necessary. Use standard code style.
Diffstat (limited to 'ext')
-rw-r--r--ext/uri-map.lv2/uri-map.h137
1 files changed, 72 insertions, 65 deletions
diff --git a/ext/uri-map.lv2/uri-map.h b/ext/uri-map.lv2/uri-map.h
index d0d04e4..296095b 100644
--- a/ext/uri-map.lv2/uri-map.h
+++ b/ext/uri-map.lv2/uri-map.h
@@ -1,33 +1,33 @@
-/* lv2_uri_map.h - C header file for the LV2 URI Map extension.
- *
- * Copyright (C) 2008-2009 David Robillard <http://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
- */
+/*
+ Copyright (C) 2008-2011 David Robillard <http://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
+*/
-/** @file
- * C header for the LV2 URI Map extension <http://lv2plug.in/ns/ext/uri-map>.
- *
- * This extension defines a simple mechanism for plugins to map URIs to
- * integers, usually for performance reasons (e.g. processing events
- * typed by URIs in real time). The expected use case is for plugins to
- * map URIs to integers for things they 'understand' at instantiation time,
- * and store those values for use in the audio thread without doing any string
- * comparison. This allows the extensibility of RDF with the performance of
- * integers (or centrally defined enumerations).
- */
+/**
+ @file
+ C header for the LV2 URI Map extension <http://lv2plug.in/ns/ext/uri-map>.
+
+ This extension defines a simple mechanism for plugins to map URIs to
+ integers, usually for performance reasons (e.g. processing events typed by
+ URIs in real time). The expected use case is for plugins to map URIs to
+ integers for things they 'understand' at instantiation time, and store those
+ values for use in the audio thread without doing any string comparison.
+ This allows the extensibility of RDF with the performance of integers (or
+ centrally defined enumerations).
+*/
#ifndef LV2_URI_MAP_H
#define LV2_URI_MAP_H
@@ -36,52 +36,59 @@
#include <stdint.h>
-
-/** Opaque pointer to host data. */
+/**
+ Opaque pointer to host data.
+*/
typedef void* LV2_URI_Map_Callback_Data;
-
-/** The data field of the LV2_Feature for this extension.
- *
- * To support this feature the host must pass an LV2_Feature struct to the
- * plugin's instantiate method with URI "http://lv2plug.in/ns/ext/uri-map"
- * and data pointed to an instance of this struct.
- */
+/**
+ URI Map Feature.
+
+ To support this feature the host must pass an LV2_Feature struct to the
+ plugin's instantiate method with URI "http://lv2plug.in/ns/ext/uri-map"
+ and data pointed to an instance of this struct.
+*/
typedef struct {
- /** Opaque pointer to host data.
- *
- * The plugin MUST pass this to any call to functions in this struct.
- * Otherwise, it must not be interpreted in any way.
- */
+ /**
+ Opaque pointer to host data.
+
+ The plugin MUST pass this to any call to functions in this struct.
+ Otherwise, it must not be interpreted in any way.
+ */
LV2_URI_Map_Callback_Data callback_data;
- /** Get the numeric ID of a URI from the host.
- *
- * @param callback_data Must be the callback_data member of this struct.
- * @param map The 'context' of this URI. Certain extensions may define a
- * URI that must be passed here with certain restrictions on the
- * return value (e.g. limited range). This value may be NULL if
- * the plugin needs an ID for a URI in general.
- * @param uri The URI to be mapped to an integer ID.
- *
- * This function is referentially transparent - any number of calls with
- * the same arguments is guaranteed to return the same value over the life
- * of a plugin instance (though the same URI may return different values
- * with a different map parameter). However, this function is not
- * necessarily very fast: plugins should cache any IDs they might need in
- * performance critical situations.
- * The return value 0 is reserved and means an ID for that URI could not
- * be created for whatever reason. Extensions may define more precisely
- * what this means, but in general plugins should gracefully handle 0
- * and consider whatever they wanted the URI for "unsupported".
- */
+ /**
+ Get the numeric ID of a URI from the host.
+
+ @param callback_data Must be the callback_data member of this struct.
+ @param map The 'context' of this URI. Certain extensions may define a
+ URI that must be passed here with certain restrictions on the return
+ value (e.g. limited range). This value may be NULL if the plugin needs
+ an ID for a URI in general. Extensions SHOULD NOT define a context
+ unless there is a specific need to do so, e.g. to restrict the range of
+ the returned value.
+ @param uri The URI to be mapped to an integer ID.
+
+ This function is referentially transparent; any number of calls with the
+ same arguments is guaranteed to return the same value over the life of a
+ plugin instance (though the same URI may return different values with a
+ different map parameter). However, this function is not necessarily very
+ fast: plugins SHOULD cache any IDs they might need in performance
+ critical situations.
+
+ The return value 0 is reserved and indicates that an ID for that URI
+ could not be created for whatever reason. Extensions MAY define more
+ precisely what this means in a certain context, but in general plugins
+ SHOULD handle this situation as gracefully as possible. However, hosts
+ SHOULD NOT return 0 from this function in non-exceptional circumstances
+ (e.g. the URI map SHOULD be dynamic). Hosts that statically support only
+ a fixed set of URIs should not expect plugins to function correctly.
+ */
uint32_t (*uri_to_id)(LV2_URI_Map_Callback_Data callback_data,
const char* map,
const char* uri);
} LV2_URI_Map_Feature;
-
#endif /* LV2_URI_MAP_H */
-