1 /* 2 LV2 Data Access Extension 3 Copyright 2008-2011 David Robillard <http://drobilla.net> 4 5 Permission to use, copy, modify, and/or distribute this software for any 6 purpose with or without fee is hereby granted, provided that the above 7 copyright notice and this permission notice appear in all copies. 8 9 THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /** 19 @file data-access.h 20 C header for the LV2 Extension Data extension 21 <http://lv2plug.in/ns/ext/data-access>. 22 23 This extension defines a method for (e.g.) plugin UIs to have (possibly 24 marshalled) access to the extension_data function on a plugin instance. 25 */ 26 27 #ifndef LV2_DATA_ACCESS_H 28 #define LV2_DATA_ACCESS_H 29 30 #define LV2_DATA_ACCESS_URI "http://lv2plug.in/ns/ext/data-access" 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 /** 37 The data field of the LV2_Feature for this extension. 38 39 To support this feature the host must pass an LV2_Feature struct to the 40 instantiate method with URI "http://lv2plug.in/ns/ext/data-access" 41 and data pointed to an instance of this struct. 42 */ 43 typedef struct { 44 /** 45 A pointer to a method the UI can call to get data (of a type specified 46 by some other extension) from the plugin. 47 48 This call never is never guaranteed to return anything, UIs should 49 degrade gracefully if direct access to the plugin data is not possible 50 (in which case this function will return NULL). 51 52 This is for access to large data that can only possibly work if the UI 53 and plugin are running in the same process. For all other things, use 54 the normal LV2 UI communication system. 55 */ 56 const void* (*data_access)(const char* uri); 57 } LV2_Extension_Data_Feature; 58 59 #ifdef __cplusplus 60 } /* extern "C" */ 61 #endif 62 63 #endif /* LV2_DATA_ACCESS_H */ 64