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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/urid.h @ 6:542e305f23f4

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author prymula <prymula76@outlook.com>
date Wed, 31 Jan 2024 20:40:57 +0100
parents 84e66ea83026
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1 /*
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2 Copyright 2008-2016 David Robillard <http://drobilla.net>
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3 Copyright 2011 Gabriel M. Beddingfield <gabrbedd@gmail.com>
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4
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5 Permission to use, copy, modify, and/or distribute this software for any
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6 purpose with or without fee is hereby granted, provided that the above
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7 copyright notice and this permission notice appear in all copies.
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8
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9 THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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10 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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11 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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12 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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13 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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14 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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15 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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16 */
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17
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18 /**
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19 @defgroup urid URID
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20
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21 Features for mapping URIs to and from integers, see
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22 <http://lv2plug.in/ns/ext/urid> for details.
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23
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24 @{
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25 */
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26
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27 #ifndef LV2_URID_H
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28 #define LV2_URID_H
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29
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30 #define LV2_URID_URI "http://lv2plug.in/ns/ext/urid" ///< http://lv2plug.in/ns/ext/urid
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31 #define LV2_URID_PREFIX LV2_URID_URI "#" ///< http://lv2plug.in/ns/ext/urid#
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32
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33 #define LV2_URID__map LV2_URID_PREFIX "map" ///< http://lv2plug.in/ns/ext/urid#map
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34 #define LV2_URID__unmap LV2_URID_PREFIX "unmap" ///< http://lv2plug.in/ns/ext/urid#unmap
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35
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36 #define LV2_URID_MAP_URI LV2_URID__map ///< Legacy
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37 #define LV2_URID_UNMAP_URI LV2_URID__unmap ///< Legacy
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38
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39 #include <stdint.h>
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40
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41 #ifdef __cplusplus
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42 extern "C" {
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43 #endif
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44
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45 /**
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46 Opaque pointer to host data for LV2_URID_Map.
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47 */
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48 typedef void* LV2_URID_Map_Handle;
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49
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50 /**
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51 Opaque pointer to host data for LV2_URID_Unmap.
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52 */
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53 typedef void* LV2_URID_Unmap_Handle;
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54
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55 /**
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56 URI mapped to an integer.
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57 */
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58 typedef uint32_t LV2_URID;
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59
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60 /**
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61 URID Map Feature (LV2_URID__map)
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62 */
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63 typedef struct _LV2_URID_Map {
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64 /**
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65 Opaque pointer to host data.
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66
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67 This MUST be passed to map_uri() whenever it is called.
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68 Otherwise, it must not be interpreted in any way.
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69 */
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70 LV2_URID_Map_Handle handle;
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71
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72 /**
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73 Get the numeric ID of a URI.
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74
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75 If the ID does not already exist, it will be created.
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76
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77 This function is referentially transparent; any number of calls with the
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78 same arguments is guaranteed to return the same value over the life of a
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79 plugin instance. Note, however, that several URIs MAY resolve to the
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80 same ID if the host considers those URIs equivalent.
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81
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82 This function is not necessarily very fast or RT-safe: plugins SHOULD
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83 cache any IDs they might need in performance critical situations.
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84
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85 The return value 0 is reserved and indicates that an ID for that URI
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86 could not be created for whatever reason. However, hosts SHOULD NOT
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87 return 0 from this function in non-exceptional circumstances (i.e. the
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88 URI map SHOULD be dynamic).
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89
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90 @param handle Must be the callback_data member of this struct.
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91 @param uri The URI to be mapped to an integer ID.
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92 */
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93 LV2_URID (*map)(LV2_URID_Map_Handle handle,
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94 const char* uri);
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95 } LV2_URID_Map;
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96
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97 /**
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98 URI Unmap Feature (LV2_URID__unmap)
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99 */
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100 typedef struct _LV2_URID_Unmap {
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101 /**
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102 Opaque pointer to host data.
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103
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104 This MUST be passed to unmap() whenever it is called.
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105 Otherwise, it must not be interpreted in any way.
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106 */
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107 LV2_URID_Unmap_Handle handle;
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108
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109 /**
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110 Get the URI for a previously mapped numeric ID.
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111
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112 Returns NULL if `urid` is not yet mapped. Otherwise, the corresponding
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113 URI is returned in a canonical form. This MAY not be the exact same
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114 string that was originally passed to LV2_URID_Map::map(), but it MUST be
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115 an identical URI according to the URI syntax specification (RFC3986). A
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116 non-NULL return for a given `urid` will always be the same for the life
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117 of the plugin. Plugins that intend to perform string comparison on
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118 unmapped URIs SHOULD first canonicalise URI strings with a call to
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119 map_uri() followed by a call to unmap_uri().
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120
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121 @param handle Must be the callback_data member of this struct.
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122 @param urid The ID to be mapped back to the URI string.
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123 */
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124 const char* (*unmap)(LV2_URID_Unmap_Handle handle,
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125 LV2_URID urid);
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126 } LV2_URID_Unmap;
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127
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128 #ifdef __cplusplus
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129 } /* extern "C" */
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130 #endif
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131
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132 #endif /* LV2_URID_H */
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133
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134 /**
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135 @}
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136 */