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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/options.h @ 3:84e66ea83026
DPF-Prymula-audioplugins-0.231015-2
author | prymula <prymula76@outlook.com> |
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date | Mon, 16 Oct 2023 21:53:34 +0200 |
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1 /* |
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2 Copyright 2012-2016 David Robillard <http://drobilla.net> |
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3 |
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4 Permission to use, copy, modify, and/or distribute this software for any |
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5 purpose with or without fee is hereby granted, provided that the above |
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6 copyright notice and this permission notice appear in all copies. |
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7 |
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8 THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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9 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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10 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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11 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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12 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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13 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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14 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 */ |
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16 |
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17 /** |
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18 @defgroup options Options |
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19 |
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20 Instantiation time options, see <http://lv2plug.in/ns/ext/options> for |
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21 details. |
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22 |
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23 @{ |
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24 */ |
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25 |
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26 #ifndef LV2_OPTIONS_H |
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27 #define LV2_OPTIONS_H |
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28 |
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29 #include <stdint.h> |
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30 |
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31 #include "urid.h" |
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32 #include "lv2.h" |
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33 |
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34 #define LV2_OPTIONS_URI "http://lv2plug.in/ns/ext/options" ///< http://lv2plug.in/ns/ext/options |
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35 #define LV2_OPTIONS_PREFIX LV2_OPTIONS_URI "#" ///< http://lv2plug.in/ns/ext/options# |
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36 |
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37 #define LV2_OPTIONS__Option LV2_OPTIONS_PREFIX "Option" ///< http://lv2plug.in/ns/ext/options#Option |
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38 #define LV2_OPTIONS__interface LV2_OPTIONS_PREFIX "interface" ///< http://lv2plug.in/ns/ext/options#interface |
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39 #define LV2_OPTIONS__options LV2_OPTIONS_PREFIX "options" ///< http://lv2plug.in/ns/ext/options#options |
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40 #define LV2_OPTIONS__requiredOption LV2_OPTIONS_PREFIX "requiredOption" ///< http://lv2plug.in/ns/ext/options#requiredOption |
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41 #define LV2_OPTIONS__supportedOption LV2_OPTIONS_PREFIX "supportedOption" ///< http://lv2plug.in/ns/ext/options#supportedOption |
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42 |
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43 #ifdef __cplusplus |
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44 extern "C" { |
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45 #endif |
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46 |
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47 /** |
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48 The context of an Option, which defines the subject it applies to. |
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49 */ |
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50 typedef enum { |
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51 /** |
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52 This option applies to the instance itself. The subject must be |
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53 ignored. |
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54 */ |
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55 LV2_OPTIONS_INSTANCE, |
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56 |
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57 /** |
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58 This option applies to some named resource. The subject is a URI mapped |
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59 to an integer (a LV2_URID, like the key) |
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60 */ |
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61 LV2_OPTIONS_RESOURCE, |
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62 |
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63 /** |
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64 This option applies to some blank node. The subject is a blank node |
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65 identifier, which is valid only within the current local scope. |
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66 */ |
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67 LV2_OPTIONS_BLANK, |
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68 |
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69 /** |
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70 This option applies to a port on the instance. The subject is the |
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71 port's index. |
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72 */ |
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73 LV2_OPTIONS_PORT |
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74 } LV2_Options_Context; |
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75 |
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76 /** |
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77 An option. |
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78 |
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79 This is a property with a subject, also known as a triple or statement. |
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80 |
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81 This struct is useful anywhere a statement needs to be passed where no |
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82 memory ownership issues are present (since the value is a const pointer). |
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83 |
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84 Options can be passed to an instance via the feature LV2_OPTIONS__options |
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85 with data pointed to an array of options terminated by a zeroed option, or |
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86 accessed/manipulated using LV2_Options_Interface. |
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87 */ |
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88 typedef struct _LV2_Options_Option { |
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89 LV2_Options_Context context; /**< Context (type of subject). */ |
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90 uint32_t subject; /**< Subject. */ |
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91 LV2_URID key; /**< Key (property). */ |
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92 uint32_t size; /**< Size of value in bytes. */ |
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93 LV2_URID type; /**< Type of value (datatype). */ |
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94 const void* value; /**< Pointer to value (object). */ |
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95 } LV2_Options_Option; |
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96 |
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97 /** A status code for option functions. */ |
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98 typedef enum { |
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99 LV2_OPTIONS_SUCCESS = 0, /**< Completed successfully. */ |
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100 LV2_OPTIONS_ERR_UNKNOWN = 1, /**< Unknown error. */ |
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101 LV2_OPTIONS_ERR_BAD_SUBJECT = 1 << 1, /**< Invalid/unsupported subject. */ |
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102 LV2_OPTIONS_ERR_BAD_KEY = 1 << 2, /**< Invalid/unsupported key. */ |
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103 LV2_OPTIONS_ERR_BAD_VALUE = 1 << 3 /**< Invalid/unsupported value. */ |
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104 } LV2_Options_Status; |
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105 |
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106 /** |
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107 Interface for dynamically setting options (LV2_OPTIONS__interface). |
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108 */ |
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109 typedef struct _LV2_Options_Interface { |
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110 /** |
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111 Get the given options. |
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112 |
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113 Each element of the passed options array MUST have type, subject, and |
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114 key set. All other fields (size, type, value) MUST be initialised to |
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115 zero, and are set to the option value if such an option is found. |
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116 |
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117 This function is in the "instantiation" LV2 threading class, so no other |
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118 instance functions may be called concurrently. |
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119 |
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120 @return Bitwise OR of LV2_Options_Status values. |
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121 */ |
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122 uint32_t (*get)(LV2_Handle instance, |
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123 LV2_Options_Option* options); |
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124 |
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125 /** |
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126 Set the given options. |
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127 |
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128 This function is in the "instantiation" LV2 threading class, so no other |
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129 instance functions may be called concurrently. |
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130 |
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131 @return Bitwise OR of LV2_Options_Status values. |
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132 */ |
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133 uint32_t (*set)(LV2_Handle instance, |
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134 const LV2_Options_Option* options); |
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135 } LV2_Options_Interface; |
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136 |
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137 #ifdef __cplusplus |
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138 } /* extern "C" */ |
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139 #endif |
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140 |
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141 #endif /* LV2_OPTIONS_H */ |
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142 |
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143 /** |
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144 @} |
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145 */ |