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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/worker.h @ 4:0962f0296c8a

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author prymula <prymula76@outlook.com>
date Tue, 30 Jan 2024 16:43:10 +0100
parents 84e66ea83026
children
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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 worker Worker
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19
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20 Support for non-realtime plugin operations, see
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21 <http://lv2plug.in/ns/ext/worker> for 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_WORKER_H
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27 #define LV2_WORKER_H
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28
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29 #include <stdint.h>
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31 #include "lv2.h"
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32
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33 #define LV2_WORKER_URI "http://lv2plug.in/ns/ext/worker" ///< http://lv2plug.in/ns/ext/worker
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34 #define LV2_WORKER_PREFIX LV2_WORKER_URI "#" ///< http://lv2plug.in/ns/ext/worker#
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35
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36 #define LV2_WORKER__interface LV2_WORKER_PREFIX "interface" ///< http://lv2plug.in/ns/ext/worker#interface
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37 #define LV2_WORKER__schedule LV2_WORKER_PREFIX "schedule" ///< http://lv2plug.in/ns/ext/worker#schedule
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38
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39 #ifdef __cplusplus
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40 extern "C" {
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41 #endif
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42
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43 /**
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44 Status code for worker functions.
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45 */
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46 typedef enum {
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47 LV2_WORKER_SUCCESS = 0, /**< Completed successfully. */
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48 LV2_WORKER_ERR_UNKNOWN = 1, /**< Unknown error. */
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49 LV2_WORKER_ERR_NO_SPACE = 2 /**< Failed due to lack of space. */
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50 } LV2_Worker_Status;
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51
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52 /** Opaque handle for LV2_Worker_Interface::work(). */
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53 typedef void* LV2_Worker_Respond_Handle;
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54
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55 /**
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56 A function to respond to run() from the worker method.
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57
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58 The `data` MUST be safe for the host to copy and later pass to
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59 work_response(), and the host MUST guarantee that it will be eventually
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60 passed to work_response() if this function returns LV2_WORKER_SUCCESS.
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61 */
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62 typedef LV2_Worker_Status (*LV2_Worker_Respond_Function)(
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63 LV2_Worker_Respond_Handle handle,
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64 uint32_t size,
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65 const void* data);
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66
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67 /**
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68 Plugin Worker Interface.
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69
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70 This is the interface provided by the plugin to implement a worker method.
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71 The plugin's extension_data() method should return an LV2_Worker_Interface
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72 when called with LV2_WORKER__interface as its argument.
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73 */
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74 typedef struct _LV2_Worker_Interface {
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75 /**
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76 The worker method. This is called by the host in a non-realtime context
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77 as requested, possibly with an arbitrary message to handle.
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78
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79 A response can be sent to run() using `respond`. The plugin MUST NOT
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80 make any assumptions about which thread calls this method, except that
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81 there are no real-time requirements and only one call may be executed at
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82 a time. That is, the host MAY call this method from any non-real-time
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83 thread, but MUST NOT make concurrent calls to this method from several
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84 threads.
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85
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86 @param instance The LV2 instance this is a method on.
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87 @param respond A function for sending a response to run().
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88 @param handle Must be passed to `respond` if it is called.
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89 @param size The size of `data`.
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90 @param data Data from run(), or NULL.
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91 */
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92 LV2_Worker_Status (*work)(LV2_Handle instance,
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93 LV2_Worker_Respond_Function respond,
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94 LV2_Worker_Respond_Handle handle,
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95 uint32_t size,
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96 const void* data);
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97
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98 /**
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99 Handle a response from the worker. This is called by the host in the
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100 run() context when a response from the worker is ready.
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101
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102 @param instance The LV2 instance this is a method on.
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103 @param size The size of `body`.
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104 @param body Message body, or NULL.
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105 */
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106 LV2_Worker_Status (*work_response)(LV2_Handle instance,
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107 uint32_t size,
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108 const void* body);
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109
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110 /**
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111 Called when all responses for this cycle have been delivered.
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112
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113 Since work_response() may be called after run() finished, this provides
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114 a hook for code that must run after the cycle is completed.
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115
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116 This field may be NULL if the plugin has no use for it. Otherwise, the
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117 host MUST call it after every run(), regardless of whether or not any
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118 responses were sent that cycle.
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119 */
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120 LV2_Worker_Status (*end_run)(LV2_Handle instance);
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121 } LV2_Worker_Interface;
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122
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123 /** Opaque handle for LV2_Worker_Schedule. */
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124 typedef void* LV2_Worker_Schedule_Handle;
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125
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126 /**
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127 Schedule Worker Host Feature.
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128
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129 The host passes this feature to provide a schedule_work() function, which
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130 the plugin can use to schedule a worker call from run().
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131 */
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132 typedef struct _LV2_Worker_Schedule {
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133 /**
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134 Opaque host data.
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135 */
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136 LV2_Worker_Schedule_Handle handle;
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137
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138 /**
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139 Request from run() that the host call the worker.
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140
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141 This function is in the audio threading class. It should be called from
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142 run() to request that the host call the work() method in a non-realtime
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143 context with the given arguments.
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144
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145 This function is always safe to call from run(), but it is not
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146 guaranteed that the worker is actually called from a different thread.
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147 In particular, when free-wheeling (e.g. for offline rendering), the
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148 worker may be executed immediately. This allows single-threaded
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149 processing with sample accuracy and avoids timing problems when run() is
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150 executing much faster or slower than real-time.
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151
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152 Plugins SHOULD be written in such a way that if the worker runs
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153 immediately, and responses from the worker are delivered immediately,
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154 the effect of the work takes place immediately with sample accuracy.
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155
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156 The `data` MUST be safe for the host to copy and later pass to work(),
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157 and the host MUST guarantee that it will be eventually passed to work()
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158 if this function returns LV2_WORKER_SUCCESS.
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159
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160 @param handle The handle field of this struct.
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161 @param size The size of `data`.
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162 @param data Message to pass to work(), or NULL.
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163 */
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164 LV2_Worker_Status (*schedule_work)(LV2_Worker_Schedule_Handle handle,
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165 uint32_t size,
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166 const void* data);
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167 } LV2_Worker_Schedule;
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168
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169 #ifdef __cplusplus
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170 } /* extern "C" */
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171 #endif
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172
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173 #endif /* LV2_WORKER_H */
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174
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175 /**
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176 @}
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177 */