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

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author prymula <prymula76@outlook.com>
date Tue, 30 Jan 2024 16:43:10 +0100
parents 84e66ea83026
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1 /*
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2 LV2 UI Extension
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3 Copyright 2009-2016 David Robillard <d@drobilla.net>
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4 Copyright 2006-2011 Lars Luthman <lars.luthman@gmail.com>
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5
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6 Permission to use, copy, modify, and/or distribute this software for any
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7 purpose with or without fee is hereby granted, provided that the above
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8 copyright notice and this permission notice appear in all copies.
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9
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10 THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 /**
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20 @defgroup ui User Interfaces
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21
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22 User interfaces of any type for plugins,
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23 <http://lv2plug.in/ns/extensions/ui> for details.
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24
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25 @{
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26 */
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27
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28 #ifndef LV2_UI_H
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29 #define LV2_UI_H
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30
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31 #include <stdint.h>
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32
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33 #include "lv2.h"
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34 #include "urid.h"
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35
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36 #define LV2_UI_URI "http://lv2plug.in/ns/extensions/ui" ///< http://lv2plug.in/ns/extensions/ui
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37 #define LV2_UI_PREFIX LV2_UI_URI "#" ///< http://lv2plug.in/ns/extensions/ui#
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38
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39 #define LV2_UI__CocoaUI LV2_UI_PREFIX "CocoaUI" ///< http://lv2plug.in/ns/extensions/ui#CocoaUI
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40 #define LV2_UI__Gtk3UI LV2_UI_PREFIX "Gtk3UI" ///< http://lv2plug.in/ns/extensions/ui#Gtk3UI
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41 #define LV2_UI__GtkUI LV2_UI_PREFIX "GtkUI" ///< http://lv2plug.in/ns/extensions/ui#GtkUI
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42 #define LV2_UI__PortNotification LV2_UI_PREFIX "PortNotification" ///< http://lv2plug.in/ns/extensions/ui#PortNotification
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43 #define LV2_UI__PortProtocol LV2_UI_PREFIX "PortProtocol" ///< http://lv2plug.in/ns/extensions/ui#PortProtocol
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44 #define LV2_UI__Qt4UI LV2_UI_PREFIX "Qt4UI" ///< http://lv2plug.in/ns/extensions/ui#Qt4UI
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45 #define LV2_UI__Qt5UI LV2_UI_PREFIX "Qt5UI" ///< http://lv2plug.in/ns/extensions/ui#Qt5UI
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46 #define LV2_UI__UI LV2_UI_PREFIX "UI" ///< http://lv2plug.in/ns/extensions/ui#UI
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47 #define LV2_UI__WindowsUI LV2_UI_PREFIX "WindowsUI" ///< http://lv2plug.in/ns/extensions/ui#WindowsUI
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48 #define LV2_UI__X11UI LV2_UI_PREFIX "X11UI" ///< http://lv2plug.in/ns/extensions/ui#X11UI
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49 #define LV2_UI__backgroundColor LV2_UI_PREFIX "backgroundColor" ///< http://lv2plug.in/ns/extensions/ui#backgroundColor
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50 #define LV2_UI__binary LV2_UI_PREFIX "binary" ///< http://lv2plug.in/ns/extensions/ui#binary
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51 #define LV2_UI__fixedSize LV2_UI_PREFIX "fixedSize" ///< http://lv2plug.in/ns/extensions/ui#fixedSize
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52 #define LV2_UI__foregroundColor LV2_UI_PREFIX "foregroundColor" ///< http://lv2plug.in/ns/extensions/ui#foregroundColor
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53 #define LV2_UI__idleInterface LV2_UI_PREFIX "idleInterface" ///< http://lv2plug.in/ns/extensions/ui#idleInterface
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54 #define LV2_UI__noUserResize LV2_UI_PREFIX "noUserResize" ///< http://lv2plug.in/ns/extensions/ui#noUserResize
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55 #define LV2_UI__notifyType LV2_UI_PREFIX "notifyType" ///< http://lv2plug.in/ns/extensions/ui#notifyType
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56 #define LV2_UI__parent LV2_UI_PREFIX "parent" ///< http://lv2plug.in/ns/extensions/ui#parent
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57 #define LV2_UI__plugin LV2_UI_PREFIX "plugin" ///< http://lv2plug.in/ns/extensions/ui#plugin
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58 #define LV2_UI__portIndex LV2_UI_PREFIX "portIndex" ///< http://lv2plug.in/ns/extensions/ui#portIndex
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59 #define LV2_UI__portMap LV2_UI_PREFIX "portMap" ///< http://lv2plug.in/ns/extensions/ui#portMap
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60 #define LV2_UI__portNotification LV2_UI_PREFIX "portNotification" ///< http://lv2plug.in/ns/extensions/ui#portNotification
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61 #define LV2_UI__portSubscribe LV2_UI_PREFIX "portSubscribe" ///< http://lv2plug.in/ns/extensions/ui#portSubscribe
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62 #define LV2_UI__protocol LV2_UI_PREFIX "protocol" ///< http://lv2plug.in/ns/extensions/ui#protocol
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63 #define LV2_UI__floatProtocol LV2_UI_PREFIX "floatProtocol" ///< http://lv2plug.in/ns/extensions/ui#floatProtocol
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64 #define LV2_UI__peakProtocol LV2_UI_PREFIX "peakProtocol" ///< http://lv2plug.in/ns/extensions/ui#peakProtocol
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65 #define LV2_UI__requestValue LV2_UI_PREFIX "requestValue" ///< http://lv2plug.in/ns/extensions/ui#requestValue
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66 #define LV2_UI__resize LV2_UI_PREFIX "resize" ///< http://lv2plug.in/ns/extensions/ui#resize
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67 #define LV2_UI__scaleFactor LV2_UI_PREFIX "scaleFactor" ///< http://lv2plug.in/ns/extensions/ui#scaleFactor
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68 #define LV2_UI__showInterface LV2_UI_PREFIX "showInterface" ///< http://lv2plug.in/ns/extensions/ui#showInterface
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69 #define LV2_UI__touch LV2_UI_PREFIX "touch" ///< http://lv2plug.in/ns/extensions/ui#touch
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70 #define LV2_UI__ui LV2_UI_PREFIX "ui" ///< http://lv2plug.in/ns/extensions/ui#ui
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71 #define LV2_UI__updateRate LV2_UI_PREFIX "updateRate" ///< http://lv2plug.in/ns/extensions/ui#updateRate
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72 #define LV2_UI__windowTitle LV2_UI_PREFIX "windowTitle" ///< http://lv2plug.in/ns/extensions/ui#windowTitle
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73
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74 /**
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75 The index returned by LV2UI_Port_Map::port_index() for unknown ports.
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76 */
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77 #define LV2UI_INVALID_PORT_INDEX ((uint32_t)-1)
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78
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79 #ifdef __cplusplus
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80 extern "C" {
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81 #else
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82 # include <stdbool.h>
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83 #endif
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84
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85 /**
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86 A pointer to some widget or other type of UI handle.
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87
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88 The actual type is defined by the type of the UI.
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89 */
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90 typedef void* LV2UI_Widget;
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91
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92 /**
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93 A pointer to UI instance internals.
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94
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95 The host may compare this to NULL, but otherwise MUST NOT interpret it.
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96 */
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97 typedef void* LV2UI_Handle;
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98
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99 /**
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100 A pointer to a controller provided by the host.
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101
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102 The UI may compare this to NULL, but otherwise MUST NOT interpret it.
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103 */
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104 typedef void* LV2UI_Controller;
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105
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106 /**
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107 A pointer to opaque data for a feature.
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108 */
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109 typedef void* LV2UI_Feature_Handle;
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110
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111 /**
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112 A host-provided function that sends data to a plugin's input ports.
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113
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114 @param controller The opaque controller pointer passed to
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115 LV2UI_Descriptor::instantiate().
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116
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117 @param port_index Index of the port to update.
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118
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119 @param buffer Buffer containing `buffer_size` bytes of data.
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120
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121 @param buffer_size Size of `buffer` in bytes.
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122
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123 @param port_protocol Either 0 or the URID for a ui:PortProtocol. If 0, the
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124 protocol is implicitly ui:floatProtocol, the port MUST be an lv2:ControlPort
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125 input, `buffer` MUST point to a single float value, and `buffer_size` MUST
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126 be sizeof(float). The UI SHOULD NOT use a protocol not supported by the
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127 host, but the host MUST gracefully ignore any protocol it does not
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128 understand.
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129 */
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130 typedef void (*LV2UI_Write_Function)(LV2UI_Controller controller,
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131 uint32_t port_index,
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132 uint32_t buffer_size,
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133 uint32_t port_protocol,
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134 const void* buffer);
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135
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136 /**
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137 A plugin UI.
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138
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139 A pointer to an object of this type is returned by the lv2ui_descriptor()
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140 function.
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141 */
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142 typedef struct _LV2UI_Descriptor {
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143 /**
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144 The URI for this UI (not for the plugin it controls).
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145 */
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146 const char* URI;
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147
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148 /**
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149 Create a new UI and return a handle to it. This function works
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150 similarly to LV2_Descriptor::instantiate().
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151
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152 @param descriptor The descriptor for the UI to instantiate.
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153
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154 @param plugin_uri The URI of the plugin that this UI will control.
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155
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156 @param bundle_path The path to the bundle containing this UI, including
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157 the trailing directory separator.
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158
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159 @param write_function A function that the UI can use to send data to the
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160 plugin's input ports.
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161
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162 @param controller A handle for the UI instance to be passed as the
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163 first parameter of UI methods.
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164
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165 @param widget (output) widget pointer. The UI points this at its main
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166 widget, which has the type defined by the UI type in the data file.
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167
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168 @param features An array of LV2_Feature pointers. The host must pass
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169 all feature URIs that it and the UI supports and any additional data, as
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170 in LV2_Descriptor::instantiate(). Note that UI features and plugin
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171 features are not necessarily the same.
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172
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173 */
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174 LV2UI_Handle (*instantiate)(const struct _LV2UI_Descriptor* descriptor,
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175 const char* plugin_uri,
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176 const char* bundle_path,
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177 LV2UI_Write_Function write_function,
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178 LV2UI_Controller controller,
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179 LV2UI_Widget* widget,
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180 const LV2_Feature* const* features);
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181
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182
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183 /**
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184 Destroy the UI. The host must not try to access the widget after
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185 calling this function.
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186 */
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187 void (*cleanup)(LV2UI_Handle ui);
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188
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189 /**
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190 Tell the UI that something interesting has happened at a plugin port.
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191
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192 What is "interesting" and how it is written to `buffer` is defined by
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193 `format`, which has the same meaning as in LV2UI_Write_Function().
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194 Format 0 is a special case for lv2:ControlPort, where this function
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195 should be called when the port value changes (but not necessarily for
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196 every change), `buffer_size` must be sizeof(float), and `buffer`
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197 points to a single IEEE-754 float.
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198
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199 By default, the host should only call this function for lv2:ControlPort
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200 inputs. However, the UI can request updates for other ports statically
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201 with ui:portNotification or dynamicaly with ui:portSubscribe.
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202
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203 The UI MUST NOT retain any reference to `buffer` after this function
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204 returns, it is only valid for the duration of the call.
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205
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206 This member may be NULL if the UI is not interested in any port events.
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207 */
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208 void (*port_event)(LV2UI_Handle ui,
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209 uint32_t port_index,
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210 uint32_t buffer_size,
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211 uint32_t format,
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212 const void* buffer);
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213
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214 /**
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215 Return a data structure associated with an extension URI, typically an
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216 interface struct with additional function pointers
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217
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218 This member may be set to NULL if the UI is not interested in supporting
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219 any extensions. This is similar to LV2_Descriptor::extension_data().
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220
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221 */
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222 const void* (*extension_data)(const char* uri);
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223 } LV2UI_Descriptor;
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224
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225 /**
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226 Feature/interface for resizable UIs (LV2_UI__resize).
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227
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228 This structure is used in two ways: as a feature passed by the host via
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229 LV2UI_Descriptor::instantiate(), or as an interface provided by a UI via
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230 LV2UI_Descriptor::extension_data()).
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231 */
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232 typedef struct _LV2UI_Resize {
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233 /**
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234 Pointer to opaque data which must be passed to ui_resize().
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235 */
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236 LV2UI_Feature_Handle handle;
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237
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238 /**
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239 Request/advertise a size change.
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240
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241 When provided by the host, the UI may call this function to inform the
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242 host about the size of the UI.
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243
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244 When provided by the UI, the host may call this function to notify the
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245 UI that it should change its size accordingly. In this case, the host
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246 must pass the LV2UI_Handle to provide access to the UI instance.
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247
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248 @return 0 on success.
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249 */
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250 int (*ui_resize)(LV2UI_Feature_Handle handle, int width, int height);
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251 } LV2UI_Resize;
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252
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253 /**
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254 Feature to map port symbols to UIs.
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255
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256 This can be used by the UI to get the index for a port with the given
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257 symbol. This makes it possible to implement and distribute a UI separately
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258 from the plugin (since symbol, unlike index, is a stable port identifier).
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259 */
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260 typedef struct _LV2UI_Port_Map {
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261 /**
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262 Pointer to opaque data which must be passed to port_index().
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263 */
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264 LV2UI_Feature_Handle handle;
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265
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266 /**
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267 Get the index for the port with the given `symbol`.
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268
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269 @return The index of the port, or LV2UI_INVALID_PORT_INDEX if no such
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270 port is found.
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271 */
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272 uint32_t (*port_index)(LV2UI_Feature_Handle handle, const char* symbol);
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273 } LV2UI_Port_Map;
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274
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275 /**
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276 Feature to subscribe to port updates (LV2_UI__portSubscribe).
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277 */
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278 typedef struct _LV2UI_Port_Subscribe {
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279 /**
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280 Pointer to opaque data which must be passed to subscribe() and
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281 unsubscribe().
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282 */
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283 LV2UI_Feature_Handle handle;
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284
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285 /**
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286 Subscribe to updates for a port.
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287
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288 This means that the host will call the UI's port_event() function when
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289 the port value changes (as defined by protocol).
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290
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291 Calling this function with the same `port_index` and `port_protocol`
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292 as an already active subscription has no effect.
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293
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294 @param handle The handle field of this struct.
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295 @param port_index The index of the port.
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296 @param port_protocol The URID of the ui:PortProtocol.
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297 @param features Features for this subscription.
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298 @return 0 on success.
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299 */
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300 uint32_t (*subscribe)(LV2UI_Feature_Handle handle,
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301 uint32_t port_index,
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302 uint32_t port_protocol,
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303 const LV2_Feature* const* features);
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304
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305 /**
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306 Unsubscribe from updates for a port.
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307
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308 This means that the host will cease calling calling port_event() when
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309 the port value changes.
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310
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311 Calling this function with a `port_index` and `port_protocol` that
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312 does not refer to an active port subscription has no effect.
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313
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314 @param handle The handle field of this struct.
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315 @param port_index The index of the port.
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316 @param port_protocol The URID of the ui:PortProtocol.
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317 @param features Features for this subscription.
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318 @return 0 on success.
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319 */
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320 uint32_t (*unsubscribe)(LV2UI_Feature_Handle handle,
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321 uint32_t port_index,
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322 uint32_t port_protocol,
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323 const LV2_Feature* const* features);
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324 } LV2UI_Port_Subscribe;
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325
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326 /**
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327 A feature to notify the host that the user has grabbed a UI control.
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328 */
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329 typedef struct _LV2UI_Touch {
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330 /**
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331 Pointer to opaque data which must be passed to ui_resize().
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332 */
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333 LV2UI_Feature_Handle handle;
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334
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335 /**
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336 Notify the host that a control has been grabbed or released.
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337
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338 The host should cease automating the port or otherwise manipulating the
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339 port value until the control has been ungrabbed.
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340
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341 @param handle The handle field of this struct.
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342 @param port_index The index of the port associated with the control.
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343 @param grabbed If true, the control has been grabbed, otherwise the
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344 control has been released.
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345 */
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346 void (*touch)(LV2UI_Feature_Handle handle,
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347 uint32_t port_index,
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348 bool grabbed);
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349 } LV2UI_Touch;
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350
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351 /**
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352 A status code for LV2UI_Request_Value::request.
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353 */
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354 typedef enum {
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355 /**
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diff changeset
356 Completed successfully.
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diff changeset
357
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parents:
diff changeset
358 The host will set the parameter later if the user choses a new value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
359 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
360 LV2UI_REQUEST_VALUE_SUCCESS,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
361
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
362 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
363 Parameter already being requested.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
364
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
365 The host is already requesting a parameter from the user (for example, a
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
366 dialog is visible), or the UI is otherwise busy and can not make this
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
367 request.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
368 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
369 LV2UI_REQUEST_VALUE_BUSY,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
370
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
371 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
372 Unknown parameter.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
373
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
374 The host is not aware of this parameter, and is not able to set a new
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
375 value for it.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
376 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
377 LV2UI_REQUEST_VALUE_ERR_UNKNOWN,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
378
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
379 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
380 Unsupported parameter.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
381
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
382 The host knows about this parameter, but does not support requesting a
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
383 new value for it from the user. This is likely because the host does
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
384 not have UI support for choosing a value with the appropriate type.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
385 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
386 LV2UI_REQUEST_VALUE_ERR_UNSUPPORTED
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
387 } LV2UI_Request_Value_Status;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
388
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
389 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
390 A feature to request a new parameter value from the host.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
391 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
392 typedef struct {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
393 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
394 Pointer to opaque data which must be passed to request().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
395 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
396 LV2UI_Feature_Handle handle;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
397
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
398 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
399 Request a value for a parameter from the host.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
400
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
401 This is mainly used by UIs to request values for complex parameters that
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
402 don't change often, such as file paths, but it may be used to request
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
403 any parameter value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
404
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
405 This function returns immediately, and the return value indicates
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
406 whether the host can fulfill the request. The host may notify the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
407 plugin about the new parameter value, for example when a file is
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
408 selected by the user, via the usual mechanism. Typically, the host will
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
409 send a message to the plugin that sets the new parameter value, and the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
410 plugin will notify the UI via a message as usual for any other parameter
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
411 change.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
412
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
413 To provide an appropriate UI, the host can determine details about the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
414 parameter from the plugin data as usual. The additional parameters of
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
415 this function provide support for more advanced use cases, but in the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
416 simple common case, the plugin will simply pass the key of the desired
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
417 parameter and zero for everything else.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
418
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
419 @param handle The handle field of this struct.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
420
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
421 @param key The URID of the parameter.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
422
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
423 @param type The optional type of the value to request. This can be used
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
424 to request a specific value type for parameters that support several.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
425 If non-zero, it must be the URID of an instance of rdfs:Class or
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
426 rdfs:Datatype.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
427
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
428 @param features Additional features for this request, or NULL.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
429
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
430 @return A status code which is 0 on success.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
431 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
432 LV2UI_Request_Value_Status (*request)(LV2UI_Feature_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
433 LV2_URID key,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
434 LV2_URID type,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
435 const LV2_Feature* const* features);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
436
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
437 } LV2UI_Request_Value;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
438
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
439 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
440 UI Idle Interface (LV2_UI__idleInterface)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
441
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
442 UIs can provide this interface to have an idle() callback called by the host
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
443 rapidly to update the UI.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
444 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
445 typedef struct _LV2UI_Idle_Interface {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
446 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
447 Run a single iteration of the UI's idle loop.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
448
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
449 This will be called rapidly in the UI thread at a rate appropriate
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
450 for a toolkit main loop. There are no precise timing guarantees, but
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
451 the host should attempt to call idle() at a high enough rate for smooth
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
452 animation, at least 30Hz.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
453
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
454 @return non-zero if the UI has been closed, in which case the host
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
455 should stop calling idle(), and can either completely destroy the UI, or
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
456 re-show it and resume calling idle().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
457 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
458 int (*idle)(LV2UI_Handle ui);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
459 } LV2UI_Idle_Interface;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
460
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
461 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
462 UI Show Interface (LV2_UI__showInterface)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
463
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
464 UIs can provide this interface to show and hide a window, which allows them
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
465 to function in hosts unable to embed their widget. This allows any UI to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
466 provide a fallback for embedding that works in any host.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
467
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
468 If used:
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
469 - The host MUST use LV2UI_Idle_Interface to drive the UI.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
470 - The UI MUST return non-zero from LV2UI_Idle_Interface::idle() when it has been closed.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
471 - If idle() returns non-zero, the host MUST call hide() and stop calling
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
472 idle(). It MAY later call show() then resume calling idle().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
473 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
474 typedef struct _LV2UI_Show_Interface {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
475 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
476 Show a window for this UI.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
477
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
478 The window title MAY have been passed by the host to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
479 LV2UI_Descriptor::instantiate() as an LV2_Options_Option with key
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
480 LV2_UI__windowTitle.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
481
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
482 @return 0 on success, or anything else to stop being called.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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483 */
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prymula <prymula76@outlook.com>
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484 int (*show)(LV2UI_Handle ui);
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485
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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486 /**
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prymula <prymula76@outlook.com>
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487 Hide the window for this UI.
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488
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
489 @return 0 on success, or anything else to stop being called.
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490 */
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491 int (*hide)(LV2UI_Handle ui);
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492 } LV2UI_Show_Interface;
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493
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prymula <prymula76@outlook.com>
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494 /**
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prymula <prymula76@outlook.com>
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495 Peak data for a slice of time, the update format for ui:peakProtocol.
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496 */
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prymula <prymula76@outlook.com>
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497 typedef struct _LV2UI_Peak_Data {
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498 /**
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diff changeset
499 The start of the measurement period. This is just a running counter
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
500 that is only meaningful in comparison to previous values and must not be
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
501 interpreted as an absolute time.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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502 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
503 uint32_t period_start;
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parents:
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504
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prymula <prymula76@outlook.com>
parents:
diff changeset
505 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
506 The size of the measurement period, in the same units as period_start.
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prymula <prymula76@outlook.com>
parents:
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507 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
508 uint32_t period_size;
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prymula <prymula76@outlook.com>
parents:
diff changeset
509
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prymula <prymula76@outlook.com>
parents:
diff changeset
510 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
511 The peak value for the measurement period. This should be the maximal
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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512 value for abs(sample) over all the samples in the period.
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parents:
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513 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
514 float peak;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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515 } LV2UI_Peak_Data;
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prymula <prymula76@outlook.com>
parents:
diff changeset
516
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
517 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
518 Prototype for UI accessor function.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
519
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
520 This is the entry point to a UI library, which works in the same way as
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
521 lv2_descriptor() but for UIs rather than plugins.
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prymula <prymula76@outlook.com>
parents:
diff changeset
522 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
523 LV2_SYMBOL_EXPORT
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
524 const LV2UI_Descriptor* lv2ui_descriptor(uint32_t index);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
525
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
526 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
527 The type of the lv2ui_descriptor() function.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
528 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
529 typedef const LV2UI_Descriptor* (*LV2UI_DescriptorFunction)(uint32_t index);
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prymula <prymula76@outlook.com>
parents:
diff changeset
530
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
531 #ifdef __cplusplus
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
532 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
533 #endif
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
534
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
535 #endif /* LV2_UI_H */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
536
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
537 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
538 @}
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
539 */