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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/lv2_programs.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 /*
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2 LV2 Programs Extension
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prymula <prymula76@outlook.com>
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3 Copyright 2012 Filipe Coelho <falktx@falktx.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 @file lv2_programs.h
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20 C header for the LV2 programs extension <http://kxstudio.sf.net/ns/lv2ext/programs>.
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21 */
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22
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23 #ifndef LV2_PROGRAMS_H
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24 #define LV2_PROGRAMS_H
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25
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26 #include "lv2.h"
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27 #include "ui.h"
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28
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29 #define LV2_PROGRAMS_URI "http://kxstudio.sf.net/ns/lv2ext/programs"
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30 #define LV2_PROGRAMS_PREFIX LV2_PROGRAMS_URI "#"
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31
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32 #define LV2_PROGRAMS__Host LV2_PROGRAMS_PREFIX "Host"
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33 #define LV2_PROGRAMS__Interface LV2_PROGRAMS_PREFIX "Interface"
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34 #define LV2_PROGRAMS__UIInterface LV2_PROGRAMS_PREFIX "UIInterface"
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35
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36 #ifdef __cplusplus
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37 extern "C" {
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38 #endif
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39
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40 typedef void* LV2_Programs_Handle;
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41
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42 typedef struct _LV2_Program_Descriptor {
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43
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44 /** Bank number for this program. Note that this extension does not
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45 support MIDI-style separation of bank LSB and MSB values. There is
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46 no restriction on the set of available banks: the numbers do not
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47 need to be contiguous, there does not need to be a bank 0, etc. */
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48 uint32_t bank;
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49
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50 /** Program number (unique within its bank) for this program. There is
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51 no restriction on the set of available programs: the numbers do not
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52 need to be contiguous, there does not need to be a program 0, etc. */
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53 uint32_t program;
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54
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55 /** Name of the program. */
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56 const char * name;
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57
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58 } LV2_Program_Descriptor;
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59
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60 /**
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61 Programs extension, plugin data.
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62
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63 When the plugin's extension_data is called with argument LV2_PROGRAMS__Interface,
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64 the plugin MUST return an LV2_Programs_Instance structure, which remains valid
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65 for the lifetime of the plugin.
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66 */
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67 typedef struct _LV2_Programs_Interface {
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68 /**
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69 * get_program()
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70 *
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71 * This member is a function pointer that provides a description
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72 * of a program (named preset sound) available on this plugin.
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73 *
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74 * The index argument is an index into the plugin's list of
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75 * programs, not a program number as represented by the Program
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76 * field of the LV2_Program_Descriptor. (This distinction is
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77 * needed to support plugins that use non-contiguous program or
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78 * bank numbers.)
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79 *
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80 * This function returns a LV2_Program_Descriptor pointer that is
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81 * guaranteed to be valid only until the next call to get_program
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82 * or deactivate, on the same plugin instance. This function must
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83 * return NULL if passed an index argument out of range, so that
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84 * the host can use it to query the number of programs as well as
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85 * their properties.
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86 */
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87 const LV2_Program_Descriptor *(*get_program)(LV2_Handle handle,
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88 uint32_t index);
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89
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90 /**
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91 * select_program()
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92 *
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93 * This member is a function pointer that selects a new program
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94 * for this plugin. The program change should take effect
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95 * immediately at the start of the next run() call. (This
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96 * means that a host providing the capability of changing programs
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97 * between any two notes on a track must vary the block size so as
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98 * to place the program change at the right place. A host that
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99 * wanted to avoid this would probably just instantiate a plugin
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100 * for each program.)
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101 *
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102 * Plugins should ignore a select_program() call with an invalid
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103 * bank or program.
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104 *
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105 * A plugin is not required to select any particular default
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106 * program on activate(): it's the host's duty to set a program
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107 * explicitly.
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108 *
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109 * A plugin is permitted to re-write the values of its input
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110 * control ports when select_program is called. The host should
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111 * re-read the input control port values and update its own
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112 * records appropriately. (This is the only circumstance in which
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113 * a LV2 plugin is allowed to modify its own control-input ports.)
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114 */
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115 void (*select_program)(LV2_Handle handle,
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116 uint32_t bank,
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117 uint32_t program);
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118
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119 } LV2_Programs_Interface;
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120
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121 /**
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122 Programs extension, UI data.
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123
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124 When the UI's extension_data is called with argument LV2_PROGRAMS__UIInterface,
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125 the UI MUST return an LV2_Programs_UI_Interface structure, which remains valid
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126 for the lifetime of the UI.
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127 */
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128 typedef struct _LV2_Programs_UI_Interface {
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129 /**
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130 * select_program()
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131 *
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132 * This is exactly the same as select_program in LV2_Programs_Instance,
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133 * but this struct relates to the UI instead of the plugin.
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134 *
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135 * When called, UIs should update their state to match the selected program.
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136 */
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137 void (*select_program)(LV2UI_Handle handle,
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138 uint32_t bank,
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139 uint32_t program);
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140
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141 } LV2_Programs_UI_Interface;
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142
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143 /**
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144 Feature data for LV2_PROGRAMS__Host.
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145 */
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146 typedef struct _LV2_Programs_Host {
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147 /**
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148 * Opaque host data.
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149 */
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150 LV2_Programs_Handle handle;
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151
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152 /**
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153 * program_changed()
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154 *
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155 * Tell the host to reload a plugin's program.
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156 * Parameter handle MUST be the 'handle' member of this struct.
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157 * Parameter index is program index to change.
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158 * When index is -1, host should reload all the programs.
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159 *
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160 * The plugin MUST NEVER call this function on a RT context or during run().
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161 *
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162 * NOTE: This call is to inform the host about a program's bank, program or name change.
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163 * It DOES NOT change the current selected program.
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164 */
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165 void (*program_changed)(LV2_Programs_Handle handle,
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166 int32_t index);
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167
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168 } LV2_Programs_Host;
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169
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170 #ifdef __cplusplus
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171 } /* extern "C" */
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172 #endif
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173
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174 #endif /* LV2_PROGRAMS_H */