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annotate DPF-Prymula-audioplugins/dpf/distrho/src/clap/events.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 #pragma once |
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2 |
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3 #include "private/std.h" |
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4 #include "fixedpoint.h" |
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5 #include "id.h" |
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6 |
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7 #ifdef __cplusplus |
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8 extern "C" { |
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9 #endif |
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10 |
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11 // event header |
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12 // must be the first attribute of the event |
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13 typedef struct clap_event_header { |
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14 uint32_t size; // event size including this header, eg: sizeof (clap_event_note) |
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15 uint32_t time; // sample offset within the buffer for this event |
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16 uint16_t space_id; // event space, see clap_host_event_registry |
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17 uint16_t type; // event type |
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18 uint32_t flags; // see clap_event_flags |
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19 } clap_event_header_t; |
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20 |
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21 // The clap core event space |
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22 static const CLAP_CONSTEXPR uint16_t CLAP_CORE_EVENT_SPACE_ID = 0; |
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23 |
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24 enum clap_event_flags { |
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25 // Indicate a live user event, for example a user turning a physical knob |
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26 // or playing a physical key. |
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27 CLAP_EVENT_IS_LIVE = 1 << 0, |
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28 |
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29 // Indicate that the event should not be recorded. |
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30 // For example this is useful when a parameter changes because of a MIDI CC, |
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31 // because if the host records both the MIDI CC automation and the parameter |
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32 // automation there will be a conflict. |
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33 CLAP_EVENT_DONT_RECORD = 1 << 1, |
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34 }; |
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35 |
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36 // Some of the following events overlap, a note on can be expressed with: |
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37 // - CLAP_EVENT_NOTE_ON |
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38 // - CLAP_EVENT_MIDI |
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39 // - CLAP_EVENT_MIDI2 |
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40 // |
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41 // The preferred way of sending a note event is to use CLAP_EVENT_NOTE_*. |
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42 // |
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43 // The same event must not be sent twice: it is forbidden to send a the same note on |
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44 // encoded with both CLAP_EVENT_NOTE_ON and CLAP_EVENT_MIDI. |
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45 // |
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46 // The plugins are encouraged to be able to handle note events encoded as raw midi or midi2, |
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47 // or implement clap_plugin_event_filter and reject raw midi and midi2 events. |
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48 enum { |
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49 // NOTE_ON and NOTE_OFF represent a key pressed and key released event, respectively. |
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50 // A NOTE_ON with a velocity of 0 is valid and should not be interpreted as a NOTE_OFF. |
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51 // |
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52 // NOTE_CHOKE is meant to choke the voice(s), like in a drum machine when a closed hihat |
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53 // chokes an open hihat. This event can be sent by the host to the plugin. Here are two use cases: |
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54 // - a plugin is inside a drum pad in Bitwig Studio's drum machine, and this pad is choked by |
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55 // another one |
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56 // - the user double clicks the DAW's stop button in the transport which then stops the sound on |
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57 // every tracks |
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58 // |
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59 // NOTE_END is sent by the plugin to the host. The port, channel, key and note_id are those given |
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60 // by the host in the NOTE_ON event. In other words, this event is matched against the |
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61 // plugin's note input port. |
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62 // NOTE_END is useful to help the host to match the plugin's voice life time. |
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63 // |
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64 // When using polyphonic modulations, the host has to allocate and release voices for its |
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65 // polyphonic modulator. Yet only the plugin effectively knows when the host should terminate |
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66 // a voice. NOTE_END solves that issue in a non-intrusive and cooperative way. |
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67 // |
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68 // CLAP assumes that the host will allocate a unique voice on NOTE_ON event for a given port, |
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69 // channel and key. This voice will run until the plugin will instruct the host to terminate |
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70 // it by sending a NOTE_END event. |
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71 // |
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72 // Consider the following sequence: |
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73 // - process() |
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74 // Host->Plugin NoteOn(port:0, channel:0, key:16, time:t0) |
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75 // Host->Plugin NoteOn(port:0, channel:0, key:64, time:t0) |
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76 // Host->Plugin NoteOff(port:0, channel:0, key:16, t1) |
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77 // Host->Plugin NoteOff(port:0, channel:0, key:64, t1) |
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78 // # on t2, both notes did terminate |
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79 // Host->Plugin NoteOn(port:0, channel:0, key:64, t3) |
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80 // # Here the plugin finished processing all the frames and will tell the host |
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81 // # to terminate the voice on key 16 but not 64, because a note has been started at t3 |
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82 // Plugin->Host NoteEnd(port:0, channel:0, key:16, time:ignored) |
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83 // |
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84 // These four events use clap_event_note. |
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85 CLAP_EVENT_NOTE_ON, |
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86 CLAP_EVENT_NOTE_OFF, |
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87 CLAP_EVENT_NOTE_CHOKE, |
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88 CLAP_EVENT_NOTE_END, |
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89 |
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90 // Represents a note expression. |
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91 // Uses clap_event_note_expression. |
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92 CLAP_EVENT_NOTE_EXPRESSION, |
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93 |
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94 // PARAM_VALUE sets the parameter's value; uses clap_event_param_value. |
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95 // PARAM_MOD sets the parameter's modulation amount; uses clap_event_param_mod. |
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96 // |
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97 // The value heard is: param_value + param_mod. |
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98 // |
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99 // In case of a concurrent global value/modulation versus a polyphonic one, |
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100 // the voice should only use the polyphonic one and the polyphonic modulation |
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101 // amount will already include the monophonic signal. |
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102 CLAP_EVENT_PARAM_VALUE, |
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103 CLAP_EVENT_PARAM_MOD, |
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104 |
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105 // Indicates that the user started or finished adjusting a knob. |
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106 // This is not mandatory to wrap parameter changes with gesture events, but this improves |
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107 // the user experience a lot when recording automation or overriding automation playback. |
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108 // Uses clap_event_param_gesture. |
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109 CLAP_EVENT_PARAM_GESTURE_BEGIN, |
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110 CLAP_EVENT_PARAM_GESTURE_END, |
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111 |
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112 CLAP_EVENT_TRANSPORT, // update the transport info; clap_event_transport |
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113 CLAP_EVENT_MIDI, // raw midi event; clap_event_midi |
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114 CLAP_EVENT_MIDI_SYSEX, // raw midi sysex event; clap_event_midi_sysex |
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115 CLAP_EVENT_MIDI2, // raw midi 2 event; clap_event_midi2 |
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116 }; |
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117 |
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118 // Note on, off, end and choke events. |
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119 // In the case of note choke or end events: |
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120 // - the velocity is ignored. |
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121 // - key and channel are used to match active notes, a value of -1 matches all. |
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122 typedef struct clap_event_note { |
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123 clap_event_header_t header; |
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124 |
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125 int32_t note_id; // -1 if unspecified, otherwise >=0 |
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126 int16_t port_index; |
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127 int16_t channel; // 0..15 |
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128 int16_t key; // 0..127 |
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129 double velocity; // 0..1 |
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130 } clap_event_note_t; |
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131 |
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132 enum { |
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133 // with 0 < x <= 4, plain = 20 * log(x) |
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134 CLAP_NOTE_EXPRESSION_VOLUME, |
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135 |
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136 // pan, 0 left, 0.5 center, 1 right |
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137 CLAP_NOTE_EXPRESSION_PAN, |
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138 |
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139 // relative tuning in semitone, from -120 to +120 |
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140 CLAP_NOTE_EXPRESSION_TUNING, |
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141 |
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142 // 0..1 |
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143 CLAP_NOTE_EXPRESSION_VIBRATO, |
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144 CLAP_NOTE_EXPRESSION_EXPRESSION, |
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145 CLAP_NOTE_EXPRESSION_BRIGHTNESS, |
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146 CLAP_NOTE_EXPRESSION_PRESSURE, |
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147 }; |
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148 typedef int32_t clap_note_expression; |
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149 |
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150 typedef struct clap_event_note_expression { |
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151 clap_event_header_t header; |
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152 |
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153 clap_note_expression expression_id; |
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154 |
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155 // target a specific note_id, port, key and channel, -1 for global |
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156 int32_t note_id; |
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157 int16_t port_index; |
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158 int16_t channel; |
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159 int16_t key; |
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160 |
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161 double value; // see expression for the range |
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162 } clap_event_note_expression_t; |
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163 |
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164 typedef struct clap_event_param_value { |
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165 clap_event_header_t header; |
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166 |
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167 // target parameter |
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168 clap_id param_id; // @ref clap_param_info.id |
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169 void *cookie; // @ref clap_param_info.cookie |
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170 |
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171 // target a specific note_id, port, key and channel, -1 for global |
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172 int32_t note_id; |
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173 int16_t port_index; |
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174 int16_t channel; |
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175 int16_t key; |
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176 |
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177 double value; |
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178 } clap_event_param_value_t; |
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179 |
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180 typedef struct clap_event_param_mod { |
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181 clap_event_header_t header; |
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182 |
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183 // target parameter |
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184 clap_id param_id; // @ref clap_param_info.id |
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185 void *cookie; // @ref clap_param_info.cookie |
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186 |
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187 // target a specific note_id, port, key and channel, -1 for global |
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188 int32_t note_id; |
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189 int16_t port_index; |
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190 int16_t channel; |
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191 int16_t key; |
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192 |
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193 double amount; // modulation amount |
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194 } clap_event_param_mod_t; |
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195 |
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196 typedef struct clap_event_param_gesture { |
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197 clap_event_header_t header; |
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198 |
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199 // target parameter |
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200 clap_id param_id; // @ref clap_param_info.id |
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201 } clap_event_param_gesture_t; |
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202 |
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203 enum clap_transport_flags { |
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204 CLAP_TRANSPORT_HAS_TEMPO = 1 << 0, |
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205 CLAP_TRANSPORT_HAS_BEATS_TIMELINE = 1 << 1, |
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206 CLAP_TRANSPORT_HAS_SECONDS_TIMELINE = 1 << 2, |
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207 CLAP_TRANSPORT_HAS_TIME_SIGNATURE = 1 << 3, |
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208 CLAP_TRANSPORT_IS_PLAYING = 1 << 4, |
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209 CLAP_TRANSPORT_IS_RECORDING = 1 << 5, |
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210 CLAP_TRANSPORT_IS_LOOP_ACTIVE = 1 << 6, |
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211 CLAP_TRANSPORT_IS_WITHIN_PRE_ROLL = 1 << 7, |
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212 }; |
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213 |
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214 typedef struct clap_event_transport { |
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215 clap_event_header_t header; |
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216 |
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217 uint32_t flags; // see clap_transport_flags |
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218 |
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219 clap_beattime song_pos_beats; // position in beats |
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220 clap_sectime song_pos_seconds; // position in seconds |
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221 |
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222 double tempo; // in bpm |
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223 double tempo_inc; // tempo increment for each samples and until the next |
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224 // time info event |
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225 |
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226 clap_beattime loop_start_beats; |
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227 clap_beattime loop_end_beats; |
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228 clap_sectime loop_start_seconds; |
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229 clap_sectime loop_end_seconds; |
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230 |
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231 clap_beattime bar_start; // start pos of the current bar |
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232 int32_t bar_number; // bar at song pos 0 has the number 0 |
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233 |
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234 uint16_t tsig_num; // time signature numerator |
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235 uint16_t tsig_denom; // time signature denominator |
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236 } clap_event_transport_t; |
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237 |
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238 typedef struct clap_event_midi { |
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239 clap_event_header_t header; |
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240 |
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241 uint16_t port_index; |
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242 uint8_t data[3]; |
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243 } clap_event_midi_t; |
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244 |
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245 typedef struct clap_event_midi_sysex { |
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246 clap_event_header_t header; |
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247 |
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248 uint16_t port_index; |
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249 const uint8_t *buffer; // midi buffer |
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250 uint32_t size; |
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251 } clap_event_midi_sysex_t; |
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252 |
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253 // While it is possible to use a series of midi2 event to send a sysex, |
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254 // prefer clap_event_midi_sysex if possible for efficiency. |
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255 typedef struct clap_event_midi2 { |
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256 clap_event_header_t header; |
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257 |
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258 uint16_t port_index; |
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259 uint32_t data[4]; |
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260 } clap_event_midi2_t; |
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261 |
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262 // Input event list, events must be sorted by time. |
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263 typedef struct clap_input_events { |
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264 void *ctx; // reserved pointer for the list |
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265 |
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266 // returns the number of events in the list |
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267 uint32_t(CLAP_ABI *size)(const struct clap_input_events *list); |
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268 |
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269 // Don't free the returned event, it belongs to the list |
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270 const clap_event_header_t *(CLAP_ABI *get)(const struct clap_input_events *list, uint32_t index); |
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271 } clap_input_events_t; |
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272 |
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273 // Output event list, events must be sorted by time. |
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274 typedef struct clap_output_events { |
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275 void *ctx; // reserved pointer for the list |
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276 |
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277 // Pushes a copy of the event |
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278 // returns false if the event could not be pushed to the queue (out of memory?) |
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279 bool(CLAP_ABI *try_push)(const struct clap_output_events *list, |
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280 const clap_event_header_t *event); |
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281 } clap_output_events_t; |
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282 |
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283 #ifdef __cplusplus |
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284 } |
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285 #endif |