File size: 6,498 Bytes
b0bfea8 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 |
/**
* synth_event_handler.js
* purpose: manages the synthesizer's event system, calling assinged functions when synthesizer requests dispatching the event
*/
/**
* @typedef {Object} NoteOnCallback
* @property {number} midiNote - The MIDI note number.
* @property {number} channel - The MIDI channel number.
* @property {number} velocity - The velocity of the note.
*/
/**
* @typedef {Object} NoteOffCallback
* @property {number} midiNote - The MIDI note number.
* @property {number} channel - The MIDI channel number.
*/
/**
* @typedef {Object} DrumChangeCallback
* @property {number} channel - The MIDI channel number.
* @property {boolean} isDrumChannel - Indicates if the channel is a drum channel.
*/
/**
* @typedef {Object} ProgramChangeCallback
* @property {number} channel - The MIDI channel number.
* @property {number} program - The program number.
* @property {number} bank - The bank number.
*/
/**
* @typedef {Object} ControllerChangeCallback
* @property {number} channel - The MIDI channel number.
* @property {number} controllerNumber - The controller number.
* @property {number} controllerValue - The value of the controller.
*/
/**
* @typedef {Object} MuteChannelCallback
* @property {number} channel - The MIDI channel number.
* @property {boolean} isMuted - Indicates if the channel is muted.
*/
/**
* @typedef {Object} PresetListChangeCallbackSingle
* @property {string} presetName - The name of the preset.
* @property {number} bank - The bank number.
* @property {number} program - The program number.
*/
/**
* @typedef {PresetListChangeCallbackSingle[]} PresetListChangeCallback - A list of preset objects.
*/
/**
* @typedef {Object} SynthDisplayCallback
* @property {Uint8Array} displayData - The data to display.
* @property {SynthDisplayType} displayType - The type of display.
*/
/**
* @typedef {Object} PitchWheelCallback
* @property {number} channel - The MIDI channel number.
* @property {number} MSB - The most significant byte of the pitch wheel value.
* @property {number} LSB - The least significant byte of the pitch wheel value.
*/
/**
* @typedef {Object} ChannelPressureCallback
* @property {number} channel - The MIDI channel number.
* @property {number} pressure - The pressure value.
*/
/**
* @typedef {Error} SoundfontErrorCallback - The error message for soundfont errors.
*/
/**
* @typedef {
* NoteOnCallback |
* NoteOffCallback |
* DrumChangeCallback |
* ProgramChangeCallback |
* ControllerChangeCallback |
* MuteChannelCallback |
* PresetListChangeCallback |
* PitchWheelCallback |
* SoundfontErrorCallback |
* ChannelPressureCallback |
* SynthDisplayCallback |
* undefined
* } EventCallbackData
*/
/**
* @typedef {
* "noteon"|
* "noteoff"|
* "pitchwheel"|
* "controllerchange"|
* "programchange"|
* "channelpressure"|
* "polypressure" |
* "drumchange"|
* "stopall"|
* "newchannel"|
* "mutechannel"|
* "presetlistchange"|
* "allcontrollerreset"|
* "soundfonterror"|
* "synthdisplay"} EventTypes
*/
export class EventHandler
{
/**
* A new synthesizer event handler
*/
constructor()
{
/**
* The main list of events
* @type {Object<EventTypes, Object<string, function(EventCallbackData)>>}
*/
this.events = {
"noteoff": {}, // called on note off message
"noteon": {}, // called on note on message
"pitchwheel": {}, // called on pitch wheel change
"controllerchange": {}, // called on controller change
"programchange": {}, // called on program change
"channelpressure": {}, // called on channel pressure message
"polypressure": {}, // called on poly pressure message
"drumchange": {}, // called when channel type changes
"stopall": {}, // called when synth receives stop all command
"newchannel": {}, // called when a new channel is created
"mutechannel": {}, // called when a channel is muted/unmuted
"presetlistchange": {}, // called when the preset list changes (soundfont gets reloaded)
"allcontrollerreset": {}, // called when all controllers are reset
"soundfonterror": {}, // called when a soundfont parsing error occurs
"synthdisplay": {} // called when there's a SysEx message to display some text
};
/**
* Set to 0 to disabled, otherwise in seconds
* @type {number}
*/
this.timeDelay = 0;
}
/**
* Adds a new event listener
* @param name {EventTypes}
* @param id {string} the unique identifier for the event (to delete it
* @param callback {function(EventCallbackData)}
*/
addEvent(name, id, callback)
{
this.events[name][id] = callback;
}
/**
* Removes an event listener
* @param name {EventTypes}
* @param id {string}
*/
removeEvent(name, id)
{
delete this.events[name][id];
}
/**
* Calls the given event
* @param name {EventTypes}
* @param eventData {EventCallbackData}
*/
callEvent(name, eventData)
{
if (this.events[name])
{
if (this.timeDelay > 0)
{
setTimeout(() =>
{
Object.values(this.events[name]).forEach(ev =>
{
try
{
ev(eventData);
}
catch (e)
{
console.error(`Error while executing an event callback for ${name}:`, e);
}
});
}, this.timeDelay * 1000);
}
else
{
Object.values(this.events[name]).forEach(ev =>
{
try
{
ev(eventData);
}
catch (e)
{
console.error(`Error while executing an event callback for ${name}:`, e);
}
}
);
}
}
}
} |