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Added the MIDI builder: create MIDI files from scratch! Initial DLS tests, currently unused!
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| export class BasicMIDI | ||
| { | ||
| constructor() | ||
| { | ||
| /** | ||
| * The time division of the sequence | ||
| * @type {number} | ||
| */ | ||
| this.timeDivision = 0; | ||
| /** | ||
| * The duration of the sequence, in seconds | ||
| * @type {number} | ||
| */ | ||
| this.duration = 0; | ||
| /** | ||
| * The tempo changes in the sequence, ordered from last to first | ||
| * @type {{ticks: number, tempo: number}[]} | ||
| */ | ||
| this.tempoChanges = [{ticks: 0, tempo: 120}]; | ||
| /** | ||
| * Contains the copyright strings | ||
| * @type {string} | ||
| */ | ||
| this.copyright = ""; | ||
|
|
||
| /** | ||
| * The amount of tracks in the sequence | ||
| * @type {number} | ||
| */ | ||
| this.tracksAmount = 0; | ||
|
|
||
| /** | ||
| * The lyrics of the sequence as binary chunks | ||
| * @type {Uint8Array[]} | ||
| */ | ||
| this.lyrics = []; | ||
|
|
||
| /** | ||
| * First note on of the MIDI file | ||
| * @type {number} | ||
| */ | ||
| this.firstNoteOn = 0; | ||
|
|
||
| /** | ||
| * The MIDI's key range | ||
| * @type {{min: number, max: number}} | ||
| */ | ||
| this.keyRange = { min: 0, max: 127 }; | ||
|
|
||
| /** | ||
| * The last voice (note on, off, cc change etc.) event tick | ||
| * @type {number} | ||
| */ | ||
| this.lastVoiceEventTick = 0; | ||
|
|
||
| /** | ||
| * Midi port numbers for each track | ||
| * @type {number[]} | ||
| */ | ||
| this.midiPorts = [0]; | ||
|
|
||
| /** | ||
| * Channel offsets for each port, using the SpessaSynth method | ||
| * @type {number[]} | ||
| */ | ||
| this.midiPortChannelOffsets = [0]; | ||
|
|
||
| /** | ||
| * All channels that each track uses | ||
| * @type {Set<number>[]} | ||
| */ | ||
| this.usedChannelsOnTrack = []; | ||
|
|
||
| /** | ||
| * The loop points (in ticks) of the sequence | ||
| * @type {{start: number, end: number}} | ||
| */ | ||
| this.loop = { start: 0, end: 0 }; | ||
|
|
||
| /** | ||
| * The sequence's name | ||
| * @type {string} | ||
| */ | ||
| this.midiName = ""; | ||
|
|
||
| /** | ||
| * The file name of the sequence, if provided in the MIDI class | ||
| * @type {string} | ||
| */ | ||
| this.fileName = ""; | ||
|
|
||
| /** | ||
| * The raw, encoded MIDI name. | ||
| * @type {Uint8Array} | ||
| */ | ||
| this.rawMidiName = undefined; | ||
|
|
||
| /** | ||
| * The MIDI's embedded soundfont | ||
| * @type {ArrayBuffer|undefined} | ||
| */ | ||
| this.embeddedSoundFont = undefined; | ||
|
|
||
| /** | ||
| * The MIDI file's format | ||
| * @type {number} | ||
| */ | ||
| this.format = 0; | ||
|
|
||
| /** | ||
| * The RMID Info data if RMID, otherwise undefined | ||
| * @type {Object<string, IndexedByteArray>} | ||
| */ | ||
| this.RMIDInfo = {}; | ||
| /** | ||
| * The bank offset for RMIDI | ||
| * @type {number} | ||
| */ | ||
| this.bankOffset = 0; | ||
|
|
||
| /** | ||
| * The actual track data of the MIDI file | ||
| * @type {MidiMessage[][]} | ||
| */ | ||
| this.tracks = []; | ||
| } | ||
|
|
||
| /** | ||
| * Coverts ticks to time in seconds | ||
| * @param ticks {number} | ||
| * @returns {number} | ||
| * @protected | ||
| */ | ||
| _ticksToSeconds(ticks) | ||
| { | ||
| if (ticks <= 0) { | ||
| return 0; | ||
| } | ||
|
|
||
| // find the last tempo change that has occured | ||
| let tempo = this.tempoChanges.find(v => v.ticks < ticks); | ||
|
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||
| let timeSinceLastTempo = ticks - tempo.ticks; | ||
| return this._ticksToSeconds(ticks - timeSinceLastTempo) + (timeSinceLastTempo * 60) / (tempo.tempo * this.timeDivision); | ||
| } | ||
| } |
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