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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| namespace SFX { | ||
|
|
||
| const bitrate = 44100; | ||
| const keys = { c: 0, db: 1, d: 2, eb: 3, e: 4, f: 5, gb: 6, g: 7, ab: 8, a: 9, bb: 10, b: 11 }; | ||
| const freq = []; | ||
| const out = new AudioContext(); | ||
| const ctx = new OfflineAudioContext(1, bitrate * 2, bitrate); | ||
| const noise = ctx.createBuffer(1, bitrate * 2, bitrate); | ||
| const output = noise.getChannelData(0); | ||
| const buffers : { [id: string]: AudioBuffer } = {}; | ||
| const gains: { [id: string]: GainNode } = {}; | ||
|
|
||
| let a = Math.pow(2, 1 / 12); | ||
| for (let n = -57; n < 50; n++) { | ||
| freq.push(Math.round(Math.pow(a, n) * 44000) / 100); | ||
| } | ||
|
|
||
| for (let i = 0; i < bitrate * 2; i++) { | ||
| output[i] = Math.random() * 2 - 1; | ||
| } | ||
|
|
||
| export class Sound { | ||
|
|
||
| type: OscillatorType; | ||
| curve: Float32Array; | ||
| length: number; | ||
|
|
||
| constructor(type: OscillatorType, curve: number[], length: number) { | ||
| this.type = type; | ||
| this.curve = Float32Array.from(curve); | ||
| this.length = length; | ||
| } | ||
|
|
||
| time(max): number { | ||
| return max < this.length ? max - .01 : this.length; | ||
| } | ||
|
|
||
| async render(id: string, freq: number[], time: number): Promise<void> { | ||
| let ctx = new OfflineAudioContext(1, bitrate * time, bitrate), | ||
| vol = ctx.createGain(), | ||
| curve = Float32Array.from(freq); | ||
| vol.gain.value = 1; | ||
| vol.connect(ctx.destination); | ||
| if (this.curve) { | ||
| vol.gain.setValueCurveAtTime(this.curve, 0, this.time(time)); | ||
| } | ||
| if (this.type == 'custom') { | ||
| let src = ctx.createBufferSource(), | ||
| filter = ctx.createBiquadFilter(); | ||
| filter.connect(vol); | ||
| filter.detune.setValueCurveAtTime(curve, 0, time); | ||
| src.buffer = noise; | ||
| src.loop = true; | ||
| src.connect(filter); | ||
| src.start(); | ||
| } else { | ||
| let osc = ctx.createOscillator(); | ||
| osc.type = this.type; | ||
| osc.frequency.setValueCurveAtTime(curve, 0, time); | ||
| osc.connect(vol); | ||
| osc.start(); | ||
| osc.stop(time); | ||
| } | ||
| buffers[id] = await ctx.startRendering(); | ||
| } | ||
|
|
||
| } | ||
|
|
||
| export class Channel { | ||
|
|
||
| inst: Sound; | ||
| data: number[][]; | ||
| size: number; | ||
| length: number; | ||
|
|
||
| constructor(inst: Sound, notes: string, tempo: number) { | ||
| this.inst = inst; | ||
| this.data = []; | ||
| this.size = 0; | ||
| this.length = 0; | ||
| let sheet = notes.split('|'); | ||
| if (sheet.length > 1) { | ||
| notes = ''; | ||
| for (let i = 0; i < sheet.length; i++) { | ||
| notes += i % 2 | ||
| ? (',' + sheet[i-1]).repeat(parseInt(sheet[i]) - 1) | ||
| : (notes ? ',' : '') + sheet[i]; | ||
| } | ||
| } | ||
| notes.split(',').forEach((code) => { | ||
| let div = code.match(/^(\d+)/), | ||
| freqs = code.match(/([a-z]+\d+)/g); | ||
| if (div) { | ||
| let time = tempo / parseInt(div[1]), | ||
| row = [time]; | ||
| this.length += time; | ||
| if (freqs) { | ||
| if (freqs.length > this.size) { | ||
| this.size = freqs.length; | ||
| } | ||
| for (let i = 0; i < freqs.length; i++) { | ||
| let note = freqs[i].match(/([a-z]+)(\d+)/); | ||
| if (note) { | ||
| row.push(freq[parseInt(note[2]) * 12 + keys[note[1]]]); | ||
| } | ||
| } | ||
| } | ||
| this.data.push(row); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| play(ctx: OfflineAudioContext) { | ||
| let length = 0, | ||
| inst = this.inst, | ||
| vol = ctx.createGain(), | ||
| osc = []; | ||
| vol.gain.value = 1; | ||
| vol.connect(ctx.destination); | ||
| for (let i = 0; i < this.size; i++) { | ||
| osc[i] = ctx.createOscillator(); | ||
| osc[i].type = inst.type; | ||
| osc[i].connect(vol); | ||
| } | ||
| this.data.forEach(note => { | ||
| if (inst.curve) { | ||
| vol.gain.setValueCurveAtTime(inst.curve, length, inst.time(note[0])); | ||
| } | ||
| osc.forEach((o, i) => { | ||
| o.frequency.setValueAtTime(note[i + 1] || 0, length); | ||
| }); | ||
| length += note[0]; | ||
| }); | ||
| osc.forEach(o => { | ||
| o.start(); | ||
| o.stop(length); | ||
| }); | ||
| } | ||
|
|
||
| } | ||
|
|
||
| export async function render(id: string, channels: Channel[]): Promise<void> { | ||
| let length = 0; | ||
| channels.forEach(channel => { | ||
| if (channel.length > length) { | ||
| length = channel.length; | ||
| } | ||
| }); | ||
| const ctx = new OfflineAudioContext(1, bitrate * length, bitrate); | ||
| channels.forEach((channel, i) => { | ||
| channel.play(ctx); | ||
| }); | ||
| buffers[id] = await ctx.startRendering(); | ||
| } | ||
|
|
||
| export function mixer(id: string): GainNode { | ||
| if (!(id in gains)) { | ||
| gains[id] = out.createGain(); | ||
| gains[id].connect(out.destination); | ||
| } | ||
| return gains[id]; | ||
| } | ||
|
|
||
| export async function play(id: string, loop: boolean = false, mixerId: string = 'master'): Promise<AudioBufferSourceNode> { | ||
| await out.resume(); | ||
| if (id in buffers) { | ||
| let src = out.createBufferSource(); | ||
| if (loop) { | ||
| src.loop = true; | ||
| } | ||
| src.buffer = buffers[id]; | ||
| src.connect(mixer(mixerId)); | ||
| src.start(); | ||
| return src; | ||
| } | ||
| return null; | ||
| } | ||
| } |
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