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import {DEFAULT_LENGTH, DEFAULT_FREQUENCY, NOTE_DELIMITER, PARAMETER_DELIMITER} from './config' |
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import Tone from './Tone' |
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/** |
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* @class Beep utility |
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* @name Beep |
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*/ |
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export class Beep { |
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frequency: number |
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length: number |
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repeats: number |
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/** |
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* Initialize a beep. |
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*/ |
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constructor(frequency: number=DEFAULT_FREQUENCY, length: number=DEFAULT_LENGTH, repeats=0) { |
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this.frequency = frequency |
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this.length = length |
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this.repeats = repeats |
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} |
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/** |
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* The text representation. |
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*/ |
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toString(): string { |
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return `Beep(${this.frequency} ${this.length} ${this.repeats})` |
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} |
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} |
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/** |
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* @class Beep sequence |
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* @name BeepSequence |
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*/ |
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export class BeepSequence { |
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beeps: Beep[] |
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/** |
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* Initialize a beep sequence. |
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*/ |
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constructor(beeps: Beep[]) { |
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this.beeps = beeps |
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} |
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/** |
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* Return the URL hash for the sequence. |
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* Each note is "frequency (Hz), length (ms), repeats" separated by "|", with defaults (440 200 1). |
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* Notes are separated by ",". |
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*/ |
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toHash(): string { |
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const notes: string[] = [] |
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for (const beep of this.beeps) { |
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notes.push(`${beep.frequency}${PARAMETER_DELIMITER}${beep.length}`) |
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} |
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return notes.join(NOTE_DELIMITER) |
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} |
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/** |
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* Return the `beep` command. |
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*/ |
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toBeepCommand(): string { |
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const notes: string[] = [] |
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for (const beep of this.beeps) { |
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notes.push(`-f ${beep.frequency} -l ${beep.length}`) |
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} |
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return `beep ${notes.join(' -n ')}` |
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} |
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/** |
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* Return the GRUB init tune. |
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*/ |
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toGRUBInitTune(): string { |
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const notes: string[] = [] |
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for (const beep of this.beeps) { |
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notes.push(`${beep.frequency} ${beep.length/100}`) |
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} |
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return `play ${notes.join(' ')}` |
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} |
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/** |
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* The text representation. |
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*/ |
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toString(): string { |
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return `${this.constructor.name}(${this.toHash()})` |
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} |
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/** |
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* The length of the playtime in seconds. |
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*/ |
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lengthInSeconds(): number { |
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let s = 0 |
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for (const beep of this.beeps) { |
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for (let r=-1; r<beep.repeats; r++) { |
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s += beep.length |
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} |
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} |
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return s * .001 |
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} |
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} |
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/** |
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* Play a beep sequence to the browser audio. |
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*/ |
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/* istanbul ignore next */ |
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export const playBeepSequence = (bs: BeepSequence): void => { |
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if (typeof window === 'undefined') return |
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let wait = 0 |
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const tone = new Tone() |
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for (const beep of bs.beeps) { |
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const seconds = beep.length * .001 |
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tone.beepOnBeepOff(beep.frequency, seconds, wait) |
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wait += seconds |
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} |
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} |
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/** |
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* Play the default beep. |
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*/ |
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export const playDefaultBeep = (): void => { |
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playBeepSequence(new BeepSequence([new Beep()])) |
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} |
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/** |
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* Parse a Linux "beep" command. |
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*/ |
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export const parseBeepCommand = (s: string): Beep => { |
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1 |
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return new Beep(s.length) |
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} |
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/** |
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* Parse a Grub init tune "play" line. |
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*/ |
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2 |
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export const parseGRUBInitTune = (s: string): Beep => { |
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1 |
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return new Beep(s.length) |
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} |
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export default Beep |
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Beepody /
beepody
