import * as PropertySymbol from '../../PropertySymbol.js'; import Crypto from 'crypto'; import EventTarget from '../../event/EventTarget.js'; import MediaStreamTrackEvent from '../../event/events/MediaStreamTrackEvent.js'; import MediaStreamTrack from './MediaStreamTrack.js'; /** * MediaStream. * * @see https://developer.mozilla.org/en-US/docs/Web/API/MediaStream */ export default class MediaStream extends EventTarget { // Public properties public active = true; public id: string = Crypto.randomUUID(); // Events public onaddtrack: (event: MediaStreamTrackEvent) => void | null = null; public onremovetrack: (event: MediaStreamTrackEvent) => void | null = null; // Internal properties public [PropertySymbol.tracks]: MediaStreamTrack[] = []; /** * Constructor. * * @param [streamOrTracks] Stream or tracks. */ constructor(streamOrTracks?: MediaStream | MediaStreamTrack[]) { super(); if (!this[PropertySymbol.window]) { throw new TypeError( `Failed to construct '${this.constructor.name}': '${this.constructor.name}' was constructed outside a Window context.` ); } if (streamOrTracks !== undefined) { this[PropertySymbol.tracks] = streamOrTracks instanceof MediaStream ? streamOrTracks[PropertySymbol.tracks].slice() : streamOrTracks; } } /** * Adds a track. * * @param track Track. */ public addTrack(track: MediaStreamTrack): void { if (this[PropertySymbol.tracks].includes(track)) { return; } this[PropertySymbol.tracks].push(track); this.dispatchEvent(new MediaStreamTrackEvent('addtrack', { track })); } /** * Returns a clone. * * @returns Clone. */ public clone(): MediaStream { return new (this.constructor)(this); } /** * Returns audio tracks. * * @returns Audio tracks. */ public getAudioTracks(): MediaStreamTrack[] { return this[PropertySymbol.tracks].filter((track) => track.kind === 'audio'); } /** * Returns track by id. * * @param id Id. * @returns Track. */ public getTrackById(id: string): MediaStreamTrack | null { for (const track of this[PropertySymbol.tracks]) { if (track.id === id) { return track; } } return null; } /** * Returns video tracks. * * @returns Video tracks. */ public getVideoTracks(): MediaStreamTrack[] { return this[PropertySymbol.tracks].filter((track) => track.kind === 'video'); } /** * Removes a track. * * @param track Track. */ public removeTrack(track: MediaStreamTrack): void { const index = this[PropertySymbol.tracks].indexOf(track); if (index === -1) { return; } this[PropertySymbol.tracks].splice(index, 1); this.dispatchEvent(new MediaStreamTrackEvent('removetrack', { track })); } }