71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
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// @flow
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import JitsiMeetJS from '../../base/lib-jitsi-meet';
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import { MEDIA_TYPE } from '../../base/media';
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/**
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* Class Implementing the effect interface expected by a JitsiLocalTrack.
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* The AudioMixerEffect, as the name implies, mixes two JitsiLocalTracks containing a audio track. First track is
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* provided at the moment of creation, second is provided through the effect interface.
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*/
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export class AudioMixerEffect {
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/**
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* JitsiLocalTrack that is going to be mixed into the track that uses this effect.
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*/
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_mixAudio: Object;
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/**
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* lib-jitsi-meet AudioMixer.
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*/
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_audioMixer: Object;
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/**
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* Creates AudioMixerEffect.
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*
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* @param {JitsiLocalTrack} mixAudio - JitsiLocalTrack which will be mixed with the original track.
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*/
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constructor(mixAudio: Object) {
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if (mixAudio.getType() !== MEDIA_TYPE.AUDIO) {
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throw new Error('AudioMixerEffect only supports audio JitsiLocalTracks; effect will not work!');
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}
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this._mixAudio = mixAudio;
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}
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/**
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* Checks if the JitsiLocalTrack supports this effect.
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*
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* @param {JitsiLocalTrack} sourceLocalTrack - Track to which the effect will be applied.
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* @returns {boolean} - Returns true if this effect can run on the specified track, false otherwise.
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*/
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isEnabled(sourceLocalTrack: Object) {
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// Both JitsiLocalTracks need to be audio i.e. contain an audio MediaStreamTrack
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return sourceLocalTrack.isAudioTrack() && this._mixAudio.isAudioTrack();
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}
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/**
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* Effect interface called by source JitsiLocalTrack, At this point a WebAudio ChannelMergerNode is created
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* and and the two associated MediaStreams are connected to it; the resulting mixed MediaStream is returned.
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*
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* @param {MediaStream} audioStream - Audio stream which will be mixed with _mixAudio.
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* @returns {MediaStream} - MediaStream containing both audio tracks mixed together.
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*/
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startEffect(audioStream: MediaStream) {
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this._audioMixer = JitsiMeetJS.createAudioMixer();
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this._audioMixer.addMediaStream(this._mixAudio.getOriginalStream());
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this._audioMixer.addMediaStream(audioStream);
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return this._audioMixer.start();
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}
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/**
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* Reset the AudioMixer stopping it in the process.
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*
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* @returns {void}
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*/
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stopEffect() {
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this._audioMixer.reset();
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}
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}
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