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Migrated LiteMode/LiteModeContext #2661

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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,9 @@ import { getLogger } from '@jitsi/logger';

import RTCEvents from '../../service/RTC/RTCEvents';
import FeatureFlags from '../flags/FeatureFlags';
import JitsiConference from '../../JitsiConference';
import JitsiRemoteTrack from '../RTC/JitsiRemoteTrack';
import TraceablePeerConnection from '../RTC/TraceablePeerConnection';

// Flag to set on receivers to avoid setting up the lite mode
// more than once.
Expand All @@ -14,44 +17,46 @@ const logger = getLogger(__filename);
* This module implements a discard-all insertable stream. Use to reduce decoder CPU load for testing.
*/
export class LiteModeContext {
enabled :boolean;
/**
* A constructor.
* @param {JitsiConference} conference - The conference instance for which lite mode is to be enabled.
*/
constructor(conference) {
constructor(conference:JitsiConference) {
this.enabled = FeatureFlags.isRunInLiteModeEnabled();
if (!this.enabled) {
return;
}

conference.rtc.on(
RTCEvents.REMOTE_TRACK_ADDED,
(track, tpc) => this._setupLiteModeForTrack(tpc, track));
(track:JitsiRemoteTrack, tpc:TraceablePeerConnection) => this._setupLiteModeForTrack(tpc, track));
}

/**
* Setup Lite Mode for a track.
*
* @private
*/
_setupLiteModeForTrack(tpc, track) {
_setupLiteModeForTrack(tpc:TraceablePeerConnection, track:JitsiRemoteTrack) {
if (!this.enabled) {
return;
}

const receiver = tpc.findReceiverForTrack(track.track);
const receiver = tpc.findReceiverForTrack(track.track) as RTCRtpReceiver & { createEncodedStreams: () => {
readable: ReadableStream<RTCEncodedAudioFrame | RTCEncodedVideoFrame>; writable: WritableStream<RTCEncodedAudioFrame | RTCEncodedVideoFrame>; }
};

if (!receiver) {
logger.warn(`Could not set up lite mode for ${track}: receiver not found in: ${tpc}`);

return;
}

if (receiver[kJitsiLiteMode]) {
return;
}
receiver[kJitsiLiteMode] = true;

const receiverStreams = receiver.createEncodedStreams();

const transformStream = new TransformStream({
Expand Down