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ReceiveRemoteVideoPauseResumeTask.ts
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ReceiveRemoteVideoPauseResumeTask.ts
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
import AudioVideoControllerState from '../audiovideocontroller/AudioVideoControllerState';
import RemovableObserver from '../removableobserver/RemovableObserver';
import SignalingClientEvent from '../signalingclient/SignalingClientEvent';
import SignalingClientEventType from '../signalingclient/SignalingClientEventType';
import SignalingClientObserver from '../signalingclientobserver/SignalingClientObserver';
import { SdkPauseResumeFrame, SdkSignalFrame } from '../signalingprotocol/SignalingProtocol.js';
import VideoDownlinkObserver from '../videodownlinkbandwidthpolicy/VideoDownlinkObserver';
import BaseTask from './BaseTask';
/*
* [[ReceiveRemoteVideoPauseResume]] receives [[SdkPauseFrame]] from the server side (only if
* `VideoDownlinkBandwidthPolicy.getServerSideNetworkAdaption()` == `BandwidthProbingAndRemoteVideoQualityAdaption`)
* which indicates remote video sources that have been paused or resumed and updates [[VideoDownlinkBandwidthPolicy]]
* and [[VideoTileController]]
*/
export default class ReceiveRemoteVideoPauseResume
extends BaseTask
implements SignalingClientObserver, RemovableObserver {
protected taskName = 'ReceiveRemoteVideoPauseResume';
private serverPausedVideoTileIds = new Set<number>();
constructor(private context: AudioVideoControllerState) {
super(context.logger);
}
removeObserver(): void {
this.context.signalingClient.removeObserver(this);
}
async run(): Promise<void> {
this.context.signalingClient.registerObserver(this);
this.context.removableObservers.push(this);
}
handleSignalingClientEvent(event: SignalingClientEvent): void {
if (
event.type !== SignalingClientEventType.ReceivedSignalFrame ||
(event.message.type !== SdkSignalFrame.Type.PAUSE &&
event.message.type !== SdkSignalFrame.Type.RESUME)
) {
return;
}
// @ts-ignore: force cast to SdkPauseFrame
const pauseResumeFrame: SdkPauseResumeFrame = event.message.pause;
const messageType = event.message.type;
this.context.logger.info(
`received new ${
messageType === SdkSignalFrame.Type.PAUSE ? 'pause' : 'resume'
} frame: ${JSON.stringify(pauseResumeFrame)}`
);
if (
!pauseResumeFrame ||
this.context.videoTileController.getVideoTileForAttendeeId === undefined ||
this.context.videoDownlinkBandwidthPolicy.forEachObserver === undefined ||
this.context.videoStreamIndex.attendeeIdForGroupId === undefined
) {
return;
}
const tiles = pauseResumeFrame.groupIds.map((groupId: number) => {
const attendeeId = this.context.videoStreamIndex.attendeeIdForGroupId(groupId);
return this.context.videoTileController.getVideoTileForAttendeeId(attendeeId);
});
for (const tile of tiles) {
if (tile === undefined) {
continue;
}
if (messageType === SdkSignalFrame.Type.PAUSE) {
if (!tile.state().paused) {
this.serverPausedVideoTileIds.add(tile.id());
this.context.videoDownlinkBandwidthPolicy.forEachObserver(
(observer: VideoDownlinkObserver) => {
observer.tileWillBePausedByDownlinkPolicy(tile.id());
}
);
// This circumvents the tile controller so it will not send
// any signaling messages to server side.
tile.pause();
}
} else {
if (tile.state().paused && this.serverPausedVideoTileIds.has(tile.id())) {
this.serverPausedVideoTileIds.delete(tile.id());
this.context.videoDownlinkBandwidthPolicy.forEachObserver(
(observer: VideoDownlinkObserver) => {
observer.tileWillBeUnpausedByDownlinkPolicy(tile.id());
}
);
// See comment above.
tile.unpause();
}
}
}
}
}