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ha-web-rtc-player.ts
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ha-web-rtc-player.ts
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/* eslint-disable no-console */
import {
css,
CSSResultGroup,
html,
LitElement,
PropertyValues,
TemplateResult,
} from "lit";
import { customElement, property, query, state } from "lit/decorators";
import { ifDefined } from "lit/directives/if-defined";
import { fireEvent } from "../common/dom/fire_event";
import {
fetchWebRtcClientConfiguration,
handleWebRtcOffer,
WebRtcAnswer,
} from "../data/camera";
import type { HomeAssistant } from "../types";
import "./ha-alert";
/**
* A WebRTC stream is established by first sending an offer through a signal
* path via an integration. An answer is returned, then the rest of the stream
* is handled entirely client side.
*/
@customElement("ha-web-rtc-player")
class HaWebRtcPlayer extends LitElement {
@property({ attribute: false }) public hass!: HomeAssistant;
@property() public entityid!: string;
@property({ type: Boolean, attribute: "controls" })
public controls = false;
@property({ type: Boolean, attribute: "muted" })
public muted = false;
@property({ type: Boolean, attribute: "autoplay" })
public autoPlay = false;
@property({ type: Boolean, attribute: "playsinline" })
public playsInline = false;
@property({ attribute: "poster-url" }) public posterUrl?: string;
@state() private _error?: string;
@query("#remote-stream", true) private _videoEl!: HTMLVideoElement;
private _peerConnection?: RTCPeerConnection;
private _remoteStream?: MediaStream;
protected override render(): TemplateResult {
if (this._error) {
return html`<ha-alert alert-type="error">${this._error}</ha-alert>`;
}
return html`
<video
id="remote-stream"
?autoplay=${this.autoPlay}
.muted=${this.muted}
?playsinline=${this.playsInline}
?controls=${this.controls}
poster=${ifDefined(this.posterUrl)}
@loadeddata=${this._loadedData}
></video>
`;
}
public override connectedCallback() {
super.connectedCallback();
if (this.hasUpdated) {
this._startWebRtc();
}
}
public override disconnectedCallback() {
super.disconnectedCallback();
this._cleanUp();
}
protected override updated(changedProperties: PropertyValues<this>) {
if (!changedProperties.has("entityid")) {
return;
}
this._startWebRtc();
}
private async _startWebRtc(): Promise<void> {
console.time("WebRTC");
this._error = undefined;
console.timeLog("WebRTC", "start clientConfig");
const clientConfig = await fetchWebRtcClientConfiguration(
this.hass,
this.entityid
);
console.timeLog("WebRTC", "end clientConfig", clientConfig);
const peerConnection = new RTCPeerConnection(clientConfig.configuration);
if (clientConfig.dataChannel) {
// Some cameras (such as nest) require a data channel to establish a stream
// however, not used by any integrations.
peerConnection.createDataChannel(clientConfig.dataChannel);
}
peerConnection.addTransceiver("audio", { direction: "recvonly" });
peerConnection.addTransceiver("video", { direction: "recvonly" });
const offerOptions: RTCOfferOptions = {
offerToReceiveAudio: true,
offerToReceiveVideo: true,
};
console.timeLog("WebRTC", "start createOffer", offerOptions);
const offer: RTCSessionDescriptionInit =
await peerConnection.createOffer(offerOptions);
console.timeLog("WebRTC", "end createOffer", offer);
console.timeLog("WebRTC", "start setLocalDescription");
await peerConnection.setLocalDescription(offer);
console.timeLog("WebRTC", "end setLocalDescription");
console.timeLog("WebRTC", "start iceResolver");
let candidates = ""; // Build an Offer SDP string with ice candidates
const iceResolver = new Promise<void>((resolve) => {
peerConnection.addEventListener("icecandidate", (event) => {
if (!event.candidate?.candidate) {
resolve(); // Gathering complete
return;
}
console.timeLog("WebRTC", "iceResolver candidate", event.candidate);
candidates += `a=${event.candidate.candidate}\r\n`;
});
});
await iceResolver;
console.timeLog("WebRTC", "end iceResolver", candidates);
const offer_sdp = offer.sdp! + candidates;
let webRtcAnswer: WebRtcAnswer;
try {
console.timeLog("WebRTC", "start WebRTCOffer", offer_sdp);
webRtcAnswer = await handleWebRtcOffer(
this.hass,
this.entityid,
offer_sdp
);
console.timeLog("WebRTC", "end webRtcOffer", webRtcAnswer);
} catch (err: any) {
this._error = "Failed to start WebRTC stream: " + err.message;
peerConnection.close();
return;
}
// Setup callbacks to render remote stream once media tracks are discovered.
const remoteStream = new MediaStream();
peerConnection.addEventListener("track", (event) => {
console.timeLog("WebRTC", "track", event);
remoteStream.addTrack(event.track);
this._videoEl.srcObject = remoteStream;
});
this._remoteStream = remoteStream;
// Initiate the stream with the remote device
const remoteDesc = new RTCSessionDescription({
type: "answer",
sdp: webRtcAnswer.answer,
});
try {
console.timeLog("WebRTC", "start setRemoteDescription", remoteDesc);
await peerConnection.setRemoteDescription(remoteDesc);
console.timeLog("WebRTC", "end setRemoteDescription");
} catch (err: any) {
this._error = "Failed to connect WebRTC stream: " + err.message;
peerConnection.close();
return;
}
this._peerConnection = peerConnection;
}
private _cleanUp() {
if (this._remoteStream) {
this._remoteStream.getTracks().forEach((track) => {
track.stop();
});
this._remoteStream = undefined;
}
if (this._videoEl) {
this._videoEl.removeAttribute("src");
this._videoEl.load();
}
if (this._peerConnection) {
this._peerConnection.close();
this._peerConnection = undefined;
}
}
private _loadedData() {
console.timeLog("WebRTC", "loadedData");
console.timeEnd("WebRTC");
// @ts-ignore
fireEvent(this, "load");
}
static get styles(): CSSResultGroup {
return css`
:host,
video {
display: block;
}
video {
width: 100%;
max-height: var(--video-max-height, calc(100vh - 97px));
}
`;
}
}
declare global {
interface HTMLElementTagNameMap {
"ha-web-rtc-player": HaWebRtcPlayer;
}
}