78 lines
3.1 KiB
TypeScript
78 lines
3.1 KiB
TypeScript
/*
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Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {Stream, Track, TrackKind} from "../../types/MediaDevices";
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import {WebRTC, Sender, PeerConnection} from "../../types/WebRTC";
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import {SDPStreamMetadataPurpose} from "../../../matrix/calls/callEventTypes";
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const POLLING_INTERVAL = 200; // ms
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export const SPEAKING_THRESHOLD = -60; // dB
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const SPEAKING_SAMPLE_COUNT = 8; // samples
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export class DOMWebRTC implements WebRTC {
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createPeerConnection(forceTURN: boolean, turnServers: RTCIceServer[], iceCandidatePoolSize): PeerConnection {
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const peerConn = new RTCPeerConnection({
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iceTransportPolicy: forceTURN ? 'relay' : undefined,
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iceServers: turnServers,
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iceCandidatePoolSize: iceCandidatePoolSize,
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}) as PeerConnection;
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return new Proxy(peerConn, {
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get(target, prop, receiver) {
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if (prop === "close") {
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console.trace("calling peerConnection.close");
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}
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const value = target[prop];
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if (typeof value === "function") {
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return value.bind(target);
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} else {
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return value;
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}
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}
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});
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}
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prepareSenderForPurpose(peerConnection: PeerConnection, sender: Sender, purpose: SDPStreamMetadataPurpose): void {
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if (purpose === SDPStreamMetadataPurpose.Screenshare) {
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this.getRidOfRTXCodecs(peerConnection as RTCPeerConnection, sender as RTCRtpSender);
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}
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}
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private getRidOfRTXCodecs(peerConnection: RTCPeerConnection, sender: RTCRtpSender): void {
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// RTCRtpReceiver.getCapabilities and RTCRtpSender.getCapabilities don't seem to be supported on FF
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if (!RTCRtpReceiver.getCapabilities || !RTCRtpSender.getCapabilities) return;
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const recvCodecs = RTCRtpReceiver.getCapabilities("video")?.codecs ?? [];
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const sendCodecs = RTCRtpSender.getCapabilities("video")?.codecs ?? [];
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const codecs = [...sendCodecs, ...recvCodecs];
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for (const codec of codecs) {
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if (codec.mimeType === "video/rtx") {
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const rtxCodecIndex = codecs.indexOf(codec);
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codecs.splice(rtxCodecIndex, 1);
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}
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}
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const transceiver = peerConnection.getTransceivers().find(t => t.sender === sender);
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if (transceiver && (
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transceiver.sender.track?.kind === "video" ||
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transceiver.receiver.track?.kind === "video"
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)
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) {
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transceiver.setCodecPreferences(codecs);
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}
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}
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}
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