135 lines
4.1 KiB
JavaScript
135 lines
4.1 KiB
JavaScript
import LocalPCLoopback from '/imports/ui/services/webrtc-base/local-pc-loopback';
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import browserInfo from '/imports/utils/browserInfo';
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let audioContext = null;
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let sourceContext = null;
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let contextDestination = null;
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let stubAudioElement = null;
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let delayNode = null;
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const useRTCLoopback = () => {
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const USE_RTC_LOOPBACK_CHR = window.meetingClientSettings.public.media.localEchoTest.useRtcLoopbackInChromium;
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return (browserInfo.isChrome || browserInfo.isEdge) && USE_RTC_LOOPBACK_CHR;
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};
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const createAudioRTCLoopback = () => new LocalPCLoopback({ audio: true });
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const cleanupDelayNode = () => {
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if (delayNode) {
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delayNode.disconnect();
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delayNode = null;
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}
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if (sourceContext) {
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sourceContext.disconnect();
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sourceContext = null;
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}
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if (audioContext) {
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audioContext.close();
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audioContext = null;
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}
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if (contextDestination) {
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contextDestination.disconnect();
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contextDestination = null;
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}
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if (stubAudioElement) {
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stubAudioElement.pause();
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stubAudioElement.srcObject = null;
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stubAudioElement = null;
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}
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};
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const addDelayNode = (stream) => {
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const MEDIA_TAG = window.meetingClientSettings.public.media.mediaTag;
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const {
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delayTime = 0.5,
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maxDelayTime = 2,
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} = window.meetingClientSettings.public.media.localEchoTest.delay;
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if (stream) {
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if (delayNode || audioContext || sourceContext) cleanupDelayNode();
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const audioElement = document.querySelector(MEDIA_TAG);
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// Workaround: attach the stream to a muted stub audio element to be able to play it in
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// Chromium-based browsers. See https://bugs.chromium.org/p/chromium/issues/detail?id=933677
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stubAudioElement = new Audio();
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stubAudioElement.muted = true;
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stubAudioElement.srcObject = stream;
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// Create a new AudioContext to be able to add a delay to the stream
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audioContext = new AudioContext();
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sourceContext = audioContext.createMediaStreamSource(stream);
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contextDestination = audioContext.createMediaStreamDestination();
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// Create a DelayNode to add a delay to the stream
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delayNode = new DelayNode(audioContext, { delayTime, maxDelayTime });
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// Connect the stream to the DelayNode and then to the MediaStreamDestinationNode
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// to be able to play the stream.
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sourceContext.connect(delayNode);
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delayNode.connect(contextDestination);
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delayNode.delayTime.setValueAtTime(delayTime, audioContext.currentTime);
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// Play the stream with the delay in the default audio element (remote-media)
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audioElement.srcObject = contextDestination.stream;
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}
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};
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const deattachEchoStream = () => {
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const MEDIA_TAG = window.meetingClientSettings.public.media.mediaTag;
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const {
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enabled: DELAY_ENABLED = true,
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} = window.meetingClientSettings.public.media.localEchoTest.delay;
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const audioElement = document.querySelector(MEDIA_TAG);
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if (DELAY_ENABLED) {
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audioElement.muted = false;
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cleanupDelayNode();
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}
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audioElement.pause();
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audioElement.srcObject = null;
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};
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const playEchoStream = async (stream, loopbackAgent = null) => {
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const MEDIA_TAG = window.meetingClientSettings.public.media.mediaTag;
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const {
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enabled: DELAY_ENABLED = true,
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} = window.meetingClientSettings.public.media.localEchoTest.delay;
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if (stream) {
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deattachEchoStream();
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let streamToPlay = stream;
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if (loopbackAgent) {
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// Chromium based browsers need audio to go through PCs for echo cancellation
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// to work. See https://bugs.chromium.org/p/chromium/issues/detail?id=687574
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try {
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await loopbackAgent.start(stream);
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streamToPlay = loopbackAgent.loopbackStream;
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} catch (error) {
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loopbackAgent.stop();
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}
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}
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if (DELAY_ENABLED) {
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addDelayNode(streamToPlay);
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} else {
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// No delay: play the stream in the default audio element (remote-media),
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// no strings attached.
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const audioElement = document.querySelector(MEDIA_TAG);
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audioElement.srcObject = streamToPlay;
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audioElement.muted = false;
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audioElement.play();
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}
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}
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};
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export default {
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useRTCLoopback,
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createAudioRTCLoopback,
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deattachEchoStream,
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playEchoStream,
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};
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