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| 1 | +import { selectDominantSpeaker } from "@100mslive/hms-video-store"; |
| 2 | + |
| 3 | +class PeersSorter { |
| 4 | + listeners = new Set(); |
| 5 | + storeUnsubscribe; |
| 6 | + |
| 7 | + constructor(store) { |
| 8 | + this.store = store; |
| 9 | + this.peers = new Map(); |
| 10 | + this.lruPeers = new Set(); |
| 11 | + this.speaker = undefined; |
| 12 | + } |
| 13 | + |
| 14 | + setPeersAndTilesPerPage = ({ peers, tilesPerPage }) => { |
| 15 | + this.tilesPerPage = tilesPerPage; |
| 16 | + const peerIds = new Set(peers.map(peer => peer.id)); |
| 17 | + // remove existing peers which are no longer provided |
| 18 | + this.peers.forEach((_, key) => { |
| 19 | + if (!peerIds.has(key)) { |
| 20 | + this.peers.delete(key); |
| 21 | + } |
| 22 | + }); |
| 23 | + this.lruPeers = new Set( |
| 24 | + [...this.lruPeers].filter(peerId => peerIds.has(peerId)) |
| 25 | + ); |
| 26 | + peers.forEach(peer => { |
| 27 | + this.peers.set(peer.id, peer); |
| 28 | + if (this.lruPeers.size < tilesPerPage) { |
| 29 | + this.lruPeers.add(peer.id); |
| 30 | + } |
| 31 | + }); |
| 32 | + if (!this.storeUnsubscribe) { |
| 33 | + this.storeUnsubscribe = this.store.subscribe( |
| 34 | + this.onDominantSpeakerChange, |
| 35 | + selectDominantSpeaker |
| 36 | + ); |
| 37 | + } |
| 38 | + this.moveSpeakerToFront(this.speaker); |
| 39 | + }; |
| 40 | + |
| 41 | + onUpdate = cb => { |
| 42 | + this.listeners.add(cb); |
| 43 | + }; |
| 44 | + |
| 45 | + stop = () => { |
| 46 | + this.updateListeners(); |
| 47 | + this.listeners.clear(); |
| 48 | + this.storeUnsubscribe?.(); |
| 49 | + }; |
| 50 | + |
| 51 | + moveSpeakerToFront = speaker => { |
| 52 | + if (!speaker) { |
| 53 | + this.updateListeners(); |
| 54 | + return; |
| 55 | + } |
| 56 | + if ( |
| 57 | + this.lruPeers.has(speaker.id) && |
| 58 | + this.lruPeers.size <= this.tilesPerPage |
| 59 | + ) { |
| 60 | + this.updateListeners(); |
| 61 | + return; |
| 62 | + } |
| 63 | + // delete to insert at beginning |
| 64 | + this.lruPeers.delete(speaker.id); |
| 65 | + let lruPeerArray = Array.from(this.lruPeers); |
| 66 | + while (lruPeerArray.length >= this.tilesPerPage) { |
| 67 | + lruPeerArray.pop(); |
| 68 | + } |
| 69 | + this.lruPeers = new Set([speaker.id, ...lruPeerArray]); |
| 70 | + this.updateListeners(); |
| 71 | + }; |
| 72 | + |
| 73 | + onDominantSpeakerChange = speaker => { |
| 74 | + if (speaker && speaker.id !== this?.speaker?.id) { |
| 75 | + this.speaker = speaker; |
| 76 | + this.moveSpeakerToFront(speaker); |
| 77 | + } |
| 78 | + }; |
| 79 | + |
| 80 | + updateListeners = () => { |
| 81 | + const orderedPeers = []; |
| 82 | + this.lruPeers.forEach(key => { |
| 83 | + const peer = this.peers.get(key); |
| 84 | + if (peer) { |
| 85 | + orderedPeers.push(peer); |
| 86 | + } |
| 87 | + }); |
| 88 | + this.peers.forEach(peer => { |
| 89 | + if (!this.lruPeers.has(peer.id) && peer) { |
| 90 | + orderedPeers.push(peer); |
| 91 | + } |
| 92 | + }); |
| 93 | + this.listeners.forEach(listener => listener?.(orderedPeers)); |
| 94 | + }; |
| 95 | +} |
| 96 | + |
| 97 | +export default PeersSorter; |
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