Add fallback method to log selected ICE candidate pairs when getSelectedCandidatePair() is not supported

Author: Yuqi Huang

examples/app.js

@@ -469,6 +469,39 @@ async function printPeerConnectionStateInfo(event, logPrefix, remoteClientId) {
                         console.debug(`Chosen candidate pair (${trackType || 'unknown'}):`, iceTransport.getSelectedCandidatePair());
                     iceTransport.onselectedcandidatepairchange = logSelectedCandidate;
                     logSelectedCandidate();
+                } else {
+                    // Find nominated candidate pair
+                    const nominatedPair = Array.from(stats.values()).find(report => 
+                    report.type === 'candidate-pair' && 
+                    report.nominated === true
+                    );
+            
+                    if (nominatedPair) {
+                        // Get local and remote candidate detailsl;                     
+                        const localCandidate = stats.get(nominatedPair.localCandidateId);
+                        const remoteCandidate = stats.get(nominatedPair.remoteCandidateId);
+                        
+                        if (localCandidate && remoteCandidate) {
+                            console.debug(`Chosen candidate pair (${trackType || 'unknown'}):`, {
+                                local: {
+                                    id: localCandidate.id,
+                                    address: localCandidate.address,
+                                    port: localCandidate.port,
+                                    type: localCandidate.candidateType,
+                                    protocol: localCandidate.protocol,
+                                    priority: localCandidate.priority
+                                },
+                                remote: {
+                                    id: remoteCandidate.id,
+                                    address: remoteCandidate.address,
+                                    port: remoteCandidate.port,
+                                    type: remoteCandidate.candidateType,
+                                    protocol: remoteCandidate.protocol,
+                                    priority: remoteCandidate.priority
+                                }
+                            });
+                        }
+                    }
                 }
             } else {
                 console.error('Failed to fetch the candidate pair!');