[mirotalksfu] - improve getMicrophoneVolumeIndicator

public/js/Room.js

@@ -401,6 +401,7 @@ function addChild(device, els) {
 // ####################################################
 
 function getMicrophoneVolumeIndicator(stream) {
+    if (isAudioContextSupported() && hasAudioTrack(stream)) {
         stopMicrophoneProcessing();
         const audioContext = new (window.AudioContext || window.webkitAudioContext)();
         const microphone = audioContext.createMediaStreamSource(stream);
@@ -417,6 +418,7 @@ function getMicrophoneVolumeIndicator(stream) {
         };
         microphone.connect(scriptProcessor);
         scriptProcessor.connect(audioContext.destination);
+    }
 }
 
 function stopMicrophoneProcessing() {
@@ -436,6 +438,20 @@ function updateVolumeIndicator(volume) {
     });
 }
 
+function isAudioContextSupported() {
+    return !!(window.AudioContext || window.webkitAudioContext);
+}
+
+function hasAudioTrack(mediaStream) {
+    const audioTracks = mediaStream.getAudioTracks();
+    return audioTracks.length > 0;
+}
+
+function hasVideoTrack(mediaStream) {
+    const videoTracks = mediaStream.getVideoTracks();
+    return videoTracks.length > 0;
+}
+
 // ####################################################
 // API CHECK
 // ####################################################