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trtc.on(TRTC.EVENT.AUDIO_VOLUME, event => {
    event.result.forEach(({ userId, volume }) => {
        // When userId is an empty string, it represents the volume of the local microphone.
        const isMe = userId === ''; 
        if (isMe) {
            console.log(`my volume: ${volume}`);
        } else {
            console.log(`user: ${userId} volume: ${volume}`);
        }
    })
});

// Enable volume event and trigger the event every 500ms
trtc.enableAudioVolumeEvaluation(500);
// For performance reasons, when the page switches to the background, 
// the SDK will not throw volume callback events. If you need to receive volume event
// when the page is switched to the background, you can set the second parameter to true.
trtc.enableAudioVolumeEvaluation(500, true);

// To turn off the volume event, pass in an value less than or equal to 0
trtc.enableAudioVolumeEvaluation(-1);

const trtc = TRTC.create();
await trtc.startLocalAudio();

let isAudioMuted = false;
await trtc.updateLocalAudio({ mute: true });
isAudioMuted = true;

// create a new trtc instance for detecting the volume of microphone.
const trtcA = TRTC.create();
trtcA.enableAudioVolumeEvaluation();
trtcA.on(TRTC.EVENT.AUDIO_VOLUME, event => {
  event.result.forEach(item => {
      // 1. userId === '' is local volume.
      // 2. It is generally believed that when the volume is greater than 10, the user is talking, and you can also customize this threshold.
      if (item.userId === '' && item.volume > 10 && isAudioMuted) {
        // The user is speaking after microphone muted.
      }
    })
})
await trtcA.startLocalAudio();

// Increase the capture volume by setting captureVolume upper than 100.
await trtc.updateLocalAudio({ option: { captureVolume: 200 }});

// Decrease the capture volume by setting captureVolume below 100.
await trtc.updateLocalAudio({ option: { captureVolume: 50 }});
await trtc.updateLocalAudio({ option: { captureVolume: 0 }});

// Increase remote audio volume
await trtc.setRemoteAudioVolume('remote_user_id', 200);
// Decrease remote audio volume
await trtc.setRemoteAudioVolume('remote_user_id', 50);