Web

Output audio data

1. Enable audio data receiving callback.

   aliWebrtc.enableAudioVolumeIndicator = true;

   Note This interface can be opened at any time after instantiation.
2. Use the audio energy value callback.

   aliWebrtc.on("onAudioLevel", (data) => {
     console.log(data)
   })

   Note This callback can be invoked only after you call the enableAudioVolumeIndicator method to enable audio callbacks. After that, this callback returns the maximum volume of the audio track every second.

   Return value description:

   • After you ingest an audio stream, you can obtain the information about the audio stream in the returned array. The user ID for your audio stream is 0.
   • If you subscribe to remote audio streams, the returned array contains information about the remote audio streams.
   • The following table describes the parameters in the returned array.

     Parameter	Type	Description
     userId	String	The ID of the user who ingests the stream for an audio track. The user ID for your audio track is 0.
     displayName	String	The display name of the user.
     level	Number	The volume of the audio track. Valid values: 0 to 100.
     buffer	Array	The pulse-code modulation (PCM) audio data in each second.

3. Disable the audio data reception callback.
   If you need to stop receiving audio data, you can set Disable Audio Data Receiving.

   aliWebrtc.enableAudioVolumeIndicator = false;