Optimize Audio Track - iOS

While optimizing for the best listening experience, it is necessary to fine-tune the audio track that is being used during the calls.

For the best fine-tuning experience, we have introduced the ability to pass a custom audio track for the participant's media before and during the meeting.

Custom Audio Track

This feature can be used to create a custom Audio track for the Audio of the participants with different encoder configuration and send it to other participants.

How to Create Custom Audio Track ?

• You can create a Audio Track using createAudioTrack() method of VideoSDK class.

• This method can be used to create audio track using different noise configurations.

Example

Swift

guard let audioMediaTrack = try? VideoSDK.createAudioTrack(
        noiseConfig: noiseConfig(
            // It is used to improve the quality of audio by removing background noise
            // that can interfere with the clarity of speech.
            noiseSupression: true, 

            // It is used to remove unwanted echoes from voice.
            echoCancellation: true, 

            // It is used to maintain a consistent level of loudness or amplitude in a voice.
            autoGainControl: true, 

            // It removes low frequency sounds hence making the audio clearer.
            highPassFilter: true
    )
) else {return}

How to Setup Custom Audio Track ?

The custom track can be set up both before and after the initialization of the meeting.

1. Setting up a Custom Track during the initialization of a meeting
2. Setting up a Custom Track with methods

1. Setting up a Custom Track during the initialization of a meeting

If you are passing micEnabled: true in the initMeeting of VideoSDK and want to use custom tracks from start of the meeting, you can pass custom track in the initMeeting as shown below.

caution

Custom Track will not apply on micEnabled: false configuration.

Example

Swift

guard let customAudioStream = try? VideoSDK.createAudioTrack(
        noiseConfig: noiseConfig(
            noiseSupression: true, 
            echoCancellation: true, 
            autoGainControl: true, 
            highPassFilter: true
    )
) else {return}

let meeting = VideoSDK.initMeeting(
      meetingId: meetingId,
      participantName: name,
      micEnabled: true, // when passed true, it creates an audio track with defined configs
      webcamEnabled: cameraEnabled // optional, default: true

      // Pass the custom audio track here which will be used to when mic is auto started
      customAudioStream: customAudioStream
)

2. Setting up a Custom Track with methods

In order to switch tracks during the meeting, you have to pass the customAudioStream in the unmuteMic() method of Meeting.

tip

Make sure to call muteMic() before you create a new track as it may lead to unexpected behavior.

Example

Swift

@IBAction func unmuteButtonTapped(_ sender: Any) {
  if !on {
    guard
      let audioMediaTrack = try? VideoSDK.createAudioTrack(
        noiseConfig: noiseConfig(
            noiseSupression: true,
            echoCancellation: true,
            autoGainControl: true,
            highPassFilter: true
        )
      )
    else { return }

    self.meeting?.unmuteMic(customAudioStream: audioMediaTrack)
  } else {
    self.meeting?.muteMic()
  }
}

API Reference

The API references for all the methods and events utilised in this guide are provided below.

• Custom Audio Track