SubscribeSetVolume

Subscribe Volume Test

R5AudioController.setPlaybackGain: can be used to adjust the playback volume of a stream. The range is from 0.0 to 1.0.

Example Code

• BaseTest.swift
• SubscribeSetVolumeTest.swift

Running the example

1. Begin by publishing to stream1 from a second device. stream1 is the default stream1 name that is used by this example.
2. Use the slider UI to adjust the playback volume of the stream.

Using setPlaybackGain

R5AudioController.setPlaybackGain: takes a value from 0.0 to 1.0. In this example, the value is changed based on the user input from the slider control.

let f = self.view.frame
slider = UISlider(frame: CGRect(x:40, y:f.size.height - 40, width:f.size.width - 80, height:20))
slider?.minimumValue = 0
slider?.maximumValue = 100
slider?.isContinuous = true
slider?.tintColor = UIColor.blue
slider?.value = 100
slider?.addTarget(self, action: #selector(sliderValueDidChange(sender:)), for: .valueChanged)
self.view.addSubview(slider!)

@objc func sliderValueDidChange(sender:UISlider!) {
  self.subscribeStream?.audioController.volume = slider!.value / 100
}

SubscribeSetVolumeTest.swift #32

Note

The volume button mute is locked down by Apple.

The only solution found for this has been either using the "ambient" playback category - which doesn't allow recording - or switching from AVAudioSessionCategoryPlayback category to AVAudioSessionCategoryPlayAndRecord within the same session, which messes with AEC (echo cancellation).