[Webkit-unassigned] [Bug 174327] New: Adding, removing, and then adding back same MediaStreamTrack throws InvalidAccessError

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174327

            Bug ID: 174327
           Summary: Adding, removing, and then adding back same
                    MediaStreamTrack throws InvalidAccessError
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mroberts at twilio.com

It should be possible to add a MediaStreamTrack, remove it, and then add it back to an RTCPeerConnection. See the following code:

    (async () => {
      const stream = await navigator.mediaDevices.getUserMedia({ audio: true })
      const [track] = stream.getTracks()

      const pc = new RTCPeerConnection()

      console.log('1. addTrack(track, stream)')
      const sender = pc.addTrack(track, stream)

      console.log('2. removeTrack(sender)')
      pc.removeTrack(sender)
      if (sender.track !== null) {
        console.error('The RTCRtpSender\'s track should be set to null')
      }

      console.log('3. addTrack(track, stream)')
      pc.addTrack(track, stream)

      console.log('Success!')
    })()

Expected output:

    1. addTrack(track, stream) 
    2. removeTrack(sender) 
    3. addTrack(track, stream) 
    Success!

Actual output (Safari):

    1. addTrack(track, stream) 
    2. removeTrack(sender) 
    The RTCRtpSender's track should be set to null
    3. addTrack(track, stream) 
    Unhandled Promise Rejection: InvalidAccessError (DOM Exception 15): The object does not support the operation or argument.

(Note: In Firefox, I mostly get the expected output, except I also get the "The RTCRtpSender's track should be set to null" error.)

FWIW, I tried to workaround this by calling `sender.replaceTrack` in Step 3 instead of `sender.addTrack`. Although the code prints "Success!" in that case, I later get "Unhandled Promise Rejection: InvalidStateError (DOM Exception 11): The object is in an invalid state."

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