Define mute/unmute extensions

[murillo128]

Define an extension to mute/unmute video and/or audio on the media server side.

[Sean-Der]

@murillo128 Ok to define the requirements/notes here?

• Pause/Play media on the server side.
• Congestion Control Hints
  • Even if I support higher bitrate send me the lowest simulcast layer. Useful if WHIP is using Simulcast, but you are rendering the video in a small container.

---

WHEP servers may announce a optional extension that allows users to control the media on the server.

   Link: <https://whep.ietf.org/publications/213786HF/controls>;
         rel="urn:ietf:params:whep:core:playback-controls"

The returned resource accepts a POST with a JSON body. The following operations are understood today.

• Pause pauses the requested media. The value is the mids that is to be paused - { "pause": ["2"]}
• Play starts playback of the requested media. The value is the mids that is to be started - { "play": ["2"]}