====== changeMedia() ======
wrtc.changeMedia() changes local media sources (camera and microphone to be used). Used eg in mobile phones to switch between back and front camera. Identical duplicate of [[ixnx:wrtc:js:api:wrtc:setcapturedevice|wrtc.setCaptureDevice()]].

wrtc.changeMedia() is also used to get access to camera and microphone outside of calls.

To change microphone set [[ixnx:wrtc:js:api:wrtc:audiosource|wrtc.audioSource]] to the unique ID of the microphone to use before calling wrtc.changeMedia().

To change camera either set [[ixnx:wrtc:js:api:wrtc:videosource|wrtc.videoSource]] to the unique ID of the camera to use before calling wrtc.changeMedia() or supply the unique camera ID as argument to wrtc.changeMedia().

To get list of available microphones and cameras use [[ixnx:wrtc:js:api:wrtc:get|wrtc.get("audioSources")]] and [[ixnx:wrtc:js:api:wrtc:get|wrtc.get("videoSources")]], respectively.

To start screen sharing use [[ixnx:wrtc:js:api:wrtc:getscreen|wrtc.getScreen()]] instead.

===== Arguments =====
videoSource - (optional):
  * string containing unique camera ID to use
  * 0 if system's default camera is to be used
  * "user" - forward facing "selfie" camera on mobile phones
  * "environment" - back side main camera on mobile phones
  * null to turn off local camera
  * (advanced) JSON structure containing complete [[https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints|mediaConstraints]]
If argument is missing value of [[ixnx:wrtc:js:api:wrtc:videosource|wrtc.videoSource]] will be used. \\
If argument was supplied value of [[ixnx:wrtc:js:api:wrtc:videosource|wrtc.videoSource]] will be set to that value.
===== Returns =====
Nothing.

===== Events =====
[[ixnx:wrtc:js:api:wrtc:onlocalmedia|wrtc.onLocalMedia()]]

===== See also =====
[[ixnx:wrtc:js:api:wrtc:setcapturedevice|wrtc.setCaptureDevice()]]