Can getUserMedia return multiple mediastreams?

now there is navigator.getUserMedia() function for html5
But JavaScript can only return 1 stream returned by getUserMedia can capture
the stream by successCallback.

For example:
getUserMedia({video:true},successCallback,errorCallback)
function successCallback(stream)
{
  video.src = URL.createObjectURL(stream)
}

Now when we develop some face detection feature using html5, we have 2 or more
camera connect to browser, but only by browser UI can we choose which one camera
can we use. We can not let JS to choose which camera can use, or use all the cameras
at the same time to manipulate the camera chosen for face detection.

So, can we in future media capture draft let getUserMedia return references for all available
cameras connect to browser in a array, so we can iterate streams and let JS to
choose the one we want for later processing, Or in some 3D scenario, to
manipulate multiple streams from cameras to show some 3D scene. for example a
better quality camera for face detection.

And streams Array returned by getUserMedia can contain quality information （1
standard for 1 mega-pixel, 5 standard for mega-pixel ）or optionally the
description of the camera, so JS can choose by filtering or comparision.

For example:
getUserMedia({video:true},successCallback,errorCallback)
function successCallback(MediaStreamList or MediaStream[] type etc)
{
while(i<MediStreamList.length）
{
if MediaStreamList(i).quality>5
video.src=url.createObjectURL(MediaStreamList(i))
break;
......
}
}

Thanks a lot
Expecting for feedback.



________________________________
孙扬
华为技术有限公司 Huawei Technologies Co., Ltd.
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