Re: [rtcweb] determining mic/webcam availability on page load

On 09/22/2013 08:16 PM, Daniel Pocock wrote:
>
>
> Hi,
>
> I'm not sure if this has been discussed before, but I think it would be
> very useful for some applications to determine what hardware is
> available very early, well before trying to do things like SIP
> registration or making a call.
>
> However, if I use the code below, the result is that the user is
> prompted twice for permissions, once during the initial hardware
> detection and later when they try to make or receive a call.

This is an API issue, so it should go to public-webrtc@w3.org

But it's a solved issue in the spec, even though the implementations may 
be lagging: Use the getSourceInfos call to probe, not the getUserMedia call.

http://dev.w3.org/2011/webrtc/editor/getusermedia.html#methods-1
>
> Regards,
>
> Daniel
>
>
>
> navigator.webkitGetUserMedia(
>
>   {audio: true, video: true},
>
>    function (stream) {
>            var has_audio = false;
>            var has_video = false;
> 	  if(stream.getAudioTracks().length > 0)
> 		  has_audio = true;
> 	  if(stream.getVideoTracks().length > 0)
> 		  has_video = true;
> 	  console.log("closing unused stream");
> 	  stream.stop();
> 	  delete stream;
>            checksDone(has_audio, has_video);
>    },
>
>    function(err) {
> 	  console.log(err.name + ": " + err.message);
>            checksDone(false, false);
>    }
>
> );
>
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