WebRTC getUserMedia promise api support in Chrome

问题

Does chrome support promise based APIs for WebRTC? I am not able to get the getUserMedia() promised based API working in Chrome.

<!DOCTYPE html>
<html>
    <head>
        <title> Mitel WebRTC client </title>
        <script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>
        <script src='dist/webrtc.min.js'></script>

        <script type="text/javascript">
            function startUp() {

                var options = {
                    audio: true,
                    video: true
                };
                if (getUserMedia) {
                    getUserMedia(options)
                    .then(function (stream) {
                        console.log("Acquired audio and video!");
                    })
                    .catch(function (err) {
                        console.log(err.name + ": " + err.message);
                    });
                } else {
                    alert("WebRTC not supported on this browser");
                }
            }
        </script>
    </head>

    <body onload="startUp();">
        <h1>WebRTC Promise API Client Application</h1>
    </body>
</html>

On the console, I see the following error

This appears to be Chrome
adapter-latest.js:32 chrome: {"audio":true,"video":true}
adapter-latest.js:410 Uncaught TypeError: Failed to execute 'webkitGetUserMedia' on 'Navigator': The callback provided as parameter 2 is not a function.

I want to make use of promise based API. Am I missing something?

回答1:

It is not implemented yet in Chrome, but it works there if you use the official adapter.js WebRTC polyfill: https://jsfiddle.net/srn9db4h/

var constraints = { video: true, audio: true };

navigator.mediaDevices.getUserMedia(constraints)
  .then(stream => video.srcObject = stream)
  .catch(e => console.error(e));

Firefox and Edge support it natively FWIW.

Update: Chrome (50) appears to support this now. And Chrome 52 even supports srcObject.

回答2:

To access navigator.mediaDevices you must to connect your site with HTTPS connection. There are no access this feature with HTTP.

https://developers.google.com/web/fundamentals/media/capturing-images/

Warning: Direct access to the camera is a powerful feature. It requires consent from the user, and your site MUST be on a secure origin (HTTPS).

来源：https://stackoverflow.com/questions/34199436/webrtc-getusermedia-promise-api-support-in-chrome

标签

google-chrome

webrtc

getusermedia