如何使getUserMedia()适用于所有浏览器

小提琴

navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;

var constraints = {audio: false, video: true};
var video = document.querySelector("video");

function successCallback(stream) {
  window.stream = stream; // stream available to console
  if (window.URL) {
    video.src = window.URL.createObjectURL(stream);
  } else {
    video.src = stream;
  }
}

function errorCallback(error){
  console.log("navigator.getUserMedia error: ", error);
}

navigator.getUserMedia(constraints, successCallback, errorCallback);

问题不仅仅是前缀函数名称; 提供的流在不同浏览器中的工作方式不同 在这里,我将引导您完成它.

我假设你已经在变量中设置了一个视频元素video.

//I don't usually like to overwrite publicly accessible variables, but that's just me
var getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
var cameraStream;

getUserMedia.call(navigator, {
    video: true,
    audio: true //optional
}, function (stream) {
    /*
    Here's where you handle the stream differently. Chrome needs to convert the stream
    to an object URL, but Firefox's stream already is one.
    */
    if (window.webkitURL) {
        video.src = window.webkitURL.createObjectURL(stream);
    } else {
        video.src = stream;
    }

    //save it for later
    cameraStream = stream;

    video.play();
});

这应该涵盖Firefox,Chrome和Opera.IE和Safari尚不支持它.

另一个可能令人讨厌的事情是如果要在离开网页之前停止使用相机,请关闭相机.使用此功能:

function stopWebCam() {
    if (video) {
        video.pause();
        video.src = '';
        video.load();
    }

    if (cameraStream && cameraStream.stop) {
        cameraStream.stop();
    }
    stream = null;
}

由于Safari 11已经推出,因此无处不在(在最近版本的Chrome,Firefox和Safari 11上测试过):

var constraints = {audio: false, video: true};
var video = document.querySelector("video");

function successCallback(stream) {
  video.srcObject = stream;
  video.play();
}

function errorCallback(error) {
  console.log("navigator.getUserMedia error: ", error);
}

navigator.mediaDevices.getUserMedia(constraints)
  .then(successCallback)
  .catch(errorCallback);