Question

如何使用html5或javascript在桌面计算机上使用Safari浏览器打开网络摄像头？似乎javascript上的navigator.getUserMedia（）无法在Safari上运行。我找到了像WebRTC项目的库，但是不支持Safari浏览器。任何帮助。

Answer 1

新浏览器不推荐使用

navigator.getUserMedia()。尝试这样使用：

navigator.mediaDevices.getUserMedia

这是我的整个代码

<script>
// Older browsers might not implement mediaDevices at all, so we set an empty object first
 var video = document.querySelector('video');
  var canvas = document.querySelector('canvas');
  var ctx = canvas.getContext('2d');
  var image = document.querySelector('img');
if (navigator.mediaDevices === undefined) {
  navigator.mediaDevices = {};
}

// Some browsers partially implement mediaDevices. We can't just assign an object
// with getUserMedia as it would overwrite existing properties.
// Here, we will just add the getUserMedia property if it's missing.
if (navigator.mediaDevices.getUserMedia === undefined) {
  navigator.mediaDevices.getUserMedia = function(constraints) {

    // First get ahold of the legacy getUserMedia, if present
    var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;

    // Some browsers just don't implement it - return a rejected promise with an error
    // to keep a consistent interface
    if (!getUserMedia) {
      return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
    }

    // Otherwise, wrap the call to the old navigator.getUserMedia with a Promise
    return new Promise(function(resolve, reject) {
      getUserMedia.call(navigator, constraints, resolve, reject);
    });
  }
}
function snapshot() {
      var cw = video.clientWidth;
      var ch = video.clientHeight;
      ctx.drawImage(video, 0, 0, cw, ch, 0, 0, cw / 2, ch / 3);
      image.src = canvas.toDataURL();
      image.height = ch;
      image.width = cw;
  }

  video.addEventListener('click', snapshot, false);
navigator.mediaDevices.getUserMedia({ audio: false, video: true })
.then(function(stream) {
  var video = document.querySelector('video');
  // Older browsers may not have srcObject
 // if ("srcObject" in video) {
    video.srcObject = stream;
 // } else {
    // Avoid using this in new browsers, as it is going away.
    //video.src = window.URL.createObjectURL(stream);
 // }
  video.onloadedmetadata = function(e) {
    video.play();
  };
})
.catch(function(err) {
  console.log(err.name + ": " + err.message);
});
</script>

Safari浏览器支持Safari浏览器

1 个答案: