我有一个使用AngularJS的SPA版本。 登录我将Streaming Object保存在一个全局变量中供将来使用(所以我必须只设置一次权限) 我在两个用户处使用此StreamingObject(暂时) 故事一: 更改个人资料图片 故事二进行自拍并发布。 一切正常,直到我从故事一切换到故事二。 这打破了流。
我写了这个指令。
angular.module('myApp')
.controller('webcamCtrl', function ($scope, globVal) {
var width = 373;
var height = 0;
var streaming = false;
var video = null;
var canvas = null;
$scope.showPicture = false;
$scope.startup = function() {
video = document.getElementById('video');
canvas = document.getElementById('canvas');
$scope.$watch(function () {
return globVal.webcam;
}, function() {
if(globVal.webcam !== null){
video.src = globVal.webcam;
video.play();
}
});
video.addEventListener('canplay', function () {
if (!streaming) {
height = video.videoHeight / (video.videoWidth / width);
if (isNaN(height)) {
height = width / (4 / 3);
}
video.setAttribute('width', width);
video.setAttribute('height', height);
canvas.setAttribute('width', width);
canvas.setAttribute('height', height);
streaming = true;
}
}, false);
$scope.clearphoto();
};
$scope.clearphoto = function() {
var context = canvas.getContext('2d');
context.fillStyle = '#AAA';
context.fillRect(0, 0, canvas.width, canvas.height);
$scope.showPicture = false;
globVal.image = null;
};
$scope.takepicture = function() {
var context = canvas.getContext('2d');
if(!$scope.showPicture){
if (width && height) {
canvas.width = width;
canvas.height = height;
context.drawImage(video, 0, 0, width, height);
$scope.showPicture = true;
$scope.acceptpicture();
} else {
$scope.clearphoto();
}
}else {
$scope.clearphoto();
}
};
$scope.acceptpicture = function() {
if($scope.showPicture){
var data = canvas.toDataURL('image/png');
globVal.image = data;
}else{
globVal.image = null;
}
};
$scope.startup();
});
任何提示?
答案 0 :(得分:0)
解决。我添加了一个ng-if到我的指令,所以teh网络摄像头的范围可以安全地销毁
<web-cam ng-if="showCam"></web-cam