- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>学习webrtc-chapter2:get user media</title>
- <style>
- video,canvas{
- border:1px solid gray;
- width:400px;
- height:400px;
- border-radius:50%;
- }
- </style>
- </head>
- <body>
- <video autoplay></video>
- <canvas id="myCanvas"></canvas>
- <button id="capture">拍照</button>
- <script src="photobooth.js"></script>
- </body>
- </html>
- function hasUserMedia(){//判断是否支持调用设备api，因为浏览器不同所以判断方式不同哦
- return !!(navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia);
- }
- if(hasUserMedia()){
- //alert(navigator.mozGetUserMedia)
- navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
- var video=document.querySelector("video");
- var canvas=document.querySelector("canvas");
- var streaming = false;
- navigator.getUserMedia({
- video:true,//开启视频
- audio:false//先关闭音频，因为会有回响，以后两台电脑通信不会有响声
- },function(stream){//将视频流交给video
- video.src=window.URL.createObjectURL(stream);
- streaming = true;
- },function(err){
- console.log("capturing",err)
- });
- document.querySelector("#capture").addEventListener("click",function(event){
- if(streaming){
- //alert(video.clientHeight)
- //canvas.width = video.clientWidth;
- //canvas.height= video.clientHeight;
- canvas.width = 800;
- canvas.height = 800;
- var context = canvas.getContext('2d');
- context.drawImage(video,20,20)
- }
- })
- }else{
- alert("浏览器暂不支持")
- }
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