webrtc,人脸拍照小功能

来源：互联网发布：seo招聘编辑：程序博客网时间：2024/05/01 12:39

<!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>
<script>
        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")
    }
</script>

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