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webrtc,人脸拍照小功能

2017-01-04 15:28 183 查看 
<!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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