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在chrome中,调用本地摄像头

时间:2018-11-15 17:06:17      阅读:423      评论:0      收藏:0      [点我收藏+]

标签:htm   rom   set   new   ref   回调函数   row   track   格式   

原文地址:https://blog.csdn.net/journey191/article/details/40744015

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>HTML5 GetUserMedia Demo</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
</head>
<body>
    <input type="button" title="开启摄像头" value="开启摄像头" onclick="getMedia();" /><br />
    <video height="120px" autoplay="autoplay"></video><hr />
    <input type="button" title="拍照" value="拍照" onclick="getPhoto();" /><br />
    <canvas id="canvas1" height="120px" ></canvas><hr />
    <input type="button" title="视频" value="视频" onclick="getVedio();" /><br />
    <canvas id="canvas2" height="120px"></canvas>
 
    <script type="text/javascript">
        var video = document.querySelector(video);
        var audio, audioType;
 
        var canvas1 = document.getElementById(canvas1);
        var context1 = canvas1.getContext(2d);
 
        var canvas2 = document.getElementById(canvas2);
        var context2 = canvas2.getContext(2d);
 
        navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
        window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
 
        var exArray = []; //存储设备源ID
        MediaStreamTrack.getSources(function (sourceInfos) {
            for (var i = 0; i != sourceInfos.length; ++i) {
                var sourceInfo = sourceInfos[i];
                //这里会遍历audio,video,所以要加以区分
                if (sourceInfo.kind === video) {
                    exArray.push(sourceInfo.id);
                }
            }
        });
 
        function getMedia() {
            if (navigator.getUserMedia) {
                navigator.getUserMedia({
                    video: {
                        optional: [{
                            sourceId: exArray[1] //0为前置摄像头,1为后置
                        }]
                    },
                    audio:true
                }, successFunc, errorFunc);    //success是获取成功的回调函数
            }
            else {
                alert(Native device media streaming (getUserMedia) not supported in this browser.);
            }
        }
 
        function successFunc(stream) {
            //alert(‘Succeed to get media!‘);
            if (video.mozSrcObject !== undefined) {
                //Firefox中,video.mozSrcObject最初为null,而不是未定义的,我们可以靠这个来检测Firefox的支持
                video.mozSrcObject = stream;
            }
            else {
                video.src = window.URL && window.URL.createObjectURL(stream) || stream;
            }
 
            //video.play();
 
            // 音频
            audio = new Audio();
            audioType = getAudioType(audio);
            if (audioType) {
                audio.src = polaroid. + audioType;
                audio.play();
            }
        }
        function errorFunc(e) {
            alert(Error!+e);
        }
 
        
        // 将视频帧绘制到Canvas对象上,Canvas每60ms切换帧,形成肉眼视频效果
        function drawVideoAtCanvas(video,context) {
            window.setInterval(function () {
                context.drawImage(video, 0, 0,90,120);
            }, 60);
        }
 
        //获取音频格式
        function getAudioType(element) {
            if (element.canPlayType) {
                if (element.canPlayType(audio/mp4; codecs="mp4a.40.5") !== ‘‘) {
                    return (aac);
                } else if (element.canPlayType(audio/ogg; codecs="vorbis") !== ‘‘) {
                    return ("ogg");
                }
            }
            return false;
        }
 
        // vedio播放时触发,绘制vedio帧图像到canvas
//        video.addEventListener(‘play‘, function () {
//            drawVideoAtCanvas(video, context2);
//        }, false);
 
        //拍照
        function getPhoto() {
            context1.drawImage(video, 0, 0,90,120); //将video对象内指定的区域捕捉绘制到画布上指定的区域,实现拍照。
        }
 
        //视频
        function getVedio() {
            drawVideoAtCanvas(video, context2);
        }
 
    </script>
</body>
</html>
在chrome中调用本地摄像头

 

在chrome中,调用本地摄像头

标签:htm   rom   set   new   ref   回调函数   row   track   格式   

原文地址:https://www.cnblogs.com/vichin/p/9964314.html

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