js获取摄像头视频流
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | <! DOCTYPE html> < html > < head > < meta charset="utf-8"> < title ></ title > </ head > < body > < video id="video" width="640" height="480" autoplay></ video > < button id="snap">Snap Photo</ button > < canvas id="canvas" width="640" height="480"></ canvas > < h2 >按钮模拟拍照</ h2 > </ body > < script type="text/javascript"> var aVideo = document.getElementById('video'); var aCanvas = document.getElementById('canvas'); var ctx = aCanvas.getContext('2d'); navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia; //获取媒体对象(这里指摄像头) navigator.getUserMedia({ video: true }, gotStream, noStream); //参数1获取用户打开权限;参数二成功打开后调用,并传一个视频流对象,参数三打开失败后调用,传错误信息 function gotStream(stream) { video.src = URL.createObjectURL(stream); video.onerror = function() { stream.stop(); }; stream.onended = noStream; video.onloadedmetadata = function() { alert('摄像头成功打开!'); }; } function noStream(err) { alert(err); } document.getElementById("snap").addEventListener("click", function() { ctx.drawImage(aVideo, 0, 0, 640, 480); //将获取视频绘制在画布上 }); </ script > </ html > |
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