js和HTML5基于过滤器从摄像头中捕获视频的方法

本文实例讲述了js+HTML5基于过滤器从摄像头中捕获视频的方法。分享给大家供大家参考。具体如下：

index.html页面：

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style.css文件：
.grayscale{ -webkit-filter:grayscale(1); -moz-filter:grayscale(1); -o-filter:grayscale(1); -ms-filter:grayscale(1); filter:grayscale(1);.sepia{ -webkit-filter:sepia(0.8); -moz-filter:sepia(0.8); -o-filter:sepia(0.8); -ms-filter:sepia(0.8); filter:sepia(0.8);.blur{ -webkit-filter:blur(3px); -moz-filter:blur(3px); -o-filter:blur(3px); -ms-filter:blur(3px); filter:blur(3px);.brightness{ -webkit-filter:brightness(0.3); -moz-filter:brightness(0.3); -o-filter:brightness(0.3); -ms-filter:brightness(0.3); filter:brightness(0.3);.contrast{ -webkit-filter:contrast(0.5); -moz-filter:contrast(0.5); -o-filter:contrast(0.5); -ms-filter:contrast(0.5); filter:contrast(0.5);.hue-rotate{ -webkit-filter:hue-rotate(90deg); -moz-filter:hue-rotate(90deg); -o-filter:hue-rotate(90deg); -ms-filter:hue-rotate(90deg); filter:hue-rotate(90deg);.hue-rotate2{ -webkit-filter:hue-rotate(180deg); -moz-filter:hue-rotate(180deg); -o-filter:hue-rotate(180deg); -ms-filter:hue-rotate(180deg); filter:hue-rotate(180deg);.hue-rotate3{ -webkit-filter:hue-rotate(270deg); -moz-filter:hue-rotate(270deg); -o-filter:hue-rotate(270deg); -ms-filter:hue-rotate(270deg); filter:hue-rotate(270deg);.saturate{ -webkit-filter:saturate(10); -moz-filter:saturate(10); -o-filter:saturate(10); -ms-filter:saturate(10); filter:saturate(10);.invert{ -webkit-filter:invert(1); -moz-filter:invert(1); -o-filter: invert(1); -ms-filter: invert(1); filter: invert(1);}
script.js 文件：
// Main initializationdocument.addEventListener( DOMContentLoaded , function() { // Global variables var video = document.querySelector( video  var audio, audioType; var canvas = document.querySelector( canvas  var context = canvas.getContext( 2d  // Custom video filters var iFilter = 0; var filters = [ grayscale , sepia , blur , brightness , contrast , hue-rotate , hue-rotate2 , hue-rotate3 , saturate , invert , none  // Get the video stream from the camera with getUserMedia navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia; window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL; if (navigator.getUserMedia) { // Evoke getUserMedia function navigator.getUserMedia({video: true, audio: true}, onSuccessCallback, onErrorCallback); function onSuccessCallback(stream) { // Use the stream from the camera as the source of the video element video.src = window.URL.createObjectURL(stream) || stream; // Autoplay video.play(); // HTML5 Audio audio = new Audio(); audioType = getAudioType(audio); if (audioType) { audio.src = polaroid. + audioType; audio.play(); // Display an error function onErrorCallback(e) { var expl = An error occurred: [Reason: + e.code + ]  console.error(expl); alert(expl); return; } else { document.querySelector( .container ).style.visibility = hidden  document.querySelector( .warning ).style.visibility = visible  return; // Draw the video stream at the canvas object function drawVideoAtCanvas(obj, context) { window.setInterval(function() { context.drawImage(obj, 0, 0); }, 60); // The canPlayType() function doesn t return true or false. In recognition of how complex // formats are, the function returns a string: probably , maybe or an empty string. 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; // Add event listener for our video s Play function in order to produce video at the canvas video.addEventListener( play , function() { drawVideoAtCanvas(this, context); }, false); // Add event listener for our Button (to switch video filters) document.querySelector( button ).addEventListener( click , function() { video.className =  canvas.className =  var effect = filters[iFilter++ % filters.length]; // Loop through the filters. if (effect) { video.classList.add(effect); canvas.classList.add(effect); document.querySelector( .container h3 ).innerHTML = Current filter is: + effect; }, false);}, false);
以上就是本文的全部内容，希望对大家的学习有所帮助，更多相关内容请关注PHP ！
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以上就是js和HTML5基于过滤器从摄像头中捕获视频的方法的详细内容，其它编程语言        
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