- <!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="開啟攝像頭" value="開啟攝像頭" 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="視頻" value="視頻" 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 = []; //存儲設備源ID
- MediaStreamTrack.getSources(function (sourceInfos) {
- for (var i = 0; i != sourceInfos.length; ++i) {
- var sourceInfo = sourceInfos[i];
- //這里會遍歷audio,video,所以要加以區分
- if (sourceInfo.kind === 'video') {
- exArray.push(sourceInfo.id);
- }
- }
- });
- function getMedia() {
- if (navigator.getUserMedia) {
- navigator.getUserMedia({
- 'video': {
- 'optional': [{
- 'sourceId': exArray[1] //0為前置攝像頭,1為后置
- }]
- },
- 'audio':true
- }, successFunc, errorFunc); //success是獲取成功的回調函數
- }
- 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最初為null,而不是未定義的,我們可以靠這個來檢測Firefox的支持
- video.mozSrcObject = stream;
- }
- else {
- video.src = window.URL && window.URL.createObjectURL(stream) || stream;
- }
- //video.play();
- // 音頻
- audio = new Audio();
- audioType = getAudioType(audio);
- if (audioType) {
- audio.src = 'polaroid.' + audioType;
- audio.play();
- }
- }
- function errorFunc(e) {
- alert('Error!'+e);
- }
- // 將視頻幀繪制到Canvas對象上,Canvas每60ms切換幀,形成肉眼視頻效果
- function drawVideoAtCanvas(video,context) {
- window.setInterval(function () {
- context.drawImage(video, 0, 0,90,120);
- }, 60);
- }
- //獲取音頻格式
- 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播放時觸發,繪制vedio幀圖像到canvas
- // video.addEventListener('play', function () {
- // drawVideoAtCanvas(video, context2);
- // }, false);
- //拍照
- function getPhoto() {
- context1.drawImage(video, 0, 0,90,120); //將video對象內指定的區域捕捉繪制到畫布上指定的區域,實現拍照。
- }
- //視頻
- function getVedio() {
- drawVideoAtCanvas(video, context2);
- }
- </script>
- </body>
- </html>