在非ios系統實測可以運行。關鍵API:navigator.getUserMedia;測試ios系統,微信及瀏覽器, 有趣的是navigator有getUserMedia這個屬性,但值爲均爲undefined。猜想可能是因爲:webTRTC安全問題:2015年,TorrentFreak報告了一個WebRTC的安全漏洞,該漏洞會致使安裝有WebRTC的用戶泄露真實IP,即使用戶已經使用虛擬私人網路。https://baike.baidu.com/item/WebRTC/5522744?fr=aladdin。 ios給禁用了。具體原因不詳。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input type="button" title="開啓攝像頭" value="開啓攝像頭" onclick="getMedia();"/><br/>
<video height="400px" autoplay="autoplay" style='border: 1px solid #f00;'></video>
<hr/>
<input type="button" title="拍照" value="拍照" onclick="getPhoto();"/><br/>
<canvas id="canvas1" height="400px" style='border: 1px solid #f00;'></canvas>
<hr/>
<input type="button" title="視頻" value="視頻" onclick="getVedio();"/><br/>
<canvas id="canvas2" height="400px" style='border: 1px solid #f00;'></canvas>
<script type="text/javascript">
var videoHeight;
var videoWidth;
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
try {
MediaStreamTrack.getSources(function (sourceInfos) {
for (var i = 0; i != sourceInfos.length; ++i) {
var sourceInfo = sourceInfos[i];
//這裏會遍歷audio,video,所以要加以區分
if (sourceInfo.kind === 'video') {
exArray.push(sourceInfo.id);
}
}
});
} catch (e) {
console.log(e)
}
function getMedia() {
if (navigator.getUserMedia) {
navigator.getUserMedia({
'video': {
'optional': [{
'sourceId': exArray[0] //0爲前置攝像頭,1爲後置
}]
},
'audio': true
}, successFunc, errorFunc); //success是獲取成功的回調函數
} else {
/**
* 測試ios手機及筆記本,微信及瀏覽器, 有趣的是navigator有getUserMedia這個屬性,但值爲均爲undefined
*時間 20191120
*
* */
alert('Native device media streaming (getUserMedia) not supported in this browser.');
}
}
function successFunc(stream) {
//alert('Succeed to get media!');
console.log(stream);
if (video.mozSrcObject !== undefined) {
//Firefox中,video.mozSrcObject最初爲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 {
try {
video.src = window.URL && window.URL.createObjectURL(stream) || stream;
} catch (e) {
/**
* 之前工作的網頁調用攝像頭獲取視頻並拍照的作品報錯:
Failed to execute 'createObjectURL' on 'URL'
原因是Chrome升級後,新版本的Chrome不再支持該用法。
其他主流瀏覽器也是如此,詳細討論請參考如下鏈接:
https://www.fxsitecompat.com/en-CA/docs/2017/url-createobjecturl-stream-has-been-deprecated/
* */
try {
video.srcObject = stream;
} catch (error) {
console.log(error)
}
}
}
//video.play();
// 音頻
audio = new Audio();
audioType = getAudioType(audio);
if (audioType) {
audio.src = 'polaroid.' + audioType;
audio.play();
}
video.onplay=function (ev) {
videoHeight=video.videoHeight;
videoWidth=video.videoWidth;
console.log(videoHeight)
console.log(videoWidth)
canvas1.width=videoWidth;
canvas1.height=videoHeight;
canvas2.width=videoWidth;
canvas2.height=videoHeight;
}
}
function errorFunc(e) {
alert('Error!' + e);
}
var img = new Image();
img.src = "./imgs/shabi.png";
img.onload = function (ev) {
context1.drawImage(img, 0, 0);
context2.drawImage(img, 0, 0);
}
// 將視頻幀繪製到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);
context.drawImage(img, 0, 0);
}, 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,繪製vedio幀圖像到canvas
// video.addEventListener('play', function () {
// drawVideoAtCanvas(video, context2);
// }, false);
//拍照
function getPhoto() {
context1.drawImage(video, 0, 0); //將video對象內指定的區域捕捉繪製到畫布上指定的區域,實現拍照。
context1.drawImage(img, 0, 0);
}
//視頻
function getVedio() {
drawVideoAtCanvas(video, context2);
}
</script>
</body>
</html>
效果:
這是用pc端瀏覽器測試的。
安卓手機也測試可以!