html调用摄像头实现拍照或录制视频
从网上搜刮了两个可以实现的demo，记录一下。
- 示例1
Document
>
/* 镜像显示哈哈 */
#gumVideo {
transform: rotateY(180deg);
}
>
var beginButton = document.querySelector('button#begin');
var recordButton = document.querySelector('button#record');
var playButton = document.querySelector('button#play');
var downloadButton = document.querySelector('button#download');
var reStartButton = document.querySelector('button#reStart');
var uploadBtn = document.querySelector('button#upload');
var gumVideo = document.querySelector('#gumVideo');
var gumVideo2 = document.querySelector('#gumVideo2');
var mediaRecorder;
var recordedBlobs;
var sourceBuffer;
console.log(gumVideo)
//打开摄像头
function getUserMediaStream(constraints, cb) {
navigator.mediaDevices.getUserMedia(constraints)
.then(handleSuccess)
.catch(err => { cb(err, null);
});
}
//页面播放视频流
function handleSuccess(stream) {
console.log(stream)
recordButton.disabled = false;
console.log('getUserMedia() got stream: ', stream);
window.stream = stream;
if (window.URL) {
// gumVideo.src = https://www.it610.com/article/window.URL.createObjectURL(stream);
gumVideo.srcObject = stream;
// return new Promise((resolve) => {
//gumVideo.onloadedmetadata = https://www.it610.com/article/() => {
//resolve(gumVideo);
//};
// });
// gumVideo.play()
console.log(gumVideo.srcObject)
} else {
gumVideo.src = https://www.it610.com/article/stream;
console.log(gumVideo)
}var c = document.getElementById("myCanvas");
c.width = 400;
c.height = 300;
var i;
gumVideo.addEventListener('play', function () {
var p = document.createElement('p');
p.innerText = 'hello';
// i = window.setInterval(function () {
//if (littleVideo) {
//drawLittleVideo(c);
//} else {
//drawBigVideo(c);
//}
// }, 20);
}, false);
gumVideo.addEventListener('pause', function () { if (i) { window.clearInterval(i);
} }, false);
gumVideo.addEventListener('ended', function () { if (i) { clearInterval(i);
} }, false);
}function startRecording() {
recordedBlobs = [];
var options = { mimeType: 'video/webm;
codecs=vp9' };
if (!MediaRecorder.isTypeSupported(options.mimeType)) {
console.log(options.mimeType + ' is not Supported');
options = { mimeType: 'video/webm;
codecs=vp8' };
if (!MediaRecorder.isTypeSupported(options.mimeType)) {
console.log(options.mimeType + ' is not Supported');
options = { mimeType: 'video/webm' };
if (!MediaRecorder.isTypeSupported(options.mimeType)) {
console.log(options.mimeType + ' is not Supported');
options = { mimeType: '' };
}
}
}
try {
mediaRecorder = new MediaRecorder(window.stream, options);
} catch (e) {
console.error('Exception while creating MediaRecorder: ' + e);
alert('Exception while creating MediaRecorder: '
+ e + '. mimeType: ' + options.mimeType);
return;
}
console.log('Created MediaRecorder', mediaRecorder, 'with options', options);
recordButton.textContent = '停止';
playButton.disabled = true;
downloadButton.disabled = true;
reStartButton.disabled = true;
mediaRecorder.onstop = handleStop;
mediaRecorder.ondataavailable = handleDataAvailable;
mediaRecorder.start(10);
// collect 10ms of data
console.log('MediaRecorder started', mediaRecorder);
}
function handleStop(event) {
console.log('Recorder stopped: ', event);
}
function handleDataAvailable(event) {
if (event.data && event.data.size > 0) {
recordedBlobs.push(event.data);
}
}
function toggleRecording() {
if (recordButton.textContent === '录制' || recordButton.textContent === '重录') {
// littleVideo = false;
startRecording();
setTimeout(() => {
stopRecording();
recordButton.textContent = '重录';
playButton.disabled = false;
downloadButton.disabled = false;
reStartButton.disabled = false;
}, 5000);
} else {
stopRecording();
recordButton.textContent = '重录';
playButton.disabled = false;
downloadButton.disabled = false;
reStartButton.disabled = false;
}
}
function stopRecording() {
//影藏录制中提
mediaRecorder.stop();
bufferToDataUrl()
console.log('Recorded Blobs: ', recordedBlobs);
//recordedVideo.controls = true;
}
function play() {
var superBuffer = new Blob(recordedBlobs, { type: 'video/mp4' });
//recordedVideo.src = https://www.it610.com/article/window.URL.createObjectURL(superBuffer);
gumVideo2.src = window.URL.createObjectURL(superBuffer);
gumVideo2.play()
}
function upload() {
//保存在本地，通过post请求
var blob = new Blob(recordedBlobs, { type:'video/mp4' });
// var data = https://www.it610.com/article/new FormData();
// data.append('video', blob);
// data.append('qw', 123);
// data.append('question', 1);
// $.ajax({
//type: "POST",
//url: "/form/data",
//data: data,
//processData: false,//告诉jquery不要处理发送的数据
//contentType: false,// 告诉jquery不要设置content-Type请求头
//success: function (msg) {
//console.log(msg);
//}
// });
}
//buffer转dataUrl
function bufferToDataUrl() {
let blob = new Blob(recordedBlobs, { type: "video/webm" });
let reader = new FileReader();
reader.onload = function () {
var a = document.createElement('a');
a.style.display = 'none';
a.href = https://www.it610.com/article/reader.result;
//文件名 通过方法传进来 检测是否合法？
a.download ='record.mp4';
document.body.appendChild(a);
a.click();
setTimeout(function () {
document.body.removeChild(a);
window.URL.revokeObjectURL(reader.result);
}, 100);
};
reader.readAsDataURL(blob);
}
function restartRecord() {
//清楚存留 按钮功能重置
recordButton.textContent = '录制';
playButton.disabled = true;
downloadButton.disabled = true;
reStartButton.disabled = true;
//handleSuccess();
navigator.mediaDevices.getUserMedia({ audio: true, video: { facingMode: 'user' } }).
then(handleSuccess).catch(handleError);
}
//转文件
function dataUrlToFile(dataUrl) {
let binary = atob(dataUrl.split(",")[1]);
let data = https://www.it610.com/article/[];
for (var i = 0;
i < binary.length;
i++)
data.push(binary.charCodeAt(i));
return new File([new Uint8Array(data)],"recorded-video.webm", {
type: "video/webm"
});
}
//获取屏幕流
function getDisplayMediaStream(cb) {
navigator.mediaDevices.getDisplayMedia()
.then(stream => { cb(null, stream);
})
.catch(err => { cb(err, null);
})
}
- 示例2
摄像头拍照
>
//访问用户媒体设备的兼容方法
function getUserMedia(constraints, success, error) {
if (navigator.mediaDevices.getUserMedia) {
//最新的标准API
navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
} else if (navigator.webkitGetUserMedia) {
//webkit核心浏览器
navigator.webkitGetUserMedia(constraints,success, error)
} else if (navigator.mozGetUserMedia) {
//firfox浏览器
navigator.mozGetUserMedia(constraints, success, error);
} else if (navigator.getUserMedia) {
//旧版API
navigator.getUserMedia(constraints, success, error);
}
}let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
let context = canvas.getContext('2d');
function success(stream) {
//兼容webkit核心浏览器
let CompatibleURL = window.URL || window.webkitURL;
//将视频流设置为video元素的源
console.log(stream);
//video.src = https://www.it610.com/article/CompatibleURL.createObjectURL(stream);
video.srcObject = stream;
video.play();
}function error(error) {
console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
}if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia) {
//调用用户媒体设备, 访问摄像头
getUserMedia({video : {width: 480, height: 320}}, success, error);
} else {
alert('不支持访问用户媒体');
}document.getElementById('capture').addEventListener('click', function () {
context.drawImage(video, 0, 0, 480, 320);
})
- 示例3 配合fileSaver.js
video recoder
src="https://www.it610.com/article/fileSaver.js">
>
body{
background-color:#EFEDEF;
}
class="experiment" style="width:320px;
height:240px;
border:1px solid green;
margin:50px auto;
">
class="experiment" style="text-align:center;
border:none;
margin-top:20px;
">
>
var mediaStream;
var recorderFile;
var stopRecordCallback;
var openBtn = document.getElementById("openCamera");
var startBtn = document.getElementById("start-recording");
var saveBtn = document.getElementById("save-recording");
openBtn.onclick = function() {
this.disabled = true;
startBtn.disabled=false;
openCamera();
};
startBtn.onclick = function() {
this.disabled = true;
startRecord();
};
saveBtn.onclick = function() {
saver();
// alert('Drop WebM file on Chrome or Firefox. Both can play entire file. VLC player or other players may not work.');
};
var mediaRecorder;
var videosContainer = document.getElementById('videos-container');
function openCamera(){
var len = videosContainer.childNodes.length;
for(var i=0;
i 0) {
for (let j = 0;
j < tracks.length;
j++) {
let track = tracks[j];
if (typeof track.stop === 'function') {
track.stop();
}
}
}
}
}
}
};
function startRecord() {
console.log("开始： "+new Date());
mediaRecorder.start();
setTimeout(function(){
// 结束
stopRecord(function() {
//alert("录制成功!");
openBtn.disabled=false;
saveBtn.disabled=false;
console.log("录制结束： "+new Date());
saver();
//send();
});
}, 10000);
alert(111);
}function saver(){
var file = new File([recorderFile], 'msr-' + (new Date).toISOString().replace(/:|\./g, '-') + '.mp4', {
type: 'video/mp4'
});
console.log("保存开始： "+new Date());
saveAs(file);
console.log("保存结束： "+new Date());
}function send(){
var file = new File([recorderFile], 'msr-' + (new Date).toISOString().replace(/:|\./g, '-') + '.mp4', {
type: 'video/mp4'
});
var data = https://www.it610.com/article/new FormData();
data.append("username", "test");
data.append("userfile", file);
var req = new XMLHttpRequest();
req.open("POST", "com.spinsoft.bip.frame.utils.image.saveMp4.biz.ext");
req.send(data);
} 【javascript|html调用摄像头实现拍照或录制视频】fileSaver.js
/* FileSaver.js
* A saveAs() FileSaver implementation.
* 1.3.2
* 2016-06-16 18:25:19
*
* By Eli Grey, http://eligrey.com
* License: MIT
*See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
*//*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true *//*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */var saveAs = saveAs || (function(view) {
"use strict";
// IE <10 is explicitly unsupported
if (typeof view === "undefined" || typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
return;
}
var
doc = view.document
// only get URL when necessary in case Blob.js hasn't overridden it yet
, get_URL = function() {
return view.URL || view.webkitURL || view;
}
, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
, can_use_save_link = "download" in save_link
, click = function(node) {
var event = new MouseEvent("click");
node.dispatchEvent(event);
}
, is_safari = /constructor/i.test(view.HTMLElement) || view.safari
, is_chrome_ios =/CriOS\/[\d]+/.test(navigator.userAgent)
, throw_outside = function(ex) {
(view.setImmediate || view.setTimeout)(function() {
throw ex;
}, 0);
}
, force_saveable_type = "application/octet-stream"
// the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
, arbitrary_revoke_timeout = 1000 * 40 // in ms
, revoke = function(file) {
var revoker = function() {
if (typeof file === "string") { // file is an object URL
get_URL().revokeObjectURL(file);
} else { // file is a File
file.remove();
}
};
setTimeout(revoker, arbitrary_revoke_timeout);
}
, dispatch = function(filesaver, event_types, event) {
event_types = [].concat(event_types);
var i = event_types.length;
while (i--) {
var listener = filesaver["on" + event_types[i]];
if (typeof listener === "function") {
try {
listener.call(filesaver, event || filesaver);
} catch (ex) {
throw_outside(ex);
}
}
}
}
, auto_bom = function(blob) {
// prepend BOM for UTF-8 XML and text/* types (including HTML)
// note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;
.*charset\s*=\s*utf-8/i.test(blob.type)) {
return new Blob([String.fromCharCode(0xFEFF), blob], {type: blob.type});
}
return blob;
}
, FileSaver = function(blob, name, no_auto_bom) {
if (!no_auto_bom) {
blob = auto_bom(blob);
}
// First try a.download, then web filesystem, then object URLs
var
filesaver = this
, type = blob.type
, force = type === force_saveable_type
, object_url
, dispatch_all = function() {
dispatch(filesaver, "writestart progress write writeend".split(" "));
}
// on any filesys errors revert to saving with object URLs
, fs_error = function() {
if ((is_chrome_ios || (force && is_safari)) && view.FileReader) {
// Safari doesn't allow downloading of blob urls
var reader = new FileReader();
reader.onloadend = function() {
var url = is_chrome_ios ? reader.result : reader.result.replace(/^data:[^;
]*;
/, 'data:attachment/file;
');
var popup = view.open(url, '_blank');
if(!popup) view.location.href = https://www.it610.com/article/url;
url=undefined;
// release reference before dispatching
filesaver.readyState = filesaver.DONE;
dispatch_all();
};
reader.readAsDataURL(blob);
filesaver.readyState = filesaver.INIT;
return;
}
// don't create more object URLs than needed
if (!object_url) {
object_url = get_URL().createObjectURL(blob);
}
if (force) {
view.location.href = https://www.it610.com/article/object_url;
} else {
var opened = view.open(object_url,"_blank");
if (!opened) {
// Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html
view.location.href = https://www.it610.com/article/object_url;
}
}
filesaver.readyState = filesaver.DONE;
dispatch_all();
revoke(object_url);
}
;
filesaver.readyState = filesaver.INIT;
if (can_use_save_link) {
object_url = get_URL().createObjectURL(blob);
setTimeout(function() {
save_link.href = object_url;
save_link.download = name;
click(save_link);
dispatch_all();
revoke(object_url);
filesaver.readyState = filesaver.DONE;
});
return;
}fs_error();
}
, FS_proto = FileSaver.prototype
, saveAs = function(blob, name, no_auto_bom) {
return new FileSaver(blob, name || blob.name ||"download", no_auto_bom);
}
;
// IE 10+ (native saveAs)
if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
return function(blob, name, no_auto_bom) {
name = name || blob.name || "download";
if (!no_auto_bom) {
blob = auto_bom(blob);
}
return navigator.msSaveOrOpenBlob(blob, name);
};
}FS_proto.abort = function(){};
FS_proto.readyState = FS_proto.INIT = 0;
FS_proto.WRITING = 1;
FS_proto.DONE = 2;
FS_proto.error =
FS_proto.onwritestart =
FS_proto.onprogress =
FS_proto.onwrite =
FS_proto.onabort =
FS_proto.onerror =
FS_proto.onwriteend =
null;
return saveAs;
}(
typeof self !== "undefined" && self
|| typeof window !== "undefined" && window
|| this.content
));
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the windowif (typeof module !== "undefined" && module.exports) {
module.exports.saveAs = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd !== null)) {
define("FileSaver.js", function() {
return saveAs;
});
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