Last active
August 29, 2015 13:57
-
-
Save redannick/9894637 to your computer and use it in GitHub Desktop.
getUserMedia mediastream buffer
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script type="text/javascript"> | |
| 'use strict'; | |
| (function(){ | |
| var frameStore = {}; | |
| function toggle_visibility() { | |
| function toggle(id){ | |
| var el = document.getElementById(id); | |
| el.style.display = el.style.display==='none' ? 'block' : 'none'; | |
| } | |
| for(var i=0; i<arguments.length; ++i){ | |
| toggle(arguments[i]); | |
| } | |
| } | |
| function startRecording(stream, videoElementId, canvasElementId) { | |
| frameStore[videoElementId] = []; | |
| var mediaElement = document.querySelector(videoElementId) | |
| mediaElement.src = URL.createObjectURL(stream); | |
| var canvas = document.querySelector(canvasElementId) | |
| toggle_visibility(canvasElementId.substr(1)); | |
| setTimeout(function(){toggle_visibility(canvasElementId.substr(1));}, 4000); | |
| var context = canvas.getContext('2d'); | |
| mediaElement.addEventListener('play', function(){ | |
| draw(this,context,320,180, frameStore[videoElementId]); | |
| },false); | |
| } | |
| function draw(v,c,w,h,store) { | |
| if(v.paused || v.ended) return false; | |
| c.drawImage(v,0,0); | |
| var data = c.getImageData(0, 0, w, h); | |
| store.push(data); | |
| if(store.length > 100) { | |
| c.putImageData(store[store.length-100], 0, 0); | |
| store.shift(); | |
| }; | |
| setTimeout(draw,40,v,c,w,h,store); | |
| } | |
| function init() { | |
| navigator.getMedia = ( navigator.getUserMedia || | |
| navigator.webkitGetUserMedia || | |
| navigator.mozGetUserMedia || | |
| navigator.msGetUserMedia); | |
| navigator.getMedia ( | |
| // constraints | |
| { | |
| video: { | |
| mandatory: { | |
| maxFrameRate: 25, | |
| maxWidth: 320, | |
| maxHeight: 180 | |
| } | |
| }, | |
| audio: false | |
| }, | |
| // successCallback | |
| function(localMediaStream) { | |
| startRecording(localMediaStream, "#myvideo1", "#c1"); | |
| startRecording(localMediaStream, "#myvideo2", "#c2"); | |
| startRecording(localMediaStream, "#myvideo3", "#c3"); | |
| startRecording(localMediaStream, "#myvideo4", "#c4"); | |
| startRecording(localMediaStream, "#myvideo5", "#c5"); | |
| startRecording(localMediaStream, "#myvideo6", "#c6"); | |
| startRecording(localMediaStream, "#myvideo7", "#c7"); | |
| startRecording(localMediaStream, "#myvideo8", "#c8"); | |
| startRecording(localMediaStream, "#myvideo9", "#c9"); | |
| startRecording(localMediaStream, "#myvideo0", "#c0"); | |
| }, | |
| // errorCallback | |
| function(err) { | |
| console.log("The following error occured: " + err); | |
| console.log(err); | |
| } | |
| ); | |
| } | |
| document.addEventListener('DOMContentLoaded', init); | |
| })(); | |
| </script> | |
| <style type="text/css"> | |
| .video-holder { | |
| position:relative; | |
| width:100%; | |
| } | |
| .thevideo { | |
| position:absolute; | |
| width:320px; | |
| height:180px; | |
| } | |
| .c { | |
| /*position:absolute;*/ | |
| top: 0; | |
| bottom: 0; | |
| left: 320px; | |
| right: 0; | |
| margin-left: 320px; | |
| width: 320px; | |
| height: 180px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <p>Accept permission to use camera</p> | |
| <div class="video-holder" > | |
| <video id="myvideo1" class="thevideo" autoplay ></video> | |
| <canvas id='c1' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo2" class="thevideo" autoplay ></video> | |
| <canvas id='c2' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo3" class="thevideo" autoplay ></video> | |
| <canvas id='c3' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo4" class="thevideo" autoplay ></video> | |
| <canvas id='c4' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo5" class="thevideo" autoplay ></video> | |
| <canvas id='c5' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo6" class="thevideo" autoplay ></video> | |
| <canvas id='c6' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo7" class="thevideo" autoplay ></video> | |
| <canvas id='c7' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo8" class="thevideo" autoplay ></video> | |
| <canvas id='c8' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo9" class="thevideo" autoplay ></video> | |
| <canvas id='c9' width="320" height="180" class="c" /> | |
| </div> | |
| <div class="video-holder"> | |
| <video id="myvideo0" class="thevideo" autoplay ></video> | |
| <canvas id='c0' width="320" height="180" class="c" /> | |
| </div> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment