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New demo to use canvas element with EchoTest plugin (#2261)
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@lminiero
lminiero committed Jul 2, 2020
1 parent 535a364 commit 9e2ebaa
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Janus WebRTC Server: Canvas Capture</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/webrtc-adapter/6.4.0/adapter.min.js" ></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js" ></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery.blockUI/2.70/jquery.blockUI.min.js" ></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/bootbox.js/5.4.0/bootbox.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/spin.js/2.3.2/spin.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.4/toastr.min.js"></script>
<script type="text/javascript" src="janus.js" ></script>
<script type="text/javascript" src="canvas.js"></script>
<script>
$(function() {
$(".navbar-static-top").load("navbar.html", function() {
$(".navbar-static-top li.dropdown").addClass("active");
$(".navbar-static-top a[href='canvas.html']").parent().addClass("active");
});
$(".footer").load("footer.html");
});
</script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootswatch/3.4.0/cerulean/bootstrap.min.css" type="text/css"/>
<link rel="stylesheet" href="css/demo.css" type="text/css"/>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css"/>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.4/toastr.min.css"/>
</head>
<body>

<a href="https://github.com/meetecho/janus-gateway"><img style="position: absolute; top: 0; left: 0; border: 0; z-index: 1001;" src="https://s3.amazonaws.com/github/ribbons/forkme_left_darkblue_121621.png" alt="Fork me on GitHub"></a>

<nav class="navbar navbar-default navbar-static-top">
</nav>

<div class="container">
<div class="row">
<div class="col-md-12">
<div class="page-header">
<h1>Plugin Demo: Canvas Capture
<button class="btn btn-default" autocomplete="off" id="start">Start</button>
</h1>
</div>
<div class="container" id="details">
<div class="row">
<div class="col-md-12">
<h3>Demo details</h3>
<p>This is a variant of the Echo Test demo meant to showcase how
you can use an HTML5 <code>canvas</code> element as a WebRTC media
source: everything is exactly the same in term of available controls,
features, and the like, with the substantial difference that we'll
play a bit with what we'll send on the video stream.</p>
<p>More precisely, the demo captures the webcam feed via a
<code>getUserMedia</code> call to use as a background in a
<code>canvas</code> element, and then presents some basic controls
to add some text dynamically; an image is also statically added
to the element as well. The <code>canvas</code> element is then used
as the actual source of media for our PeerConnection, which means the
video we get back from the EchoTest plugin should reflect the
tweaks we've made on the stream.</p>
<p>Notice that this is a very naive implementation, with many
hardcoded assumptions about video resolution and other things, and may not
perform very well either: it's only meant to showcase an interesting
approach that can be used for WebRTC, so you're encouraged to dig
deeper yourself to see how to make the <code>canvas</code>
processing more efficient and cooler. The code for this demo comes from a
<a href="https://youtu.be/zwYUojfm0hY?t=2140" target="blank">Dangerous Demo</a>
we showed during a past edition of Kamailio World; you can read more details in a
<a href="https://www.meetecho.com/blog/firefox-webrtc-youtube-kinda/" target="blank">blog post</a>
we wrote on the Meetecho blog after the fact.</p>
<p>Press the <code>Start</code> button above to launch the demo.</p>
</div>
</div>
</div>
<div class="container hide" id="videos">
<div class="row">
<div class="col-md-6">
<div class="row">
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">Local Stream
<div class="btn-group btn-group-xs pull-right hide">
<button class="btn btn-danger" autocomplete="off" id="toggleaudio">Disable audio</button>
<button class="btn btn-danger" autocomplete="off" id="togglevideo">Disable video</button>
<div class="btn-group btn-group-xs">
<button id="bitrateset" autocomplete="off" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
Bandwidth<span class="caret"></span>
</button>
<ul id="bitrate" class="dropdown-menu" role="menu">
<li><a href="#" id="0">No limit</a></li>
<li><a href="#" id="128">Cap to 128kbit</a></li>
<li><a href="#" id="256">Cap to 256kbit</a></li>
<li><a href="#" id="512">Cap to 512kbit</a></li>
<li><a href="#" id="1024">Cap to 1mbit</a></li>
<li><a href="#" id="1500">Cap to 1.5mbit</a></li>
<li><a href="#" id="2000">Cap to 2mbit</a></li>
</ul>
</div>
</div>
</h3>
</div>
<div class="panel-body" id="videoleft">
<video class="rounded centered hide" id="myvideo" width="432" height="240" muted="muted"></video>
<canvas id="canvas" width="432" height="240" style="display: block; margin: auto; padding: 0"></canvas>
</div>
</div>
</div>
<div class="row">
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">Tweaks</h3>
</div>
<div class="panel-body" id="tweaks">
<div class="input-group margin-bottom-sm">
<span class="input-group-addon"><i class="fa fa-font fa-fw"></i></span>
<input class="form-control" type="text" autocomplete="off" id="font" onkeypress="return checkEnter(event);"></input>
</div>
<div class="input-group margin-bottom-sm">
<span class="input-group-addon"><i class="fa fa-eraser fa-fw"></i></span>
<input class="form-control" type="text" autocomplete="off" id="color" onkeypress="return checkEnter(event);"></input>
</div>
<div class="input-group margin-bottom-sm">
<span class="input-group-addon"><i class="fa fa-text-width fa-fw"></i></span>
<input class="form-control" type="text" autocomplete="off" id="posX" onkeypress="return checkEnter(event);"></input>
</div>
<div class="input-group margin-bottom-sm">
<span class="input-group-addon"><i class="fa fa-text-height fa-fw"></i></span>
<input class="form-control" type="text" autocomplete="off" id="posY" onkeypress="return checkEnter(event);"></input>
</div>
<div class="input-group margin-bottom-sm">
<span class="input-group-addon"><i class="fa fa-edit fa-fw"></i></span>
<input class="form-control" type="text" autocomplete="off" id="text" onkeypress="return checkEnter(event);"></input>
</div>
</div>
</div>
</div>
</div>
<div class="col-md-6">
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">Remote Stream <span class="label label-primary hide" id="curres"></span> <span class="label label-info hide" id="curbitrate"></span></h3>
</div>
<div class="panel-body" id="videoright"></div>
</div>
</div>
</div>
</div>
</div>
</div>

<hr>
<div class="footer">
</div>
</div>

</body>
</html>
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