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#305 TWO new demos added.
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Canvas+Mp3 as well as Canvas+Microphone+Mp3:
https://www.webrtc-experiment.com/RecordRTC/Canvas-Recording/
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@muaz-khan
muaz-khan committed Jul 28, 2017
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388 changes: 388 additions & 0 deletions Canvas-Recording/Canvas-Animation-Recording-Plus-Microphone-Plus-Mp3.html
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0, user-scalable=no">

<title>Canvas2D + Microphone + Mp3 Recording using RecordRTC</title>
<meta name="description" content="Record canvas animation using RecordRTC.">
<meta name="author" content="Muaz Khan"><link rel="author" type="text/html" href="https://plus.google.com/100325991024054712503">
<style>
/* Muaz Khan (@muazkh) */

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</style>
</head>
<body>
<h1>
Canvas2D+Microphone+Mp3: click to <button id="btn-record-webm" style="font-size:inherit;">Record as WebM</button>
</h1>
<section>
<canvas id="canvas"></canvas>
</section>
<script>
if(!innerWidth) var innerWidth = document.body.clientWidth;
if(!innerHeight) var innerHeight = document.body.clientHeight;
innerHeight = innerHeight - (innerHeight / 3);

document.createElement("canvas").getContext?(function(){function a(){s.closePath(),s.fillStyle="rgba("+parseInt(Math.random()*255)+", "+parseInt(Math.random()*255)+", "+parseInt(Math.random()*255)+", .9)",s.fill(),s.beginPath()}function l(){var v;c+=5,h===1&&(t+=5,o+=5,n+=5,u+=5,c>20&&(h=2)),h===2&&(t-=5,o-=5,n-=5,u-=5,c>40&&(h=3)),h===3&&(f+=5,r+=5,i+=5,e+=5,c>60&&(h=4)),h===4&&(f-=5,r-=5,i-=5,e-=5,c>80&&(c=0,h=1)),s.clearRect(0,0,5e4,5e4);var y=[[t,n],[t,n],[t+269,n+69],[t+269,n+69],[t+211,n-162],[t+211,n-162],[t+23,n-213],[t+23,n-213],[t-165,n-60],[t-165,n-60],[t-72,n+116],[t-72,n+116],[t+74,n+117],[t+74,n+117],[t+128,n+128],[t+128,n+128],[t+274,n+15],[t+274,n+15],[t+137,n-158],[t+137,n-158],[t-80,n-97],[t-80,n-97],[t-114,n-10],[t-114,n-10],[t-165,n-57],[t-165,n-57],[t-72,n+118],[t-72,n+118],[t+72,n+117],[t+72,n+117],[t+268,n+67],[t+268,n+67],[t+211,n-162],[t+211,n-162],[t+24,n-211],[t+24,n-211]],p=[[f,i,r,e,o,u],[f+95,i+139,r-46,e+104,o,u],[f+186,i+153,r-44,e+97,o+29,u+3],[f+326,i+112,r+24,e+55,o+29,u+3],[f+317,i+12,r-7,e+77,o+5,u-65],[f+262,i-64,r-58,e-55,o+5,u-65],[f+154,i-43,r-116,e+6,o-88,u-76],[f+72,i-84,r-187,e-35,o-88,u-76],[f-81,i+111,r-162,e+70,o-142,u-39],[f-51,i+31,r-195,e-15,o-142,u-39],[f+78,i+239,r-123,e+142,o-124,u+47],[f-9,i+207,r-250,e+109,o-124,u+47],[f+107,i+229,r-162,e+130,o-55,u+61],[f+206,i+213,r-81,e+127,o-55,u+61],[f+196,i+191,r+67,e+166,o+151,u+108],[f+250,i+283,r+110,e+204,o+151,u+108],[f+283,i+100,r+87,e+12,o+136,u-78],[f+409,i+38,r+137,e-10,o+136,u-78],[f+164,i-44,r-76,e-50,o-36,u-163],[f+204,i-101,r-53,e-107,o-36,u-163],[f+23,i-2,r-156,e-53,o-118,u-132],[f-43,i-51,r-162,e-77,o-118,u-132],[f-26,i+101,r-190,e+86,o-189,u+73],[f-65,i+121,r-264,e+117,o-189,u+73],[f-65,i+121,r-264,e+117,o-363,u-30],[f-55,i+5,r-326,e-61,o-363,u-30],[f-61,i+140,r-261,e+205,o-239,u+204],[f+101,i+266,r-208,e+249,o-239,u+204],[f+110,i+237,r-161,e+190,o-22,u+238],[f+110,i+237,r+47,e+161,o-22,u+238],[f+309,i+214,r+121,e+202,o+254,u+160],[f+309,i+214,r+192,e+61,o+254,u+160],[f+325,i+14,r+161,e-98,o+178,u-203],[f+239,i-124,r+116,e-130,o+178,u-203],[f+179,i-105,r-74,e-175,o-104,u-255],[f+13,i-51,r-152,e-169,o-104,u-255]],w=36;for(v=0;v<w;v++)s.moveTo(y[v][0],y[v][1]),s.bezierCurveTo(p[v][0],p[v][1],p[v][2],p[v][3],p[v][4],p[v][5]),s.translate(y[v][0],y[v][1]),s.rotate(.001),s.translate(-y[v][0],-y[v][1]),a();oninterval(l)}var s;window.oninterval=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(n){window.setTimeout(n,1e3/60)}}(),s=document.getElementById("canvas").getContext("2d"),s.canvas.width=innerWidth,s.canvas.height=innerHeight,s.lineWidth=2;var c=0,h=1,t=396,n=342,f=339,i=232,r=529,e=255,o=498,u=322;l()})():(alert("Your browser is not supporting HTML5 Canvas APIs!"))
</script>

<script>
(function () {
if (!document.createElement('canvas').getContext) {
document.body.innerHTML = '<h1 style="height:auto;color:red;font-size:30px;">Excuse me Sir,<br /><br />You are using very old web-browser!<br /><br />Please upgrade it.</h1>';
}
var prepend = function (parent, elementToPrepend)
{
return parent.insertBefore(elementToPrepend, parent.firstChild);
};

var div = document.createElement('div');

div.innerHTML = '<g:plusone size="tall"></g:plusone>';
div.className = 'gplus-button';
div.style.position = 'absolute';
div.style.top = 0;
div.style.padding = '3px 0';
div.style.right = '30px';

var body = document.body;

if(body.insertBefore) prepend(body, div);
else document.body.appendChild(div);
})();


(function () {
var lastTime = 0, vendors = ['ms', 'moz', 'webkit', 'o'];
for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'RequestCancelAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function (callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function () {
callback(currTime + timeToCall);
}, timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function (id) {
clearTimeout(id);
};
}());
</script>

<!-- below section handles RecordRTC and WhammyRecorder -->

<script src="https://cdn.webrtc-experiment.com/RecordRTC.js"></script>
<script src="https://cdn.webrtc-experiment.com/FileSelector.js"></script>
<script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>

<script>
function getMicrophone(callback) {
navigator.mediaDevices.getUserMedia({audio: true}).then(callback);
}

function getMicrophoneAndMp3(callback) {
getMp3Stream(function(mp3Stream) {
getMicrophone(function(microphoneStream) {
var audio = document.createElement('audio');
audio.muted = true;
audio.volume = 0;
audio.src = URL.createObjectURL(microphoneStream);
audio.play();

(document.body || document.documentElement).appendChild(audio);

callback(microphoneStream, mp3Stream);
});
});
}

function getMixedAudioStreamXYZ(arrayOfAudioStreams) {
var audioContext = new AudioContext();

var audioSources = [];

var gainNode = audioContext.createGain();
gainNode.connect(audioContext.destination);
gainNode.gain.value = 0; // don't hear self

var audioTracksLength = 0;
arrayOfAudioStreams.forEach(function(stream) {
if (!stream.getAudioTracks().length) {
return;
}

audioTracksLength++;

var audioSource = audioContext.createMediaStreamSource(stream);
audioSource.connect(gainNode);
audioSources.push(audioSource);
});

if (!audioTracksLength) {
return;
}

audioDestination = audioContext.createMediaStreamDestination();
audioSources.forEach(function(audioSource) {
audioSource.connect(audioDestination);
});

return audioDestination.stream;
}

document.getElementById('btn-record-webm').onclick = function() {
this.disabled = true;

getMicrophoneAndMp3(function(microphoneStream, mp3Stream) {
var canvas = document.getElementById('canvas');
var canvasStream = canvas.captureStream();

var mixedAudioStream = getMixedAudioStreamXYZ([microphoneStream, mp3Stream]);

var finalStream = new MediaStream();
mixedAudioStream.getAudioTracks().forEach(function(track) {
finalStream.addTrack(track);
});
canvasStream.getVideoTracks().forEach(function(track) {
finalStream.addTrack(track);
});

var recorder = RecordRTC(finalStream, {
type: 'video'
});

recorder.startRecording();

var stop = false;

(function looper() {
if(stop) {
recorder.stopRecording(function() {
var blob = recorder.getBlob();
document.body.innerHTML = '<video controls src="' + URL.createObjectURL(blob) + '" autoplay loop></video>';

mixedAudioStream.stop();
canvasStream.stop();

mp3Stream.stop();
microphoneStream.stop();
});
return;
}
setTimeout(looper, 100);
})();

var seconds = 15;
var interval = setInterval(function() {
seconds--;
if(document.querySelector('h1')) {
document.querySelector('h1').innerHTML = seconds + ' seconds remaining.';
}
}, 1000);

setTimeout(function() {
clearTimeout(interval);
stop = true;
}, seconds * 1000);
});
};

function getMp3Stream(callback) {
var selector = new FileSelector();
selector.accept = '*.mp3';
selector.selectSingleFile(function(file) {
if(!file || !file.size) {
alert('Please try again by selecting a valid mp3 file.');
return;
}

var reader = new FileReader();
reader.file = file;
reader.onload = (function(e) {
// Import callback function
// provides PCM audio data decoded as an audio buffer
context.decodeAudioData(e.target.result, function(buffer) {
createSoundSource(buffer, callback);
});
});
reader.readAsArrayBuffer(reader.file);
});
}

window.AudioContext = window.AudioContext || window.webkitAudioContext;
var context = new AudioContext();
var gainNode = context.createGain();
gainNode.connect(context.destination);
gainNode.gain.value = 0; // don't play for self

function createSoundSource(buffer, callback) {
var soundSource = context.createBufferSource();
soundSource.loop = true;
soundSource.buffer = buffer;
soundSource.start(0, 0 / 1000);
soundSource.connect(gainNode);
var destination = context.createMediaStreamDestination();
soundSource.connect(destination);

// durtion=second*1000 (milliseconds)
callback(destination.stream);
}
</script>
</body>
</html>

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