178 lines
5.2 KiB
HTML
178 lines
5.2 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<!-- ahhh -->
|
|
|
|
<body style="margin: 0; overflow: hidden">
|
|
<canvas
|
|
id="myCanvas"
|
|
width="10"
|
|
height="10"
|
|
style="display: block; box-sizing: border-box"
|
|
>
|
|
Your browser does not support the HTML5 canvas tag.</canvas
|
|
>
|
|
<script src="https://unpkg.com/@ffmpeg/ffmpeg@0.10.0/dist/ffmpeg.min.js"></script>
|
|
<script>
|
|
const { createFFmpeg } = FFmpeg;
|
|
const ffmpeg = createFFmpeg({
|
|
log: true,
|
|
});
|
|
|
|
const transcode = async (webcamData) => {
|
|
const message = document.getElementById("message");
|
|
const name = "record.webm";
|
|
await ffmpeg.load();
|
|
message.innerHTML = "Start transcoding";
|
|
await ffmpeg.write(name, webcamData);
|
|
await ffmpeg.transcode(name, "output.mp4");
|
|
message.innerHTML = "Complete transcoding";
|
|
const data = ffmpeg.read("output.mp4");
|
|
|
|
const video = document.getElementById("output-video");
|
|
video.src = URL.createObjectURL(
|
|
new Blob([data.buffer], { type: "video/mp4" })
|
|
);
|
|
dl.href = video.src;
|
|
dl.innerHTML = "download mp4";
|
|
};
|
|
|
|
fn().then(async ({ url, blob }) => {
|
|
transcode(new Uint8Array(await blob.arrayBuffer()));
|
|
});
|
|
|
|
function fn() {
|
|
var recordedChunks = [];
|
|
|
|
var time = 0;
|
|
var canvas = document.getElementById("canvas");
|
|
|
|
return new Promise(function (res, rej) {
|
|
var stream = canvas.captureStream(60);
|
|
|
|
mediaRecorder = new MediaRecorder(stream, {
|
|
mimeType: "video/webm; codecs=vp9",
|
|
});
|
|
|
|
mediaRecorder.start(time);
|
|
|
|
mediaRecorder.ondataavailable = function (e) {
|
|
recordedChunks.push(event.data);
|
|
// for demo, removed stop() call to capture more than one frame
|
|
};
|
|
|
|
mediaRecorder.onstop = function (event) {
|
|
var blob = new Blob(recordedChunks, {
|
|
type: "video/webm",
|
|
});
|
|
var url = URL.createObjectURL(blob);
|
|
res({ url, blob }); // resolve both blob and url in an object
|
|
|
|
myVideo.src = url;
|
|
// removed data url conversion for brevity
|
|
};
|
|
|
|
// for demo, draw random lines and then stop recording
|
|
var i = 0,
|
|
tid = setInterval(() => {
|
|
if (i++ > 20) {
|
|
// draw 20 lines
|
|
clearInterval(tid);
|
|
mediaRecorder.stop();
|
|
}
|
|
let canvas = document.querySelector("canvas");
|
|
let cx = canvas.getContext("2d");
|
|
cx.beginPath();
|
|
cx.strokeStyle = "green";
|
|
cx.moveTo(Math.random() * 100, Math.random() * 100);
|
|
cx.lineTo(Math.random() * 100, Math.random() * 100);
|
|
cx.stroke();
|
|
}, 200);
|
|
});
|
|
}
|
|
|
|
let c = document.getElementById("myCanvas");
|
|
let ctx = c.getContext("2d");
|
|
ctx.canvas.width = window.innerWidth;
|
|
ctx.canvas.height = window.innerHeight;
|
|
|
|
let deg_per_sec = 30 / 5000;
|
|
let time = 0.1;
|
|
let fps = 60;
|
|
|
|
centerX = ctx.canvas.width / 2;
|
|
centerY = ctx.canvas.height / 2;
|
|
|
|
rotation = 0; //was = j = angle
|
|
currentFrame = 0; //was = i
|
|
|
|
function render() {
|
|
if (currentFrame < time / (1 / fps)) {
|
|
setTimeout(() => {
|
|
render();
|
|
render_clear();
|
|
|
|
// Draw_Phyllotaxis(rotation + 3.1);
|
|
Draw_Phyllotaxis(rotation + 1.5);
|
|
console.log(rotation + 3.1);
|
|
// Draw_Phyllotaxis(rotation/5000);
|
|
|
|
// Draw_center(); //Debugging
|
|
// DrawBorder();
|
|
}, 1000 / fps);
|
|
rotation += deg_per_sec / fps; // was = j = angle, now = rotation
|
|
currentFrame += 1; // was = i
|
|
}
|
|
}
|
|
|
|
render();
|
|
|
|
function Draw_Phyllotaxis(angle) {
|
|
// colour1 = [255, 170, 0];
|
|
// colour2 = [255, 0, 221];
|
|
colour1 = [45, 129, 252];
|
|
colour2 = [252, 3, 98];
|
|
|
|
var c = 24; //something to do with width. but not width
|
|
|
|
for (let n = 0; n < 300; n += 1) {
|
|
ncolour = LerpRGB(colour1, colour2, Math.cos(rad(n / 2)));
|
|
var a = n * angle; //137.5;
|
|
var r = c * Math.sqrt(n);
|
|
var x = r * Math.cos(a) + centerX;
|
|
var y = r * Math.sin(a) + centerY;
|
|
|
|
ctx.beginPath();
|
|
ctx.arc(x, y, 8, 0, 2 * Math.PI);
|
|
ctx.fillStyle = colourToText(ncolour);
|
|
ctx.fill();
|
|
}
|
|
}
|
|
function rad(degrees) {
|
|
var pi = Math.PI;
|
|
return degrees * (pi / 180);
|
|
}
|
|
|
|
function LerpRGB(a, b, t) {
|
|
if (t < 0) {
|
|
t *= -1;
|
|
}
|
|
var newColor = [0, 0, 0];
|
|
newColor[0] = a[0] + (b[0] - a[0]) * t;
|
|
newColor[1] = a[1] + (b[1] - a[1]) * t;
|
|
newColor[2] = a[2] + (b[2] - a[2]) * t;
|
|
return newColor;
|
|
}
|
|
|
|
function colourToText(colour) {
|
|
return "rgb(" + colour[0] + "," + colour[1] + "," + colour[2] + ")";
|
|
}
|
|
|
|
function render_clear() {
|
|
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
|
|
ctx.fillStyle = "black";
|
|
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
|
|
}
|
|
</script>
|
|
</body>
|
|
</html>
|