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record.js
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record.js
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// import GIF from "../vendor/gif.js";
// import workerScript from "../vendor/gif.worker.js.as-url";
import Whammy from "../vendor/whammy";
import { GIFEncoder } from "gifenc";
export function isWebCodecsSupported() {
return typeof window.VideoEncoder === "function";
}
function detectWebM() {
var elem = document.createElement("canvas");
if (!!(elem.getContext && elem.getContext("2d"))) {
// was able or not to get WebP representation
return elem.toDataURL("image/webp").indexOf("data:image/webp") == 0;
} else {
// very old browser like IE 8, canvas not supported
return false;
}
}
let _isWebM = detectWebM();
export function isWebMSupported() {
return _isWebM;
}
export function isFrameSequenceSupported() {
return typeof window.showDirectoryPicker === "function";
}
export default function createRecorder(canvas, render, opts = {}) {
const {
duration = 5,
fps = 30,
qualityPreset = "high",
format = "mp4",
transparent = false,
quantizeWithAlpha = true, // for GIF
backgroundColor = [0, 0, 0], // for GIF
knownColors = [], // for GIF quantization
width = 512,
height = 512,
progress = (v) => {},
start = () => {},
finish = () => {},
} = opts;
const totalFrames = Math.ceil(fps * duration);
const fpsInterval = 1 / fps;
const frames = new Array(totalFrames).fill(0).map((_, i) => i);
let cancelled = false;
let timeHandle = null;
let frameIndex = 0;
let finished = false;
const totalPasses = 1; // for other formats maybe?
let resolve;
const promise = new Promise((cb) => {
resolve = cb;
});
let encoder;
getEncoder().then(
(e) => {
if (e === null) cancelled = true;
encoder = e;
if (cancelled) {
// if we cancelled while fetching the encoder
resolve(null);
} else {
start();
timeHandle = setTimeout(tick, 0);
}
},
(err) => {
if (err) console.error(err);
cancelled = true;
resolve(null);
}
);
return {
ready: promise,
cancel() {
cancelled = true;
clearTimeout(timeHandle);
if (encoder) encoder.cancel();
finishEncoding();
},
};
function getEncoder() {
if (format === "mp4") {
if (!isWebCodecsSupported()) {
throw new Error("format { mp4 } but WebCodecs is not supported");
}
return window.loadMP4Module().then((MP4) => MP4Encoder(MP4));
} else if (format === "gif") {
return FastGIFEncoder();
} else if (format === "sequence") {
return SequenceExporter();
} else {
return WebMEncoder();
}
}
function finishEncoding() {
if (finished) return;
finished = true;
let p = encoder.end();
if (cancelled) {
resolve(null);
finish();
} else {
p.then((buffer) => {
resolve(cancelled ? null : buffer);
finish();
});
}
}
async function tick() {
if (cancelled) return;
if (frameIndex < totalFrames) {
// console.log("Rendering Frame %d / %d", frameIndex + 1, totalFrames);
const imgData = render({
deltaTime: fpsInterval,
frame: frameIndex,
totalFrames,
});
await encoder.addFrame(imgData, frameIndex);
if (format !== "gif") {
// TODO: should clean this up, encoders should send progress...
progress({
progress: frameIndex / totalFrames,
totalPasses,
pass: 0,
});
}
frameIndex++;
timeHandle = setTimeout(tick, 0);
} else {
finishEncoding();
}
}
function nextEvent(target, name) {
return new Promise((resolve) => {
target.addEventListener(name, resolve, { once: true });
});
}
async function SequenceExporter() {
let dir;
try {
dir = await window.showDirectoryPicker();
} catch (err) {
if (err.code === 20 || err.name === "AbortError") {
// don't warn on abort
return null;
} else {
throw err;
}
}
return {
async addFrame(frameData, frameIndex) {
const { extension = "", prefix = "", type = "" } = frameData;
const frameDigitCount = String(totalFrames).length;
const curFrameName = String(frameIndex).padStart(frameDigitCount, "0");
const curFrameFile = `${prefix}${curFrameName}${extension}`;
const fh = await dir.getFileHandle(curFrameFile, { create: true });
const fw = await fh.createWritable();
let blob;
if (frameData.url) {
blob = createBlobFromDataURL(frameData.url);
} else {
const data = frameData.data || "";
const parts = Array.isArray(data) ? data : [data];
blob = new window.Blob(parts, { type });
}
await fw.write(blob);
await fw.close();
},
cancel() {},
async end() {
console.log("Finished");
},
};
}
async function WebMEncoder() {
const quality = 0.95;
const encoder = new Whammy.Video(fps, quality);
const webpCanvas = document.createElement("canvas");
const webpContext = webpCanvas.getContext("2d");
const images = [];
let cancelled = false;
return {
async addFrame(imageData) {
webpCanvas.width = imageData.width;
webpCanvas.height = imageData.height;
webpContext.putImageData(imageData, 0, 0);
const url = webpCanvas.toDataURL("image/webp", encoder.quality);
images.push(url);
},
cancel() {
cancelled = true;
},
async end() {
return new Promise((resolve) => {
if (cancelled) {
resolve(null);
} else {
const webm = Whammy.fromImageArray(images, fps, false);
resolve(webm);
}
});
},
};
}
async function MP4Encoder(MP4) {
const encoder = MP4.createWebCodecsEncoder({
width,
height,
fps,
});
return {
async addFrame(imageData) {
// Create a bitmap out of the frame
const bitmap = await createImageBitmap(imageData);
// Add bitmap to encoder
await encoder.addFrame(bitmap);
},
cancel() {},
async end() {
return encoder.end();
},
};
}
async function FastGIFEncoder() {
const fpsInterval = 1 / fps;
const delay = fpsInterval * 1000;
const gif = GIFEncoder({ auto: false });
gif.writeHeader();
const frames = new Array(totalFrames).fill(null);
let workerIndex = 0;
const events = [];
const workerCount = 2;
let remainingFramesToProcess = totalFrames;
let finishResolve;
const finishPromise = new Promise((cb) => {
finishResolve = cb;
});
const workers = new Array(workerCount).fill(null).map(() => {
const worker = new Worker("./gifworker.js");
worker.addEventListener("message", (ev) => {
const { frame, data } = ev.data;
frames[frame] = data;
remainingFramesToProcess--;
// we send progress only when we finish encoding a frame
progress({
progress: (totalFrames - remainingFramesToProcess) / totalFrames,
totalFrames,
totalPasses,
pass: 0,
});
if (remainingFramesToProcess <= 0) {
finishResolve();
}
});
return worker;
});
async function waitForFrame(worker, frame) {
return new Promise((resolve) => {
const handler = (ev) => {
worker.removeEventListener("message", handler);
if (ev.data[0] === frame) resolve(ev);
};
worker.addEventListener("message", handler, { passive: true });
});
}
return {
async addFrame(imageData, frame) {
const next = workers[workerIndex++ % workers.length];
next.postMessage(
{
transparent,
quantizeWithAlpha,
backgroundColor,
knownColors,
frame,
repeat: 0,
delay,
width,
height,
data: imageData.data,
},
[imageData.data.buffer]
);
},
cancel() {},
async end() {
await finishPromise;
for (let i = 0; i < frames.length; i++) {
gif.stream.writeBytesView(frames[i]);
}
gif.finish();
workers.forEach((w) => w.terminate());
return gif.bytesView();
},
};
}
}
function createBlobFromDataURL(dataURL) {
const splitIndex = dataURL.indexOf(",");
if (splitIndex === -1) {
return new Blob();
}
const base64 = dataURL.slice(splitIndex + 1);
const byteString = atob(base64);
const type = dataURL.slice(0, splitIndex);
const mimeMatch = /data:([^;]+)/.exec(type);
const mime = (mimeMatch ? mimeMatch[1] : "") || undefined;
const ab = new ArrayBuffer(byteString.length);
const ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return new Blob([ab], { type: mime });
}