@omnimedia/omnitool/x/features/bg-remover/worker.bundle.js

open source video processing tools

import { defer, once } from "@e280/stz";
import { Comrade } from "@e280/comrade";
import { loadPipe } from "../parts/load-pipe.js";
import { exposeErrors } from "../parts/expose-errors.js";
const deferred = defer();
const makePrepare = (host) => once(async (spec) => {
    deferred.resolve({
        spec,
        pipe: await loadPipe({
            spec,
            task: "background-removal",
            onLoading: loading => host.loading(loading),
        })
    });
});
const canvas = new OffscreenCanvas(1920, 1080);
const ctx = canvas.getContext("2d");
await Comrade.worker(shell => {
    const prepare = makePrepare(shell.host);
    return {
        prepare: exposeErrors(prepare),
        remove: exposeErrors(async (request) => {
            const { pipe } = await deferred.promise;
            canvas.width = request.displayWidth;
            canvas.height = request.displayHeight;
            ctx?.drawImage(request, 0, 0);
            const output = await pipe(canvas);
            const mask = output[0];
            const frame = new VideoFrame(mask.toCanvas(), {
                timestamp: request.timestamp,
                duration: request.duration ?? undefined,
            });
            request.close();
            shell.transfer = [frame];
            return frame;
        })
    };
});
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