@omnimedia/omnitool/x/features/speech/transcribe/transcriber.js

open source video processing tools

import { Comrade } from "@e280/comrade";
import { coalesce, queue, sub } from "@e280/stz";
import { prepAudio } from "./parts/prep-audio.js";
export async function makeTranscriber({ driver, spec, workerUrl, onLoading }) {
    const onReport = sub();
    const onTranscription = sub();
    const thread = await Comrade.thread({
        label: "OmnitoolSpeechTranscriber",
        workerUrl,
        setupHost: () => ({
            loading: async (loading) => onLoading(loading),
            deliverReport: async (report) => onReport.pub(report),
            deliverTranscription: async (transcription) => onTranscription.pub(transcription),
        }),
    });
    await thread.work.prepare(spec);
    return {
        transcribe: queue(async (info) => {
            const { source, language } = info;
            const { audio, duration } = await prepAudio(driver, source);
            const detachCallbacks = coalesce(onReport(info.onReport), onTranscription(info.onTranscription));
            const result = await thread.work.transcribe({
                duration,
                language,
                audio: audio.buffer,
            });
            detachCallbacks();
            return result;
        }),
        dispose: thread.terminate()
    };
}
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