iroh fog discord bot prompt generator

main.ts

// deployed via deno deploy (free plan) and call with
// https://posh-eel-46.deno.dev/?q=https://url.to/some-media.mp3

const image = "ghcr.io/ggerganov/whisper.cpp:main";
const model = "tiny"; // see https://github.com/ggerganov/whisper.cpp/blob/master/models/download-ggml-model.sh#L28
const maxDuration = 1000 * 10; // 10s

function build(url: string) {
  const prepare = "mkdir /models";
  const fetchModel =
    `./models/download-ggml-model.sh ${model} /models > /dev/null 2> /dev/null`;
  const curl = `curl -s -o /uploads/media.mp3 '${url}'`;
  const ffmpeg = `ffmpeg
        -hide_banner -loglevel error
        -i /uploads/media.mp3
        -ar 16000 -ac 1 -c:a pcm_s16le
        /tmp/media.wav`;
  const transcribe = `./main 
        -m /models/ggml-${model}.bin 
        --language auto
        --output-txt
        --no-timestamps
        --duration ${maxDuration}
        -f /tmp/media.wav
        -of /uploads/transcript.txt`;
  const result = `cat /uploads/transcript.txt`;

  const debugMsg = `transcribed ${url} (first ${maxDuration} seconds)`;
  const debug = `echo '${debugMsg}' >&2`;

  const command = [prepare, fetchModel, curl, ffmpeg, transcribe, result, debug]
    .join(" && ")
    .replace("\n", " ")
    .replace(/\s+/g, " ");
  return `/docker image:${image} command:"${command}"`;
}

Deno.serve((req: Request) => {
  const url = new URL(req.url);
  const q = url.searchParams.get("q");
  if (!q) {
    return new Response("Missing `q` query parameter with media URL", {
      status: 400,
    });
  }
  const res = build(q);
  return new Response(res);
});