chore: update public repo

utils/opus.ts

@@ -0,0 +1,30 @@
+import { Bytes, write } from '@fuman/io'
+import { $ } from 'zx'
+
+export async function generateOpusImageBlob(image: Uint8Array) {
+  // todo we should probably not use ffprobe here but whatever lol
+  const proc = $`ffprobe -of json -v error -show_entries stream=codec_name,width,height pipe:0`
+  proc.stdin.write(image)
+  proc.stdin.end()
+  const json = await proc.json()
+
+  const img = json.streams[0]
+  // https://www.rfc-editor.org/rfc/rfc9639.html#section-8.8
+  const mime = img.codec_name === 'mjpeg' ? 'image/jpeg' : 'image/png'
+  const description = 'Cover Artwork'
+
+  const res = Bytes.alloc(image.length + 128)
+  write.uint32be(res, 3) // picture type = album cover
+  write.uint32be(res, mime.length)
+  write.rawString(res, mime)
+  write.uint32be(res, description.length)
+  write.rawString(res, description)
+  write.uint32be(res, img.width)
+  write.uint32be(res, img.height)
+  write.uint32be(res, 0) // color depth
+  write.uint32be(res, 0) // color index (unused, for gifs)
+  write.uint32be(res, image.length)
+  write.bytes(res, image)
+
+  return res.result()
+}