add workflow parsing for mp3 and opus formats (#3832)

src/scripts/metadata/ogg.ts

@@ -0,0 +1,30 @@
+export async function getOggMetadata(file: File) {
+  const reader = new FileReader()
+  const read_process = new Promise(
+    (r) => (reader.onload = (event) => r(event?.target?.result))
+  )
+  reader.readAsArrayBuffer(file)
+  const arrayBuffer = (await read_process) as ArrayBuffer
+  const signature = String.fromCharCode(...new Uint8Array(arrayBuffer, 0, 4))
+  if (signature !== 'OggS') console.error('Invalid file signature.')
+  let oggs = 0
+  let header = ''
+  while (header.length < arrayBuffer.byteLength) {
+    const page = String.fromCharCode(
+      ...new Uint8Array(arrayBuffer, header.length, header.length + 4096)
+    )
+    if (page.match('OggS\u0000')) oggs++
+    header += page
+    if (oggs > 1) break
+  }
+  let workflow, prompt
+  let prompt_s = header
+    .match(/prompt=(\{.*?(\}.*?\u0000))/s)?.[1]
+    ?.match(/\{.*\}/)?.[0]
+  if (prompt_s) prompt = JSON.parse(prompt_s)
+  let workflow_s = header
+    .match(/workflow=(\{.*?(\}.*?\u0000))/s)?.[1]
+    ?.match(/\{.*\}/)?.[0]
+  if (workflow_s) workflow = JSON.parse(workflow_s)
+  return { prompt, workflow }
+}