fix: write generated audio to fal storage

fal_app.py

@@ -1,11 +1,14 @@
 import io
+from pathlib import Path
+from audiocraft.data.audio import audio_write
 import fal
 from fastapi import WebSocket
 import torch
-from fal.toolkit import File
 
 from prompts import PROMPTS
 
+DATA_DIR = Path("/data/audio")
+
 
 class InfinifiFalApp(fal.App, keep_alive=300):
     machine_type = "GPU-A6000"
@@ -41,9 +44,18 @@ async def run_ws(self, ws: WebSocket):
 
         wav = self.model.generate(PROMPTS)
 
-        for one_wav in enumerate(wav):
-            buf = io.BytesIO()
-            torch.save(one_wav, buf)
-            await ws.send_bytes(buf.getvalue())
+        for i, one_wav in enumerate(wav):
+            path = DATA_DIR.joinpath(f"{i}")
+            audio_write(
+                path,
+                one_wav.cpu(),
+                self.model.sample_rate,
+                format="mp3",
+                strategy="loudness",
+                loudness_compressor=True,
+            )
+            with open(path, "rb") as f:
+                data = f.read()
+                await ws.send_bytes(data)
 
         await ws.close()