Fix Piper 1.2+ synthesize API: use wave.open with BytesIO buffer

main.py

@@ -7,6 +7,7 @@ import uuid
 from fastapi.responses import Response
 from io import BytesIO
 import requests
+import wave
 from pathlib import Path
 
 app = FastAPI(title="Piper TTS Space")
@@ -90,9 +91,13 @@ async def tts(request: TTSRequest):
         raise HTTPException(400, f"Voice load failed: {str(e)}")
     
     try:
+        # Piper 1.2+ requires wav_file parameter - use wave.open with BytesIO
         buffer = BytesIO()
-        # Piper 1.2+ requires wav_file parameter
-        voice.synthesize(request.text, speaker_id=request.speaker_id, wav_file=buffer)
+        with wave.open(buffer, 'wb') as wav_file:
+            wav_file.setnchannels(1)
+            wav_file.setsampwidth(2)  # 16-bit
+            wav_file.setframerate(request.sample_rate)
+            voice.synthesize(request.text, speaker_id=request.speaker_id, wav_file=wav_file)
         buffer.seek(0)
         return Response(
             content=buffer.read(),