initial commit

backend/app/services/voice_service.py

@@ -0,0 +1,37 @@
+"""FluentGerman.ai — Voice service (API provider + browser fallback)."""
+
+import io
+
+import openai
+
+from app.config import get_settings
+
+
+async def transcribe(audio_bytes: bytes, filename: str = "audio.webm") -> str:
+    """Transcribe audio to text using OpenAI Whisper API."""
+    settings = get_settings()
+    client = openai.AsyncOpenAI(api_key=settings.llm_api_key)
+
+    audio_file = io.BytesIO(audio_bytes)
+    audio_file.name = filename
+
+    transcript = await client.audio.transcriptions.create(
+        model=settings.stt_model,
+        file=audio_file,
+    )
+    return transcript.text
+
+
+async def synthesize(text: str) -> bytes:
+    """Synthesize text to speech using OpenAI TTS API."""
+    settings = get_settings()
+    client = openai.AsyncOpenAI(api_key=settings.llm_api_key)
+
+    response = await client.audio.speech.create(
+        model=settings.tts_model,
+        voice=settings.tts_voice,
+        input=text,
+        response_format="mp3",
+    )
+
+    return response.content