Add alternative language codes to RTSP input

Introduce support for alternative language codes in AudioRTSPInputStream. Adds an optional alternative_language_codes parameter (Optional[List[str]]) to the constructor and docstring, stores it as self._alternative_language_codes (defaulting to an empty list), and includes it in the audio JSON payload sent to registered audio callbacks. No other behavior changes.

Author: openminddev

src/om1_speech/audio/audio_rtsp_input_stream.py

@@ -136,6 +136,8 @@ class AudioRTSPInputStream:
         A callback function that receives audio data chunks (default: None)
     language_code: str, optional
         The language for the ASR to listen. (default: en-US)
+    alternative_language_codes: List[str], optional
+        A list of alternative language codes for the ASR to consider (default: None)
     rtsp_url : str, optional
         The RTSP URL of the audio stream. If None, uses device or device_name to determine the URL.
         (default: "rtsp://localhost:8554/audio")
@@ -149,6 +151,7 @@ def __init__(
         audio_data_callback: Optional[Callable] = None,
         audio_data_callbacks: Optional[List[Callable]] = None,
         language_code: Optional[str] = None,
+        alternative_language_codes: Optional[List[str]] = None,
         enable_tts_interrupt: bool = False,
     ):
         self._rate = rate
@@ -164,6 +167,9 @@ def __init__(
             self._language_code = language_code
             logger.info(f"Using specified language code: {self._language_code}")
 
+        # Alternative language codes
+        self._alternative_language_codes = alternative_language_codes or []
+
         # Callback for audio data
         self._audio_data_callbacks = audio_data_callbacks or []
         self.register_audio_data_callback(audio_data_callback)
@@ -447,6 +453,7 @@ def generator(self) -> Generator[Dict[str, Union[bytes, int]], None, None]:
                 "audio": base64.b64encode(b"".join(data)).decode("utf-8"),
                 "rate": self._rate,
                 "language_code": self._language_code,
+                "alternative_language_codes": self._alternative_language_codes,
             }
             for audio_callback in self._audio_data_callbacks:
                 audio_callback(json.dumps(response))