Fix case-sensitive MIME type check in Google Generative AI TTS

homeassistant/components/google_generative_ai_conversation/helpers.py

@@ -49,7 +49,7 @@ def _parse_audio_mime_type(mime_type: str) -> dict[str, int]:
         integers if found, otherwise None.
 
     """
-    if not mime_type.startswith("audio/L"):
+    if not mime_type.lower().startswith("audio/l"):
         LOGGER.warning("Received unexpected MIME type %s", mime_type)
         raise HomeAssistantError(f"Unsupported audio MIME type: {mime_type}")
 
@@ -65,9 +65,9 @@ def _parse_audio_mime_type(mime_type: str) -> dict[str, int]:
             with suppress(ValueError, IndexError):
                 rate_str = param.split("=", 1)[1]
                 rate = int(rate_str)
-        elif param.startswith("audio/L"):
+        elif param.lower().startswith("audio/l"):
             # Keep bits_per_sample as default if conversion fails
             with suppress(ValueError, IndexError):
-                bits_per_sample = int(param.split("L", 1)[1])
+                bits_per_sample = int(param.upper().split("L", 1)[1])
 
     return {"bits_per_sample": bits_per_sample, "rate": rate}

tests/components/google_generative_ai_conversation/test_helpers.py

@@ -0,0 +1,28 @@
+"""Tests for the Google Generative AI Conversation helpers."""
+
+from __future__ import annotations
+
+import pytest
+
+from homeassistant.components.google_generative_ai_conversation.helpers import (
+    _parse_audio_mime_type,
+)
+from homeassistant.exceptions import HomeAssistantError
+
+
+def test_parse_audio_mime_type_uppercase() -> None:
+    """Test parsing uppercase MIME type audio/L16;rate=24000."""
+    result = _parse_audio_mime_type("audio/L16;rate=24000")
+    assert result == {"bits_per_sample": 16, "rate": 24000}
+
+
+def test_parse_audio_mime_type_lowercase() -> None:
+    """Test parsing lowercase MIME type audio/l16; rate=24000; channels=1."""
+    result = _parse_audio_mime_type("audio/l16; rate=24000; channels=1")
+    assert result == {"bits_per_sample": 16, "rate": 24000}
+
+
+def test_parse_audio_mime_type_unsupported_raises() -> None:
+    """Test that an unsupported MIME type raises HomeAssistantError."""
+    with pytest.raises(HomeAssistantError):
+        _parse_audio_mime_type("video/mp4")