feat: add file existence checks to audio processing methods

src/utils/speech_recognition.py

@@ -21,8 +21,14 @@ def convert_to_wav(file_path: str) -> str:
         str: The path to the converted or original WAV file.
 
     Raises:
+        FileNotFoundError: If the file does not exist.
         RuntimeError: If the conversion fails for any reason.
     """
+    # Check if the file exists
+    if not os.path.exists(file_path):
+        logger.error(f"File {file_path} does not exist.")
+        raise FileNotFoundError(f"File {file_path} does not exist.")
+
     if file_path.lower().endswith('.wav'):
         logger.info(f"File {file_path} is already in WAV format.")
         return file_path
@@ -49,8 +55,14 @@ def get_audio_duration(file_path: str) -> float:
         float: The duration of the audio file in seconds.
 
     Raises:
+        FileNotFoundError: If the file does not exist.
         RuntimeError: If unable to get the file duration.
     """
+    # Check if the file exists
+    if not os.path.exists(file_path):
+        logger.error(f"File {file_path} does not exist.")
+        raise FileNotFoundError(f"File {file_path} does not exist.")
+
     try:
         logger.info(f"Getting duration of {file_path}.")
         audio = AudioSegment.from_file(file_path)
@@ -73,6 +85,7 @@ def convert_voice_to_text(file_path: str, language='ru') -> str:
         str: The transcribed text if recognition is successful.
 
     Raises:
+        FileNotFoundError: If the file does not exist.
         RuntimeError: For any errors encountered during processing.
     """
     # Check if the file exists