add denoise & audio enhancement

app/services/audio_processor.py

@@ -24,10 +24,9 @@ class AudioProcessingError(Exception):
 
 
 class AudioProcessor:
-    """
-    Simple audio processor for file validation and handling.
-    Audio conversion is done in processor.py using ffmpeg.
-    """
+    ALLOWED_EXTENSIONS = settings.allowed_extensions
+    TARGET_SAMPLE_RATE = settings.sample_rate
+    TARGET_CHANNELS = settings.channels
     
     @classmethod
     def validate_file(cls, filename: str, file_size: int) -> None:
@@ -136,6 +135,31 @@ class AudioProcessor:
             .run(quiet=True, capture_stderr=True)
         )
         
+        
+    @classmethod
+    async def get_audio_duration(cls, filepath: Path) -> float:
+        """
+        Get audio file duration in seconds.
+        
+        Args:
+            filepath: Path to audio file
+            
+        Returns:
+            Duration in seconds
+        """
+        try:
+            loop = asyncio.get_event_loop()
+            probe = await loop.run_in_executor(
+                None, 
+                lambda: ffmpeg.probe(str(filepath))
+            )
+            
+            duration = float(probe['format'].get('duration', 0))
+            return duration
+            
+        except ffmpeg.Error as e:
+            logger.warning(f"Could not probe audio duration: {e}")
+            return 0.0
     @classmethod
     async def cleanup_files(cls, *paths: Path) -> None:
         """Remove temporary files."""