use demucs with subprocess to separate music into bass, drums, vocals and other

src/separation/demucs_wrapper.py

@@ -0,0 +1,36 @@
+import subprocess
+import os
+
+def separate_audio_with_demucs(input_file: str, output_dir: str = './separated_output'):
+    """
+    Use subprocess to run Demucs separation on an input audio file.
+
+    Parameters:
+        input_file (str): Path to the input audio file to be separated.
+        output_dir (str): Directory where the separated output will be saved.
+    """
+    # Create the output directory if it does not exist
+    os.makedirs(output_dir, exist_ok=True)
+
+    # Demucs command to separate the audio file
+    # --out: specifies output directory
+    command = [
+        'demucs',
+        '--out', output_dir,  # Output directory for separated tracks
+        input_file            # Input file
+    ]
+    
+    try:
+        # Run the command as a subprocess
+        subprocess.run(command, check=True)
+        print(f"Separation completed. Output saved to {output_dir}")
+    except subprocess.CalledProcessError as e:
+        print(f"An error occurred while running Demucs: {e}")
+    except FileNotFoundError:
+        print("Demucs is not installed or not found in the system PATH.")
+
+if __name__ == "__main__":
+    # Example usage
+    input_audio_path = 'samples/pancakes_for_dinner.wav'  # Path to your audio file
+    output_folder = './separated_output'  # Where the separated files will be stored
+    separate_audio_with_demucs(input_audio_path, output_folder)