Add WAV file support with MP3 conversion and reuse

- Add support for WAV files with automatic conversion to MP3
- Save converted MP3 files in the same directory as WAV files
- Reuse existing MP3 files if already converted
- Update documentation and requirements

src/utils.py

@@ -1,8 +1,10 @@
 # Helper functions for mknotes
 
 import os
+import tempfile
+from pydub import AudioSegment
 
-def find_audio_files(directory, extensions=(".mp3", ".m4a")):
+def find_audio_files(directory, extensions=(".mp3", ".m4a", ".wav")):
     """
     Recursively find all audio files in the given directory with the specified extensions.
     Returns a list of file paths.
@@ -19,3 +21,33 @@ def ensure_directory_exists(directory):
     Create the directory if it does not exist.
     """
     os.makedirs(directory, exist_ok=True)
+
+def convert_wav_to_mp3(wav_path):
+    """
+    Convert a WAV file to MP3 format using pydub if an MP3 version doesn't already exist.
+    Saves the MP3 file in the same directory as the WAV file.
+    
+    Args:
+        wav_path: Path to the WAV file
+        
+    Returns:
+        Path to the MP3 file
+    """
+    # Determine the output MP3 path (same directory, same name, different extension)
+    base_name = os.path.splitext(wav_path)[0]
+    mp3_path = base_name + ".mp3"
+    
+    # Check if MP3 version already exists
+    if os.path.exists(mp3_path):
+        print(f"Using existing MP3 file: {mp3_path}")
+        return mp3_path
+    
+    # Convert WAV to MP3
+    try:
+        audio = AudioSegment.from_wav(wav_path)
+        audio.export(mp3_path, format="mp3")
+        print(f"Converted {wav_path} to MP3 format at {mp3_path}")
+        return mp3_path
+    except Exception as e:
+        print(f"Error converting {wav_path} to MP3: {e}")
+        return None