v0.2 - drop fingerprinting, add LUFS cart normalisation, playlist save/load, editable history with TXT+CSV export

audio_engine.py

@@ -6,8 +6,10 @@ import jack
 import threading
 import subprocess
 import os
+import pyloudnorm as pyln
 
 
+LUFS_TARGET = -14.0
 SOUNDFILE_FORMATS = {'.wav', '.flac', '.ogg', '.aiff', '.aif'}
 FFMPEG_FORMATS    = {'.mp3', '.m4a', '.mp4', '.opus', '.aac', '.wma'}
 
@@ -52,6 +54,18 @@ def load_audio(filepath: str, target_sr: int) -> np.ndarray:
     return data
 
 
+def normalize_lufs(audio: np.ndarray, sr: int,
+                   target: float = LUFS_TARGET) -> np.ndarray:
+    meter = pyln.Meter(sr)
+    loudness = meter.integrated_loudness(audio.T)
+    if np.isinf(loudness):
+        return audio
+    gain_db = target - loudness
+    gain_linear = 10 ** (gain_db / 20.0)
+    normalized = audio * gain_linear
+    return np.clip(normalized, -1.0, 1.0)
+
+
 class Track:
     def __init__(self, filepath: str, audio: np.ndarray, sr: int):
         self.filepath    = filepath
@@ -260,6 +274,14 @@ class AudioEngine:
             self.decks[deck_key].load(track)
         threading.Thread(target=_load, daemon=True).start()
 
+    def load_cart_track(self, cart_key: str, filepath: str):
+        def _load():
+            audio = load_audio(filepath, self.sr)
+            audio = normalize_lufs(audio, self.sr)
+            track = Track(filepath, audio, self.sr)
+            self.decks[cart_key].load(track)
+        threading.Thread(target=_load, daemon=True).start()
+
     def load_queue(self, deck_key: str, filepath: str):
         def _load():
             audio = load_audio(filepath, self.sr)