Added a way for aduio correlation

cc_audio.py

@@ -0,0 +1,76 @@
+from pathlib import Path
+import subprocess
+import numpy as np
+from scipy.signal import correlate
+import tempfile
+import soundfile as sf
+import matplotlib.pyplot as plt
+
+def extract_audio(file: Path, duration: float):
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+
+    subprocess.run([
+        "ffmpeg",
+        "-y",
+        "-i", str(file),
+        "-map", "0:a:0",        # first audio stream
+        "-ac", "1",             # mono
+        "-ar", "44100",         # fixed sample rate
+        "-t", str(duration),    # limit duration
+        tmp.name
+    ], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+    data, sr = sf.read(tmp.name)
+    return data, sr
+
+
+def get_audio_offset(file1: Path, file2: Path, important_time: float):
+    sig1, sr1 = extract_audio(file1, important_time)
+    sig2, sr2 = extract_audio(file2, important_time)
+
+    if sr1 != sr2:
+        raise ValueError("Sample rates do not match")
+
+    # normalize signals
+    sig1 = sig1 - np.mean(sig1)
+    sig2 = sig2 - np.mean(sig2)
+
+    corr = correlate(sig1, sig2, mode="full")
+    lag = np.argmax(corr) - (len(sig2) - 1)
+
+    offset_seconds = lag / sr1
+    return offset_seconds
+
+def view_audio_correlation(file1: Path, file2: Path, important_time: float):
+    sig1, sr1 = extract_audio(file1, important_time)
+    sig2, sr2 = extract_audio(file2, important_time)
+
+    if sr1 != sr2:
+        raise ValueError("Sample rates differ")
+
+    sig1 = sig1 - np.mean(sig1)
+    sig2 = sig2 - np.mean(sig2)
+
+    corr = correlate(sig1, sig2, mode="full")
+
+    lags = np.arange(-len(sig2)+1, len(sig1))
+    lag_seconds = lags / sr1
+
+    offset_index = np.argmax(corr)
+    offset_seconds = lag_seconds[offset_index]
+
+    plt.figure(figsize=(10,5))
+    plt.plot(lag_seconds, corr)
+    plt.axvline(offset_seconds, linestyle="--")
+    plt.title(f"Audio Cross-Correlation (offset ≈ {offset_seconds:.3f}s)")
+    plt.xlabel("Lag (seconds)")
+    plt.ylabel("Correlation")
+    plt.show()
+
+    return offset_seconds
+
+ger = "/home/honney/mount/Media/tmp/serien/Maid Sama All/Maid Sama/S01/07.mkv"
+jap = "/home/honney/mount/Media/tmp/serien/Maid Sama All/Kaichou wa Maid-sama!/S01/07.mkv"
+
+offset = view_audio_correlation(Path(ger), Path(jap), 90)
+print(offset)