Add duplicate audio hash detection

serato_doctor/hashing.py

@@ -0,0 +1,33 @@
+"""Targeted content hashing for duplicate candidates."""
+
+import hashlib
+from pathlib import Path
+from typing import Iterable
+
+
+def sha256_file(path: Path, chunk_size: int = 1024 * 1024) -> str:
+    digest = hashlib.sha256()
+    with path.open("rb") as source:
+        for chunk in iter(lambda: source.read(chunk_size), b""):
+            digest.update(chunk)
+    return digest.hexdigest()
+
+
+def compare_audio_files(paths: Iterable[Path]) -> dict:
+    paths = tuple(paths)
+    if len(paths) < 2:
+        raise ValueError("At least two files are required for comparison")
+    fingerprints = []
+    for path in paths:
+        fingerprints.append(
+            {
+                "path": str(path),
+                "size": path.stat().st_size,
+                "sha256": sha256_file(path),
+            }
+        )
+    identical = len({item["sha256"] for item in fingerprints}) == 1
+    return {
+        "status": "identical" if identical else "different",
+        "files": fingerprints,
+    }