From b301fb43900671727f899d0bdec2d0914857d76e Mon Sep 17 00:00:00 2001
From: rlaphoenix <rlaphoenix@pm.me>
Date: Tue, 28 Mar 2023 20:25:30 +0100
Subject: [PATCH] Use tenc boxes within uuid boxes as another fallback for
 get_key_id

---
 devine/core/tracks/track.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/devine/core/tracks/track.py b/devine/core/tracks/track.py
index e0b5298..62f618e 100644
--- a/devine/core/tracks/track.py
+++ b/devine/core/tracks/track.py
@@ -124,6 +124,13 @@ class Track:
             if tenc.key_ID.int != 0:
                 return tenc.key_ID
 
+        # look for UUID mp4 boxes holding track encryption mp4 boxes
+        for uuid_box in get_boxes(init_data, b"uuid"):
+            if uuid_box.extended_type == UUID("8974dbce-7be7-4c51-84f9-7148f9882554"):
+                tenc = uuid_box.data
+                if tenc.key_ID.int != 0:
+                    return tenc.key_ID
+
     def get_init_segment(
         self,
         maximum_size: int = 20000,