From b819fc816b08954ecccdb8d3bdb2250045e26fed Mon Sep 17 00:00:00 2001
From: Tamius Han <tamius.han@gmail.com>
Date: Wed, 13 Jan 2021 01:12:03 +0100
Subject: [PATCH] Fix DRM detection for Chrome

---
 src/ext/lib/ar-detect/ArDetector.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ext/lib/ar-detect/ArDetector.js b/src/ext/lib/ar-detect/ArDetector.js
index d5ed0e0..ad8f058 100644
--- a/src/ext/lib/ar-detect/ArDetector.js
+++ b/src/ext/lib/ar-detect/ArDetector.js
@@ -526,6 +526,13 @@ class ArDetector {
    * completely opaque (i.e. have value of 255))
    */
   hasDRM() {
+    // oh btw, there's one exception. There is this brief period between the point
+    // when metadata (video dimensions) have loaded and the moment the video starts
+    // playing where ctx.drawImage() will draw a transparent black square regardless
+    // of whether the video is actually DRM-protected or not.
+    if (! this.conf.hasVideoStartedPlaying()) {
+      return false;
+    }
     return this.blackframeContext.getImageData(0,0,1,1).data[3] === 0;
   }