From efbdf623dc19bf9902bbb5840384e25e31465e50 Mon Sep 17 00:00:00 2001
From: Alexandre Lissy <lissyx+mozillians@lissyx.dyndns.org>
Date: Thu, 6 Oct 2022 06:14:10 +0000
Subject: [PATCH] Bug 1788596 - Force audio element load to avoid edge case on
 media error handling r=alwu

Differential Revision: https://phabricator.services.mozilla.com/D158076
---
 ipc/glue/test/browser/head.js | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/ipc/glue/test/browser/head.js b/ipc/glue/test/browser/head.js
index e54b662906b0..828d919df2f8 100644
--- a/ipc/glue/test/browser/head.js
+++ b/ipc/glue/test/browser/head.js
@@ -186,16 +186,26 @@ async function checkAudioDecoder(
       }
     };
 
-    audio.addEventListener("timeupdate", timeUpdateHandler, { once: true });
+    const startPlaybackHandler = async ev => {
+      ok(
+        await audio.play().then(
+          _ => true,
+          _ => false
+        ),
+        "audio started playing"
+      );
+
+      audio.addEventListener("timeupdate", timeUpdateHandler, { once: true });
+    };
+
+    audio.addEventListener("canplaythrough", startPlaybackHandler, {
+      once: true,
+    });
   });
 
-  ok(
-    await audio.play().then(
-      _ => true,
-      _ => false
-    ),
-    "audio started playing"
-  );
+  // We need to make sure the decoder is ready before play()ing otherwise we
+  // could get into bad situations
+  audio.load();
   return checkPromise;
 }