1 files changed, 41 insertions, 0 deletions
diff --git a/dom/media/systemservices/OSXRunLoopSingleton.cpp b/dom/media/systemservices/OSXRunLoopSingleton.cpp
new file mode 100644
index 0000000000..6dea084e27
--- /dev/null
+++ b/dom/media/systemservices/OSXRunLoopSingleton.cpp
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "OSXRunLoopSingleton.h"
+#include <mozilla/StaticMutex.h>
+
+#include <AudioUnit/AudioUnit.h>
+#include <CoreAudio/AudioHardware.h>
+#include <CoreAudio/HostTime.h>
+#include <CoreFoundation/CoreFoundation.h>
+
+static bool gRunLoopSet = false;
+static mozilla::StaticMutex gMutex MOZ_UNANNOTATED;
+
+void mozilla_set_coreaudio_notification_runloop_if_needed() {
+  mozilla::StaticMutexAutoLock lock(gMutex);
+  if (gRunLoopSet) {
+    return;
+  }
+
+  /* This is needed so that AudioUnit listeners get called on this thread, and
+   * not the main thread. If we don't do that, they are not called, or a crash
+   * occur, depending on the OSX version. */
+  AudioObjectPropertyAddress runloop_address = {
+      kAudioHardwarePropertyRunLoop, kAudioObjectPropertyScopeGlobal,
+      kAudioObjectPropertyElementMaster};
+
+  CFRunLoopRef run_loop = nullptr;
+
+  OSStatus r;
+  r = AudioObjectSetPropertyData(kAudioObjectSystemObject, &runloop_address, 0,
+                                 NULL, sizeof(CFRunLoopRef), &run_loop);
+  if (r != noErr) {
+    NS_WARNING(
+        "Could not make global CoreAudio notifications use their own thread.");
+  }
+
+  gRunLoopSet = true;
+}