1 files changed, 55 insertions, 0 deletions
diff --git a/dom/media/platforms/wmf/MFMediaEngineNotify.h b/dom/media/platforms/wmf/MFMediaEngineNotify.h
new file mode 100644
index 0000000000..9e42e115c0
--- /dev/null
+++ b/dom/media/platforms/wmf/MFMediaEngineNotify.h
@@ -0,0 +1,55 @@
+/* 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/. */
+
+#ifndef DOM_MEDIA_PLATFORM_WMF_MFMEDIAENGINENOTIFY_H
+#define DOM_MEDIA_PLATFORM_WMF_MFMEDIAENGINENOTIFY_H
+
+#include <wrl.h>
+
+#include "MediaEventSource.h"
+#include "MFMediaEngineExtra.h"
+#include "mozilla/Maybe.h"
+
+namespace mozilla {
+
+const char* MediaEngineEventToStr(MF_MEDIA_ENGINE_EVENT aEvent);
+
+// https://docs.microsoft.com/en-us/windows/win32/api/mfmediaengine/ne-mfmediaengine-mf_media_engine_event
+struct MFMediaEngineEventWrapper final {
+  explicit MFMediaEngineEventWrapper(MF_MEDIA_ENGINE_EVENT aEvent)
+      : mEvent(aEvent) {}
+  MF_MEDIA_ENGINE_EVENT mEvent;
+  Maybe<DWORD_PTR> mParam1;
+  Maybe<DWORD> mParam2;
+};
+
+/**
+ * MFMediaEngineNotify is used to handle the event sent from the media engine.
+ * https://docs.microsoft.com/en-us/windows/win32/api/mfmediaengine/nn-mfmediaengine-imfmediaenginenotify
+ */
+class MFMediaEngineNotify final
+    : public Microsoft::WRL::RuntimeClass<
+          Microsoft::WRL::RuntimeClassFlags<
+              Microsoft::WRL::RuntimeClassType::ClassicCom>,
+          IMFMediaEngineNotify> {
+ public:
+  MFMediaEngineNotify() = default;
+
+  HRESULT RuntimeClassInitialize() { return S_OK; }
+
+  // Method for IMFMediaEngineNotify
+  IFACEMETHODIMP EventNotify(DWORD aEvent, DWORD_PTR aParam1,
+                             DWORD aParam2) override;
+
+  MediaEventSource<MFMediaEngineEventWrapper>& MediaEngineEvent() {
+    return mEngineEvents;
+  }
+
+ private:
+  MediaEventProducer<MFMediaEngineEventWrapper> mEngineEvents;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_MEDIA_PLATFORM_WMF_MFMEDIAENGINENOTIFY_H