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diff --git a/dom/media/fmp4/MP4Decoder.h b/dom/media/fmp4/MP4Decoder.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+#if !defined(MP4Decoder_h_)
+#define MP4Decoder_h_
+
+#include "MediaDecoder.h"
+#include "MediaFormatReader.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/layers/KnowsCompositor.h"
+
+namespace mozilla {
+
+class MediaContentType;
+
+// Decoder that uses a bundled MP4 demuxer and platform decoders to play MP4.
+class MP4Decoder : public MediaDecoder
+{
+public:
+ explicit MP4Decoder(MediaDecoderOwner* aOwner);
+
+ MediaDecoder* Clone(MediaDecoderOwner* aOwner) override {
+ if (!IsEnabled()) {
+ return nullptr;
+ }
+ return new MP4Decoder(aOwner);
+ }
+
+ MediaDecoderStateMachine* CreateStateMachine() override;
+
+ // Returns true if aType is a type that we think we can render with the
+ // a MP4 platform decoder backend.
+ static bool CanHandleMediaType(const MediaContentType& aType,
+ DecoderDoctorDiagnostics* aDiagnostics);
+
+ // Return true if aMimeType is a one of the strings used by our demuxers to
+ // identify H264. Does not parse general content type strings, i.e. white
+ // space matters.
+ static bool IsH264(const nsACString& aMimeType);
+
+ // Return true if aMimeType is a one of the strings used by our demuxers to
+ // identify AAC. Does not parse general content type strings, i.e. white
+ // space matters.
+ static bool IsAAC(const nsACString& aMimeType);
+
+ // Returns true if the MP4 backend is preffed on.
+ static bool IsEnabled();
+
+ static already_AddRefed<dom::Promise>
+ IsVideoAccelerated(layers::KnowsCompositor* aKnowsCompositor, nsIGlobalObject* aParent);
+
+ void GetMozDebugReaderData(nsAString& aString) override;
+
+private:
+ RefPtr<MediaFormatReader> mReader;
+};
+
+} // namespace mozilla
+
+#endif