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diff --git a/dom/media/ipc/RemoteMediaDataDecoder.h b/dom/media/ipc/RemoteMediaDataDecoder.h
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+++ b/dom/media/ipc/RemoteMediaDataDecoder.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 include_dom_media_ipc_RemoteMediaDataDecoder_h
+#define include_dom_media_ipc_RemoteMediaDataDecoder_h
+#include "PlatformDecoderModule.h"
+
+#include "MediaData.h"
+
+namespace mozilla {
+
+class RemoteDecoderChild;
+class RemoteDecoderManagerChild;
+class RemoteMediaDataDecoder;
+
+DDLoggedTypeCustomNameAndBase(RemoteMediaDataDecoder, RemoteMediaDataDecoder,
+                              MediaDataDecoder);
+
+// A MediaDataDecoder implementation that proxies through IPDL
+// to a 'real' decoder in the GPU or RDD process.
+// All requests get forwarded to a *DecoderChild instance that
+// operates solely on the provided manager and abstract manager threads.
+class RemoteMediaDataDecoder final
+    : public MediaDataDecoder,
+      public DecoderDoctorLifeLogger<RemoteMediaDataDecoder> {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(RemoteMediaDataDecoder, final);
+
+  explicit RemoteMediaDataDecoder(RemoteDecoderChild* aChild);
+
+  // MediaDataDecoder
+  RefPtr<InitPromise> Init() override;
+  RefPtr<DecodePromise> Decode(MediaRawData* aSample) override;
+  bool CanDecodeBatch() const override { return true; }
+  RefPtr<DecodePromise> DecodeBatch(
+      nsTArray<RefPtr<MediaRawData>>&& aSamples) override;
+  RefPtr<DecodePromise> Drain() override;
+  RefPtr<FlushPromise> Flush() override;
+  RefPtr<ShutdownPromise> Shutdown() override;
+  bool IsHardwareAccelerated(nsACString& aFailureReason) const override;
+  void SetSeekThreshold(const media::TimeUnit& aTime) override;
+  nsCString GetDescriptionName() const override;
+  nsCString GetProcessName() const override;
+  nsCString GetCodecName() const override;
+  ConversionRequired NeedsConversion() const override;
+
+ private:
+  ~RemoteMediaDataDecoder();
+
+  // Only ever written to from the reader task queue (during the constructor and
+  // destructor when we can guarantee no other threads are accessing it). Only
+  // read from the manager thread.
+  RefPtr<RemoteDecoderChild> mChild;
+  // Only ever written/modified during decoder initialisation.
+  // As such can be accessed from any threads after that.
+  nsCString mDescription = "RemoteMediaDataDecoder"_ns;
+  nsCString mProcessName = "unknown"_ns;
+  nsCString mCodecName = "unknown"_ns;
+  bool mIsHardwareAccelerated = false;
+  nsCString mHardwareAcceleratedReason;
+  ConversionRequired mConversion = ConversionRequired::kNeedNone;
+};
+
+}  // namespace mozilla
+
+#endif  // include_dom_media_ipc_RemoteMediaDataDecoder_h