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diff --git a/dom/media/ReaderProxy.h b/dom/media/ReaderProxy.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 ReaderProxy_h_
+#define ReaderProxy_h_
+
+#include "mozilla/AbstractThread.h"
+#include "mozilla/RefPtr.h"
+#include "nsISupportsImpl.h"
+
+#include "MediaEventSource.h"
+#include "MediaFormatReader.h"
+#include "MediaPromiseDefs.h"
+
+namespace mozilla {
+
+/**
+ * A wrapper around MediaFormatReader to offset the timestamps of Audio/Video
+ * samples by the start time to ensure MDSM can always assume zero start time.
+ * It also adjusts the seek target passed to Seek() to ensure correct seek time
+ * is passed to the underlying reader.
+ */
+class ReaderProxy {
+  using MetadataPromise = MediaFormatReader::MetadataPromise;
+  using AudioDataPromise = MediaFormatReader::AudioDataPromise;
+  using VideoDataPromise = MediaFormatReader::VideoDataPromise;
+  using SeekPromise = MediaFormatReader::SeekPromise;
+  using WaitForDataPromise = MediaFormatReader::WaitForDataPromise;
+  using TrackSet = MediaFormatReader::TrackSet;
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ReaderProxy);
+
+ public:
+  ReaderProxy(AbstractThread* aOwnerThread, MediaFormatReader* aReader);
+
+  media::TimeUnit StartTime() const;
+  RefPtr<MetadataPromise> ReadMetadata();
+
+  RefPtr<AudioDataPromise> RequestAudioData();
+
+  RefPtr<VideoDataPromise> RequestVideoData(
+      const media::TimeUnit& aTimeThreshold, bool aRequestNextVideoKeyFrame);
+
+  RefPtr<WaitForDataPromise> WaitForData(MediaData::Type aType);
+
+  RefPtr<SeekPromise> Seek(const SeekTarget& aTarget);
+  RefPtr<ShutdownPromise> Shutdown();
+
+  void ReleaseResources();
+  void ResetDecode(TrackSet aTracks);
+
+  nsresult Init() { return mReader->Init(); }
+  bool UseBufferingHeuristics() const {
+    return mReader->UseBufferingHeuristics();
+  }
+
+  bool VideoIsHardwareAccelerated() const {
+    return mReader->VideoIsHardwareAccelerated();
+  }
+  TimedMetadataEventSource& TimedMetadataEvent() {
+    return mReader->TimedMetadataEvent();
+  }
+  MediaEventSource<void>& OnMediaNotSeekable() {
+    return mReader->OnMediaNotSeekable();
+  }
+  MediaEventProducer<VideoInfo, AudioInfo>& OnTrackInfoUpdatedEvent() {
+    return mReader->OnTrackInfoUpdatedEvent();
+  }
+  size_t SizeOfAudioQueueInFrames() const {
+    return mReader->SizeOfAudioQueueInFrames();
+  }
+  size_t SizeOfVideoQueueInFrames() const {
+    return mReader->SizeOfVideoQueueInFrames();
+  }
+  void ReadUpdatedMetadata(MediaInfo* aInfo) {
+    mReader->ReadUpdatedMetadata(aInfo);
+  }
+  AbstractCanonical<media::TimeIntervals>* CanonicalBuffered() {
+    return mReader->CanonicalBuffered();
+  }
+
+  RefPtr<SetCDMPromise> SetCDMProxy(CDMProxy* aProxy);
+
+  void SetVideoBlankDecode(bool aIsBlankDecode);
+
+  void SetCanonicalDuration(Canonical<media::NullableTimeUnit>& aCanonical);
+
+  void UpdateMediaEngineId(uint64_t aMediaEngineId);
+
+ private:
+  ~ReaderProxy();
+  RefPtr<MetadataPromise> OnMetadataRead(MetadataHolder&& aMetadata);
+  RefPtr<MetadataPromise> OnMetadataNotRead(const MediaResult& aError);
+  void UpdateDuration();
+  RefPtr<SeekPromise> SeekInternal(const SeekTarget& aTarget);
+
+  RefPtr<ReaderProxy::AudioDataPromise> OnAudioDataRequestCompleted(
+      RefPtr<AudioData> aAudio);
+  RefPtr<ReaderProxy::AudioDataPromise> OnAudioDataRequestFailed(
+      const MediaResult& aError);
+
+  const RefPtr<AbstractThread> mOwnerThread;
+  const RefPtr<MediaFormatReader> mReader;
+
+  bool mShutdown = false;
+  Maybe<media::TimeUnit> mStartTime;
+
+  // State-watching manager.
+  WatchManager<ReaderProxy> mWatchManager;
+
+  // Duration, mirrored from the state machine task queue.
+  Mirror<media::NullableTimeUnit> mDuration;
+};
+
+}  // namespace mozilla
+
+#endif  // ReaderProxy_h_