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diff --git a/dom/media/platforms/apple/AppleVTDecoder.h b/dom/media/platforms/apple/AppleVTDecoder.h
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+++ b/dom/media/platforms/apple/AppleVTDecoder.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/. */
+
+#ifndef mozilla_AppleVTDecoder_h
+#define mozilla_AppleVTDecoder_h
+
+#include <CoreFoundation/CFDictionary.h>  // For CFDictionaryRef
+#include <CoreMedia/CoreMedia.h>          // For CMVideoFormatDescriptionRef
+#include <VideoToolbox/VideoToolbox.h>    // For VTDecompressionSessionRef
+
+#include "AppleDecoderModule.h"
+#include "PerformanceRecorder.h"
+#include "PlatformDecoderModule.h"
+#include "ReorderQueue.h"
+#include "TimeUnits.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/ProfilerUtils.h"
+
+namespace mozilla {
+
+DDLoggedTypeDeclNameAndBase(AppleVTDecoder, MediaDataDecoder);
+
+class AppleVTDecoder : public MediaDataDecoder,
+                       public DecoderDoctorLifeLogger<AppleVTDecoder> {
+ public:
+  AppleVTDecoder(const VideoInfo& aConfig,
+                 layers::ImageContainer* aImageContainer,
+                 CreateDecoderParams::OptionSet aOptions,
+                 layers::KnowsCompositor* aKnowsCompositor,
+                 Maybe<TrackingId> aTrackingId);
+
+  class AppleFrameRef {
+   public:
+    media::TimeUnit decode_timestamp;
+    media::TimeUnit composition_timestamp;
+    media::TimeUnit duration;
+    int64_t byte_offset;
+    bool is_sync_point;
+
+    explicit AppleFrameRef(const MediaRawData& aSample)
+        : decode_timestamp(aSample.mTimecode),
+          composition_timestamp(aSample.mTime),
+          duration(aSample.mDuration),
+          byte_offset(aSample.mOffset),
+          is_sync_point(aSample.mKeyframe) {}
+  };
+
+  RefPtr<InitPromise> Init() override;
+  RefPtr<DecodePromise> Decode(MediaRawData* aSample) override;
+  RefPtr<DecodePromise> Drain() override;
+  RefPtr<FlushPromise> Flush() override;
+  RefPtr<ShutdownPromise> Shutdown() override;
+  void SetSeekThreshold(const media::TimeUnit& aTime) override;
+
+  bool IsHardwareAccelerated(nsACString& aFailureReason) const override {
+    return mIsHardwareAccelerated;
+  }
+
+  nsCString GetDescriptionName() const override {
+    return mIsHardwareAccelerated ? "apple hardware VT decoder"_ns
+                                  : "apple software VT decoder"_ns;
+  }
+
+  ConversionRequired NeedsConversion() const override {
+    return ConversionRequired::kNeedAVCC;
+  }
+
+  // Access from the taskqueue and the decoder's thread.
+  // OutputFrame is thread-safe.
+  void OutputFrame(CVPixelBufferRef aImage, AppleFrameRef aFrameRef);
+  void OnDecodeError(OSStatus aError);
+
+ private:
+  friend class AppleDecoderModule;  // To access InitializeSession.
+  virtual ~AppleVTDecoder();
+  RefPtr<FlushPromise> ProcessFlush();
+  RefPtr<DecodePromise> ProcessDrain();
+  void ProcessShutdown();
+  void ProcessDecode(MediaRawData* aSample);
+  void MaybeResolveBufferedFrames();
+
+  void MaybeRegisterCallbackThread();
+
+  void AssertOnTaskQueue() { MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn()); }
+
+  AppleFrameRef* CreateAppleFrameRef(const MediaRawData* aSample);
+  CFDictionaryRef CreateOutputConfiguration();
+
+  const RefPtr<MediaByteBuffer> mExtraData;
+  const uint32_t mPictureWidth;
+  const uint32_t mPictureHeight;
+  const uint32_t mDisplayWidth;
+  const uint32_t mDisplayHeight;
+  const gfx::YUVColorSpace mColorSpace;
+  const gfx::ColorSpace2 mColorPrimaries;
+  const gfx::TransferFunction mTransferFunction;
+  const gfx::ColorRange mColorRange;
+  const gfx::ColorDepth mColorDepth;
+
+  // Method to set up the decompression session.
+  MediaResult InitializeSession();
+  nsresult WaitForAsynchronousFrames();
+  CFDictionaryRef CreateDecoderSpecification();
+  CFDictionaryRef CreateDecoderExtensions();
+
+  enum class StreamType { Unknown, H264, VP9 };
+  const StreamType mStreamType;
+  const RefPtr<TaskQueue> mTaskQueue;
+  const uint32_t mMaxRefFrames;
+  const RefPtr<layers::ImageContainer> mImageContainer;
+  const RefPtr<layers::KnowsCompositor> mKnowsCompositor;
+  const bool mUseSoftwareImages;
+  const Maybe<TrackingId> mTrackingId;
+
+  // Set on reader/decode thread calling Flush() to indicate that output is
+  // not required and so input samples on mTaskQueue need not be processed.
+  Atomic<bool> mIsFlushing;
+  std::atomic<ProfilerThreadId> mCallbackThreadId;
+  // Protects mReorderQueue and mPromise.
+  Monitor mMonitor MOZ_UNANNOTATED;
+  ReorderQueue mReorderQueue;
+  MozMonitoredPromiseHolder<DecodePromise> mPromise;
+
+  // Decoded frame will be dropped if its pts is smaller than this
+  // value. It shold be initialized before Input() or after Flush(). So it is
+  // safe to access it in OutputFrame without protecting.
+  Maybe<media::TimeUnit> mSeekTargetThreshold;
+
+  CMVideoFormatDescriptionRef mFormat;
+  VTDecompressionSessionRef mSession;
+  Atomic<bool> mIsHardwareAccelerated;
+  PerformanceRecorderMulti<DecodeStage> mPerformanceRecorder;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_AppleVTDecoder_h