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diff --git a/dom/media/platforms/wrappers/H264Converter.h b/dom/media/platforms/wrappers/H264Converter.h
new file mode 100644
index 000000000..6905b1c74
--- /dev/null
+++ b/dom/media/platforms/wrappers/H264Converter.h
@@ -0,0 +1,74 @@
+/* -*- 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_H264Converter_h
+#define mozilla_H264Converter_h
+
+#include "PlatformDecoderModule.h"
+
+namespace mozilla {
+
+// H264Converter is a MediaDataDecoder wrapper used to ensure that
+// only AVCC or AnnexB is fed to the underlying MediaDataDecoder.
+// The H264Converter allows playback of content where the SPS NAL may not be
+// provided in the init segment (e.g. AVC3 or Annex B)
+// H264Converter will monitor the input data, and will delay creation of the
+// MediaDataDecoder until a SPS and PPS NALs have been extracted.
+
+class H264Converter : public MediaDataDecoder {
+public:
+
+  H264Converter(PlatformDecoderModule* aPDM,
+                const CreateDecoderParams& aParams);
+  virtual ~H264Converter();
+
+  RefPtr<InitPromise> Init() override;
+  void Input(MediaRawData* aSample) override;
+  void Flush() override;
+  void Drain() override;
+  void Shutdown() override;
+  bool IsHardwareAccelerated(nsACString& aFailureReason) const override;
+  const char* GetDescriptionName() const override
+  {
+    if (mDecoder) {
+      return mDecoder->GetDescriptionName();
+    }
+    return "H264Converter decoder (pending)";
+  }
+  void SetSeekThreshold(const media::TimeUnit& aTime) override;
+
+  nsresult GetLastError() const { return mLastError; }
+
+private:
+  // Will create the required MediaDataDecoder if need AVCC and we have a SPS NAL.
+  // Returns NS_ERROR_FAILURE if error is permanent and can't be recovered and
+  // will set mError accordingly.
+  nsresult CreateDecoder(DecoderDoctorDiagnostics* aDiagnostics);
+  nsresult CreateDecoderAndInit(MediaRawData* aSample);
+  nsresult CheckForSPSChange(MediaRawData* aSample);
+  void UpdateConfigFromExtraData(MediaByteBuffer* aExtraData);
+
+  void OnDecoderInitDone(const TrackType aTrackType);
+  void OnDecoderInitFailed(MediaResult aError);
+
+  RefPtr<PlatformDecoderModule> mPDM;
+  VideoInfo mCurrentConfig;
+  RefPtr<layers::KnowsCompositor> mKnowsCompositor;
+  RefPtr<layers::ImageContainer> mImageContainer;
+  const RefPtr<TaskQueue> mTaskQueue;
+  nsTArray<RefPtr<MediaRawData>> mMediaRawSamples;
+  MediaDataDecoderCallback* mCallback;
+  RefPtr<MediaDataDecoder> mDecoder;
+  MozPromiseRequestHolder<InitPromise> mInitPromiseRequest;
+  RefPtr<GMPCrashHelper> mGMPCrashHelper;
+  bool mNeedAVCC;
+  nsresult mLastError;
+  bool mNeedKeyframe = true;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_H264Converter_h