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diff --git a/dom/media/ADTSDemuxer.h b/dom/media/ADTSDemuxer.h
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+++ b/dom/media/ADTSDemuxer.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 ADTS_DEMUXER_H_
+#define ADTS_DEMUXER_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Maybe.h"
+#include "MediaDataDemuxer.h"
+#include "MediaResource.h"
+#include "mp4_demuxer/ByteReader.h"
+
+namespace mozilla {
+
+namespace adts {
+class Frame;
+class FrameParser;
+}
+
+class ADTSTrackDemuxer;
+
+class ADTSDemuxer : public MediaDataDemuxer {
+public:
+  // MediaDataDemuxer interface.
+  explicit ADTSDemuxer(MediaResource* aSource);
+  RefPtr<InitPromise> Init() override;
+  bool HasTrackType(TrackInfo::TrackType aType) const override;
+  uint32_t GetNumberTracks(TrackInfo::TrackType aType) const override;
+  already_AddRefed<MediaTrackDemuxer> GetTrackDemuxer(
+    TrackInfo::TrackType aType, uint32_t aTrackNumber) override;
+  bool IsSeekable() const override;
+
+private:
+  bool InitInternal();
+
+  RefPtr<MediaResource> mSource;
+  RefPtr<ADTSTrackDemuxer> mTrackDemuxer;
+};
+
+class ADTSTrackDemuxer : public MediaTrackDemuxer {
+public:
+  explicit ADTSTrackDemuxer(MediaResource* aSource);
+
+  // Initializes the track demuxer by reading the first frame for meta data.
+  // Returns initialization success state.
+  bool Init();
+
+  // Returns the total stream length if known, -1 otherwise.
+  int64_t StreamLength() const;
+
+  // Returns the estimated stream duration, or a 0-duration if unknown.
+  media::TimeUnit Duration() const;
+
+  // Returns the estimated duration up to the given frame number,
+  // or a 0-duration if unknown.
+  media::TimeUnit Duration(int64_t aNumFrames) const;
+
+  // MediaTrackDemuxer interface.
+  UniquePtr<TrackInfo> GetInfo() const override;
+  RefPtr<SeekPromise> Seek(media::TimeUnit aTime) override;
+  RefPtr<SamplesPromise> GetSamples(int32_t aNumSamples = 1) override;
+  void Reset() override;
+  RefPtr<SkipAccessPointPromise> SkipToNextRandomAccessPoint(
+    media::TimeUnit aTimeThreshold) override;
+  int64_t GetResourceOffset() const override;
+  media::TimeIntervals GetBuffered() override;
+
+private:
+  // Destructor.
+  ~ADTSTrackDemuxer();
+
+  // Fast approximate seeking to given time.
+  media::TimeUnit FastSeek(const media::TimeUnit& aTime);
+
+  // Seeks by scanning the stream up to the given time for more accurate results.
+  media::TimeUnit ScanUntil(const media::TimeUnit& aTime);
+
+  // Finds the next valid frame and returns its byte range.
+  const adts::Frame& FindNextFrame(bool findFirstFrame = false);
+
+  // Skips the next frame given the provided byte range.
+  bool SkipNextFrame(const adts::Frame& aFrame);
+
+  // Returns the next ADTS frame, if available.
+  already_AddRefed<MediaRawData> GetNextFrame(const adts::Frame& aFrame);
+
+  // Updates post-read meta data.
+  void UpdateState(const adts::Frame& aFrame);
+
+  // Returns the frame index for the given offset.
+  int64_t FrameIndexFromOffset(int64_t aOffset) const;
+
+  // Returns the frame index for the given time.
+  int64_t FrameIndexFromTime(const media::TimeUnit& aTime) const;
+
+  // Reads aSize bytes into aBuffer from the source starting at aOffset.
+  // Returns the actual size read.
+  int32_t Read(uint8_t* aBuffer, int64_t aOffset, int32_t aSize);
+
+  // Returns the average frame length derived from the previously parsed frames.
+  double AverageFrameLength() const;
+
+  // The (hopefully) ADTS resource.
+  MediaResourceIndex mSource;
+
+  // ADTS frame parser used to detect frames and extract side info.
+  adts::FrameParser* mParser;
+
+  // Current byte offset in the source stream.
+  int64_t mOffset;
+
+  // Total parsed frames.
+  uint64_t mNumParsedFrames;
+
+  // Current frame index.
+  int64_t mFrameIndex;
+
+  // Sum of parsed frames' lengths in bytes.
+  uint64_t mTotalFrameLen;
+
+  // Samples per frame metric derived from frame headers or 0 if none available.
+  uint32_t mSamplesPerFrame;
+
+  // Samples per second metric derived from frame headers or 0 if none available.
+  uint32_t mSamplesPerSecond;
+
+  // Channel count derived from frame headers or 0 if none available.
+  uint32_t mChannels;
+
+  // Audio track config info.
+  UniquePtr<AudioInfo> mInfo;
+};
+
+} // mozilla
+
+#endif // !ADTS_DEMUXER_H_