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diff --git a/dom/media/encoder/TrackMetadataBase.h b/dom/media/encoder/TrackMetadataBase.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* 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 TrackMetadataBase_h_
+#define TrackMetadataBase_h_
+
+#include "nsTArray.h"
+#include "nsCOMPtr.h"
+namespace mozilla {
+
+// A class represent meta data for various codec format. Only support one track
+// information.
+class TrackMetadataBase {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TrackMetadataBase)
+  enum MetadataKind {
+    METADATA_OPUS,  // Represent the Opus metadata
+    METADATA_VP8,
+    METADATA_VORBIS,
+    METADATA_AVC,
+    METADATA_AAC,
+    METADATA_AMR,
+    METADATA_EVRC,
+    METADATA_UNKNOWN  // Metadata Kind not set
+  };
+  // Return the specific metadata kind
+  virtual MetadataKind GetKind() const = 0;
+
+ protected:
+  // Protected destructor, to discourage deletion outside of Release():
+  virtual ~TrackMetadataBase() = default;
+};
+
+// The base class for audio metadata.
+class AudioTrackMetadata : public TrackMetadataBase {
+ public:
+  // The duration of each sample set generated by encoder. (counted by samples)
+  // If the duration is variant, this value should return 0.
+  virtual uint32_t GetAudioFrameDuration() = 0;
+
+  // The size of each sample set generated by encoder. (counted by byte)
+  // If the size is variant, this value should return 0.
+  virtual uint32_t GetAudioFrameSize() = 0;
+
+  // AudioSampleRate is the number of audio sample per second.
+  virtual uint32_t GetAudioSampleRate() = 0;
+
+  virtual uint32_t GetAudioChannels() = 0;
+};
+
+// The base class for video metadata.
+class VideoTrackMetadata : public TrackMetadataBase {
+ public:
+  // VideoHeight and VideoWidth are the frame size of the elementary stream.
+  virtual uint32_t GetVideoHeight() = 0;
+  virtual uint32_t GetVideoWidth() = 0;
+
+  // VideoDisplayHeight and VideoDisplayWidth are the display frame size.
+  virtual uint32_t GetVideoDisplayHeight() = 0;
+  virtual uint32_t GetVideoDisplayWidth() = 0;
+
+  // VideoClockRate is the number of samples per second in video frame's
+  // timestamp.
+  // For example, if VideoClockRate is 90k Hz and VideoFrameRate is
+  // 30 fps, each frame's sample duration will be 3000 Hz.
+  virtual uint32_t GetVideoClockRate() = 0;
+
+  // VideoFrameRate is numner of frames per second.
+  virtual uint32_t GetVideoFrameRate() = 0;
+};
+
+}  // namespace mozilla
+
+#endif