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diff --git a/webrtc/video_decoder.h b/webrtc/video_decoder.h
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+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_VIDEO_DECODER_H_
+#define WEBRTC_VIDEO_DECODER_H_
+
+#include <vector>
+
+#include "webrtc/common_types.h"
+#include "webrtc/typedefs.h"
+#include "webrtc/video_frame.h"
+
+namespace webrtc {
+
+class RTPFragmentationHeader;
+// TODO(pbos): Expose these through a public (root) header or change these APIs.
+struct CodecSpecificInfo;
+struct VideoCodec;
+
+class DecodedImageCallback {
+ public:
+  virtual ~DecodedImageCallback() {}
+
+  virtual int32_t Decoded(VideoFrame& decodedImage) = 0;
+  virtual int32_t ReceivedDecodedReferenceFrame(const uint64_t pictureId) {
+    return -1;
+  }
+
+  virtual int32_t ReceivedDecodedFrame(const uint64_t pictureId) { return -1; }
+};
+
+class VideoDecoder {
+ public:
+  enum DecoderType {
+    kH264,
+    kVp8,
+    kVp9,
+    kUnsupportedCodec,
+  };
+
+  static VideoDecoder* Create(DecoderType codec_type);
+
+  virtual ~VideoDecoder() {}
+
+  virtual int32_t InitDecode(const VideoCodec* codec_settings,
+                             int32_t number_of_cores) = 0;
+
+  virtual int32_t Decode(const EncodedImage& input_image,
+                         bool missing_frames,
+                         const RTPFragmentationHeader* fragmentation,
+                         const CodecSpecificInfo* codec_specific_info = NULL,
+                         int64_t render_time_ms = -1) = 0;
+
+  virtual int32_t RegisterDecodeCompleteCallback(
+      DecodedImageCallback* callback) = 0;
+
+  virtual int32_t Release() = 0;
+  virtual int32_t Reset() = 0;
+};
+
+// Class used to wrap external VideoDecoders to provide a fallback option on
+// software decoding when a hardware decoder fails to decode a stream due to
+// hardware restrictions, such as max resolution.
+class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
+ public:
+  VideoDecoderSoftwareFallbackWrapper(VideoCodecType codec_type,
+                                      VideoDecoder* decoder);
+
+  int32_t InitDecode(const VideoCodec* codec_settings,
+                     int32_t number_of_cores) override;
+
+  int32_t Decode(const EncodedImage& input_image,
+                 bool missing_frames,
+                 const RTPFragmentationHeader* fragmentation,
+                 const CodecSpecificInfo* codec_specific_info,
+                 int64_t render_time_ms) override;
+
+  int32_t RegisterDecodeCompleteCallback(
+      DecodedImageCallback* callback) override;
+
+  int32_t Release() override;
+  int32_t Reset() override;
+
+ private:
+  bool InitFallbackDecoder();
+
+  const DecoderType decoder_type_;
+  VideoDecoder* const decoder_;
+
+  VideoCodec codec_settings_;
+  int32_t number_of_cores_;
+  rtc::scoped_ptr<VideoDecoder> fallback_decoder_;
+  DecodedImageCallback* callback_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_VIDEO_DECODER_H_