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diff --git a/third_party/aom/test/y4m_video_source.h b/third_party/aom/test/y4m_video_source.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+#ifndef AOM_TEST_Y4M_VIDEO_SOURCE_H_
+#define AOM_TEST_Y4M_VIDEO_SOURCE_H_
+#include <algorithm>
+#include <string>
+
+#include "common/y4minput.h"
+#include "test/video_source.h"
+
+namespace libaom_test {
+
+// This class extends VideoSource to allow parsing of raw yv12
+// so that we can do actual file encodes.
+class Y4mVideoSource : public VideoSource {
+ public:
+  Y4mVideoSource(const std::string &file_name, unsigned int start, int limit)
+      : file_name_(file_name), input_file_(NULL), img_(new aom_image_t()),
+        start_(start), limit_(limit), frame_(0), framerate_numerator_(0),
+        framerate_denominator_(0), y4m_() {}
+
+  virtual ~Y4mVideoSource() {
+    aom_img_free(img_.get());
+    CloseSource();
+  }
+
+  virtual void OpenSource() {
+    CloseSource();
+    input_file_ = OpenTestDataFile(file_name_);
+    ASSERT_TRUE(input_file_ != NULL)
+        << "Input file open failed. Filename: " << file_name_;
+  }
+
+  virtual void ReadSourceToStart() {
+    ASSERT_TRUE(input_file_ != NULL);
+    ASSERT_FALSE(y4m_input_open(&y4m_, input_file_, NULL, 0, 0));
+    framerate_numerator_ = y4m_.fps_n;
+    framerate_denominator_ = y4m_.fps_d;
+    frame_ = 0;
+    for (unsigned int i = 0; i < start_; i++) {
+      Next();
+    }
+    FillFrame();
+  }
+
+  virtual void Begin() {
+    OpenSource();
+    ReadSourceToStart();
+  }
+
+  virtual void Next() {
+    ++frame_;
+    FillFrame();
+  }
+
+  virtual aom_image_t *img() const {
+    return (frame_ < limit_) ? img_.get() : NULL;
+  }
+
+  // Models a stream where Timebase = 1/FPS, so pts == frame.
+  virtual aom_codec_pts_t pts() const { return frame_; }
+
+  virtual unsigned long duration() const { return 1; }
+
+  virtual aom_rational_t timebase() const {
+    const aom_rational_t t = { framerate_denominator_, framerate_numerator_ };
+    return t;
+  }
+
+  virtual unsigned int frame() const { return frame_; }
+
+  virtual unsigned int limit() const { return limit_; }
+
+  virtual void FillFrame() {
+    ASSERT_TRUE(input_file_ != NULL);
+    // Read a frame from input_file.
+    y4m_input_fetch_frame(&y4m_, input_file_, img_.get());
+  }
+
+  // Swap buffers with another y4m source. This allows reading a new frame
+  // while keeping the old frame around. A whole Y4mSource is required and
+  // not just a aom_image_t because of how the y4m reader manipulates
+  // aom_image_t internals,
+  void SwapBuffers(Y4mVideoSource *other) {
+    std::swap(other->y4m_.dst_buf, y4m_.dst_buf);
+    aom_image_t *tmp;
+    tmp = other->img_.release();
+    other->img_.reset(img_.release());
+    img_.reset(tmp);
+  }
+
+ protected:
+  void CloseSource() {
+    y4m_input_close(&y4m_);
+    y4m_ = y4m_input();
+    if (input_file_ != NULL) {
+      fclose(input_file_);
+      input_file_ = NULL;
+    }
+  }
+
+  std::string file_name_;
+  FILE *input_file_;
+  testing::internal::scoped_ptr<aom_image_t> img_;
+  unsigned int start_;
+  unsigned int limit_;
+  unsigned int frame_;
+  int framerate_numerator_;
+  int framerate_denominator_;
+  y4m_input y4m_;
+};
+
+}  // namespace libaom_test
+
+#endif  // AOM_TEST_Y4M_VIDEO_SOURCE_H_