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diff --git a/third_party/aom/test/video_source.h b/third_party/aom/test/video_source.h
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+++ b/third_party/aom/test/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_VIDEO_SOURCE_H_
+#define AOM_TEST_VIDEO_SOURCE_H_
+
+#if defined(_WIN32)
+#undef NOMINMAX
+#define NOMINMAX
+#undef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <memory>
+#include <string>
+
+#include "aom/aom_encoder.h"
+#include "test/acm_random.h"
+#if !defined(_WIN32)
+#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
+#endif
+
+namespace libaom_test {
+
+// Helper macros to ensure LIBAOM_TEST_DATA_PATH is a quoted string.
+// These are undefined right below GetDataPath
+// NOTE: LIBAOM_TEST_DATA_PATH MUST NOT be a quoted string before
+// Stringification or the GetDataPath will fail at runtime
+#define TO_STRING(S) #S
+#define STRINGIFY(S) TO_STRING(S)
+
+// A simple function to encapsulate cross platform retrieval of test data path
+static std::string GetDataPath() {
+  const char *const data_path = getenv("LIBAOM_TEST_DATA_PATH");
+  if (data_path == nullptr) {
+#ifdef LIBAOM_TEST_DATA_PATH
+    // In some environments, we cannot set environment variables
+    // Instead, we set the data path by using a preprocessor symbol
+    // which can be set from make files
+    return STRINGIFY(LIBAOM_TEST_DATA_PATH);
+#else
+    return ".";
+#endif
+  }
+  return data_path;
+}
+
+// Undefining stringification macros because they are not used elsewhere
+#undef TO_STRING
+#undef STRINGIFY
+
+inline FILE *OpenTestDataFile(const std::string &file_name) {
+  const std::string path_to_source = GetDataPath() + "/" + file_name;
+  return fopen(path_to_source.c_str(), "rb");
+}
+
+static FILE *GetTempOutFile(std::string *file_name) {
+  file_name->clear();
+#if defined(_WIN32)
+  char fname[MAX_PATH];
+  char tmppath[MAX_PATH];
+  if (GetTempPathA(MAX_PATH, tmppath)) {
+    // Assume for now that the filename generated is unique per process
+    if (GetTempFileNameA(tmppath, "lvx", 0, fname)) {
+      file_name->assign(fname);
+      return fopen(fname, "wb+");
+    }
+  }
+  return nullptr;
+#else
+  std::string temp_dir = testing::TempDir();
+  if (temp_dir.empty()) return nullptr;
+  // Versions of testing::TempDir() prior to release-1.11.0-214-g5e6a5336 may
+  // use the value of an environment variable without checking for a trailing
+  // path delimiter.
+  if (temp_dir[temp_dir.size() - 1] != '/') temp_dir += '/';
+  const char name_template[] = "libaomtest.XXXXXX";
+  std::unique_ptr<char[]> temp_file_name(
+      new char[temp_dir.size() + sizeof(name_template)]);
+  if (temp_file_name == nullptr) return nullptr;
+  memcpy(temp_file_name.get(), temp_dir.data(), temp_dir.size());
+  memcpy(temp_file_name.get() + temp_dir.size(), name_template,
+         sizeof(name_template));
+  const int fd = mkstemp(temp_file_name.get());
+  if (fd == -1) return nullptr;
+  *file_name = temp_file_name.get();
+  return fdopen(fd, "wb+");
+#endif
+}
+
+class TempOutFile {
+ public:
+  TempOutFile() { file_ = GetTempOutFile(&file_name_); }
+  ~TempOutFile() {
+    CloseFile();
+    if (!file_name_.empty()) {
+      EXPECT_EQ(0, remove(file_name_.c_str()));
+    }
+  }
+  FILE *file() { return file_; }
+  const std::string &file_name() { return file_name_; }
+
+ protected:
+  void CloseFile() {
+    if (file_) {
+      fclose(file_);
+      file_ = nullptr;
+    }
+  }
+  FILE *file_;
+  std::string file_name_;
+};
+
+// Abstract base class for test video sources, which provide a stream of
+// aom_image_t images with associated timestamps and duration.
+class VideoSource {
+ public:
+  virtual ~VideoSource() = default;
+
+  // Prepare the stream for reading, rewind/open as necessary.
+  virtual void Begin() = 0;
+
+  // Advance the cursor to the next frame
+  virtual void Next() = 0;
+
+  // Get the current video frame, or nullptr on End-Of-Stream.
+  virtual aom_image_t *img() const = 0;
+
+  // Get the presentation timestamp of the current frame.
+  virtual aom_codec_pts_t pts() const = 0;
+
+  // Get the current frame's duration
+  virtual unsigned long duration() const = 0;
+
+  // Get the timebase for the stream
+  virtual aom_rational_t timebase() const = 0;
+
+  // Get the current frame counter, starting at 0.
+  virtual unsigned int frame() const = 0;
+
+  // Get the current file limit.
+  virtual unsigned int limit() const = 0;
+};
+
+class DummyVideoSource : public VideoSource {
+ public:
+  DummyVideoSource()
+      : img_(nullptr), limit_(100), width_(80), height_(64),
+        format_(AOM_IMG_FMT_I420) {
+    ReallocImage();
+  }
+
+  ~DummyVideoSource() override { aom_img_free(img_); }
+
+  void Begin() override {
+    frame_ = 0;
+    FillFrame();
+  }
+
+  void Next() override {
+    ++frame_;
+    FillFrame();
+  }
+
+  aom_image_t *img() const override {
+    return (frame_ < limit_) ? img_ : nullptr;
+  }
+
+  // Models a stream where Timebase = 1/FPS, so pts == frame.
+  aom_codec_pts_t pts() const override { return frame_; }
+
+  unsigned long duration() const override { return 1; }
+
+  aom_rational_t timebase() const override {
+    const aom_rational_t t = { 1, 30 };
+    return t;
+  }
+
+  unsigned int frame() const override { return frame_; }
+
+  unsigned int limit() const override { return limit_; }
+
+  void set_limit(unsigned int limit) { limit_ = limit; }
+
+  void SetSize(unsigned int width, unsigned int height) {
+    if (width != width_ || height != height_) {
+      width_ = width;
+      height_ = height;
+      ReallocImage();
+    }
+  }
+
+  void SetImageFormat(aom_img_fmt_t format) {
+    if (format_ != format) {
+      format_ = format;
+      ReallocImage();
+    }
+  }
+
+ protected:
+  virtual void FillFrame() {
+    if (img_) memset(img_->img_data, 0, raw_sz_);
+  }
+
+  void ReallocImage() {
+    aom_img_free(img_);
+    img_ = aom_img_alloc(nullptr, format_, width_, height_, 32);
+    ASSERT_NE(img_, nullptr);
+    raw_sz_ = ((img_->w + 31) & ~31u) * img_->h * img_->bps / 8;
+  }
+
+  aom_image_t *img_;
+  size_t raw_sz_;
+  unsigned int limit_;
+  unsigned int frame_;
+  unsigned int width_;
+  unsigned int height_;
+  aom_img_fmt_t format_;
+};
+
+class RandomVideoSource : public DummyVideoSource {
+ public:
+  RandomVideoSource(int seed = ACMRandom::DeterministicSeed())
+      : rnd_(seed), seed_(seed) {}
+
+  // Reset the RNG to get a matching stream for the second pass
+  void Begin() override {
+    frame_ = 0;
+    rnd_.Reset(seed_);
+    FillFrame();
+  }
+
+ protected:
+  // 15 frames of noise, followed by 15 static frames. Reset to 0 rather
+  // than holding previous frames to encourage keyframes to be thrown.
+  void FillFrame() override {
+    if (img_) {
+      if (frame_ % 30 < 15)
+        for (size_t i = 0; i < raw_sz_; ++i) img_->img_data[i] = rnd_.Rand8();
+      else
+        memset(img_->img_data, 0, raw_sz_);
+    }
+  }
+
+  ACMRandom rnd_;
+  int seed_;
+};
+
+// Abstract base class for test video sources, which provide a stream of
+// decompressed images to the decoder.
+class CompressedVideoSource {
+ public:
+  virtual ~CompressedVideoSource() = default;
+
+  virtual void Init() = 0;
+
+  // Prepare the stream for reading, rewind/open as necessary.
+  virtual void Begin() = 0;
+
+  // Advance the cursor to the next frame
+  virtual void Next() = 0;
+
+  virtual const uint8_t *cxdata() const = 0;
+
+  virtual size_t frame_size() const = 0;
+
+  virtual unsigned int frame_number() const = 0;
+};
+
+}  // namespace libaom_test
+
+#endif  // AOM_TEST_VIDEO_SOURCE_H_