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diff --git a/third_party/libwebrtc/test/testsupport/y4m_frame_generator.h b/third_party/libwebrtc/test/testsupport/y4m_frame_generator.h
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+/*
+ *  Copyright (c) 2023 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 TEST_TESTSUPPORT_Y4M_FRAME_GENERATOR_H_
+#define TEST_TESTSUPPORT_Y4M_FRAME_GENERATOR_H_
+
+#include <cstddef>
+#include <memory>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "api/test/frame_generator_interface.h"
+#include "rtc_base/checks.h"
+#include "test/testsupport/frame_reader.h"
+
+namespace webrtc {
+namespace test {
+
+// Generates frames from a Y4M file. The behaviour when reaching EOF is
+// configurable via RepeatMode.
+class Y4mFrameGenerator : public FrameGeneratorInterface {
+ public:
+  enum class RepeatMode {
+    // Generate frames from the input file, but it stops generating new frames
+    // once EOF is reached.
+    kSingle,
+    // Generate frames from the input file, when EOF is reached it starts from
+    // the beginning.
+    kLoop,
+    // Generate frames from the input file, when EOF is reached it plays frames
+    // backwards from the end to the beginning of the file (and vice versa,
+    // literally doing Ping/Pong between the beginning and the end of the file).
+    kPingPong,
+  };
+  Y4mFrameGenerator(absl::string_view filename, RepeatMode repeat_mode);
+  ~Y4mFrameGenerator() override = default;
+
+  VideoFrameData NextFrame() override;
+
+  void ChangeResolution(size_t width, size_t height) override;
+
+  Resolution GetResolution() const override;
+
+  absl::optional<int> fps() const override { return fps_; }
+
+ private:
+  YuvFrameReaderImpl::RepeatMode ToYuvFrameReaderRepeatMode(
+      RepeatMode repeat_mode) const;
+  std::unique_ptr<webrtc::test::FrameReader> frame_reader_ = nullptr;
+  std::string filename_;
+  size_t width_;
+  size_t height_;
+  int fps_;
+  const RepeatMode repeat_mode_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TESTSUPPORT_Y4M_FRAME_GENERATOR_H_