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diff --git a/third_party/libwebrtc/common_audio/real_fourier_ooura.h b/third_party/libwebrtc/common_audio/real_fourier_ooura.h
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+++ b/third_party/libwebrtc/common_audio/real_fourier_ooura.h
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+/*
+ *  Copyright (c) 2015 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 COMMON_AUDIO_REAL_FOURIER_OOURA_H_
+#define COMMON_AUDIO_REAL_FOURIER_OOURA_H_
+
+#include <stddef.h>
+
+#include <complex>
+#include <memory>
+
+#include "common_audio/real_fourier.h"
+
+namespace webrtc {
+
+class RealFourierOoura : public RealFourier {
+ public:
+  explicit RealFourierOoura(int fft_order);
+  ~RealFourierOoura() override;
+
+  void Forward(const float* src, std::complex<float>* dest) const override;
+  void Inverse(const std::complex<float>* src, float* dest) const override;
+
+  int order() const override;
+
+ private:
+  const int order_;
+  const size_t length_;
+  const size_t complex_length_;
+  // These are work arrays for Ooura. The names are based on the comments in
+  // common_audio/third_party/ooura/fft_size_256/fft4g.cc.
+  const std::unique_ptr<size_t[]> work_ip_;
+  const std::unique_ptr<float[]> work_w_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_REAL_FOURIER_OOURA_H_