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diff --git a/third_party/libwebrtc/modules/audio_processing/transient/wpd_node.h b/third_party/libwebrtc/modules/audio_processing/transient/wpd_node.h
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+++ b/third_party/libwebrtc/modules/audio_processing/transient/wpd_node.h
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+/*
+ *  Copyright (c) 2013 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 MODULES_AUDIO_PROCESSING_TRANSIENT_WPD_NODE_H_
+#define MODULES_AUDIO_PROCESSING_TRANSIENT_WPD_NODE_H_
+
+#include <cstddef>
+#include <memory>
+
+namespace webrtc {
+
+class FIRFilter;
+
+// A single node of a Wavelet Packet Decomposition (WPD) tree.
+class WPDNode {
+ public:
+  // Creates a WPDNode. The data vector will contain zeros. The filter will have
+  // the coefficients provided.
+  WPDNode(size_t length, const float* coefficients, size_t coefficients_length);
+  ~WPDNode();
+
+  // Updates the node data. `parent_data` / 2 must be equals to `length_`.
+  // Returns 0 if correct, and -1 otherwise.
+  int Update(const float* parent_data, size_t parent_data_length);
+
+  const float* data() const { return data_.get(); }
+  // Returns 0 if correct, and -1 otherwise.
+  int set_data(const float* new_data, size_t length);
+  size_t length() const { return length_; }
+
+ private:
+  std::unique_ptr<float[]> data_;
+  size_t length_;
+  std::unique_ptr<FIRFilter> filter_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TRANSIENT_WPD_NODE_H_