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diff --git a/third_party/libwebrtc/common_audio/fir_filter.h b/third_party/libwebrtc/common_audio/fir_filter.h
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+++ b/third_party/libwebrtc/common_audio/fir_filter.h
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+/*
+ *  Copyright (c) 2014 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_FIR_FILTER_H_
+#define COMMON_AUDIO_FIR_FILTER_H_
+
+#include <string.h>
+
+namespace webrtc {
+
+// Finite Impulse Response filter using floating-point arithmetic.
+class FIRFilter {
+ public:
+  virtual ~FIRFilter() {}
+
+  // Filters the `in` data supplied.
+  // `out` must be previously allocated and it must be at least of `length`.
+  virtual void Filter(const float* in, size_t length, float* out) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_H_