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diff --git a/third_party/libwebrtc/modules/audio_coding/neteq/tools/input_audio_file.h b/third_party/libwebrtc/modules/audio_coding/neteq/tools/input_audio_file.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_CODING_NETEQ_TOOLS_INPUT_AUDIO_FILE_H_
+#define MODULES_AUDIO_CODING_NETEQ_TOOLS_INPUT_AUDIO_FILE_H_
+
+#include <stdio.h>
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+namespace test {
+
+// Class for handling a looping input audio file.
+class InputAudioFile {
+ public:
+  explicit InputAudioFile(absl::string_view file_name, bool loop_at_end = true);
+
+  virtual ~InputAudioFile();
+
+  InputAudioFile(const InputAudioFile&) = delete;
+  InputAudioFile& operator=(const InputAudioFile&) = delete;
+
+  // Reads `samples` elements from source file to `destination`. Returns true
+  // if the read was successful, otherwise false. If the file end is reached,
+  // the file is rewound and reading continues from the beginning.
+  // The output `destination` must have the capacity to hold `samples` elements.
+  virtual bool Read(size_t samples, int16_t* destination);
+
+  // Fast-forwards (`samples` > 0) or -backwards (`samples` < 0) the file by the
+  // indicated number of samples. Just like Read(), Seek() starts over at the
+  // beginning of the file if the end is reached. However, seeking backwards
+  // past the beginning of the file is not possible.
+  virtual bool Seek(int samples);
+
+  // Creates a multi-channel signal from a mono signal. Each sample is repeated
+  // `channels` times to create an interleaved multi-channel signal where all
+  // channels are identical. The output `destination` must have the capacity to
+  // hold samples * channels elements. Note that `source` and `destination` can
+  // be the same array (i.e., point to the same address).
+  static void DuplicateInterleaved(const int16_t* source,
+                                   size_t samples,
+                                   size_t channels,
+                                   int16_t* destination);
+
+ private:
+  FILE* fp_;
+  const bool loop_at_end_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+#endif  // MODULES_AUDIO_CODING_NETEQ_TOOLS_INPUT_AUDIO_FILE_H_