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diff --git a/third_party/libwebrtc/common_audio/wav_file.h b/third_party/libwebrtc/common_audio/wav_file.h
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+++ b/third_party/libwebrtc/common_audio/wav_file.h
@@ -0,0 +1,115 @@
+/*
+ *  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_WAV_FILE_H_
+#define COMMON_AUDIO_WAV_FILE_H_
+
+#include <stdint.h>
+
+#include <cstddef>
+#include <string>
+
+#include "common_audio/wav_header.h"
+#include "rtc_base/system/file_wrapper.h"
+
+namespace webrtc {
+
+// Interface to provide access WAV file parameters.
+class WavFile {
+ public:
+  enum class SampleFormat { kInt16, kFloat };
+
+  virtual ~WavFile() {}
+
+  virtual int sample_rate() const = 0;
+  virtual size_t num_channels() const = 0;
+  virtual size_t num_samples() const = 0;
+};
+
+// Simple C++ class for writing 16-bit integer and 32 bit floating point PCM WAV
+// files. All error handling is by calls to RTC_CHECK(), making it unsuitable
+// for anything but debug code.
+class WavWriter final : public WavFile {
+ public:
+  // Opens a new WAV file for writing.
+  WavWriter(absl::string_view filename,
+            int sample_rate,
+            size_t num_channels,
+            SampleFormat sample_format = SampleFormat::kInt16);
+  WavWriter(FileWrapper file,
+            int sample_rate,
+            size_t num_channels,
+            SampleFormat sample_format = SampleFormat::kInt16);
+
+  // Closes the WAV file, after writing its header.
+  ~WavWriter() { Close(); }
+
+  WavWriter(const WavWriter&) = delete;
+  WavWriter& operator=(const WavWriter&) = delete;
+
+  // Write additional samples to the file. Each sample is in the range
+  // [-32768.0,32767.0], and there must be the previously specified number of
+  // interleaved channels.
+  void WriteSamples(const float* samples, size_t num_samples);
+  void WriteSamples(const int16_t* samples, size_t num_samples);
+
+  int sample_rate() const override { return sample_rate_; }
+  size_t num_channels() const override { return num_channels_; }
+  size_t num_samples() const override { return num_samples_written_; }
+
+ private:
+  void Close();
+  const int sample_rate_;
+  const size_t num_channels_;
+  size_t num_samples_written_;
+  WavFormat format_;
+  FileWrapper file_;
+};
+
+// Follows the conventions of WavWriter.
+class WavReader final : public WavFile {
+ public:
+  // Opens an existing WAV file for reading.
+  explicit WavReader(absl::string_view filename);
+  explicit WavReader(FileWrapper file);
+
+  // Close the WAV file.
+  ~WavReader() { Close(); }
+
+  WavReader(const WavReader&) = delete;
+  WavReader& operator=(const WavReader&) = delete;
+
+  // Resets position to the beginning of the file.
+  void Reset();
+
+  // Returns the number of samples read. If this is less than requested,
+  // verifies that the end of the file was reached.
+  size_t ReadSamples(size_t num_samples, float* samples);
+  size_t ReadSamples(size_t num_samples, int16_t* samples);
+
+  int sample_rate() const override { return sample_rate_; }
+  size_t num_channels() const override { return num_channels_; }
+  size_t num_samples() const override { return num_samples_in_file_; }
+
+ private:
+  void Close();
+  int sample_rate_;
+  size_t num_channels_;
+  WavFormat format_;
+  size_t num_samples_in_file_;
+  size_t num_unread_samples_;
+  FileWrapper file_;
+  int64_t
+      data_start_pos_;  // Position in the file immediately after WAV header.
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_WAV_FILE_H_