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diff --git a/third_party/libwebrtc/modules/audio_coding/test/TestRedFec.h b/third_party/libwebrtc/modules/audio_coding/test/TestRedFec.h
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+++ b/third_party/libwebrtc/modules/audio_coding/test/TestRedFec.h
@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2011 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_TEST_TESTREDFEC_H_
+#define MODULES_AUDIO_CODING_TEST_TESTREDFEC_H_
+
+#include <memory>
+#include <string>
+
+#include "api/audio_codecs/audio_decoder_factory.h"
+#include "api/audio_codecs/audio_encoder_factory.h"
+#include "common_audio/vad/include/vad.h"
+#include "modules/audio_coding/test/Channel.h"
+#include "modules/audio_coding/test/PCMFile.h"
+#include "test/scoped_key_value_config.h"
+
+namespace webrtc {
+
+class TestRedFec {
+ public:
+  explicit TestRedFec();
+  ~TestRedFec();
+
+  void Perform();
+
+ private:
+  void RegisterSendCodec(const std::unique_ptr<AudioCodingModule>& acm,
+                         const SdpAudioFormat& codec_format,
+                         absl::optional<Vad::Aggressiveness> vad_mode,
+                         bool use_red);
+  void Run();
+  void OpenOutFile(int16_t testNumber);
+
+  test::ScopedKeyValueConfig field_trials_;
+  const rtc::scoped_refptr<AudioEncoderFactory> encoder_factory_;
+  const rtc::scoped_refptr<AudioDecoderFactory> decoder_factory_;
+  std::unique_ptr<AudioCodingModule> _acmA;
+  std::unique_ptr<AudioCodingModule> _acmB;
+
+  Channel* _channelA2B;
+
+  PCMFile _inFileA;
+  PCMFile _outFileB;
+  int16_t _testCntr;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_CODING_TEST_TESTREDFEC_H_