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diff --git a/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/simulator.h b/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/simulator.h
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+/*
+ *  Copyright (c) 2017 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_TEST_CONVERSATIONAL_SPEECH_SIMULATOR_H_
+#define MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_SIMULATOR_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "absl/strings/string_view.h"
+#include "modules/audio_processing/test/conversational_speech/multiend_call.h"
+
+namespace webrtc {
+namespace test {
+namespace conversational_speech {
+
+struct SpeakerOutputFilePaths {
+  SpeakerOutputFilePaths(absl::string_view new_near_end,
+                         absl::string_view new_far_end)
+      : near_end(new_near_end), far_end(new_far_end) {}
+  // Paths to the near-end and far-end audio track files.
+  const std::string near_end;
+  const std::string far_end;
+};
+
+// Generates the near-end and far-end audio track pairs for each speaker.
+std::unique_ptr<std::map<std::string, SpeakerOutputFilePaths>> Simulate(
+    const MultiEndCall& multiend_call,
+    absl::string_view output_path);
+
+}  // namespace conversational_speech
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_SIMULATOR_H_