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diff --git a/third_party/libwebrtc/modules/audio_device/dummy/file_audio_device_factory.h b/third_party/libwebrtc/modules/audio_device/dummy/file_audio_device_factory.h
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+++ b/third_party/libwebrtc/modules/audio_device/dummy/file_audio_device_factory.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 AUDIO_DEVICE_FILE_AUDIO_DEVICE_FACTORY_H_
+#define AUDIO_DEVICE_FILE_AUDIO_DEVICE_FACTORY_H_
+
+#include <stdint.h>
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+
+class FileAudioDevice;
+
+// This class is used by audio_device_impl.cc when WebRTC is compiled with
+// WEBRTC_DUMMY_FILE_DEVICES. The application must include this file and set the
+// filenames to use before the audio device module is initialized. This is
+// intended for test tools which use the audio device module.
+class FileAudioDeviceFactory {
+ public:
+  static FileAudioDevice* CreateFileAudioDevice();
+
+  // The input file must be a readable 48k stereo raw file. The output
+  // file must be writable. The strings will be copied.
+  static void SetFilenamesToUse(absl::string_view inputAudioFilename,
+                                absl::string_view outputAudioFilename);
+
+ private:
+  enum : uint32_t { MAX_FILENAME_LEN = 512 };
+  static bool _isConfigured;
+  static char _inputAudioFilename[MAX_FILENAME_LEN];
+  static char _outputAudioFilename[MAX_FILENAME_LEN];
+};
+
+}  // namespace webrtc
+
+#endif  // AUDIO_DEVICE_FILE_AUDIO_DEVICE_FACTORY_H_