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diff --git a/third_party/libwebrtc/test/pc/e2e/peer_params_preprocessor.h b/third_party/libwebrtc/test/pc/e2e/peer_params_preprocessor.h
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+++ b/third_party/libwebrtc/test/pc/e2e/peer_params_preprocessor.h
@@ -0,0 +1,52 @@
+/*
+ *  Copyright (c) 2022 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 TEST_PC_E2E_PEER_PARAMS_PREPROCESSOR_H_
+#define TEST_PC_E2E_PEER_PARAMS_PREPROCESSOR_H_
+
+#include <memory>
+#include <set>
+#include <string>
+
+#include "api/test/pclf/peer_configurer.h"
+
+namespace webrtc {
+namespace webrtc_pc_e2e {
+
+class PeerParamsPreprocessor {
+ public:
+  PeerParamsPreprocessor();
+  ~PeerParamsPreprocessor();
+
+  // Set missing params to default values if it is required:
+  //  * Generate video stream labels if some of them are missing
+  //  * Generate audio stream labels if some of them are missing
+  //  * Set video source generation mode if it is not specified
+  //  * Video codecs under test
+  void SetDefaultValuesForMissingParams(PeerConfigurer& peer);
+
+  // Validate peer's parameters, also ensure uniqueness of all video stream
+  // labels.
+  void ValidateParams(const PeerConfigurer& peer);
+
+ private:
+  class DefaultNamesProvider;
+  std::unique_ptr<DefaultNamesProvider> peer_names_provider_;
+
+  std::set<std::string> peer_names_;
+  std::set<std::string> video_labels_;
+  std::set<std::string> audio_labels_;
+  std::set<std::string> video_sync_groups_;
+  std::set<std::string> audio_sync_groups_;
+};
+
+}  // namespace webrtc_pc_e2e
+}  // namespace webrtc
+
+#endif  // TEST_PC_E2E_PEER_PARAMS_PREPROCESSOR_H_