diff --git a/api/video_codecs/BUILD.gn b/api/video_codecs/BUILD.gn
index 0b6db8711d..4c91482afb 100644
--- a/api/video_codecs/BUILD.gn
+++ b/api/video_codecs/BUILD.gn
@@ -34,6 +34,7 @@ rtc_library("video_codecs_api") {
     "h264_profile_level_id.h",
     "sdp_video_format.cc",
     "sdp_video_format.h",
+    "simulcast_stream.cc",
     "simulcast_stream.h",
     "spatial_layer.cc",
     "spatial_layer.h",
diff --git a/api/video_codecs/simulcast_stream.cc b/api/video_codecs/simulcast_stream.cc
new file mode 100644
index 0000000000..aa3486dc5d
--- /dev/null
+++ b/api/video_codecs/simulcast_stream.cc
@@ -0,0 +1,32 @@
+/*
+ *  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.
+ */
+
+#include "api/video_codecs/simulcast_stream.h"
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+unsigned char SimulcastStream::GetNumberOfTemporalLayers() const {
+  return numberOfTemporalLayers;
+}
+
+ScalabilityMode SimulcastStream::GetScalabilityMode() const {
+  RTC_CHECK_GE(numberOfTemporalLayers, 1);
+  RTC_CHECK_LE(numberOfTemporalLayers, 3);
+  static const ScalabilityMode scalability_modes[3] = {
+      ScalabilityMode::kL1T1,
+      ScalabilityMode::kL1T2,
+      ScalabilityMode::kL1T3,
+  };
+  return scalability_modes[numberOfTemporalLayers - 1];
+}
+
+}  // namespace webrtc
diff --git a/api/video_codecs/simulcast_stream.h b/api/video_codecs/simulcast_stream.h
index 578275b852..8e55a9532d 100644
--- a/api/video_codecs/simulcast_stream.h
+++ b/api/video_codecs/simulcast_stream.h
@@ -11,11 +11,18 @@
 #ifndef API_VIDEO_CODECS_SIMULCAST_STREAM_H_
 #define API_VIDEO_CODECS_SIMULCAST_STREAM_H_
 
+#include "api/video_codecs/scalability_mode.h"
+
 namespace webrtc {
 
 // TODO(bugs.webrtc.org/6883): Unify with struct VideoStream, part of
 // VideoEncoderConfig.
 struct SimulcastStream {
+  // Temporary utility methods for transition from numberOfTemporalLayers
+  // setting to ScalabilityMode.
+  unsigned char GetNumberOfTemporalLayers() const;
+  ScalabilityMode GetScalabilityMode() const;
+
   int width = 0;
   int height = 0;
   float maxFramerate = 0;  // fps.
diff --git a/api/video_codecs/video_codec.h b/api/video_codecs/video_codec.h
index 068b09d27a..10bceda0d2 100644
--- a/api/video_codecs/video_codec.h
+++ b/api/video_codecs/video_codec.h
@@ -44,6 +44,11 @@ struct VideoCodecVP8 {
   bool operator!=(const VideoCodecVP8& other) const {
     return !(*this == other);
   }
+  // Temporary utility method for transition deleting numberOfTemporalLayers
+  // setting (replaced by ScalabilityMode).
+  void SetNumberOfTemporalLayers(unsigned char n) {
+    numberOfTemporalLayers = n;
+  }
   unsigned char numberOfTemporalLayers;
   bool denoisingOn;
   bool automaticResizeOn;
@@ -62,6 +67,11 @@ struct VideoCodecVP9 {
   bool operator!=(const VideoCodecVP9& other) const {
     return !(*this == other);
   }
+  // Temporary utility method for transition deleting numberOfTemporalLayers
+  // setting (replaced by ScalabilityMode).
+  void SetNumberOfTemporalLayers(unsigned char n) {
+    numberOfTemporalLayers = n;
+  }
   unsigned char numberOfTemporalLayers;
   bool denoisingOn;
   int keyFrameInterval;
@@ -78,6 +88,11 @@ struct VideoCodecH264 {
   bool operator!=(const VideoCodecH264& other) const {
     return !(*this == other);
   }
+  // Temporary utility method for transition deleting numberOfTemporalLayers
+  // setting (replaced by ScalabilityMode).
+  void SetNumberOfTemporalLayers(unsigned char n) {
+    numberOfTemporalLayers = n;
+  }
   int keyFrameInterval;
   uint8_t numberOfTemporalLayers;
 };