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diff --git a/third_party/libwebrtc/modules/video_coding/svc/create_scalability_structure.cc b/third_party/libwebrtc/modules/video_coding/svc/create_scalability_structure.cc
new file mode 100644
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+++ b/third_party/libwebrtc/modules/video_coding/svc/create_scalability_structure.cc
@@ -0,0 +1,295 @@
+/*
+ *  Copyright (c) 2020 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 "modules/video_coding/svc/create_scalability_structure.h"
+
+#include <memory>
+
+#include "api/video_codecs/scalability_mode.h"
+#include "modules/video_coding/svc/scalability_structure_full_svc.h"
+#include "modules/video_coding/svc/scalability_structure_key_svc.h"
+#include "modules/video_coding/svc/scalability_structure_l2t2_key_shift.h"
+#include "modules/video_coding/svc/scalability_structure_simulcast.h"
+#include "modules/video_coding/svc/scalable_video_controller.h"
+#include "modules/video_coding/svc/scalable_video_controller_no_layering.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+namespace {
+
+struct NamedStructureFactory {
+  ScalabilityMode name;
+  // Use function pointer to make NamedStructureFactory trivally destructable.
+  std::unique_ptr<ScalableVideoController> (*factory)();
+  ScalableVideoController::StreamLayersConfig config;
+};
+
+// Wrap std::make_unique function to have correct return type.
+template <typename T>
+std::unique_ptr<ScalableVideoController> Create() {
+  return std::make_unique<T>();
+}
+
+template <typename T>
+std::unique_ptr<ScalableVideoController> CreateH() {
+  // 1.5:1 scaling, see https://w3c.github.io/webrtc-svc/#scalabilitymodes*
+  typename T::ScalingFactor factor;
+  factor.num = 2;
+  factor.den = 3;
+  return std::make_unique<T>(factor);
+}
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL1T1 = {
+    /*num_spatial_layers=*/1, /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/false};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL1T2 = {
+    /*num_spatial_layers=*/1, /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/false};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL1T3 = {
+    /*num_spatial_layers=*/1, /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/false};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL2T1 = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/true,
+    {1, 1},
+    {2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL2T1h = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/true,
+    {2, 1},
+    {3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL2T2 = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/true,
+    {1, 1},
+    {2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL2T2h = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/true,
+    {2, 1},
+    {3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL2T3 = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/true,
+    {1, 1},
+    {2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL2T3h = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/true,
+    {2, 1},
+    {3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL3T1 = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/true,
+    {1, 1, 1},
+    {4, 2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL3T1h = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/true,
+    {4, 2, 1},
+    {9, 3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL3T2 = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/true,
+    {1, 1, 1},
+    {4, 2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL3T2h = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/true,
+    {4, 2, 1},
+    {9, 3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL3T3 = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/true,
+    {1, 1, 1},
+    {4, 2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigL3T3h = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/true,
+    {4, 2, 1},
+    {9, 3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS2T1 = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/false,
+    {1, 1},
+    {2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS2T1h = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/false,
+    {2, 1},
+    {3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS2T2 = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/false,
+    {1, 1},
+    {2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS2T2h = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/false,
+    {2, 1},
+    {3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS2T3 = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/false,
+    {1, 1},
+    {2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS2T3h = {
+    /*num_spatial_layers=*/2,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/false,
+    {2, 1},
+    {3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS3T1 = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/false,
+    {1, 1, 1},
+    {4, 2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS3T1h = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/1,
+    /*uses_reference_scaling=*/false,
+    {4, 2, 1},
+    {9, 3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS3T2 = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/false,
+    {1, 1, 1},
+    {4, 2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS3T2h = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/2,
+    /*uses_reference_scaling=*/false,
+    {4, 2, 1},
+    {9, 3, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS3T3 = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/false,
+    {1, 1, 1},
+    {4, 2, 1}};
+
+constexpr ScalableVideoController::StreamLayersConfig kConfigS3T3h = {
+    /*num_spatial_layers=*/3,
+    /*num_temporal_layers=*/3,
+    /*uses_reference_scaling=*/false,
+    {4, 2, 1},
+    {9, 3, 1}};
+
+constexpr NamedStructureFactory kFactories[] = {
+    {ScalabilityMode::kL1T1, Create<ScalableVideoControllerNoLayering>,
+     kConfigL1T1},
+    {ScalabilityMode::kL1T2, Create<ScalabilityStructureL1T2>, kConfigL1T2},
+    {ScalabilityMode::kL1T3, Create<ScalabilityStructureL1T3>, kConfigL1T3},
+    {ScalabilityMode::kL2T1, Create<ScalabilityStructureL2T1>, kConfigL2T1},
+    {ScalabilityMode::kL2T1h, CreateH<ScalabilityStructureL2T1>, kConfigL2T1h},
+    {ScalabilityMode::kL2T1_KEY, Create<ScalabilityStructureL2T1Key>,
+     kConfigL2T1},
+    {ScalabilityMode::kL2T2, Create<ScalabilityStructureL2T2>, kConfigL2T2},
+    {ScalabilityMode::kL2T2h, CreateH<ScalabilityStructureL2T2>, kConfigL2T2h},
+    {ScalabilityMode::kL2T2_KEY, Create<ScalabilityStructureL2T2Key>,
+     kConfigL2T2},
+    {ScalabilityMode::kL2T2_KEY_SHIFT, Create<ScalabilityStructureL2T2KeyShift>,
+     kConfigL2T2},
+    {ScalabilityMode::kL2T3, Create<ScalabilityStructureL2T3>, kConfigL2T3},
+    {ScalabilityMode::kL2T3h, CreateH<ScalabilityStructureL2T3>, kConfigL2T3h},
+    {ScalabilityMode::kL2T3_KEY, Create<ScalabilityStructureL2T3Key>,
+     kConfigL2T3},
+    {ScalabilityMode::kL3T1, Create<ScalabilityStructureL3T1>, kConfigL3T1},
+    {ScalabilityMode::kL3T1h, CreateH<ScalabilityStructureL3T1>, kConfigL3T1h},
+    {ScalabilityMode::kL3T1_KEY, Create<ScalabilityStructureL3T1Key>,
+     kConfigL3T1},
+    {ScalabilityMode::kL3T2, Create<ScalabilityStructureL3T2>, kConfigL3T2},
+    {ScalabilityMode::kL3T2h, CreateH<ScalabilityStructureL3T2>, kConfigL3T2h},
+    {ScalabilityMode::kL3T2_KEY, Create<ScalabilityStructureL3T2Key>,
+     kConfigL3T2},
+    {ScalabilityMode::kL3T3, Create<ScalabilityStructureL3T3>, kConfigL3T3},
+    {ScalabilityMode::kL3T3h, CreateH<ScalabilityStructureL3T3>, kConfigL3T3h},
+    {ScalabilityMode::kL3T3_KEY, Create<ScalabilityStructureL3T3Key>,
+     kConfigL3T3},
+    {ScalabilityMode::kS2T1, Create<ScalabilityStructureS2T1>, kConfigS2T1},
+    {ScalabilityMode::kS2T1h, CreateH<ScalabilityStructureS2T1>, kConfigS2T1h},
+    {ScalabilityMode::kS2T2, Create<ScalabilityStructureS2T2>, kConfigS2T2},
+    {ScalabilityMode::kS2T2h, CreateH<ScalabilityStructureS2T2>, kConfigS2T2h},
+    {ScalabilityMode::kS2T3, Create<ScalabilityStructureS2T3>, kConfigS2T3},
+    {ScalabilityMode::kS2T3h, CreateH<ScalabilityStructureS2T3>, kConfigS2T3h},
+    {ScalabilityMode::kS3T1, Create<ScalabilityStructureS3T1>, kConfigS3T1},
+    {ScalabilityMode::kS3T1h, CreateH<ScalabilityStructureS3T1>, kConfigS3T1h},
+    {ScalabilityMode::kS3T2, Create<ScalabilityStructureS3T2>, kConfigS3T2},
+    {ScalabilityMode::kS3T2h, CreateH<ScalabilityStructureS3T2>, kConfigS3T2h},
+    {ScalabilityMode::kS3T3, Create<ScalabilityStructureS3T3>, kConfigS3T3},
+    {ScalabilityMode::kS3T3h, CreateH<ScalabilityStructureS3T3>, kConfigS3T3h},
+};
+
+}  // namespace
+
+std::unique_ptr<ScalableVideoController> CreateScalabilityStructure(
+    ScalabilityMode name) {
+  for (const auto& entry : kFactories) {
+    if (entry.name == name) {
+      return entry.factory();
+    }
+  }
+  return nullptr;
+}
+
+absl::optional<ScalableVideoController::StreamLayersConfig>
+ScalabilityStructureConfig(ScalabilityMode name) {
+  for (const auto& entry : kFactories) {
+    if (entry.name == name) {
+      return entry.config;
+    }
+  }
+  return absl::nullopt;
+}
+
+}  // namespace webrtc