1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/video_codecs/scalability_mode_helper.cc b/third_party/libwebrtc/api/video_codecs/scalability_mode_helper.cc
new file mode 100644
index 0000000000..b4571632d9
--- /dev/null
+++ b/third_party/libwebrtc/api/video_codecs/scalability_mode_helper.cc
@@ -0,0 +1,37 @@
+/*
+ *  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/scalability_mode_helper.h"
+
+#include "modules/video_coding/svc/scalability_mode_util.h"
+
+namespace webrtc {
+
+absl::optional<int> ScalabilityModeStringToNumSpatialLayers(
+    absl::string_view scalability_mode_string) {
+  absl::optional<ScalabilityMode> scalability_mode =
+      ScalabilityModeFromString(scalability_mode_string);
+  if (!scalability_mode.has_value()) {
+    return absl::nullopt;
+  }
+  return ScalabilityModeToNumSpatialLayers(*scalability_mode);
+}
+
+absl::optional<int> ScalabilityModeStringToNumTemporalLayers(
+    absl::string_view scalability_mode_string) {
+  absl::optional<ScalabilityMode> scalability_mode =
+      ScalabilityModeFromString(scalability_mode_string);
+  if (!scalability_mode.has_value()) {
+    return absl::nullopt;
+  }
+  return ScalabilityModeToNumTemporalLayers(*scalability_mode);
+}
+
+}  // namespace webrtc