1 files changed, 46 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util.h b/third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util.h
new file mode 100644
index 0000000000..9c8193e037
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util.h
@@ -0,0 +1,46 @@
+/*
+ *  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 MODULES_VIDEO_CODING_SVC_SCALABILITY_MODE_UTIL_H_
+#define MODULES_VIDEO_CODING_SVC_SCALABILITY_MODE_UTIL_H_
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "api/video_codecs/scalability_mode.h"
+#include "api/video_codecs/video_codec.h"
+
+namespace webrtc {
+
+enum class ScalabilityModeResolutionRatio {
+  kTwoToOne,    // The resolution ratio between spatial layers is 2:1.
+  kThreeToTwo,  // The resolution ratio between spatial layers is 1.5:1.
+};
+
+static constexpr char kDefaultScalabilityModeStr[] = "L1T2";
+
+absl::optional<ScalabilityMode> ScalabilityModeFromString(
+    absl::string_view scalability_mode_string);
+
+InterLayerPredMode ScalabilityModeToInterLayerPredMode(
+    ScalabilityMode scalability_mode);
+
+int ScalabilityModeToNumSpatialLayers(ScalabilityMode scalability_mode);
+
+int ScalabilityModeToNumTemporalLayers(ScalabilityMode scalability_mode);
+
+absl::optional<ScalabilityModeResolutionRatio> ScalabilityModeToResolutionRatio(
+    ScalabilityMode scalability_mode);
+
+ScalabilityMode LimitNumSpatialLayers(ScalabilityMode scalability_mode,
+                                      int max_spatial_layers);
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_SVC_SCALABILITY_MODE_UTIL_H_