1 files changed, 390 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util.cc b/third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util.cc
new file mode 100644
index 0000000000..35d66df203
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util.cc
@@ -0,0 +1,390 @@
+/*
+ *  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 "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 "rtc_base/checks.h"
+
+namespace webrtc {
+
+absl::optional<ScalabilityMode> ScalabilityModeFromString(
+    absl::string_view mode_string) {
+  if (mode_string == "L1T1")
+    return ScalabilityMode::kL1T1;
+  if (mode_string == "L1T2")
+    return ScalabilityMode::kL1T2;
+  if (mode_string == "L1T3")
+    return ScalabilityMode::kL1T3;
+
+  if (mode_string == "L2T1")
+    return ScalabilityMode::kL2T1;
+  if (mode_string == "L2T1h")
+    return ScalabilityMode::kL2T1h;
+  if (mode_string == "L2T1_KEY")
+    return ScalabilityMode::kL2T1_KEY;
+
+  if (mode_string == "L2T2")
+    return ScalabilityMode::kL2T2;
+  if (mode_string == "L2T2h")
+    return ScalabilityMode::kL2T2h;
+  if (mode_string == "L2T2_KEY")
+    return ScalabilityMode::kL2T2_KEY;
+  if (mode_string == "L2T2_KEY_SHIFT")
+    return ScalabilityMode::kL2T2_KEY_SHIFT;
+  if (mode_string == "L2T3")
+    return ScalabilityMode::kL2T3;
+  if (mode_string == "L2T3h")
+    return ScalabilityMode::kL2T3h;
+  if (mode_string == "L2T3_KEY")
+    return ScalabilityMode::kL2T3_KEY;
+
+  if (mode_string == "L3T1")
+    return ScalabilityMode::kL3T1;
+  if (mode_string == "L3T1h")
+    return ScalabilityMode::kL3T1h;
+  if (mode_string == "L3T1_KEY")
+    return ScalabilityMode::kL3T1_KEY;
+
+  if (mode_string == "L3T2")
+    return ScalabilityMode::kL3T2;
+  if (mode_string == "L3T2h")
+    return ScalabilityMode::kL3T2h;
+  if (mode_string == "L3T2_KEY")
+    return ScalabilityMode::kL3T2_KEY;
+
+  if (mode_string == "L3T3")
+    return ScalabilityMode::kL3T3;
+  if (mode_string == "L3T3h")
+    return ScalabilityMode::kL3T3h;
+  if (mode_string == "L3T3_KEY")
+    return ScalabilityMode::kL3T3_KEY;
+
+  if (mode_string == "S2T1")
+    return ScalabilityMode::kS2T1;
+  if (mode_string == "S2T1h")
+    return ScalabilityMode::kS2T1h;
+  if (mode_string == "S2T2")
+    return ScalabilityMode::kS2T2;
+  if (mode_string == "S2T2h")
+    return ScalabilityMode::kS2T2h;
+  if (mode_string == "S2T3")
+    return ScalabilityMode::kS2T3;
+  if (mode_string == "S2T3h")
+    return ScalabilityMode::kS2T3h;
+  if (mode_string == "S3T1")
+    return ScalabilityMode::kS3T1;
+  if (mode_string == "S3T1h")
+    return ScalabilityMode::kS3T1h;
+  if (mode_string == "S3T2")
+    return ScalabilityMode::kS3T2;
+  if (mode_string == "S3T2h")
+    return ScalabilityMode::kS3T2h;
+  if (mode_string == "S3T3")
+    return ScalabilityMode::kS3T3;
+  if (mode_string == "S3T3h")
+    return ScalabilityMode::kS3T3h;
+
+  return absl::nullopt;
+}
+
+InterLayerPredMode ScalabilityModeToInterLayerPredMode(
+    ScalabilityMode scalability_mode) {
+  switch (scalability_mode) {
+    case ScalabilityMode::kL1T1:
+    case ScalabilityMode::kL1T2:
+    case ScalabilityMode::kL1T3:
+    case ScalabilityMode::kL2T1:
+    case ScalabilityMode::kL2T1h:
+      return InterLayerPredMode::kOn;
+    case ScalabilityMode::kL2T1_KEY:
+      return InterLayerPredMode::kOnKeyPic;
+    case ScalabilityMode::kL2T2:
+    case ScalabilityMode::kL2T2h:
+      return InterLayerPredMode::kOn;
+    case ScalabilityMode::kL2T2_KEY:
+    case ScalabilityMode::kL2T2_KEY_SHIFT:
+      return InterLayerPredMode::kOnKeyPic;
+    case ScalabilityMode::kL2T3:
+    case ScalabilityMode::kL2T3h:
+      return InterLayerPredMode::kOn;
+    case ScalabilityMode::kL2T3_KEY:
+      return InterLayerPredMode::kOnKeyPic;
+    case ScalabilityMode::kL3T1:
+    case ScalabilityMode::kL3T1h:
+      return InterLayerPredMode::kOn;
+    case ScalabilityMode::kL3T1_KEY:
+      return InterLayerPredMode::kOnKeyPic;
+    case ScalabilityMode::kL3T2:
+    case ScalabilityMode::kL3T2h:
+      return InterLayerPredMode::kOn;
+    case ScalabilityMode::kL3T2_KEY:
+      return InterLayerPredMode::kOnKeyPic;
+    case ScalabilityMode::kL3T3:
+    case ScalabilityMode::kL3T3h:
+      return InterLayerPredMode::kOn;
+    case ScalabilityMode::kL3T3_KEY:
+      return InterLayerPredMode::kOnKeyPic;
+    case ScalabilityMode::kS2T1:
+    case ScalabilityMode::kS2T1h:
+    case ScalabilityMode::kS2T2:
+    case ScalabilityMode::kS2T2h:
+    case ScalabilityMode::kS2T3:
+    case ScalabilityMode::kS2T3h:
+    case ScalabilityMode::kS3T1:
+    case ScalabilityMode::kS3T1h:
+    case ScalabilityMode::kS3T2:
+    case ScalabilityMode::kS3T2h:
+    case ScalabilityMode::kS3T3:
+    case ScalabilityMode::kS3T3h:
+      return InterLayerPredMode::kOff;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+int ScalabilityModeToNumSpatialLayers(ScalabilityMode scalability_mode) {
+  switch (scalability_mode) {
+    case ScalabilityMode::kL1T1:
+    case ScalabilityMode::kL1T2:
+    case ScalabilityMode::kL1T3:
+      return 1;
+    case ScalabilityMode::kL2T1:
+    case ScalabilityMode::kL2T1h:
+    case ScalabilityMode::kL2T1_KEY:
+    case ScalabilityMode::kL2T2:
+    case ScalabilityMode::kL2T2h:
+    case ScalabilityMode::kL2T2_KEY:
+    case ScalabilityMode::kL2T2_KEY_SHIFT:
+    case ScalabilityMode::kL2T3:
+    case ScalabilityMode::kL2T3h:
+    case ScalabilityMode::kL2T3_KEY:
+      return 2;
+    case ScalabilityMode::kL3T1:
+    case ScalabilityMode::kL3T1h:
+    case ScalabilityMode::kL3T1_KEY:
+    case ScalabilityMode::kL3T2:
+    case ScalabilityMode::kL3T2h:
+    case ScalabilityMode::kL3T2_KEY:
+    case ScalabilityMode::kL3T3:
+    case ScalabilityMode::kL3T3h:
+    case ScalabilityMode::kL3T3_KEY:
+      return 3;
+    case ScalabilityMode::kS2T1:
+    case ScalabilityMode::kS2T1h:
+    case ScalabilityMode::kS2T2:
+    case ScalabilityMode::kS2T2h:
+    case ScalabilityMode::kS2T3:
+    case ScalabilityMode::kS2T3h:
+      return 2;
+    case ScalabilityMode::kS3T1:
+    case ScalabilityMode::kS3T1h:
+    case ScalabilityMode::kS3T2:
+    case ScalabilityMode::kS3T2h:
+    case ScalabilityMode::kS3T3:
+    case ScalabilityMode::kS3T3h:
+      return 3;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+int ScalabilityModeToNumTemporalLayers(ScalabilityMode scalability_mode) {
+  switch (scalability_mode) {
+    case ScalabilityMode::kL1T1:
+      return 1;
+    case ScalabilityMode::kL1T2:
+      return 2;
+    case ScalabilityMode::kL1T3:
+      return 3;
+    case ScalabilityMode::kL2T1:
+    case ScalabilityMode::kL2T1h:
+    case ScalabilityMode::kL2T1_KEY:
+      return 1;
+    case ScalabilityMode::kL2T2:
+    case ScalabilityMode::kL2T2h:
+    case ScalabilityMode::kL2T2_KEY:
+    case ScalabilityMode::kL2T2_KEY_SHIFT:
+      return 2;
+    case ScalabilityMode::kL2T3:
+    case ScalabilityMode::kL2T3h:
+    case ScalabilityMode::kL2T3_KEY:
+      return 3;
+    case ScalabilityMode::kL3T1:
+    case ScalabilityMode::kL3T1h:
+    case ScalabilityMode::kL3T1_KEY:
+      return 1;
+    case ScalabilityMode::kL3T2:
+    case ScalabilityMode::kL3T2h:
+    case ScalabilityMode::kL3T2_KEY:
+      return 2;
+    case ScalabilityMode::kL3T3:
+    case ScalabilityMode::kL3T3h:
+    case ScalabilityMode::kL3T3_KEY:
+      return 3;
+    case ScalabilityMode::kS2T1:
+    case ScalabilityMode::kS2T1h:
+    case ScalabilityMode::kS3T1:
+    case ScalabilityMode::kS3T1h:
+      return 1;
+    case ScalabilityMode::kS2T2:
+    case ScalabilityMode::kS2T2h:
+    case ScalabilityMode::kS3T2:
+    case ScalabilityMode::kS3T2h:
+      return 2;
+    case ScalabilityMode::kS2T3:
+    case ScalabilityMode::kS2T3h:
+    case ScalabilityMode::kS3T3:
+    case ScalabilityMode::kS3T3h:
+      return 3;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+absl::optional<ScalabilityModeResolutionRatio> ScalabilityModeToResolutionRatio(
+    ScalabilityMode scalability_mode) {
+  switch (scalability_mode) {
+    case ScalabilityMode::kL1T1:
+    case ScalabilityMode::kL1T2:
+    case ScalabilityMode::kL1T3:
+      return absl::nullopt;
+    case ScalabilityMode::kL2T1:
+    case ScalabilityMode::kL2T1_KEY:
+    case ScalabilityMode::kL2T2:
+    case ScalabilityMode::kL2T2_KEY:
+    case ScalabilityMode::kL2T2_KEY_SHIFT:
+    case ScalabilityMode::kL2T3:
+    case ScalabilityMode::kL2T3_KEY:
+    case ScalabilityMode::kL3T1:
+    case ScalabilityMode::kL3T1_KEY:
+    case ScalabilityMode::kL3T2:
+    case ScalabilityMode::kL3T2_KEY:
+    case ScalabilityMode::kL3T3:
+    case ScalabilityMode::kL3T3_KEY:
+    case ScalabilityMode::kS2T1:
+    case ScalabilityMode::kS2T2:
+    case ScalabilityMode::kS2T3:
+    case ScalabilityMode::kS3T1:
+    case ScalabilityMode::kS3T2:
+    case ScalabilityMode::kS3T3:
+      return ScalabilityModeResolutionRatio::kTwoToOne;
+    case ScalabilityMode::kL2T1h:
+    case ScalabilityMode::kL2T2h:
+    case ScalabilityMode::kL2T3h:
+    case ScalabilityMode::kL3T1h:
+    case ScalabilityMode::kL3T2h:
+    case ScalabilityMode::kL3T3h:
+    case ScalabilityMode::kS2T1h:
+    case ScalabilityMode::kS2T2h:
+    case ScalabilityMode::kS2T3h:
+    case ScalabilityMode::kS3T1h:
+    case ScalabilityMode::kS3T2h:
+    case ScalabilityMode::kS3T3h:
+      return ScalabilityModeResolutionRatio::kThreeToTwo;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+ScalabilityMode LimitNumSpatialLayers(ScalabilityMode scalability_mode,
+                                      int max_spatial_layers) {
+  int num_spatial_layers = ScalabilityModeToNumSpatialLayers(scalability_mode);
+  if (max_spatial_layers >= num_spatial_layers) {
+    return scalability_mode;
+  }
+
+  switch (scalability_mode) {
+    case ScalabilityMode::kL1T1:
+      return ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL1T2:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL1T3:
+      return ScalabilityMode::kL1T3;
+    case ScalabilityMode::kL2T1:
+      return ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL2T1h:
+      return ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL2T1_KEY:
+      return ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL2T2:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL2T2h:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL2T2_KEY:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL2T2_KEY_SHIFT:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL2T3:
+      return ScalabilityMode::kL1T3;
+    case ScalabilityMode::kL2T3h:
+      return ScalabilityMode::kL1T3;
+    case ScalabilityMode::kL2T3_KEY:
+      return ScalabilityMode::kL1T3;
+    case ScalabilityMode::kL3T1:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T1
+                                     : ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL3T1h:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T1h
+                                     : ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL3T1_KEY:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T1_KEY
+                                     : ScalabilityMode::kL1T1;
+    case ScalabilityMode::kL3T2:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T2
+                                     : ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL3T2h:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T2h
+                                     : ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL3T2_KEY:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T2_KEY
+                                     : ScalabilityMode::kL1T2;
+    case ScalabilityMode::kL3T3:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T3
+                                     : ScalabilityMode::kL1T3;
+    case ScalabilityMode::kL3T3h:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T3h
+                                     : ScalabilityMode::kL1T3;
+    case ScalabilityMode::kL3T3_KEY:
+      return max_spatial_layers == 2 ? ScalabilityMode::kL2T3_KEY
+                                     : ScalabilityMode::kL1T3;
+    case ScalabilityMode::kS2T1:
+      return ScalabilityMode::kL1T1;
+    case ScalabilityMode::kS2T1h:
+      return ScalabilityMode::kL1T1;
+    case ScalabilityMode::kS2T2:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kS2T2h:
+      return ScalabilityMode::kL1T2;
+    case ScalabilityMode::kS2T3:
+      return ScalabilityMode::kL1T3;
+    case ScalabilityMode::kS2T3h:
+      return ScalabilityMode::kL1T3;
+    case ScalabilityMode::kS3T1:
+      return max_spatial_layers == 2 ? ScalabilityMode::kS2T1
+                                     : ScalabilityMode::kL1T1;
+    case ScalabilityMode::kS3T1h:
+      return max_spatial_layers == 2 ? ScalabilityMode::kS2T1h
+                                     : ScalabilityMode::kL1T1;
+    case ScalabilityMode::kS3T2:
+      return max_spatial_layers == 2 ? ScalabilityMode::kS2T2
+                                     : ScalabilityMode::kL1T2;
+    case ScalabilityMode::kS3T2h:
+      return max_spatial_layers == 2 ? ScalabilityMode::kS2T2h
+                                     : ScalabilityMode::kL1T2;
+    case ScalabilityMode::kS3T3:
+      return max_spatial_layers == 2 ? ScalabilityMode::kS2T3
+                                     : ScalabilityMode::kL1T3;
+    case ScalabilityMode::kS3T3h:
+      return max_spatial_layers == 2 ? ScalabilityMode::kS2T3h
+                                     : ScalabilityMode::kL1T3;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+}  // namespace webrtc