1 files changed, 88 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_no_layering.cc b/third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_no_layering.cc
new file mode 100644
index 0000000000..a9d530dd9d
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_no_layering.cc
@@ -0,0 +1,88 @@
+/*
+ *  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/scalable_video_controller_no_layering.h"
+
+#include <utility>
+#include <vector>
+
+#include "api/transport/rtp/dependency_descriptor.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+ScalableVideoControllerNoLayering::~ScalableVideoControllerNoLayering() =
+    default;
+
+ScalableVideoController::StreamLayersConfig
+ScalableVideoControllerNoLayering::StreamConfig() const {
+  StreamLayersConfig result;
+  result.num_spatial_layers = 1;
+  result.num_temporal_layers = 1;
+  result.uses_reference_scaling = false;
+  return result;
+}
+
+FrameDependencyStructure
+ScalableVideoControllerNoLayering::DependencyStructure() const {
+  FrameDependencyStructure structure;
+  structure.num_decode_targets = 1;
+  structure.num_chains = 1;
+  structure.decode_target_protected_by_chain = {0};
+
+  FrameDependencyTemplate key_frame;
+  key_frame.decode_target_indications = {DecodeTargetIndication::kSwitch};
+  key_frame.chain_diffs = {0};
+  structure.templates.push_back(key_frame);
+
+  FrameDependencyTemplate delta_frame;
+  delta_frame.decode_target_indications = {DecodeTargetIndication::kSwitch};
+  delta_frame.chain_diffs = {1};
+  delta_frame.frame_diffs = {1};
+  structure.templates.push_back(delta_frame);
+
+  return structure;
+}
+
+std::vector<ScalableVideoController::LayerFrameConfig>
+ScalableVideoControllerNoLayering::NextFrameConfig(bool restart) {
+  if (!enabled_) {
+    return {};
+  }
+  std::vector<LayerFrameConfig> result(1);
+  if (restart || start_) {
+    result[0].Id(0).Keyframe().Update(0);
+  } else {
+    result[0].Id(0).ReferenceAndUpdate(0);
+  }
+  start_ = false;
+  return result;
+}
+
+GenericFrameInfo ScalableVideoControllerNoLayering::OnEncodeDone(
+    const LayerFrameConfig& config) {
+  RTC_DCHECK_EQ(config.Id(), 0);
+  GenericFrameInfo frame_info;
+  frame_info.encoder_buffers = config.Buffers();
+  if (config.IsKeyframe()) {
+    for (auto& buffer : frame_info.encoder_buffers) {
+      buffer.referenced = false;
+    }
+  }
+  frame_info.decode_target_indications = {DecodeTargetIndication::kSwitch};
+  frame_info.part_of_chain = {true};
+  return frame_info;
+}
+
+void ScalableVideoControllerNoLayering::OnRatesUpdated(
+    const VideoBitrateAllocation& bitrates) {
+  enabled_ = bitrates.GetBitrate(0, 0) > 0;
+}
+
+}  // namespace webrtc