1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory.cc b/third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory.cc
new file mode 100644
index 0000000000..193494d71d
--- /dev/null
+++ b/third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory.cc
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2019 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/vp8_temporal_layers_factory.h"
+
+#include <algorithm>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "api/fec_controller_override.h"
+#include "modules/video_coding/codecs/vp8/default_temporal_layers.h"
+#include "modules/video_coding/codecs/vp8/screenshare_layers.h"
+#include "modules/video_coding/utility/simulcast_utility.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+std::unique_ptr<Vp8FrameBufferController> Vp8TemporalLayersFactory::Create(
+    const VideoCodec& codec,
+    const VideoEncoder::Settings& settings,
+    FecControllerOverride* fec_controller_override) {
+  std::vector<std::unique_ptr<Vp8FrameBufferController>> controllers;
+  const int num_streams = SimulcastUtility::NumberOfSimulcastStreams(codec);
+  RTC_DCHECK_GE(num_streams, 1);
+  controllers.reserve(num_streams);
+
+  for (int i = 0; i < num_streams; ++i) {
+    int num_temporal_layers =
+        SimulcastUtility::NumberOfTemporalLayers(codec, i);
+    RTC_DCHECK_GE(num_temporal_layers, 1);
+    if (SimulcastUtility::IsConferenceModeScreenshare(codec) && i == 0) {
+      // Legacy screenshare layers supports max 2 layers.
+      num_temporal_layers = std::max(2, num_temporal_layers);
+      controllers.push_back(
+          std::make_unique<ScreenshareLayers>(num_temporal_layers));
+    } else {
+      controllers.push_back(
+          std::make_unique<DefaultTemporalLayers>(num_temporal_layers));
+    }
+  }
+
+  return std::make_unique<Vp8TemporalLayers>(std::move(controllers),
+                                             fec_controller_override);
+}
+
+std::unique_ptr<Vp8FrameBufferControllerFactory>
+Vp8TemporalLayersFactory::Clone() const {
+  return std::make_unique<Vp8TemporalLayersFactory>();
+}
+
+}  // namespace webrtc