1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator.h b/third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator.h
new file mode 100644
index 0000000000..2c4a8502e1
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator.h
@@ -0,0 +1,49 @@
+/*
+ *  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.
+ */
+
+#ifndef MODULES_VIDEO_CODING_FRAME_DEPENDENCIES_CALCULATOR_H_
+#define MODULES_VIDEO_CODING_FRAME_DEPENDENCIES_CALCULATOR_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "absl/container/inlined_vector.h"
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "common_video/generic_frame_descriptor/generic_frame_info.h"
+
+namespace webrtc {
+
+// This class is thread compatible.
+class FrameDependenciesCalculator {
+ public:
+  FrameDependenciesCalculator() = default;
+  FrameDependenciesCalculator(const FrameDependenciesCalculator&) = default;
+  FrameDependenciesCalculator& operator=(const FrameDependenciesCalculator&) =
+      default;
+
+  // Calculates frame dependencies based on previous encoder buffer usage.
+  absl::InlinedVector<int64_t, 5> FromBuffersUsage(
+      int64_t frame_id,
+      rtc::ArrayView<const CodecBufferUsage> buffers_usage);
+
+ private:
+  struct BufferUsage {
+    absl::optional<int64_t> frame_id;
+    absl::InlinedVector<int64_t, 4> dependencies;
+  };
+
+  absl::InlinedVector<BufferUsage, 4> buffers_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_FRAME_DEPENDENCIES_CALCULATOR_H_