1 files changed, 129 insertions, 0 deletions
diff --git a/third_party/libwebrtc/test/pc/e2e/analyzer/video/dvqa/frames_storage.cc b/third_party/libwebrtc/test/pc/e2e/analyzer/video/dvqa/frames_storage.cc
new file mode 100644
index 0000000000..2a70468e69
--- /dev/null
+++ b/third_party/libwebrtc/test/pc/e2e/analyzer/video/dvqa/frames_storage.cc
@@ -0,0 +1,129 @@
+/*
+ *  Copyright (c) 2023 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 "test/pc/e2e/analyzer/video/dvqa/frames_storage.h"
+
+#include <cstdint>
+#include <utility>
+
+#include "absl/types/optional.h"
+#include "api/units/timestamp.h"
+#include "api/video/video_frame.h"
+
+namespace webrtc {
+
+void FramesStorage::Add(const VideoFrame& frame, Timestamp captured_time) {
+  heap_.push_back(HeapNode{.frame = frame, .captured_time = captured_time});
+  frame_id_index_[frame.id()] = heap_.size() - 1;
+  Heapify(heap_.size() - 1);
+  RemoveTooOldFrames();
+}
+
+absl::optional<VideoFrame> FramesStorage::Get(uint16_t frame_id) {
+  auto it = frame_id_index_.find(frame_id);
+  if (it == frame_id_index_.end()) {
+    return absl::nullopt;
+  }
+
+  return heap_[it->second].frame;
+}
+
+void FramesStorage::Remove(uint16_t frame_id) {
+  RemoveInternal(frame_id);
+  RemoveTooOldFrames();
+}
+
+void FramesStorage::RemoveInternal(uint16_t frame_id) {
+  auto it = frame_id_index_.find(frame_id);
+  if (it == frame_id_index_.end()) {
+    return;
+  }
+
+  size_t index = it->second;
+  frame_id_index_.erase(it);
+
+  // If it's not the last element in the heap, swap the last element in the heap
+  // with element to remove.
+  if (index != heap_.size() - 1) {
+    heap_[index] = std::move(heap_[heap_.size() - 1]);
+    frame_id_index_[heap_[index].frame.id()] = index;
+  }
+
+  // Remove the last element.
+  heap_.pop_back();
+
+  if (index < heap_.size()) {
+    Heapify(index);
+  }
+}
+
+void FramesStorage::Heapify(size_t index) {
+  HeapifyUp(index);
+  HeapifyDown(index);
+}
+
+void FramesStorage::HeapifyUp(size_t index) {
+  if (index == 0) {
+    return;
+  }
+  RTC_CHECK_LT(index, heap_.size());
+  size_t parent = index / 2;
+  if (heap_[parent].captured_time <= heap_[index].captured_time) {
+    return;
+  }
+  HeapNode tmp = std::move(heap_[index]);
+  heap_[index] = std::move(heap_[parent]);
+  heap_[parent] = std::move(tmp);
+
+  frame_id_index_[heap_[index].frame.id()] = index;
+  frame_id_index_[heap_[parent].frame.id()] = parent;
+
+  HeapifyUp(parent);
+}
+
+void FramesStorage::HeapifyDown(size_t index) {
+  RTC_CHECK_GE(index, 0);
+  RTC_CHECK_LT(index, heap_.size());
+
+  size_t left_child = 2 * index;
+  size_t right_child = 2 * index + 1;
+
+  if (left_child >= heap_.size()) {
+    return;
+  }
+  size_t smallest_child = left_child;
+  if (right_child < heap_.size() &&
+      heap_[right_child].captured_time < heap_[left_child].captured_time) {
+    smallest_child = right_child;
+  }
+
+  if (heap_[index].captured_time <= heap_[smallest_child].captured_time) {
+    return;
+  }
+
+  HeapNode tmp = std::move(heap_[index]);
+  heap_[index] = std::move(heap_[smallest_child]);
+  heap_[smallest_child] = std::move(tmp);
+
+  frame_id_index_[heap_[index].frame.id()] = index;
+  frame_id_index_[heap_[smallest_child].frame.id()] = smallest_child;
+
+  HeapifyDown(smallest_child);
+}
+
+void FramesStorage::RemoveTooOldFrames() {
+  Timestamp now = clock_->CurrentTime();
+  while (!heap_.empty() &&
+         (heap_[0].captured_time + max_storage_duration_) < now) {
+    RemoveInternal(heap_[0].frame.id());
+  }
+}
+
+}  // namespace webrtc