frames_storage.h - mozsearch

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/*

 *  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.

*/

#ifndef TEST_PC_E2E_ANALYZER_VIDEO_DVQA_FRAMES_STORAGE_H_

#define TEST_PC_E2E_ANALYZER_VIDEO_DVQA_FRAMES_STORAGE_H_

#include <cstdint>

#include <unordered_map>

#include <vector>

#include "absl/types/optional.h"

#include "api/units/time_delta.h"

#include "api/units/timestamp.h"

#include "api/video/video_frame.h"

#include "system_wrappers/include/clock.h"

namespace webrtc {

// Stores video frames for DefaultVideoQualityAnalyzer. Frames are cleaned up

// when the time elapsed from their capture time exceeds `max_storage_duration`.

class FramesStorage {

 public:

  FramesStorage(TimeDelta max_storage_duration, Clock* clock)

      : max_storage_duration_(max_storage_duration), clock_(clock) {}

  FramesStorage(const FramesStorage&) = delete;

  FramesStorage& operator=(const FramesStorage&) = delete;

  FramesStorage(FramesStorage&&) = default;

  FramesStorage& operator=(FramesStorage&&) = default;

  // Adds frame to the storage. It is guaranteed to be stored at least

  // `max_storage_duration` from `captured_time`.

//

  // Complexity: O(log(n))

  void Add(const VideoFrame& frame, Timestamp captured_time);

  // Complexity: O(1)

  absl::optional<VideoFrame> Get(uint16_t frame_id);

  // Removes the frame identified by `frame_id` from the storage. No error

  // happens in case there isn't a frame identified by `frame_id`.

//

  // Complexity: O(log(n))

  void Remove(uint16_t frame_id);

 private:

  struct HeapNode {

    VideoFrame frame;

    Timestamp captured_time;

};

  void RemoveInternal(uint16_t frame_id);

  void Heapify(size_t index);

  void HeapifyUp(size_t index);

  void HeapifyDown(size_t index);

  // Complexity: O(#(of too old frames) * log(n))

  void RemoveTooOldFrames();

  TimeDelta max_storage_duration_;

  Clock* clock_;

  std::unordered_map<uint16_t, size_t> frame_id_index_;

  // Min-heap based on HeapNode::captured_time.

  std::vector<HeapNode> heap_;

};

}  // namespace webrtc

#endif  // TEST_PC_E2E_ANALYZER_VIDEO_DVQA_FRAMES_STORAGE_H_