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/*
* 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_CHAIN_DIFF_CALCULATOR_H_
#define MODULES_VIDEO_CODING_CHAIN_DIFF_CALCULATOR_H_
#include <stdint.h>
#include <vector>
#include "absl/container/inlined_vector.h"
#include "absl/types/optional.h"
namespace webrtc {
// This class is thread compatible.
class ChainDiffCalculator {
public:
ChainDiffCalculator() = default;
ChainDiffCalculator(const ChainDiffCalculator&) = default;
ChainDiffCalculator& operator=(const ChainDiffCalculator&) = default;
// Restarts chains, i.e. for position where chains[i] == true next chain_diff
// will be 0. Saves chains.size() as number of chains in the stream.
void Reset(const std::vector<bool>& chains);
// Returns chain diffs based on flags if frame is part of the chain.
absl::InlinedVector<int, 4> From(int64_t frame_id,
const std::vector<bool>& chains);
private:
absl::InlinedVector<int, 4> ChainDiffs(int64_t frame_id) const;
absl::InlinedVector<absl::optional<int64_t>, 4> last_frame_in_chain_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_CHAIN_DIFF_CALCULATOR_H_
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