1 /* 2 * Copyright (c) 2020 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #include "modules/video_coding/chain_diff_calculator.h" 11 12 #include <stddef.h> 13 #include <stdint.h> 14 15 #include <algorithm> 16 #include <vector> 17 18 #include "absl/container/inlined_vector.h" 19 #include "absl/types/optional.h" 20 #include "rtc_base/logging.h" 21 22 namespace webrtc { 23 Reset(const std::vector<bool> & chains)24void ChainDiffCalculator::Reset(const std::vector<bool>& chains) { 25 last_frame_in_chain_.resize(chains.size()); 26 for (size_t i = 0; i < chains.size(); ++i) { 27 if (chains[i]) { 28 last_frame_in_chain_[i] = absl::nullopt; 29 } 30 } 31 } 32 ChainDiffs(int64_t frame_id) const33absl::InlinedVector<int, 4> ChainDiffCalculator::ChainDiffs( 34 int64_t frame_id) const { 35 absl::InlinedVector<int, 4> result; 36 result.reserve(last_frame_in_chain_.size()); 37 for (const auto& frame_id_in_chain : last_frame_in_chain_) { 38 result.push_back(frame_id_in_chain ? (frame_id - *frame_id_in_chain) : 0); 39 } 40 return result; 41 } 42 From(int64_t frame_id,const std::vector<bool> & chains)43absl::InlinedVector<int, 4> ChainDiffCalculator::From( 44 int64_t frame_id, 45 const std::vector<bool>& chains) { 46 auto result = ChainDiffs(frame_id); 47 if (chains.size() != last_frame_in_chain_.size()) { 48 RTC_LOG(LS_ERROR) << "Insconsistent chain configuration for frame#" 49 << frame_id << ": expected " 50 << last_frame_in_chain_.size() << " chains, found " 51 << chains.size(); 52 } 53 size_t num_chains = std::min(last_frame_in_chain_.size(), chains.size()); 54 for (size_t i = 0; i < num_chains; ++i) { 55 if (chains[i]) { 56 last_frame_in_chain_[i] = frame_id; 57 } 58 } 59 return result; 60 } 61 62 } // namespace webrtc 63