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https://github.com/mollyim/webrtc.git
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7de81e2717
Bug: webrtc:13343 Change-Id: I3f4e015e683f4003bb038424646cb51ae26c76fa Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/236848 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Evan Shrubsole <eshr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35329}
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/video_coding/utility/decoded_frames_history.h"
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#include <algorithm>
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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namespace video_coding {
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DecodedFramesHistory::DecodedFramesHistory(size_t window_size)
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: buffer_(window_size) {}
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DecodedFramesHistory::~DecodedFramesHistory() = default;
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void DecodedFramesHistory::InsertDecoded(int64_t frame_id, uint32_t timestamp) {
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last_decoded_frame_ = frame_id;
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last_decoded_frame_timestamp_ = timestamp;
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int new_index = FrameIdToIndex(frame_id);
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RTC_DCHECK(last_frame_id_ < frame_id);
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// Clears expired values from the cyclic buffer_.
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if (last_frame_id_) {
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int64_t id_jump = frame_id - *last_frame_id_;
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int last_index = FrameIdToIndex(*last_frame_id_);
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if (id_jump >= static_cast<int64_t>(buffer_.size())) {
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std::fill(buffer_.begin(), buffer_.end(), false);
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} else if (new_index > last_index) {
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std::fill(buffer_.begin() + last_index + 1, buffer_.begin() + new_index,
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false);
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} else {
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std::fill(buffer_.begin() + last_index + 1, buffer_.end(), false);
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std::fill(buffer_.begin(), buffer_.begin() + new_index, false);
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}
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}
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buffer_[new_index] = true;
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last_frame_id_ = frame_id;
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}
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bool DecodedFramesHistory::WasDecoded(int64_t frame_id) const {
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if (!last_frame_id_)
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return false;
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// Reference to the picture_id out of the stored should happen.
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if (frame_id <= *last_frame_id_ - static_cast<int64_t>(buffer_.size())) {
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RTC_LOG(LS_WARNING) << "Referencing a frame out of the window. "
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"Assuming it was undecoded to avoid artifacts.";
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return false;
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}
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if (frame_id > last_frame_id_)
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return false;
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return buffer_[FrameIdToIndex(frame_id)];
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}
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void DecodedFramesHistory::Clear() {
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last_decoded_frame_timestamp_.reset();
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last_decoded_frame_.reset();
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std::fill(buffer_.begin(), buffer_.end(), false);
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last_frame_id_.reset();
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}
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absl::optional<int64_t> DecodedFramesHistory::GetLastDecodedFrameId() const {
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return last_decoded_frame_;
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}
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absl::optional<uint32_t> DecodedFramesHistory::GetLastDecodedFrameTimestamp()
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const {
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return last_decoded_frame_timestamp_;
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}
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int DecodedFramesHistory::FrameIdToIndex(int64_t frame_id) const {
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int m = frame_id % buffer_.size();
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return m >= 0 ? m : m + buffer_.size();
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}
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} // namespace video_coding
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} // namespace webrtc
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