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13717842df
This is a space efficient way to store more records about decoded frames, which is needed for long term references. Bug: webrtc:9710 Change-Id: I051d59d34a966d48db011142466d9cd15304b7d9 Reviewed-on: https://webrtc-review.googlesource.com/c/116792 Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26240}
108 lines
3.7 KiB
C++
108 lines
3.7 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::LayerHistory::LayerHistory() = default;
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DecodedFramesHistory::LayerHistory::~LayerHistory() = default;
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DecodedFramesHistory::DecodedFramesHistory(size_t window_size)
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: window_size_(window_size) {}
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DecodedFramesHistory::~DecodedFramesHistory() = default;
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void DecodedFramesHistory::InsertDecoded(const VideoLayerFrameId& frameid,
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uint32_t timestamp) {
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last_decoded_frame_ = frameid;
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last_decoded_frame_timestamp_ = timestamp;
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if (static_cast<int>(layers_.size()) < frameid.spatial_layer + 1) {
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layers_.resize(frameid.spatial_layer + 1);
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layers_[frameid.spatial_layer].buffer.resize(window_size_);
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layers_[frameid.spatial_layer].last_stored_index = frameid.picture_id;
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layers_[frameid.spatial_layer].buffer[frameid.picture_id % window_size_] =
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true;
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return;
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}
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LayerHistory& history = layers_[frameid.spatial_layer];
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RTC_DCHECK_LT(history.last_stored_index, frameid.picture_id);
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int64_t id_jump = frameid.picture_id - history.last_stored_index;
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int last_index = history.last_stored_index % window_size_;
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int new_index = frameid.picture_id % window_size_;
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// Need to clear indexes between last_index + 1 and new_index as they fall
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// out of the history window and now represent new unseen picture ids.
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if (id_jump >= window_size_) {
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// Wraps around whole buffer - clear it all.
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std::fill(history.buffer.begin(), history.buffer.end(), false);
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} else if (new_index > last_index) {
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std::fill(history.buffer.begin() + last_index + 1,
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history.buffer.begin() + new_index, false);
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} else {
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std::fill(history.buffer.begin() + last_index + 1, history.buffer.end(),
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false);
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std::fill(history.buffer.begin(), history.buffer.begin() + new_index,
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false);
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}
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history.buffer[new_index] = true;
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history.last_stored_index = frameid.picture_id;
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}
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bool DecodedFramesHistory::WasDecoded(const VideoLayerFrameId& frameid) {
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// Unseen before spatial layer.
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if (static_cast<int>(layers_.size()) < frameid.spatial_layer + 1)
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return false;
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LayerHistory& history = layers_[frameid.spatial_layer];
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// Reference to the picture_id out of the stored history should happen.
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if (frameid.picture_id <= history.last_stored_index - window_size_) {
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RTC_LOG(LS_WARNING) << "Referencing a frame out of the history 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 (frameid.picture_id > history.last_stored_index)
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return false;
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return history.buffer[frameid.picture_id % window_size_];
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}
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void DecodedFramesHistory::Clear() {
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for (LayerHistory& layer : layers_) {
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std::fill(layer.buffer.begin(), layer.buffer.end(), false);
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layer.last_stored_index = 0;
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}
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last_decoded_frame_timestamp_.reset();
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last_decoded_frame_.reset();
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}
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absl::optional<VideoLayerFrameId>
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DecodedFramesHistory::GetLastDecodedFrameId() {
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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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return last_decoded_frame_timestamp_;
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}
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} // namespace video_coding
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} // namespace webrtc
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