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/*
* Copyright (c) 2019 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.
*/
#include "modules/video_coding/utility/decoded_frames_history.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <optional>
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace video_coding {
DecodedFramesHistory::DecodedFramesHistory(size_t window_size)
: buffer_(window_size) {}
DecodedFramesHistory::~DecodedFramesHistory() = default;
void DecodedFramesHistory::InsertDecoded(int64_t frame_id, uint32_t timestamp) {
last_decoded_frame_ = frame_id;
last_decoded_frame_timestamp_ = timestamp;
int new_index = FrameIdToIndex(frame_id);
RTC_DCHECK(last_frame_id_ < frame_id);
// Clears expired values from the cyclic buffer_.
if (last_frame_id_) {
int64_t id_jump = frame_id - *last_frame_id_;
int last_index = FrameIdToIndex(*last_frame_id_);
if (id_jump >= static_cast<int64_t>(buffer_.size())) {
std::fill(buffer_.begin(), buffer_.end(), false);
} else if (new_index > last_index) {
std::fill(buffer_.begin() + last_index + 1, buffer_.begin() + new_index,
false);
} else {
std::fill(buffer_.begin() + last_index + 1, buffer_.end(), false);
std::fill(buffer_.begin(), buffer_.begin() + new_index, false);
}
}
buffer_[new_index] = true;
last_frame_id_ = frame_id;
}
bool DecodedFramesHistory::WasDecoded(int64_t frame_id) const {
if (!last_frame_id_)
return false;
// Reference to the picture_id out of the stored should happen.
if (frame_id <= *last_frame_id_ - static_cast<int64_t>(buffer_.size())) {
RTC_LOG(LS_WARNING) << "Referencing a frame out of the window. "
"Assuming it was undecoded to avoid artifacts.";
return false;
}
if (frame_id > last_frame_id_)
return false;
return buffer_[FrameIdToIndex(frame_id)];
}
void DecodedFramesHistory::Clear() {
last_decoded_frame_timestamp_.reset();
last_decoded_frame_.reset();
std::fill(buffer_.begin(), buffer_.end(), false);
last_frame_id_.reset();
}
std::optional<int64_t> DecodedFramesHistory::GetLastDecodedFrameId() const {
return last_decoded_frame_;
}
std::optional<uint32_t> DecodedFramesHistory::GetLastDecodedFrameTimestamp()
const {
return last_decoded_frame_timestamp_;
}
int DecodedFramesHistory::FrameIdToIndex(int64_t frame_id) const {
int m = frame_id % buffer_.size();
return m >= 0 ? m : m + buffer_.size();
}
} // namespace video_coding
} // namespace webrtc
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