69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
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/*
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* Copyright (c) 2014 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 "video/report_block_stats.h"
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#include <algorithm>
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namespace webrtc {
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namespace {
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int FractionLost(uint32_t num_lost_sequence_numbers,
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uint32_t num_sequence_numbers) {
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if (num_sequence_numbers == 0) {
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return 0;
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}
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return ((num_lost_sequence_numbers * 255) + (num_sequence_numbers / 2)) /
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num_sequence_numbers;
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}
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} // namespace
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// Helper class for rtcp statistics.
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ReportBlockStats::ReportBlockStats()
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: num_sequence_numbers_(0), num_lost_sequence_numbers_(0) {}
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ReportBlockStats::~ReportBlockStats() {}
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void ReportBlockStats::Store(uint32_t ssrc, const RtcpStatistics& rtcp_stats) {
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Report report;
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report.packets_lost = rtcp_stats.packets_lost;
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report.extended_highest_sequence_number =
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rtcp_stats.extended_highest_sequence_number;
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StoreAndAddPacketIncrement(ssrc, report);
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}
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void ReportBlockStats::StoreAndAddPacketIncrement(uint32_t ssrc,
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const Report& report) {
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// Get diff with previous report block.
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const auto prev_report = prev_reports_.find(ssrc);
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if (prev_report != prev_reports_.end()) {
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int seq_num_diff = report.extended_highest_sequence_number -
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prev_report->second.extended_highest_sequence_number;
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int cum_loss_diff = report.packets_lost - prev_report->second.packets_lost;
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if (seq_num_diff >= 0 && cum_loss_diff >= 0) {
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// Update total number of packets/lost packets.
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num_sequence_numbers_ += seq_num_diff;
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num_lost_sequence_numbers_ += cum_loss_diff;
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}
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}
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// Store current report block.
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prev_reports_[ssrc] = report;
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}
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int ReportBlockStats::FractionLostInPercent() const {
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if (num_sequence_numbers_ == 0) {
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return -1;
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}
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return FractionLost(num_lost_sequence_numbers_, num_sequence_numbers_) * 100 /
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255;
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}
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} // namespace webrtc
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