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