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/*
* Copyright (c) 2012 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 "webrtc/video_engine/call_stats.h"
#include <assert.h>
#include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h"
#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
#include "webrtc/system_wrappers/include/tick_util.h"
namespace webrtc {
namespace {
// Time interval for updating the observers.
const int64_t kUpdateIntervalMs = 1000;
// Weight factor to apply to the average rtt.
const float kWeightFactor = 0.3f;
void RemoveOldReports(int64_t now, std::list<CallStats::RttTime>* reports) {
// A rtt report is considered valid for this long.
const int64_t kRttTimeoutMs = 1500;
while (!reports->empty() &&
(now - reports->front().time) > kRttTimeoutMs) {
reports->pop_front();
}
}
int64_t GetMaxRttMs(std::list<CallStats::RttTime>* reports) {
int64_t max_rtt_ms = 0;
for (std::list<CallStats::RttTime>::const_iterator it = reports->begin();
it != reports->end(); ++it) {
max_rtt_ms = std::max(it->rtt, max_rtt_ms);
}
return max_rtt_ms;
}
int64_t GetAvgRttMs(std::list<CallStats::RttTime>* reports) {
if (reports->empty()) {
return 0;
}
int64_t sum = 0;
for (std::list<CallStats::RttTime>::const_iterator it = reports->begin();
it != reports->end(); ++it) {
sum += it->rtt;
}
return sum / reports->size();
}
void UpdateAvgRttMs(std::list<CallStats::RttTime>* reports, int64_t* avg_rtt) {
uint32_t cur_rtt_ms = GetAvgRttMs(reports);
if (cur_rtt_ms == 0) {
// Reset.
*avg_rtt = 0;
return;
}
if (*avg_rtt == 0) {
// Initialize.
*avg_rtt = cur_rtt_ms;
return;
}
*avg_rtt = *avg_rtt * (1.0f - kWeightFactor) + cur_rtt_ms * kWeightFactor;
}
} // namespace
class RtcpObserver : public RtcpRttStats {
public:
explicit RtcpObserver(CallStats* owner) : owner_(owner) {}
virtual ~RtcpObserver() {}
virtual void OnRttUpdate(int64_t rtt) {
owner_->OnRttUpdate(rtt);
}
// Returns the average RTT.
virtual int64_t LastProcessedRtt() const {
return owner_->avg_rtt_ms();
}
private:
CallStats* owner_;
RTC_DISALLOW_COPY_AND_ASSIGN(RtcpObserver);
};
CallStats::CallStats()
: crit_(CriticalSectionWrapper::CreateCriticalSection()),
rtcp_rtt_stats_(new RtcpObserver(this)),
last_process_time_(TickTime::MillisecondTimestamp()),
max_rtt_ms_(0),
avg_rtt_ms_(0) {
}
CallStats::~CallStats() {
assert(observers_.empty());
}
int64_t CallStats::TimeUntilNextProcess() {
return last_process_time_ + kUpdateIntervalMs -
TickTime::MillisecondTimestamp();
}
int32_t CallStats::Process() {
CriticalSectionScoped cs(crit_.get());
int64_t now = TickTime::MillisecondTimestamp();
if (now < last_process_time_ + kUpdateIntervalMs)
return 0;
last_process_time_ = now;
RemoveOldReports(now, &reports_);
max_rtt_ms_ = GetMaxRttMs(&reports_);
UpdateAvgRttMs(&reports_, &avg_rtt_ms_);
// If there is a valid rtt, update all observers with the max rtt.
// TODO(asapersson): Consider changing this to report the average rtt.
if (max_rtt_ms_ > 0) {
for (std::list<CallStatsObserver*>::iterator it = observers_.begin();
it != observers_.end(); ++it) {
(*it)->OnRttUpdate(avg_rtt_ms_, max_rtt_ms_);
}
}
return 0;
}
int64_t CallStats::avg_rtt_ms() const {
CriticalSectionScoped cs(crit_.get());
return avg_rtt_ms_;
}
RtcpRttStats* CallStats::rtcp_rtt_stats() const {
return rtcp_rtt_stats_.get();
}
void CallStats::RegisterStatsObserver(CallStatsObserver* observer) {
CriticalSectionScoped cs(crit_.get());
for (std::list<CallStatsObserver*>::iterator it = observers_.begin();
it != observers_.end(); ++it) {
if (*it == observer)
return;
}
observers_.push_back(observer);
}
void CallStats::DeregisterStatsObserver(CallStatsObserver* observer) {
CriticalSectionScoped cs(crit_.get());
for (std::list<CallStatsObserver*>::iterator it = observers_.begin();
it != observers_.end(); ++it) {
if (*it == observer) {
observers_.erase(it);
return;
}
}
}
void CallStats::OnRttUpdate(int64_t rtt) {
CriticalSectionScoped cs(crit_.get());
reports_.push_back(RttTime(rtt, TickTime::MillisecondTimestamp()));
}
} // namespace webrtc
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