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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/interface/critical_section_wrapper.h"
#include "webrtc/system_wrappers/interface/tick_util.h"
namespace webrtc {
// A rtt report is considered valid for this long.
const int kRttTimeoutMs = 1500;
// Time interval for updating the observers.
const int kUpdateIntervalMs = 1000;
class RtcpObserver : public RtcpRttStats {
public:
explicit RtcpObserver(CallStats* owner) : owner_(owner) {}
virtual ~RtcpObserver() {}
virtual void OnRttUpdate(uint32_t rtt) {
owner_->OnRttUpdate(rtt);
}
virtual uint32_t LastProcessedRtt() const {
return owner_->last_processed_rtt_ms();
}
private:
CallStats* owner_;
DISALLOW_COPY_AND_ASSIGN(RtcpObserver);
};
CallStats::CallStats()
: crit_(CriticalSectionWrapper::CreateCriticalSection()),
rtcp_rtt_stats_(new RtcpObserver(this)),
last_process_time_(TickTime::MillisecondTimestamp()),
last_processed_rtt_ms_(0) {
}
CallStats::~CallStats() {
assert(observers_.empty());
}
int32_t CallStats::TimeUntilNextProcess() {
return last_process_time_ + kUpdateIntervalMs -
TickTime::MillisecondTimestamp();
}
int32_t CallStats::Process() {
CriticalSectionScoped cs(crit_.get());
if (TickTime::MillisecondTimestamp() < last_process_time_ + kUpdateIntervalMs)
return 0;
// Remove invalid, as in too old, rtt values.
int64_t time_now = TickTime::MillisecondTimestamp();
while (!reports_.empty() && reports_.front().time + kRttTimeoutMs <
time_now) {
reports_.pop_front();
}
// Find the max stored RTT.
uint32_t max_rtt = 0;
for (std::list<RttTime>::const_iterator it = reports_.begin();
it != reports_.end(); ++it) {
if (it->rtt > max_rtt)
max_rtt = it->rtt;
}
// If there is a valid rtt, update all observers.
if (max_rtt > 0) {
for (std::list<CallStatsObserver*>::iterator it = observers_.begin();
it != observers_.end(); ++it) {
(*it)->OnRttUpdate(max_rtt);
}
}
last_processed_rtt_ms_ = max_rtt;
last_process_time_ = time_now;
return 0;
}
uint32_t CallStats::last_processed_rtt_ms() const {
CriticalSectionScoped cs(crit_.get());
return last_processed_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(uint32_t rtt) {
CriticalSectionScoped cs(crit_.get());
int64_t time_now = TickTime::MillisecondTimestamp();
reports_.push_back(RttTime(rtt, time_now));
}
} // namespace webrtc
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