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CongestionControl.cpp
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CongestionControl.cpp
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//
// libtgvoip is free and unencumbered public domain software.
// For more information, see http://unlicense.org or the UNLICENSE file
// you should have received with this source code distribution.
//
#include "CongestionControl.h"
#include "VoIPController.h"
#include "logging.h"
#include "VoIPServerConfig.h"
#include <math.h>
#include <assert.h>
using namespace tgvoip;
CCongestionControl::CCongestionControl(){
memset(rttHistory, 0, 100*sizeof(double));
memset(inflightPackets, 0, 100*sizeof(tgvoip_congestionctl_packet_t));
memset(inflightHistory, 0, 30*sizeof(size_t));
tmpRtt=0;
tmpRttCount=0;
rttHistorySize=0;
rttHistoryTop=0;
lastSentSeq=0;
inflightHistoryTop=0;
state=TGVOIP_CONCTL_STARTUP;
lastActionTime=0;
lastActionRtt=0;
stateTransitionTime=0;
inflightDataSize=0;
lossCount=0;
cwnd=(size_t) ServerConfig::GetSharedInstance()->GetInt("audio_congestion_window", 1024);
init_mutex(mutex);
}
CCongestionControl::~CCongestionControl(){
free_mutex(mutex);
}
size_t CCongestionControl::GetAcknowledgedDataSize(){
return 0;
}
double CCongestionControl::GetAverageRTT(){
if(rttHistorySize==0)
return 0;
double avg=0;
int i;
for(i=0;i<30 && i<rttHistorySize;i++){
int x=(rttHistoryTop-i-1)%100;
avg+=rttHistory[x>=0 ? x : (100+x)];
//LOGV("adding [%d] %f", x>=0 ? x : (100+x), rttHistory[x>=0 ? x : (100+x)]);
}
return avg/i;
}
size_t CCongestionControl::GetInflightDataSize(){
size_t avg=0;
int i;
for(i=0;i<30;i++){
avg+=inflightHistory[i];
}
return avg/30;
}
size_t CCongestionControl::GetCongestionWindow(){
return cwnd;
}
double CCongestionControl::GetMinimumRTT(){
int i;
double min=INFINITY;
for(i=0;i<100;i++){
if(rttHistory[i]>0 && rttHistory[i]<min)
min=rttHistory[i];
}
return min;
}
void CCongestionControl::PacketAcknowledged(uint32_t seq){
lock_mutex(mutex);
int i;
for(i=0;i<100;i++){
if(inflightPackets[i].seq==seq && inflightPackets[i].sendTime>0){
tmpRtt+=(VoIPController::GetCurrentTime()-inflightPackets[i].sendTime);
tmpRttCount++;
inflightPackets[i].sendTime=0;
inflightDataSize-=inflightPackets[i].size;
break;
}
}
unlock_mutex(mutex);
}
void CCongestionControl::PacketSent(uint32_t seq, size_t size){
if(!seqgt(seq, lastSentSeq) || seq==lastSentSeq){
LOGW("Duplicate outgoing seq %u", seq);
return;
}
lastSentSeq=seq;
lock_mutex(mutex);
double smallestSendTime=INFINITY;
tgvoip_congestionctl_packet_t* slot=NULL;
int i;
for(i=0;i<100;i++){
if(inflightPackets[i].sendTime==0){
slot=&inflightPackets[i];
break;
}
if(smallestSendTime>inflightPackets[i].sendTime){
slot=&inflightPackets[i];
smallestSendTime=slot->sendTime;
}
}
assert(slot!=NULL);
if(slot->sendTime>0){
inflightDataSize-=slot->size;
lossCount++;
LOGD("Packet with seq %u was not acknowledged", slot->seq);
}
slot->seq=seq;
slot->size=size;
slot->sendTime=VoIPController::GetCurrentTime();
inflightDataSize+=size;
unlock_mutex(mutex);
}
void CCongestionControl::Tick(){
tickCount++;
lock_mutex(mutex);
if(tmpRttCount>0){
rttHistory[rttHistoryTop]=tmpRtt/tmpRttCount;
rttHistoryTop=(rttHistoryTop+1)%100;
if(rttHistorySize<100)
rttHistorySize++;
tmpRtt=0;
tmpRttCount=0;
}
int i;
for(i=0;i<100;i++){
if(inflightPackets[i].sendTime!=0 && VoIPController::GetCurrentTime()-inflightPackets[i].sendTime>2){
inflightPackets[i].sendTime=0;
inflightDataSize-=inflightPackets[i].size;
lossCount++;
LOGD("Packet with seq %u was not acknowledged", inflightPackets[i].seq);
}
}
inflightHistory[inflightHistoryTop]=inflightDataSize;
inflightHistoryTop=(inflightHistoryTop+1)%30;
unlock_mutex(mutex);
}
int CCongestionControl::GetBandwidthControlAction(){
if(VoIPController::GetCurrentTime()-lastActionTime<1)
return TGVOIP_CONCTL_ACT_NONE;
size_t inflightAvg=GetInflightDataSize();
size_t max=cwnd+cwnd/10;
size_t min=cwnd-cwnd/10;
if(inflightAvg<min){
lastActionTime=VoIPController::GetCurrentTime();
return TGVOIP_CONCTL_ACT_INCREASE;
}
if(inflightAvg>max){
lastActionTime=VoIPController::GetCurrentTime();
return TGVOIP_CONCTL_ACT_DECREASE;
}
return TGVOIP_CONCTL_ACT_NONE;
}
uint32_t CCongestionControl::GetSendLossCount(){
return lossCount;
}