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SRT: Build SRT from source by SRS. 4.0.115

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hondaxiao 2021-05-15 19:18:39 +08:00 • committed by winlin
parent 262f0fc8c8
commit 90f1b482ab
115 changed files with 44513 additions and 19 deletions
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/*
* SRT - Secure, Reliable, Transport
* Copyright (c) 2018 Haivision Systems Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
// This is a controversial thing, so temporarily blocking
//#define SRT_ENABLE_SYSTEMBUFFER_TRACE
#ifdef SRT_ENABLE_SYSTEMBUFFER_TRACE
#if defined(unix)
// XXX will be nonportable
#include <sys/ioctl.h>
#endif
#endif
#include <string>
#include <cmath>
#include "common.h"
#include "core.h"
#include "queue.h"
#include "packet.h"
#include "congctl.h"
#include "logging.h"
using namespace std;
using namespace srt_logging;
SrtCongestionControlBase::SrtCongestionControlBase(CUDT* parent)
{
m_parent = parent;
m_dMaxCWndSize = m_parent->flowWindowSize();
// RcvRate (deliveryRate()), RTT and Bandwidth can be read directly from CUDT when needed.
m_dCWndSize = 1000;
m_dPktSndPeriod = 1;
}
void SrtCongestion::Check()
{
if (!congctl)
throw CUDTException(MJ_CONNECTION, MN_NOCONN, 0);
}
// Useful macro to shorthand passing a method as argument
// Requires "Me" name by which a class refers to itself
#define SSLOT(method) EventSlot(this, &Me:: method)
class LiveCC: public SrtCongestionControlBase
{
int64_t m_llSndMaxBW; //Max bandwidth (bytes/sec)
size_t m_zSndAvgPayloadSize; //Average Payload Size of packets to xmit
size_t m_zMaxPayloadSize;
// NAKREPORT stuff.
int m_iMinNakInterval_us; // Minimum NAK Report Period (usec)
int m_iNakReportAccel; // NAK Report Period (RTT) accelerator
typedef LiveCC Me; // required for SSLOT macro
public:
LiveCC(CUDT* parent)
: SrtCongestionControlBase(parent)
{
m_llSndMaxBW = BW_INFINITE; // 1 Gbbps in Bytes/sec BW_INFINITE
m_zMaxPayloadSize = parent->OPT_PayloadSize();
if ( m_zMaxPayloadSize == 0 )
m_zMaxPayloadSize = parent->maxPayloadSize();
m_zSndAvgPayloadSize = m_zMaxPayloadSize;
m_iMinNakInterval_us = 20000; //Minimum NAK Report Period (usec)
m_iNakReportAccel = 2; //Default NAK Report Period (RTT) accelerator
HLOGC(cclog.Debug, log << "Creating LiveCC: bw=" << m_llSndMaxBW << " avgplsize=" << m_zSndAvgPayloadSize);
updatePktSndPeriod();
// NOTE: TEV_SEND gets dispatched from Sending thread, all others
// from receiving thread.
parent->ConnectSignal(TEV_SEND, SSLOT(updatePayloadSize));
/*
* Readjust the max SndPeriod onACK (and onTimeout)
*/
parent->ConnectSignal(TEV_CHECKTIMER, SSLOT(updatePktSndPeriod_onTimer));
parent->ConnectSignal(TEV_ACK, SSLOT(updatePktSndPeriod_onAck));
}
bool checkTransArgs(SrtCongestion::TransAPI api, SrtCongestion::TransDir dir, const char* , size_t size, int , bool ) ATR_OVERRIDE
{
if (api != SrtCongestion::STA_MESSAGE)
{
LOGC(cclog.Error, log << "LiveCC: invalid API use. Only sendmsg/recvmsg allowed.");
return false;
}
if (dir == SrtCongestion::STAD_SEND)
{
// For sending, check if the size of data doesn't exceed the maximum live packet size.
if (size > m_zMaxPayloadSize)
{
LOGC(cclog.Error, log << "LiveCC: payload size: " << size << " exceeds maximum allowed " << m_zMaxPayloadSize);
return false;
}
}
else
{
// For receiving, check if the buffer has enough space to keep the payload.
if (size < m_zMaxPayloadSize)
{
LOGC(cclog.Error, log << "LiveCC: buffer size: " << size << " is too small for the maximum possible " << m_zMaxPayloadSize);
return false;
}
}
return true;
}
// XXX You can decide here if the not-fully-packed packet should require immediate ACK or not.
// bool needsQuickACK(const CPacket& pkt) ATR_OVERRIDE
virtual int64_t sndBandwidth() ATR_OVERRIDE { return m_llSndMaxBW; }
private:
// SLOTS:
// TEV_SEND -> CPacket*.
void updatePayloadSize(ETransmissionEvent, EventVariant var)
{
const CPacket& packet = *var.get<EventVariant::PACKET>();
// XXX NOTE: TEV_SEND is sent from CSndQueue::worker thread, which is
// different to threads running any other events (TEV_CHECKTIMER and TEV_ACK).
// The m_zSndAvgPayloadSize field is however left unguarded because
// there's no other modifier of this field.
// Worst case scenario, the procedure running in CRcvQueue::worker
// thread will pick up a "slightly outdated" average value from this
// field - this is insignificant.
m_zSndAvgPayloadSize = avg_iir<128, size_t>(m_zSndAvgPayloadSize, packet.getLength());
HLOGC(cclog.Debug, log << "LiveCC: avg payload size updated: " << m_zSndAvgPayloadSize);
}
void updatePktSndPeriod_onTimer(ETransmissionEvent , EventVariant var)
{
if ( var.get<EventVariant::STAGE>() != TEV_CHT_INIT )
updatePktSndPeriod();
}
void updatePktSndPeriod_onAck(ETransmissionEvent , EventVariant )
{
updatePktSndPeriod();
}
void updatePktSndPeriod()
{
// packet = payload + header
const double pktsize = (double) m_zSndAvgPayloadSize + CPacket::SRT_DATA_HDR_SIZE;
m_dPktSndPeriod = 1000 * 1000.0 * (pktsize / m_llSndMaxBW);
HLOGC(cclog.Debug, log << "LiveCC: sending period updated: " << m_dPktSndPeriod
<< " (pktsize=" << pktsize << ", bw=" << m_llSndMaxBW);
}
void setMaxBW(int64_t maxbw)
{
m_llSndMaxBW = maxbw > 0 ? maxbw : BW_INFINITE;
updatePktSndPeriod();
#ifdef SRT_ENABLE_NOCWND
/*
* UDT default flow control should not trigger under normal SRT operation
* UDT stops sending if the number of packets in transit (not acknowledged)
* is larger than the congestion window.
* Up to SRT 1.0.6, this value was set at 1000 pkts, which may be insufficient
* for satellite links with ~1000 msec RTT and high bit rate.
*/
// XXX Consider making this a socket option.
m_dCWndSize = m_dMaxCWndSize;
#else
m_dCWndSize = 1000;
#endif
}
void updateBandwidth(int64_t maxbw, int64_t bw) ATR_OVERRIDE
{
// bw is the bandwidth calculated with regard to the
// SRTO_INPUTBW and SRTO_OHEADBW parameters. The maxbw
// value simply represents the SRTO_MAXBW setting.
if (maxbw)
{
setMaxBW(maxbw);
return;
}
if (bw == 0)
{
return;
}
setMaxBW(bw);
}
SrtCongestion::RexmitMethod rexmitMethod() ATR_OVERRIDE
{
return SrtCongestion::SRM_FASTREXMIT;
}
uint64_t updateNAKInterval(uint64_t nakint_tk, int /*rcv_speed*/, size_t /*loss_length*/) ATR_OVERRIDE
{
/*
* duB:
* The RTT accounts for the time for the last NAK to reach sender and start resending lost pkts.
* The rcv_speed add the time to resend all the pkts in the loss list.
*
* For realtime Transport Stream content, pkts/sec is not a good indication of time to transmit
* since packets are not filled to m_iMSS and packet size average is lower than (7*188)
* for low bit rates.
* If NAK report is lost, another cycle (RTT) is requred which is bad for low latency so we
* accelerate the NAK Reports frequency, at the cost of possible duplicate resend.
* Finally, the UDT4 native minimum NAK interval (m_ullMinNakInt_tk) is 300 ms which is too high
* (~10 i30 video frames) to maintain low latency.
*/
// Note: this value will still be reshaped to defined minimum,
// as per minNAKInterval.
return nakint_tk / m_iNakReportAccel;
}
uint64_t minNAKInterval() ATR_OVERRIDE
{
return m_iMinNakInterval_us * CTimer::getCPUFrequency();
}
};
class FileCC : public SrtCongestionControlBase
{
typedef FileCC Me; // Required by SSLOT macro
// Fields from CUDTCC
int m_iRCInterval; // UDT Rate control interval
uint64_t m_LastRCTime; // last rate increase time
bool m_bSlowStart; // if in slow start phase
int32_t m_iLastAck; // last ACKed seq no
bool m_bLoss; // if loss happened since last rate increase
int32_t m_iLastDecSeq; // max pkt seq no sent out when last decrease happened
double m_dLastDecPeriod; // value of pktsndperiod when last decrease happened
int m_iNAKCount; // NAK counter
int m_iDecRandom; // random threshold on decrease by number of loss events
int m_iAvgNAKNum; // average number of NAKs per congestion
int m_iDecCount; // number of decreases in a congestion epoch
int64_t m_maxSR;
public:
FileCC(CUDT* parent)
: SrtCongestionControlBase(parent)
, m_iRCInterval(CUDT::COMM_SYN_INTERVAL_US)
, m_LastRCTime(CTimer::getTime())
, m_bSlowStart(true)
, m_iLastAck(parent->sndSeqNo())
, m_bLoss(false)
, m_iLastDecSeq(CSeqNo::decseq(m_iLastAck))
, m_dLastDecPeriod(1)
, m_iNAKCount(0)
, m_iDecRandom(1)
, m_iAvgNAKNum(0)
, m_iDecCount(0)
, m_maxSR(0)
{
// Note that this function is called at the moment of
// calling m_Smoother.configure(this). It is placed more less
// at the same position as the series-of-parameter-setting-then-init
// in the original UDT code. So, old CUDTCC::init() can be moved
// to constructor.
// SmotherBase
m_dCWndSize = 16;
m_dPktSndPeriod = 1;
parent->ConnectSignal(TEV_ACK, SSLOT(updateSndPeriod));
parent->ConnectSignal(TEV_LOSSREPORT, SSLOT(slowdownSndPeriod));
parent->ConnectSignal(TEV_CHECKTIMER, SSLOT(speedupToWindowSize));
HLOGC(cclog.Debug, log << "Creating FileCC");
}
bool checkTransArgs(SrtCongestion::TransAPI, SrtCongestion::TransDir, const char*, size_t, int, bool) ATR_OVERRIDE
{
// XXX
// The FileCC has currently no restrictions, although it should be
// rather required that the "message" mode or "buffer" mode be used on both sides the same.
// This must be somehow checked separately.
return true;
}
bool needsQuickACK(const CPacket& pkt) ATR_OVERRIDE
{
// For FileCC, treat non-full-buffer situation as an end-of-message situation;
// request ACK to be sent immediately.
if (pkt.getLength() < m_parent->maxPayloadSize())
{
// This is not a regular fixed size packet...
// an irregular sized packet usually indicates the end of a message, so send an ACK immediately
return true;
}
return false;
}
void updateBandwidth(int64_t maxbw, int64_t) ATR_OVERRIDE
{
if (maxbw != 0)
{
m_maxSR = maxbw;
HLOGC(cclog.Debug, log << "FileCC: updated BW: " << m_maxSR);
}
}
private:
// SLOTS
void updateSndPeriod(ETransmissionEvent, EventVariant arg)
{
const int ack = arg.get<EventVariant::ACK>();
const uint64_t currtime = CTimer::getTime();
if (currtime - m_LastRCTime < (uint64_t)m_iRCInterval)
return;
m_LastRCTime = currtime;
if (m_bSlowStart)
{
m_dCWndSize += CSeqNo::seqlen(m_iLastAck, ack);
m_iLastAck = ack;
if (m_dCWndSize > m_dMaxCWndSize)
{
m_bSlowStart = false;
if (m_parent->deliveryRate() > 0)
{
m_dPktSndPeriod = 1000000.0 / m_parent->deliveryRate();
HLOGC(cclog.Debug, log << "FileCC: UPD (slowstart:ENDED) wndsize="
<< m_dCWndSize << "/" << m_dMaxCWndSize
<< " sndperiod=" << m_dPktSndPeriod << "us = 1M/("
<< m_parent->deliveryRate() << " pkts/s)");
}
else
{
m_dPktSndPeriod = m_dCWndSize / (m_parent->RTT() + m_iRCInterval);
HLOGC(cclog.Debug, log << "FileCC: UPD (slowstart:ENDED) wndsize="
<< m_dCWndSize << "/" << m_dMaxCWndSize
<< " sndperiod=" << m_dPktSndPeriod << "us = wndsize/(RTT+RCIV) RTT="
<< m_parent->RTT() << " RCIV=" << m_iRCInterval);
}
}
else
{
HLOGC(cclog.Debug, log << "FileCC: UPD (slowstart:KEPT) wndsize="
<< m_dCWndSize << "/" << m_dMaxCWndSize
<< " sndperiod=" << m_dPktSndPeriod << "us");
}
}
else
{
m_dCWndSize = m_parent->deliveryRate() / 1000000.0 * (m_parent->RTT() + m_iRCInterval) + 16;
HLOGC(cclog.Debug, log << "FileCC: UPD (speed mode) wndsize="
<< m_dCWndSize << "/" << m_dMaxCWndSize << " RTT = " << m_parent->RTT()
<< " sndperiod=" << m_dPktSndPeriod << "us. deliverRate = "
<< m_parent->deliveryRate() << " pkts/s)");
}
if (!m_bSlowStart)
{
if (m_bLoss)
{
m_bLoss = false;
}
// During Slow Start, no rate increase
else
{
double inc = 0;
const int loss_bw = 2 * (1000000 / m_dLastDecPeriod); // 2 times last loss point
const int bw_pktps = min(loss_bw, m_parent->bandwidth());
int64_t B = (int64_t)(bw_pktps - 1000000.0 / m_dPktSndPeriod);
if ((m_dPktSndPeriod > m_dLastDecPeriod) && ((bw_pktps / 9) < B))
B = bw_pktps / 9;
if (B <= 0)
inc = 1.0 / m_parent->MSS();
else
{
// inc = max(10 ^ ceil(log10( B * MSS * 8 ) * Beta / MSS, 1/MSS)
// Beta = 1.5 * 10^(-6)
inc = pow(10.0, ceil(log10(B * m_parent->MSS() * 8.0))) * 0.0000015 / m_parent->MSS();
inc = max(inc, 1.0 / m_parent->MSS());
}
HLOGC(cclog.Debug, log << "FileCC: UPD (slowstart:OFF) loss_bw=" << loss_bw
<< " bandwidth=" << m_parent->bandwidth() << " inc=" << inc
<< " m_dPktSndPeriod=" << m_dPktSndPeriod
<< "->" << (m_dPktSndPeriod * m_iRCInterval) / (m_dPktSndPeriod * inc + m_iRCInterval));
m_dPktSndPeriod = (m_dPktSndPeriod * m_iRCInterval) / (m_dPktSndPeriod * inc + m_iRCInterval);
}
}
#if ENABLE_HEAVY_LOGGING
// Try to do reverse-calculation for m_dPktSndPeriod, as per minSP below
// sndperiod = mega / (maxbw / MSS)
// 1/sndperiod = (maxbw/MSS) / mega
// mega/sndperiod = maxbw/MSS
// maxbw = (MSS*mega)/sndperiod
uint64_t usedbw = (m_parent->MSS() * 1000000.0) / m_dPktSndPeriod;
#if defined(unix) && defined (SRT_ENABLE_SYSTEMBUFFER_TRACE)
// Check the outgoing system queue level
int udp_buffer_size = m_parent->sndQueue()->sockoptQuery(SOL_SOCKET, SO_SNDBUF);
int udp_buffer_level = m_parent->sndQueue()->ioctlQuery(TIOCOUTQ);
int udp_buffer_free = udp_buffer_size - udp_buffer_level;
#else
int udp_buffer_free = -1;
#endif
HLOGC(cclog.Debug, log << "FileCC: UPD (slowstart:"
<< (m_bSlowStart ? "ON" : "OFF") << ") wndsize=" << m_dCWndSize
<< " sndperiod=" << m_dPktSndPeriod << "us BANDWIDTH USED:" << usedbw << " (limit: " << m_maxSR << ")"
" SYSTEM BUFFER LEFT: " << udp_buffer_free);
#endif
//set maximum transfer rate
if (m_maxSR)
{
double minSP = 1000000.0 / (double(m_maxSR) / m_parent->MSS());
if (m_dPktSndPeriod < minSP)
{
m_dPktSndPeriod = minSP;
HLOGC(cclog.Debug, log << "FileCC: BW limited to " << m_maxSR
<< " - SLOWDOWN sndperiod=" << m_dPktSndPeriod << "us");
}
}
}
// When a lossreport has been received, it might be due to having
// reached the available bandwidth limit. Slowdown to avoid further losses.
void slowdownSndPeriod(ETransmissionEvent, EventVariant arg)
{
const int32_t* losslist = arg.get_ptr();
size_t losslist_size = arg.get_len();
// Sanity check. Should be impossible that TEV_LOSSREPORT event
// is called with a nonempty loss list.
if (losslist_size == 0)
{
LOGC(cclog.Error, log << "IPE: FileCC: empty loss list!");
return;
}
//Slow Start stopped, if it hasn't yet
if (m_bSlowStart)
{
m_bSlowStart = false;
if (m_parent->deliveryRate() > 0)
{
m_dPktSndPeriod = 1000000.0 / m_parent->deliveryRate();
HLOGC(cclog.Debug, log << "FileCC: LOSS, SLOWSTART:OFF, sndperiod=" << m_dPktSndPeriod << "us AS mega/rate (rate="
<< m_parent->deliveryRate() << ")");
}
else
{
m_dPktSndPeriod = m_dCWndSize / (m_parent->RTT() + m_iRCInterval);
HLOGC(cclog.Debug, log << "FileCC: LOSS, SLOWSTART:OFF, sndperiod=" << m_dPktSndPeriod << "us AS wndsize/(RTT+RCIV) (RTT="
<< m_parent->RTT() << " RCIV=" << m_iRCInterval << ")");
}
}
m_bLoss = true;
// TODO: const int pktsInFlight = CSeqNo::seqoff(m_iLastAck, m_parent->sndSeqNo());
const int pktsInFlight = m_parent->RTT() / m_dPktSndPeriod;
const int numPktsLost = m_parent->sndLossLength();
const int lost_pcent_x10 = pktsInFlight > 0 ? (numPktsLost * 1000) / pktsInFlight : 0;
HLOGC(cclog.Debug, log << "FileCC: LOSS: "
<< "sent=" << CSeqNo::seqlen(m_iLastAck, m_parent->sndSeqNo()) << ", inFlight=" << pktsInFlight
<< ", lost=" << numPktsLost << " ("
<< lost_pcent_x10 / 10 << "." << lost_pcent_x10 % 10 << "\%)");
if (lost_pcent_x10 < 20) // 2.0%
{
HLOGC(cclog.Debug, log << "FileCC: LOSS: m_dLastDecPeriod=" << m_dLastDecPeriod << "->" << m_dPktSndPeriod);
m_dLastDecPeriod = m_dPktSndPeriod;
return;
}
// In contradiction to UDT, TEV_LOSSREPORT will be reported also when
// the lossreport is being sent again, periodically, as a result of
// NAKREPORT feature. You should make sure that NAKREPORT is off when
// using FileCC, so relying on SRTO_TRANSTYPE rather than
// just SRTO_CONGESTION is recommended.
int32_t lossbegin = SEQNO_VALUE::unwrap(losslist[0]);
if (CSeqNo::seqcmp(lossbegin, m_iLastDecSeq) > 0)
{
m_dLastDecPeriod = m_dPktSndPeriod;
m_dPktSndPeriod = ceil(m_dPktSndPeriod * 1.03);
const double loss_share_factor = 0.03;
m_iAvgNAKNum = (int)ceil(m_iAvgNAKNum * (1 - loss_share_factor) + m_iNAKCount * loss_share_factor);
m_iNAKCount = 1;
m_iDecCount = 1;
m_iLastDecSeq = m_parent->sndSeqNo();
// remove global synchronization using randomization
srand(m_iLastDecSeq);
m_iDecRandom = (int)ceil(m_iAvgNAKNum * (double(rand()) / RAND_MAX));
if (m_iDecRandom < 1)
m_iDecRandom = 1;
HLOGC(cclog.Debug, log << "FileCC: LOSS:NEW lseqno=" << lossbegin
<< ", lastsentseqno=" << m_iLastDecSeq
<< ", seqdiff=" << CSeqNo::seqoff(m_iLastDecSeq, lossbegin)
<< ", rand=" << m_iDecRandom
<< " avg NAK:" << m_iAvgNAKNum
<< ", sndperiod=" << m_dPktSndPeriod << "us");
}
else if ((m_iDecCount++ < 5) && (0 == (++m_iNAKCount % m_iDecRandom)))
{
// 0.875^5 = 0.51, rate should not be decreased by more than half within a congestion period
m_dPktSndPeriod = ceil(m_dPktSndPeriod * 1.03);
m_iLastDecSeq = m_parent->sndSeqNo();
HLOGC(cclog.Debug, log << "FileCC: LOSS:PERIOD lseqno=" << lossbegin
<< ", lastsentseqno=" << m_iLastDecSeq
<< ", seqdiff=" << CSeqNo::seqoff(m_iLastDecSeq, lossbegin)
<< ", deccnt=" << m_iDecCount
<< ", decrnd=" << m_iDecRandom
<< ", sndperiod=" << m_dPktSndPeriod << "us");
}
else
{
HLOGC(cclog.Debug, log << "FileCC: LOSS:STILL lseqno=" << lossbegin
<< ", lastsentseqno=" << m_iLastDecSeq
<< ", seqdiff=" << CSeqNo::seqoff(m_iLastDecSeq, lossbegin)
<< ", deccnt=" << m_iDecCount
<< ", decrnd=" << m_iDecRandom
<< ", sndperiod=" << m_dPktSndPeriod << "us");
}
}
void speedupToWindowSize(ETransmissionEvent, EventVariant arg)
{
ECheckTimerStage stg = arg.get<EventVariant::STAGE>();
// TEV_INIT is in the beginning of checkTimers(), used
// only to synchronize back the values (which is done in updateCC
// after emitting the signal).
if (stg == TEV_CHT_INIT)
return;
if (m_bSlowStart)
{
m_bSlowStart = false;
if (m_parent->deliveryRate() > 0)
{
m_dPktSndPeriod = 1000000.0 / m_parent->deliveryRate();
HLOGC(cclog.Debug, log << "FileCC: CHKTIMER, SLOWSTART:OFF, sndperiod=" << m_dPktSndPeriod << "us AS mega/rate (rate="
<< m_parent->deliveryRate() << ")");
}
else
{
m_dPktSndPeriod = m_dCWndSize / (m_parent->RTT() + m_iRCInterval);
HLOGC(cclog.Debug, log << "FileCC: CHKTIMER, SLOWSTART:OFF, sndperiod=" << m_dPktSndPeriod << "us AS wndsize/(RTT+RCIV) (wndsize="
<< setprecision(6) << m_dCWndSize << " RTT=" << m_parent->RTT() << " RCIV=" << m_iRCInterval << ")");
}
}
else
{
// XXX This code is a copy of legacy CUDTCC::onTimeout() body.
// This part was commented out there already.
/*
m_dLastDecPeriod = m_dPktSndPeriod;
m_dPktSndPeriod = ceil(m_dPktSndPeriod * 2);
m_iLastDecSeq = m_iLastAck;
*/
}
}
SrtCongestion::RexmitMethod rexmitMethod() ATR_OVERRIDE
{
return SrtCongestion::SRM_LATEREXMIT;
}
};
#undef SSLOT
template <class Target>
struct Creator
{
static SrtCongestionControlBase* Create(CUDT* parent) { return new Target(parent); }
};
SrtCongestion::NamePtr SrtCongestion::congctls[N_CONTROLLERS] =
{
{"live", Creator<LiveCC>::Create },
{"file", Creator<FileCC>::Create }
};
bool SrtCongestion::configure(CUDT* parent)
{
if (selector == N_CONTROLLERS)
return false;
// Found a congctl, so call the creation function
congctl = (*congctls[selector].second)(parent);
// The congctl should have pinned in all events
// that are of its interest. It's stated that
// it's ready after creation.
return !!congctl;
}
SrtCongestion::~SrtCongestion()
{
delete congctl;
congctl = 0;
}