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prevent pkt seq cycle and time stamp cycle

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This commit is contained in:
xiongguangjie 2022-06-04 22:09:56 +08:00
parent 71ce31d5c0
commit adaffcc245
3 changed files with 38 additions and 68 deletions
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65
srt/PacketQueue.cpp
View File

@ -1,6 +1,10 @@
#include "PacketQueue.hpp"
namespace SRT {
inline uint32_t genExpectedSeq(uint32_t seq){
return 0x7fffffff&seq;
}
PacketQueue::PacketQueue(uint32_t max_size, uint32_t init_seq, uint32_t lantency)
: _pkt_expected_seq(init_seq)
, _pkt_cap(max_size)
@ -23,28 +27,29 @@ std::list<DataPacket::Ptr> PacketQueue::tryGetPacket() {
auto it = _pkt_map.find(_pkt_expected_seq);
while ( it != _pkt_map.end()) {
re.push_back(it->second);
_last_pop_ts = it->second->get_ts;
_pkt_map.erase(it);
_pkt_expected_seq++;
_pkt_expected_seq = genExpectedSeq(_pkt_expected_seq+1);
it = _pkt_map.find(_pkt_expected_seq);
}
while (_pkt_map.size() > _pkt_cap) {
// force pop some packet
it = _pkt_map.begin();
// 防止回环
it = _pkt_map.find(_pkt_expected_seq);
if(it != _pkt_map.end()){
re.push_back(it->second);
_last_pop_ts = it->second->get_ts;
_pkt_expected_seq = it->second->packet_seq_number + 1;
_pkt_map.erase(it);
}
_pkt_expected_seq = genExpectedSeq(_pkt_expected_seq + 1);
}
while (timeLantency() > _pkt_lantency) {
auto it = _pkt_map.begin();
it = _pkt_map.find(_pkt_expected_seq);
if(it != _pkt_map.end()){
re.push_back(it->second);
_last_pop_ts = it->second->get_ts;
_pkt_expected_seq = it->second->packet_seq_number + 1;
_pkt_map.erase(it);
}
_pkt_expected_seq = genExpectedSeq(_pkt_expected_seq + 1);
}
return re;
}
@ -61,7 +66,7 @@ bool PacketQueue::dropForRecv(uint32_t first,uint32_t last){
_pkt_map.erase(i);
}
}
_pkt_expected_seq = last+1;
_pkt_expected_seq =genExpectedSeq(last+1);
return true;
}
@ -76,11 +81,10 @@ bool PacketQueue::dropForSend(uint32_t num){
for(uint32_t i =_pkt_expected_seq;i< num;++i){
it = _pkt_map.find(i);
if(it != _pkt_map.end()){
_last_pop_ts = it->second->get_ts;
_pkt_map.erase(it);
}
}
_pkt_expected_seq = num;
_pkt_expected_seq =genExpectedSeq(num);
return true;
}
@ -91,33 +95,26 @@ DataPacket::Ptr PacketQueue::findPacketBySeq(uint32_t seq){
}
return nullptr;
}
uint32_t PacketQueue::timeLantencyFrom(TimePoint now){
return DurationCountMicroseconds(now - _last_pop_ts);
}
std::list<DataPacket::Ptr> PacketQueue::tryGetPacketByNow(TimePoint now){
std::list<DataPacket::Ptr> re;
auto it = _pkt_map.begin();
while(it !=_pkt_map.end()){
if(DurationCountMicroseconds(now-it->second->get_ts)>=_pkt_lantency){
re.push_back(it->second);
_pkt_expected_seq = it->second->packet_seq_number+1;
_last_pop_ts = it->second->get_ts;
_pkt_map.erase(it);
}
it++;
}
return re;
}
uint32_t PacketQueue::timeLantency() {
if (_pkt_map.empty()) {
return 0;
}
auto first = _pkt_map.begin()->second;
auto last = _pkt_map.rbegin()->second;
auto first = _pkt_map.begin()->second->timestamp;
auto last = _pkt_map.rbegin()->second->timestamp;
uint32_t dur;
if(last>first){
dur = last - first;
}else{
dur = first - last;
}
return last->timestamp - first->timestamp;
if(dur > 0x80000000){
dur = 0xffffffff - dur;
}
return dur;
}
std::list<PacketQueue::LostPair> PacketQueue::getLostSeq() {
@ -136,7 +133,7 @@ std::list<PacketQueue::LostPair> PacketQueue::getLostSeq() {
uint32_t i = _pkt_expected_seq;
bool finish = true;
for(i = _pkt_expected_seq;i<=_pkt_map.rbegin()->first;++i){
for(i = _pkt_expected_seq;i<=_pkt_map.rbegin()->first;){
if(_pkt_map.find(i) == _pkt_map.end()){
if(finish){
finish = false;
@ -152,6 +149,7 @@ std::list<PacketQueue::LostPair> PacketQueue::getLostSeq() {
re.push_back(lost);
}
}
i = genExpectedSeq(i+1);
}
return re;
@ -175,4 +173,5 @@ size_t PacketQueue::getAvailableBufferSize(){
uint32_t PacketQueue::getExpectedSeq(){
return _pkt_expected_seq;
}
} // namespace SRT

6
srt/PacketQueue.hpp
View File

@ -21,8 +21,6 @@ public:
bool inputPacket(DataPacket::Ptr pkt);
std::list<DataPacket::Ptr> tryGetPacket();
uint32_t timeLantency();
uint32_t timeLantencyFrom(TimePoint now);
std::list<DataPacket::Ptr> tryGetPacketByNow(TimePoint now);
std::list<LostPair> getLostSeq();
size_t getSize();
@ -35,8 +33,6 @@ public:
bool dropForSend(uint32_t num);
DataPacket::Ptr findPacketBySeq(uint32_t seq);
private:
std::map<uint32_t,DataPacket::Ptr> _pkt_map;
@ -44,7 +40,7 @@ private:
uint32_t _pkt_cap;
uint32_t _pkt_lantency;
TimePoint _last_pop_ts;
};
}

27
srt/SrtTransport.cpp
View File

@ -210,31 +210,6 @@ void SrtTransport::handleHandshakeConclusion(HandshakePacket &pkt, struct sockad
_last_ack_pkt_seq_num = _init_seq_number;
}
void SrtTransport::bufCheckInterval(){
if(isPusher()){
if(_recv_buf->timeLantencyFrom(_now) > (_buf_delay*1e6)){
auto list = _recv_buf->tryGetPacketByNow(_now);
for(auto data : list){
onSRTData(std::move(data));
}
if(!list.empty()){
sendACKPacket();
_light_ack_pkt_count = 0;
_ack_ticker.resetTime(_now);
}
auto nak_interval = (_rtt+_rtt_variance*4)/2;
if(nak_interval >= 20*1000){
nak_interval = 20*1000;
}
if(_nak_ticker.elapsedTime(_now)>nak_interval || list.empty()){
auto lost = _recv_buf->getLostSeq();
if(!lost.empty()){
sendNAKPacket(lost);
}
_nak_ticker.resetTime(_now);
}
}
}
}
void SrtTransport::handleHandshake(uint8_t *buf, int len, struct sockaddr_storage *addr){
HandshakePacket pkt;
@ -454,7 +429,7 @@ void SrtTransport::handleDataPacket(uint8_t *buf, int len, struct sockaddr_stora
}
_light_ack_pkt_count++;
bufCheckInterval();
//bufCheckInterval();
}
void SrtTransport::sendDataPacket(DataPacket::Ptr pkt,char* buf,int len, bool flush) {