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修复rtp seq重复导致rtp nack重传列队异常的bug

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This commit is contained in:
xiongziliang 2022-02-27 02:07:25 +08:00
parent 7a5cf925b0
commit ba5ca8f5c7
3 changed files with 38 additions and 21 deletions
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44
webrtc/Nack.cpp
View File

@ -16,22 +16,22 @@ using namespace mediakit;
static constexpr uint32_t kMaxNackMS = 10 * 1000;
void NackList::push_back(RtpPacket::Ptr rtp) {
void NackList::pushBack(RtpPacket::Ptr rtp) {
auto seq = rtp->getSeq();
_nack_cache_seq.emplace_back(seq);
_nack_cache_pkt.emplace(seq, std::move(rtp));
while (get_cache_ms() > kMaxNackMS) {
while (getCacheMS() > kMaxNackMS) {
//需要清除部分nack缓存
pop_front();
popFront();
}
}
void NackList::for_each_nack(const FCI_NACK &nack, const function<void(const RtpPacket::Ptr &rtp)> &func) {
void NackList::forEach(const FCI_NACK &nack, const function<void(const RtpPacket::Ptr &rtp)> &func) {
auto seq = nack.getPid();
for (auto bit : nack.getBitArray()) {
if (bit) {
//丢包
RtpPacket::Ptr *ptr = get_rtp(seq);
RtpPacket::Ptr *ptr = getRtp(seq);
if (ptr) {
func(*ptr);
}
@ -40,7 +40,7 @@ void NackList::for_each_nack(const FCI_NACK &nack, const function<void(const Rtp
}
}
void NackList::pop_front() {
void NackList::popFront() {
if (_nack_cache_seq.empty()) {
return;
}
@ -48,7 +48,7 @@ void NackList::pop_front() {
_nack_cache_seq.pop_front();
}
RtpPacket::Ptr *NackList::get_rtp(uint16_t seq) {
RtpPacket::Ptr *NackList::getRtp(uint16_t seq) {
auto it = _nack_cache_pkt.find(seq);
if (it == _nack_cache_pkt.end()) {
return nullptr;
@ -56,19 +56,35 @@ RtpPacket::Ptr *NackList::get_rtp(uint16_t seq) {
return &it->second;
}
uint32_t NackList::get_cache_ms() {
if (_nack_cache_seq.size() < 2) {
uint32_t NackList::getCacheMS() {
auto back_stamp = getRtpStamp(_nack_cache_seq.back());
if (back_stamp == -1) {
_nack_cache_seq.pop_back();
return 0;
}
uint32_t back = _nack_cache_pkt[_nack_cache_seq.back()]->getStampMS(false);
uint32_t front = _nack_cache_pkt[_nack_cache_seq.front()]->getStampMS(false);
if (back >= front) {
return back - front;
auto front_stamp = getRtpStamp(_nack_cache_seq.front());
if (front_stamp == -1) {
_nack_cache_seq.pop_front();
return 0;
}
if (back_stamp >= front_stamp) {
return back_stamp - front_stamp;
}
//很有可能回环了
return back + (UINT32_MAX - front);
return back_stamp + (UINT32_MAX - front_stamp);
}
int64_t NackList::getRtpStamp(uint16_t seq) {
auto it = _nack_cache_pkt.find(seq);
if (it == _nack_cache_pkt.end()) {
return -1;
}
return it->second->getStampMS(false);
}
////////////////////////////////////////////////////////////////////////////////////////////////
void NackContext::received(uint16_t seq, bool is_rtx) {

11
webrtc/Nack.h
View File

@ -20,13 +20,14 @@ public:
NackList() = default;
~NackList() = default;
void push_back(mediakit::RtpPacket::Ptr rtp);
void for_each_nack(const mediakit::FCI_NACK &nack, const std::function<void(const mediakit::RtpPacket::Ptr &rtp)> &cb);
void pushBack(mediakit::RtpPacket::Ptr rtp);
void forEach(const mediakit::FCI_NACK &nack, const std::function<void(const mediakit::RtpPacket::Ptr &rtp)> &cb);
private:
void pop_front();
uint32_t get_cache_ms();
mediakit::RtpPacket::Ptr *get_rtp(uint16_t seq);
void popFront();
uint32_t getCacheMS();
int64_t getRtpStamp(uint16_t seq);
mediakit::RtpPacket::Ptr *getRtp(uint16_t seq);
private:
std::deque<uint16_t> _nack_cache_seq;

4
webrtc/WebRtcTransport.cpp
View File

@ -652,7 +652,7 @@ void WebRtcTransportImp::onRtcp(const char *buf, size_t len) {
}
auto &track = it->second;
auto &fci = fb->getFci<FCI_NACK>();
track->nack_list.for_each_nack(fci, [&](const RtpPacket::Ptr &rtp) {
track->nack_list.forEach(fci, [&](const RtpPacket::Ptr &rtp) {
//rtp重传
onSendRtp(rtp, true, true);
});
@ -807,7 +807,7 @@ void WebRtcTransportImp::onSendRtp(const RtpPacket::Ptr &rtp, bool flush, bool r
if (!rtx) {
//统计rtp发送情况，好做sr汇报
track->rtcp_context_send->onRtp(rtp->getSeq(), rtp->getStamp(), rtp->ntp_stamp, rtp->sample_rate, rtp->size() - RtpPacket::kRtpTcpHeaderSize);
track->nack_list.push_back(rtp);
track->nack_list.pushBack(rtp);
#if 0
//此处模拟发送丢包
if (rtp->type == TrackVideo && rtp->getSeq() % 100 == 0) {