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RTC: 修复twcc rtp ext seq回退处理逻辑bug

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This commit is contained in:
xiongziliang 2021-11-27 22:20:22 +08:00
parent 8b3a5dda1c
commit 8a1f979375
1 changed files with 19 additions and 6 deletions
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23
webrtc/TwccContext.cpp
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@ -21,7 +21,7 @@ enum class ExtSeqStatus : int {
void TwccContext::onRtp(uint32_t ssrc, uint16_t twcc_ext_seq, uint64_t stamp_ms) {
switch ((ExtSeqStatus) checkSeqStatus(twcc_ext_seq)) {
case ExtSeqStatus::jumped: /*回环后，收到回环前的大ext seq包,过滤掉*/ return;
case ExtSeqStatus::jumped: /*seq异常,过滤掉*/ return;
case ExtSeqStatus::looped: /*回环，触发发送twcc rtcp*/ onSendTwcc(ssrc); break;
case ExtSeqStatus::normal: break;
default: /*不可达*/assert(0); break;
@ -56,17 +56,30 @@ int TwccContext::checkSeqStatus(uint16_t twcc_ext_seq) const {
return (int) ExtSeqStatus::normal;
}
auto max = _rtp_recv_status.rbegin()->first;
if (max > 0xFF00 && twcc_ext_seq < 0xFF) {
//发生回环了
auto delta = (int32_t) twcc_ext_seq - (int32_t) max;
if (delta > 0 && delta < 0xFFFF / 2) {
//正常增长
return (int) ExtSeqStatus::normal;
}
if (delta < -0xFF00) {
//回环
TraceL << "rtp twcc ext seq looped:" << max << " -> " << twcc_ext_seq;
return (int) ExtSeqStatus::looped;
}
if (twcc_ext_seq - max > 0xFFFF / 2) {
TraceL << "rtp twcc ext seq jumped:" << max << " -> " << twcc_ext_seq;
if (delta > 0xFF00) {
//回环后收到前面大的乱序的包，无法处理，丢弃
TraceL << "rtp twcc ext seq jumped after looped:" << max << " -> " << twcc_ext_seq;
return (int) ExtSeqStatus::jumped;
}
auto min = _rtp_recv_status.begin()->first;
if (min <= twcc_ext_seq || twcc_ext_seq <= max) {
//正常回退
return (int) ExtSeqStatus::normal;
}
//seq莫名的大幅增加或减少，无法处理，丢弃
TraceL << "rtp twcc ext seq jumped:" << max << " -> " << twcc_ext_seq;
return (int) ExtSeqStatus::jumped;
}
void TwccContext::onSendTwcc(uint32_t ssrc) {
auto max = _rtp_recv_status.rbegin()->first;