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For #3167: WebRTC: Refine sequence jitter algorithm. v4.0.266

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This commit is contained in:
winlin 2022-09-27 14:53:05 +08:00
parent 0e68dc2939
commit 386b92e9ab
5 changed files with 199 additions and 55 deletions
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67
trunk/src/app/srs_app_rtc_source.cpp
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@ -2546,40 +2546,35 @@ srs_error_t SrsRtcVideoRecvTrack::check_send_nacks()
return err;
}
SrsRtcJitter::SrsRtcJitter(uint32_t base)
SrsRtcTsJitter::SrsRtcTsJitter(uint32_t base)
{
pkt_base_ = pkt_last_ = 0;
correct_last_ = correct_base_ = 0;
base_ = base;
init_ = false;
int32_t threshold = 3 * 90 * 1000; // 3s in TBN=90K.
jitter_ = new SrsRtcJitter<uint32_t, int32_t>(base, threshold, srs_rtp_ts_distance);
}
SrsRtcJitter::~SrsRtcJitter()
SrsRtcTsJitter::~SrsRtcTsJitter()
{
srs_freep(jitter_);
}
uint32_t SrsRtcJitter::correct(uint32_t ts)
uint32_t SrsRtcTsJitter::correct(uint32_t value)
{
if (!init_) {
init_ = true;
correct_base_ = base_;
srs_trace("RTC: Jitter init base=%u, ts=%u", base_, ts);
}
if (!pkt_base_) pkt_base_ = ts;
return jitter_->correct(value);
}
if (pkt_last_) {
int32_t distance = srs_rtp_ts_distance(ts, pkt_last_);
static int32_t max_deviation = 90 * 3 * 1000;
if (distance > max_deviation || distance < -1 * max_deviation) {
srs_trace("RTC: Jitter rebase ts=%u, last=%u, distance=%d, pkt-base=%u/%u, correct-base=%u/%u", ts, pkt_last_, distance, pkt_base_, ts, correct_base_, correct_last_);
pkt_base_ = ts;
correct_base_ = correct_last_;
}
}
pkt_last_ = ts;
SrsRtcSeqJitter::SrsRtcSeqJitter(uint16_t base)
{
jitter_ = new SrsRtcJitter<uint16_t, int16_t>(base, 128, srs_rtp_seq_distance);
}
correct_last_ = correct_base_ + ts - pkt_base_;
return correct_last_;
SrsRtcSeqJitter::~SrsRtcSeqJitter()
{
srs_freep(jitter_);
}
uint16_t SrsRtcSeqJitter::correct(uint16_t value)
{
return jitter_->correct(value);
}
SrsRtcSendTrack::SrsRtcSendTrack(SrsRtcConnection* session, SrsRtcTrackDescription* track_desc, bool is_audio)
@ -2588,10 +2583,9 @@ SrsRtcSendTrack::SrsRtcSendTrack(SrsRtcConnection* session, SrsRtcTrackDescripti
track_desc_ = track_desc->copy();
nack_no_copy_ = false;
seqno_ = 0;
init_ = false;
// Make a different start of sequence number, for debugging.
jitter_ = new SrsRtcJitter(track_desc_->type_ == "audio" ? 10000 : 20000);
jitter_ts_ = new SrsRtcTsJitter(track_desc_->type_ == "audio" ? 10000 : 20000);
jitter_seq_ = new SrsRtcSeqJitter(track_desc_->type_ == "audio" ? 100 : 200);
if (is_audio) {
rtp_queue_ = new SrsRtpRingBuffer(100);
@ -2607,7 +2601,8 @@ SrsRtcSendTrack::~SrsRtcSendTrack()
srs_freep(rtp_queue_);
srs_freep(track_desc_);
srs_freep(nack_epp);
srs_freep(jitter_);
srs_freep(jitter_ts_);
srs_freep(jitter_seq_);
}
bool SrsRtcSendTrack::has_ssrc(uint32_t ssrc)
@ -2661,18 +2656,14 @@ std::string SrsRtcSendTrack::get_track_id()
void SrsRtcSendTrack::rebuild_packet(SrsRtpPacket* pkt)
{
// Rebuild the sequence number.
if (!init_) {
init_ = true;
// Make a different start of sequence number, for debugging.
seqno_ = track_desc_->type_ == "audio" ? 1000 : 2000;
srs_trace("RTC: Seqno rebuild %s track=%s, ssrc=%d, seqno=%d to %d", track_desc_->type_.c_str(), track_desc_->id_.c_str(),
pkt->header.get_ssrc(), pkt->header.get_sequence(), seqno_);
}
pkt->header.set_sequence(seqno_++);
int16_t seq = pkt->header.get_sequence();
pkt->header.set_sequence(jitter_seq_->correct(seq));
// Rebuild the timestamp.
uint32_t ts = pkt->header.get_timestamp();
pkt->header.set_timestamp(jitter_->correct(ts));
pkt->header.set_timestamp(jitter_ts_->correct(ts));
srs_warn("RTC: Correct %s seq=%u/%u, ts=%u/%u", track_desc_->type_.c_str(), seq, pkt->header.get_sequence(), ts, pkt->header.get_timestamp());
}
srs_error_t SrsRtcSendTrack::on_nack(SrsRtpPacket** ppkt)