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webrtcsink: tune homegrown CC algorithm

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Make control decisions based on packet loss closer in intent to
the algorithm described in gcc section 6., and raise the threshold
for decreasing the bitrate based on delay_factor
This commit is contained in:
Mathieu Duponchelle 2021-12-01 01:53:10 +01:00
parent b12d91775d
commit 7bd7c4e960
1 changed files with 29 additions and 9 deletions
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38
plugins/src/webrtcsink/imp.rs
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@ -548,13 +548,14 @@ impl CongestionController {
twcc_stats twcc_stats
); );
if delay_factor > 0.01 { if delay_factor > 0.1 {
CongestionControlOp::Decrease(if delay_factor < 0.64 { CongestionControlOp::Decrease(if delay_factor < 0.64 {
gst_trace!( gst_trace!(
CAT, CAT,
obj: element, obj: element,
"consumer {}: low delay factor", "consumer {}: low delay factor {}",
self.peer_id self.peer_id,
delay_factor,
); );
0.96 0.96
} else { } else {
@ -566,16 +567,35 @@ impl CongestionController {
); );
delay_factor.sqrt().sqrt().clamp(0.8, 0.96) delay_factor.sqrt().sqrt().clamp(0.8, 0.96)
}) })
} else if delta_of_delta > 1000000 || loss_percentage > 2.0 { } else if delta_of_delta > 1000000 {
CongestionControlOp::Decrease(if loss_percentage > 0. && loss_percentage < 2.0 { CongestionControlOp::Decrease(if loss_percentage < 10. {
gst_trace!(CAT, obj: element, "consumer {}: low loss", self.peer_id); gst_trace!(
CAT,
obj: element,
"consumer {}: moderate loss high delta",
self.peer_id
);
0.97 0.97
} else { } else {
gst_log!(CAT, obj: element, "consumer: {}: high loss", self.peer_id); gst_log!(
CAT,
obj: element,
"consumer: {}: high loss high delta",
self.peer_id
);
((100. - loss_percentage) / 100.).clamp(0.7, 0.98) ((100. - loss_percentage) / 100.).clamp(0.7, 0.98)
}) })
} else if loss_percentage > 0.01 { } else if loss_percentage > 10. {
gst_trace!(CAT, obj: element, "consumer {}: tiny loss", self.peer_id); CongestionControlOp::Decrease(
((100. - (0.5 * loss_percentage)) / 100.).clamp(0.7, 0.98),
)
} else if loss_percentage > 2. {
gst_trace!(
CAT,
obj: element,
"consumer {}: moderate loss",
self.peer_id
);
CongestionControlOp::Hold CongestionControlOp::Hold
} else { } else {
gst_trace!( gst_trace!(