/
slope_estimator.go
53 lines (45 loc) · 1.12 KB
/
slope_estimator.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
package gcc
import (
"time"
)
type estimator interface {
updateEstimate(measurement time.Duration) time.Duration
}
type estimatorFunc func(time.Duration) time.Duration
func (f estimatorFunc) updateEstimate(d time.Duration) time.Duration {
return f(d)
}
type slopeEstimator struct {
estimator
init bool
group arrivalGroup
delayStatsWriter func(DelayStats)
}
func newSlopeEstimator(e estimator, dsw func(DelayStats)) *slopeEstimator {
return &slopeEstimator{
estimator: e,
delayStatsWriter: dsw,
}
}
func (e *slopeEstimator) onArrivalGroup(ag arrivalGroup) {
if !e.init {
e.group = ag
e.init = true
return
}
measurement := interGroupDelayVariation(e.group, ag)
delta := ag.arrival.Sub(e.group.arrival)
e.group = ag
e.delayStatsWriter(DelayStats{
Measurement: measurement,
Estimate: e.updateEstimate(measurement),
Threshold: 0,
LastReceiveDelta: delta,
Usage: 0,
State: 0,
TargetBitrate: 0,
})
}
func interGroupDelayVariation(a, b arrivalGroup) time.Duration {
return b.arrival.Sub(a.arrival) - b.departure.Sub(a.departure)
}