package jitter import ( "sync/atomic" "github.com/jech/galene/rtptime" ) type Estimator struct { hz uint32 timestamp uint32 time uint32 jitter uint32 // atomic } func New(hz uint32) *Estimator { return &Estimator{hz: hz} } func (e *Estimator) accumulate(timestamp, now uint32) { if e.time == 0 { e.timestamp = timestamp e.time = now } d := uint32((e.time - now) - (e.timestamp - timestamp)) if d&0x80000000 != 0 { d = uint32(-int32(d)) } oldjitter := atomic.LoadUint32(&e.jitter) jitter := (oldjitter*15 + d) / 16 atomic.StoreUint32(&e.jitter, jitter) e.timestamp = timestamp e.time = now } func (e *Estimator) Accumulate(timestamp uint32) { e.accumulate(timestamp, uint32(rtptime.Now(e.hz))) } func (e *Estimator) Jitter() uint32 { return atomic.LoadUint32(&e.jitter) } func (e *Estimator) HZ() uint32 { return e.hz }