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// Package samplebuilder provides functionality to reconstruct media frames from RTP packets.
package samplebuilder
type sampleSequenceLocation struct {
// head is the first packet in a sequence
head uint16
// tail is always set to one after the final sequence number,
// so if head == tail then the sequence is empty
tail uint16
}
func (l sampleSequenceLocation) empty() bool {
return l.head == l.tail
}
func (l sampleSequenceLocation) hasData() bool {
return l.head != l.tail
}
func (l sampleSequenceLocation) count() uint16 {
return seqnumDistance(l.head, l.tail)
}
const (
slCompareVoid = iota
slCompareBefore
slCompareInside
slCompareAfter
)
func (l sampleSequenceLocation) compare(pos uint16) int {
if l.head == l.tail {
return slCompareVoid
}
if l.head < l.tail {
if l.head <= pos && pos < l.tail {
return slCompareInside
}
} else {
if l.head <= pos || pos < l.tail {
return slCompareInside
}
}
if l.head-pos <= pos-l.tail {
return slCompareBefore
}
return slCompareAfter
}
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