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74 lines
1.3 KiB
Go
74 lines
1.3 KiB
Go
package pktque
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import (
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"github.com/Danile71/joy4/av"
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)
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type Buf struct {
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Head, Tail BufPos
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pkts []av.Packet
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Size int
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Count int
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}
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func NewBuf() *Buf {
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return &Buf{
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pkts: make([]av.Packet, 64),
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}
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}
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func (self *Buf) Pop() av.Packet {
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if self.Count == 0 {
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panic("pktque.Buf: Pop() when count == 0")
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}
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i := int(self.Head) & (len(self.pkts) - 1)
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pkt := self.pkts[i]
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self.pkts[i] = av.Packet{}
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self.Size -= len(pkt.Data)
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self.Head++
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self.Count--
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return pkt
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}
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func (self *Buf) grow() {
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newpkts := make([]av.Packet, len(self.pkts)*2)
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for i := self.Head; i.LT(self.Tail); i++ {
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newpkts[int(i)&(len(newpkts)-1)] = self.pkts[int(i)&(len(self.pkts)-1)]
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}
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self.pkts = newpkts
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}
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func (self *Buf) Push(pkt av.Packet) {
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if self.Count == len(self.pkts) {
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self.grow()
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}
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self.pkts[int(self.Tail)&(len(self.pkts)-1)] = pkt
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self.Tail++
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self.Count++
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self.Size += len(pkt.Data)
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}
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func (self *Buf) Get(pos BufPos) av.Packet {
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return self.pkts[int(pos)&(len(self.pkts)-1)]
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}
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func (self *Buf) IsValidPos(pos BufPos) bool {
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return pos.GE(self.Head) && pos.LT(self.Tail)
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}
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type BufPos int
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func (self BufPos) LT(pos BufPos) bool {
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return self-pos < 0
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}
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func (self BufPos) GE(pos BufPos) bool {
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return self-pos >= 0
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}
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func (self BufPos) GT(pos BufPos) bool {
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return self-pos > 0
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}
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