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queue.go
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queue.go
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// Packege pubsub implements publisher-subscribers model used in multi-channel streaming.
package pubsub
import (
"github.com/nareix/joy4/av"
"github.com/nareix/joy4/av/pktque"
"io"
"sync"
"time"
)
// time
// ----------------->
//
// V-A-V-V-A-V-V-A-V-V
// | |
// 0 5 10
// head tail
// oldest latest
//
// One publisher and multiple subscribers thread-safe packet buffer queue.
type Queue struct {
buf *pktque.Buf
head, tail int
lock *sync.RWMutex
cond *sync.Cond
curgopcount, maxgopcount int
streams []av.CodecData
videoidx int
closed bool
}
func NewQueue() *Queue {
q := &Queue{}
q.buf = pktque.NewBuf()
q.maxgopcount = 2
q.lock = &sync.RWMutex{}
q.cond = sync.NewCond(q.lock.RLocker())
q.videoidx = -1
return q
}
func (self *Queue) SetMaxGopCount(n int) {
self.lock.Lock()
self.maxgopcount = n
self.lock.Unlock()
return
}
func (self *Queue) WriteHeader(streams []av.CodecData) error {
self.lock.Lock()
self.streams = streams
for i, stream := range streams {
if stream.Type().IsVideo() {
self.videoidx = i
}
}
self.cond.Broadcast()
self.lock.Unlock()
return nil
}
func (self *Queue) WriteTrailer() error {
return nil
}
// After Close() called, all QueueCursor's ReadPacket will return io.EOF.
func (self *Queue) Close() (err error) {
self.lock.Lock()
self.closed = true
self.cond.Broadcast()
self.lock.Unlock()
return
}
// Put packet into buffer, old packets will be discared.
func (self *Queue) WritePacket(pkt av.Packet) (err error) {
self.lock.Lock()
self.buf.Push(pkt)
if pkt.Idx == int8(self.videoidx) && pkt.IsKeyFrame {
self.curgopcount++
}
for self.curgopcount >= self.maxgopcount && self.buf.Count > 1 {
pkt := self.buf.Pop()
if pkt.Idx == int8(self.videoidx) && pkt.IsKeyFrame {
self.curgopcount--
}
if self.curgopcount < self.maxgopcount {
break
}
}
//println("shrink", self.curgopcount, self.maxgopcount, self.buf.Head, self.buf.Tail, "count", self.buf.Count, "size", self.buf.Size)
self.cond.Broadcast()
self.lock.Unlock()
return
}
type QueueCursor struct {
que *Queue
pos pktque.BufPos
gotpos bool
init func(buf *pktque.Buf, videoidx int) pktque.BufPos
}
func (self *Queue) newCursor() *QueueCursor {
return &QueueCursor{
que: self,
}
}
// Create cursor position at latest packet.
func (self *Queue) Latest() *QueueCursor {
cursor := self.newCursor()
cursor.init = func(buf *pktque.Buf, videoidx int) pktque.BufPos {
return buf.Tail
}
return cursor
}
// Create cursor position at oldest buffered packet.
func (self *Queue) Oldest() *QueueCursor {
cursor := self.newCursor()
cursor.init = func(buf *pktque.Buf, videoidx int) pktque.BufPos {
return buf.Head
}
return cursor
}
// Create cursor position at specific time in buffered packets.
func (self *Queue) DelayedTime(dur time.Duration) *QueueCursor {
cursor := self.newCursor()
cursor.init = func(buf *pktque.Buf, videoidx int) pktque.BufPos {
i := buf.Tail - 1
if buf.IsValidPos(i) {
end := buf.Get(i)
for buf.IsValidPos(i) {
if end.Time-buf.Get(i).Time > dur {
break
}
i--
}
}
return i
}
return cursor
}
// Create cursor position at specific delayed GOP count in buffered packets.
func (self *Queue) DelayedGopCount(n int) *QueueCursor {
cursor := self.newCursor()
cursor.init = func(buf *pktque.Buf, videoidx int) pktque.BufPos {
i := buf.Tail - 1
if videoidx != -1 {
for gop := 0; buf.IsValidPos(i) && gop < n; i-- {
pkt := buf.Get(i)
if pkt.Idx == int8(self.videoidx) && pkt.IsKeyFrame {
gop++
}
}
}
return i
}
return cursor
}
func (self *QueueCursor) Streams() (streams []av.CodecData, err error) {
self.que.cond.L.Lock()
for self.que.streams == nil && !self.que.closed {
self.que.cond.Wait()
}
if self.que.streams != nil {
streams = self.que.streams
} else {
err = io.EOF
}
self.que.cond.L.Unlock()
return
}
// ReadPacket will not consume packets in Queue, it's just a cursor.
func (self *QueueCursor) ReadPacket() (pkt av.Packet, err error) {
self.que.cond.L.Lock()
buf := self.que.buf
if !self.gotpos {
self.pos = self.init(buf, self.que.videoidx)
self.gotpos = true
}
for {
if self.pos.LT(buf.Head) {
self.pos = buf.Head
} else if self.pos.GT(buf.Tail) {
self.pos = buf.Tail
}
if buf.IsValidPos(self.pos) {
pkt = buf.Get(self.pos)
self.pos++
break
}
if self.que.closed {
err = io.EOF
break
}
self.que.cond.Wait()
}
self.que.cond.L.Unlock()
return
}