diff --git a/pkg/logic/gop_cache.go b/pkg/logic/gop_cache.go
index db3b922..3bbdbfc 100644
--- a/pkg/logic/gop_cache.go
+++ b/pkg/logic/gop_cache.go
@@ -58,14 +58,20 @@ type GOPCache struct {
 	Metadata       []byte
 	VideoSeqHeader []byte
 	AACSeqHeader   []byte
-	gopCircularQue *gopCircularQueue
+	gopRing        []GOP
+	gopRingFirst   int
+	gopRingLast    int
+	gopSize        int
 }
 
 func NewGopCache(t string, uniqueKey string, gopNum int) *GOPCache {
 	return &GOPCache{
 		t:         t,
 		uniqueKey: uniqueKey,
-		gopCircularQue: NewGopCircularQueue(gopNum),
+		gopSize: gopNum + 1,
+		gopRing: make([]GOP, gopNum + 1, gopNum + 1),
+		gopRingFirst: 0,
+		gopRingLast: 0,
 	}
 }
 
@@ -90,44 +96,47 @@ func (gc *GOPCache) Feed(msg rtmp.AVMsg, lg LazyGet) {
 			return
 		}
 	}
-	if gc.gopCircularQue.Cap() != 0 {
+
+	if gc.gopSize > 1 {
 		if msg.IsVideoKeyNalu() {
-			var gop *GOP
-			if gc.gopCircularQue.Full() {
-				//如果已经满了，获取队首即将被淘汰的GOP
-				gop = gc.gopCircularQue.Front()
-				gop.Clear()
-			} else {
-				gop = &GOP{}
+			gc.gopRing[gc.gopRingLast].Clear()
+			gc.gopRing[gc.gopRingLast].Feed(msg, lg())
+			gc.gopRingLast = (gc.gopRingLast + 1) % gc.gopSize
+			if gc.gopRingLast == gc.gopRingFirst {
+				gc.gopRingFirst = (gc.gopRingFirst + 1) % gc.gopSize
 			}
-			gop.Feed(msg, lg())
-			gc.gopCircularQue.Enqueue(gop)
 		} else {
-			gop := gc.gopCircularQue.Back()
-			if gop != nil {
-				gop.Feed(msg, lg())
+			if gc.gopRingLast != gc.gopRingFirst {
+				gc.gopRing[(gc.gopRingLast - 1 + gc.gopSize) % gc.gopSize].Feed(msg, lg())
 			}
 		}
 	}
 }
 
 func (gc *GOPCache) GetGopLen() int{
-	return gc.gopCircularQue.Len()
+	return (gc.gopRingLast + gc.gopSize - gc.gopRingFirst) % gc.gopSize
 }
 
-func (gc *GOPCache) GetGopAt(pos int) *GOP {
-	return gc.gopCircularQue.At(pos)
+func (gc *GOPCache) GetGopDataAt(pos int) [][]byte {
+	if pos >= gc.GetGopLen() || pos < 0 {
+		return nil
+	}
+	return gc.gopRing[(pos + gc.gopRingFirst) % gc.gopSize].data
 }
 
 func (gc *GOPCache) LastGOP() *GOP {
-	return gc.gopCircularQue.Back()
+	if gc.GetGopLen() == 0 {
+		return nil
+	}
+	return &gc.gopRing[(gc.gopRingLast - 1 + gc.gopSize) % gc.gopSize]
 }
 
 func (gc *GOPCache) Clear() {
 	gc.Metadata = nil
 	gc.VideoSeqHeader = nil
 	gc.AACSeqHeader = nil
-	gc.gopCircularQue.Clear()
+	gc.gopRingLast = 0
+	gc.gopRingFirst = 0
 }
 
 type GOP struct {
@@ -141,102 +150,3 @@ func (g *GOP) Feed(msg rtmp.AVMsg, b []byte) {
 func (g *GOP) Clear() {
 	g.data = g.data[:0]
 }
-
-type gopCircularQueue struct {
-	buf []*GOP
-	size int
-	first int
-	last int
-}
-
-func NewGopCircularQueue(cap int) *gopCircularQueue {
-	if cap < 0 {
-		panic("negative cap argument in NewGopCircularQueue")
-	}
-	
-	size := cap + 1
-	return &gopCircularQueue{
-		buf: make([]*GOP, size, size),
-		size: size,
-		first: 0,
-		last: 0,
-	}
-}
-
-//Enqueue 入队
-func (gcq *gopCircularQueue) Enqueue(gop *GOP) {
-	if gcq.Full() {
-		//队列满了，抛弃队首元素
-		gcq.firstInc()
-	}
-	gcq.buf[gcq.last] = gop
-	gcq.lastInc()
-}
-
-//Dequeue 队首元素出队
-func (gcq *gopCircularQueue) Dequeue() *GOP{
-	if gcq.Empty() {
-		return nil
-	}
-	
-	//把first return
-	gop := gcq.buf[gcq.first]
-	gcq.firstInc()
-	
-	return gop
-}
-
-func (gcq *gopCircularQueue) Full() bool {
-	return (gcq.last + 1) % gcq.size == gcq.first
-}
-
-func (gcq *gopCircularQueue) Empty() bool{
-	return gcq.first == gcq.last
-}
-
-//Len 获取元素的个数
-func (gcq *gopCircularQueue) Len() int{
-	return (gcq.last + gcq.size -  gcq.first) % gcq.size
-}
-
-//Cap 获取队列的容量
-func (gcq *gopCircularQueue) Cap() int {
-	return gcq.size - 1
-}
-
-//Front 获取队首元素，不出队
-func (gcq *gopCircularQueue) Front() *GOP {
-	if gcq.Empty() {
-		return nil
-	}
-	return gcq.buf[gcq.first]
-}
-
-//Back 获取队尾元素，不出队
-func (gcq *gopCircularQueue) Back() *GOP {
-	if gcq.Empty() {
-		return nil
-	}
-	return gcq.buf[(gcq.last + gcq.size - 1) % gcq.size]
-}
-
-//At 获取第pos个元素
-func (gcq *gopCircularQueue) At(pos int) *GOP {
-	if pos >= gcq.Len() || pos < 0 {
-		return nil
-	}
-	return gcq.buf[(pos + gcq.first) % gcq.size]
-}
-
-func (gcq *gopCircularQueue) Clear() {
-	gcq.first = 0
-	gcq.last = 0
-}
-
-func (gcq *gopCircularQueue) lastInc() {
-	gcq.last = (gcq.last + 1) % gcq.size
-}
-
-func (gcq *gopCircularQueue) firstInc() {
-	gcq.first = (gcq.first + 1) % gcq.size
-}
diff --git a/pkg/logic/gop_cache_test.go b/pkg/logic/gop_cache_test.go
index da9a1aa..cd97a8a 100644
--- a/pkg/logic/gop_cache_test.go
+++ b/pkg/logic/gop_cache_test.go
@@ -1,371 +1,113 @@
 package logic
 
 import (
-	`github.com/q191201771/naza/pkg/assert`
-	`testing`
+	"github.com/q191201771/lal/pkg/rtmp"
+	"github.com/q191201771/naza/pkg/assert"
+	"testing"
 )
 
-func TestGopCircularQueueCap0(t *testing.T) {
-	var gcqCap int = 0
-	
-	gcq := NewGopCircularQueue(gcqCap)
-	
-	//fl
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	assert.Equal(t, nil, gcq.Dequeue())
-	
-	
-	//fl
-	tGOP := &GOP{
-		data:nil,
-	}
-	gcq.Enqueue(tGOP)
-	//fg
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	
-	
-	//弹出一个后
-	assert.Equal(t, nil, gcq.Dequeue())
-	//fg
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, 0, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil,  gcq.At(2))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	assert.Equal(t, nil, gcq.Dequeue())
-	
-	//放入2个元素后
-	gcq.Enqueue(tGOP)
-	gcq.Enqueue(tGOP)
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	assert.Equal(t, nil, gcq.Dequeue())
-}
+func TestGOPCache_Feed(t *testing.T) {
 
-func TestGopCircularQueue(t *testing.T) {
-	var gcqCap int = 3
-	
-	//元素为个数为0
-	//fl,_, _, _
-	gcq := NewGopCircularQueue(gcqCap)
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	//gop :=
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	assert.Equal(t, nil, gcq.Dequeue())
-	
-	//fl,_, _, _
-	tGOP := &GOP{
-		data:[][]byte{[]byte("t")},
-	}
-	gcq.Enqueue(tGOP)
-	//放入一个元素后
-	//tf,l, _, _
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 1, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, tGOP,  gcq.At(0))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, tGOP, gcq.Front())
-	assert.Equal(t, tGOP, gcq.Back())
-	
-	//在弹出一个元素后
-	//tf,l, _,_
-	assert.Equal(t, tGOP, gcq.Dequeue())
-	//_,fl, _,_
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	assert.Equal(t, nil, gcq.Dequeue())
-	
-	//_,fl, _,_
-	GOP0 := &GOP{
-		data:[][]byte{[]byte("0")},
-	}
-	gcq.Enqueue(GOP0)
-	//_,f0,l_,_
-	GOP1 := &GOP{
-		data:[][]byte{[]byte("1")},
+	i1 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0},
+		Payload: []byte{23, 1},
 	}
-	gcq.Enqueue(GOP1)
-	//_,f0, 1, l
-	//验证遍历情况
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 2, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP0, gcq.At(0))
-	assert.Equal(t, GOP1, gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, GOP0, gcq.Front())
-	assert.Equal(t, GOP1, gcq.Back())
-	
-	GOP2 := &GOP{
-		data:[][]byte{[]byte("2")},
+	p1 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{6, 0, 1},
 	}
-	gcq.Enqueue(GOP2)
-	//l,f0, 1, 2
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 3, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP0, gcq.At(0))
-	assert.Equal(t, GOP1, gcq.At(1))
-	assert.Equal(t, GOP2, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, GOP0, gcq.Front())
-	assert.Equal(t, GOP2, gcq.Back())
-	
-	//
-	GOP3 := &GOP{
-		data:[][]byte{[]byte("3")},
+	i2 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{23, 1},
 	}
-	gcq.Enqueue(GOP3)
-	//3, l, f1, 2
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 3, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP1, gcq.At(0))
-	assert.Equal(t, GOP2, gcq.At(1))
-	assert.Equal(t, GOP3, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, GOP1, gcq.Front())
-	assert.Equal(t, GOP3, gcq.Back())
-	
-	
-	
-	//3, l, f1, 2
-	assert.Equal(t, GOP1, gcq.Dequeue())
-	//出队后
-	//3, l, _, f2
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 2, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP2, gcq.At(0))
-	assert.Equal(t, GOP3, gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP2, gcq.Front())
-	assert.Equal(t, GOP3, gcq.Back())
-	
-	
-	
-	//3, l, _, f2
-	GOP4 := &GOP{
-		data:[][]byte{[]byte("4")},
+	p2 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{6, 0, 2},
 	}
-	gcq.Enqueue(GOP4)
-	//入队后
-	//3, 4, l, f2
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 3, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP2, gcq.At(0))
-	assert.Equal(t, GOP3, gcq.At(1))
-	assert.Equal(t, GOP4, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP2, gcq.Front())
-	assert.Equal(t, GOP4, gcq.Back())
-	
-	//3, 4, l, 2f
-	assert.Equal(t, GOP2, gcq.Dequeue())
-	//3f, 4, l, _
-	
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 2, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP3,  gcq.At(0))
-	assert.Equal(t, GOP4, gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP3, gcq.Front())
-	assert.Equal(t, GOP4, gcq.Back())
-	
-	//3f, 4, l, _
-	GOP5 := &GOP{
-		data:[][]byte{[]byte("5")},
+	i3 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{23, 1},
 	}
-	gcq.Enqueue(GOP5)
-	//3f, 4, 5, l
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 3, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP3, gcq.At(0))
-	assert.Equal(t, GOP4,  gcq.At(1))
-	assert.Equal(t, GOP5, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP3, gcq.Front())
-	assert.Equal(t, GOP5, gcq.Back())
-	
-	
-	
-	//3f, 4, 5, l
-	assert.Equal(t, GOP3, gcq.Dequeue())
-	//_, 4f, 5, l
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 2, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP4, gcq.At(0))
-	assert.Equal(t, GOP5, gcq.At(1))
-	assert.Equal(t, nil,  gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP4, gcq.Front())
-	assert.Equal(t, GOP5, gcq.Back())
-	
-	//_, 4f, 5, l
-	assert.Equal(t, GOP4, gcq.Dequeue())
-	//_, _, 5f, l
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 1, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP5, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil,  gcq.At(4))
-	assert.Equal(t, GOP5, gcq.Front())
-	assert.Equal(t, GOP5, gcq.Back())
-	
-	//_, _, 5f, l
-	assert.Equal(t, GOP5, gcq.Dequeue())
-	//_, _, _, fl
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, nil,  gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	
-	
-	//_, _, _, fl
-	GOP6 := &GOP{
-		data:[][]byte{[]byte("6")},
+	p3 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{6, 0, 3},
 	}
-	gcq.Enqueue(GOP6)
-	//l, _, _, f6
-	GOP7 := &GOP{
-		data:[][]byte{[]byte("7")},
+	i4 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{23, 1},
 	}
-	gcq.Enqueue(GOP7)
-	//7, l, _, f6
-	GOP8 := &GOP{
-		data:[][]byte{[]byte("8")},
+	p4 := rtmp.AVMsg{
+		Header:  rtmp.Header{CSID: 0, MsgLen: 0, Timestamp: 1, MsgTypeID: 9, MsgStreamID: 10, TimestampAbs: 0,},
+		Payload: []byte{6, 0, 4},
 	}
-	gcq.Enqueue(GOP8)
-	//7, 8, l, f6
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 3, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP6, gcq.At(0))
-	assert.Equal(t, GOP7, gcq.At(1))
-	assert.Equal(t, GOP8, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP6, gcq.Front())
-	assert.Equal(t, GOP8, gcq.Back())
-	
-	
-	GOP9 := &GOP{
-		data:[][]byte{[]byte("9")},
-	}
-	gcq.Enqueue(GOP9)
-	//f7, 8, 9, l
-	assert.Equal(t, false, gcq.Empty())
-	assert.Equal(t, true, gcq.Full())
-	assert.Equal(t, 3, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, GOP7, gcq.At(0))
-	assert.Equal(t, GOP8, gcq.At(1))
-	assert.Equal(t, GOP9, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, GOP7, gcq.Front())
-	assert.Equal(t, GOP9,  gcq.Back())
-	
-	//f7, 8, 9, l
-	assert.Equal(t, GOP7, gcq.Dequeue())
-	//_, f8, 9, l
-	assert.Equal(t, GOP8, gcq.Dequeue())
-	//_, _, f9, l
-	assert.Equal(t, GOP9, gcq.Dequeue())
-	//_, _, _, fl
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil, gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, nil,  gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
-	
-	
-	//_, _, _, fl
-	assert.Equal(t, nil, gcq.Dequeue())
-	//_, _, _, fl
-	assert.Equal(t, true, gcq.Empty())
-	assert.Equal(t, false, gcq.Full())
-	assert.Equal(t, 0, gcq.Len())
-	assert.Equal(t, gcqCap, gcq.Cap())
-	assert.Equal(t, nil, gcq.At(0))
-	assert.Equal(t, nil,  gcq.At(1))
-	assert.Equal(t, nil, gcq.At(2))
-	assert.Equal(t, nil, gcq.At(3))
-	assert.Equal(t, nil, gcq.At(4))
-	assert.Equal(t, nil, gcq.Front())
-	assert.Equal(t, nil, gcq.Back())
+	i1f := func()[]byte {return []byte{1, 1}}
+	p1f := func()[]byte {return []byte{0, 1}}
+	i2f := func()[]byte {return []byte{1, 2}}
+	p2f := func()[]byte {return []byte{0, 2}}
+	i3f := func()[]byte {return []byte{1, 3}}
+	p3f := func()[]byte {return []byte{0, 3}}
+	i4f := func()[]byte {return []byte{1, 4}}
+	p4f := func()[]byte {return []byte{0, 4}}
+
+
+	nc := NewGopCache("rtmp", "test", 3)
+	assert.Equal(t, 0, nc.GetGopLen())
+	assert.Equal(t, nil, nc.GetGopDataAt(0))
+	assert.Equal(t, nil, nc.GetGopDataAt(1))
+	assert.Equal(t, nil, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+
+	nc.Feed(i1, i1f)
+	assert.Equal(t, 1, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 1}}, nc.GetGopDataAt(0))
+	assert.Equal(t, nil, nc.GetGopDataAt(1))
+	assert.Equal(t, nil, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	nc.Feed(p1, p1f)
+	assert.Equal(t, 1, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
+	assert.Equal(t, nil, nc.GetGopDataAt(1))
+	assert.Equal(t, nil, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+
+
+	nc.Feed(i2, i2f)
+	assert.Equal(t, 2, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}}, nc.GetGopDataAt(1))
+	assert.Equal(t, nil, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	nc.Feed(p2, p2f)
+	assert.Equal(t, 2, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(1))
+	assert.Equal(t, nil, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+
+	nc.Feed(i3, i3f)
+	assert.Equal(t, 3, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(1))
+	assert.Equal(t, [][]byte{{1, 3}}, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	nc.Feed(p3, p3f)
+	assert.Equal(t, 3, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(1))
+	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+
+
+	nc.Feed(i4, i4f)
+	assert.Equal(t, 3, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(0))
+	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGopDataAt(1))
+	assert.Equal(t, [][]byte{{1, 4}}, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	nc.Feed(p4, p4f)
+	assert.Equal(t, 3, nc.GetGopLen())
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(0))
+	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGopDataAt(1))
+	assert.Equal(t, [][]byte{{1, 4}, {0, 4}}, nc.GetGopDataAt(2))
+	assert.Equal(t, nil, nc.GetGopDataAt(3))
 }
diff --git a/pkg/logic/group.go b/pkg/logic/group.go
index 99252a9..8547cdc 100644
--- a/pkg/logic/group.go
+++ b/pkg/logic/group.go
@@ -194,7 +194,7 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 				_ = session.AsyncWrite(group.gopCache.AACSeqHeader)
 			}
 			for i := 0; i < group.gopCache.GetGopLen();i++ {
-				for _, item := range group.gopCache.GetGopAt(i).data {
+				for _, item := range group.gopCache.GetGopDataAt(i) {
 					_ = session.AsyncWrite(item)
 				}
 			}
@@ -219,7 +219,7 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 				session.WriteRawPacket(group.httpflvGopCache.AACSeqHeader)
 			}
 			for i := 0; i < group.httpflvGopCache.GetGopLen(); i++ {
-				for _, item := range group.httpflvGopCache.GetGopAt(i).data {
+				for _, item := range group.httpflvGopCache.GetGopDataAt(i) {
 					session.WriteRawPacket(item)
 				}
 			}