修复rtmp内存池缓存失败问题

stream/queue.go

@@ -0,0 +1,48 @@
+package stream
+
+import "github.com/yangjiechina/avformat/utils"
+
+type Queue struct {
+	*ringBuffer
+}
+
+func NewQueue(capacity int) *Queue {
+	utils.Assert(capacity > 0)
+
+	return &Queue{ringBuffer: &ringBuffer{
+		data: make([]interface{}, capacity),
+		head: 0,
+		tail: 0,
+		size: 0,
+	}}
+}
+
+func (q *Queue) Push(value interface{}) {
+	if q.ringBuffer.IsFull() {
+		newArray := make([]interface{}, q.ringBuffer.Size()*2)
+		head, tail := q.ringBuffer.All()
+		copy(newArray, head)
+		if tail != nil {
+			copy(newArray[len(head):], tail)
+		}
+
+		q.data = newArray
+		q.head = 0
+		q.tail = q.size
+	}
+
+	q.data[q.tail] = value
+	q.tail = (q.tail + 1) % cap(q.data)
+
+	q.size++
+}
+
+func (q *Queue) PopBack() interface{} {
+	utils.Assert(q.size > 0)
+
+	value := q.ringBuffer.Tail()
+	q.size--
+	q.tail = utils.MaxInt(0, q.tail-1)
+
+	return value
+}