diff --git a/client.go b/client.go
index 1a4576d..435a085 100644
--- a/client.go
+++ b/client.go
@@ -15,7 +15,9 @@ import (
 	"crypto/md5"
 	"github.com/nareix/av"
 	"github.com/nareix/codec/h264parser"
+	"github.com/nareix/codec/aacparser"
 	"github.com/nareix/rtsp/sdp"
+	"github.com/nareix/av/pktqueue"
 )
 
 type Client struct {
@@ -29,6 +31,7 @@ type Client struct {
 	session string
 	authorization string
 	body io.Reader
+	pktque *pktqueue.Queue
 }
 
 type Request struct {
@@ -72,6 +75,13 @@ func Connect(uri string) (self *Client, err error) {
 	return
 }
 
+func (self *Client) Streams() (streams []av.CodecData) {
+	for _, stream := range self.streams {
+		streams = append(streams, stream.CodecData)
+	}
+	return
+}
+
 func (self *Client) writeLine(line string) (err error) {
 	if self.DebugConn {
 		fmt.Print("> ", line)
@@ -124,6 +134,7 @@ func (self *Client) ReadResponse() (res Response, err error) {
 	if _, err = io.ReadFull(self.rconn, h[:]); err != nil {
 		return
 	}
+
 	if h[0] == 36 {
 		// $
 		res.BlockLength = int(h[2])<<8+int(h[3])
@@ -132,11 +143,35 @@ func (self *Client) ReadResponse() (res Response, err error) {
 			fmt.Println("block: len", res.BlockLength, "no", res.BlockNo)
 		}
 		return
-	} else if h[0] == 82 {
+	} else if h[0] == 82 && h[1] == 84 && h[2] == 83 && h[3] == 80 {
 		// RTSP 200 OK
 		self.rconn = io.MultiReader(bytes.NewReader(h[:]), self.rconn)
 	} else {
-		err = fmt.Errorf("invalid response bytes=%v", h)
+		for {
+			for {
+				var b [1]byte
+				if _, err = self.rconn.Read(b[:]); err != nil {
+					return
+				}
+				if b[0] == 36 {
+					break
+				}
+			}
+			if self.DebugConn {
+				fmt.Println("block: relocate")
+			}
+			if _, err = io.ReadFull(self.rconn, h[1:4]); err != nil {
+				return
+			}
+			res.BlockLength = int(h[2])<<8+int(h[3])
+			res.BlockNo = int(h[1])
+			if res.BlockNo/2 < len(self.streams) {
+				break
+			}
+		}
+		if self.DebugConn {
+			fmt.Println("block: len", res.BlockLength, "no", res.BlockNo)
+		}
 		return
 	}
 
@@ -236,10 +271,14 @@ func (self *Client) ReadResponse() (res Response, err error) {
 
 func (self *Client) Setup(streams []int) (err error) {
 	for _, si := range streams {
-		req := Request{
-			Method: "SETUP",
-			Uri: self.requestUri+"/"+self.streams[si].Sdp.Control,
+		uri := ""
+		control := self.streams[si].Sdp.Control
+		if strings.HasPrefix(control, "rtsp://") {
+			uri = control
+		} else {
+			uri = self.requestUri+"/"+control
 		}
+		req := Request{Method: "SETUP", Uri: uri}
 		req.Header = append(req.Header, fmt.Sprintf("Transport: RTP/AVP/TCP;unicast;interleaved=%d-%d", si*2, si*2+1))
 		if self.session != "" {
 			req.Header = append(req.Header, "Session: "+self.session)
@@ -259,7 +298,7 @@ func md5hash(s string) string {
 	return hex.EncodeToString(h[:])
 }
 
-func (self *Client) Describe() (streams []av.Stream, err error) {
+func (self *Client) Describe() (streams []av.CodecData, err error) {
 	var res Response
 
 	for i := 0; i < 2; i++ {
@@ -294,39 +333,48 @@ func (self *Client) Describe() (streams []av.Stream, err error) {
 	self.streams = []*Stream{}
 	for _, info := range sdp.Decode(body) {
 		stream := &Stream{Sdp: info}
-		stream.SetType(info.Type)
 
-		switch info.Type {
-		case av.H264:
-			var sps, pps []byte
-			for _, nalu := range info.SpropParameterSets {
-				if len(nalu) > 0 {
-					switch nalu[0]&0x1f {
-					case 7:
-						sps = nalu
-					case 8:
-						pps = nalu
+		if info.PayloadType >= 96 && info.PayloadType <= 127 {
+			switch info.Type {
+			case av.H264:
+				var sps, pps []byte
+				for _, nalu := range info.SpropParameterSets {
+					if len(nalu) > 0 {
+						switch nalu[0]&0x1f {
+						case 7:
+							sps = nalu
+						case 8:
+							pps = nalu
+						}
 					}
 				}
-			}
-			if len(sps) > 0 && len(pps) > 0 {
-				codecData, _ := h264parser.CreateCodecDataBySPSAndPPS(sps, pps)
-				if err = stream.SetCodecData(codecData); err != nil {
-					err = fmt.Errorf("h264 sps/pps invalid: %s", err)
+				if len(sps) > 0 && len(pps) > 0 {
+					if stream.CodecData, err = h264parser.NewCodecDataFromSPSAndPPS(sps, pps); err != nil {
+						err = fmt.Errorf("h264 sps/pps invalid: %s", err)
+						return
+					}
+				} else {
+					err = fmt.Errorf("h264 sdp sprop-parameter-sets invalid: missing sps or pps")
 					return
 				}
-			} else {
-				err = fmt.Errorf("h264 sdp sprop-parameter-sets invalid: missing sps or pps")
-				return
-			}
 
-		case av.AAC:
-			if len(info.Config) == 0 {
-				err = fmt.Errorf("aac sdp config missing")
-				return
+			case av.AAC:
+				if len(info.Config) == 0 {
+					err = fmt.Errorf("aac sdp config missing")
+					return
+				}
+				if stream.CodecData, err = aacparser.NewCodecDataFromMPEG4AudioConfigBytes(info.Config); err != nil {
+					err = fmt.Errorf("aac sdp config invalid: %s", err)
+					return
+				}
 			}
-			if err = stream.SetCodecData(info.Config); err != nil {
-				err = fmt.Errorf("aac sdp config invalid: %s", err)
+		} else {
+			switch info.PayloadType {
+			case 0:
+				stream.CodecData = av.NewPCMMulawCodecData()
+
+			default:
+				err = fmt.Errorf("PayloadType=%d unsupported", info.PayloadType)
 				return
 			}
 		}
@@ -337,6 +385,11 @@ func (self *Client) Describe() (streams []av.Stream, err error) {
 	for _, stream := range self.streams {
 		streams = append(streams, stream)
 	}
+	self.pktque = &pktqueue.Queue{
+		Poll: self.poll,
+	}
+	self.pktque.Alloc(streams)
+
 	return
 }
 
@@ -372,6 +425,7 @@ func (self *Stream) handleH264Payload(naluType byte, timestamp uint32, packet []
 		}
 		self.gotpkt = true
 		self.pkt.Data = packet
+		self.timestamp = timestamp
 	}
 
 	return
@@ -379,8 +433,6 @@ func (self *Stream) handleH264Payload(naluType byte, timestamp uint32, packet []
 
 func (self *Stream) handlePacket(timestamp uint32, packet []byte) (err error) {
 	switch self.Type() {
-	case av.AAC:
-
 	case av.H264:
 		/*
 		+---------------+
@@ -480,6 +532,11 @@ func (self *Stream) handlePacket(timestamp uint32, packet []byte) (err error) {
 			err = fmt.Errorf("unsupported H264 naluType=%d", naluType)
 			return
 		}
+
+	default:
+		self.gotpkt = true
+		self.pkt.Data = packet
+		self.timestamp = timestamp
 	}
 	return
 }
@@ -490,6 +547,9 @@ func (self *Client) parseBlock(blockNo int, packet []byte) (streamIndex int, err
 		return
 	}
 
+	streamIndex = blockNo/2
+	stream := self.streams[streamIndex]
+
 	/*
 	0                   1                   2                   3
 	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
@@ -562,9 +622,6 @@ func (self *Client) parseBlock(blockNo int, packet []byte) (streamIndex int, err
 	*/
 	//payloadType := packet[1]&0x7f
 
-	streamIndex = blockNo/2
-	stream := self.streams[streamIndex]
-
 	if self.DebugConn {
 		//fmt.Println("packet:", stream.Type(), "offset", payloadOffset, "pt", payloadType)
 		if len(packet)>24 {
@@ -591,19 +648,22 @@ func (self *Client) Play() (err error) {
 	return
 }
 
-func (self *Client) ReadPacket() (streamIndex int, pkt av.Packet, err error) {
+func (self *Client) poll() (err error) {
 	for {
 		var res Response
 		if res, err = self.ReadResponse(); err != nil {
 			return
 		}
 		if res.BlockLength > 0 {
-			if streamIndex, err = self.parseBlock(res.BlockNo, res.Block); err != nil {
+			var i int
+			if i, err = self.parseBlock(res.BlockNo, res.Block); err != nil {
 				return
 			}
-			stream := self.streams[streamIndex]
+			stream := self.streams[i]
 			if stream.gotpkt {
-				pkt = stream.pkt
+				time := float64(stream.timestamp)/float64(stream.Sdp.TimeScale)
+				self.pktque.WriteTimePacket(i, time, stream.pkt)
+				stream.pkt = av.Packet{}
 				stream.gotpkt = false
 				return
 			}
@@ -612,3 +672,37 @@ func (self *Client) ReadPacket() (streamIndex int, pkt av.Packet, err error) {
 	return
 }
 
+func (self *Client) ReadPacket() (i int, pkt av.Packet, err error) {
+	return self.pktque.ReadPacket()
+}
+
+func Open(uri string) (cli *Client, err error) {
+	_cli, err := Connect(uri)
+	if err != nil {
+		return
+	}
+
+	streams, err := _cli.Describe()
+	if err != nil {
+		return
+	}
+
+	setup := []int{}
+	for i := range streams {
+		setup = append(setup, i)
+	}
+
+	err = _cli.Setup(setup)
+	if err != nil {
+		return
+	}
+
+	err = _cli.Play()
+	if err != nil {
+		return
+	}
+
+	cli = _cli
+	return
+}
+