diff --git a/trunk/src/core/srs_core_client.cpp b/trunk/src/core/srs_core_client.cpp
index 4ebe76dfa..86b420bca 100755
--- a/trunk/src/core/srs_core_client.cpp
+++ b/trunk/src/core/srs_core_client.cpp
@@ -108,17 +108,49 @@ int SrsClient::do_cycle()
 	}
 	srs_verbose("on_bw_done success");
 	
+	int stream_id = SRS_DEFAULT_SID;
 	SrsClientType type;
-	std::string stream_name;
-	if ((ret = rtmp->identify_client(SRS_DEFAULT_SID, type, stream_name)) != ERROR_SUCCESS) {
+	if ((ret = rtmp->identify_client(stream_id, type, req->stream)) != ERROR_SUCCESS) {
 		srs_error("identify client failed. ret=%d", ret);
 		return ret;
 	}
-	srs_verbose("identify client success. type=%d", type);
+	srs_verbose("identify client success. type=%d, stream_name=%s", type, req->stream.c_str());
+		
+	// TODO: read from config.
+	int chunk_size = 4096;
+	if ((ret = rtmp->set_chunk_size(chunk_size)) != ERROR_SUCCESS) {
+		srs_error("set chunk size failed. ret=%d", ret);
+		return ret;
+	}
+	srs_verbose("set chunk size success");
+	
+	switch (type) {
+		case SrsClientPlay: {
+			srs_verbose("start to play stream %s.", req->stream.c_str());
+			
+			if ((ret = rtmp->start_play(stream_id)) != ERROR_SUCCESS) {
+				srs_error("start to play stream failed. ret=%d", ret);
+				return ret;
+			}
+			srs_info("start to play stream %s success", req->stream.c_str());
+			return streaming_play();
+		}
+		default: {
+			ret = ERROR_SYSTEM_CLIENT_INVALID;
+			srs_info("invalid client type=%d. ret=%d", type, ret);
+			return ret;
+		}
+	}
 	
 	return ret;
 }
 
+int SrsClient::streaming_play()
+{
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
 int SrsClient::get_peer_ip()
 {
 	int ret = ERROR_SUCCESS;
diff --git a/trunk/src/core/srs_core_client.hpp b/trunk/src/core/srs_core_client.hpp
index 5f030fda9..266745a4a 100755
--- a/trunk/src/core/srs_core_client.hpp
+++ b/trunk/src/core/srs_core_client.hpp
@@ -50,6 +50,7 @@ public:
 protected:
 	virtual int do_cycle();
 private:
+	virtual int streaming_play();
 	virtual int get_peer_ip();
 };
 
diff --git a/trunk/src/core/srs_core_error.hpp b/trunk/src/core/srs_core_error.hpp
index f43f003a2..2cefff4fb 100755
--- a/trunk/src/core/srs_core_error.hpp
+++ b/trunk/src/core/srs_core_error.hpp
@@ -59,8 +59,10 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_RTMP_MESSAGE_DECODE		307
 #define ERROR_RTMP_MESSAGE_ENCODE		308
 #define ERROR_RTMP_AMF0_ENCODE			309
+#define ERROR_RTMP_CHUNK_SIZE			310
 
 #define ERROR_SYSTEM_STREAM_INIT		400
 #define ERROR_SYSTEM_PACKET_INVALID		401
+#define ERROR_SYSTEM_CLIENT_INVALID		402
 
 #endif
\ No newline at end of file
diff --git a/trunk/src/core/srs_core_protocol.cpp b/trunk/src/core/srs_core_protocol.cpp
index 9a6b5c272..666181645 100755
--- a/trunk/src/core/srs_core_protocol.cpp
+++ b/trunk/src/core/srs_core_protocol.cpp
@@ -50,20 +50,6 @@ with IDs 3-6 are reserved for usage of RTMP. Protocol message with ID
 #define RTMP_MSG_SetPeerBandwidth 			0x06
 #define RTMP_MSG_EdgeAndOriginServerCommand 0x07
 /**
-* The server sends this event to test whether the client is reachable. 
-* 
-* Event data is a 4-byte timestamp, representing the local server time when the server dispatched the command. 
-* The client responds with PingResponse on receiving PingRequest.
-*/
-#define RTMP_MSG_PCUC_PingRequest 			0x06
-
-/**
-* The client sends this event to the server in response to the ping request. 
-* 
-* The event data is a 4-byte timestamp, which was received with the PingRequest request.
-*/
-#define RTMP_MSG_PCUC_PingResponse 			0x07
-/**
 3. Types of messages
 The server and the client send messages over the network to
 communicate with each other. The messages can be of any type which
@@ -184,6 +170,7 @@ messages.
 * independently for each direction.
 */
 #define RTMP_DEFAULT_CHUNK_SIZE 			128
+#define RTMP_MIN_CHUNK_SIZE 				2
 
 /**
 * 6.1. Chunk Format
@@ -316,7 +303,7 @@ int SrsProtocol::recv_message(SrsMessage** pmsg)
 		}
 		
 		if ((ret = on_recv_message(msg)) != ERROR_SUCCESS) {
-			srs_error("update context when received msg. ret=%d", ret);
+			srs_error("hook the received msg failed. ret=%d", ret);
 			delete msg;
 			return ret;
 		}
@@ -438,6 +425,11 @@ int SrsProtocol::send_message(SrsMessage* msg)
 		}
 	} while (p < (char*)msg->payload + msg->size);
 	
+	if ((ret = on_send_message(msg)) != ERROR_SUCCESS) {
+		srs_error("hook the send message failed. ret=%d", ret);
+		return ret;
+	}
+	
 	return ret;
 }
 
@@ -448,6 +440,7 @@ int SrsProtocol::on_recv_message(SrsMessage* msg)
 	srs_assert(msg != NULL);
 	
 	switch (msg->header.message_type) {
+		case RTMP_MSG_SetChunkSize:
 		case RTMP_MSG_WindowAcknowledgementSize:
 			if ((ret = msg->decode_packet()) != ERROR_SUCCESS) {
 				srs_error("decode packet from message payload failed. ret=%d", ret);
@@ -465,6 +458,36 @@ int SrsProtocol::on_recv_message(SrsMessage* msg)
 			srs_trace("set ack window size to %d", pkt->ackowledgement_window_size);
 			break;
 		}
+		case RTMP_MSG_SetChunkSize: {
+			SrsSetChunkSizePacket* pkt = dynamic_cast<SrsSetChunkSizePacket*>(msg->get_packet());
+			srs_assert(pkt != NULL);
+			
+			in_chunk_size = pkt->chunk_size;
+			
+			srs_trace("set input chunk size to %d", pkt->chunk_size);
+			break;
+		}
+	}
+	
+	return ret;
+}
+
+int SrsProtocol::on_send_message(SrsMessage* msg)
+{
+	int ret = ERROR_SUCCESS;
+	
+	srs_assert(msg != NULL);
+	
+	switch (msg->header.message_type) {
+		case RTMP_MSG_SetChunkSize: {
+			SrsSetChunkSizePacket* pkt = dynamic_cast<SrsSetChunkSizePacket*>(msg->get_packet());
+			srs_assert(pkt != NULL);
+			
+			in_chunk_size = pkt->chunk_size;
+			
+			srs_trace("set output chunk size to %d", pkt->chunk_size);
+			break;
+		}
 	}
 	
 	return ret;
@@ -1580,6 +1603,70 @@ int SrsSetWindowAckSizePacket::encode_packet(SrsStream* stream)
 	return ret;
 }
 
+SrsSetChunkSizePacket::SrsSetChunkSizePacket()
+{
+	chunk_size = RTMP_DEFAULT_CHUNK_SIZE;
+}
+
+SrsSetChunkSizePacket::~SrsSetChunkSizePacket()
+{
+}
+
+int SrsSetChunkSizePacket::decode(SrsStream* stream)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if (!stream->require(4)) {
+		ret = ERROR_RTMP_MESSAGE_DECODE;
+		srs_error("decode chunk size failed. ret=%d", ret);
+		return ret;
+	}
+	
+	chunk_size = stream->read_4bytes();
+	srs_info("decode chunk size success. chunk_size=%d", chunk_size);
+	
+	if (chunk_size < RTMP_MIN_CHUNK_SIZE) {
+		ret = ERROR_RTMP_CHUNK_SIZE;
+		srs_error("invalid chunk size. min=%d, actual=%d, ret=%d", 
+			ERROR_RTMP_CHUNK_SIZE, chunk_size, ret);
+		return ret;
+	}
+	
+	return ret;
+}
+
+int SrsSetChunkSizePacket::get_perfer_cid()
+{
+	return RTMP_CID_ProtocolControl;
+}
+
+int SrsSetChunkSizePacket::get_message_type()
+{
+	return RTMP_MSG_SetChunkSize;
+}
+
+int SrsSetChunkSizePacket::get_size()
+{
+	return 4;
+}
+
+int SrsSetChunkSizePacket::encode_packet(SrsStream* stream)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if (!stream->require(4)) {
+		ret = ERROR_RTMP_MESSAGE_ENCODE;
+		srs_error("encode chunk packet failed. ret=%d", ret);
+		return ret;
+	}
+	
+	stream->write_4bytes(chunk_size);
+	
+	srs_verbose("encode chunk packet success. ack_size=%d", chunk_size);
+	
+	return ret;
+}
+
 SrsSetPeerBandwidthPacket::SrsSetPeerBandwidthPacket()
 {
 	bandwidth = 0;
@@ -1624,3 +1711,47 @@ int SrsSetPeerBandwidthPacket::encode_packet(SrsStream* stream)
 	return ret;
 }
 
+SrsPCUC4BytesPacket::SrsPCUC4BytesPacket()
+{
+	event_type = 0;
+	event_data = 0;
+}
+
+SrsPCUC4BytesPacket::~SrsPCUC4BytesPacket()
+{
+}
+
+int SrsPCUC4BytesPacket::get_perfer_cid()
+{
+	return RTMP_CID_ProtocolControl;
+}
+
+int SrsPCUC4BytesPacket::get_message_type()
+{
+	return RTMP_MSG_UserControlMessage;
+}
+
+int SrsPCUC4BytesPacket::get_size()
+{
+	return 2 + 4;
+}
+
+int SrsPCUC4BytesPacket::encode_packet(SrsStream* stream)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if (!stream->require(6)) {
+		ret = ERROR_RTMP_MESSAGE_ENCODE;
+		srs_error("encode set bandwidth packet failed. ret=%d", ret);
+		return ret;
+	}
+	
+	stream->write_2bytes(event_type);
+	stream->write_4bytes(event_data);
+	
+	srs_verbose("encode PCUC packet success. "
+		"event_type=%d, event_data=%d", event_type, event_data);
+	
+	return ret;
+}
+
diff --git a/trunk/src/core/srs_core_protocol.hpp b/trunk/src/core/srs_core_protocol.hpp
index c09439c07..f43e14586 100755
--- a/trunk/src/core/srs_core_protocol.hpp
+++ b/trunk/src/core/srs_core_protocol.hpp
@@ -113,6 +113,10 @@ private:
 	*/
 	virtual int on_recv_message(SrsMessage* msg);
 	/**
+	* when message sentout, update the context.
+	*/
+	virtual int on_send_message(SrsMessage* msg);
+	/**
 	* try to recv interlaced message from peer,
 	* return error if error occur and nerver set the pmsg,
 	* return success and pmsg set to NULL if no entire message got,
@@ -532,6 +536,36 @@ protected:
 	virtual int encode_packet(SrsStream* stream);
 };
 
+/**
+* 7.1. Set Chunk Size
+* Protocol control message 1, Set Chunk Size, is used to notify the
+* peer about the new maximum chunk size.
+*/
+class SrsSetChunkSizePacket : public SrsPacket
+{
+private:
+	typedef SrsPacket super;
+protected:
+	virtual const char* get_class_name()
+	{
+		return CLASS_NAME_STRING(SrsSetChunkSizePacket);
+	}
+public:
+	int32_t chunk_size;
+public:
+	SrsSetChunkSizePacket();
+	virtual ~SrsSetChunkSizePacket();
+public:
+	virtual int decode(SrsStream* stream);
+public:
+	virtual int get_perfer_cid();
+public:
+	virtual int get_message_type();
+protected:
+	virtual int get_size();
+	virtual int encode_packet(SrsStream* stream);
+};
+
 /**
 * 5.6. Set Peer Bandwidth (6)
 * The client or the server sends this message to update the output
@@ -561,6 +595,57 @@ protected:
 	virtual int encode_packet(SrsStream* stream);
 };
 
+enum SrcPCUCEventType
+{
+	 // generally, 4bytes event-data
+	SrcPCUCStreamBegin 		= 0x00,
+	SrcPCUCStreamEOF 			= 0x01,
+	SrcPCUCStreamDry 			= 0x02,
+	SrcPCUCSetBufferLength 	= 0x03, // 8bytes event-data
+	SrcPCUCStreamIsRecorded 	= 0x04,
+	SrcPCUCPingRequest 		= 0x06,
+	SrcPCUCPingResponse 		= 0x07,
+};
+
+/**
+* for the EventData is 4bytes.
+* Stream Begin(=0)			4-bytes stream ID
+* Stream EOF(=1)			4-bytes stream ID
+* StreamDry(=2)				4-bytes stream ID
+* StreamIsRecorded(=4)		4-bytes stream ID
+* PingRequest(=6)			4-bytes timestamp local server time
+* PingResponse(=7)			4-bytes timestamp received ping request.
+* 
+* 3.7. User Control message
+* +------------------------------+-------------------------
+* | Event Type ( 2- bytes ) | Event Data
+* +------------------------------+-------------------------
+* Figure 5 Pay load for the ‘User Control Message’.
+*/
+class SrsPCUC4BytesPacket : public SrsPacket
+{
+private:
+	typedef SrsPacket super;
+protected:
+	virtual const char* get_class_name()
+	{
+		return CLASS_NAME_STRING(SrsPCUC4BytesPacket);
+	}
+public:
+	int16_t event_type;
+	int32_t event_data;
+public:
+	SrsPCUC4BytesPacket();
+	virtual ~SrsPCUC4BytesPacket();
+public:
+	virtual int get_perfer_cid();
+public:
+	virtual int get_message_type();
+protected:
+	virtual int get_size();
+	virtual int encode_packet(SrsStream* stream);
+};
+
 /**
 * expect a specified message, drop others util got specified one.
 * @pmsg, user must free it. NULL if not success.
diff --git a/trunk/src/core/srs_core_rtmp.cpp b/trunk/src/core/srs_core_rtmp.cpp
index 824f5c0bb..dcda1ea4d 100755
--- a/trunk/src/core/srs_core_rtmp.cpp
+++ b/trunk/src/core/srs_core_rtmp.cpp
@@ -303,6 +303,50 @@ int SrsRtmp::identify_client(int stream_id, SrsClientType& type, std::string& st
 	return ret;
 }
 
+int SrsRtmp::set_chunk_size(int chunk_size)
+{
+	int ret = ERROR_SUCCESS;
+	
+	SrsMessage* msg = new SrsMessage();
+	SrsSetChunkSizePacket* pkt = new SrsSetChunkSizePacket();
+	
+	pkt->chunk_size = chunk_size;
+	msg->set_packet(pkt);
+	
+	if ((ret = protocol->send_message(msg)) != ERROR_SUCCESS) {
+		srs_error("send set chunk size message failed. ret=%d", ret);
+		return ret;
+	}
+	srs_info("send set chunk size message success. chunk_size=%d", chunk_size);
+	
+	return ret;
+}
+
+int SrsRtmp::start_play(int stream_id)
+{
+	int ret = ERROR_SUCCESS;
+	
+	// StreamBegin
+	if (true) {
+		SrsMessage* msg = new SrsMessage();
+		SrsPCUC4BytesPacket* pkt = new SrsPCUC4BytesPacket();
+		
+		pkt->event_type = SrcPCUCStreamBegin;
+		pkt->event_data = stream_id;
+		msg->set_packet(pkt);
+		
+		if ((ret = protocol->send_message(msg)) != ERROR_SUCCESS) {
+			srs_error("send PCUC(StreamBegin) message failed. ret=%d", ret);
+			return ret;
+		}
+		srs_info("send PCUC(StreamBegin) message success.");
+	}
+	
+	srs_info("start play success.");
+	
+	return ret;
+}
+
 int SrsRtmp::identify_create_stream_client(SrsCreateStreamPacket* req, int stream_id, SrsClientType& type, std::string& stream_name)
 {
 	int ret = ERROR_SUCCESS;
@@ -343,7 +387,7 @@ int SrsRtmp::identify_create_stream_client(SrsCreateStreamPacket* req, int strea
 		SrsPacket* pkt = msg->get_packet();
 		if (dynamic_cast<SrsPlayPacket*>(pkt)) {
 			SrsPlayPacket* play = dynamic_cast<SrsPlayPacket*>(pkt);
-			type = SrsClientPublish;
+			type = SrsClientPlay;
 			stream_name = play->stream_name;
 			srs_trace("identity client type=play, stream_name=%s", stream_name.c_str());
 			return ret;
diff --git a/trunk/src/core/srs_core_rtmp.hpp b/trunk/src/core/srs_core_rtmp.hpp
index b106cff50..e9421b448 100755
--- a/trunk/src/core/srs_core_rtmp.hpp
+++ b/trunk/src/core/srs_core_rtmp.hpp
@@ -99,6 +99,15 @@ public:
 	* @type, output the client type.
 	*/
 	virtual int identify_client(int stream_id, SrsClientType& type, std::string& stream_name);
+	/**
+	* set the chunk size when client type identified.
+	*/
+	virtual int set_chunk_size(int chunk_size);
+	/**
+	* when client type is play, response with 
+	* StreamBegin, onStatus(NetStream.Play.Reset), onStatus(NetStream.Play.Start).
+	*/
+	virtual int start_play(int stream_id);
 private:
 	virtual int identify_create_stream_client(SrsCreateStreamPacket* req, int stream_id, SrsClientType& type, std::string& stream_name);
 };