diff --git a/trunk/configure b/trunk/configure
index 60445a4fa..07f5e62f8 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -86,7 +86,7 @@ MODULE_FILES=("srs_core" "srs_core_log" "srs_core_server"
         "srs_core_error" "srs_core_conn" "srs_core_client" 
         "srs_core_rtmp" "srs_core_socket" "srs_core_buffer"
         "srs_core_auto_free" "srs_core_protocol" "srs_core_amf0"
-        "srs_core_stream")
+        "srs_core_stream" "srs_core_source")
 MODULE_DIR="src/core" . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 
diff --git a/trunk/src/core/srs_core_client.cpp b/trunk/src/core/srs_core_client.cpp
index b36afb6b9..11195fa75 100755
--- a/trunk/src/core/srs_core_client.cpp
+++ b/trunk/src/core/srs_core_client.cpp
@@ -30,6 +30,10 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_rtmp.hpp>
 #include <srs_core_protocol.hpp>
 #include <srs_core_auto_free.hpp>
+#include <srs_core_source.hpp>
+
+// wait for client message.
+#define SRS_PULSE_TIME_MS 100
 
 SrsClient::SrsClient(SrsServer* srs_server, st_netfd_t client_stfd)
 	: SrsConnection(srs_server, client_stfd)
@@ -113,6 +117,11 @@ int SrsClient::do_cycle()
 	}
 	srs_verbose("set chunk size success");
 	
+	// find a source to publish.
+	SrsSource* source = SrsSource::find(req->get_stream_url());
+	srs_assert(source != NULL);
+	srs_info("source found, url=%s", req->get_stream_url().c_str());
+	
 	switch (type) {
 		case SrsClientPlay: {
 			srs_verbose("start to play stream %s.", req->stream.c_str());
@@ -122,7 +131,7 @@ int SrsClient::do_cycle()
 				return ret;
 			}
 			srs_info("start to play stream %s success", req->stream.c_str());
-			return streaming_play();
+			return streaming_play(source);
 		}
 		case SrsClientPublish: {
 			srs_verbose("start to publish stream %s.", req->stream.c_str());
@@ -132,7 +141,7 @@ int SrsClient::do_cycle()
 				return ret;
 			}
 			srs_info("start to publish stream %s success", req->stream.c_str());
-			return streaming_publish();
+			return streaming_publish(source);
 		}
 		default: {
 			ret = ERROR_SYSTEM_CLIENT_INVALID;
@@ -144,13 +153,58 @@ int SrsClient::do_cycle()
 	return ret;
 }
 
-int SrsClient::streaming_play()
+int SrsClient::streaming_play(SrsSource* source)
 {
 	int ret = ERROR_SUCCESS;
+	
+	SrsConsumer* consumer = source->create_consumer();
+	srs_assert(consumer != NULL);
+	SrsAutoFree(SrsConsumer, consumer, false);
+	srs_verbose("consumer created.");
+	
+	while (true) {
+		bool ready = false;
+		if ((ret = rtmp->can_read(SRS_PULSE_TIME_MS, ready)) != ERROR_SUCCESS) {
+			srs_error("wait client control message failed. ret=%d", ret);
+			return ret;
+		}
+		srs_verbose("client pulse %dms, ready=%d", SRS_PULSE_TIME_MS, ready);
+
+		// read from client.
+		if (ready) {
+			SrsMessage* msg = NULL;
+			if ((ret = rtmp->recv_message(&msg)) != ERROR_SUCCESS) {
+				srs_error("recv client control message failed. ret=%d", ret);
+				return ret;
+			}
+	
+			SrsAutoFree(SrsMessage, msg, false);
+			// TODO: process it.
+		}
+		
+		// get messages from consumer.
+		SrsMessage** msgs = NULL;
+		int count = 0;
+		if ((ret = consumer->get_packets(0, msgs, count)) != ERROR_SUCCESS) {
+			srs_error("get messages from consumer failed. ret=%d", ret);
+			return ret;
+		}
+		SrsAutoFree(SrsMessage*, msgs, true);
+		
+		// sendout messages
+		for (int i = 0; i < count; i++) {
+			SrsMessage* msg = msgs[i];
+			if ((ret = rtmp->send_message(msg)) != ERROR_SUCCESS) {
+				srs_error("send message to client failed. ret=%d", ret);
+				return ret;
+			}
+		}
+	}
+	
 	return ret;
 }
 
-int SrsClient::streaming_publish()
+int SrsClient::streaming_publish(SrsSource* source)
 {
 	int ret = ERROR_SUCCESS;
 	
@@ -163,6 +217,17 @@ int SrsClient::streaming_publish()
 
 		SrsAutoFree(SrsMessage, msg, false);
 		
+		// process audio packet
+		if (msg->header.is_audio() && ((ret = source->on_audio(msg)) != ERROR_SUCCESS)) {
+			srs_error("process audio message failed. ret=%d", ret);
+			return ret;
+		}
+		// process video packet
+		if (msg->header.is_video() && ((ret = source->on_video(msg)) != ERROR_SUCCESS)) {
+			srs_error("process video message failed. ret=%d", ret);
+			return ret;
+		}
+		
 		// process onMetaData
 		if (msg->header.is_amf0_data() || msg->header.is_amf3_data()) {
 			if ((ret = msg->decode_packet()) != ERROR_SUCCESS) {
@@ -173,6 +238,12 @@ int SrsClient::streaming_publish()
 			SrsPacket* pkt = msg->get_packet();
 			if (dynamic_cast<SrsOnMetaDataPacket*>(pkt)) {
 				SrsOnMetaDataPacket* metadata = dynamic_cast<SrsOnMetaDataPacket*>(pkt);
+				if ((ret = source->on_meta_data(metadata)) != ERROR_SUCCESS) {
+					srs_error("process onMetaData message failed. ret=%d", ret);
+					return ret;
+				}
+				srs_trace("process onMetaData message success.");
+				continue;
 			}
 			
 			srs_trace("ignore AMF0/AMF3 data message.");
diff --git a/trunk/src/core/srs_core_client.hpp b/trunk/src/core/srs_core_client.hpp
index a212ef8e7..f0062751a 100755
--- a/trunk/src/core/srs_core_client.hpp
+++ b/trunk/src/core/srs_core_client.hpp
@@ -35,6 +35,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 class SrsRtmp;
 class SrsRequest;
 class SrsResponse;
+class SrsSource;
 
 /**
 * the client provides the main logic control for RTMP clients.
@@ -52,8 +53,8 @@ public:
 protected:
 	virtual int do_cycle();
 private:
-	virtual int streaming_play();
-	virtual int streaming_publish();
+	virtual int streaming_play(SrsSource* source);
+	virtual int streaming_publish(SrsSource* source);
 	virtual int get_peer_ip();
 };
 
diff --git a/trunk/src/core/srs_core_error.hpp b/trunk/src/core/srs_core_error.hpp
index 2cefff4fb..f18c4e44a 100755
--- a/trunk/src/core/srs_core_error.hpp
+++ b/trunk/src/core/srs_core_error.hpp
@@ -48,6 +48,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_SOCKET_READ				207
 #define ERROR_SOCKET_READ_FULLY			208
 #define ERROR_SOCKET_WRITE				209
+#define ERROR_SOCKET_WAIT				210
 
 #define ERROR_RTMP_PLAIN_REQUIRED		300
 #define ERROR_RTMP_CHUNK_START			301
diff --git a/trunk/src/core/srs_core_protocol.cpp b/trunk/src/core/srs_core_protocol.cpp
index 4ee0a41ef..614bc73ca 100755
--- a/trunk/src/core/srs_core_protocol.cpp
+++ b/trunk/src/core/srs_core_protocol.cpp
@@ -273,6 +273,11 @@ SrsProtocol::~SrsProtocol()
 	srs_freep(skt);
 }
 
+int SrsProtocol::can_read(int timeout_ms, bool& ready)
+{
+	return skt->can_read(timeout_ms, ready);
+}
+
 int SrsProtocol::recv_message(SrsMessage** pmsg)
 {
 	*pmsg = NULL;
@@ -858,6 +863,16 @@ SrsMessageHeader::~SrsMessageHeader()
 {
 }
 
+bool SrsMessageHeader::is_audio()
+{
+	return message_type == RTMP_MSG_AudioMessage;
+}
+
+bool SrsMessageHeader::is_video()
+{
+	return message_type == RTMP_MSG_VideoMessage;
+}
+
 bool SrsMessageHeader::is_amf0_command()
 {
 	return message_type == RTMP_MSG_AMF0CommandMessage;
diff --git a/trunk/src/core/srs_core_protocol.hpp b/trunk/src/core/srs_core_protocol.hpp
index 0f436e157..07f086ba2 100755
--- a/trunk/src/core/srs_core_protocol.hpp
+++ b/trunk/src/core/srs_core_protocol.hpp
@@ -93,6 +93,10 @@ public:
 	SrsProtocol(st_netfd_t client_stfd);
 	virtual ~SrsProtocol();
 public:
+	/**
+	* whether the peer can read.
+	*/
+	virtual int can_read(int timeout_ms, bool& ready);
 	/**
 	* recv a message with raw/undecoded payload from peer.
 	* the payload is not decoded, use srs_rtmp_expect_message<T> if requires 
@@ -179,6 +183,8 @@ struct SrsMessageHeader
 	SrsMessageHeader();
 	virtual ~SrsMessageHeader();
 
+	bool is_audio();
+	bool is_video();
 	bool is_amf0_command();
 	bool is_amf0_data();
 	bool is_amf3_command();
diff --git a/trunk/src/core/srs_core_rtmp.cpp b/trunk/src/core/srs_core_rtmp.cpp
index 2dc51ca62..1dcb3c58e 100755
--- a/trunk/src/core/srs_core_rtmp.cpp
+++ b/trunk/src/core/srs_core_rtmp.cpp
@@ -112,6 +112,16 @@ int SrsRequest::discovery_app()
 	return ret;
 }
 
+std::string SrsRequest::get_stream_url()
+{
+	std::string url = vhost;
+	
+	url += app;
+	url += stream;
+
+	return url;
+}
+
 SrsResponse::SrsResponse()
 {
 	stream_id = SRS_DEFAULT_SID;
@@ -132,6 +142,21 @@ SrsRtmp::~SrsRtmp()
 	srs_freep(protocol);
 }
 
+int SrsRtmp::recv_message(SrsMessage** pmsg)
+{
+	return protocol->recv_message(pmsg);
+}
+
+int SrsRtmp::can_read(int timeout_ms, bool& ready)
+{
+	return protocol->can_read(timeout_ms, ready);
+}
+
+int SrsRtmp::send_message(SrsMessage* msg)
+{
+	return protocol->send_message(msg);
+}
+
 int SrsRtmp::handshake()
 {
 	int ret = ERROR_SUCCESS;
@@ -178,11 +203,6 @@ int SrsRtmp::handshake()
 	return ret;
 }
 
-int SrsRtmp::recv_message(SrsMessage** pmsg)
-{
-	return protocol->recv_message(pmsg);
-}
-
 int SrsRtmp::connect_app(SrsRequest* req)
 {
 	int ret = ERROR_SUCCESS;
diff --git a/trunk/src/core/srs_core_rtmp.hpp b/trunk/src/core/srs_core_rtmp.hpp
index fdb496f56..8f29c08b1 100755
--- a/trunk/src/core/srs_core_rtmp.hpp
+++ b/trunk/src/core/srs_core_rtmp.hpp
@@ -62,6 +62,7 @@ struct SrsRequest
 	* disconvery vhost/app from tcUrl.
 	*/
 	virtual int discovery_app();
+	virtual std::string get_stream_url();
 };
 
 /**
@@ -99,8 +100,11 @@ public:
 	SrsRtmp(st_netfd_t client_stfd);
 	virtual ~SrsRtmp();
 public:
-	virtual int handshake();
 	virtual int recv_message(SrsMessage** pmsg);
+	virtual int can_read(int timeout_ms, bool& ready);
+	virtual int send_message(SrsMessage* msg);
+public:
+	virtual int handshake();
 	virtual int connect_app(SrsRequest* req);
 	virtual int set_window_ack_size(int ack_size);
 	/**
diff --git a/trunk/src/core/srs_core_socket.cpp b/trunk/src/core/srs_core_socket.cpp
index 210056b21..7708c2902 100755
--- a/trunk/src/core/srs_core_socket.cpp
+++ b/trunk/src/core/srs_core_socket.cpp
@@ -34,6 +34,26 @@ SrsSocket::~SrsSocket()
 {
 }
 
+int SrsSocket::can_read(int timeout_ms, bool& ready)
+{
+    ready = false;
+    int ret = ERROR_SUCCESS;
+    
+    // If the named file descriptor object is ready for I/O within the specified amount of time, 
+    // a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to 
+    // indicate the error
+    if(st_netfd_poll(stfd, POLLIN, timeout_ms * 1000) == -1){
+        if(errno == ETIME){
+            return ret;
+        }
+        
+        return ERROR_SOCKET_WAIT;
+    }
+    
+    ready = true;
+    return ret;
+}
+
 int SrsSocket::read(const void* buf, size_t size, ssize_t* nread)
 {
     int ret = ERROR_SUCCESS;
diff --git a/trunk/src/core/srs_core_socket.hpp b/trunk/src/core/srs_core_socket.hpp
index 6672db3b9..678306020 100755
--- a/trunk/src/core/srs_core_socket.hpp
+++ b/trunk/src/core/srs_core_socket.hpp
@@ -44,6 +44,7 @@ public:
     SrsSocket(st_netfd_t client_stfd);
     virtual ~SrsSocket();
 public:
+	virtual int can_read(int timeout_ms, bool& ready);
     virtual int read(const void* buf, size_t size, ssize_t* nread);
     virtual int read_fully(const void* buf, size_t size, ssize_t* nread);
     virtual int write(const void* buf, size_t size, ssize_t* nwrite);
diff --git a/trunk/src/core/srs_core_source.cpp b/trunk/src/core/srs_core_source.cpp
new file mode 100755
index 000000000..55fc3e6ba
--- /dev/null
+++ b/trunk/src/core/srs_core_source.cpp
@@ -0,0 +1,90 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <srs_core_source.hpp>
+
+#include <srs_core_log.hpp>
+#include <srs_core_protocol.hpp>
+
+std::map<std::string, SrsSource*> SrsSource::pool;
+
+SrsSource* SrsSource::find(std::string stream_url)
+{
+	if (pool.find(stream_url) == pool.end()) {
+		pool[stream_url] = new SrsSource(stream_url);
+		srs_verbose("create new source for url=%s", stream_url.c_str());
+	}
+	
+	return pool[stream_url];
+}
+
+SrsConsumer::SrsConsumer()
+{
+}
+
+SrsConsumer::~SrsConsumer()
+{
+}
+
+int SrsConsumer::get_packets(int max_count, SrsMessage**& msgs, int& count)
+{
+	msgs = NULL;
+	count = 0;
+	
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
+SrsSource::SrsSource(std::string _stream_url)
+{
+	stream_url = _stream_url;
+}
+
+SrsSource::~SrsSource()
+{
+}
+
+int SrsSource::on_meta_data(SrsOnMetaDataPacket* metadata)
+{
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
+int SrsSource::on_audio(SrsMessage* audio)
+{
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
+int SrsSource::on_video(SrsMessage* audio)
+{
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
+SrsConsumer* SrsSource::create_consumer()
+{
+	SrsConsumer* consumer = new SrsConsumer();
+	return consumer;
+}
+
diff --git a/trunk/src/core/srs_core_source.hpp b/trunk/src/core/srs_core_source.hpp
new file mode 100755
index 000000000..e44719df6
--- /dev/null
+++ b/trunk/src/core/srs_core_source.hpp
@@ -0,0 +1,85 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef SRS_CORE_SOURCE_HPP
+#define SRS_CORE_SOURCE_HPP
+
+/*
+#include <srs_core_source.hpp>
+*/
+
+#include <srs_core.hpp>
+
+#include <map>
+#include <string>
+
+class SrsMessage;
+class SrsOnMetaDataPacket;
+
+/**
+* the consumer for SrsSource, that is a play client.
+*/
+class SrsConsumer
+{
+public:
+	SrsConsumer();
+	virtual ~SrsConsumer();
+public:
+	/**
+	* get packets in consumer queue.
+	* @msgs SrsMessages*[], output the prt array.
+	* @count the count in array.
+	* @max_count the max count to dequeue, 0 to dequeue all.
+	*/
+	virtual int get_packets(int max_count, SrsMessage**& msgs, int& count);
+};
+
+/**
+* live streaming source.
+*/
+class SrsSource
+{
+private:
+	static std::map<std::string, SrsSource*> pool;
+public:
+	/**
+	* find stream by vhost/app/stream.
+	* @stream_url the stream url, for example, myserver.xxx.com/app/stream
+	* @return the matched source, never be NULL.
+	* @remark stream_url should without port and schema.
+	*/
+	static SrsSource* find(std::string stream_url);
+private:
+	std::string stream_url;
+public:
+	SrsSource(std::string _stream_url);
+	virtual ~SrsSource();
+public:
+	virtual int on_meta_data(SrsOnMetaDataPacket* metadata);
+	virtual int on_audio(SrsMessage* audio);
+	virtual int on_video(SrsMessage* video);
+public:
+	virtual SrsConsumer* create_consumer();
+};
+
+#endif
\ No newline at end of file
diff --git a/trunk/src/srs/srs.upp b/trunk/src/srs/srs.upp
index 932051ca7..6307a0a4d 100755
--- a/trunk/src/srs/srs.upp
+++ b/trunk/src/srs/srs.upp
@@ -14,6 +14,8 @@ file
     ..\core\srs_core_conn.cpp,
     ..\core\srs_core_client.hpp,
     ..\core\srs_core_client.cpp,
+    ..\core\srs_core_source.hpp,
+    ..\core\srs_core_source.cpp,
     ..\core\srs_core_rtmp.hpp,
     ..\core\srs_core_rtmp.cpp,
     ..\core\srs_core_protocol.hpp,