rename base message to ISrsMessage

@@ -320,12 +320,12 @@ int SrsProtocol::recv_message(SrsCommonMessage** pmsg)
 	return ret;
 }
 
-int SrsProtocol::send_message(SrsOutputableMessage* msg)
+int SrsProtocol::send_message(ISrsMessage* msg)
 {
 	int ret = ERROR_SUCCESS;
 	
 	// free msg whatever return value.
-	SrsAutoFree(SrsOutputableMessage, msg, false);
+	SrsAutoFree(ISrsMessage, msg, false);
 	
 	if ((ret = msg->encode_packet()) != ERROR_SUCCESS) {
 		srs_error("encode packet to message payload failed. ret=%d", ret);
@@ -479,10 +479,15 @@ int SrsProtocol::on_recv_message(SrsCommonMessage* msg)
 	return ret;
 }
 
-int SrsProtocol::on_send_message(SrsOutputableMessage* msg)
+int SrsProtocol::on_send_message(ISrsMessage* msg)
 {
 	int ret = ERROR_SUCCESS;
 	
+	if (!msg->can_decode()) {
+		srs_verbose("ignore the un-decodable message.");
+		return ret;
+	}
+	
 	SrsCommonMessage* common_msg = dynamic_cast<SrsCommonMessage*>(msg);
 	if (!msg) {
 		srs_verbose("ignore the shared ptr message.");
@@ -927,18 +932,18 @@ SrsChunkStream::~SrsChunkStream()
 	srs_freep(msg);
 }
 
-SrsOutputableMessage::SrsOutputableMessage()
+ISrsMessage::ISrsMessage()
 {
 	payload = NULL;
 	size = 0;
 }
 
-SrsOutputableMessage::~SrsOutputableMessage()
+ISrsMessage::~ISrsMessage()
 {	
 	free_payload();
 }
 
-void SrsOutputableMessage::free_payload()
+void ISrsMessage::free_payload()
 {
 	srs_freepa(payload);
 }
@@ -955,6 +960,11 @@ SrsCommonMessage::~SrsCommonMessage()
 	srs_freep(stream);
 }
 
+bool SrsCommonMessage::can_decode()
+{
+	return true;
+}
+
 int SrsCommonMessage::decode_packet()
 {
 	int ret = ERROR_SUCCESS;
@@ -1145,6 +1155,11 @@ void SrsSharedPtrMessage::free_payload()
 	}
 }
 
+bool SrsSharedPtrMessage::can_decode()
+{
+	return true;
+}
+
 int SrsSharedPtrMessage::initialize(SrsMessageHeader* header, char* payload, int size, int perfer_cid)
 {
 	int ret = ERROR_SUCCESS;

@@ -47,7 +47,7 @@ class SrsChunkStream;
 class SrsAmf0Object;
 class SrsAmf0Null;
 class SrsAmf0Undefined;
-class SrsOutputableMessage;
+class ISrsMessage;
 
 // convert class name to string.
 #define CLASS_NAME_STRING(className) #className
@@ -112,7 +112,7 @@ public:
 	* then sendout over socket.
 	* @msg this method will free it whatever return value.
 	*/
-	virtual int send_message(SrsOutputableMessage* msg);
+	virtual int send_message(ISrsMessage* msg);
 private:
 	/**
 	* when recv message, update the context.
@@ -121,7 +121,7 @@ private:
 	/**
 	* when message sentout, update the context.
 	*/
-	virtual int on_send_message(SrsOutputableMessage* msg);
+	virtual int on_send_message(ISrsMessage* msg);
 	/**
 	* try to recv interlaced message from peer,
 	* return error if error occur and nerver set the pmsg,
@@ -235,7 +235,7 @@ public:
 /**
 * message to output.
 */
-class SrsOutputableMessage
+class ISrsMessage
 {
 // 4.1. Message Header
 public:
@@ -251,10 +251,16 @@ public:
 	int32_t size;
 	int8_t* payload;
 public:
-	SrsOutputableMessage();
-	virtual ~SrsOutputableMessage();
+	ISrsMessage();
+	virtual ~ISrsMessage();
 protected:
 	virtual void free_payload();
+public:
+	/**
+	* whether message canbe decoded.
+	* only update the context when message canbe decoded.
+	*/
+	virtual bool can_decode() = 0;
 /**
 * encode functions.
 */
@@ -274,10 +280,10 @@ public:
 * common RTMP message defines in rtmp.part2.Message-Formats.pdf.
 * cannbe parse and decode.
 */
-class SrsCommonMessage : public SrsOutputableMessage
+class SrsCommonMessage : public ISrsMessage
 {
 private:
-	typedef SrsOutputableMessage super;
+	typedef ISrsMessage super;
 // decoded message payload.
 private:
 	SrsStream* stream;
@@ -285,6 +291,8 @@ private:
 public:
 	SrsCommonMessage();
 	virtual ~SrsCommonMessage();
+public:
+	virtual bool can_decode();
 /**
 * decode functions.
 */
@@ -324,10 +332,10 @@ public:
 * for audio/video/data message that need less memory copy.
 * and only for output.
 */
-class SrsSharedPtrMessage : public SrsOutputableMessage
+class SrsSharedPtrMessage : public ISrsMessage
 {
 private:
-	typedef SrsOutputableMessage super;
+	typedef ISrsMessage super;
 private:
 	struct SrsSharedPtr
 	{
@@ -346,6 +354,8 @@ public:
 protected:
 	virtual void free_payload();
 public:
+	virtual bool can_decode();
+public:
 	/**
 	* set the shared payload.
 	*/