从crtmpserver中看具体处理rtmp协议的流程2

2.client-----发送1776个bytes数据---->server

握手第二步

ignore the client's last handshake part buffer.Ignore(1536)

在处理

_handshakeCompleted = true;

_rtmpState = RTMP_STATE_DONE;

剩下240bytes数据在bool BaseRTMPProtocol::SignalInputData(IOBuffer &buffer)中处理(其实也还是原来的地方)

result = ProcessBytes(buffer);

bool BaseRTMPProtocol::ProcessBytes(IOBuffer &buffer)中处理

在这里每次只能处理128bytes的数据

a.先判断0x03的头switch (GETIBPOINTER(buffer)[0]&0x3f)

_selectedChannel = GETIBPOINTER(buffer)[0]&0x3f;

_channels[_selectedChannel].lastInHeaderType = GETIBPOINTER(buffer)[0] >> 6;

buffer.Ignore(1);

availableBytesCount -= 1;

读RMPT的head

跳过前面大于128bytes的字节,等到和下次的100bytes何在一起(100bytes要独自去掉0x03的包头),然后再一起进入中

bool BaseRTMPAppProtocolHandler::InboundMessageAvailable(BaseRTMPProtocol *pFrom, Header &headerIOBuffer &inputBuffer)

{

1).调用_rtmpProtocolSerializer.Deserialize(headerinputBuffer, request)

函数为

bool RTMPProtocolSerializer::Deserialize(Header &headerIOBuffer &buffer, Variant &message)

{

根据H_MT(header)来判断消息的类型,这里为

RM_HEADER_MESSAGETYPE_FLEX

最终还需要在bool RTMPProtocolSerializer::DeserializeInvoke(IOBuffer &bufferVariant &message)中利用_amf0来解码数据(分别是得到string类型的方法名和double类型的参数)

}

2).得到解码后的数据,存放到request

3).进入return InboundMessageAvailable(pFrom, request)对消息进行响应

switch ((uint8_tVH_MT(request)) {

case RM_HEADER_MESSAGETYPE_INVOKE:

{

return ProcessInvoke(pFromrequest);

}

}

4).具体需要处理的方法调用在

bool BaseRTMPAppProtocolHandler::ProcessInvoke(BaseRTMPProtocol *pFrom,

Variant &request) {

string functionName = request[RM_INVOKE][RM_INVOKE_FUNCTION];

uint32_t currentInvokeId = M_INVOKE_ID(request);

if (currentInvokeId != 0) {

if (_nextInvokeId[pFrom->GetId()] <= currentInvokeId) {

_nextInvokeId[pFrom->GetId()] = currentInvokeId + 1;

}

}

if (functionName == RM_INVOKE_FUNCTION_CONNECT) {

return ProcessInvokeConnect(pFromrequest);

}...

}中

这样就得出了291bytes的数据进行发送了...

5)connect方法调用进行处理

bool RTMPAppProtocolHandler::ProcessInvokeConnect(BaseRTMPProtocol *pFrom,

Variant &request) {

找到对应处理的app

获取flvplayback

再返回到中处理:

bool BaseRTMPAppProtocolHandler::InboundMessageAvailable(BaseRTMPProtocol *pFrom,Variant &request) {

case RM_HEADER_MESSAGETYPE_INVOKE:

{

return ProcessInvoke(pFromrequest);

}

}

}

6)再去ProcessInvoke中处理消息的调用

bool BaseRTMPAppProtocolHandler::ProcessInvoke(BaseRTMPProtocol *pFrom,

Variant &request) {

if (functionName == RM_INVOKE_FUNCTION_CONNECT) {

return ProcessInvokeConnect(pFromrequest);

...

}

7)真正的发送消息在这里完成

bool BaseRTMPAppProtocolHandler::ProcessInvokeConnect(BaseRTMPProtocol *pFrom,
		Variant & request) {
	//1. Send the channel specific messages
	Variant response = GenericMessageFactory::GetWinAckSize(2500000);
	if (!SendRTMPMessage(pFrom, response)) {
		FATAL("Unable to send message to client");
		return false;
	}
	response = GenericMessageFactory::GetPeerBW(2500000, RM_PEERBW_TYPE_DYNAMIC);
	if (!SendRTMPMessage(pFrom, response)) {
		FATAL("Unable to send message to client");
		return false;
	}

	//2. Initialize stream 0
	response = StreamMessageFactory::GetUserControlStreamBegin(0);
	if (!SendRTMPMessage(pFrom, response)) {
		FATAL("Unable to send message to client");
		return false;
	}

	//3. Send the connect result
	response = ConnectionMessageFactory::GetInvokeConnectResult(request);
	if (!SendRTMPMessage(pFrom, response)) {
		FATAL("Unable to send message to client");
		return false;
	}

	//4. Send onBWDone
	response = GenericMessageFactory::GetInvokeOnBWDone(1024 * 8);
	if (!SendRTMPMessage(pFrom, response)) {
		FATAL("Unable to send message to client");
		return false;
	}

	//5. Done
	return true;
}


 

8)看看具体是如何发送的

bool BaseRTMPAppProtocolHandler::SendRTMPMessage(BaseRTMPProtocol *pTo,
		Variant message, bool trackResponse) {
		case RM_HEADER_MESSAGETYPE_ABORTMESSAGE:
		{
			return pTo->SendMessage(message);
		}
}

 

又回到了

 

bool BaseRTMPProtocol::SendMessage(Variant & message) {
	//2. Send the message
	if (!_rtmpProtocolSerializer.Serialize(_channels[(uint32_t) VH_CI(message)],
			message, _outputBuffer, _outboundChunkSize)) {
		FATAL("Unable to serialize RTMP message");
		return false;
	}
#endif  /* ENFORCE_RTMP_OUTPUT_CHECKS */

	_txInvokes++;

	//3. Mark the connection as ready for outbound transfer
	return EnqueueForOutbound();
}


 

9)可以看到消息是需要序列化的

bool RTMPProtocolSerializer::Serialize(Channel &channel,
		Variant &message, IOBuffer &buffer, uint32_t chunkSize) {
		case RM_HEADER_MESSAGETYPE_WINACKSIZE:
		{
			result = SerializeWinAckSize(_internalBuffer, message[RM_WINACKSIZE]);
			break;
		}
	}

	//2. 检查调用结果
	if (!result) {
		FATAL("Unable to serialize message body");
		return false;
	}

	//3. 更新的消息长度
	VH_ML(message) = GETAVAILABLEBYTESCOUNT(_internalBuffer);

	//4. 提取头
	Header header;
	if (!Header::GetFromVariant(header, message[RM_HEADER])) {
		FATAL("Unable to read RTMP header: %s", STR(message.ToString()));
		return false;
	}

	//5. 检查和发送数据
	uint32_t available = 0;
	while ((available = GETAVAILABLEBYTESCOUNT(_internalBuffer)) != 0) {
		if (!header.Write(channel, buffer)) {
			FATAL("Unable to serialize message header");
			result = false;
		}
	如果超过了128,则发送两次,但是当前只有4bytes,所以进了else
		if (available >= chunkSize) {
			buffer.ReadFromInputBuffer(&_internalBuffer, 0, chunkSize);
			channel.lastOutProcBytes += chunkSize;
			_internalBuffer.Ignore(chunkSize);
		} else {
			buffer.ReadFromInputBuffer(&_internalBuffer, 0, available);
			channel.lastOutProcBytes += available;
			_internalBuffer.Ignore(available);
		}
	}
	channel.lastOutProcBytes = 0;

	//6. Done
	return result;
}


 

10)看看SerializeWinAckSize是如何处理的

bool RTMPProtocolSerializer::SerializeWinAckSize(IOBuffer &buffer, uint32_t value) {
	if (!_amf0.WriteUInt32(buffer, value, false)) {
		FATAL("Unable to write uint32_t value: %u", value);
		return false;
	}
	return true;
}

value这个时候的值为2500000,在这里他被amf序列化了

 

11)ProcessInvokeConnect在完成SerializeWinAckSize的第二步是GetPeerBW

bool BaseRTMPAppProtocolHandler::SendRTMPMessage(BaseRTMPProtocol *pTo, Variant message, bool trackResponse) {
		case RM_HEADER_MESSAGETYPE_ABORTMESSAGE:
		{
			return pTo->SendMessage(message);
		}
	}
}


 

写了4bytes数据

还是直接发送,也是走bool BaseRTMPProtocol::SendMessage(Variant & message) {}-----bool RTMPProtocolSerializer::Serialize(Channel &channel,Variant &messageIOBuffer &bufferuint32_t chunkSize) {

case RM_HEADER_MESSAGETYPE_PEERBW:

{

result = SerializeClientBW(_internalBuffer, message[RM_PEERBW]);

}

}------------------

bool RTMPProtocolSerializer::SerializeClientBW(IOBuffer &buffer, Variant value) {
	if (!_amf0.WriteUInt32(buffer, value[RM_PEERBW_VALUE], false)) {
		FATAL("Unable to write uint32_t value: %u",
				(uint32_t) value[RM_PEERBW_VALUE]);
		return false;
	}
	if (!_amf0.WriteUInt8(buffer, value[RM_PEERBW_TYPE], false)) {
		FATAL("Unable to write uint8_t value: %hhu",
				(uint8_t) value[RM_PEERBW_TYPE]);
		return false;
	}
	return true;
}

这回写了5bytes数据

 

12)ProcessInvokeConnect的第三步

//2. Initialize stream 0
response = StreamMessageFactory::GetUserControlStreamBegin(0);

bool BaseRTMPProtocol::SendMessage(Variant & message) {}-----
bool RTMPProtocolSerializer::Serialize(Channel &channel,Variant &message, IOBuffer &buffer, uint32_t chunkSize) {
	case RM_HEADER_MESSAGETYPE_USRCTRL:
		{
			result = SerializeUsrCtrl(_internalBuffer, message[RM_USRCTRL]);
			break;
		}
}


 

bool RTMPProtocolSerializer::SerializeUsrCtrl(IOBuffer &buffer, Variant message) {
	if (!_amf0.WriteInt16(buffer, message[RM_USRCTRL_TYPE], false)) {
		FATAL("Unable to write user control message type value");
		return false;
	}

	switch ((uint16_t) message[RM_USRCTRL_TYPE]) {
		...
		case RM_USRCTRL_TYPE_STREAM_IS_RECORDED:
		{
			if (!_amf0.WriteInt32(buffer, message[RM_USRCTRL_STREAMID], false)) {
				FATAL("Unable to write stream id from user control message");
				return false;
			}
			return true;
		}
		...
	}
}

这回写了6bytes数据

 

13)ProcessInvokeConnect的第四步

//3. Send the connect result
response = ConnectionMessageFactory::GetInvokeConnectResult(request);

bool BaseRTMPProtocol::SendMessage(Variant & message) {}-----
bool RTMPProtocolSerializer::Serialize(Channel &channel,Variant &message, IOBuffer &buffer, uint32_t chunkSize) {
	case RM_HEADER_MESSAGETYPE_INVOKE:
		{
			result = SerializeInvoke(_internalBuffer, message[RM_INVOKE]);
			break;
		}
}


 

bool RTMPProtocolSerializer::SerializeInvoke(IOBuffer &buffer,
		Variant &message) {
	functionName 这里为_result
	string functionName = message[RM_INVOKE_FUNCTION];
	if (!_amf0.WriteShortString(buffer, functionName)) {
		FATAL("Unable to write %s", STR(RM_INVOKE_FUNCTION));
		return false;
	}

	if (!_amf0.WriteDouble(buffer, message[RM_INVOKE_ID])) {
		FATAL("Unable to write %s", STR(RM_INVOKE_ID));
		return false;
	}

	FOR_MAP(message[RM_INVOKE_PARAMS], string, Variant, i) {
		if (!_amf0.Write(buffer, MAP_VAL(i))) {
			FATAL("Unable to serialize invoke parameter %s: %s",
					STR(MAP_KEY(i)),
					STR(message.ToString()));
			return false;
		}
	}

	return true;
}

这回写了189bytes数据,这里超过了128bytes,Serialize中的//5. Chunk and send the data要走if的

 

14)ProcessInvokeConnect的第五步

response = GenericMessageFactory::GetInvokeOnBWDone(1024 * 8);

bool BaseRTMPAppProtocolHandler::SendRTMPMessage(BaseRTMPProtocol *pTo,
		Variant message, bool trackResponse) {
	switch ((uint8_t) VH_MT(message)) {
		case RM_HEADER_MESSAGETYPE_INVOKE:
		{
			if (M_INVOKE_FUNCTION(message) != RM_INVOKE_FUNCTION_RESULT) {
				uint32_t invokeId = 0;
				if (!MAP_HAS1(_nextInvokeId, pTo->GetId())) {
					FATAL("Unable to get next invoke ID");
					return false;
				}
				if (trackResponse) {
					invokeId = _nextInvokeId[pTo->GetId()];
					_nextInvokeId[pTo->GetId()] = invokeId + 1;
					M_INVOKE_ID(message) = invokeId;
					//do not store stupid useless amount of data needed by onbwcheck
					if (M_INVOKE_FUNCTION(message) == RM_INVOKE_FUNCTION_ONBWCHECK)
						_resultMessageTracking[pTo->GetId()][invokeId] = _onBWCheckStrippedMessage;
					else
						_resultMessageTracking[pTo->GetId()][invokeId] = message;
				} else {
					M_INVOKE_ID(message) = (uint32_t) 0;
				}
				return pTo->SendMessage(message);
			}
			}
		}
	}
}


 

bool RTMPProtocolSerializer::Serialize(Channel &channel,
		Variant &message, IOBuffer &buffer, uint32_t chunkSize) {
	bool result = false;
	_internalBuffer.Ignore(GETAVAILABLEBYTESCOUNT(_internalBuffer));

	switch ((uint32_t) VH_MT(message)) {
		case RM_HEADER_MESSAGETYPE_INVOKE:
		{
			result = SerializeInvoke(_internalBuffer, message[RM_INVOKE]);
			break;
		}
	....
}


 

bool RTMPProtocolSerializer::SerializeInvoke(IOBuffer &buffer,
		Variant &message) {
	functionName 这里为onBWDone
	string functionName = message[RM_INVOKE_FUNCTION];
	if (!_amf0.WriteShortString(buffer, functionName)) {
		FATAL("Unable to write %s", STR(RM_INVOKE_FUNCTION));
		return false;
	}

	if (!_amf0.WriteDouble(buffer, message[RM_INVOKE_ID])) {
		FATAL("Unable to write %s", STR(RM_INVOKE_ID));
		return false;
	}

	FOR_MAP(message[RM_INVOKE_PARAMS], string, Variant, i) {
		if (!_amf0.Write(buffer, MAP_VAL(i))) {
			FATAL("Unable to serialize invoke parameter %s: %s",
					STR(MAP_KEY(i)),
					STR(message.ToString()));
			return false;
		}
	}

	return true;
}

最后一个Invoke写了30bytes数据

 

15)ProcessInvokeConnect终于执行完毕了

一共得到291bytes的数据

具体是这样的读取io----更加具体的细节

原来是4bytes+head的12bytes=16bytes

原来是5bytes+head的12bytes=17bytes

原来是6bytes+head的12bytes=18bytes

这里还是写12bytes,但是这里是要写functionName_result

原来是189bytes+head的12bytes=201bytes

但是超过了chunkSize,只能先写128bytes,现在一共有191bytes,那么临时存储区还有61bytes数据,需要再写一个1bytes的头,再写后面的61bytes,处理完之后一共有253bytes

下来还是要写functionNameonBWDone

因为之前写的也是functionName,所以这里的head长度是8bytes

原来是30bytes+head的8bytes=38bytes

最终得到的buffer为4+12+5+12+6+12+128+12+1+61+30+8bytes=291bytes

把这291bytes数据直接send给client

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