jsGB28181协议代码

jsGB28181协议的具体实现涉及到一些网络编程和视频流处理等技术，需要结合具体的开发环境和开发语言进行实现。下面是一个基于Python语言的jsGB28181协议实现示例，仅供参考：

import socket
import time

class JSGB28181():
    def __init__(self, ip, port, device_id, username, password):
        self.ip = ip
        self.port = port
        self.device_id = device_id
        self.username = username
        self.password = password
        self.session_id = ""
        
    def login(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((self.ip, self.port))
        
        # 发送登录请求
        msg = "REGISTER sip:{}@{} SIP/2.0\r\n".format(self.device_id, self.ip)
        msg += "Via: SIP/2.0/TCP {}:{};branch=z9hG4bK776asdhds\r\n".format(self.ip, self.port)
        msg += "From: <sip:{}@{}>;tag=asdhds\r\n".format(self.device_id, self.ip)
        msg += "To: <sip:{}@{}>\r\n".format(self.device_id, self.ip)
        msg += "Call-ID: asdhds\r\n"
        msg += "Max-Forwards: 70\r\n"
        msg += "CSeq: 1 REGISTER\r\n"
        msg += "User-Agent: Python\r\n"
        msg += "Expires: 3600\r\n"
        msg += "Contact: <sip:{}@{}:{}>\r\n".format(self.device_id, self.ip, self.port)
        msg += "Authorization: Digest username=\"{}\", realm=\"{}\", nonce=\"123456\", uri=\"sip:{}@{}\", response=\"abcdefg\"\r\n".format(self.username, self.ip, self.device_id, self.ip)
        msg += "Content-Length: 0\r\n"
        msg += "\r\n"
        s.send(msg.encode())
        
        # 接收响应
        response = ""
        while True:
            data = s.recv(1024)
            if not data:
                break
            response += data.decode()
            if response.endswith("\r\n\r\n"):
                break
        
        # 解析响应
        if "200 OK" in response:
            lines = response.split("\r\n")
            for line in lines:
                if line.startswith("Session-ID:"):
                    self.session_id = line.split(":")[1].strip()
            return True
        else:
            return False
        
    def start_preview(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((self.ip, self.port))
        
        # 发送实时预览请求
        msg = "INVITE sip:{}@{} SIP/2.0\r\n".format(self.device_id, self.ip)
        msg += "Via: SIP/2.0/TCP {}:{};branch=z9hG4bK776asdhds\r\n".format(self.ip, self.port)
        msg += "From: <sip:{}@{}>;tag=asdhds\r\n".format(self.device_id, self.ip)
        msg += "To: <sip:{}@{}>\r\n".format(self.device_id, self.ip)
        msg += "Call-ID: asdhds\r\n"
        msg += "Max-Forwards: 70\r\n"
        msg += "CSeq: 2 INVITE\r\n"
        msg += "User-Agent: Python\r\n"
        msg += "Contact: <sip:{}@{}:{}>\r\n".format(self.device_id, self.ip, self.port)
        msg += "Content-Type: application/SDP\r\n"
        msg += "Session-ID: {}\r\n".format(self.session_id)
        msg += "Authorization: Digest username=\"{}\", realm=\"{}\", nonce=\"123456\", uri=\"sip:{}@{}\", response=\"abcdefg\"\r\n".format(self.username, self.ip, self.device_id, self.ip)
        msg += "Content-Length: 0\r\n"
        msg += "\r\n"
        s.send(msg.encode())
        
        # 接收响应
        response = ""
        while True:
            data = s.recv(1024)
            if not data:
                break
            response += data.decode()
            if response.endswith("\r\n\r\n"):
                break
        
        # 解析响应
        if "200 OK" in response:
            lines = response.split("\r\n")
            for line in lines:
                if line.startswith("Session-ID:"):
                    self.session_id = line.split(":")[1].strip()
                if line.startswith("m=video"):
                    video_port = line.split(" ")[1]
            # 开始接收视频流
            video_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            video_socket.bind((self.ip, int(video_port)))
            while True:
                data, addr = video_socket.recvfrom(65535)
                # 处理视频流
                self.process_video_stream(data)
        else:
            return False
        
    def process_video_stream(self, data):
        # 处理视频流数据
        pass
        
if __name__ == "__main__":
    # 创建jsGB28181对象
    device = JSGB28181("192.168.1.100", 5060, "34020000002000000001", "admin", "123456")
    # 登录
    if device.login():
        # 开始实时预览
        device.start_preview()
    else:
        print("登录失败")

注意：上述示例代码仅为演示用途，具体实现还需要根据实际情况进行调整和完善。