120702-1 RTP接收

照貓畫虎，東拼西湊的代碼。

總結

1.python 開始很方便的，就是有些不知從何下手的感受

2.基礎知識沒有，連字符串和列表也分不清楚

3.在shell中執行後，使用ctrl+C 終止如何釋放UDP的佔用？

 

#!/bin/python
# -*- coding: cp936 -*-

#最簡單的udpserver

import os
import sys
import logging
import socket
import binascii

logger = logging.getLogger("udp server")
logger.setLevel(logging.DEBUG)

ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
ch.setFormatter(formatter)
logger.addHandler(ch)
"""
logger.debug("debug message")
logger.info("info message")
logger.warn("warn message")
logger.error("error message")
logger.critical("critical message")
"""

 

   
"""
分析收到的數據包，避免拆包。

"""
def analy_data(data):
    try:
        nalu_head=data[16:20]
        #print nalu_head
        #print binascii.b2a_hex(nalu_head[0]),binascii.b2a_hex(nalu_head[1]),binascii.b2a_hex(nalu_head[2]),binascii.b2a_hex(nalu_head[3])
        print ''.join(['%02x ' %ord(c) for c in data[0:32]]) #列表解析
    finally:       
        return 0 #收到完整數據包

def udpserver(port):
    try:
        s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
        s.bind(("",port))
        total_data=''
        while True:
            data,addr = s.recvfrom(8192)
            if not data: break
            total_data = total_data + data
            res = analy_data(total_data)
            if res==0:
                total_data=''
    finally:               
        s.close()
       

 

   
"""

def main( argv ):

    listener = Listener( 7070 )
   
    debug( "waiting for a client" )
   
    try:
        while 1:
            client = listener.waitforclient()
            client.start()

    finally:
        listener.stop()
"""

if __name__ == "__main__":     logger.info("start udp at 2500")     udpserver(2500)