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h264.py
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h264.py
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# !/usr/bin/python
# encoding: utf-8
# author: zhangtong
"""
视频转接核心处理模块包
"""
import os
import shutil
import time
import socket
import bitstring
import random
MAX_RTP_PKT_LEN = 1500
sn = {}
ji_shu = {}
rtp_dict = {} # {序号,数据内容}
rtp_shipin = {}
time_ = {}
# str111 = '' # 测试用的
# TODO 跳过字段 一般用不到
def parse_csrc(pkt, cc, lc):
for i in range(cc):
lc += 4
return lc
# TODO 跳过一些字段 一般用不到 为啥这么写我也不知道
def parse_ext_hdr(pkt, lc):
bt = bitstring.BitArray(bytes=pkt)
bc = 8 * lc + 16
lc = 4 + 4*bt[bc:bc + 16].uint
return lc
# TODO payload中取H264保存到文件
def parse_frame(pay, name_id):
global ji_shu
global time_
global rtp_shipin
rtp_shipin[name_id] += pay
# bt = bitstring.BitArray(bytes=pay)
if pay[:4] == b'\x00\x00\x01\xba': # \xba固定开头14位后边跟着这是第几帧图片 需要读帧数所以没加一 [13-14]
ji_shu[name_id] += 1
if ji_shu[name_id] % 100 == 0:
shutil.move('video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat.tmp', 'video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat')
time_[name_id] = time.strftime('%Y%m%d%H%M%S', time.localtime(time.time()))
with open('video/' + name_id + '/' + name_id + '_' + time_[name_id] + '.dat.tmp', 'a', encoding='latin1') as f:
f.write(rtp_shipin[name_id].decode('latin1'))
rtp_shipin[name_id] = b''
# print('第', bt[8*13+8*(bt[8*13:8*14].uint & 7):8*14+8*(bt[8*13:8*14].uint & 7)].uint, '帧')
# 8*原因是因为bt是按位算的不是字节
# elif pay[:4] == b'\x00\x00\x01\xe0': # \xe0第9位写着负载长度 需要之后的数据所以加一 [9-]
# if pay[9 + bt[8 * 8:8 * 9].uint:13 + bt[8 * 8:8 * 9].uint] == b'\x00\x00\x00\x01' and bt[8 * (13 + bt[8 * 8:8 * 9].uint) + 1:8 * (13 + bt[8 * 8:8 * 9].uint) + 3].uint == 0:
# if bt[8 * (13 + bt[8 * 8:8 * 9].uint) + 3:8 * (13 + bt[8 * 8:8 * 9].uint) + 8].uint == 6: # 补充增强信息单元，没用 删了试试
# return
# with open('video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat.tmp', 'a', encoding='latin1') as f:
# f.write(pay[9 + bt[8*8:8*9].uint:].decode('latin1'))
# else:
# with open('video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat.tmp', 'a', encoding='latin1') as f:
# f.write(pay.decode('latin1'))
if ji_shu[name_id] == 0:
if len(rtp_shipin[name_id]) > 140000:
with open('video/' + name_id + '/' + name_id + '_' + time_[name_id] + '.dat.tmp', 'a', encoding='latin1') as f:
f.write(rtp_shipin[name_id].decode('latin1'))
rtp_shipin[name_id] = b''
shutil.move('video/' + name_id + '/' + name_id + '_' + time_[name_id] + '.dat.tmp',
'video/' + name_id + '/' + name_id + '_' + time_[name_id] + '.dat')
time_[name_id] = time.strftime('%Y%m%d%H%M%S', time.localtime(time.time()))
# TODO 提取RTP包中payload
def recv_pkt(data, name_id):
global sn
global rtp_dict
# global str111
len_1 = len(data)
bt = bitstring.BitArray(bytes=data)
cc = bt[4:8].uint # 固定头部后面跟着的CSRC的数目
sn_1 = bt[16:32].uint # 序列号
lc = 12
lc = parse_csrc(data, cc, lc)
if bt[2]: # 如果该位置位，则该RTP包的尾部就包含附加的填充字节
len_1 -= bt[-8:].uint
if bt[3]: # 如果该位置位的话，RTP固定头部后面就跟有一个扩展头部
lc = parse_ext_hdr(data[lc:], lc*8)
# str111 += str(sn_1) + ' ' + str(len(data[lc:len_1])) + '\n'
if sn[name_id] == -1:
if bt[9:16].uint == 40:
sn[name_id] = bt[16:32].uint + 1
while rtp_dict[name_id].get(sn[name_id]):
parse_frame(rtp_dict[name_id].get(sn[name_id]), name_id)
rtp_dict[name_id].pop(sn[name_id])
sn[name_id] += 1
else:
rtp_dict[name_id][sn_1] = data[lc:len_1]
if len(rtp_dict[name_id]) == 10:
lin_shi = sorted(rtp_dict[name_id].keys())
for i in lin_shi:
parse_frame(rtp_dict[name_id][i], name_id)
rtp_dict[name_id].pop(i)
sn[name_id] = i+1
elif sn[name_id] == sn_1: # 按序号接包 皆大欢喜
parse_frame(data[lc:len_1], name_id)
sn[name_id] += 1
while rtp_dict[name_id].get(sn[name_id]):
parse_frame(rtp_dict[name_id].get(sn[name_id]), name_id)
rtp_dict[name_id].pop(sn[name_id])
sn[name_id] += 1
else:
rtp_dict[name_id][sn_1] = data[lc:len_1]
if len(rtp_dict[name_id]) == 10:
lin_shi = sorted(rtp_dict[name_id].keys())
for i in lin_shi:
parse_frame(rtp_dict[name_id][i], name_id)
rtp_dict[name_id].pop(i)
sn[name_id] = i+1
def main(name_id, port, time_now, local_ip1, local_port1):
global sn
global ji_shu
global time_
global rtp_dict
global rtp_shipin
time_[name_id] = time_now
sn[name_id] = -1
ji_shu[name_id] = 0
rtp_dict[name_id] = {}
rtp_shipin[name_id] = b''
with open('config.txt', 'r') as f:
str2 = f.read()
local_ip = str2[str2.find('ip=') + 3:str2.find('\n')]
address = (local_ip, port)
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(address)
s.settimeout(20)
if not os.path.exists('video/'+name_id+'/'):
os.makedirs('video/'+name_id+'/')
with open('video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat.tmp', 'w', encoding='latin1') as f:
pass
while True:
try:
data, addr = s.recvfrom(MAX_RTP_PKT_LEN)
except socket.timeout:
print("h264: ~Over {},端口: {} ,一共 {} 帧".format(name_id, port, ji_shu[name_id]))
try:
shutil.move('video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat.tmp', 'video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat')
except FileNotFoundError:
pass
str_send = 'del:{}'.format(name_id)
b4 = str_send.encode()
s.sendto(b4, (local_ip1, int(local_port1)))
# with open('1.txt', 'w')as f:
# f.write(str111)
break
if len(data) == 2:
if data.decode('latin1') == 'by':
print("h264: Over {},端口: {} ,一共 {} 帧".format(name_id, port, ji_shu[name_id]))
try:
shutil.move('video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat.tmp', 'video/'+name_id+'/'+name_id+'_'+time_[name_id]+'.dat')
except FileNotFoundError:
pass
# with open('1.txt', 'w')as f:
# f.write(str111)
break
recv_pkt(data, name_id)
s.close()
return
if __name__ == '__main__':
main(1, 6000, 20180202, 1, None)