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130 lines
2.7 KiB
Python
Executable File
130 lines
2.7 KiB
Python
Executable File
#!/ufs/guido/bin/sgi/python-405
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# Receive live video UDP packets.
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# Usage: Vreceive [port]
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import sys
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import struct
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from socket import * # syscalls and support functions
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from SOCKET import * # <sys/socket.h>
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from IN import * # <netinet/in.h>
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import select
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import struct
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import gl, GL, DEVICE
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sys.path.append('/ufs/guido/src/video')
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import LiveVideoOut
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import regsub
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import getopt
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from senddefs import *
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def usage(msg):
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print msg
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print 'usage: Vreceive [-m mcastgrp] [-p port]'
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print '-m mcastgrp: multicast group (default ' + `DEFMCAST` + ')'
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print '-p port : port (default ' + `DEFPORT` + ')'
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sys.exit(2)
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def main():
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sys.stdout = sys.stderr
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group = DEFMCAST
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port = DEFPORT
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width = DEFWIDTH
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height = DEFHEIGHT
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'm:p:')
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except getopt.error, msg:
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usage(msg)
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try:
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for opt, optarg in opts:
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if opt == '-p':
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port = string.atoi(optarg)
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if opt == '-m':
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group = gethostbyname(optarg)
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except string.atoi_error, msg:
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usage('bad integer: ' + msg)
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s = opensocket(group, port)
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gl.foreground()
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gl.prefsize(width, height)
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wid = gl.winopen('Vreceive')
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gl.qdevice(DEVICE.ESCKEY)
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gl.qdevice(DEVICE.WINSHUT)
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gl.qdevice(DEVICE.WINQUIT)
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x, y = gl.getorigin()
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lvo = LiveVideoOut.LiveVideoOut().init(wid, (x, y, width, height), \
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width, height)
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ifdlist = [gl.qgetfd(), s.fileno()]
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ofdlist = []
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xfdlist = []
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timeout = 1.0
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selectargs = (ifdlist, ofdlist, xfdlist, timeout)
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while 1:
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if gl.qtest():
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dev, val = gl.qread()
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if dev in (DEVICE.ESCKEY, \
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DEVICE.WINSHUT, DEVICE.WINQUIT):
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break
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if dev == DEVICE.REDRAW:
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gl.clear()
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elif s.avail():
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data = s.recv(16*1024)
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pos, w, h = struct.unpack('hhh', data[:6])
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if (w, h) <> (width, height):
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x, y = gl.getorigin()
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y = y + height - h
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width, height = w, h
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lvo.close()
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lvo = LiveVideoOut.LiveVideoOut() \
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.init(wid, (x, y, width, height), \
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width, height)
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lvo.putnextpacket(pos, data[6:])
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else:
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x = select.select(selectargs)
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lvo.close()
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# Subroutine to create and properly initialize the receiving socket
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def opensocket(group, port):
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# Create the socket
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s = socket(AF_INET, SOCK_DGRAM)
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# Bind the port to it
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s.bind('', port)
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# Allow multiple copies of this program on one machine
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s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1) # (Not strictly needed)
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# Look up the group once
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group = gethostbyname(group)
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# Ugly: construct binary group address
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group_bytes = eval(regsub.gsub('\.', ',', group))
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grpaddr = 0
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for byte in group_bytes: grpaddr = (grpaddr << 8) | byte
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# Construct struct mreq from grpaddr and ifaddr
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ifaddr = INADDR_ANY
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mreq = struct.pack('ll', grpaddr, ifaddr)
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# Add group membership
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s.setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, mreq)
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return s
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main()
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