summaryrefslogtreecommitdiffstats
path: root/Demo/sgi/video/Vreceive.py
blob: 84aa5a531b3ec299595d802c8ea562019e856e5d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
#! /usr/bin/env python

# Receive live video UDP packets.
# Usage: Vreceive [port]

import sys
import struct
from socket import *			# syscalls and support functions
from SOCKET import *			# <sys/socket.h>
from IN import *			# <netinet/in.h>
import select
import struct
import gl, GL, DEVICE
sys.path.append('/ufs/guido/src/video')
import LiveVideoOut
import regsub
import getopt

from senddefs import *


# Print usage message and exit(2).

def usage(msg):
	print msg
	print 'usage: Vreceive [-m mcastgrp] [-p port] [-c type]'
	print '-m mcastgrp: multicast group (default ' + `DEFMCAST` + ')'
	print '-p port    : port (default ' + `DEFPORT` + ')'
	print '-c type    : signal type: rgb8, grey or mono (default rgb8)'
	sys.exit(2)


# Main program: parse options and main loop.

def main():

	sys.stdout = sys.stderr

	group = DEFMCAST
	port = DEFPORT
	width = DEFWIDTH
	height = DEFHEIGHT
	vtype = 'rgb8'

	try:
		opts, args = getopt.getopt(sys.argv[1:], 'm:p:c:')
	except getopt.error, msg:
		usage(msg)

	try:
		for opt, optarg in opts:
			if opt == '-p':
				port = string.atoi(optarg)
			if opt == '-m':
				group = gethostbyname(optarg)
			if opt == '-c':
				vtype = optarg
	except string.atoi_error, msg:
		usage('bad integer: ' + msg)

	s = opensocket(group, port)

	gl.foreground()
	gl.prefsize(width, height)
	wid = gl.winopen('Vreceive')
	gl.winconstraints()
	gl.qdevice(DEVICE.ESCKEY)
	gl.qdevice(DEVICE.WINSHUT)
	gl.qdevice(DEVICE.WINQUIT)

	lvo = LiveVideoOut.LiveVideoOut(wid, width, height, vtype)

	ifdlist = [gl.qgetfd(), s.fileno()]
	ofdlist = []
	xfdlist = []
	timeout = 1.0
	selectargs = (ifdlist, ofdlist, xfdlist, timeout)

	while 1:

		if gl.qtest():
			dev, val = gl.qread()
			if dev in (DEVICE.ESCKEY, \
				DEVICE.WINSHUT, DEVICE.WINQUIT):
				break
			if dev == DEVICE.REDRAW:
				lvo.reshapewindow()
		elif s.avail():
			data = s.recv(16*1024)
			pos, w, h = struct.unpack('hhh', data[:6])
			if (w, h) <> (width, height):
				x, y =  gl.getorigin()
				y = y + height - h
				gl.winposition(x, x+w-1, y, y+h-1)
				width, height = w, h
				lvo.resizevideo(width, height)
			lvo.putnextpacket(pos, data[6:])
		else:
			x = select.select(selectargs)

	lvo.close()


# Subroutine to create and properly initialize the receiving socket

def opensocket(group, port):

	# Create the socket
	s = socket(AF_INET, SOCK_DGRAM)

	# Allow multiple copies of this program on one machine
	s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1) # (Not strictly needed)

	# Bind the port to it
	s.bind('', port)

	# Look up the group once
	group = gethostbyname(group)

	# Construct binary group address
	group_bytes = eval(regsub.gsub('\.', ',', group))
	grpaddr = 0
	for byte in group_bytes: grpaddr = (grpaddr << 8) | byte

	# Construct struct mreq from grpaddr and ifaddr
	ifaddr = INADDR_ANY
	mreq = struct.pack('ll', grpaddr, ifaddr)

	# Add group membership
	s.setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, mreq)

	return s


main()