New modules LiveVideo{In,Out} (interfaces will change!).
New programs V{send,receive} to send/receive video over UDP.
Comment typo changed in Vaddcache.
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Guido van Rossum
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# Live video input class.
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# Note that importing this module attempts to initialize video.
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# Check if video is available.
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# There are three reasons for failure here:
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# (1) this version of Python may not have the sv or imageop modules;
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# (2) this machine may not have a video board;
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# (3) initializing the video board may fail for another reason.
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# The global variable have_video is set to true iff we reall do have video.
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try:
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import sv
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import SV
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import imageop
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try:
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v = sv.OpenVideo()
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have_video = 1
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except sv.error:
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have_video = 0
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except ImportError:
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have_video = 0
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# The live video input class.
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# Only instantiate this if have_video is true!
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class LiveVideoIn:
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# Initialize an instance.
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# Parameters:
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# - vw, vh specify the size of the video window.
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# This initializes continuous capture.
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def init(self, pktmax, vw, vh):
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if not have_video:
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raise RuntimeError, 'no video available'
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realvw = vh*SV.PAL_XMAX/SV.PAL_YMAX
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if realvw < vw:
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print 'Funny, image too narrow...'
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self.realwidth, self.realheight = v.QuerySize(realvw, vh)
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##print 'Recording video in size', \
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## self.realwidth, self.realheight
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self.width = vw
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self.height = vh
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self.x0 = (self.realwidth-self.width)/2
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self.x1 = self.x0 + self.width - 1
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self.y0 = (self.realheight-self.height)/2
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self.y1 = self.y0 + self.height - 1
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# Compute # full lines per packet
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self.lpp = pktmax / self.width
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self.pktsize = self.lpp*self.width
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##print 'lpp =', self.lpp, '; pktsize =', self.pktsize
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# Initialize capture
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v.SetSize(self.realwidth, self.realheight)
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dummy = v.InitContinuousCapture(SV.RGB8_FRAMES, \
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self.realwidth, self.realheight, 2, 5)
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self.data = None
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self.lpos = 0
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return self
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# Remove an instance.
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# This turns off continuous capture.
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def close(self):
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v.EndContinuousCapture()
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# Get the next video packet.
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# This returns (lpos, data) where:
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# - lpos is the line position
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# - data is a piece of data
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# The dimensions of data are:
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# - pixel depth = 1 byte
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# - scan line width = self.width (the vw argument to init())
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# - number of scan lines = self.lpp (PKTMAX / vw)
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def getnextpacket(self):
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if not self.data:
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try:
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cd, id = v.GetCaptureData()
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except sv.error:
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return None
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data = cd.InterleaveFields(1)
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cd.UnlockCaptureData()
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self.data = imageop.crop(data, 1, \
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self.realwidth, \
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self.realheight, \
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self.x0, self.y0, \
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self.x1, self.y1)
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self.lpos = 0
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data = self.data[:self.pktsize]
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self.data = self.data[self.pktsize:]
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lpos = self.lpos
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self.lpos = self.lpos + self.lpp
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return lpos, data
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# Live video output (display video on the screen, presumably from the net)
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import gl
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from VFile import Displayer
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# Video output (displayer) class.
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class LiveVideoOut:
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def init(self, wid, xywh, vw, vh):
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##print 'Init', wid, xywh
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##print 'video', vw, vw
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self.vw = vw
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self.vh = vh
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self.disp = Displayer().init()
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info = ('rgb8', vw, vh, 1, 8, 0, 0, 0, 0)
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self.disp.setinfo(info)
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self.wid = wid
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oldwid = gl.winget()
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gl.winset(wid)
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self.disp.initcolormap()
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self.resize(xywh)
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gl.winset(oldwid)
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return self
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def resize(self, (x, y, w, h)):
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oldwid = gl.winget()
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gl.winset(self.wid)
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##print 'Resize', x, y, w, h
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gl.winposition(x, x+w-1, y, y+h-1)
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gl.reshapeviewport()
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if w < self.vw or h < self.vh:
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self.toosmall = 1
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else:
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self.disp.xorigin = (w-self.vw)/2
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self.disp.yorigin = (h-self.vh)/2
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self.toosmall = 0
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##print 'VIDEO OFFSET:', \
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## self.disp.xorigin, self.disp.yorigin
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self.disp.clear()
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gl.winset(oldwid)
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def putnextpacket(self, pos, data):
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if self.toosmall:
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return
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oldwid = gl.winget()
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gl.winset(self.wid)
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nline = len(data)/self.vw
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if nline*self.vw <> len(data):
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print 'Incorrect-sized video fragment'
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self.disp.showpartframe(data, None, (0, pos, self.vw, nline))
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gl.winset(oldwid)
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def close(self):
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print 'Done video out'
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@ -10,7 +10,7 @@
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# Options:
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#
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# file ... : file(s) to inspect; default film.video
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# file ... : file(s) to modify; default film.video
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import sys
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#!/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 *
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import select
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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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PKTMAX = 16*1024
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WIDTH = 400
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HEIGHT = 300
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HOST = ''
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PORT = 5555
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def main():
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port = PORT
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if sys.argv[1:]:
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port = eval(sys.argv[1])
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width, height = WIDTH, HEIGHT
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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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s = socket(AF_INET, SOCK_DGRAM)
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s.bind(HOST, port)
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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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main()
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#!/ufs/guido/bin/sgi/python-405
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# Send live video UDP packets.
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# Usage: Vsend [host [port]]
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import sys
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import time
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import struct
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from socket import *
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import gl, GL, DEVICE
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sys.path.append('/ufs/guido/src/video')
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import LiveVideoIn
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import LiveVideoOut
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PKTMAX_UCAST = 16*1024 - 6
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PKTMAX_BCAST = 1450
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WIDTH = 400
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HEIGHT = 300
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HOST = '<broadcast>'
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PORT = 5555
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def main():
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if not LiveVideoIn.have_video:
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print 'Sorry, no video (use python-405 on roos)'
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sys.exit(1)
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host = HOST
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port = PORT
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if sys.argv[1:]:
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host = sys.argv[1]
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if sys.argv[2:]:
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port = eval(sys.argv[2])
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if host == '<broadcast>':
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pktmax = PKTMAX_BCAST
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else:
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pktmax = PKTMAX_UCAST
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gl.foreground()
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gl.prefsize(WIDTH, HEIGHT)
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wid = gl.winopen('Vsend')
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gl.keepaspect(WIDTH, HEIGHT)
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gl.stepunit(8, 6)
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gl.winconstraints()
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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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width, height = gl.getsize()
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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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lvi = LiveVideoIn.LiveVideoIn().init(pktmax, width, height)
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s = socket(AF_INET, SOCK_DGRAM)
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s.allowbroadcast(1)
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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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w, h = gl.getsize()
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x, y = gl.getorigin()
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if (w, h) <> (width, height):
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lvi.close()
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width, height = w, h
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lvi = LiveVideoIn.LiveVideoIn() \
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.init(pktmax, width, height)
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lvo.close()
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lvo = LiveVideoOut.LiveVideoOut() \
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.init(wid, \
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(x, y, width, height), \
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width, height)
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rv = lvi.getnextpacket()
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if not rv:
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time.millisleep(10)
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continue
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pos, data = rv
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lvo.putnextpacket(pos, data)
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hdr = struct.pack('hhh', pos, width, height)
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s.sendto(hdr + data, (host, port))
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lvi.close()
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lvo.close()
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main()
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