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‎Demo/sgi/video/README‎

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This directory contains Python and C code we wrote while we had a
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framegrabber board on loan from SGI.
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--Guido and Jack
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cam.py network real-time tv broadcast; see tv.py
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usage: cam [packfactor [host]]
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specifying 'all' for host broadcasts
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camcorder.py record video movies or make snapshots (in movie format)
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usage: camcorder [-c] [-a audiohost [-s]] [moviefile]
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-c color (default b/w, packfactor = 2)
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-a audiohost syncaudio is running on audiohost
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-s start syncaudio (on audiohost)
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moviefile (default film.video)
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keyboard commands:
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s stop grabbing (single step if already stopped)
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c continuous grabbing
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r start recording
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p pause recording (record single frame if paused)
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ESC quit
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statit.py various statistics operations on movie files
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syncaudio.py record audio synchronized with camcorder -a
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usage: syncaudio videohost soundfile
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soundfile format: 16 bits, 16khz, mono
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tv.py receiver for transmissions from cam.py
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video.py player for movies recorded by camcorder.py
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usage: video [moviefile [soundfile]]
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default moviefile is film.video
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default sound is no sound
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vinfo.py print a summary of a movie file
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vtime.py virtual time module imported by syncaudio.py and camcorder.py
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These are C programs, either for efficiency or because they need to
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link with a C library.
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squash.c make a movie smaller by averaging pixels
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usage: squash factor [bits] <moviefile >newmoviefile
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factor x and y compression factor
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bits #bits left per sample in result (default 8)
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squash2.c make a movie smaller by dropping pixels
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usage: squash2 factor <moviefile >newmoviefile
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factor x and y compression factor
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tomono.c like squash2 but outputs a monochrome movie
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v2i.c convert the first image of a movie file to SGI .rgb format
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link with -limage

‎Demo/sgi/video/cam.py‎

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import sys
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from socket import *
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from gl import *
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from GL import *
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from DEVICE import *
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from time import millitimer
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HS = 40 # Header size (must be same as in tv.py)
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# Rely on UDP packet (de)fragmentation for smoother images
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# (Changed for broadcast)
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MAX = 16000
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PF = 2 # Default packfactor
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# Default receiver station is voorn.
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# Kwik has no yellow pages, so...
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HOST = '192.16.201.121'
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PORT = 5555
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if sys.argv[1:]:
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PF = eval(sys.argv[1])
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if sys.argv[2:]:
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HOST = sys.argv[2]
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if HOST = 'all':
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HOST = '<broadcast>'
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MAX = 1400
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PF2 = PF*PF
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def main():
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centerx, centery = 400, 300
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foreground()
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wid = winopen('cam')
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RGBmode()
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doublebuffer()
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gconfig()
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qdevice(ESCKEY)
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w, h = getsize()
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ortho2(0, w, 0, h)
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w = w/PF*PF
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h = h/PF*PF
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readsource(SRC_FRAMEGRABBER)
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s = socket(AF_INET, SOCK_DGRAM)
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if HOST = '<broadcast>':
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s.allowbroadcast(1)
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addr = HOST, PORT
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bytesperline = w/PF2
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linesperchunk = MAX/bytesperline
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linesperchunk = linesperchunk/PF*PF
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nchunks = (h+linesperchunk-1)/linesperchunk
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print 'MAX=', MAX,
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print 'linesperchunk=', linesperchunk,
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print 'nchunks=', nchunks,
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print 'w=', w, 'h=', h
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x1, x2 = 0, w-1
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t1 = millitimer()
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nframes = 0
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fps = 0
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msg = ''
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while 1:
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while qtest():
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dev, val = qread()
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if dev = REDRAW:
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reshapeviewport()
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w, h = getsize()
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ortho2(0, w, 0, h)
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w = w/PF*PF
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h = h/PF*PF
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bytesperline = w/PF2
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linesperchunk = MAX/bytesperline
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linesperchunk = linesperchunk/PF*PF
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nchunks = (h+linesperchunk-1)/linesperchunk
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print 'MAX=', MAX,
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print 'linesperchunk=', linesperchunk,
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print 'nchunks=', nchunks,
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print 'w=', w, 'h=', h
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x1, x2 = 0, w-1
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fps = 0
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elif dev = ESCKEY:
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winclose(wid)
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return
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readsource(SRC_FRAMEGRABBER)
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nframes = nframes+1
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if nframes >= fps:
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t2 = millitimer()
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if t2 <> t1:
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fps = int(10000.0*nframes/(t2-t1)) * 0.1
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msg = `fps` + ' frames/sec'
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t1 = t2
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nframes = 0
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RGBcolor(255,255,255)
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cmov2i(9,9)
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charstr(msg)
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swapbuffers()
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rectcopy(centerx-w/2, centery-w/2, centerx+w/2, centery+w/2, 0, 0)
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for i in range(nchunks):
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y1 = i*linesperchunk
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y2 = y1 + linesperchunk-1
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if y2 >= h: y2 = h-1
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data = lrectread(x1, y1, x2, y2)
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data2 = packrect(x2-x1+1, y2-y1+1, PF, data)
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prefix = `w, h, PF, x1, y1, x2, y2`
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prefix = prefix + ' ' * (HS-len(prefix))
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data3 = prefix + data2
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s.sendto(data3, addr)
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main()

‎Demo/sgi/video/camcorder.py‎

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#!/ufs/guido/bin/sgi/python3.3
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from gl import *
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from GL import *
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from DEVICE import *
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import time
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import sys
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import getopt
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import socket
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import posix
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import vtime
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SYNCPORT = 10000
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CTLPORT = 10001
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VP_GBXORG = 0x1000001
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VP_GBYORG = 0x1000002
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VP_FBXORG = 0x1000003
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VP_FBYORG = 0x1000004
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VP_WIDTH = 0x1000005
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VP_HEIGHT = 0x1000006
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class Struct(): pass
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epoch = Struct()
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def getvideosize():
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w = getvideo(VP_WIDTH)
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h = getvideo(VP_HEIGHT)
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print getvideo(VP_GBXORG), getvideo(VP_GBYORG)
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print getvideo(VP_FBXORG), getvideo(VP_FBYORG)
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x = 0
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y = 0
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return x,y,w,h
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def saveframe(f,x,y,w,h,pf, notime):
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readsource(SRC_FRONT)
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if pf:
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w = w/pf*pf
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h = h/pf*pf
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data = None
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data = lrectread(x,y,x+w-1,y+h-1)
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if pf: data = packrect(w,h,pf,data)
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if notime: t = 0
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else: t = time.millitimer()-epoch.epoch
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f.write(`t` + ',' + `len(data)` + '\n')
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f.write(data)
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readsource(SRC_FRAMEGRABBER)
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def drawframe(x,y,w,h,col):
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drawmode(OVERDRAW)
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color(col)
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bgnline()
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v2i(x-1,y-1) ; v2i(x+w,y-1); v2i(x+w,y+h); v2i(x-1,y+h); v2i(x-1,y-1)
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endline()
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drawmode(NORMALDRAW)
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def main():
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foreground()
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pf = 2
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ausync = 0
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austart = 0
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optlist, args = getopt.getopt(sys.argv[1:],'ca:s')
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for opt, arg in optlist:
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if opt = '-c':
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pf = 0
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elif opt = '-a':
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ausync = 1
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aumachine = arg
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elif opt = '-s':
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austart = 1
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else:
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print 'Usage: camcorder [-c] [-a audiomachine [-s]]'
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sys.exit(1)
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if austart:
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if not ausync:
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print 'Cannot use -s without -a'
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sys.exit(1)
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print 'Starting audio recorder...'
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posix.system('rsh '+aumachine+' syncrecord '+socket.gethostname()+' &')
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if ausync:
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print 'Syncing to audio recorder...'
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globtime = vtime.VTime().init(1,aumachine,SYNCPORT)
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ctl = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
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ctl.bind((socket.gethostname(),CTLPORT))
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aua = (socket.gethostbyname(aumachine), CTLPORT)
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print 'Done.'
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vidx, vidy, w, h = getvideosize()
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prefsize(w,h)
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win = winopen('Camcorder')
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if len(args) > 1:
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f = open(args, 'w')
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else:
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f = open('film.video', 'w')
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w, h = getsize()
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realw, realh = w, h
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doublebuffer()
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RGBmode()
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gconfig()
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qdevice(LEFTMOUSE)
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qdevice(RKEY)
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qdevice(SKEY)
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qdevice(CKEY)
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qdevice(PKEY)
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qdevice(ESCKEY)
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inrunning = 1
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outrunning = 0
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stop = 'stop'
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readsource(SRC_FRAMEGRABBER)
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mousing = 0
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epoch.epoch = time.millitimer()
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stoptime = epoch.epoch
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sizewritten = 0
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x, y = realw/4, realh/4
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w, h = w/2, h/2
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drawframe(x,y,w,h,1)
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nframe = 0
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try:
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num = 0
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while 1:
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insingle = 0
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outsingle = 0
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if mousing:
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drawframe(x,y,w,h,0)
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ox, oy = getorigin()
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if sizewritten:
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x = getvaluator(MOUSEX)-ox
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y = getvaluator(MOUSEY)-oy
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else:
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w = getvaluator(MOUSEX)-x-ox
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h = getvaluator(MOUSEY)-y-oy
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drawframe(x,y,w,h,1)
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if qtest():
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ev, val = qread()
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if ev = LEFTMOUSE and val = 1:
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drawframe(x,y,w,h,0)
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mousing = 1
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ox, oy = getorigin()
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x = getvaluator(MOUSEX)-ox
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y = getvaluator(MOUSEY)-oy
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elif ev = LEFTMOUSE and val = 0:
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mousing = 0
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if not sizewritten:
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f.write('CMIF video 1.0\n')
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f.write(`w,h,pf` + '\n')
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sizewritten = 1
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if ev = RKEY and val = 1:
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if not inrunning:
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ringbell()
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else:
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outrunning = 1
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wasstopped = time.millitimer() - stoptime
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epoch.epoch = epoch.epoch + wasstopped
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nframe = 0
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starttime = time.millitimer()
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if ausync:
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ctl.sendto(`(1,starttime)`, aua)
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elif ev = PKEY and val = 1 and outrunning:
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outrunning = 0
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stoptime = time.millitimer()
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if ausync:
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ctl.sendto(`(0,stoptime)`, aua)
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nf = nframe * 1000.0 / (time.millitimer()-starttime)
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drawmode(OVERDRAW)
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color(0)
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clear()
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color(1)
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cmov2i(5,5)
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charstr('Recorded ' + `nf` + ' frames/sec')
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drawmode(NORMALDRAW)
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elif ev = PKEY and val = 1 and not outrunning:
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outsingle = 1
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elif ev = CKEY and val = 1:
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inrunning = 1
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elif ev = SKEY and val = 1:
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if outrunning:
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ringbell()
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elif inrunning:
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inrunning = 0
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else:
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insingle = 1
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elif ev = ESCKEY:
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if ausync:
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ctl.sendto(`(2,time.millitimer())`, aua)
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raise stop
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if inrunning or insingle:
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rectcopy(vidx,vidy,realw,realh,0,0)
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swapbuffers()
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if outrunning or outsingle:
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nframe = nframe + 1
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if not sizewritten:
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f.write('CMIF video 1.0\n')
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f.write(`w,h,pf` + '\n')
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sizewritten = 1
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saveframe(f, x, y, w, h, pf, outsingle)
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except stop:
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pass
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drawmode(OVERDRAW)
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color(0)
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clear()
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#
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main()

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