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‎Demo/sgi/sv/README‎

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Demo programs for the SGI Video library for the Indigo (IRIX 4.0.5).
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These are more-or-less literal translations of the C programs from the
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Indigo Video Programming Guide, by Sjoerd Mullender, with minor
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changes by Guido.
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simpleinput.py Live video in a resizable window
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rgbgrab.py Grab still frames
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contcapt.py Continuous capturing (to a window)
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burstcapt.py Burst capturing

‎Demo/sgi/sv/burstcapt.py‎

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import sv, SV
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import gl, GL, DEVICE
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def main():
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format = SV.RGB8_FRAMES
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requestedwidth = SV.PAL_XMAX
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queuesize = 2
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v = sv.OpenVideo()
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svci = (format, requestedwidth, 0, queuesize, 0)
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svci, buffer, bitvec = v.CaptureBurst(svci)
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[bitvec]
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w, h = svci[1:3]
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framesize = w * h
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gl.prefposition(300, 300+w-1, 100, 100+h-1)
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gl.foreground()
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win = gl.winopen('Burst Capture')
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gl.RGBmode()
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gl.gconfig()
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gl.qdevice(DEVICE.LEFTMOUSE)
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gl.qdevice(DEVICE.ESCKEY)
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for i in range(svci[3]):
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inverted_frame = sv.RGB8toRGB32(1, \
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buffer[i*framesize:(i+1)*framesize], w, h)
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gl.lrectwrite(0, 0, w-1, h-1, inverted_frame)
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while 1:
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dev, val = gl.qread()
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if dev == DEVICE.LEFTMOUSE and val == 1:
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break
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if dev == DEVICE.REDRAW:
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gl.lrectwrite(0, 0, w-1, h-1, inverted_frame)
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if dev == DEVICE.ESCKEY:
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v.CloseVideo()
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gl.winclose(win)
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return
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v.CloseVideo()
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gl.winclose(win)
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main()

‎Demo/sgi/sv/contcapt.py‎

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import sys
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import sv, SV
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import gl, GL, DEVICE
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def main():
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format = SV.RGB8_FRAMES
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framerate = 25
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queuesize = 16
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samplingrate = 2
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v = sv.OpenVideo()
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# Determine maximum window size based on signal standard
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param = [SV.BROADCAST, 0]
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v.GetParam(param)
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if param[1] == SV.PAL:
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width = SV.PAL_XMAX
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height = SV.PAL_YMAX
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framefreq = 25
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else:
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width = SV.NTSC_XMAX
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height = SV.NTSC_YMAX
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framefreq = 30
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# Allow resizing window if capturing RGB frames, which can be scaled
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if format == SV.RGB8_FRAMES:
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gl.keepaspect(width, height)
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gl.maxsize(width, height)
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gl.stepunit(8, 6)
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gl.minsize(120, 90)
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else:
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if format == SV.YUV411_FRAMES_AND_BLANKING_BUFFER:
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height = height + SV.BLANKING_BUFFER_SIZE
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gl.prefposition(300, 300+width-1, 100, 100+height-1)
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# Open the window
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gl.foreground()
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win = gl.winopen('Continuous Capture')
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gl.RGBmode()
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gl.gconfig()
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if format == SV.RGB8_FRAMES:
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width, height = gl.getsize()
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gl.pixmode(GL.PM_SIZE, 8)
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else:
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gl.pixmode(GL.PM_SIZE, 32)
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svci = (format, width, height, queuesize, samplingrate)
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[svci]
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svci = v.InitContinuousCapture(svci)
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width, height = svci[1:3]
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[svci]
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hz = gl.getgdesc(GL.GD_TIMERHZ)
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gl.noise(DEVICE.TIMER0, hz / framerate)
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gl.qdevice(DEVICE.TIMER0)
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gl.qdevice(DEVICE.WINQUIT)
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gl.qdevice(DEVICE.WINSHUT)
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gl.qdevice(DEVICE.ESCKEY)
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ndisplayed = 0
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lastfieldID = 0
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while 1:
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dev, val = gl.qread()
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if dev == DEVICE.REDRAW:
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oldw = width
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oldh = height
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width, height = gl.getsize()
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if oldw != width or oldh != height:
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v.EndContinuousCapture()
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gl.viewport(0, width-1, 0, height-1)
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svci = (svci[0], width, height) + svci[3:]
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svci = v.InitContinuousCapture(svci)
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width, height = svci[1:3]
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[svci]
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if ndisplayed:
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print 'lost',
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print fieldID/(svci[4]*2) - ndisplayed,
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print 'frames'
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ndisplayed = 0
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elif dev == DEVICE.TIMER0:
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try:
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captureData, fieldID = v.GetCaptureData()
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except RuntimeError, val:
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if val <> 'no data available':
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print val
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continue
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if fieldID - lastfieldID <> 2*samplingrate:
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print lastfieldID, fieldID
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lastfieldID = fieldID
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if svci[0] == SV.RGB8_FRAMES:
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rgbbuf = captureData.InterleaveFields(1)
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else:
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rgbbuf = captureData.YUVtoRGB(1)
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captureData.UnlockCaptureData()
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gl.lrectwrite(0, 0, width-1, height-1, rgbbuf)
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ndisplayed = ndisplayed + 1
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elif dev in (DEVICE.ESCKEY, DEVICE.WINQUIT, DEVICE.WINSHUT):
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v.EndContinuousCapture()
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v.CloseVideo()
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gl.winclose(win)
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print fieldID, ndisplayed, svci[4]
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print 'lost', fieldID/(svci[4]*2) - ndisplayed,
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print 'frames'
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return
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main()

‎Demo/sgi/sv/rgbgrab.py‎

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import sys
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import sv, SV
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import gl, GL, DEVICE
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import time
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def main():
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v = sv.OpenVideo()
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# Determine maximum window size based on signal standard
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param = [SV.BROADCAST, 0]
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v.GetParam(param)
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if param[1] == SV.PAL:
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width = SV.PAL_XMAX
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height = SV.PAL_YMAX
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elif param[1] == SV.NTSC:
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width = SV.NTSC_XMAX
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height = SV.NTSC_YMAX
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else:
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print 'Unknown video standard', param[1]
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sys.exit(1)
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# Initially all windows are half size
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grabwidth, grabheight = width/2, height/2
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# Open still window
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gl.foreground()
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gl.prefsize(grabwidth, grabheight)
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still_win = gl.winopen('Grabbed frame')
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gl.keepaspect(width, height)
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gl.maxsize(width, height)
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gl.winconstraints()
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gl.RGBmode()
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gl.gconfig()
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gl.clear()
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gl.pixmode(GL.PM_SIZE, 8)
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# Open live window
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gl.foreground()
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gl.prefsize(grabwidth, grabheight)
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live_win = gl.winopen('Live video')
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gl.keepaspect(width, height)
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gl.maxsize(width, height)
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gl.winconstraints()
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# Bind live video
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v.SetSize(gl.getsize())
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v.BindGLWindow(live_win, SV.IN_REPLACE)
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print 'Use leftmouse to grab frame'
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gl.qdevice(DEVICE.LEFTMOUSE)
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gl.qdevice(DEVICE.WINQUIT)
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gl.qdevice(DEVICE.WINSHUT)
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gl.qdevice(DEVICE.ESCKEY)
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frame = None
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while 1:
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dev, val = gl.qread()
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if dev == DEVICE.LEFTMOUSE and val == 0:
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w, h, fields = v.CaptureOneFrame(SV.RGB8_FRAMES, \
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grabwidth, grabheight)
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frame = sv.InterleaveFields(1, fields, w, h)
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gl.winset(still_win)
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gl.lrectwrite(0, 0, w - 1, h - 1, frame)
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gl.winset(live_win)
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if dev in (DEVICE.ESCKEY, DEVICE.WINQUIT, DEVICE.WINSHUT):
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v.CloseVideo()
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gl.winclose(live_win)
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gl.winclose(still_win)
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break
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if dev == DEVICE.REDRAW and val == still_win:
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gl.winset(still_win)
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gl.reshapeviewport()
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gl.clear()
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grabwidth, grabheight = gl.getsize()
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if frame:
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gl.lrectwrite(0, 0, w - 1, h - 1, frame)
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gl.winset(live_win)
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if dev == DEVICE.REDRAW and val == live_win:
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v.SetSize(gl.getsize())
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v.BindGLWindow(live_win, SV.IN_REPLACE)
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main()

‎Demo/sgi/sv/simpleinput.py‎

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import sv, SV
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import gl, DEVICE
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def main():
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gl.foreground()
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gl.prefsize(SV.PAL_XMAX, SV.PAL_YMAX)
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win = gl.winopen('video test')
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v = sv.OpenVideo()
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params = [SV.VIDEO_MODE, SV.COMP, SV.BROADCAST, SV.PAL]
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v.SetParam(params)
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v.BindGLWindow(win, SV.IN_REPLACE)
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gl.qdevice(DEVICE.ESCKEY)
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gl.qdevice(DEVICE.WINQUIT)
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gl.qdevice(DEVICE.WINSHUT)
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while 1:
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dev, val = gl.qread()
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if dev in (DEVICE.ESCKEY, DEVICE.WINSHUT, DEVICE.WINQUIT):
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v.CloseVideo()
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gl.winclose(win)
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return
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main()

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