home *** CD-ROM | disk | FTP | other *** search
/ Celestin Apprentice 4 / Apprentice-Release4.iso / Source Code / C / Applications / Python 1.3 / source code / Demo / sgi / sv / contcapt.py < prev    next >
Encoding:
Text File  |  1995-12-17  |  2.6 KB  |  108 lines  |  [TEXT/R*ch]
  1. import sys
  2. import sv, SV
  3. import gl, GL, DEVICE
  4.  
  5. def main():
  6.     format = SV.RGB8_FRAMES
  7.     framerate = 25
  8.     queuesize = 16
  9.     samplingrate = 2
  10.  
  11.     v = sv.OpenVideo()
  12.     # Determine maximum window size based on signal standard
  13.     param = [SV.BROADCAST, 0]
  14.     v.GetParam(param)
  15.     if param[1] == SV.PAL:
  16.         width = SV.PAL_XMAX
  17.         height = SV.PAL_YMAX
  18.         framefreq = 25
  19.     else:
  20.         width = SV.NTSC_XMAX
  21.         height = SV.NTSC_YMAX
  22.         framefreq = 30
  23.  
  24.     # Allow resizing window if capturing RGB frames, which can be scaled
  25.     if format == SV.RGB8_FRAMES:
  26.         gl.keepaspect(width, height)
  27.         gl.maxsize(width, height)
  28.         gl.stepunit(8, 6)
  29.         gl.minsize(120, 90)
  30.     else:
  31.         if format == SV.YUV411_FRAMES_AND_BLANKING_BUFFER:
  32.             height = height + SV.BLANKING_BUFFER_SIZE
  33.         gl.prefposition(300, 300+width-1, 100, 100+height-1)
  34.  
  35.     # Open the window
  36.     gl.foreground()
  37.     win = gl.winopen('Continuous Capture')
  38.     gl.RGBmode()
  39.     gl.gconfig()
  40.     if format == SV.RGB8_FRAMES:
  41.         width, height = gl.getsize()
  42.         gl.pixmode(GL.PM_SIZE, 8)
  43.     else:
  44.         gl.pixmode(GL.PM_SIZE, 32)
  45.  
  46.     svci = (format, width, height, queuesize, samplingrate)
  47.     [svci]
  48.  
  49.     svci = v.InitContinuousCapture(svci)
  50.     width, height = svci[1:3]
  51.     [svci]
  52.  
  53.     hz = gl.getgdesc(GL.GD_TIMERHZ)
  54.     gl.noise(DEVICE.TIMER0, hz / framerate)
  55.     gl.qdevice(DEVICE.TIMER0)
  56.     gl.qdevice(DEVICE.WINQUIT)
  57.     gl.qdevice(DEVICE.WINSHUT)
  58.     gl.qdevice(DEVICE.ESCKEY)
  59.  
  60.     ndisplayed = 0
  61.     lastfieldID = 0
  62.  
  63.     while 1:
  64.         dev, val = gl.qread()
  65.         if dev == DEVICE.REDRAW:
  66.             oldw = width
  67.             oldh = height
  68.             width, height = gl.getsize()
  69.             if oldw != width or oldh != height:
  70.                 v.EndContinuousCapture()
  71.                 gl.viewport(0, width-1, 0, height-1)
  72.                 svci = (svci[0], width, height) + svci[3:]
  73.                 svci = v.InitContinuousCapture(svci)
  74.                 width, height = svci[1:3]
  75.                 [svci]
  76.                 if ndisplayed:
  77.                     print 'lost',
  78.                     print fieldID/(svci[4]*2) - ndisplayed,
  79.                     print 'frames'
  80.                 ndisplayed = 0
  81.         elif dev == DEVICE.TIMER0:
  82.             try:
  83.                 captureData, fieldID = v.GetCaptureData()
  84.             except sv.error, val:
  85.                 if val <> 'no data available':
  86.                     print val
  87.                 continue
  88.             if fieldID - lastfieldID <> 2*samplingrate:
  89.                 print lastfieldID, fieldID
  90.             lastfieldID = fieldID
  91.             if svci[0] == SV.RGB8_FRAMES:
  92.                 rgbbuf = captureData.InterleaveFields(1)
  93.             else:
  94.                 rgbbuf = captureData.YUVtoRGB(1)
  95.             captureData.UnlockCaptureData()
  96.             gl.lrectwrite(0, 0, width-1, height-1, rgbbuf)
  97.             ndisplayed = ndisplayed + 1
  98.         elif dev in (DEVICE.ESCKEY, DEVICE.WINQUIT, DEVICE.WINSHUT):
  99.             v.EndContinuousCapture()
  100.             v.CloseVideo()
  101.             gl.winclose(win)
  102.             print fieldID, ndisplayed, svci[4]
  103.             print 'lost', fieldID/(svci[4]*2) - ndisplayed,
  104.             print 'frames'
  105.             return
  106.  
  107. main()
  108.