mirror of https://github.com/python/cpython
108 lines
2.6 KiB
Python
108 lines
2.6 KiB
Python
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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()
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