DisplayVideoIn.py :  » Mobile » Python-for-PalmOS » Python-1.5.2+reduced-1.0 » Demo » sgi » video » Python Open Source

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Python Open Source » Mobile » Python for PalmOS 
Python for PalmOS » Python 1.5.2 reduced 1.0 » Demo » sgi » video » DisplayVideoIn.py
# Live video input from display class.

import gl
import GL

# The live video input class.
# Only instantiate this if have_video is true!

class DisplayVideoIn:

  # Initialize an instance.  Arguments:
  # vw, vh: size of the video window data to be captured.
  # position defaults to 0, 0 but can be set later
  def __init__(self, pktmax, vw, vh, type):
    self.pktmax = pktmax
    self.realwidth, self.realheight = vw, vh
    if type <> 'rgb':
      raise 'Incorrent video data type', type
    self.type = type
    self.width = vw
    self.height = vh
    #
    # Open dummy window
    #
    gl.foreground()
    gl.noport()
    self.wid = gl.winopen('DisplayVideoIn')
    
    self.x0 = 0
    self.x1 = self.x0 + self.width - 1
    self.y0 = 0
    self.y1 = self.y0 + self.height - 1
    # Compute # full lines per packet
    self.lpp = pktmax / self.linewidth()
    if self.lpp <= 0:
      raise 'No lines in packet', self.linewidth()
    self.pktsize = self.lpp*self.linewidth()
    self.data = None
    self.old_data = None
    self.dataoffset = 0
    self.lpos = 0
    self.hints = 0

  # Change the size of the video being displayed.

  def resizevideo(self, vw, vh):
    self.width = vw
    self.height = vh
    self.x1 = self.x0 + self.width - 1
    self.y1 = self.y0 + self.height - 1

  def positionvideo(self, x, y):
    self.x0 = x
    self.y0 = y
    self.x1 = self.x0 + self.width - 1
    self.y1 = self.y0 + self.height - 1

  # Remove an instance.
  # This turns off continuous capture.

  def close(self):
    gl.winclose(self.wid)

  # Get the length in bytes of a video line
  def linewidth(self):
    return self.width*4

  # Get the next video packet.
  # This returns (lpos, data) where:
  # - lpos is the line position
  # - data is a piece of data
  # The dimensions of data are:
  # - pixel depth = 1 byte
  # - scan line width = self.width (the vw argument to __init__())
  # - number of scan lines = self.lpp (PKTMAX / vw)

  def getnextpacket(self):
    if not self.data or self.dataoffset >= len(self.data):
      self.old_data = self.data
      self.data = gl.readdisplay(self.x0, self.y0, \
          self.x1, self.y1, self.hints)
      self.dataoffset = 0
      self.lpos = 0
    data = self.data[self.dataoffset:self.dataoffset+self.pktsize]
    while self.old_data and \
        self.dataoffset+self.pktsize < len(self.data):
      odata = self.old_data[self.dataoffset: \
          self.dataoffset+self.pktsize]
      if odata <> data:
        break
      print 'skip', self.lpos
      self.lpos = self.lpos + self.lpp
      self.dataoffset = self.dataoffset + self.pktsize
      data = self.data[self.dataoffset:\
          self.dataoffset+self.pktsize]
    lpos = self.lpos
    self.dataoffset = self.dataoffset + self.pktsize
    self.lpos = self.lpos + self.lpp
    return lpos, data
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