DisplayVideoIn - Class similar to LiveVideoIn but sends data from
screen
Dsend - Main program analogous to Vsend to send data from display
diff --git a/Demo/sgi/video/DisplayVideoIn.py b/Demo/sgi/video/DisplayVideoIn.py
new file mode 100755
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+++ b/Demo/sgi/video/DisplayVideoIn.py
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+# 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
+ return self
+
+ # 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