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# Live video output (display video on the screen, presumably from the net)
import gl
from VFile import Displayer
# Video output (displayer) class.
class LiveVideoOut:
# Call this to initialize things. Arguments:
# wid: the window id where the video is to be displayed (centered)
# vw, vh: size of the video image to be displayed
def init(self, wid, vw, vh, type):
##print 'Init', wid, xywh
##print 'video', vw, vw
self.vw = vw
self.vh = vh
self.disp = Displayer().init()
if not type in ('rgb8', 'grey', 'mono'):
raise 'Incorrent live video output type'
info = (type, vw, vh, 1, 8, 0, 0, 0, 0)
self.disp.setinfo(info)
self.wid = wid
oldwid = gl.winget()
gl.winset(wid)
self.disp.initcolormap()
self.reshapewindow()
gl.winset(oldwid)
return self
# Call this in response to every REDRAW event for the window
# or if the window size has changed for other reasons.
def reshapewindow(self):
oldwid = gl.winget()
gl.winset(self.wid)
gl.reshapeviewport()
w, h = gl.getsize()
self.disp.xorigin = (w-self.vw)/2
self.disp.yorigin = (h-self.vh)/2
self.disp.clear()
gl.winset(oldwid)
# Call this to change the size of the video images being displayed.
# Implies reshapewindow().
def resizevideo(self, vw, vh):
self.vw, self.vh = vw, vh
self.disp.setsize(vw, vh)
self.reshapewindow()
# Call this to display the next video packet. Arguments:
# pos: line number where the packet begins
# data: image data of the packet
# (these correspond directly to the return values from
# LiveVideoIn.getnextpacket()).
def putnextpacket(self, pos, data):
if self.disp.format == 'mono':
# Unfortunately size-check is difficult for
# packed video
nline = (len(data)*8)/self.vw
else:
nline = len(data)/self.vw
if nline*self.vw <> len(data):
print 'Incorrect-sized video fragment ignored'
return
oldwid = gl.winget()
gl.winset(self.wid)
self.disp.showpartframe(data, None, (0, pos, self.vw, nline))
gl.winset(oldwid)
# Call this to close the window.
def close(self):
pass
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