Hello,
I want to display with wxPython the images sent by an ip camera.
Getting the photos is not a problem:
page = urllib2.build_opener().open("http://192.168.1.3/Jpeg/CamImg.jpg
")
image = Image.open(cStringIO.StringIO(page.read()))
Then I display the images one by one with wx with a loop (4 to 8 Frames Per
Second, which is not quick enough). But it works well.
What I'd like to do is to display the frames in a continous mode, ie
'movie'.
The problem is that I can't manage to analyze the stream sent by the camera
whose address is: 'http://192.168.1.3/GetData.cgi
'
I tried to adapt the script mentioned here
(http://thread.gmane.org/gmane.comp.python.general/449768
) without success. See below.
My problem is that I don't know where to begin and where to stop the
extraction
of data (the stream of data is continous):
See the class below:
boundary = self.buffer.find(r"""--IPCamBoundary""")
begin = boundary + 43
end = self.buffer.rfind(r"""--IPCamBoundary""")
I'd appreciate that some help to understand what I should do.
Many thanks in advance for four help
Dominique
--------------------------------------------------------------------------
Below is some info that may be needed with a view to helping me:
>>> stream = urllib2.urlopen('http://192.168.1.3/GetData.cgi
')
>>> print stream.info
()
Date: Sat, 01 Feb 2003 05:30:42 GMT
Server: WYM/1.0
Connection: close
Content-Type: multipart/x-mixed-replace;boundary=IPCamBoundary
Last-Modified: Sat, 01 Feb 2003 05:30:42 GMT
Pragma: no-cache
Cache-Control: no-cache
Expires: 01 Jan 1970 00:00:00 GMT
>>> stream.readline()
'--IPCamBoundary\r\n'
>>> stream.readline()
'Content-Type: image/jpeg\r\n'
>>> stream.readline()
'\r\n'
>>> stream.readline()
'\xff\xd8\xff\xe2\x00\x06>;?b\xff\xe7\x00\x04\x00\x00\xff\xdb\x00C\x00\x04\x03\x03\x04\x03\x03\x04\x04\x04\x04\x05\x05\x04\x05\x06\n'
>>> and so on.
I tried to attach the code returned by the camera (with two
"--IPCamBoundary\r\n", which seem
to be the begining of a frame.) but it was rejected by the image-sig list...
-------------------------------------------------------------------------------
Script:
class myCamera(object):
def __init__(self, url = 'http://192.168.1.3/GetData.cgi
', param = None):
self.url = url
self.param = param
self.state = 0
self.buffer = ''
self.limit = 8092
def Start(self):
try:
self.fp = urllib2.build_opener().open(self.url)
except URLError:
print u"""Check connection"""
self.state = True
def Stop(self):
self.fp.close()
self.state = 0
def NextFrame(self):
if self.state:
temp = self.fp.read(self.limit)
self.buffer += temp
boundary = self.buffer.find(r"""--IPCamBoundary""")
count = self.buffer.count(r"""--IPCamBoundary""")
if boundary <> -1:
if count > 1:
begin = boundary + 43
end = self.buffer.rfind(r"""--IPCamBoundary""")
buff = self.buffer[boundary:end-1]
output = cStringIO.StringIO()
output.write(buff)
contents = output.getvalue()
image = Image.open(cStringIO.StringIO(contents))
output.close()
This script results in a traceback:
image = Image.open(cStringIO.StringIO(contents))
File "D:\Python26\lib\site-packages\PIL\Image.py", line 1980, in open
raise IOError("cannot identify image file")
IOError: cannot identify image file
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