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65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
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#!/usr/bin/env python2.2
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#
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# gst-python
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# Copyright (C) 2002 David I. Lehn
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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#
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# Author: David I. Lehn <dlehn@vt.edu>
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#
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import sys
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from gstreamer import *
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import gobject
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from identity import Identity
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from cp import filter
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class Rot13(Identity):
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def chain(self, pad, buf):
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# override Identity's chain
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data = gst_buffer_get_data(buf)
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data2 = ''
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# waste cycles
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for c in data:
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if c.isalpha():
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if c.islower():
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a = 'a'
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else:
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a = 'A'
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c = chr((((ord(c) - ord(a)) + 13) % 26) + ord(a))
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data2 = data2 + c
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newbuf = gst_buffer_new()
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gst_buffer_set_data(newbuf, data2)
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self.srcpad.push(newbuf)
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gobject.type_register(Rot13)
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def main():
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"A GStreamer Python subclassing example of a rot13 filter"
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gst_debug_set_categories(0)
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rot13 = Rot13()
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rot13.set_name('rot13')
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if not rot13:
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print 'could not create \"Rot13\" element'
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return -1
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return filter([rot13])
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if __name__ == '__main__':
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ret = main()
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sys.exit (ret)
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