[gst-devel] Segfault in gstreamer

[Oscar Acena]

Hello to all!

And thanks for your great work. I think that gstreamer is very usefull, 
so i use it. But, i have found some thing that returns me an error. The 
thing is that i'm writting an application in python which inherits from 
gst.BaseSrc. In the main function (do_create, or do_render if it is a 
Sink), i need to see if a variable is empty or not. If is empty, i must 
wait for it to be not empty and then return. The problem is that i use 
sleep (or select) in this loop. Here is my problem: when i call sleep, 
it crashes. I do not have any idea for this behaviour!

To show you an easy example, i modified your filesrc.py: only added the 
time.sleep(x) in the do_create() function. It crashes too.

Can someone tell me why this happens?

Thanks a lot in advance!

----------------
#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4

# GStreamer python bindings
# Copyright (C) 2002 David I. Lehn <dlehn at users.sourceforge.net>
#               2004 Johan Dahlin  <johan at gnome.org>
#
# filesrc.py: implements a file source element completely in python
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

import sys*, time*
import gobject
import pygst
pygst.require('0.10')
import gst

class FileSource(gst.BaseSrc):
    __gsttemplates__ = (
        gst.PadTemplate("src",
                        gst.PAD_SRC,
                        gst.PAD_ALWAYS,
                        gst.caps_new_any()),
        )

    blocksize = 4096
    fd = None
   
    def __init__(self, name):
        self.__gobject_init__()
        self.curoffset = 0
        self.set_name(name)
           
    def set_property(self, name, value):
        if name == 'location':
            self.fd = open(value, 'r')

    def do_create(self, offset, size):
     *   time.sleep(2)*
        if offset != self.curoffset:
            self.fd.seek(offset, 0)
        data = self.fd.read(self.blocksize)
        if data:
            self.curoffset += len(data)
            return gst.FLOW_OK, gst.Buffer(data)
        else:
            return gst.FLOW_UNEXPECTED, None
gobject.type_register(FileSource)

def main(args):
    if len(args) != 3:
        print 'Usage: %s input output' % (args[0])
        return -1
   
    bin = gst.Pipeline('pipeline')

    filesrc = FileSource('filesource')
    assert filesrc
    filesrc.set_property('location', args[1])
  
    filesink = gst.element_factory_make('filesink', 'sink')
    filesink.set_property('location', args[2])

    bin.add(filesrc, filesink)
    gst.element_link_many(filesrc, filesink)
   
    bin.set_state(gst.STATE_PLAYING);
    mainloop = gobject.MainLoop()

    def bus_event(bus, message):
        t = message.type
        if t == gst.MESSAGE_EOS:
            mainloop.quit()
        elif t == gst.MESSAGE_ERROR:
            err, debug = message.parse_error()
            print "Error: %s" % err, debug
            mainloop.quit()          
        return True
    bin.get_bus().add_watch(bus_event)

    mainloop.run()
    bin.set_state(gst.STATE_NULL)

if __name__ == '__main__':
   sys.exit(main(sys.argv))



		
______________________________________________ 
LLama Gratis a cualquier PC del Mundo. 
Llamadas a fijos y móviles desde 1 céntimo por minuto. 
http://es.voice.yahoo.com