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Thread: gst-python problem: refcount for gst.Buffer too big?
gst-python problem: refcount for gst.Buffer too big?
user name
 2006-04-21 05:01:47 
Hi all,

I'm trying to write a gst element in python, based on
GstBaseTransform. The core of such an element would be
"transform" and
"transform_ip" methods, with receive GstBuffer
arguments. Both of
these methods don't work for me, due to too large reference
count of
Buffers passed to them. By the way, the
"transform" method requires
"get_unit_size" virtual method to be
implemented, the patch is here:

http
://bugzilla.gnome.org/show_bug.cgi?id=339248

in "transform_ip", buffer refcount is 3, and
that makes the buffer unwritable
in "transform", both buffer refcounts are 2,
what makes output buffer
unwritable as well...

def transform_ip (self, outbuf):
    print outbuf.__grefcount__ # always prints 3
    return gst.FLOW_OK

def transform (self, inbuf, outbuf):
    print inbuf.__grefcount__ # always prints 2
    print outbuf.__grefcount__ # always prints 2
    return gst.FLOW_OK

"gst_buffer_is_writable" checks, that the buffer
refcount should be 1,
and gst-python uses just that to enable or disable data
writing to the
buffer. So, how can I solve (or maybe workaround) this
problem?
Thanks. --Artem


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gst-python problem: refcount for gst.Buffer too big?
user name
 2006-04-21 15:17:44 
Hi,

On 4/21/06, ԣ  <artfwogmail.com> wrote:
> Hi all,
>
> I'm trying to write a gst element in python, based on
> GstBaseTransform. The core of such an element would be
"transform" and
> "transform_ip" methods, with receive
GstBuffer arguments. Both of
> these methods don't work for me, due to too large
reference count of
> Buffers passed to them. By the way, the
"transform" method requires
> "get_unit_size" virtual method to be
implemented, the patch is here:
>
> http
://bugzilla.gnome.org/show_bug.cgi?id=339248
>
> in "transform_ip", buffer refcount is 3,
and that makes the buffer unwritable
> in "transform", both buffer refcounts are
2, what makes output buffer
> unwritable as well...
>
> def transform_ip (self, outbuf):
>     print outbuf.__grefcount__ # always prints 3
>     return gst.FLOW_OK
>
> def transform (self, inbuf, outbuf):
>     print inbuf.__grefcount__ # always prints 2
>     print outbuf.__grefcount__ # always prints 2
>     return gst.FLOW_OK
>
> "gst_buffer_is_writable" checks, that the
buffer refcount should be 1,
> and gst-python uses just that to enable or disable data
writing to the
> buffer. So, how can I solve (or maybe workaround) this
problem?
> Thanks. --Artem

  Would it be possible to see your code ? Seeing how you
name your
methods, I doubt it'll work properly.

  Otherwise, we did refcount once too much, the bug and
patch are
available here (I can't commit right now since cvs is
frozen) :

  http
://bugzilla.gnome.org/show_bug.cgi?id=339308

  Please comment on the bug if it doesn't solve your
issues.

  Edward

>
>
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web
services, security?
> Get stuff done quickly with pre-integrated technology
to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based
on Apache Geronimo
> http:/
/sel.as-us.falkag.net/sel?cmdlnk&kid0709&bid&am
p;3057&dat1642
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devellists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstream
er-devel
>


--
Edward Hervey
Junior developer / Fluendo S.L.
http://www.pitivi.org/

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