problem while pushing data to multiple srcpads.

On Fri, 2007-02-02 at 10:02 +0530, Vinayak wrote:
> Hi all, 
> I am implementing the demuxer which will divide the
input stream into
> multiple.
> I wrote a function for request_new_pad which creates a
new srcpad
> new_from_template, now this one is associated with my
element by
> "gst_element_add_pad". And after that I keep
a pointers to alll such
> newly created srcpads. 
> 
Normally a demuxer will create dynamic pads, based on the
contents of
the stream, instead of the app requesting pads.

You also need to activate the pads (when requested in
>=PAUSED) before
adding them to the element so that they can be used for data
passing.

> I'm using default handlers for event passing ( which
apparently passes
> the down-stream events to all srcpads in that element)

> 
> In my chain function: When I try to push data to first
srcpad that
> fails..... it never returns and the next element never
gets a pushed
> buffer.. may be its waiting for some events tobe passed
down ? 
> Could it be a PreRolling issue ?
> 
> thanks in advance, 
> --vinayak 
> 
> Here is snappet of my code : 
> _request_new_pad() 
> {
>   MySplit *split= .....;
>   splitpad = gst_pad_new_from_template(templ, padname);

>   GST_PAD_ELEMENT_PRIVATE (splitpad) = split;
>   gst_pad_use_fixed_caps (splitpad);
>   gst_pad_set_event_function(splitpad, gst_src_event);
>   .
>   .
>   gst_element_add_pad(element, splitpad);
>   srcpads[index++] = splitpad; 
> }
> 
> _chain_func(GstPad *pad, GstBuffer *buffer)
> {
> 
>   for(i=0; i < n_srcpads; i++) {
>    if(somecondition) { 
>       outbuf = gst_buffer_new();
>    } 
>    .
>    .
>   (!GST_PAD_PEER (srcpads[i])) 
>      return;
> 
>    gst_pad_push (srcpads[i], outbuf);
> }

The return value of _push should tell you about the reason
for the
failure. You also need to pass this return value upstream
(possibly
combining the return values of all pads).

Wim

> 
>
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On Fri, 2007-02-02 at 15:12 +0530, Vinayak wrote:
> 
> On 2/2/07, Wim Taymans <wimfluendo.com> wrote:
>         On Fri, 2007-02-02 at 10:02 +0530, Vinayak
wrote:
>         > Hi all,
>         > I am implementing the demuxer which will
divide the input
>         stream into
>         > multiple.
>         > I wrote a function for request_new_pad
which creates a new
>         srcpad 
>         > new_from_template, now this one is
associated with my
>         element by
>         > "gst_element_add_pad". And after
that I keep a pointers to
>         alll such
>         > newly created srcpads.
>         >
>         Normally a demuxer will create dynamic pads,
based on the
>         contents of 
>         the stream, instead of the app requesting
pads.
> 
> demuxer is only creating dynamic pads but not based on
the contents of
> the stream, but they are requested  while linking the
elements .
> Basically,  This demux-elements provides n number of
elements a
> different output-streams, which means there could be
three elements
> connected to this demuxer srcpads. 
> 
> 
>         You also need to activate the pads (when
requested in
>         >=PAUSED) before
>         adding them to the element so that they can be
used for data
>         passing.
> 
> Which exactly state of transitions makes the srcpads on
element
> inactive ? 
> Do I have to make them active by
"gst_pad_activate_push(pad, TRUE)" ?
> 
Pads become active in the element READY->PAUSED state
change and
inactive again in PAUSED->READY. The FLUSHING flag is set
on the pad so
that any push/pull on the pad will return
GST_FLOW_WRONG_STATE.

gst_pad_set_active (pad, TRUE) is the function.

> 
>         >
>         >    gst_pad_push (srcpads[i], outbuf);
>         > }
>         
>         The return value of _push should tell you about
the reason for
>         the
>         failure. You also need to pass this return
value upstream
>         (possibly
>         combining the return values of all pads).
> 
> Yes, I using combined return. But this gst_pad_push
never returns
> after pushing, Infact the data is never pushed &
never received on the
> peer end. It just hangs. 

If that is the case then I think the dataflow is just
blocked in the
sink as the preroll buffer. Maybe you forget to add queues
after the
srcpads to give all sinks a chance to receive a buffer?

Wim

> 
> Thanks, 
> Vinayak 
> 
>
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> Using Tomcat but need to do more? Need to support web
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> Get stuff done quickly with pre-integrated technology
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> Download IBM WebSphere Application Server v.1.0.1 based
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> http://sel.as-us.falkag.net/
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> _______________________________________________
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er-devel


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services, security?
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make your job easier.
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Apache Geronimo
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sel?cmd=lnk&kid=120709&bid=263057&dat=121642

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