[gst-devel] problem while pushing data to multiple srcpads.

Wim Taymans wim at fluendo.com
Fri Feb 2 11:48:00 CET 2007

On Fri, 2007-02-02 at 15:12 +0530, Vinayak wrote:
> On 2/2/07, Wim Taymans <wim at fluendo.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?


> Thanks, 
> Vinayak 
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