[gst-devel] plugin working with realimentation

[Antonio Marqués]

Sorry, what I meant is that I want to have as an input of a plugin the
output of other plugin that comes after this one. It is a kind of
feedback.

The first plugin delivers a buffer, which is processed by another
filter. The buffer pushed by this filter would be also pushed to the
previous plugin. I have tried to do so in Gstreamer and it did not work
at all. I had this output:


0:00:02.508437079 28071       0x6060b0 WARN                   bin
gstbin.c:1747:gst_bin_sort_iterator_next:<pipeline0> loop dected in
graph

(gst-launch-0.10:28071): GStreamer-WARNING **: loop detected in the
graph of bin pipeline0!!

I would like to know if there is a way in implementing this feedback
from a downstream element to an upstream element.

Sorry and thanks in advanced
On Thu, 2009-01-15 at 13:03 +0100, Stefan Kost wrote:
> hi,
> Antonio Marqués schrieb:
> > Hello developers,
> >
> > I am interesting to design a plugin which has as inputs N-1 number of
> > pads (some images from a filesrc for example) and another input which
> > would be the result of the plugin's output, so I would like to implement
> > a kind of realimentation in that plugin.
> >   
> honestly, I did not understood what you want to do. Also
> "realimentation" seem to be a strange word (seems to be a medical term).
> If you want to have a history of the last N buffers you need to
> implement a ringbuffer that would keep a reference of them.
> 
> Stefan
> > In that plugin I would like to have all the N input buffers in the
> > process function. So I have thought in using the collect pad method for
> > all the pads. The problem is that, for the first buffer I would have not
> > the buffer of the pad N (because it would be the output of the buffer),
> > so the pipeline would not be set on PLAYING state never. Does anyone
> > know how to solve this problem? The main purpose of the plugin is, to
> > make an initial computation for the first frame taking into account the
> > N-1 images and for the other frames taking also into account the
> > previous output, which would be the N pad.
> >
> > If anyone knows a plugin with similar function it would be great for me
> > to look at its source code.
> >
> > Thanks in advance.
> >
> >   
> 
> 
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-- 
Toni Marqués Marqués
Telefónica I+D
División de Tecnologías de Video
amm at tid.es
933653188