[gst-devel] Plugin to listen to GstBus

[Stefan Kost]

Am 17.06.2010 21:04, schrieb Greg Wunder:
> Thanks for the insight.
> Does "should not" mean this is not possible with the current version of
> gstreamer?
> For video data fusion, I need to communicate forensic data acquired from
> one plug-in and pass it on to another.
> I was hoping to accomplish this through the GstBus.
> If this is not possible & I need to use a GstEvent, is there any
> functionality lost in using an event handler for this purpose?

If one element does feature extraction and the next element acts on it, you can
use a synchronized downstream event to pass the feature data as a GstStructure
to the next element (before pushing the buffer).
If you want to sent lots of data, as GstBuffer might be more appropriate as Mike
suggested.

Stefan

> 
> Greg
> 
> -----Original Message-----
> From: Michael Smith [mailto:msmith at xiph.org]
> Sent: Thu 6/17/2010 1:44 PM
> To: Discussion of the development of GStreamer
> Subject: Re: [gst-devel] Plugin to listen to GstBus
> 
> On Thu, Jun 17, 2010 at 10:26 AM, Greg Wunder <gwunder at eoir.com> wrote:
>> Is there an example of a plug-in to listen to messages on the GstBus?
>> I'm having trouble finding an example & would like to receive messages
> from
>> other plugins in a given pipeline.
> 
> There aren't any examples of that, since an element should not listen
> to bus messages from other elements.
> 
> Generally events (including custom events) are the appropriate way for
> elements to communicate specific additional information amongst
> themselves.
> 
> Mike
> 
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