[gst-devel] messaging

[Tristan Matthews]

2010/3/24 Edward Hervey <bilboed at gmail.com>

> Hi,
>
> On Wed, 2010-03-24 at 11:05 +0100, Mattias Barthiel wrote:
> > Hi,
> >
> > I have just made use of the nice feature of the gst-bus to pass messages
> > from an element to the application.
> >
> > How do you message in the other direction? application->element?
>
>   The bus is only designed for message passing from element to upstream
> elements (and eventually application).
>
>
You can post your own application-specific messages on the bus:

http://www.gstreamer.net/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#gst-message-new-application

but unless you've written elements specifically for your application that
are expecting such messages, this is only really useful for passing messages
between different components in your app in a thread-safe way (assuming they
are in different threads).

 If you want to pass instructions to an element... Just use the
> property system by adding properties to your element and setting them
> (ex: g_object_set (myelement, "thisvariable", thisvalue, NULL)).
>

Adding properties is definitely more straightforward/cleaner than handling
application-specific messages.

Best,
Tristan


>

   Edward
>
> >
> >
> > Best regards,
> >
> > Mattias
> >
>
>
>
>
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-- 
Tristan Matthews
email: tristan at sat.qc.ca
web: http://tristanswork.blogspot.com
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