[gst-devel] gtk and threads

[alberto colombo]

Tim, 

thank you for your reply


> With GStreamer-0.10, the easiest way to marshal information into the
> main thread is by using the pipeline's GstBus. This is the standard
> mechanism for plugins to send information (like errors or tags) to the
> application in a thread-safe manner. Your element can post custom
> messages with arbitrary data (via the message's GstStructure) on the bus
> and your application can then catch that custom message in its bus watch
> callback. Since you will already have a bus watch to catch errors, tags
> and to recognise the end of the stream, adding support for your custom
> message should be fairly easy. 

As it's often the case, the right solution is the simplest one, and the
last one I think of :-) Done, it works, and it it THE ONE WAY of doing
it!

> Btw, for your specific case (showing the current processing position) it
> might be sufficient to just set up a timeout with g_timeout_add() and
> query the pipeline for the current position in TIME format (if you're
> lucky DEFAULT format will work too and give you the frame number).

I am not lucky :-( and I don't like to rely on luck... anyway, this
specific case was just to solve the gst<->gtk communication problem in
general, not really for counting frames. My plugin will evolve in
something more elaborate, and may have something high level to tell the
GUI.

Thanks a lot
alberto

> 
> Hope this helps.
> 
>  Cheers
>   -Tim
> 
> 
> 
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