How to detect dynamically loaded plugins in playbin based app ?

[rland]

Hi, I need to write a tool,  playbin2 based on of app real-time print automatically loaded element's info,such as name,rank,
obj addr,etc...
That is to say, when loading a plugin into bin immediately use  signals or events or message to notify app to print it.
If  do not modify the SDK's  code, there is a way to do it?

I read the gstbin.c  code, see there is a element-added signal,
when a element to join bin, will emit a element-added signal.

But only send to its parent bin, that is, will not be nested into a more upper bin.
For example, uridecodebin can receive an signal when decodebin2 is added , but will
 not receive element-added signal when a decoder(such as avdec_aac,avdec_h264...)
element plugged  in....

Any suggestion will be appreciated.

Thanks,
-chou

[Sebastian Dröge-3]

On Di, 2016-07-26 at 19:02 -0700, lucky chou wrote:

> Hi, I need to write a tool,  playbin2 based on of app real-time print
> automatically loaded element's info,such as name,rank,
> obj addr,etc...
> That is to say, when loading a plugin into bin immediately use  signals or
> events or message to notify app to print it.
> If  do not modify the SDK's  code, there is a way to do it?
>
> I read the gstbin.c  code, see there is a element-added signal, 
> when a element to join bin, will emit a element-added signal.
>
> But only send to its parent bin, that is, will not be nested into a more
> upper bin.
> For example, uridecodebin can receive an signal when decodebin2 is added ,
> but will
>  not receive element-added signal when a decoder(such as
> avdec_aac,avdec_h264...) 
> element plugged  in....

In GStreamer 1.9.1 and newer there's deep-element-added and deep-
element-removed, which will give you information about elements
added/removed somewhere deep inside playbin.

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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[rland]

That's wonderful! sebastian,thx for your information.

[Duncan Palmer-2]

That sounds really handy. I've previously registered element-added handlers on all new bins as they created by decodebin, in an attempt to work around the element-added limitations.

On 27 July 2016 at 16:43, lucky chou <[hidden email]> wrote:

That's wonderful! sebastian,thx for your information.



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