[gst-devel] Dynamically adding and removing branches of a tee...

[Håvard Graff]

The problem with Wim's solution is that you are dependant of getting another buffer on the tee srcpad after you block it. If this is no problem, then his solution is the easiest one. If there is a chance no more buffers will arrive on the src-pad you can do:

1. Attach an event-probe to the tee srcpad you want to unlink.
2. Send a custom downstream serialized event on the tee sinkpad
3. Inside the callback of the event-prove, confirm the arrival of your custom event and:
	a) Unlink the branch from the tee srcpad
	b) remove the probe
	c) release the tee srcpad (note that this is actually safe to do inside the callback!)
	d) return FALSE (so you don't pass that event downstream)


Håvard


-----Original Message-----
From: Wim Taymans [mailto:wim.taymans at gmail.com] 
Sent: 27. august 2009 12:59
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] Dynamically adding and removing branches of a tee...

On Thu, 2009-08-27 at 03:42 -0700, karma wrote:
> Hi,
> 
> Then how to REMOVE elements from a tee dynamically? 
> e.g. how to remove recording_branch from tee dynamically?

Try in this order:

pad block the tee srcpad
in the pad block, wake up the main thread to perform this:
unlink the tee srcpad
Set the elements after the srcpad to READY/NULL
release the tee srcpad
unblock tee srcpad

Wim


> 
> Thanks a lot
> 
> sincerely, karma
> 
> 
> joh-4 wrote:
> > 
> > Try below:
> > 
> > gst_element_set_state( recording_branch, GST_STATE_PAUSED );
> > gst_bin_add( GST_BIN(pipeline), recording_branch );
> > gst_element_link( tee, recording_branch );
> > gst_element_set_state( recording_branch, GST_STATE_PLAYING );
> > 
> > You may also want to move the first line to before and after element link
> > line.
> > 
> > Justin
> > 
> > 
> > 
> > On Mon, Jul 20, 2009 at 5:02 AM, machinegodzilla
> > <machinegodzilla at gmail.com>wrote:
> > 
> >>
> >> Hi,
> >>
> >> Is it possible to add or remove elements to/from a tee dynamically?
> >>
> >> My pipeline looks like that:
> >>
> >>                 /  [ queue | decodebin | autovideosink ]
> >> (playing_branch)
> >> filesrc | tee
> >>                 \  [ queue | filesink ]
> >> (recording_branch)
> >>
> >> When I start the pipeline only the playing_branch is connected. After a
> >> while I connect the recording_branch in the following way:
> >>
> >> gst_bin_add( GST_BIN(pipeline), recording_branch );
> >> gst_element_link( tee, recording_branch );
> >> gst_element_set_state( recording_branch, GST_STATE_PLAYING );
> >>
> >> This, however, results only in a 0 bytes file being created and nothing
> >> else.
> >>
> >> Is there anything missing here, or is this approach wrong?
> >> --
> >> View this message in context:
> >> http://www.nabble.com/Dynamically-adding-and-removing-branches-of-a-tee...-tp24568543p24568543.html
> >> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> >>
> >>
> >>
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> 


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