[Bug 759470] input-selector: add mode that waits for keyframe before switching inputs

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759470

--- Comment #13 from Tapas Kumar Kundu <tapascst at gmail.com> ---
(In reply to Thiago Sousa Santos from comment #12)
> 
> If you switch the pad immediately you will stop pushing buffers on the old
> pad and downstream will receive no buffers until you get a keyframe, so yes.
> You get a stall just like it happens today. You need to current active pad
> to keep pushing buffers until the one you want to activate gets a keyframe.
> 
> 
> No, you will store some state that will mean that you are switching on the
> next keyframe and that will happen in the _chain() function once a non delta
> buffer arrives.
> 

I really appreicate your help on this. So I will set a flag whenever
set_active_pad is called. chain function will check for this flag and if the
flag is set then it will try to detect keyframe on to-be-activeted-pad . When
keyframe comes for to-be-activated-pad, chain function will signal
set_active_pad() function to actually set active pad. 

One question:
Are chain function and set_active_pad run by two different threads ?

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