[vlc-devel] Accessing the demux Control at the interface level ? (re: RTSP trickplay)

[Glen Gray]

Hey Guys,

As part of an IRC discussion on how to make my RTSP Trickplay patches 
integrate better, I suggested that one option would be for the interface 
to query the Demux Control function with HAS_TRICKPLAY parameter. If it 
does, the the FastForward/Rewind controls in that interface can set the 
scaling values accordingly.

I do something like the above at the moment but my patch relies on a 
preference being set to enable RTSP scaled trickplay. If that option is 
set then I set the rate value accordingly at the interface level. This 
in turn triggers the INPUT_SET_RATE callback code in src/input/input.c. 
 From there, I can query the demux to ensure it has trickplay support, 
if so then I call demux2_Control(DEMUX_SET_SCALE.....) otherwise normal 
SET_RATE code proceeds.

It was expressed that it would be desirable to do away with the 
preference option. So my suggestion seems like a good solution, 
unfortunately, I can't see how I can "cleanly" make it work. I'm pretty 
busy working on something else at the moment, but wanted to get back to 
it shortly. So I'm looking for some suggestions from more experienced 
VLC developers on what's the best approach to take here.

Cheers,

-- 
Glen Gray (slaine at slaine.org)