[pvrusb2] Signal Strength Value of HVR-1950 DVB Stream?

[Mike Isely]

On Tue, 2 Jun 2009, Roger wrote:

> Where is the signal strength value reported when playing a dtv stream
> from the HVR-1950?
> 
> While playing,
> $ mplayer dvb://KUAC-DT:533028615:8VSB:0:0:65534
> 
> This shows zero.
> $ cat /sys/class/pvrusb2/sn-6202710/ctl_signal_present/cur_val
> 0
> 
> Or is it reported in-kernel by V4L/DVB interface??
> 

When you are playing a dtv stream, the pvrusb2 driver has very very 
little control over what is going on.  This because the DVB 
infrastructure prefers to "own" the hardware while in dtv mode.  All the 
pvrusb2 driver does really here is pass through the mpeg data stream and 
otherwise stay out of the way of DVB.  So any kind of status info while 
in dtv mode really has to come from the DVB core not the pvrusb2 driver.  
Thus the sysfs interface and ALL of the V4L interface is effectively 
unusable once a DVB application has taken the reigns.  What 
ctl_signal_present only will tell you is the status when you are in 
television or radio mode not dtv mode.

This is not a situation I like very much but it's unfortunately what I 
am limited to with the DVB internal architecture as it currently stands.  
There are a few ideas being tossed around that might mitigate this, but 
at the moment they are just ideas (actually really only one idea).

  -Mike

-- 

Mike Isely
isely @ isely (dot) net
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