[pvrusb2] pvrusb2-mci-20070114 radio support - stereo?

[Pantelis]

Στις Σάββατο 27 Ιανουάριος 2007 08:21, ο/η Mike Isely έγραψε:
> On Fri, 26 Jan 2007, Rick Macdonald wrote:
> > Mike Isely wrote:
> > >> In light of this, what is the next step?

I think I can now reproduce your problem without any doubt and even with a 
single earpiece.

The trick is to use mplayer's "pan" audio filter to subtract one channel from 
the other. The good thing about this method is that it is largely independent
of audio equipment, what the radio is actually playing and even ones hearing
ability (i.e., you don 't need to have a super ear to evaluate the result).

The procedure:
1) Use a configuration (windows or the 2.6.15 kernel that you know works)
and tune to a station that broadcasts stereo. To see if stereo is autodetected
in linux you should
cat /sys/class/pvrusb2/sn-*/ctl_audio_modes_present/cur_val
it should say: Stereo

In windows, the "stereo" red sign will light up. Find some stereo and some
mono stations.


2) From linux, tune to one of the stereo stations and play the stream with
mplayer like this:

mplayer -vo null -ao alsa -af pan=2:1:1:1:1 /dev/radio0





> >
> > If we've narrowed it down to those modules, does it now make sense that
> > the PVR-150 works but not the PVR-USB2?
>
> Well one possible explanation is that there's something different that
> ivtv is doing to its modules that pvrusb2 is not doing.  Another
> explanation is that the PVR-150 hardware is different - there could be a
> different tuner module there, it might be using a cx25840 instead of the
> msp3400+saa7115 combo on your PVR-USB2 device. 

PVR-150 is a cx25840 device AFAIK. This could explain the difference if
msp3400 (the one you have) has anything to do with the problem.