[vdr] BUG: DVB-T and DVB-S[2] do not work with VDR & multiproto

Reinhard Nissl rnissl at gmx.de
Sun Jan 13 00:26:53 CET 2008


Hi,

Stefan Lucke schrieb:

>>> Same here.
>>> Which DVB-T device do you use ? I'm using a cinergyT2.
>>>
>>> Ioctl's for this device are not passed
>>> via the common frontend interface. The new "API" has to get
>>> integrated into the cinergyT2 driver or client programs like vdr etc.
>>> have to recognize the driver supported API ;-) .
>>
>> I am using two Hauppauge Nova-T (tda1004x and cx2388x).
>>
>> Manu said in an earlier thread that there should be compatibility with
>> the old API so he doesn't think that should be a problem. The driver
>> in the multiproto tree for my devices have not been changed so should
>> work through the compatibility layer.
>>
>> The odd thing is that when I use an older pre-compiled VDR 1.4.x with
>> the new multiproto drivers everything works fine but when I compile
>> 1.5.12 with multiproto includes it doesn't work.

I spent the whole evening with Manu looking through the emulation
layer and cannot see any obvious errors in the DVB-T case.

It looks like there is still an error in the translation from the
multiproto SET_PARAMS ioctl to the old SET_FRONTEND. Manu was so
kind and created the attached patch, which prints the original
values given to SET_PARAMS in the DVB-T case and the translated
values which tda1004x' set_frontend() implementation receives.

Morfsta: as you have such a card and reported that VDR-1.4.x
tunes to DVB-T using the multiproto drivers (but old API) I ask
you to test this patch.

Make sure that VDR only uses the device with the tda1004x on it
by adding a suitable -Dx argument to VDR's command line.

To activate the logging messages, load the module dvb_core with
parameter dvb_frontend_debug=1 and the module tda1004x with
parameter debug=1.

Then use VDR-1.4.x (limited to only one device) and tune to a
certain DVB-T channel. Have a look what the driver reports (see
dmesg or /var/log/messages or anything else which suits your
system) at least for the set_frontend() function.

Next use VDR-1.5.12-dvbs2-... (limited to only one device) and
tune to the same DVB-T channel. Check what the driver reports
this time. Additionally to the set_frontend() output there must a
similar output before it which shows the parameters which VDR
passed to the emulation layer.

Please report the debug output here for further investigation.

> So I guess in your case, there is still an issue with the compatibility
> layer of http://jusst.de/hg/multiproto/ .
> 
> In my case I managed to get my cinergyT2 work with Reinhard's
> modified vdr, with attached diff.

Hmm, looks like you provide your own emulation layer :-(

Anyway, Manu agrees with me that it is not a good idea to have
multiple implementations of an emulation layer with the expense
of fixing the same bugs in every single driver.

Only when a device requires to use the new API (e. g. to report
DELSYS_DVBS2), the driver should be ported to the new API and
typically it should drop support for the old API at the same
time, too.

So, please revert your change and apply the attached patch. Copy
the debug output code from the tda1004x to your driver's file and
take part in the test.

Thanks in advance.

Bye.
-- 
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl at gmx.de
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