[linux-dvb] S2API - Status - Thu Sep 11th

Steven Toth stoth at linuxtv.org
Fri Sep 12 15:18:38 CEST 2008

Christophe Thommeret wrote:
> Le Friday 12 September 2008 07:51:17 Steven Toth, vous avez écrit :
>> Hello!
>> More progress today, 7 new patches were merged - all related to the
>> feedback and suggestions we had.... And a bugfix. :)
>> The DTV_SET/GET command syntax has been rationalised, as Hans requested.
>> This cleans up the application API nicely. Various internal improvements
>> and code cleanup related to variable length arrays, moving values
>> to/from userspace to the kernel. Interfacing to the demods to allow them
>> to interact with set/get property requests, if they chose to do so.
>> Quite a lot of changes internally and to the user facing API.
>> If you're planning to test then you'll need the tune-v0.0.5.c to see the
>> different. (steventoth.net/linux/s2/tune-v0.0.5.tgz)
>> In addition, some related news:
>> mkrufky spent some time adding S2API isdb-t support to the siano driver,
>> that's working pretty well - tuning via the S2API app.
>> Two tree here, offering slightly different approaches, one with S2API,
>> one using some spare bits in the DVB-T tuning fields.
>> http://linuxtv.org/hg/~mkrufky/sms1xxx-s2api-isdbt/
>> http://linuxtv.org/hg/~mkrufky/sms1xxx-isdbt-as-dvbt/
>> (See tune-v0.0.5.tgz for example ISDB-T tuning code)
>> If you're interested in seeing the impact of switching to S2API for this
>> driver, see the set_frontend() func, it's a small change - just a few
>> lines to reference the dtv_frontend_properties cache.
>> I don't think we're quite ready to announce we've conquered the complete
>> ISDB-T API, so don't assume that this is concrete.... As we experiment
>> with other ISDB-T products we'll probably find reasons to tweak the API
>> a little further as a standard begins to form..... but tuning through a
>> clean API is a great step forward, and its working now, today. Thank you
>> mkrufky :)
>> Hans Werner sent a large patch for the multifrontend HVR3000/HVR4000
>> combined DVB-T/DVB-S/S2 support for the S2API tree. (Thanks Hans - this
>> was obviously a lot of manual merge work, it's greatly appreciated.)
>> What would everyone like to see happen with this patch?
>> Would you prefer to see this dealt with outside of the S2API discussion,
>> or would you like to see this included and merged? Let me know your
>> thoughts. Andreas also has the multifrontend thread running, so comment
>> here if you would like to see this as part of the S2API patches, or
>> comment on the Andreas thread of you want this as a separate patchset at
>> a later date.
>> Darron Broad has offered to bring the cx24116.c driver up to date with
>> some additions he has in his repositories. With any luck we may see
>> these merged into the current cx24116 driver within a few days. Thank
>> you Darron.
>> Patrick, I haven't looked at your 1.7MHz bandwidth suggestion - I'm open
>> to ideas on how you think we should do this. Take a look at todays
>> linux/dvb/frontend.h and see if these updates help, or whether you need
>> more changes.
>> Igor has been busy patching the szap-s2 tool
>> (http://liplianindvb.sourceforge.net/hg/szap-s2/) so many thanks to
>> Igor! Gregoire has been running some basic tests and appears to be
>> having some success, that's encouraging. Thank you.
>> What's next?
>> Now's probably a good time to start patching dvb-apps. I think the
>> frontend.h changes are close enough for that work to begin. This will
>> probably start Friday, so keep your eyes and open for the
>> stoth/s2api-dvb-apps tree appearing ... and an announcement here.
>> Thanks again to everyone, your efforts are appreciated!
>> Regards,
>> Steve
> Good work.
> I've just gave it a try:
> First i tried old api (kaffeine)-> everything works as expected.
> Then i tried new API (with latest tune.c) -> nova-t and nova-s work, cinergyT2 
> doesn't. I've also noticed that FE_SET_PROPERTY ioctl always return -1, even 
> when success..
> Then i tried old api again -> now dvb-s doesn't lock and dvb-t always lock on 
> the freq used in tune.c

Christophe, thanks for the feedback. I'm not familiar with the cinergyT2 
driver so I'll look into this tonight and see what's causing the tuning 
to fail.

Thanks for highlighting this.



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