Thread: tune-s2, my little linux app

It is Technisat Skystar HD2
lspci shows:

Multimedia controller: Twinhan Technology Co. Ltd Mantis DTV PCI Bridge Controller [Ver 1.0] (rev 01)

(STB0899 Multistandard)

It works fine in dvb-s2 (for example no problem with scan-s2, some windows programs, etc), but i need a program which will only tune to selected transponder (dvb-s, dvb-s2) and then i can do some dvbsnoop analysys. (maybe You know any other program which will do the job ?). All programs i have found works only with dvb-s

are you using the stock v4l in the kernel or another v4l ? what kernel version ?

uname -a

I used stock kernel from debian test squeeze distro.
Now, i'm using debian lenny
2.6.26-2-686 #1 SMP Thu Aug 19 03:44:10 UTC 2010 i686 GNU/Linux

with s2-liplianin v4l drivers

and still same problem.


I managed to walk around that problem. I modified scan-s2 (this program tunes into dvb-s2 with no problem) to stop after every tunning and wait for a keypress (my C knowledge is crappy so i don't know how to execute dvbsnoop inside another program or anything else ;| ) - and in that time i can do dvbsnoop

Well, this is a bit off-topic, but I just picked up a Genpix SkyWalker-2 (basically the SkyWalker-1 without the chassis) and I'm trying to write some software of my own to control it. I've got DVB-S working (as well as DVB-S2 on my other tuner), but I can't seem to figure out how to get DCII to work.

For example, I want to tune in 3800V on AMC 18. LyngSat says (and my DSR-4000 confirms) that the symbol rate is 19510 ksps and the FEC coding is 3/4. So I run my FE_SET_PROPERTY ioctl to tune the card with these parameters:

DTV_DELIVERY_SYSTEM = SYS_DCII_C_QPSK
DTV_FREQUENCY = (5150000 - 3800000) == 1350000
DTV_MODULATION = QPSK
DTV_SYMBOL_RATE = 19510
DTV_INNER_FEC = FEC_3_4
DTV_INVERSION = INVERSION_AUTO
DTV_ROLLOFF = ROLLOFF_AUTO
DTV_PILOT = PILOT_AUTO

However, the card does not lock onto the transponder. It reports a signal level of 65535 and an SNR of 3955. I've tried all 4 possible DCII delsys variants to no avail.

So, question #1 is, what exactly should the parameters be set to in order to receive a DCII signal? Question #2 is, what are the values of the SYS_DCII_foo defines supposed to be? I just appended them to the fe_delivery_system table, yielding values of 16, 17, 18 and 19. I assume that the existing value of 4 for SYS_DSS is acceptable for that mode when/if I start messing with that.

I can post my patch later. I'll try tonight but it might be tommorow, busy day today

I anxiously await your patch.

Were any modifications needed to the driver itself, or just the DVB header?

here are the gp8psk patch's, and you'll also need to patch the v4l-dvb include/linux/dvb/frontend.h file so that the DGII systems are defined.

this will allow you to tune DGII in linux using my tune-s2 app, and from there you can use my demux app to save the stream to a file. vlc plays them fine.

UDL

Alright, we're in business! Listening to music on W5 as I type this.

I did make one change to your patch: I added a "SYS_" prefix to the defines for the DCII modes, for consistency with the other definitions.

glad it worked out well for you. Its sure nice to have DGII as an option in linux. Ive got DSS working as well for the lock, but havent had time to look into the DSS differences much. I know the packet size is smaller, but I beleive they also use different descriptors so its more then just chaning the packet size in the DMX.