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ljalves / linux_media

TBS linux open source drivers
https://github.com/ljalves/linux_media/wiki
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TBS 6981 don't have "SNR" status in Tvheadend #105

Closed zinonino closed 8 years ago

zinonino commented 9 years ago

I use firmware from your WIKI: https://github.com/ljalves/linux_media/wiki/CX24117-firmware Debian 64 bit 8.1.0 with 3.16 kernel

snr

With original driver from TBS have "SNR" .

Andy-ABTec commented 9 years ago

Same problem here with the TBS6985 (though I must admit I hadn't noticed until I tried the TBS drivers during my ground-up rebuild on Ubuntu 14.04 64 bit)

nickb937 commented 9 years ago

There is a SNR result but it is between 0000 and 00ff rather than 0000 and ffff. The problem is that tvheadend doesn't scale up the range provided.

fenickb@satellite:~$ femon -a 3 FE: Tmax TAS2101 (DVBS) status SCVYL | signal ded8 | snr 0074 | ber 00000000 | unc 00000000 | FE_HAS_LOCK status SCVYL | signal e012 | snr 0074 | ber 00000000 | unc 00000000 | FE_HAS_LOCK

Andy-ABTec commented 9 years ago

Fair comment, however it doesn't explain why the standard TBS drivers can apparently provide the functionality with no change to my system other than swapping the drivers for my 6985.

Now I'm really confused...

zinonino commented 9 years ago

@nickb937 Here also have SNR in TVH with official driver of TBS. Are this is problem in TVH where can't get signal from V4L driver ? to know to search prob in TVH

Andy-ABTec commented 9 years ago

Unfortunately I'm away at the moment and don't have access to my tvheadend box (vpn is down for some reason).

I'll double check and take some screen grabs and report back when I have definite proof one way or the other...

Must admit I haven't come across femon before, I'll possibly have a play with that as well!

nickb937 commented 9 years ago

The TBS-provided drivers represented SNR in the range 0x0000 - 0xFFFF range; the TBS drivers here use 0x0000 - 0x00FF. There's no standard on the range: some other TV cards use 0x0000 - 0x00FF and some use 0x0000 - 0xFFFF.

trsqr commented 9 years ago

Ideally you want to implement DVBv5 statistics instead of the old DVBv3 in the driver as this problem is covered there...

ljalves commented 8 years ago

I upstreamed the tbs6981 (cx24117) driver, the SNR fix (DVBv5 stats) has to go to the official media_tree, then merged to here... I'll do it when I get the chance...