Are all dvb drivers expected to report snr 0-65535? Mine seems to report 0-255.
I noticed that the snr for hvr-1600 (Name: "Samsung S5H1409 QAM/8VSB Frontend") is always 0 in the web-ui. The data that the web ui is getting from the backend is in the 220-240 range. Which matches what dvb snoop reports:
stephen@Dell-DM051:~$ dvbsnoop -s signal
dvbsnoop V1.4.50 -- http://dvbsnoop.sourceforge.net/
---------------------------------------------------------
Transponder/Frequency signal strength statistics...
---------------------------------------------------------
cycle: 1 d_time: 0.001 s Sig: 42130 SNR: 225 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 2 d_time: 0.005 s Sig: 42130 SNR: 225 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 3 d_time: 0.005 s Sig: 42130 SNR: 230 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 4 d_time: 0.004 s Sig: 43066 SNR: 230 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 5 d_time: 0.005 s Sig: 43066 SNR: 230 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 6 d_time: 0.005 s Sig: 42130 SNR: 225 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 7 d_time: 0.005 s Sig: 42130 SNR: 225 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 8 d_time: 0.004 s Sig: 42130 SNR: 225 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 9 d_time: 0.005 s Sig: 43066 SNR: 230 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
Those seem like pretty good snr values if interpreted as single bytes:
225/255*100=88%
230/255*100=90%
The web-ui code seems to expect a value between 0-65535
https://github.com/tvheadend/tvheadend/blob/1c65e8b0f03384a5ca5b5fc7635ecad4fd85b415/src/webui/static/app/status.js#L491
femon reports 0% for the same range, so perhaps it is a driver issue?
stephen@Dell-DM051:~$ femon
FE: Samsung S5H1409 QAM/8VSB Frontend (ATSC)
status SCVYL | signal a492 | snr 00e1 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status SCVYL | signal a83a | snr 00e6 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status SCVYL | signal a83a | snr 00e6 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status SCVYL | signal a83a | snr 00e6 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status SCVYL | signal a83a | snr 00e6 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
^C
stephen@Dell-DM051:~$ femon -H
FE: Samsung S5H1409 QAM/8VSB Frontend (ATSC)
status SCVYL | signal 61% | snr 0% | ber 0 | unc 0 | FE_HAS_LOCK
status SCVYL | signal 64% | snr 0% | ber 0 | unc 0 | FE_HAS_LOCK
status SCVYL | signal 65% | snr 0% | ber 0 | unc 0 | FE_HAS_LOCK
^C
