[mythtv-commits] Re: Ticket #616: Wrong SNR/SIG values for some DVB cards

[MythTV]

#616: Wrong SNR/SIG values for some DVB cards
------------------------+---------------------------------------------------
 Reporter:  Adam Egger  |        Owner:  danielk
     Type:  defect      |       Status:  closed 
 Priority:  minor       |    Milestone:  0.20   
Component:  mythtv      |      Version:  head   
 Severity:  medium      |   Resolution:  invalid
------------------------+---------------------------------------------------
Comment (by Adam Egger):

 The b2c2_flexcop_pci aka skystar2 provides now quite correct values with
 kernel 2.6.14 instead of 49% for all channels until 2.6.13.
 It unfortunately uses uint32_t instead of int16_t, what means: 0 = 0% and
 FFFF = 100%.

 I found Taylor's answer to this in -dev:
 http://mythtv.org/pipermail/mythtv-dev/2005-June/036980.html
 So we just have to hope they all will use int16_t as SIG and SNR for all
 DVB drivers.

 "Each DVB driver does it differently.  There are no units because on many
 demods
 that have been reverse engineered no one knows what the units really are.

 Here is one example.  The value can be 0-0xFFFF.  I did some checking and
 found
 that 32DB is very very high for ATSC reception and so I made the SNR value
 for
 the Nxt2002 go from 0 (0db) - 0xFFFF (32db).

 The Hd2k/3k cards report the value as just the actual unit so 32db would
 be
 0x0020.

 Great system right?   There really isn't much of a way to fix this other
 than
 hope the drivers return some reasonable value.."

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/616>
MythTV <http://www.mythtv.org/>
MythTV