[mythtv-commits] Ticket #13052: MythTV assumes demux1 when frontend1 is in use, but no demux1 device is available only demux0

[MythTV]

#13052: MythTV assumes demux1 when frontend1 is in use, but no demux1 device is
available only demux0
--------------------------------------+-----------------------------
 Reporter:  Matt <maff667@…>          |          Owner:  (none)
     Type:  Bug Report - General      |         Status:  new
 Priority:  minor                     |      Milestone:  unknown
Component:  MythTV - Channel Scanner  |        Version:  Unspecified
 Severity:  low                       |     Resolution:
 Keywords:  demux1,demux0,scan        |  Ticket locked:  0
--------------------------------------+-----------------------------

Comment (by Mike Bibbings):

 This behaviour stems from a very old trac ticket (2009)
 ​https://code.mythtv.org/trac/ticket/5061 which mentions HVR3000 and
 HVR4000 cards. Prior to this change demux0 was always used.

 Today there are many devices which have two frontends per adapter but only
 1 demux/dvr, demux0, dvr0. Only one of the frontends can be used at anyone
 time with this demux/dvr.

 For example TBS 6522 has two frontends for each adapter, frontend 0 is
 DVB-T/T2 demux0, frontend 1 is DVB-S/S2, demux0.

 Whilst it is possible to "hack" by sym linking demux0 to demux1, this is
 not very user friendly.

 A change in cardutil.cpp CardUtil::GetDeviceName is required. To maintain
 existing behaviour, test to see if demux<n> exists where <n> is the
 frontend number, if the test fails return demux0. Similarly for dvr<n>.

 Attached is a patch, tested against current master (but can be backported
 to mythtv 29 and 30 if needed).

 Test system Xubuntu 18.04 with TBS 6522 PCI-e Dual DVB-S/S2,DVB-T/2 and
 Astrometa USB DVB/T/T2 tuners.

 Patch also applied to my production system, which has Hauppauge QuadHD
 DVB-T/T2 and TBS-6981 Dual DVB-S/S2 tuner, with no ill effects.

 Mike

-- 
Ticket URL: <https://code.mythtv.org/trac/ticket/13052#comment:1>
MythTV <http://www.mythtv.org>
MythTV Media Center