[mythtv-users] More ATSC woes - Doug README - somestationsnow notbeingreceived at all

john roberts homepagez at lycos.com
Wed Jan 5 19:16:33 EST 2005


Right - mythfilldatabase is filling in info for 22_1 which I believe is incorrect.  Cap2It does have 1 thru 6 defined so this is where the data is coming from.

I'll try the new patch tonight.

-John

----- Original Message -----
From: "Doug Larrick" <doug at ties.org>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Subject: Re: [mythtv-users] More ATSC woes - Doug README - somestationsnownotbeingreceived at all
Date: Wed, 05 Jan 2005 18:27:25 -0500

> 
> john roberts wrote:
> > Well - not good news to report.  When something was marked to be
> > recorded - the backend is freaking out and looping.  This is with the
> > patch applied:
> [snip]
> > 2005-01-05 17:24:59.384 TuneTo(42-1) curList[i].freq(639250)
> [snip]
> > 2005-01-05 17:25:00.808 VCT Terra
> > 2005-01-05 17:25:00.808 Channel #0 name(MPT-DT) 22-2 cTSID(0x575)
> >  pnum(2) ETM_loc(1) access_ctrl(0) hidden(0) hide_guide(1) service_type(2) 
> > source_id(1)
> >  descriptors length(23) count(1)
> >      Service Location Descriptor (0xa1) length(21)
> >
> > 2005-01-05 17:25:00.808 Channel #1 name(MPT-HD) 22-6 cTSID(0x575)
> >  pnum(6) ETM_loc(1) access_ctrl(0) hidden(0) hide_guide(1) service_type(2) 
> > source_id(2)
> >  descriptors length(17) count(1)
> >      Service Location Descriptor (0xa1) length(15)
> 
>  From this, it appears your MPT station has channels 22-2 and 22-6! We're 
> trying to change to 22-1.  I'd call this a misconfiguration on their part, 
> but we should probably be picking a default in this case. In the meantime, if 
> you edit your freqid field to be 42-2 or 42-6, does it work?  Of course, this 
> will probably be reset by your next mythfilldatabase run.
> 
> Also, does the attached patch work any better?  It contains the old patch as 
> well, so you can skip the atsctables.h part of the patch.  If this doesn't do 
> anything either, a 50MB capture from this channel would be helpful.
> 
> -Doug

>
> 
> Index: libs/libmythtv/mpeg/atsctables.h
> ===================================================================
> RCS file: /var/lib/mythcvs/mythtv/libs/libmythtv/mpeg/atsctables.h,v
> retrieving revision 1.1
> diff -u -r1.1 atsctables.h
> --- libs/libmythtv/mpeg/atsctables.h	8 Dec 2004 02:04:08 -0000	1.1
> +++ libs/libmythtv/mpeg/atsctables.h	5 Jan 2005 23:23:43 -0000
> @@ -154,7 +154,10 @@
>           QString str;
>           const unsigned short* ustr =
>               reinterpret_cast<const unsigned short*>(_ptrs[i]);
> -        for (int j=0; j<7; j++) str.append(QChar((ustr[j]<<8) | 
> (ustr[j]>>8)));
> +        for (int j=0; j<7; j++) {
> +            QChar c((ustr[j]<<8) | (ustr[j]>>8));
> +            if (c != QChar('\0')) str.append(c);
> +        }
>           return str;
>       }
>       //   reserved               4  14.0        0xf
> Index: libs/libmythtv/mpeg/atscstreamdata.cpp
> ===================================================================
> RCS file: /var/lib/mythcvs/mythtv/libs/libmythtv/mpeg/atscstreamdata.cpp,v
> retrieving revision 1.2
> diff -u -r1.2 atscstreamdata.cpp
> --- libs/libmythtv/mpeg/atscstreamdata.cpp	24 Dec 2004 23:24:07 -0000	1.2
> +++ libs/libmythtv/mpeg/atscstreamdata.cpp	5 Jan 2005 23:23:43 -0000
> @@ -120,6 +120,11 @@
>               VERBOSE(VB_RECORD, QString("VCT Terra"));
>               TerrestrialVirtualChannelTable vct(*psip);
>               SetVersionTVCT(vct.TransportStreamID(), version);
> +            if (vct.ChannelCount() < 1) {
> +                VERBOSE(VB_IMPORTANT, "TVCT: table has no channels");
> +                HT_RETURN;
> +            }
> +            bool found = false;
>               for (uint i=0; i<vct.ChannelCount(); i++) {
>                   VERBOSE(VB_RECORD, vct.toString(i));
>                   if (vct.MinorChannel(i)==(uint)DesiredSubchannel()) {
> @@ -133,9 +138,17 @@
>                           // Do a (partial?) reset here if old desired
>                           // program is not 0?
>                           setDesiredProgram(vct.ProgramNumber(i));
> +                        found = true;
>                       }
>                   }
>               }
> +            if (!found) {
> +                VERBOSE(VB_IMPORTANT,
> +                        QString("Desired subchannel %1 not found;"
> +                                " using %2 instead")
> +                        .arg(DesiredSubchannel()).arg(vct.MinorChannel(0)));
> +                setDesiredProgram(vct.ProgramNumber(0));
> +            }
>           }
>           break;
>           case 0xC9: VERBOSE(VB_RECORD, QString("VCT Cable"));    break;
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