[vdr] [Fwd: QAM in vdr]

mlists mlists at dressler.ca
Thu Aug 17 17:33:42 CEST 2006


Clem sent me this email and asked me to share it with the list.  He was
able to get VDR working with ATSC.  Please see below.

Thx
Norm

-------- Forwarded Message --------
From: Herbert, Clem R. <<email addressed removed>>
To: mlists at dressler.ca
Subject: QAM in vdr
Date: Thu, 17 Aug 2006 10:21:54 -0500

Hi Norm,

 

I saw your post on the mailing list and I wanted to add to the info
Klaus found (in a post from me).  Sorry my old email is bad now, I
opened it to avoid spam and didn’t use it enough so it was deleted ☹
I’ll try and find the best way to rejoin the list.  BTW, I sent a copy
of this to Klaus.  It would be cool if you could repost this on the list
in the meantime, for the other readers.  Just please scramble my email
address so that the spam bots don’t find me ;)

 

Anyway,  I managed to view ATSC OTA (8vsb with antenna) and QAM 256 (usa
digital cable) here in Houston using that patch.  I'm using the Dvico
Fusion 5 Lite ATSC card.  I don’t know anything about dvb programming
(yet) so I can’t get guide info and such.  Also, I made simple script to
convert the azap output of dvb-apps/atscscan to convert the output to
current vdr format (vdr output switch in atscscan complains that vdr
won’t do ATSC).

 

 

************************************************** Cleaner ATSC patch
diff -Naur vanilla/channels.c atsc/channels.c

--- vanilla/channels.c  2006-03-16 21:48:57.285953250 -0600

+++ atsc/channels.c     2006-03-16 21:48:48.469402250 -0600

@@ -50,6 +50,7 @@

 

 const tChannelParameterMap ModulationValues[] = {

   {   0, QPSK },

+  {   8, VSB_8 },

   {  16, QAM_16 },

   {  32, QAM_32 },

   {  64, QAM_64 },

diff -Naur vanilla/dvbdevice.c atsc/dvbdevice.c

--- vanilla/dvbdevice.c 2006-03-16 21:48:57.289953500 -0600

+++ atsc/dvbdevice.c    2006-03-16 21:53:43.739855500 -0600

@@ -263,6 +263,19 @@

          lockTimeout = DVBC_LOCK_TIMEOUT;

          }

          break;

+    case FE_ATSC: { // ATSC

+

+     // Frequency and symbol rate:

+     

+     Frontend.frequency = FrequencyToHz(channel.Frequency());

+     Frontend.inversion = fe_spectral_inversion_t(channel.Inversion());

+     Frontend.u.vsb.modulation = fe_modulation_t(channel.Modulation());

+                 

+     tuneTimeout = DVBC_TUNE_TIMEOUT;

+     lockTimeout = DVBC_LOCK_TIMEOUT;

+     }

+     break;

+                                                                       

     case FE_OFDM: { // DVB-T

 

          // Frequency and OFDM paramaters:

@@ -753,6 +766,7 @@

   int type = Source & cSource::st_Mask;

   return type == cSource::stNone

       || type == cSource::stCable && frontendType == FE_QAM

+      || type == cSource::stCable && frontendType == FE_ATSC

       || type == cSource::stSat   && frontendType == FE_QPSK

       || type == cSource::stTerr  && frontendType == FE_OFDM;  }

 

 

************************************************** End ATSC patch

 

 

 

 

***************************** Convert QAM azap to vdr channels.conf 

 

#!/bin/bash cat $1 | awk -F: '{

 

print $1":"$2":M256:C:0:"$4":0;"$5":0:0:"$6":0:0:"$6

 

}'

 

************************************************************** End

 

 

 

***************************** Convert ATSC azap to vdr channels.conf 

 

#!/bin/bash cat $1 | awk -F: '{

 

print $1":"$2":M8:C:0:"$4":0;"$5":0:0:"$6":0:0:"$6

 

}'

 

************************************************************** End

 

 

 






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