[vdr] bitstreamout 0.70 and vdr 1.3.22

Dr. Werner Fink werner at suse.de
Mon Mar 14 18:53:14 CET 2005


On Mon, Mar 14, 2005 at 06:01:02PM +0100, Roland Praml wrote:
> >> I've figured out if I replay the file with vdr, the bso(replay) thread 
> >> doesn't start with newer recordings
> >
> > And you have choosen the AC3 audio track during replay the
> > recording with the green button?  I've this question because
> > this is the first report of that kind.
> 
> yes i've tested it several times.
> I've tracked down the problem a little bit. Data is sent to the plugin
> but the replay thread doesn't start because ScanPayOfPS1 fails.
> 
> I've commented out these two lines:
>         case 0x0b:
>         //  if ((uint_16)dvb != AC3magic)
>         //      break;
> and now it works. 

Hmmm ... this implies that the offset

          off_t   o  = (off_t) (ul & 0x0000ffff) + 3;

is not correct because the stream is moved forward

          dvb += o;

to the start of the  magic word of the frame which should
start there.  As this works with stuff from DVD trailers
I assume that something goes wrong elsewhere, e.g. in the
cDolbyRepacker class.

   [seeking VDR sources]

OK it _is_ a bug in the cDolbyRepacker class, therefore
I've added Reinhard to CC.

IMHO the declaration of AppendSubStreamID includes
an error:

  void cDolbyRepacker::AppendSubStreamID(void)
  {
    if (subStreamId) {
       pesHeader[pesHeaderLen++] = subStreamId;
       pesHeader[pesHeaderLen++] = 0x00;
       pesHeader[pesHeaderLen++] = 0x00;
       pesHeader[pesHeaderLen++] = 0x00;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The minimal size is 0x01 and never 0x00
       }
  }

... OK, in the firmware I've included a workaround for
such broken sub audio header.  Nevertheless this should
be corrected :^)  ... Reinhard?


           Werner

-- 
AC3 loop through sound card http://bitstreamout.sourceforge.net/
Howto http://www.vdr-portal.de/board/thread.php?threadid=1958
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