[vdr] Re: [PATCH] AC3overDVB 0.1.0

[s.huelswitt@gmx.de (Stefan Huelswitt)]

On 24 Jan 2003 "Reinhard Walter Buchner" <rw.buchner@freenet.de> wrote:

Hi,
there are some I need more information on...

> I applied your patch (VDR & DVD) to two versions:
[...]
> Vanilla VDR 1.1.21 with the new cii driver
> zcat auto patch

What is this "zcat auto" patch?
Please try with a real vanilla version...

> My results are the same in both cases, so both VDR version
> patches DO work, but:
> 
> - Live viewing of movies works fine in either DD or normal mode.

Which is very suprising, as my patch doesn't allows LiveAC3 yet
(except views via transfer mode).

Let mes ask just to be sure: your DD receiver is connected to the
digital out of the DVB card (not connected to a soundcard)? And
you're not using "-a" when calling vdr?

> When I try the above "can'ts" I get a noise similar to white
> noise except it's in a staccato mode. It seems to me that

The noise you're hear, is the raw digital AC3 data played as PCM
audio. This indicates that your DD receiver doesn't detected the
encapsulated data.

> your mods are trying to encapsulate audio even where they
> shouldn't be doing this.

Well, I can say one thing. The patch only encapsulates data from
the private stream, "normal" audio packets are not touched (to ge
exact, they are removed from the stream when a private stream is
available).

To be sure, if a stream contains DD data, you could make a small
modification. In multichannelaudio.c, locate:

        case 0xBD:    //private stream 1
        case 0xBF:    //private stream 2 ???
        {

           //DEBUG("Encapsulate: private stream offset=%d l=%d len=%d rest=%d\n",i,l,length,length-i);
           const int ptsdata = 9;            // start of PTSdata

Remove the // in front of DEBUG. This way you should get a
message on console every time a DD packet is detected and
encapsulated.

> Falling back on analog audio in the cases of not working doesn't
> help.

It's a feature. Analog audio out cannot be used together with
AC3overDVB.

-- 
Stefan Huelswitt
huels@iname.com  | http://home.pages.de/~nathan


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