[linux-dvb] VDR suggestion - record to TS?

[Jörg-Oliver Todamm <jtodamm@itc-consult.de>]

Hi,
 
> I understand that this thread is about using the DVB hardware 
> to *output*
> the AC3 signal in a form useful for, e.g., an AC3 decoder.

You are right. I just found this:
"IEC60958 (The S/PDIF) can carry normal audio and IEC61937 datastreams.
IEC61937 datastreams can contain multichannel sound like MPEG2, AC3 or
DTS. When IEC61937 datastrams are transferred, the bits which normally
carry audio samples are replaced with the databits from the datastream
and the headers of the S/PDIF signal. Channel-status information
contains one bit (but 1) which tells if the data in S/PDIF frame is
digital audio or some other data (DTS, AC3, MPEG audio etc.). This bit
will tell normal digital audio equipments that they don't try to play
back this data as they were audio samples. (would sound really horrible
if this happens for some reason). 
The equipments which can handle both normal audio and IEC61937 just look
at those header bits to determine what to do with the received data. 
(Source: http://www.epanorama.net/documents/audio/spdif.html)"

So if it is possible to send uncompressed audio to a DVB device and than
to the SPDIF, it should also be possible to accept AC3 from an other
device that is used for such data streams. The implementation sounds
really simple and I would try it if I knew how to tweak the DVB driver
code to test this one.

So long,

J.-O. Todamm


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