[Ffmpeg-devel] [PATCH] demuxer for dcinema audio

Michael Niedermayer michaelni
Wed Aug 31 13:10:29 CEST 2005


On Wed, Aug 31, 2005 at 09:54:19AM +0200, Reimar D?ffinger wrote:
> Hi,
> On Wed, Aug 31, 2005 at 03:33:13AM +0200, Michael Niedermayer wrote:
> > On Sat, Aug 27, 2005 at 05:08:38PM +0200, Reimar D?ffinger wrote:
> > > I'd like to suggest the attached patch for demuxing D-Cinema audio. It's
> > > not exactly beautiful since it does something like decoding (changing
> > > the bit order), but I though it to be the easier solution over adding a
> > > special decoder (since it isn't used anywhere else).
> > > The smil file that came with it said it was of the format "audio/302m",
> > > and I assume it is SMPTE 302M uncompressed audio, but I don't have the
> > > specs.
> > > Please tell me what you think about it...
> > 
> > uhm, well, messy ... too messy, and we have enough messy code aleady ...
> Hmm... what would be an acceptable solution? Just moving the 24bit weird
> audio -> "normal" 32bit audio conversion to libavcodec/pcm.c?
> I would then have to "invent" a new format ID for MPlayer though.
> Or which part of it is messy?

everything, you dont even know if its SMPTE 302M, its just a guess from
"302M" or did i miss something?
further note, the title of 302M is 
"Television- Mapping of AES3 Data into MPEG-2 Transport Stream"

so its supposed to be in a MPEG-TS, how can your proposed "convert it 
to 32bit" demuxer ever work with that?

also note, AES3 specs can be downloaded freely from 


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