Vorbis dev - Oct 2001 - OggMux, a simple ogg file multiplexer

Hello,

I have in the past few days played a bit with libogg. My goal is to learn
enough of it to try wrapping current tarkin codecs into an ogg file, with
vorbis sound eventually. 
I did work on a small program which allows you to easyly (de)multiplex
Ogg files in a way which seems to conform to the docs. You can do things
like:

oggmux in1.ogg in2.ogg in3.ogg - mux3.ogg
oggmux mux3.ogg - /dev/null out1.ogg /dev/null
ogg123 out1.ogg

and hear sound that was in in2.ogg .

However i didn't found any player which would accept a multiplexed file,
maybe the bug is in my code ..
I'll investigate this trying to patch decoder_example.c to support mux
files.

You can find the code and README at 
http://code.infolibre.org/oggmux/archive/oggmux-0.1.0.tar.gz .

btw, my name is Olivier Barbut, live in Paris, france, I'm 21 and I do
follow this list since about a year and tarkin-dev too, pleased to meet you ;)


--
Olivier Barbut
SCOP InfoLibre

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> I have in the past few days played a bit with libogg. My goal is to learn
> enough of it to try wrapping current tarkin codecs into an ogg file, with
> vorbis sound eventually. 
> I did work on a small program which allows you to easyly (de)multiplex
> Ogg files in a way which seems to conform to the docs. You can do things
> like:
Did you even look at the stuff in the ogg-tools module?  Check out
ogg-tools/oggmerge

There's already a framework for you to add new types there. 

We dont' currently have a demuxer, so that maybe something you can share
:)

jack.

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On Wednesday, October 31, 2001, at 12:06 , olivier@infolibre.org wrote:
> However i didn't found any player which would accept a multiplexed
file,
> maybe the bug is in my code ..
> I'll investigate this trying to patch decoder_example.c to support mux 
> files.
That would be cool. Or better yet patch libvorbisfile. :)

Not playing multiplexed streams is a know bug with all current 
implementations (except the code in ogg-tools) and the fix is on the 
'required' list for rc3.

Later, olivier wrote:
> btw, I've seen you're in Holger's w3d BUGS file asked about
ogg-wrapping
> the current codec. I'm currently investing ways to do that, so
let's
> port
> this discussion to tarkin-dev ?
Absolutely!

Welcome,
  -r

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Hey all...is there a place I go for the proposed standard on what the 
comments will look like in a vorbis file? I know artist, track and all 
that are standardized (at least by ogginfo) but what about things like 
CDDB_ID or GENRE (yeah I know nobody uses it) or ENCODE_DATE (if anybody 
else uses it).

I'm really interested in trying to encode my ogg files so that any 
utilities I use will be compatable with the tags.

I do realize that one of the standards is to have no standard and keep 
it open but it certainly helps to use a more standard tag so that you 
can play an ogg file on something like xmms and winamp and all the 
proper values for the file show up in both players. Plus it allows for 
much easier input into a database automatically if most things are 
standardized.

Thanks for any input,
Chris

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On Wed, Oct 31, 2001 at 12:40:57PM -0800, rillian wrote:
> On Wednesday, October 31, 2001, at 12:06 , olivier@infolibre.org wrote:
> >I'll investigate this trying to patch decoder_example.c to support
mux
> >files.
> 
> That would be cool. Or better yet patch libvorbisfile. :)
Well today was a free day here and I spent some time looking at it ;)

The patch attached does "allmost" allow libvorbisfile to play the
first
stream in an interlaced ogg files, if vorbis, while keeping current 
seeking and chained-only multiplexing features, at least using ogg123
and xmms plugin.

It has one major bug: if the playing logical stream is part of an 
interlaced file the pcmlenght is garbage, and can have unexpexted
results (still better than now). A quick way to fix it would be to
disable pcmlenght/seeking if such a file is detected.

It is an ugly hack, because it does works by hiding data in
_get_next_page() in some unwanted case.

Olivier


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