Fwd: Re: [Flac-dev] ogg-flac?

[Josh Coalson]

--- Matt Zimmerman <mdz at debian.org> wrote:
> Date: Mon, 26 Mar 2001 18:40:38 -0500
> From: Matt Zimmerman <mdz at debian.org>
> To: flac-dev at lists.sourceforge.net
> Subject: Re: [Flac-dev] ogg-flac?
> 
> On Mon, Mar 26, 2001 at 11:34:04AM -0800, Josh Coalson wrote:
> 
> > --- "smoerk at gmx.de" <smoerk at gmx.de> wrote:
> > > hi,
> > > 
> > > would it be possible to use ogg as container for flac? so you
> could use all
> > > the features of the ogg format.
> > >
> > A long time back I looked into that but couldn't find a detailed
> enough spec.
> > I plan on taking a look again when I get a chance.
> > 
> > Monty has plans to revive Squish but he's a busy guy and may not
> get around
> > to it for a while.  Also, almost all codecs I tested beat Squish
> '98 so the
> > bar is a little higher nowadays.
> > 
> > If FLAC fits into Ogg and the Ogg group is willing, I'm all for it.
> 
> I had been thinking about this as well, and from looking at the API,
> it seems
> that the ogg format doesn't care much at all about what it's
> streaming; it's
> treated as a sequence of random bytes, divided into pages.  The
> encoding
> process, as documented in libogg, is approximately:
> 
>   * Use the encoding engine to produce a raw packet of data.
>   * Call ogg_stream_packetin to submit a raw packet to the stream.
>   * Use ogg_stream_pageout to output a page, if enough data has been
> submitted.
>     Otherwise, continue submitting data.
> 
> The documentation is much improved.  However, if the existing FLAC
> format were
> encapsulated by Ogg, there would be a lot of duplicate data
> (specifically,
> framing, synchronization, error detection, etc.).  Ogg also has a
> facility for
> interleaving multiple channels, though I'm not sure whether FLAC
> operates on
> each channel individually (does it?).
> 
> Personally, I think separating the streaming aspect from compression
> is a great
> idea, and makes it easier to write clients supporting multiple
> compression
> codecs if they share the Ogg bitstream format.
> 
> -- 
>  - mdz


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