[NUT-devel] Another suggestion for broadcast [PATCH]

[Michael Niedermayer]

On Wed, Feb 20, 2008 at 03:25:37PM -0000, Måns Rullgård wrote:
> 
> Michael Niedermayer wrote:
> > On Wed, Feb 20, 2008 at 09:32:48AM +0000, Måns Rullgård wrote:
> >> Rich Felker <dalias at aerifal.cx> writes:
> >>
> >> > On Wed, Feb 20, 2008 at 01:32:14AM +0000, Måns Rullgård wrote:
> >> >> Another possibility is to precede each optional field with a 1-bit
> >> >> flag indicating its presence.  The size of the containing element can
> >> >> then also implicitly exclude any unused fields at the end.  This may
> >> >> of course not be desired for frequently repeated elements where the
> >> >> flags could be specified in a global header.
> >> >
> >> > I hope you understand, a 1bit field means a 1byte field. NUT has no
> >> > support for sub-byte data units except when they're appropriately
> >> > padded with reserved bits.
> >>
> >> Sounds like a deficiency.
> >
> > In what respect? That is what would we gain with droping byte alignment?
> > I think we would gain a lot of complexity primarely ;)
> 
> I thought Nut was supposed to have minimal overhead.  Requiring a syntax
> element to use 8 bits, even if it doesn't need them is not minimal.

True, but it simplifies things alot. Especially with byte aligned frame data.

Also about overhead nut can for example store VBR mp3 with single byte frame
headers, and at the same time removing 4 bytes from the mp3 frames, thats 
-3 bytes overhead. (We dont have an implemetation capable of muxing this yet
though)

This actually might make it advantaneous to store mp3 in nut instead of raw
mp3, and even more so as one could accurately seek in the nut file.



> 
> If you're willing to sacrifice a few bits for reduced complexity, that's
> fine.  I merely had the, apparently incorrect, impression that Nut was
> trying very hard to remove any unnecessary overhead, 

> even in the text
> of the format specification ;-)

Yes, theres no sense in saying something more than once :)

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope
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