[linux-audio-user] Re: [linux-audio-dev] [ANN] netjack-0.9rc1

[torbenh at gmx.de]

On Tue, Mar 14, 2006 at 12:21:40AM +0100, fons adriaensen wrote:
> On Mon, Mar 13, 2006 at 11:59:15PM +0100, stefan kersten wrote:
> 
> > as paul stated, network byte order is defined to be
> > big-endian, so yes, you have to convert 32 bit floats (and
> > doubles, for that matter) on intel, because they are stored
> > lsb first. of course it would be perfectly valid for netjack
> > to use little endian `on the wire'; but this would be like
> > putting my powerbook in little endian mode when playing a
> > wav file. sort of.
> 
> OK, but for floats the situation could be more complex. On Intel,
> the exponent/sign byte is the last one. Is it always the first
> one on BE platforms ? If it isn't then using ntohl() or htonl()
> wich are designed to work on 32-bit ints will not help. 

the current netjack code for converting the floats is tested.
it works. at least for PPC <-> intel

i only added the packet header after that test, and robert did not yet
test it again. 

> 
> For doubles, things are even more fuzzy. Can you just use ntohl()
> and htonl() on both halves, or do these two have to be swapped as
> well ? Will either rule produce consistent results on all
> platforms ?

i am happy, that i dont need to transfer doubles :)


-- 
torben Hohn
http://galan.sourceforge.net -- The graphical Audio language