Re: Fwd: Protocol documentation updated

On Thu, Jan 23, 2003 at 11:16:33PM +0000, Pete Bentley wrote:
> Apologies if this appears twice, but I sent it Monday evening when the
> list stalled and it never arrived back, so I'm assuming it got 
> dropped...

If you could just do real bounces instead quoted forwards :)
 
> >>* There is a new function that equals the ">>" and "<<" button on the
> >>  player (see "Search Audio Track", A.3.1.10).
> >
> >Interesting... Wonder why they added that command, it seems kind
> >of redundant.

It's probably quicker/more responsive because you don't have to poll the
current playback position to calculate the track number.  It's certainly
more convenient for us, and was probably easy to wrap in the device
firmware, as it directly maps to the control buttons.

> >>* I have analyzed how you can do several calls to get very long disc 
> >>titles
> >>  (see "Get Disc Title", A.3.2.1).
> >
> >Very interesting... Any idea how to write long titles?

Yes, will be in the next version.  Here's the teaser:

<00 18 08> 0 18 18 01 03 00

<00 18 07> <02: 20 18 01 00 $w, 30 00 0a 00> 50 00 $l $l 00 00 $o $o <data>

<00 18 07> <02: 20 18 01 00 $w, 30 00 0a 00> 50 00 $r $r $d $d $p $p <data>}

<00 18 08> 0 18 18 01 00 00

$d is the bytes you already wrote.  You should write in 256 bytes chunks.
The full details will be in the next version, but that is all you need to
make it work on our current devices.

> >I think the only other question I had was how you know what the
> >Exclusive Login command does... Is that from decoding the COM APIs?

It's the name of the exported function.  I don't know 100% what it means. 
It sounds like it avoids concurrent access, but I am not sure if this is
really implemented in the firmware, or if it is just ignored.

> >I'm not questioning your conclusions, just trying to get clear in
> >my head how it all works.

Questions are good :)

> >Oh yeah, the other question was on encodings... when you say the
> >char and wchar versions are seperate, do you mean they can
> >have different values?

Oh yes.  You can store two distinct titles per track.  I really wonder what
this wchar business is about.  Is that used by japanese models?

Thanks,
Marcus

-- 
`Rhubarb is no Egyptian god.' GNU      http://www.gnu.org    [email protected]
Marcus Brinkmann              The Hurd http://www.gnu.org/software/hurd/
[email protected]
http://www.marcus-brinkmann.de/