[plug] Dual Sound cards

[andrew.mcmeikan at mitswa.com.au]

I have seen software for windows that can do fading between multiple mp3's
on the one sound card.  Perhaps the authors of mpg123 or similar products
may be working on a Linux version now?  If not, then a suggestion to them to
add it to their TODO list is probably not out of the question.

 As for car mp3, I am going to build a linear regulator and live with the
heat somehow.  Is a floppy in a car a good idea though?
Car phone input is a good idea, but I think I will go with a pause button.

	cya,	Andrew...


> -----Original Message-----
> From:	Brad Campbell [SMTP:brad at seme.com.au]
> Sent:	Friday, July 16, 1999 3:23 PM
> To:	plug at linux.org.au
> Subject:	[plug] Dual Sound cards
> 
> G'day All....
> Heres a good one..
> I have an .mp3 system that I wrote for windows, for Ballroom dancing DJ
> work.
> It has 2 independent .mp3 players, one for playing and one for cueing.
> In windows, I could do this coz I have a dual soundcard. This is
> unfortunately a 
> device with no linux driver. But I can make this work with 2 soundcards,
> coz windows
> will allow 2 or more sound drivers..
> Has anyone ever done this with linux ?
> I can't see any reason it would not work, but have not got around to
> trying it..
> maybe /dev/dsp and /dev/dsp1 ????
> I'm not sufficently familiar with the kernel driver model yet to know if
> you can do it??
> 
> I'm porting this system to linux and X, and of course at the moment, I am
> using one machine
> to control everything, and a second 'dumb' slave machine for the other
> sound channel over NFS
> and a tcp/ip channel for control.
> I'd like to be able to eliminate this second machine and pop a second card
> in the first machine...
> 
> Thanks for any pointers...
> 
> As an aside, the car pc psu for the in-car mp3 player is being difficult..
> We have blown up about $60 worth of Cap's and Fet's, plus wound numerous
> transofrmers.. Getting there slowly..
> Switchmode design is a lot harder than it looks :p)
> 
> The software is looking good, and the user interface is currently under
> development.
> This is a 40x2 LCD with some custom buttons.. This allows to create
> several playlists
> on a floppy and toggle between them in the car. With the usual
> skip/search/stop/go
> buttons. Also an input from a car phone to pause the music when the phone
> rings or a 
> call is made.
> 
> When I say several playlists, they are small text files, and you can fit a
> LOT of
> small text files on a 1.44 floppy :p)
> You can also fit a LOT of .mp3's on an 18GB Fireball Hard disk..
> Should be good for a couple of trips across the red centre :p)