re :Re: audio device v 0.9

[john_blakeley@mon.bbc.co.uk]

Hiyah Konrad	

 Re: audio device 0.9


> Hi John,

> one more notice:

> > 	'actrl chan 4' allows you to audition 4 channel samples if you
> > 		have the necessary external hardware for your falcon! You can
> > 		also try 6 or 8 too!

> the internal Falcn sound subsystem DOES support four stereo channels,
> AFAIK.

I know but you can only monitor 1 stereo pair at a time unless you program 
the dsp to mix all the tracks for you...and unfortunately my programming 
knowledge does not (yet?) extend to 56001 assembler...there is a xbios call 
to select which (stereo) track to monitor.

I thought that it would be really nice if someone put together a /dev/dsp 
that had some supplied functions that you could choose to do for example, 
jpeg decompression, audio mixing and any other general purpose dsp routines 
just by issuing a command like `dspctrl devaudio mix 2 1` which would cause 
the dsp to connect itself into the audio subsystem and when you cat a 2 
stereo pair file at /dev/audio, the dsp would mix the two stereo tracks into 
one and output them to to /dev/audio which you would have previously 
configured for 2 channel operation.

Bit of a pipe-dream though :-)

Salut/.

J/.

ps if anyone has a hades, etc with one of those startracker audio boards(??),
 please let me know if this works otherwise I'll have to tweak it. 
Unfortunately I had to access the registers directly rather than using the 
xbios, - which tended to hang the system...:-(