Re: Midi reverb on Emu10k1

[Takashi Iwai <tiwai@suse.de>]

Hi,

At Mon, 24 Jun 2002 20:38:00 +0200,
Nicola Orru' wrote:
> 
> Hello, people out there!
> 
> I'm Yet-Another-Programmer-Keyboard player.
> I would like to work on MIDI chorus/reverb implementations on the emu10k1 driver in a way 
> I can experience as much fun as original Creative driver provide on Windogs.
> 
> Where should I start from? How much work is needed to complete the sub-project?
> Where can I find documentation about that?
 
this is one of long standing todo's.

the implementation needs to steps.

1. write a dsp loader program to communicate with the alsa-drivers via
   emu10k1's hwdep ioctls.

   there is already an assembler, which was ported from oss driver's
   program.  but it's never tested, i think.

2. adds a code to assign the dsp codes to certain midi controls in
   emu10k1 driver.

once the first one is ready, then it wouldn't take long time to do the
2nd step.  i have already some idea about the latter.


> Currently, I am trying to learn more about DSP architectures and 
> digital filter programming on several online books, but, 
> as I have little patience, I would like to "beat the metal" as
> soon as possible.
> 
> Any hints, pointers to TFM, will be sooo happily accepted.

the oss emu10k1 driver has already good examples for dsp codes on sb
live.  but the interface is different between alsa and oss drivers, so
you cannot use them straightforwardly.
the oss emu10k1 archive also includes some documents about dsp codes
on emu10k1.

the problem is, as written above, the implementation of loader.
how to manage static and dynamic routings, and so on.


ciao,

Takashi


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