[ros-dev] Open Sound System porting

[Magnus Olsen]

Hi
I been looking if it was posible todo, but it is not
it is allot lowlevel stuff u need emulated, Linux kernel handling DMA, IRQ,
IO complete diffent
and it is not posible port OSS driver to windows arch or ros, it will be
involed around 2 year coding
todo so, see the USB stack that is from linux crow stack, and the network
stack from freebsd
both took two year getting alive in reactos. and it is really bad idea
trying proting OSS
it will invold another 2 year works only getting it alive, then u need
getting bugs out.
sorry to say that. it is almost same time frame getting OSS and orginal WDM
audio
driver working. in devloping time. and it is bad decistions using OSS




----- Original Message ----- 
From: <reactos-development at silverblade.co.uk>
To: <ros-dev at reactos.org>
Sent: Saturday, September 22, 2007 2:27 AM
Subject: [ros-dev] Open Sound System porting


Hi guys,

I've been in touch with the guy that ported OSS to Haiku (open-source BeOS)
after some
discussion with the folks over at #winehackers to get some help with audio
development.

Anyway, basically the idea so far is to use OSS as a "fall-back" audio
driver
implementation. So unless there is a "better" driver installed (ie an
official one for
an audio device), ReactOS can use an Open Sound System driver instead.

The result? There will at least be sound functionality.

OSS is designed to be mostly platform-independent. By rewriting a few of
the core
modules, the entire set of drivers will be able to work with whatever
platform you
desire.

This can be implemented on top of the existing MME API architecture for the
moment, and
can later be translated to use the WDM audio framework.

Anyway, having stuck the OSS code into my local ReactOS source tree, I'm
trying to
figure out how to get it to compile using rbuild. The first hurdle I have
come across is
that there is extensive use of ioctl. Indeed it seems that most ports of
OSS work on
platforms based on Posix (Unix?)

So my main question at this time is how to handle this? The calls in
question appear to
be documented inside a file called "soundcard.h" in the OSS sources however
this just
seems to be definitions for the ioctl codes. So I suspect a majority of the
drivers are
calling ioctl.

Therefore, I figure the best way around this is probably to provide a fake
ioctl that
provides the expected functionality, and make this wrap DeviceIoControl
with something
that can translate the ioctl parameters into whatever...

The only other way I see around this is to rewrite all calls to ioctl, and
rewrite the
IOCTL codes with NT-style ones.

Thoughts/ideas?

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