[pulseaudio-discuss] Module to sink to a device

[nikhil.rao at wipro.com]

Hi Lennart,

Thanks for your reply.

I was just wondering. Can I re-use the module-pipe-sink such that
instead of operating on a FIFO Pipe file("/tmp/fifo.output") use my
/dev/XXX node? When I say re-use I'd change the way buffer size/sample
rate/format is changed as per my requirements.

Kindly throw some light on this. 

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Please Ignore the footer of this mail. :)

Thanks,
Nick

-----Original Message-----
From: pulseaudio-discuss-bounces at mail.0pointer.de
[mailto:pulseaudio-discuss-bounces at mail.0pointer.de] On Behalf Of
Lennart Poettering
Sent: Saturday, April 18, 2009 11:40 PM
To: pulseaudio-discuss at mail.0pointer.de
Subject: Re: [pulseaudio-discuss] Module to sink to a device

On Fri, 17.04.09 18:53, nikhil.rao at wipro.com (nikhil.rao at wipro.com)
wrote:

> Hi,

Heya!

> I am very new to pulseaudio and this forum. Hence I am not sure if 
> this topic has already been discussed here.
> 
> I am working in Linux environment. I have a device and a corresponding

> device driver that is capable of handling synchronous audio. The 
> device is exposed in a form of simple device node say "/dev/XXX".
> 
> So my question is can I develop a loadable module which can sink to 
> the /dev/XXX device? Is there any module currently which works in my 
> direction?

All output modules for Unix kernel APIs work like that. The ALSA, the
OSS and the Solaris driver too.

If you work on Linux and you are working on a kernel audio driver then
the best solution is to simply make it a proper ALSA driver. That would
free you from writing a special PA module for that.

> I have gone through the existing set of modules, I found that 
> module-oss and module-solaris sink/source currenlty is capable of 
> open/write/read device like /dev/dsp (please correct me if I am
wrong).

Yes.

> It would be great if I get any sort of pointers on how to approach on 
> this.

There a couple of pages in the wiki that explain how to write PA
plugins. Take them with a grain of salt however, since they tend to be
out of date. Otherwise: read the sources! If you have questions ask them
on the ML or on #pulseaudio on freenode.

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Nice. Maybe you shouldn't post anything to a public mailing list with
nonsensical demands like this. I mean, come on, all our traffic is
archived in public mailing list archives.

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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