RE: [Linphone-users] help: pda without soundcard

[Mike]

Jamey,

Thanks for your response.

I have a mips PDA running with uclinux os, and a DA/AD chip
inside the PDA, but my uclinux kernel does not have the DSP 
(/dev/dsp) driver. 

I have a non-standard DA/AD codes to play and record sound 
already. I need a drivers for this hardware DA/AD chip.
But I am still confued how many drivers are needed?
There are DSP (/dev/dsp), OSS, and ALSA drivers.

DO I still need the DSP driver on top of the OSS or
ALSA driver? 

Can OSS (or ALSA) driver work without DSP driver?

Which driver is better for the linphoneC ?

I am also wondering whether there is an small changes to
make the sound working without the DSP, OSS or ALSA drivers.

Is ther any free DSP, OSS, or ALSA drivers available?


Mike

-----Original Message-----
From: Jamey Hicks [mailto:address@hidden
Sent: Tuesday, December 09, 2003 12:28 PM
To: Mike
Cc: address@hidden
Subject: Re: [Linphone-users] help: pda without soundcard


On Tue, 2003-12-09 at 11:21, Mike wrote:
> Simon,
> 
> I ported the linphonec (0.12.1) to the mips PDA and is able to
> dial and termainate the call between the PDA and linux PC.

Congratulations!  That is progress.

> But the mips PDA does not have dial tone and ringback tone yet.
> 
> The mips PDA only has A2D/D2A and sound driver (dev/sound).
> There is no soundcard in this mips PDS, no dev/dsp and 
> no alsa driver either.

Ah, that would be a problem.
> I am stil unable to make the A2D/D2A working. The linphonec does use
> the dev/dsp driver. Do I need the dev/dsp and alsa drivers to make the
> audio working? Is there any easy way to bypassing the dev/dsp driver?

You could define a new soundcard interface in mediastreamer that
interfaces to your hardware's sound interface.  Or you could write an
OSS or Alsa driver for your hardware if you are running Linux.  What OS
is on your PDA?

> The "#ifdef for HAVE_SYS_SOUNDCARD_H 1" is turn on in the config.h,
> but I do not have the sound card in the PDS.

This is probably a problem due to running the configure script in cross
compilation mode.

Jamey