Re: [Linphone-developers] Implementing sound support for non-standard hardware

[Simon Morlat]

Hello,

Yes you can add a new SndCard implementation to handle your problem.
This interface is expected to change in 1.0.x .
Writing an oss driver can be very useful for everyone, but if it is for an old 
kernel and for a hardware that is not very spread,  I understand your point 
of view.
But anyway you'll need a kernel driver to talk to your hardware, so maybe it 
is not so hard to implement some very minimal oss functionnality (at least 
the one necessary to linphone).
Simon

Le Mercredi 8 Décembre 2004 19:24, Daniel Kabs [ML] a écrit :
> Hello Linphone-Developers,
>
> running Linux on an ARM platform, I managed to compile libosip-0.9.7
> and linphone-0.12.2 "out of the box". I compiled the command line
> version "linphonec" using ¹)
>
> ./configure --prefix=/usr --enable-gnome-ui=no
>
> Problem:
> My kernel is version 2.2 and has neither OSS nor ALSA support and uses
> non-standard devices to play and record sound. These devices work with
> 8kHz, mono PCM data (either 8 bit A-Law or 12 bit linear). I'd like to
> make linphone work with my audio hardware.
>
> My first idea was to define a new soundcard type in
> mediastreamer::sndcard.c that "interfaces" to my hardware's audio
> devices.
>
> Can you give me any hints about what functionality is required by the
> interface functions defined in mediastreamer::sndcard.h::SndCard ?
>
> Do you know if these functions will change in linphone-1.x ?
>
> If so, I'd be better off writing an OSS/ALSA driver. Although in my
> opinion, writing an OSS or ALSA driver is not the best idea, as it
> probably takes a lot of time or may not even be possible for my audio
> hardware (due to its limited capabilities) and for my "old" kernel.
>
>
> Thanks for your help,
> Cheers
> Daniel Kabs
> Germany
>
>
>
> ¹) Configure did not abort because I have a "faked" sys/soundcard.h
> include file.
> The resulting config.log showed:
> ac_cv_header_machine_soundcard_h=no
> ac_cv_header_soundcard_h=no
> ac_cv_header_sys_soundcard_h=yes
> ac_cv_header_sys_audio_h=no
>
>
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