Re: [Linphone-users] any codecs on ARM SA110 -feedback

[Simon Morlat]

The sound control code for oss is in mediastreamer/osscard.c. I think your oss 
driver doesn't like the way linphone uses it: minimum latency using the 
SUBDIVDE ioctl() and non-blocking read() (uses select with 0 timeout before).
You can try some changes in osscard.c to try to figure out what is going 
wrong.
Good luck,
Simon 

Le Mercredi 4 Mai 2005 07:27, Anand S. Katti a écrit :
> Hi Simon,
>
>       Im glad to get your comments on this.
> I have suspected scheduling issue at the read/write operation. To find out
> , i just wrote a voice send/receive socket program for simputer PDA.
> I have a small jitter buffer of 5x160 bytes. This program worked well, i
> could speak and hear proerly on the PDA. There was no voice clutter or
> delay in playback.
>
> Simputer has on board Philipls sound chipset.
>
> Could you please suggest me any alternatives on solving this problem.
>
> Thanking you in advance,
> Anand
>
> On Tue, 3 May 2005, Simon Morlat wrote:
> > Hello,
> >
> > This problem is usually caused by "not really good" oss sound drivers,
> > especially in full duplex mode. I hope alsa drivers to solve that (as
> > they did for PCs) but there are not finished for all PDA's sound chipsets
> > of the world.
> >
> > Simon
> >
> > Le Mercredi 27 Avril 2005 19:15, Anand S. Katti a écrit :
> > > Dear All,
> > >
> > >
> > > I have tried almost all possible options to get uncluttered voice on
> > > strong ARM PDA. Now im left with no options other than this list.
> > >
> > > cross compilation of libosip2 and linphone-1.0.1= OK
> > > cross compilation os SPEEX 1.17                   = OK
> > > sound driver                                      = oss
> > > ALSA DRIVERS=tried cross compiling for strong ARM but failed 1000 times
> > > in asm code.
> > > VOICE CALL        = OK
> > > CODECS used       = GSM, PCMU,PCMA
> > > SPEEX             = quality pathetic, may be because of FP OPERATIONS.
> > >
> > > PROBLEM= with any of the above codec, i hear very choppy voice, quality
> > > is ok but its cluttered. I feel as if the sound card is closing and
> > > opening....
> > >
> > > Could you any of you please get the odd man out of this ?
> > >
> > > SPECS: intel strong arm PDA
> > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
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