Re: [Iaxclient-devel] speex echo cancellation tested?

[Matthew C. <mc...@no...>]

On Fri, 2008-04-25 at 15:16 -0600, Matthew Crane wrote:
> On Fri, 2008-04-25 at 14:24 -0600, Matthew Crane wrote:
> 
> > Unfortunately, it looks like some sort of audio problem has crept in
> > between 2.1beta3 and now (at least on SLED 10).  Incoming audio sounds
> > very choppy.  I turned echo cancellation off -- problem still there.  I
> > compiled using --without-echo-can -- problem still there.
> > 
> > I'm going to checkout a version of the trunk from a few days ago to see
> > if the echo-cancellation merge introduced these problems or if it was
> > something earlier.
> > 
> > -Matt
> > 
> 
> More info:
> 
> A build of the trunk checked out with "-r {2008-04-20}" has got audio
> working correctly.  The current trunk as well as Mihai's echocan branch
> have both got audio problems (lots of dropouts -- like several per
> second) on SLED 10.

Okay, I've found the source of the problem.  In audio_portaudio.c, the
framesPerBuffer parameter in calls to Pa_OpenStream() was changed from
paFramesPerBufferUnspecified to SAMPLES_PER_FRAME.  When I changed it
back to the old value, audio sounds okay.  For whatever reason, the new
value causes very choppy audio playback in SuSE Linux.

I suspect that we will need the fixed value of SAMPLES_PER_FRAME in
order for echo cancellation to work, though, huh?  :-)

-Matt