[mythtv] [PATCH] MythPhone - prevent sending garbage video whenwebcam grabs smaller video than we want to send

Robert Rozman rozman at fri.uni-lj.si
Wed Jan 26 19:42:17 EST 2005


----- Original Message ----- 
From: "Ed Wildgoose" <lists at wildgooses.com>
To: "Development of mythtv" <mythtv-dev at mythtv.org>
Sent: Wednesday, January 26, 2005 11:02 PM
Subject: Re: [mythtv] [PATCH] MythPhone - prevent sending garbage video
whenwebcam grabs smaller video than we want to send


> Jeremiah Morris wrote:
>
> > On 26 Jan 2005, at 10:13 AM, Malte Böhme wrote:
> >
> >> i am currently working on
> >> konference again and would like to add a more flexible way of
> >> handling audio
> >> input/output. have you ever looked at kphone source? they have a more
> >> flexible way of handling audio (alsa, oss, jack).
> >
> >
> > Actually, so does Myth; in libmyth there's a set of audio output
> > classes with drivers for Alsa, OSS, JACK and more. Ed Wildgoose
> > revamped this API and converted mythmusic to use it; that's the right
> > thing for mythphone to do, to gain extra flexibility at very little
> > cost. Perhaps this code would work for your needs in konference, at
> > least for the output part of the problem.
> >
>
> I would be quite happy to recode it to allow input and output.
>
> Having synchronised in and out audio will be essential if we ever want
> to support accoustic echo cancellation.  I have been reading up on some
> algorithms, it's quite complicated though and there is no algorithm
> coded up (for free) that I can see.  It's something of a special case of
> the room correction stuff that I use in my hifi setup though.
>

Perhaps this will be of some help:

http://www.isip.msstate.edu/projects/speech/software/legacy/fir_echo_canceller/

Regards,

Rob.



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