[linux-audio-user] gstreamer, rhythmbox, and mp3

Damon Chaplin damon at karuna.eclipse.co.uk
Tue Feb 6 10:23:24 EST 2007


On Mon, 2007-02-05 at 17:05 -0500, Paul Davis wrote:
> On Mon, 2007-02-05 at 16:41 -0500, carmen wrote:
> > On Mon Feb 05, 2007 at 01:59:29PM -0600, Victor Roetman wrote:
> > > 
> > > (and I really wish there was a jack backend for gstreamer)
> > 
> > there is. it didnt work very well for me (worse than alsa+plug:jack, just like XINE) but you might want to give it a shot
> 
> carmen, judging from the rest of your post, CPU usage was the main
> issue.
> 
> this is actually not a consequence of the JACK sink directly, but the
> appalling unoptimized resampling code in gstreamer. if you connect the
> JACK sink up to a stream that is already at the JACK sample rate, i have
> found you see the expected (low) CPU utilization.
> 
> the gstreamer guys know about this, but there is nobody available or
> with the know-how to speed it up. libsamplerate is not an option,
> apparently, because of the license :((

Apparently speex now has a resampler. That might be useful:

  svn co http://svn.xiph.org/trunk/speex speex
  then see libspeex/resample.c

Damon





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