[linux-audio-dev] jack_process and pitch-shifting

Steve Harris S.W.Harris at ecs.soton.ac.uk
Fri Apr 22 15:48:32 UTC 2005

On Fri, Apr 22, 2005 at 05:13:47PM +0200, Olivier Guilyardi wrote:
> Hi,
> In Jackbeat, I want to include support for realtime pitch shifting. One 
> of the option is to use a quality resampler as libsamplerate's 
> SRC_SINC_BEST_QUALITY converter.  In the future, I may add support for 
> libsoundtouch1 (http://sky.prohosting.com/oparviai/soundtouch/index.html).
> Can I do that in the jack process callback ? Or should I span a new 
> thread and do the heavy job in there, ringbuffer'ing the result to the 
> RT thread ?

Doing heavy jobs in the process() callback is fine, as long as the CPU
load is deterministic. I this case I think it should be.

- Steve

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