New subject: [linux-audio-dev] Re: fast linear resampling on ARM - suggestions?

29 Mar 2006

"Tobias Scharnberg":
...

 Hello List,
 I'm trying to find a library or code-snippet in order to do audio
 resampling from 8khz to 44,1khz and from 44,1khz to 8khz. I need to
 resample the data in realtime - resampling a buffer of data, not a
 soundfile. The quality doesn't need to be good so I guess the best
 solution might be linear audio resampling. The device to do the
 resampling on is an ARM CM-X255 running at 400MHz.

 I tried out libsamplerate so far but when I tested it with the
 soundfile conversion test program it needed 3,5 secs to sample from
 8kHz to 44,1 khz for a 1,7 secs audiofile - which is too slow for me.

 Is there something faster that can do the job?

Was this with the linear resampler lib libsamplerate? In case, you should 
know that its terrible slow. Last time I tried, the fastest sinc resampler 
in CLM was almost as fast as the linear resampler in libsamplerate.
(Erik, you should do something about that...)

I don't know of any other libraries that does linear resampling, but its
not that difficult to make one manually. I'm sure there are example codes
floating around as well.