Olivier Guilyardi wrote:
Hi Erik,
Erik de Castro Lopo wrote:
Kjetil Svalastog Matheussen wrote:
I recently did a lot of benchmarking between libsamplerate and mus_src
in clm/sndlib. My result was quite interesting, the fastest mus_src
sinc
resampler where a lot faster than the fastest libsamplerate resampler.
I think most people would agree that speed is not the most important
aspect when measuring the quality of a sample rate converter.
I believe libsamplerate, as a general purpose sample rate conversion
library, should be able to run very fast if needed. After including
your library into Jackbeat (http://www.xung.org/jackbeat) I was pretty
sad to see 40% of my 700Mhz Duron load dedicated to processing only
six tracks with libsamplerate's SRC_LINEAR converter.
Then, I coded a trivial sample rate conversion routine by myself :
- it sounds good, I can't hear any difference with the SRC_LINEAR
converter
I think the issue here is the application, and what you mean by good ?
If the usage is purely sampling rate convertion, as a final stage before
mastering, then linear interpolation sounds really bad, there is no
question about it. Now, if it is used inside a processing effect, it may
be enough (I remember having used a linear interpolation for time
stretching processing, and the linear interpolation was certainly not
the weak point in the processing chain).
David
