Issue-7 created: https://www.w3.org/2011/audio/track/issues/7 Should arbitrary FFTs sizes be possible in the RealtimeAnalyserNode? Currently they are limited to a Power of Two. Jussi suggests we will get better performance from the API if we changed this. On Thu, Mar 22, 2012 at 7:07 AM, Jussi Kalliokoski < jussi.kalliokoski@gmail.com> wrote: > I hadn't actually even noticed this. Interesting. Why exactly should the > value be a power of two? It seems to me like the spec shouldn't say > something like this. Sure, power of two FFTs are easier to implement than > others, but IIRC they are rarely the fastest. And if we aim for > performance, the implementation should probably be using something like > FFTW that allows for any buffer size anyway. > > Cheers, > Jussi > > > On Thu, Mar 22, 2012 at 11:02 AM, Wei, James <james.wei@intel.com> wrote: > >> ** ** >> >> For fftSize in RealtimeAnalyserNode in the spec, it only says the value >> must be power of 2.**** >> >> ** ** >> >> But in fact in the implementation, the value must be limited in the range >> of [128, 2048], and it will throw the exception if illegal value of fftSize >> is set.**** >> >> ** ** >> >> Which should be documented in the spec. ** ** >> >> ** ** >> >> ** ** >> >> Best Regards **** >> >> ** ** >> >> James **** >> >> ** ** >> >> ** ** >> > > -- Alistair MacDonald SignedOn, Inc - W3C Audio WG Boston, MA, (707) 701-3730 al@signedon.com - http://signedon.com
Received on Thursday, 22 March 2012 15:29:15 UTC