Re: [LAD] LADPSA and LV2 Sample Types
I need to correct a mistake in what I wrote yesterday. VST3 does support double precision samples, and for whatever inexplicable reason even makes it the default. Thanks to Robin Gareus for pointing this out. Also, to follow on from something Fons wrote: an actual 32 bit sample value would have at least the low 4-6 bits representing brownian (atomic) motion. That's pretty crazy. On Mon, Mar 6, 2017 at 9:30 PM, Paul Davis wrote: > > > On Mon, Mar 6, 2017 at 8:59 PM, Taylor wrote: > >> Hey, >> >> I'm a little bit new to LADSPA and LV2, so this may be a naive question. >> >> I would like to know why single precision floating point types are used >> in the plugin interface, instead of double precision. >> >> I would also like to know if there are plans to standardize a plugin >> interface that may process double-precision instead of single-precision >> data (or both). >> > > Nobody needs double precision when moving data between host and plugins > (or from one plugin to another). > > You might be able to make a case for double precision math inside a plugin > (and indeed several people have). But once that particular math is done, > single precision is more than adequate. > > As to why because everybody else who knew anything about this stuff > was using 32 bit floating point already. > > No existing plugin API supports double precision floating point as a > standard sample format (you could do it in AU, but it would involve a > converter to/from single precision on either side of the plugin that asks > for this. > > ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] LADPSA and LV2 Sample Types
On Tue, 7 Mar 2017 11:34:34 +0100 Paul Davis wrote: > I need to correct a mistake in what I wrote yesterday. > > VST3 does support double precision samples, and for whatever inexplicable > reason even makes it the default. > > Thanks to Robin Gareus for pointing this out. > > Also, to follow on from something Fons wrote: an actual 32 bit sample value > would have at least the low 4-6 bits representing brownian (atomic) motion. > That's pretty crazy. Adding to this, even 16 bit has a dynamic range of over 90dB. There is a quite dramatice demo at that depth of a garage door being slammed after the demonstrater talks rather quietly - sorry, I can't find it now. By the time you reach 24bit, you're well below any reasonable accoustic noise level, and are getting into the region of thermal noise in analogue equipment. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] LADPSA and LV2 Sample Types
On Tue, Mar 07, 2017 at 11:34:34AM +0100, Paul Davis wrote: > Also, to follow on from something Fons wrote: an actual 32 bit sample value > would have at least the low 4-6 bits representing brownian (atomic) motion. > That's pretty crazy. To put this in perspective: To have a dynamic range corresponding to roughly 27 bits, an analog signal needs to have full scale power of 1 Watt (since thermal noise in 20 kHz is around -161 dBW, and 161 / 6 ~= 27). For 32 bits you'd need more than a kilowatt at the point of conversion between analog and digital and in every analog signal point before or after. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
