With a pair of single-precision floating-point numbers you can specify arbitrary sums to about 47 bits of precision. This is less than the 56 bits (I think) that a double precision number has, but it's enough, for instance, to specify locations in an hour-long soundfile at 96K down to less than 1/10000 of a sample.
This can be done, for instance, by making the first of the two numbers represent exactly a mmultiple of 256 (up to about (256 * 16,000,000) and the second one a value less than 256 with 16 bits of fraction (plus 8 of integer part). This is in effect how the demo patch B16-long-varispeed work.s But it's tricky to do - I should really put an abstraction in extra to help people do it :) Miller On Tue, Jun 02, 2015 at 04:14:22PM -0400, William Huston wrote: > I so wish these double precision float patches could be rolled into the > main branch. > > This issue of indexing into long arrays is the biggest thing impacting my > PD joy I've found. > > Unless I'm missing something, the onset inlet to [tabread4~] is not an > acceptable solution, since it is only *added* to the value (address) on the > left inlet. So instead of first encountering noise at 150,000 bytes into > the array, we defer the problem to 300,000? This is just 7 seconds @ > 44.1khz, and I want to work with audio files potentially 2 hrs long. > > Thanks Katja for your work on this. > > On Tuesday, June 2, 2015, Arshia Cont <[email protected]> wrote: > > Thank you Katja for the swift response! We will wait for that then. > > > > Any one running into run-time problems when compiling with C++11 or > C++14? We seem to have memory alignment issues… . > > > > Arshia Cont > > > > > > > > > >> On 02 Jun 2015, at 14:23, katja <[email protected]> wrote: > >> > >> On Tue, Jun 2, 2015 at 1:07 PM, Arshia Cont <[email protected]> wrote: > >> > >> [...] > >> > >>> My second question would be on double-precision audio externals.. I see > discussions on class_new64 but can’t seem to find any trace of it in > 0.46-6.. I dig into the archives to figure this one out first! > >> > >> In 2011 I made a set of patch files for vanilla pd 0.43 to enable > >> double precision builds (where t_float and t_sample are doubles). That > >> can be found here: > >> > >> https://github.com/pd-projects/pd-double > >> > >> You could try it out for evaluation but Miller wants to scrutinize, > >> test and improve the patch files before accepting them. > >> > >> Katja > >> > > > > > > _______________________________________________ > > Pd-dev mailing list > > [email protected] > > http://lists.puredata.info/listinfo/pd-dev > > > > -- > -- > May you, and all beings > be happy and free from suffering :) > -- ancient Buddhist Prayer (Metta) > > Don't forget to sign the > > *Pledge to Resist* > > *the Constitution Pipeline:* > > - *The Pledge: TinyURL.com/Pledge2ResistCP > <http://TinyURL.com/Pledge2ResistCP>* > - *More info: TinyURL.com/Pledge2ResistCP1 > <http://TinyURL.com/Pledge2ResistCP1>* > _______________________________________________ > Pd-dev mailing list > [email protected] > http://lists.puredata.info/listinfo/pd-dev _______________________________________________ Pd-dev mailing list [email protected] http://lists.puredata.info/listinfo/pd-dev
