Hi all - There's an example in B16.long-varispeed.pd that shows how you can use offsets into long arrays - this allows you to use the signal input within a smaller range (ideally < 1 second) to get accurate addressing.
cheers Miller On Tue, Mar 31, 2015 at 11:07:52AM -0400, William Huston wrote: > I have a related question. > > I am intermediate PD programmer, about 9 months into patching. > I really love PD, despite some quirks. > > The single most annoying issue I have found so far is the inability for PD > to accurately index into large arrays. > > The way this manifests is very curious! I first noticed high frequency > noise at maybe 6 min. into an array, which gets worse as you move into the > file. At 20 min, it's really horrible. > > I would say the root cause is > > a) lack of a long integer datatype. Friends, sometimes you really want > ints, like accurately indexing into an array, and > > > b) lack of precision in (short) floats. > > People on the FB group promptly told me this is a well-known issue, and > directed me to PD-double. This sounds like a wonderful project, however it > seems it is only beta, and breaks several of the modules in extended. > > So I am wondering 2 things: > > 1) What solutions have people come up with for accurately reading big > arrays at audio rate, using either pd-extended or vanilla? > > (I have considered breaking the big file up into smaller arrays, but this > is cumbersome). > > 2) What is the long-term goal at solving this problem? > > Thanks :) > > > > > > > > > On Tue, Mar 31, 2015 at 5:51 AM, peiman khosravi <[email protected]> > wrote: > > > Sorry, forgot to reply to all. > > > > Hello, > > > > I had this problem in maxMSP recently and found a working solution. Note > > that I was only on a laptop so I don't know how relevant this is to your > > question. Below is the solution I found on the Max forum (I don't have the > > link right now but it should come up on google). > > > > 1- Read the file [silently] from disk (using sfplay~ or equivalent), at 50 > > times the original speed and record the output into a buffer that is 50 > > times smaller than the original file. > > > > 2- You can navigate through this smaller buffer and multiply the output by > > 50 to get the correct time pointer into the original file. I then read the > > original file from the disk, instead of loading it into a buffer. > > > > 3- Since I'm making my patch for concert playback, I have put in place a > > checking mechanism that looks for an existing 'waveform' file. (The patch > > automatically names these originalFileName.wave.aif.) If it exists, the > > waveform file is read into the buffer, otherwise, the loaded soundfile is > > 'analysed'. > > > > I can send you my patch if you are interested. I don't see any reason why > > this can't be implemented in PD. Although the graphical scrolling might be > > slower in PD. I'd be interested to know if this works in PD. > > > > Best, > > Peiman > > > > > > > > > > *www.peimankhosravi.co.uk <http://www.peimankhosravi.co.uk> || RSS Feed > > <http://peimankhosravi.co.uk/miscposts.rss> || Concert News > > <http://spectralkimia.wordpress.com/>* > > > > On 31 March 2015 at 10:18, Stefan Tiedje <[email protected]> > > wrote: > > > >> Hello list, > >> might well be the first post here, though I am well experienced in > >> Max/MSP... > >> As there is no way to get Max patches run on mobile devices, I want to do > >> it in PD using the MobMuPlat apps for Android/iOS. > >> The task would be to simply to play a stereo sound file, but of about one > >> hour lebgth. As MobMuPlat only supports vanilla PD I am restricted to that > >> as far as I know. > >> In the docs and on the net I did not find any way to navigate within that > >> playback. (Its crucial for rehearsals.) The size is too big for loading it > >> into RAM (the mobile devices which are around often have less than 1 GB of > >> RAM), Is there a known way to tackle this seemingly simple task??? > >> A tedious way, I want to avoid, would be to split the sound file into > >> pieces, which would at least let me jump in at specified places, but that > >> would eat up the space on the device, as each piece would have to play > >> until the end... > >> Of course I would also love to find a way to play back an mp3 and freely > >> navigate within that as well... > >> Any hints how to proceed are appriciated... > >> > >> Stefan Tiedje > >> > >> -- > >> Les Ondes Memorielles--------x-- > >> -_____-----------|-----------|-- > >> -(_|_ ----|\-----|-----()------- > >> - _|_)----|-----()-------------- > >> ---------()----------TJ Shredder > >> http://tjshredder.wordpress.com/ > >> > >> _______________________________________________ > >> [email protected] mailing list > >> UNSUBSCRIBE and account-management -> http://lists.puredata.info/ > >> listinfo/pd-list > >> > > > > > > _______________________________________________ > > [email protected] mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > > > > > > -- > -- > 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>* > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
