[PD] FUDI protocol and interfacing external programs with netreceive

[afleck]

Hello,

I have been looking into writing some external programs to send messages 
to pd via netreceive.


With netreceive in udp mode (-u), sending bytes not terminated by a 
newline does not generate anything at the outlet.
By "sending bytes" I do not mean that I have netreceive in -b mode, just 
that I am not automatically terminating the message with a newline,
as would happen with "echo foo; | pdsend  localhost udp." In -b mode 
no newline is necessary.


As soon as a newline is added, the message is at the outlet. 
Furthermore, it's actually not even necessary to include a semicolon in 
the datagram.
If i send the bytes \102\111\111\10 ("foo\n") to a netreceive connected 
to print, i see "print: foo" in the console.


This is not at all clear from either the help patches on netsend and 
netreceive or the little information available online about FUDI,
all of which mention that a message is just atoms, numbers, and 
whitespace terminated by a semicolon. The Wikipedia page on FUDI even 
says


"A newline is just treated as whitespace and not needed for message 
termination." as far as I can tell this was sourced from a (now offline 
but archived) pure data wiki page, the genesis of which can be found at: 
https://lists.puredata.info/pipermail/pd-list/2009-01/067238.html.


There's a good lead at 
https://lists.puredata.info/pipermail/pd-list/2013-01/100183.html, 
mentioning the required newline, but it also says a semicolon is 
required, which I have found to not be the case.


Can anyone clear this up for me? Is there any official specification of 
FUDI available? I think having this information easily available would 
be nice, and after I get to the bottom of it I'll correct the Wikipedia 
page!


I would also like to know how to send multiple messages in one datagram. 
Sending "foo;bar;\n" to a netreceive connected to print only gives me 
"print: foo" at the console, and trying to [route foo bar] doesn't work.


Cheers



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[PD] Best practices for pitch shifting a sample?

[afleck]

Hello,

I started thinking about this problem because I was doing some frequency 
modulation, but when I tried to change the carrier frequency directly 
with notein and mtof~  there were sometimes unpredictable results (which 
can sometimes, but not always, be remedied by maintaining a fixed ratio 
between the carrier and modulation frequencies).


DAWs like Ableton allow you to select a sample (such as a kick drum) and 
then play it at a bunch of different pitches (i.e. with a midi 
keyboard). How do they accomplish this? Is it with variable delay?


I've been looking at the section on pitch shifting in Puckette's book 
(http://msp.ucsd.edu/techniques/latest/book-html/node115.html#sect7.pitchshift), 
but I thought I would ask if there's an easier way before I take the 
plunge.


I've tried granular synthesis but it doesn't preserve the timbre very 
well.


To be clear, I don't just want suggestions of externals, I actually want 
to program it myself (in pd-vanilla)


Best,
Andrea

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