[PD] 0 length delay in delwrite~

Christof Ressi christof.ressi at gmx.at
Sun Dec 13 21:45:11 CET 2015


No problem. :-)

By the way, I had a look at the source code and Miller actually included a routine to check for a possible block size mismatch, but at the moment it doesn't do much and the error message is surpressed:

-----------------------------------------------------------------------------------------

    /* routine to check that all delwrites/delreads/vds have same vecsize */
static void sigdelwrite_checkvecsize(t_sigdelwrite *x, int vecsize)
{
    if (x->x_rsortno != ugen_getsortno())
    {
        x->x_vecsize = vecsize;
        x->x_rsortno = ugen_getsortno();
    }
    /*
        LATER this should really check sample rate and blocking, once that is
        supported.  Probably we don't actually care about vecsize.
        For now just suppress this check. */
#if 0
    else if (vecsize != x->x_vecsize)
        pd_error(x, "delread/delwrite/vd vector size mismatch");
#endif
}

----------------------------------------------------------------------------------------------- 
 

Gesendet: Sonntag, 13. Dezember 2015 um 21:40 Uhr
Von: "Alexandre Torres Porres" <porres at gmail.com>
An: "Christof Ressi" <christof.ressi at gmx.at>
Cc: "pd-list at lists.iem.at" <pd-list at lists.iem.at>
Betreff: Re: Re: Re: Re: Re: [PD] 0 length delay in delwrite~

> So I'm quite astonished that you're accusing me of throwing
> around with apodictic statements
 
you're right, I was too harsh
 
sorry
 
2015-12-13 16:37 GMT-02:00 Christof Ressi <christof.ressi at gmx.at>:> just think outside your mind a little, think about other people that are not you...

I'm just giving my personal opinion. I can understand that you want to have more things working 'under the hood' and I'm in the opposite camp. But that's fine and as always the truth lies in the middle. If Miller decides that [delwrite~] should check for the block sizes of all the [delread] objects, that's perfectly fine for me.
No matter how stuff is implemented, the most important thing is that it's fully documented. I agree that Pd should be as accessible as possible, but that's mostly a matter of documentation.


> why would you insist in saying things are unnecessary just because you don't mind doing it

I'm giving personal opinions and I'm clearly marking them as such (adding phrases like "I think", "in my opinion"). So I'm quite astonished that you're accusing me of throwing around with apodictic statements.






 

Gesendet: Sonntag, 13. Dezember 2015 um 19:09 Uhr
Von: "Alexandre Torres Porres" <porres at gmail.com[porres at gmail.com]>
An: "Christof Ressi" <christof.ressi at gmx.at[christof.ressi at gmx.at]>
Cc: "Miller Puckette" <mpuckett at imusic1.ucsd.edu[mpuckett at imusic1.ucsd.edu]>, "pd-list at lists.iem.at[pd-list at lists.iem.at]" <pd-list at lists.iem.at[pd-list at lists.iem.at]>
Betreff: Re: Re: Re: Re: [PD] 0 length delay in delwrite~

Well, it's just a matter of opinion, you think it's unnecessary and I couldn't disagree more, we could just get it over with :)

But tell me, deep inside, if it did just work without you bothering with anything, would that be a problem to you? Cause it'd be a huge relief for me...
 
It's not even for me, I guess I could live with that, but I teach Pd for almost a decade now, I know something about newcomers... I'm an advocate of Pd and I try to make it as accessible and easy as possible, and I'd really have a problem with telling them (well, you gotta worry about all this stuff because there is a mentality in the Pd world that it'd be "unnecessary" for this to be automatically worked out for the user).

My life in Pd world is mostly devoted to teaching and advocating Pd as an user friendly tool, it has this power... 

just think outside your mind a little, think about other people that are not you... why would you insist in saying things are unnecessary just because you don't mind doing it - do you mind *not* doing it? What would you lose? Why making a case out of it?
 
well, again, in the end, it's a matter of opinion, but as a tie-breaking criteria, I think that making it easier for more people and more user friendly should count.
 
cheers
 
2015-12-13 15:54 GMT-02:00 Christof Ressi <christof.ressi at gmx.at[christof.ressi at gmx.at]>:>  add a bunch of samples to the delay ; work that internally

In a way, I agree on that, just add 64 samples so everything works for trivial use cases at block size 64. If you're using delay lines with other block sizes you're doing advanced stuff anyway.

> why live so hard?

Given that everything is documented cleanly, there's no higher math involved in getting the right buffer size, just a multiplication and a subtraction ;-).


> That doesn't seem crazy, get them all, check their block size, stay with the greater block size, work it out interbally, voilà...
> all the worries are over. Not too crazy and just elegant simple coding. You're treating this as a mission impossible where it's quite trivial to me.

I never said it's a mission impossible. I just said it's unnecessary. If [delwrite~] has fixed buffer size, why should it constantly change only because I change the block size in some subpatch? To me this sounds rather absurd. It's not like that we don't have to care about a lot things on our own (just think of fft subpatches!).




 
 

Gesendet: Sonntag, 13. Dezember 2015 um 18:34 Uhr
Von: "Alexandre Torres Porres" <porres at gmail.com[porres at gmail.com][porres at gmail.com[porres at gmail.com]]>
An: "Christof Ressi" <christof.ressi at gmx.at[christof.ressi at gmx.at][christof.ressi at gmx.at[christof.ressi at gmx.at]]>
Cc: "Miller Puckette" <mpuckett at imusic1.ucsd.edu[mpuckett at imusic1.ucsd.edu][mpuckett at imusic1.ucsd.edu[mpuckett at imusic1.ucsd.edu]]>, "pd-list at lists.iem.at[pd-list at lists.iem.at][pd-list at lists.iem.at[pd-list at lists.iem.at]]" <pd-list at lists.iem.at[pd-list at lists.iem.at][pd-list at lists.iem.at[pd-list at lists.iem.at]]>

Betreff: Re: Re: Re: [PD] 0 length delay in delwrite~

> At least we all agree that there's a mismatch between
> the docs and the actual behaviour.
 
that's a start
 

In my opinion, being able to use [delwrite~] and [delread~] at different blocksizes is a nice feature, so what about a nice little warning in the docs that you have to care about the buffer size if you're using different blocksizes?
 
Even failing to see how one thing prevents the other, my point is that you need to care about buffer size ALL OF THE TIME... it's never Good.
 
And in my point of view, it's just so simple: add a bunch of samples to the delay ; work that internally
 
Of course Miller could add some complicated mechanism for [delwrite~] to keep track of all the block sizes of its [delread~] objects.
 
That doesn't seem crazy, get them all, check their block size, stay with the greater block size, work it out interbally, voilà... all the worries are over. Not too crazy and just elegant simple coding. You're treating this as a mission impossible where it's quite trivial to me.
 , but to me the simplest solution is updating the docs and stating: "max. delay time = buffer size - block size of [delread~]"
 
Might be "simpler", but the craziest, and also the laziest, turning the user and patching experience into a nightmare. You're asking us to check all the block sizes and do the math ourselves and then convert it to ms and then insert it into a delwrite~ object... why live so hard?
 
cheers



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