[PD-dev] help designing multichannel aware externals

[Miller Puckette]

I think I hadn't pushed them, oops.  And now I'm thinking again - maybe it's
more elegant yet to provide empty output signals (channels=length=vec=0)
and instead of (for example)     
   sp[2] = signal_swapforchans(sp[2], outchans);
you'd just write
   signal_setchans(sp[2], ouchans).

cheers
Miller

On Wed, Jan 25, 2023 at 03:42:15PM +0100, Christof Ressi wrote:
> Cool!
> 
> I don't see these changes yet. Did you forget to push them or are you still
> working on it?
> 
> (I am working on some clone multi-channel bugfixes and I would need the new
> signal_swapforchans() function :-)
> 
> Christof
> 
> On 25.01.2023 05:46, Miller Puckette via Pd-dev wrote:
> > OK, just now changed this - there's a one-channel signal created for all
> > signal outputs.  Now if you want more than one channel you have to call
> > signal_swapforchans() (see d_arithmentic for example).
> > 
> > cheers
> > M
> > 
> > On Tue, Jan 24, 2023 at 08:07:22AM +0100, IOhannes m zmoelnig wrote:
> > > On 1/24/23 04:54, Alexandre Torres Porres wrote:
> > > > Em seg., 23 de jan. de 2023 às 14:34, IOhannes m zmoelnig <zmoelnig at iem.at>
> > > > escreveu:
> > > > 
> > > > > multichannel objects must create the output signals themselves.
> > > > > (as the object might change the number of channels).
> > > > > 
> > > > even with [nchs~] where I'd have a fixed number of inputs/outputs?
> > > yes.
> > > with all multichannel aware externals.
> > > how would Pd know the fixed number of outputs, if you don't tell it?
> > > 
> > > > 
> > > > > see the example (mostly: pack~)
> > > > > 
> > > > I saw it and it's quite simple, withou a 'perform' routine it uses a copy
> > > > function.
> > > the interesting part is the "dsp" method.
> > > you cannot change the number of output signals in the perform routine (that
> > > is: every tick).
> > > but you can change  (or rather: must set) it when the DSP-graph is created,
> > > thus in the "dsp" method.
> > > 
> > > 
> > > mgfdsrfad
> > > IOhannes
> > 
> > 
> > 
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