Fluid.bufnmf~ "Machine Learning Filter"

rodrigo.constanzo · December 5, 2018, 10:26pm

Here’s a simple/fun patch for “filtering” audio using fluid.bufnmf~ decomposition to break a sound into 127 components, then “filtering” that audio by gradually killing off channels of the decomposition.

You can also change the “filter shape” by scrambling the channel order.

A better version of this would fade each channel in/out to make it more seamless, but there’s a tradeoff between the ability to filter the audio (filter step granularity) and the overall grittiness/crunchiness of each respective channel.

There’s probably some massaging that can happen with the fluid.bufnmf~ settings too, but I just pulled settings out of the help file to use as ‘default’.

Curious on people’s thoughts and/or possible improvements here.

Oh, it’s Max8 only as there’s a bit of mc. stuff involved. (also open to mc. suggestions, as what I’ve done feels very fucking clunky, but I couldn’t figure out how to play a multichannel audio file as an mc. signal without doing this play~ -> mc.pack~ thing)

Using mc. “properly” here would also allow for smooth crossfading between channels, but I didn’t get that far with it.


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rodrigo.constanzo · December 5, 2018, 10:50pm

Ok here’s a version with audio crossfading. Man, mc. shit is confusing, and the helpfiles aren’t nearly detailed enough. (how do you set the ramp time to mc.line~ either permanently or dynamically?!)


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-----------end_max5_patcher-----------

tremblap · December 6, 2018, 3:11pm

Thanks for this! It reads like an amazing idea… but I am now sad I don’t have Max8… any chance of a glorious mono Max7 version ?

tremblap · December 6, 2018, 3:18pm

Pretty please? I’ll give you an extra hug…

rodrigo.constanzo · December 6, 2018, 5:20pm

It is mono, I’m just using the mc. stuff to not have a messy poly for doing the individual muting of channels (though it was clunkier than I thought it would be, which led to a post on the Max forum).

Max7?! I thought you were a Max5 guy…
Do none of you there have Max8 to test with at the office?

If/once I wrap my head around the mc. bits, I think it will make negotiating the fluid. world a bit easier, since it will be possible to create simpler patches that still address all the channels.

It shouldn’t be too bad to adapt it as the heavy lifting is the nmf~ objects. The mc. stuff is just happening instead of a 127 voice poly with line~ and *~ in it. I guess the scramble thing wouldn’t be as elegant, but the sound should still work.

Also in testing further I got better sound (but obviously longer calculation time) from these settings:
@iterations 1000 @winsize 1024 @hopsize 256 @fftsize 4096

tremblap · December 7, 2018, 9:44am

I’ll see if I can squeeze some coding time today to port it then - will share!

rodrigo.constanzo · December 7, 2018, 9:57am

I got some good help on the Max forum, so I’ll post a cleaned up version of that here later too (I also want to test a 1024 channel version to see how that sounds…).

In playing with the mc. stuff more, you should definitely incorporate it into the helpfiles and general fluid.-ness as it makes multichannel file stuff so much easier. (the key is the mcs. playback objects, which allow single instances of multichannel files (as opposed to multiple instances of single channel files))

tremblap · December 7, 2018, 10:06am

On the forum, nobody will be able to use our objects, so is it really useful to post there? Or are you posting just the backbone?

tremblap · December 7, 2018, 10:07am

Max8 support will be for next year. I know you are a fan of early update, but I’ve been burnt too many times to agree

rodrigo.constanzo · December 7, 2018, 10:19am

I meant I was going to post the patch here. On the Max forum I posted the bits around the nmf stuff, so the bits I was struggling with (single instance of multichannel audio, and controlling the gain of all of those in good ways)

I think lots (most) people have Max8, of the Max crowd. Even without the new stuff, it’s loads faster than Max7 anyways, so there wouldn’t be a reason for people to not upgrade.

tremblap · December 7, 2018, 10:24am

Money? (not for me but for many users) Support to (free) (and different) Pd and SC is quite important too, so yes, Max8 integration will happen, but with a relative priority.

rodrigo.constanzo · December 7, 2018, 10:57am

Yeah, totally, but what I’m saying is that Max support = Max support (which is Max8 at the moment), as PD and SC are different environments anyways.

Most of my testing/patching will be Max8-based as it seems a lot easier for some of the things I’m trying to do at the moment, so examples I post will also be that…

tremblap · December 7, 2018, 11:02am

Until only Max8 is the sole runnable Max, this is only true for well-off updaters. Max support for this project is Max6+ i.e. 64bit Max, so it will not rely on any mc stuff in any helpfile.

You as a user can post stuff here though. After all, you are free-ish, and might convert others to your errand ways

tremblap · December 7, 2018, 3:27pm

Hello all

Here is a Max7 version, with some ‘improvements’ on what is a very cool process indeed - some sort of dirty squasher filter:

no need of script repatching since I use a ref table instead
poly instead of mc

For @rodrigo.constanzo’s pleasure, I’ve left my patching messy so he can feel the need to make it beautiful - I’ve also used the amazing index~ to annoy you all

Enjoy!

rodfilter.zip (6.1 KB)

rodrigo.constanzo · December 7, 2018, 3:43pm

Nice!

As I point of reference I pushed this a bit further but started running into some memory limits.

I was able to do 499 channels of a short (11sec) file ok, but longer than that and I couldn’t save the processed file (as float32 anyways). In my “modern” life I’ve never run into file size saving limits with audio before…

It also looks like mc. stuff tops out at 499 as I couldn’t get audio to pass with more channels than that. It’s possible I was doing something wrong however.

I wasn’t able to play with the actual filter sweeping as the way the ‘sweeping’ is currently set up uzi's the changed value, and kind of ‘lagged’ as I moved it around. Once I figure out how to do that in mc. I’ll post the MEGA “filter” patch.

tremblap · December 7, 2018, 3:51pm

I got the same limits with Max7 (and 6 and 5) trying to save large files. It is a max problem. Even more fun, sfplay~ freaks out too (which it shouldn’t)

Try my version with 499 and see which one sweats more (I’m not sure I trust poly~ to be efficient but the repatching is less dirty than scripting

rodrigo.constanzo · December 7, 2018, 4:11pm

I can’t seem to get yours to work with 499. I just get all the channels playing at once no matter what.

(and I don’t want to poke around your coll map stuff to see what the problem is)

tremblap · December 7, 2018, 4:23pm

this is the only ‘clever’ bit of my patch. It is where the problem lies as it is doing 127 mapping. I’ll try it now…

rodrigo.constanzo · December 7, 2018, 4:25pm

I changed it to 499/500, and re-banged it but it didn’t seem to work.

tremblap · December 7, 2018, 4:35pm

So I did 500 ranks, for fun. 10 iterations, to not spend the night there

2 numbers need changing in my patch:

the number of poly instances
in the scramble subpatch, the number in the uzi

Don’t forget to doubleclick the loadmess target 0box. But you will notice that you start loosing volume before you loose ‘elements’ - some of the factorisation will start to be ridiculously small components I reckon…