Shakeeb Alireza

chuck-max is a project to  embed the chuck engine in a Max/MSP external.

It currently has one external (chuck~) with the following features:

- Generate and process audio via an embedded chuck engine by running chuck files with `global` parameters adjusted and controlled in realtime via Max messages.

- Layer sounds by running multiple chuck files concurrently.

- Add and remove audio and audio processes on the fly via Max messages.

- Includes most of the standard ccrma chugins 

The project's repo is: https://github.com/shakfu/chuck-max

While this is not a release yet of the external itself, the repo contains all of the external's dependencies and is very straightforward to compile using the standard Max SDK build system.

PS: this is project is inspired by  Professor Brad Garton's original chuck~ external for Max 5. The chuck and Max apis have changed considerably since then, so a minimal rewrite was necessary with a view to incorporating some of the original external's features eventually.

chuck-max is a project to  embed the chuck engine in a Max/MSP external.
It currently has one external (chuck~) with the following ... 

chuck-max-a-new-project-to-develop-a-maxmsp-external-with-an-embedded-chuck-engine

chuck-max: a new project to develop a Max/MSP external with an embedded  chuck engine

110L532

I just wrote an external using libav that requires the shared ffmpeg dll's. I noticed it keeps working even after removing the additional libs from the search path. So i did a search and it turned out the viddll package comes with this files. 
Does that mean we can write cool ffmpeg externals without having to provide the shared libraries.
Is it the same on the Mac? 

EDIT: Click here to download latest version.


I just wrote an external using libav that requires the shared ffmpeg dll's. I noticed it keeps working even after removing the additional li

ffmpeg-now-part-of-max

possibly on windows, but the Mac libraries have to be loaded from the viddll.engine library so I don't think that will work.

I'm seeing dylib files with the same names. isn't it the same prinziple on Mac (xcode), linking the project with dynam. libraries and that's it? I did compile externals for Mac but I think I never had to deal with dylib files. I'm going to find that out

well, def let us know. maybe it works fine!

Some progress here:
On Windows it works fine. It's all good  if  the ffmpeg dlls are somewhere in the search path, which is granted if the VIDDLL 1.1 Package is present.

On MacOs, after I  successfully installed ffmpeg-devel package with MacPorts to get the header files, i'm adding the dylib files to the xcode project and the build succeeds.
But when external gets loaded the dylibs can't be found :
(for some reason it only reports the error for libavformat. I'm also using libavcodec and libavutil.
I don't know if that means the other 2 dylibs have been opened successfully, I assume not)

11ffload~: unable to load object bundle executable
 2017-09-20 15:59:52.917 Max[727:707] Error loading /Users/admin/Desktop/max-sdk-7.1.0/externals/11ffload~.mxo/Contents/MacOS/11ffload~:  dlopen(/Users/admin/Desktop/max-sdk-7.1.0/externals/11ffload~.mxo/Contents/MacOS/11ffload~, 262): Library not loaded: 
 @loader_path/libavformat.57.dylib
   Referenced from: /Users/admin/Desktop/max-sdk-7.1.0/externals/11ffload~.mxo/Contents/MacOS/11ffload~
   Reason: image not found

Do you know where variable @loader_path is looked up or can be set to be the viddll support folder. It seems to look inside the mxo bundle for the dylibs. Do I maybe have to use dlopen() manually in the external? Would I even find the dylibs without hardcoded path? It seems the max.app folder is not in the search path opposed to Max 7 folder on Windows. 

I really prefer a solution that refers to VIDDLLs dylibs. Don't want to bundle 30mb with an extenal, 30mb that are already present in every users Packages folder.    

I edited the binary in the mxo bundle with install_name_tool. I replace the "@loader_path" parts with absolute paths to "/Applications/Max.app/Contents/Resources/C74/packages/VIDDLL/support/libname.dylib" and IT WORKS. really, could it be so simple? (after reading endless posts, saying you can't link to a dylib outside the app bundle i'm confused)

Is it correct that the Max app path is a fixed thing on Mac and I can rely on this hardcoded path working on every Mac + Max?  

Having all applications in the Application folder is something I never liked in OSX. So on my Macs, Max is not in the Application folder, nor in ~/Applications.
And if you create standalones with you external, I guess it won't find the library.

Hmm ok thanks for the info. So the path is not reliable. 
You are right, creating a standalone is another problem where it makes no sense to link to Max app.
For now I was hoping I can make it work crossplatform in Max4Live. At least I can be sure the Max app is somewhere on disk in this environment. But i'm kinda loosing hope it will work on Mac.
If I pack the libs with mxo bundle i got a 33mb external. Is that a problem at all? 
O.  

Omg, turns out every mxo knows the location of the Max binary at runtime and can navigate relative to this location. i'm setting the pathes like this:
"@executable_path/../Resources/C74/packages/VIDDLL/support/libavcodec.dylib"
  
i didn't noticed first but that's how they find the jitter and audio framework:
@executable_path/../Frameworks/MaxAudioAPI.framework/Versions/A/MaxAudioAPI
@executable_path/../Frameworks/JitterAPI.framework/Versions/A/JitterAPI


Any news on your experiments? 
I'm using ffmpeg via shell right now, looking for a more convenient way to reas and re-encode a stream directly in max. Since I'm here, another question, is there a way in max/jitter to play an open video file?(I mean a videofile that is still been encoded). I can open a ts file with jit movie it just lets me watch what has been recorded at the time i ve opened the file. I need to reopen the file everytime I want to so see a new part of the stream.
cheers

I have a working prototype that decodes any file into a buffer~ like the "replace" message of buffer. I have not investigated into the video part of ffmpeg but that is probably what viddll and related jit externals do. 
I got a little bit lost and frustrated trying to implement a clever solution for handling big files, i mean files that exceeds buffers maximum size. 
Once i can finalize the last 5% of the external i'm happy to share it + source code. But, like i wrote above, it uses a thread to decode an audio stream to buffer~, no video involved.

Basically I think you can put any ffmpeg feature into in external. What helped a lot was to code the function in an  executeable to debug and create a working example before  moving it to an external.
Even this first step was a lot of struggle as most examples on the web are outdated if you use latest libs. 


seems really interesting. I'm looking forward to it, have fun and a nice week ;)

[beta download removed]

scr included. If this works for everybody I'll put this to my site as a download.
And HappyHalloween for all you guys ;)


very cool 11OLSEN, thanks much for sharing and congratulations on getting those libraries working for you!

Hi, 11Olsen. Great external. It's particularly useful when simultaneously dealing with audio and video/3D animation. I've done it in the past and there's some pauses in Jitter while audio is being read from disk. It really should be the standard behaviour of the loading process of buffer~ and other similar objects. 

Yes, I want to do an audiofile-browser-like thing. And a seemless prelistening function of files is not possible with the blocking behaviour of the default objects.    

I removed the beta version download. I fixed many bugs since then, some of them are critical.

Second, i noticed that when the osx external is frozen into a m4l device the "unable to load object bundle executable" - error is back. The frozen device state seems to isolate the externals from the max app ? Seems this is not finished yet. I have to dive into it again.  

As long as the m4l-Editor is not opened, the @executable_path for externals links to the Live app.
Where it finds the Max frameworks but of course not the viddll package. Ok didn't know that. 

Maybe that changes with Live 10. For now I see no other way than using @loader_path and including the dylibs in the mxo bundle. sad


Here's version 1.0: http://www.11olsen.de/code/max-objects/11ffload 

All ffmpeg dependencies are included for now. 


what happened to this external?
can i test it ? ;)


Hi Klaus,
my plan was to put it back online when i managed to recompile for Apple Silicon.


I think that external is really useful especially because it supports many codecs. I keep seeing posts from people who would like to load audio tracks from movie files. It can do that with no problem.
But I'm struggling to create a Mac version which supports intel and arm64. I'm on intel Catalina and after installing ffmpeg with homebrew, I find the files that I need:
libavcodec.dylib
libavformat.dylib
libavutil.dylib
libswresample.dylib
I can use install_name_tool to put these into the external after compiling. Now my idea is to get the arm64 versions of these files and maybe use lipo tool to join them together. But i can not even try without having access to these versions and homebrew doesn't let me install a package of another arch. 

Maybe someone using an apple silicon maschine can install ffmpeg and send files to me. Or someone has another idea. I'm trying to avoid having to universally compile ffmpeg myself it seems hard to find the files for arm64 online. 


Max ships with "Fat" versions of these libs, maybe you can make use of those?

Nice idea! I'm gonna try it. Also I found something on stackoverflow how to install a second arm-homebrew and make it install arm bottles. I'll report back.

Thanks again @Rob. Only thing i had to do was to install homebrew ffmpeg4 instead of 5 to have the correct header files. 
Would someone with an Apple Silicon machine be so kind as to confirm that it works before I make it an official download again?


i get:
11ffload~: cannot be loaded due to system security policy
i am not sure how to get around this. whith my externals i at least get a dialog about it.


Hi Klaus, thanks for testing. Here is a second take on it. This time I had Xcode automatically copy the dylibs to the bundle. If this also doesn't work it's probably a signing problem. Can you try again, please?

sorry, no good news.
i still get this same error.
even when running xattr -d com.apple.quarantine 11ffload~.mxo
the error remains.


with 11strokes eg. i get this dialog, which then solves the issue:

yes working now !!
including the dialog from above.


The buffer~ size limit seems to be obsolete. I can load complete movie 5.1 audio stream into a buffer.

I fixed another bug with some avi formats and have revived the download.

I've invested a lot of time for another update. I hope it was worth it. 

added importreplace, import and info messages

added resample, metadatadict and import-related attributes

added "channel route" argument for all messages

added ability to import from another buffer~

Since it has become quite complex now, I may have overlooked one or the other bug. Don't hesitate to contact me. DOWNLOAD HERE 

very nice!! been trying to make this work with Native Instruments Stems format which is an .mp4 container of 5 stereo tracks, but it only seems  to recognize as 2 channels.. curious if anyone has been able to  unpack the stems in Max?

OK, I see the problem. I need to put in a way to set the number of stream to use from the file instead of autoselecting it.

I updated the external, redownload and overwrite. In the new help file check out the "streams" tab. At least all stem files I have here for testing are separated correctly to 5 stereo buffers~ now.
 

yes!!! you just breathed a whole new life in the Stems format!! thank you!

11ffload~ external

Théophile Rousic-Plantec

Hi, I'm currently developing a max object with an attribute inside of it. This object take as argument an array of symbols. The problem is that I can't modify the attr value with @param on the object. Do I need to use a function at object instanciation to process the arguments ?
Thanks

Hi, I'm currently developing a max object with an attribute inside of it. This object take as argument an array of symbols. 

attributes-arguments

Attributes & arguments

Hi, I'm actually looking for a way to change the border colors on a newly created max object.
I tried to use this in the object_new function, but it doesn't seems to work. Does anyone as a clue on a way to do it ? Thanks !

object_attr_setvalueof(x, gensym("color"), 4, color);

Hi, I'm actually looking for a way to change the border colors on a newly created max object.
I tried to use this in the object_new ... 

border-color-max-object

Border color max object

twhiston

Hi, I couldn't see any examples in the 8.2 sdk of how you might add a framework to a cmake generated XCode project and hoped someone could help. 
Ideally I want to be able to put something in the CMakeLists.txt which will add frameworks, such as cocoa, to my project. I also need to link them to the binary, and in some instance have a build stage which copies them into the Frameworks destination. Has anyone done this or have enough experience with CMake to explain how to do so?

Hi, I couldn't see any examples in the 8.2 sdk of how you might add a framework to a cmake generated XCode project and hoped someone could h

adding-frameworks-to-generated-xcode-projects-using-cmake

Hey I ran into a similar issue this week and had a heck of time figuring it out. I am not experienced enough in CMake to give a step by step. However, if you look at the reply to forum post I made, I laid out the links I used to resources I used to get there as well as what worked for my situation.

https://cycling74.com/forums/mac-keystrokes-using-the-mindevkit

Hi all, 
Not sure but I think this project might help out, I worked on it as well, and got finally a swift/c++ thing working. ( RNBO )
It might nudge you in the right direction
https://cycling74.com/forums/building-gui-without-juce-for-plugins?replyPage=1#reply-644a084176fed40015cf31e9

https://github.com/ceammc/SwiftRNBO

Adding frameworks to generated xcode projects using cmake

Trevor being Trevor

This post has a lot of information to give the necessary context, but essentially I can't get the project to build when I add the code to simulate a keystroke and I am not sure why. I was able to figure this out for Windows, but I am running into a problem on Mac that I can't get past. I followed the instructions of this video and github page which seem to be the most up to date.

https://www.youtube.com/watch?v=il5WblTBUgs 
https://github.com/Cycling74/max-sdk/blob/main/README-8.2-update.md 

I started by manipulating the min.hello-world project. I removed the greeting when the object loads, edited the bang function and created a function that responds to integers. Everything compiles and works as expected. However, I want to simulate a keystroke so I brought in the following libraries...

#include <CoreGraphics/CoreGraphics.h>
#include <ApplicationServices/ApplicationServices.h>
#include <Carbon/Carbon.h>

As far as I understand, I only need Application Services, but the other ones were added as I tried to troubleshoot issues. Anyway, to use those libraries I updated my "respond to integer" function to the following code...

message<> number {this, "int", 
        MIN_FUNCTION {
            int key = 56;
            //EDIT: this code is close to correct, but definitely don't trust it.
            //there are better examples on Stack Overflow, if you are really stuck
            //comment and could share something better. Also, it appears
            //olsen put 11strokes code up on Github. It says it's cross platform, so it
            //may be a better and more comprehensive source than what I could offer.
            
            // Create an HID hardware event source
            CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
            
            // Create a new keyboard key press event
            CGEventRef evt = CGEventCreateKeyboardEvent(src, (CGKeyCode) key, true);
            
            // Post keyboard event and release
            CGEventPost (kCGHIDEventTap, evt);
            CFRelease (evt);
            CFRelease (src);
 
            //this line printed before I added the above
            cout<< "Sometimes I work, sometimes I don't" << endl;
            return {};
        }
    };

Instead of Xcode (I am not very familiar with it) I am using the terminal to build using the command "cmake --build ." inside the build folder which works great. However, the build fails once I add the keystroke specific code. This is the error given with crucial information in bold...

Undefined symbols for architecture x86_64:
"_CFRelease", referenced from:
      hello_world::number::'lambda'(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const&, int)::operator()(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const, int) const in min.hello-world.o
  "_CGEventCreateKeyboardEvent", referenced from:
      hello_world::number::'lambda'(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const&, int)::operator()(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const, int) const in min.hello-world.o
  "_CGEventPost", referenced from:
      hello_world::number::'lambda'(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const&, int)::operator()(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const, int) const in min.hello-world.o
  "_CGEventSourceCreate", referenced from:
      hello_world::number::'lambda'(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const&, int)::operator()(std::__1::vector<c74::min::atom, hello_world::number::allocator<c74::min>> const, int) const in min.hello-world.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Even though it says the issue is for x86_64 I have seen it say arm64 instead as I've tried to get things working. For that reason, I don't think the issue is specific to the architecture, but I could be wrong. Also,  Xcode intellisense autocompletes these symbols as I type them and I am able to right click and "Jump to Definition" so there is a clearly a path to these symbols, but apparently the linker or compiler is unaware of that path. To combat this (and an earlier issue), I tried updating the CMakeLists.txt for min.helloworld to the following...

# Copyright 2018 The Min-DevKit Authors. All rights reserved.
# Use of this source code is governed by the MIT License found in the License.md file.
cmake_minimum_required(VERSION 3.0)
set(C74_MIN_API_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../min-api)
include(${C74_MIN_API_DIR}/script/min-pretarget.cmake)
#############################################################
# MAX EXTERNAL
#############################################################
include_directories( 
	"${C74_INCLUDES}"
	"/System/Library/Frameworks/CoreFoundation.framework/Headers"
    	"/System/Library/Frameworks/ApplicationServices.framework/Headers"
    	"/System/Library/Frameworks/Carbon.framework/Headers" 
    	"/System/Library/Frameworks/CoreGraphics.framework/Headers"
)
set( SOURCE_FILES
	${PROJECT_NAME}.cpp
)

add_library( 
	${PROJECT_NAME} 
	MODULE
	${SOURCE_FILES}
)

target_link_libraries(  
	${PROJECT_NAME}
	"${C74_LIBS}"
	"-framework CoreFoundation" 
    	"-framework ApplicationServices"
    	"-framework Carbon"  
    	"-framework CoreGraphics"
)

include(${C74_MIN_API_DIR}/script/min-posttarget.cmake)
#############################################################
# UNIT TEST
#############################################################
include(${C74_MIN_API_DIR}/test/min-object-unittest.cmake)


Lastly, in trying to figure this out I was made aware of the 11olsen 11strokes project. That could potentially work for me, but I've already built something specific on Windows and replicating it on Mac would be much less future headache if possible. Also, learning is fun most of the time haha. 

Anyway I'm at the point where I don't know how to proceed. It's probably something simple, but this is a bit out of my element so I'm struggling to see it. Any advice or ideas are welcomed and greatly appreciated!

2021 Macbook Pro, M1 Pro, Ventura 13.3.1
cmake version 3.26.0
xcode version 14.3
max version 8.5.3
Let me know if you need anymore info!

This post has a lot of information to give the necessary context, but essentially I can't get the project to build when I add the code to ... 

mac-keystrokes-using-the-mindevkit

Following up on my own post, here's what I did to accomplish the task for those in the future. 

First, I decided to eliminate CMake and the min-devkit as variables completely and just write a basic "Command Line Tool" in Xcode to simulate a keystroke. This was a struggle and I went at the problem from many angles over a couple of days. As far I can tell, this isn't possible via C++ or Apple doesn't let any old app simulate keystrokes anymore . In hindsight, I'm thinking it's the latter. I would run my code, it would trigger Security and Privacy settings and I would allow it, but then it still not give the expected output. As far as I can tell you need to submit some kind of enhancement request now. (I tested this on Apple Silicon and Intel Based Macs by the way)
https://developer.apple.com/forums/thread/28605

Second, from my post above I was now aware of 11strokes by olsen. I downloaded it and tested it in Max, works great! That told me it was definitely possible to simulate keystrokes. In addition, I'm not sure now, but at the time I was suspicious that C++ may be part of the issue. Also I noticed 11olsen used the max-sdk instead of the min-devkit so I decided to switch to that. I am not as familiar with C so it took a little while to understand and get a customized basic object up and running. 

Once that was ready, I brought in the code to simulate a single keystroke. Immediately, I got undefined symbols error I described in my first post. At this point, I knew the problem was with CMake. I needed to manipulate the CMakeLists.txt file located under max-sdk/source/basics/myCustomExternal to make it aware of the Carbon framework I was using. This is what ended up working for me...

include(${CMAKE_CURRENT_SOURCE_DIR}/../../max-sdk-base/script/max-pretarget.cmake)
#############################################################
# MAX EXTERNAL
#############################################################
include_directories( 
	"${MAX_SDK_INCLUDES}"
	"${MAX_SDK_MSP_INCLUDES}"
	"${MAX_SDK_JIT_INCLUDES}"
	/Developer/Headers/FlatCarbon
)
FIND_LIBRARY(CARBON_LIBRARY Carbon /System/Library/Frameworks)
MARK_AS_ADVANCED (CARBON_LIBRARY)
SET(EXTRA_LIBS ${CARBON_LIBRARY})
file(GLOB PROJECT_SRC
     "*.h"
	 "*.c"
     "*.cpp"
)
add_library( 
	${PROJECT_NAME} 
	MODULE
	${PROJECT_SRC}
)
target_link_libraries(myCustomExternal(<-your project name) PRIVATE ${EXTRA_LIBS})
include(${CMAKE_CURRENT_SOURCE_DIR}/../../max-sdk-base/script/max-posttarget.cmake)


The way that CMake is implemented for the sdk would take me, a beginner, at least a few days to wrap my head around. I mostly got there by trail and error and using these sources...
https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/platform_dependent_issues/HowToUseExistingOSXFrameworks

https://stackoverflow.com/questions/2908640/how-to-add-a-framework-to-cmake

Mainly the second video in this youtube playlist
https://www.youtube.com/playlist?list=PLalVdRk2RC6o5GHu618ARWh0VO0bFlif4 

Also, the official CMake documentation and ChatGPT gave me a clue at some point. 

Lastly, something that helped me troubleshoot my CMakeLists.txt file was deleting the max-sdk/build folder's contents as I made educated guesses. Then running "cmake -G Xcode .." from the build folder in the terminal and then follow that with "cmake --build ." The first command would usually throw errors if there was something wrong with my CMakeLists.txt.

Overall, I banged my head on this problem for about a week and some of that was definitely my lack of knowledge. However, I think some extra guidance like some common basic CMake manipulations (like adding a framework in my case) would go a long way. Anyway, if this post helps you out with something like this, comment! It would be encouraging to know this helped.

Mac keystrokes using the minDevkit

GeoffMutton

Hello folks, 
I'm having a little trouble getting started with the SDK. 

The documentation talks about running a Ruby build script by using terminal to navigate into the examples folder. 

I can find neither the examples folder, or the ruby build.rb file. 

Can anyone point me in the right direction? 
Thanks!

Hello folks, 
I'm having a little trouble getting started with the SDK. 

max-sdk-8-2-0-can't-find-ruby-build-rb-or-the-examples-folder

I believe the documentation within the SDK was not updated when everything switched to cmake sometime in the last few years.

More recent build instructions are available in the readme at https://github.com/Cycling74/max-sdk.

Many thanks!

Bonus question: should I be looking at the min-devkit? 
My development skills are incredibly rusty and I've done a little C++ with Juce, so would that be a better starting point, or is SDK 8.2.0 still the 'main' way in? 


I recommend starting with the good ol’ C SDK, which (amongst other things) seems to be better documented.

been having trouble running the min-devkit on mac using the max patches(steps to repro: download/install min-devkit using package-manager, run the main patch to create or browse, all i get no matter what i do is errors similar to: "min.project: A problem occurred trying to create the new package" in the max console; running Max8.5.4 on MacOSVentura13.3.1), but i just found there's instructions on github to create from the terminal(?), maybe i'll try that instead

...would love if someone would revisit min-devkit, and create more tutorials on it(Federico Foderaro has a really great one, unfortunately, the steps don't work for me on Mac right now...), it's been rough to get into. Thanks to anyone considering this.

Max SDK 8.2.0 - can't find ruby build.rb or the examples folder

Phong Pham

Hi everyone, 

As a newcomer to Max, I attempted to create a Max external for loading a pytorch model, but unfortunately, I was not successful. I am curious if any members of this forum have accomplished this task before using the min dev-kit and pytorch C++ library, and if they would kindly share their insights on how to do it. I did follow this article to setup my project https://rvirmoors.github.io/2022/07/04/libtorch-mindevkit/  but still not be able to get pytorch to work on my Mac. Your assistance would be greatly appreciated.

Hi everyone, 

As a newcomer to Max, I attempted to create a Max external for loading a pytorch model, but unfortunately, I was not ... 

min-dev-kit-with-external-pytorch

Min dev-kit with External Pytorch

domkirke

Hello everyone!
We are currently developing the nn~ library with the min-api, that allows to embed any TorchScript model on Max/MSP in a light manner: 

https://github.com/acids-ircam/nn_tilde 

A multi-channel support would be a great add-on for the usability of our package ; unfortunately, we do not find any information/resource on how to do that with the min-api. Is this even possible and, if it is, where could we find the documentation?

Thanks a lot!
The ACIDS-IRCAM team

Hello everyone!
We are currently developing the nn~ library with the min-api, that allows to embed any TorchScript model on Max/MSP in a lig

mc-support-with-min-api-for

this helpful?
https://cycling74.com/sdk/max-sdk-8.0.3/html/chapter_mc.html 

and the examples:
https://github.com/Cycling74/max-sdk/tree/main/source/mc 

for the min-api (C++ based), i've not found much either beyond this:
https://github.com/Cycling74/min-devkit/blob/main/source/projects/mc.min.info_tilde/mc.min.info_tilde.cpp 

but this project sounds amazing, (i've only learned a bit of 'PyTorch',  facebook developer's python extension of the proper C++ based 'Torch'... very impressive as is), wishing you the best of luck!

Thank you for your answers! Unfortunately, max-sdk is not compatible with the min-api, and the given example code analyzes MC inputs but does not show how to produce ones. But thank you anyway! :)

first I am just curious - have you wrapped the object using the mc wrapper and that is not the capability you need?

We have not tried, because indeed it is not the specific purpose of what we need ; indeed (tell me if I am wrong), wrapping the external for xN channels would require to duplicate the ML model xN times right?
However, if you got any documentation on how to perform mc wrapping, it is always welcome :-)

You can access max-sdk methods by using the `max::` namespace provided by the max-sdk-base. While it may not be as "clean" as the min API, it opens up to all of the possibilities that the Max SDK offers. 

(edited to fix some typos)
@domkirke,
the information on the wrapper is here.

https://cycling74.com/sdk/max-sdk-8.2.0/chapter_mc.html

if that isn't what you need (which is sounds like you don't) I don't think there is any class in the min-api that will work as is *without* mixing the min-api and max-sdk (the non wrapper mc stuff is also explained in link above). while you certainly don't want to arbitrarily mix these two I have found that there are ways you can safely do so. Unfortunately the min-api seems to be missing some essential things and the documentation is sparse so it takes some digging through the code and asking for help.  

I was curious after seeing your question about how one could do this and I came up with a simple bit of code that seems to work to show the concept of what I think you need to do. you will note the use of the maxclass_setup  message to call things needed from the max-sdk, also the use of the C function which is getting the number of channels by accessing the chans attribute and how the minwrap casting works. there is no error checking in this and I have not tested it extensively but see if it makes sense.  also note multichannelsignal on the outlet definition

#include "c74_min.h"

using namespace c74::min;



long simplemc_multichanneloutputs(c74::max::t_object* x, long index, long count);

class simplemc_tilde : public object<simplemc_tilde>, public vector_operator<> {
public:
    MIN_DESCRIPTION		{ "simple out" };
    MIN_TAGS			{ "misc" };
    MIN_AUTHOR			{ "anonymous" };
    MIN_RELATED			{ "cycle~" };

    inlet<>  m_inlet 			{ this, "messages" };
    outlet<> m_outlet		{ this, "(multichannelsignal) output", "multichannelsignal" };
    
    attribute<int> chans {this, "chans", 1,
        range { 1, 1024 }
        
    };

    void operator()(audio_bundle input, audio_bundle output) {
        
        for (auto i = 0; i < output.frame_count(); ++i) {
            
            for (auto channel = 0; channel < output.channel_count(); ++channel) {
                auto    out  = output.samples();
                out[channel][i] = channel; // will just outputs channel number 
            }


        }
    }
    
    message<> maxclass_setup {this, "maxclass_setup",
        MIN_FUNCTION {
            c74::max::t_class* c = args[0];
            c74::max::class_addmethod(c, (c74::max::method)simplemc_multichanneloutputs, "multichanneloutputs", c74::max::A_CANT, 0);

            return {};
        }
    };

};

MIN_EXTERNAL(simplemc_tilde);



long simplemc_multichanneloutputs(c74::max::t_object* x, long index, long count) {
    minwrap<simplemc_tilde>* ob = (minwrap<simplemc_tilde>*)(x);
    return ob->m_min_object.chans;
}

Hello Testcase!
Thank you so much for you answer. Indeed, this seems to be an interesting solution, we'll investigate that next week and we'll post here how it came :-)

Just used this approach to automatically sync the number of output channels to the number of input channels my external receives. Works like a charm. 

It's important to note, that the chans variable from the example above NEEDS to be of type min::attribute<int> and can't just be a long, even though that's the return type of thelong simplemc_multichanneloutputs () function. When I tried just using a long class member max crashed... 

Hello folks!
We managed to develop a mc~ support thanks to your advices, everything is here : 
https://github.com/acids-ircam/nn_tilde 

Hope that could help people wanting to develop mc support with the min-api. Thank you so much ! 

This forum post has been very useful in getting me started, but I am having an issue just passing a multichannel signal through an external. I am quite new to authoring externals and it is likely I am doing something silly. The external adapts to an incoming mc signal fine, but it has issues reading the input channel and outputting it. I was indexing via the output channel before and it was crashing max and when  I index from the input channel it does not pass the values correctly.  I attached my cpp file and here is the code for the operator function.
void operator()(audio_bundle input, audio_bundle output) {

void operator()(audio_bundle input, audio_bundle output) {

        for (auto i = 0; i < input.frame_count(); ++i) {
            
            for (auto channel = 0; channel < input.channel_count(); ++channel) {
                output.samples(channel)[i] = input.samples(channel)[i];
            }
        }
    }

Hello Christopher! I don't know if you fixed the issue or not, but it could be helpful to print the number of channels / inputs / bundle size, you may ask for a channel that does not exist. Our code is here, if it could bring you some interesting insights! Cheers

@BENEDIKT.SAILER  Hi, it's been a while since this thread was posted but I was wondering if you could clarify how you adapted Testcase's code to sync the number of output channels to the number of input channels?

mc support with min-api for 

Iain Duncan

Hi devs, I'm wondering if anyone can tell me if there is a way in C SDK to do the equivalent of sending a message a named receive by using the semicolon in a message box. 

Hi devs, I'm wondering if anyone can tell me if there is a way in C SDK to do the equivalent of sending a message a named receive by using ... 

sdk-version-of-sending-a-message-to-a-receive-object

or alternatively/additionally, to find a receive object in the patcher with a #0_foobar name? 

Hi, IAIN, look here at the "forward" function.  

Ah great, thanks! Luigi and Eric are the answer AGAIN. lol. :-)

Cycling '74 Forums

chuck-max is a project to embed the chuck engine in a Max/MSP external. It currently has one external (chuck~) with the following ...

yes!!! you just breathed a whole new life in the Stems format!! thank you!

Hi, I'm currently developing a max object with an attribute inside of it. This object take as argument an array of symbols.

Hi, I'm actually looking for a way to change the border colors on a newly created max object. I tried to use this in the object_new ...

Hi all, Not sure but I think this project might help out, I worked on it as well, and got finally a swift/c++ thing working.

Following up on my own post, here's what I did to accomplish the task for those in the future.

Cool - good to know.

Hi everyone, As a newcomer to Max, I attempted to create a Max external for loading a pytorch model, but unfortunately, I was not ...

@BENEDIKT.SAILER Hi, it's been a while since this thread was posted but I was wondering if you could clarify how you adapted Testcase's ...

Ah great, thanks! Luigi and Eric are the answer AGAIN. lol. :-)