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Connector

I still did not get an answer to my question so i try to edit my original post for better understanding and reproducing my Problem to hopefully some hints to my issue:

I am writing an jitter external for Max 9.0.8 with max-sdk-8.2.0:

max.testexternal.c.txt

testexternal.c.txt

Inside the external i am filling a 2x2x3 matrix and storing the matrix to brightnessTest.jxf in the Filesystem. After reading back into a matrix object i want to get the stored Values back in a jitter Patch. 

Testexternal.maxpat

 While storing the values to the matrix with this code: 

for (x->currentframe = 0; x->currentframe < 3; x->currentframe++) {
    for (i = 0; i < x->nrOfCells; i++) {
        yCellPos = i / x->cols;
        xCellPos = i % x->cols;

        brightness = 25. * i;
        post("i: %ld", i);
        post("x->currentframe: %ld, xPos: %ld, yPos: %ld", x->currentframe, xCellPos, yCellPos);
        post("brightness: %f", brightness);

        brightnessp = brightness_bp  
            + xCellPos * sizeof(float) 
            + yCellPos * sizeof(float) * (&brightness_minfo)->dim[0]
            + x->currentframe * sizeof(float) * (&brightness_minfo)->dim[0] * (&brightness_minfo)->dim[1];
        *brightnessp = brightness;

    }
}

The output to console looks fine (frames 0,1,2 are filled with values):

But when i try to read back the matrix values in the patch

it seems that only the first frame (frames 0) was read back correctly. At the second frame (frames 1) i only get 0. Values and the third frame (frames 2) i get no Values.

Hope anyone could give me a hint to solve my problem. 

I still did not get an answer to my question so i try to edit my original post for better understanding and reproducing my Problem to...

problem-with-writing-a-matrix-to-jxf-file-and-reading-it-back-to-jitter

Problem with writing a matrix to jxf File and reading it back to Jitter

David Landon

I'm working on writing an external that sends max audio signal over the internet, via UDP, directly from Max/MSP. I'm using Libuv for asynchronous I/O in an effort to reduce latency.

My question is this: how can I copy the entire signal vector at once, into a buffer that I can then send. I've reviewed the original Olaf Matthes netsend~ code and then the same netsend~ as updated by Remu and Oliver Guillerminet, and they use the old style performance methods where t_signal **sp is passed to the method and then the signal vector can be grabbed from sp->s_vec.

The new dsp64 process uses double, I know. And I _believe_ that it is a double pointer to another pointer that is an array of the samples, but without access to the code that passes variables into that routine, I'm fumbling around, not really knowing what's going on "under the hood". Does anybody have any insight into how to do this?

At this point, my best guess would be to hop into the perform64 method, and do something to the effect of:

memcpy(my_vector, inL , sizeof(maxvectorsize))???

Thoughts? Ideas? Any help would be GREATLY appreciated!

* As an aside: I know that audio over internet can be done using TCP via jit.catch and then jit.net.send. Though, my goal is to see what would happen if i were to forgo quality as a means of minimizing latency. The C74 post describing the above mentioned process mentions not seeing any performance gains using UDP (wouldn't it be sooooo nice if they would release that code anyway?), but I'm wondering if there's a point, with super small vector sizes, that serious, synchronized live performance could be had, even if some packets are lost in transport.

Hi All,
I'm working on writing an external that sends max audio signal over the internet, via UDP, directly from Max/MSP.  I'm using Libuv f

pass-entire-signal-vector-to-buffer-t_signal-what-is-double-**ins-pointing-to

Pass entire signal vector to buffer? t_signal? What is double **ins pointing to?

I am trying to write an jitter external for Max 9 with Max 8.2 SDK. I have the problem that Max does crash when i use my external in a patch and i do not really know why? 

So is there a way to debug the external? 

Or is it possible to write some information from the jitter object or wrapper to the max console with a print method or something similar?

Or are there any log files where i can find some information about the reason for crashing max?

Hi,

I am trying to write an jitter external for Max 9 with Max 8.2 SDK. I have the problem that Max does crash when i use my external in a...

jitter-c-external-debugging

Jitter c external debugging

Jan M

To brush up a bit my C++ knowledge and out of curiosity I started to dip my toes into the Min-Devkit.

As a starting project I chose to work on a new implementation of an object to connect to the ENTTEC DMX USB Pro, because it has a simple serial API and offers some interesting possibilities like multithreading, concurrency etc. One object I am working on is called [jam.dmxusbpro].

As part of the project I want to allow only one instance of  [jam.dmxusbpro] to be able to open a serial port to an  ENTTEC DMX USB Pro. 

The way implemented this is by creating a separate device manager class - a singleton - that tracks which devices are opened by which instance of  [jam.dmxusbpro] . That works fine between objects off the same class.

As a second step I am creating another object, called  [jam.dmxusbpro~] that allows to control DMX channels with MSP signals.

However, my approach of using a singleton device manager class only works within instances of the same Max object not between  [jam.dmxusbpro] and   [jam.dmxusbpro~].

Is there a way to share data between different Max objects using the Min-DevKit?

PS: I am working on MacOS and am using the POSIX termios API to open the serial ports.

PPS: Min-DevKit is a great addition!! It got me started very fast and is easily accessible for me who's working more in other languages and has a quite basic experience with C and C++.

To brush up a bit my C++ knowledge and out of curiosity I started to dip my toes into the Min-Devkit.

As a starting project I chose to...

min-devkit-sharing-data-between-objects

Min-DevKit sharing data between objects

i want to prepare my Laptop and GitHub repository for developing c-externals with Max 8.2 SDK, Visual Studio 2022 and CMAKE 3.23.0 for Max 9.0.4. on Windows 10. Therefor i want to clear some points:

I have cloned the max-sdk in my Max 9 Packages Folder like it is described at 

https://github.com/Cycling74/max-sdk/blob/main/README.md

For developing my own c-externals i want to copy and rename existing source code from the 

 folder as a starting Point for modifying the code for my needs. 

After finishing the external I want to push my own c-external Code to my own private GitHub Repository.

But I don't really know how to implement that because the 

Hope you can help me with thesse Questions!

Hi there,

i want to prepare my Laptop and GitHub repository for developing c-externals with Max 8.2 SDK, Visual Studio 2022 and CMAKE...

handling-github-repositories-for-max-sdk-c-externals

Handling GitHub repositories for max-sdk c-externals

I just started working with the min-devkit a little bit and I am running into a weird crash I don't quite understand (see code snippet below).  I am on Sequoia 15.1.1 on a 2023 M3 using Max 8.6.5.

If I send something out an outlet, starting with a string followed by a single number (e.g. float), that works. Anything else seems to cause a crash.

What I am trying to do is add a string before a list of floats so I can use [route] in max to further process the output.

Furthermore, when I use a string followed by atoms 

No matching member function for call to 'push_back'

referring me to c74_min_outlet.h line 282

 // utility: queue an argument of any type for output
    template <typename argument_type>
    void queue_argument(const argument_type& arg) noexcept
    {
        m_accumulated_output.push_back(arg);
    }


 to add a value to the end of it. However, if I look at the type of m_accumulated_output it is of type 

If I go to c74_min_atom.h it clearly states on line 319 that:

// We don't own the array of atoms, so we cannot do these operations:
    // insert
    // erase
    // push_back
    // push_front
    // pop_front
    // pop_back

I might have a fundamental misunderstanding here, but it looks like that if we deal with atoms we can't use 

, but in queue_argument() from c74_min_outlet.h (line 282) we clearly use .push_back() to try to add something to 

So, long story short: what is the correct way of sending something like:

std::vector<float> data = {....};
std::string routing = "data";

to_outlet.send(routing, data);

Dev Forum