What to include in separate cpp/hpp file to be able to use "args.sampleRate"?

Development
1

Hey :slight_smile:

Been working on moving some functions, to a separate cpp file and got a basic test working. So I know I got the basic setup right and how to implement the function for separate cpp file.

Then I wanted to implement the actual function I’d like to use, but when I use args.sampleRate in my functions.cpp file, it says " args. error undeclared identifier".

What do I need to include in either my functions.cpp or functions.hpp files, to make it work?

Thanks in advance!

2

args is an argument of the Module::process() method which you override in your Module subclass. The Rack plugin API likely already included in your source code as rack.hpp.

3

Thanks for responding :slight_smile:

Hmmm, okay. Strange its not working. Yes I have set up the development environment and been using it for a week or so, with no issues. And the code works when I use it directly in my modules.

In plugin.hpp I have this at the top: Screenshot 2024-02-12 at 23.09.42

In plugin.cpp: Screenshot 2024-02-12 at 23.20.57

In function.hpp, I declare the function, nothing else in there; Screenshot 2024-02-12 at 23.10.34

In functions.cpp I have code: Screenshot 2024-02-12 at 23.12.07

The error I get: error: use of undeclared identifier ‘args’

I did try to add #include <rack.hpp>, along with using namespace rack to both functions.cpp and functions.hpp, with no luck.

Not really sure whats wrong I tried a few things now and I am stuck.

Any help appreciated :wink:

4

args is an argument to the process() function. I do not think you are in your process() function in your code.l

5

Just a general suggestion, when I was first learning how to develop plugins and modules, I found it invaluable to download a number of open source plugins’ code from GitHub in order to see what functioning code looks like.

1 Like
6

I have made some modules a few years ago, just quit it for a while. I am not a programmer, but I have made a bunch of modules before :wink:

I do also have a bunch of modules to look at, but none of the ones I have has functions in separate cpp files. If you can recommend some, Ill gladly look at them. I did make a basic function that works, as I mentioned.

No I am in a separate cpp file. So that makes sense. Is there any way to use the args.sampleRate, or to get the sample rate outside of the process block?

I did also try to add the #include <samplerate.h> to the functions.cpp and functions.hpp files. That didn’t work either.

Anyway, it’s not something that can’t be done without the samplerate, but I just like to be able to use it for timing related stuff, like for a button, that I would like to turn on and off for 0,5 seconds. It just seemed rational to use the samplerate for that, so it’s consistent, no matter what samplerate you use.

7

float sr=APP->engine->getSampleRate();

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8

Thanks :slight_smile:

At least it builds now. I had to add #include <rack.hpp> to the functions.cpp file, though, then it worked.

But the function doesnt behave as it does when just made in process block. It uses a counter, which I don’t think works correctly after it has been moved out of process block…

Anyway, one more hurdle over come. Think I am going to leave it for a bit and just do it in the process block and then go on with other stuff and get back to it in a few days.

I appreciate the input!

9

I’d recommend propagating the sampleRate or sampleTime from your Module::process() method to your DSP classes and functions, instead of calling a Rack function from your DSP code. This makes your DSP code isolated from Rack functions and allows the compiler to better inline your code.

2 Likes
10

Thanks Andrew :slight_smile:

But how would I go about doing that?

11

The way I do this is to pass the args pointer to my DSP function as the first argument in the DSP function.

1 Like
12

Thats a good idea :wink:

Thank you for the suggestion, I will try that!