Using a class object as an audio parameter choice

General JUCE discussion
1

Hi, I’m trying to set an audio parameter choice for different oscillator types in a plugin to be selected. What I’m struggling with is my set of oscillator types to be chosen from are class objects from a separate oscillator header. This means I can’t use them as atomic floats using the audio parameter value tree state. Any ideas on how different classes can be used as audio parameter choices? Thank you

2

Just have each index of the choice parameter represent a different oscillator type, and create the actual oscillator object based on what index is chosen.

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3

I’d also recommend to do a conversion through the index. If you have actually different types, you can use a std::tuple. If you are talking different instances of the same type, you can use a std::array. Both shouldn’t require any runtime allocations which makes it easy to use in a realtime context.

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4

You can also use a template to determine the type based on the index, ie:

struct Sine;
struct Square;
struct Triangle;

template<std::size_t Idx>
using OscType = std::conditional_t<std::bool_constant<Idx == 0>, 
                                   Sine,
                                   std::conditional_t<std::bool_constant<Idx == 1>,
                                                      Square,
                                                      Triangle>>;
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5

I have created a class with all the parameters organized in structures, with the IDs as constexpr static and their corresponding atomics floats*. From the processor I access the floats with the class object, and from the editor I access the values with the ID and the index or instance number.

Within that class I also have my custom static methods in which the IDs are also built by concatenating the index as a string. So I only have to worry about creating the parameter or array of parameters with a common ID, when I add parameters to the array the individual ID is built automatically through the index.

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6

Thank you for all the replies, very helpful… I think indexing them first has been helpful, but I’m exploring your further suggestions as well