Force mono node?

[Orvillain]

Sometimes you know that you definitely want a node to only process in mono.

So if I do:

static constexpr int getFixChannelAmount() { return 1; };

And then later on:

template <typename T> void process(T& data)
		template <typename T> void process(T& data)
		{
			auto& fd = data.template as<ProcessData<getFixChannelAmount()>>();
			auto block = fd.toAudioBlock();
			auto* left = block.getChannelPointer(0);
            auto* right = block.getChannelPointer(1);
			numSamples = data.getNumSamples();
			
			// change "effect" object to StereoAudioEffect
			// and switch to this if stereo
			//effect.process(left, right, numSamples);

			// change "effect" object to MonoAudioEffect
			// and switch to this if mono
			//effect.process(left, numSamples);
			
		}

I would have two separate effect processor classes; MonoAudioEffect and StereoAudioEffect. Essentially wrappers around some child DSP objects.

Is this a legal approach to effectively switching between mono versus stereo processing? Should I be copying the left channel to the right channel to make things consistent with the rest of scriptnode?

[Christoph Hart]

Not sure I understand, where do you do the switch? And why do you want to switch if you know that a node is only processing a single channel?

If you're node is known to be mono, then just process the first channel in the implementation, or if you want to force a generic node to only process the first channel, you can use the wrap::fix template to force mono processing.

// instead of this member declaration
MyClass obj;

// use
wrap::fix<1, MyClass> obj;

Your code is probably throwing an assertion at auto* right = block.getChannelPointer(1); if you have created the audio block from a single channel process data object.

[Orvillain]

@Christoph-Hart said in Force mono node?:

Not sure I understand, where do you do the switch? And why do you want to switch if you know that a node is only processing a single channel?

If you're node is known to be mono, then just process the first channel in the implementation, or if you want to force a generic node to only process the first channel, you can use the wrap::fix template to force mono processing.

// instead of this member declaration
MyClass obj;

// use
wrap::fix<1, MyClass> obj;

Your code is probably throwing an assertion at auto* right = block.getChannelPointer(1); if you have created the audio block from a single channel process data object.

I was thinking in situations where I want to do a tubescreamer emulation, for example. I don't want true stereo processing.

But maybe I'm overthinking it, and I just do a stereo node... collapse the channels... process the result... write the result back to output left and output right, with some gain compensation?