Meridel

Centre and sides, set apart.

Mid/side mixer: set the centre and the sides separately, spread or narrow the image, and turn the whole image left or right without losing energy. Decode mode takes a mid/side recording in; encode mode sends mid/side out.

◆ Paidorg.sournd.utility.meridel

Hear it

Every parameter plays here, rendered on our server. Pick a test sound or your own file, move the dials or press Randomise, and switch bypass to compare.

Details

Engine id: org.sournd.utility.meridel
Category: Utility
Type: Mid side, width
Licence: £2.99 once, or in the subscription
Version: 1.0.0
Parameters: 5
Latency: none
Tail: 0 s
Sidechain input: no
Channels: mono or stereo

Parameters

The id is the C ABI parameter id and the JUCE parameter id (as a decimal string).

Id	Key	Name	Min	Max	Default	Unit	Taper
0	`mode`	Mode (stereo, decode M/S, encode M/S)	0	2	0	-	linear
1	`mid_db`	Mid	-24	12	0	dB	linear
2	`side_db`	Side	-24	12	0	dB	linear
3	`width_pct`	Spread	0	200	100	%	linear
4	`direction_deg`	Direction	-45	45	0	deg	linear

How it is made

Original sOURnd utility blending general techniques: sum/difference mid/side matrixing, independent mid and side gains, side scaling for width, and an energy-preserving rotation of the left/right vector.

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CMake

cmake

juce_add_module(path/to/sournd_engine)
target_include_directories(MyPlugin PRIVATE path/to/include)
target_link_libraries(MyPlugin PRIVATE sournd_engine path/to/libsournd_cabi.a)

Three lines. Full steps: JUCE quick start.

C++ (JUCE)

cpp

#include <sournd_engine/sournd_engine.h>

sournd::SourndEngine engine { "org.sournd.utility.meridel" };
juce::AudioProcessorValueTreeState parameters { *this, nullptr, "Parameters",
    sournd::SourndEngineParameters::createLayout (engine) };
sournd::SourndEngineParameters bridge { engine, parameters };

// prepareToPlay
engine.prepare ({ sampleRate, (juce::uint32) maximumBlock, 2 });
bridge.prepare (sampleRate);
setLatencySamples ((int) engine.latency());

// processBlock
bridge.apply ((uint32_t) buffer.getNumSamples());
juce::dsp::AudioBlock<float> block { buffer };
engine.process (juce::dsp::ProcessContextReplacing<float> { block });

// get/setStateInformation: hold getCallbackLock() around saveState / loadState,
// so state work never overlaps processBlock (full example: /docs/juce/)

Plain C

sournd_engine *e = NULL;
if (sournd_engine_create("org.sournd.utility.meridel", &e) == SOURND_OK) {
    sournd_engine_prepare(e, 48000.0, 512);
    sournd_engine_set_param(e, 0, 0); /* Mode (stereo, decode M/S, encode M/S) */
    sournd_engine_process(e, in, out, 2, frames);
    sournd_engine_destroy(e);
}

Ask your AI

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Prompt

Add the sournd engine org.sournd.utility.meridel to my JUCE plugin. Follow https://sournd.com/docs/juce/index.md
and the engine reference at https://sournd.com/engines/meridel/index.md. Expose every parameter through APVTS.