3DTI-cross-platform/StereoSpread.cpp at master · reactify/3DTI-cross-platform · GitHub

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//
//  Created by Ragnar Hrafnkelsson on 01/11/2015.
//  Copyright © 2015 Reactify. All rights reserved.
//

#include "StereoSpread.h"

StereoSpread::StereoSpread() : width(1.f)
{
	printf("StereoSpread Loaded \n");
}

StereoSpread::~StereoSpread()
{

}

void StereoSpread::setWidth(float w)
{
	if (w < 0.f) w = 0.f; if (w > 1.f) w = 1.f;
	width = w;
	printf("Set Width: %f \n", width);
}

// http://musicdsp.org/showArchiveComment.php?ArchiveID=256
void StereoSpread::process(float **inBuffers, float **outBuffers, const int bufferSize)
{
	// calculate scale coefficient
	float coef_S = width * 0.5f;

	float* inLeft = inBuffers[0];
	float* inRight = inBuffers[1];
	float* outLeft = outBuffers[0];
	float* outRight = outBuffers[1];

	for (int i = 0; i < bufferSize; i++)
	{
		float m = (inLeft[i] + inRight[i]) * 0.5f;
		float s = (inRight[i] - inLeft[i]) * coef_S;

		outLeft[i] = m - s;
		outRight[i] = m + s;
	}
}

void StereoSpread::process_inline(float *inBuffer, float *outBuffer, const int bufferSize)
{
	// calculate scale coefficient
	float coef_S = width * 0.5f;

	for (int i = 0; i < bufferSize * 2; i++)
	{
		float m = (inBuffer[i] + inBuffer[i + bufferSize]) * 0.5f;
		float s = (inBuffer[i + bufferSize] - inBuffer[i]) * coef_S;

		outBuffer[i] = m - s;
		outBuffer[i + bufferSize] = m + s;
	}
}