/*
 * Reduces ringing artifacts from a sample
 * after backwards Fourier transform. (The
 * outcome doesn't actually sound very nice,
 * though.)
 */

void
eliminate_ringing (float *data, uint32_t nframes)
{
	uint32_t i;
	float x, *x2, x3;

	for (i = 0; i < nframes; ++i)
	{
		x = data[i];

		if (i + 2 < nframes)
		{
			x2 = &data[i + 1];
			x3 = data[i + 2];
		}
		else if (i + 1 < nframes)
		{
			x2 = &data[i + 1];
			x3 = data[0];
		}
		else
		{
			x2 = &data[0];
			x3 = data[1];
		}

		if (x <= *x2)
		{
			if (*x2 > x3)
			{
				*x2 = x;
			}
		}
		else if (*x2 < x3)
		{
			*x2 = x;
		}
	}
}