From b418fb91e7bb45d7b5f1eb8b19703441ae94eb13 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Thu, 9 Feb 2006 16:18:39 +0000
Subject: got everything building and working, including building
 single-object/single-file objects with a shared dylib.  Now got to get it
 integrated into the build system

svn path=/trunk/externals/fftease/; revision=4574
---
 lib/fold.c | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 lib/fold.c

(limited to 'lib/fold.c')

diff --git a/lib/fold.c b/lib/fold.c
new file mode 100644
index 0000000..0523d28
--- /dev/null
+++ b/lib/fold.c
@@ -0,0 +1 @@
+#include "fftease.h"

/*
 * multiply current input I by window W (both of length Nw);
 * using modulus arithmetic, fold and rotate windowed input
 * into output array O of (FFT) length N according to current
 * input time n
 */
void fold( float *I, float *W, int Nw, float *O, int N, int n )

{
 
    int i;

    for ( i = 0; i < N; i++ )
	O[i] = 0.;

    while ( n < 0 )
      	n += N;
    n %= N;
    for ( i = 0; i < Nw; i++ ) {
	      O[n] += I[i]*W[i];
      	if ( ++n == N )
	      n = 0;
    }
}

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