""

svn path=/trunk/; revision=325

1 files changed, 17 insertions, 0 deletions

diff --git a/externals/grill/fftease/src/overlapadd.c b/externals/grill/fftease/src/overlapadd.c
new file mode 100644
index 00000000..7e832a00
--- /dev/null
+++ b/externals/grill/fftease/src/overlapadd.c
@@ -0,0 +1,17 @@
+/*
+ * input I is a folded spectrum of length N; output O and
+ * synthesis window W are of length Nw--overlap-add windowed,
+ * unrotated, unfolded input data into output O
+ */
+void overlapadd( float *I, int N, float *W, float *O, int Nw, int n )
+{
+ int i ;
+    while ( n < 0 )
+	n += N ;
+    n %= N ;
+    for ( i = 0 ; i < Nw ; i++ ) {
+	O[i] += I[n]*W[i] ;
+	if ( ++n == N )
+	    n = 0 ;
+    }
+}