From b418fb91e7bb45d7b5f1eb8b19703441ae94eb13 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner 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/leanunconvert.c | 1 + 1 file changed, 1 insertion(+) create mode 100644 lib/leanunconvert.c (limited to 'lib/leanunconvert.c') diff --git a/lib/leanunconvert.c b/lib/leanunconvert.c new file mode 100644 index 0000000..4880729 --- /dev/null +++ b/lib/leanunconvert.c @@ -0,0 +1 @@ +#include "fftease.h" /* unconvert essentially undoes what convert does, i.e., it turns N2+1 PAIRS of amplitude and frequency values in C into N2 PAIR of complex spectrum data (in rfft format) in output array S; sampling rate R and interpolation factor I are used to recompute phase values from frequencies */ void leanunconvert( float *C, float *S, int N2 ) { double cos(), sin(); int real, imag, amp, phase; register int i; for ( i = 0; i <= N2; i++ ) { imag = phase = ( real = amp = i<<1 ) + 1; S[real] = *(C+amp) * cos( *(C+phase) ); if ( i != N2 ) S[imag] = -*(C+amp) * sin( *(C+phase) ); } } \ No newline at end of file -- cgit v1.2.1