From: Eduard Müller <mueller.eduard@googlemail.com>
Date: Sat, 29 Jul 2017 20:11:52 +0000 (+0200)
Subject: Revert ooura reverse fft scaling changes
X-Git-Tag: 0.4.6~6^2~14^2~1
X-Git-Url: https://git.aubio.org/?a=commitdiff_plain;h=7100895117717f9721a73937fa3871d41ea82a2e;p=aubio.git

Revert ooura reverse fft scaling changes

... and adjusted new Intel IPP fft impls scaling accordingly as well
---

diff --git a/src/spectral/fft.c b/src/spectral/fft.c
index 13411fd2..1c2f80ba 100644
--- a/src/spectral/fft.c
+++ b/src/spectral/fft.c
@@ -449,16 +449,16 @@ void aubio_fft_rdo_complex(aubio_fft_t * s, const fvec_t * compspec, fvec_t * ou
   // apply fft
   ippsFFTInv_CCSToR_64f((const Ipp64f *)s->complexOut, output->data, s->fftSpec, s->memBuffer);
   // apply scaling
-  ippsMulC_64f(output->data, 1.0 / s->winsize, output->data, s->fft_size);
+  ippsMulC_64f(output->data, 2.0 / s->winsize, output->data, s->fft_size);
 #else
   // apply fft
   ippsFFTInv_CCSToR_32f((const Ipp32f *)s->complexOut, output->data, s->fftSpec, s->memBuffer);
   // apply scaling
-  ippsMulC_32f(output->data, 1.0f / s->winsize, output->data, s->fft_size);
+  ippsMulC_32f(output->data, 2.0f / s->winsize, output->data, s->fft_size);
 #endif /* HAVE_AUBIO_DOUBLE */
 
 #else                         // using OOURA
-  smpl_t scale = 1.0 / s->winsize;
+  smpl_t scale = 2.0 / s->winsize;
   s->out[0] = compspec->data[0];
   s->out[1] = compspec->data[s->winsize / 2];
   for (i = 1; i < s->fft_size - 1; i++) {