shithub: aubio

Download patch

ref: 75ad1693954bbf7c2f699e9a5e4d55ad032322b8
parent: 5507e9d32a4a5547d924d71258f2ed77b356dbe3
parent: 3bcaf9c80699d0c5d324d90d441bd0570f111218
author: Paul Brossier <piem@piem.org>
date: Wed Apr 18 07:38:26 EDT 2007

merge from pomme branch

--- a/INSTALL
+++ /dev/null
@@ -1,229 +1,0 @@
-Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002 Free Software
-Foundation, Inc.
-
-   This file is free documentation; the Free Software Foundation gives
-unlimited permission to copy, distribute and modify it.
-
-Basic Installation
-==================
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-     ./configure CC=/usr/local2/bin/gcc
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-overridden in the site shell script).
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-======================
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-operates.
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--- a/src/mathutils.c
+++ b/src/mathutils.c
@@ -457,6 +457,19 @@
   return zcr/(smpl_t)input->length;
 }
 
+smpl_t aubio_spectral_centroid(cvec_t * spectrum, smpl_t samplerate) {
+  uint_t i=0, j;
+  smpl_t sum = 0., sc = 0.;
+  for ( j = 0; j < spectrum->length; j++ ) {
+    sum += spectrum->norm[i][j];
+  }
+  if (sum == 0.) return 0.;
+  for ( j = 0; j < spectrum->length; j++ ) {
+    sc += (smpl_t)j * spectrum->norm[i][j];
+  }
+  return sc / sum * samplerate / (smpl_t)(spectrum->length);
+}
+
 void aubio_autocorr(fvec_t * input, fvec_t * output){
         uint_t i = 0, j = 0, length = input->length;
         smpl_t * data = input->data[0];
--- a/src/mathutils.h
+++ b/src/mathutils.h
@@ -208,6 +208,10 @@
  */
 smpl_t aubio_zero_crossing_rate(fvec_t * input);
 /**
+ * spectrum centroid computed on a cvec
+ */
+smpl_t aubio_spectral_centroid(cvec_t * input, smpl_t samplerate);
+/**
  * clean up cached memory at the end of program
  *
  * use this function at the end of programs to purge all
--- a/swig/aubio.i
+++ b/swig/aubio.i
@@ -146,6 +146,7 @@
 smpl_t aubio_level_detection(fvec_t * ibuf, smpl_t threshold);
 void aubio_autocorr(fvec_t * in, fvec_t * acf);
 smpl_t aubio_zero_crossing_rate(fvec_t * input);
+smpl_t aubio_spectral_centroid(cvec_t * spectrum, smpl_t samplerate);
 
 /* scale */
 extern aubio_scale_t * new_aubio_scale(smpl_t flow, smpl_t fhig, smpl_t ilow, smpl_t ihig	);