From c7e8efcbea13ca27f1b6f5619f05e1f79d36ba55 Mon Sep 17 00:00:00 2001
From: Jamie Bullock <jamie@jamiebullock.com>
Date: Tue, 11 Mar 2014 18:14:45 +0000
Subject: Add xtract_midicent() convenience function to convert from frequency
 to MIDI cent

---
 src/scalar.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/scalar.c')

diff --git a/src/scalar.c b/src/scalar.c
index 2e93934..4ae3f16 100644
--- a/src/scalar.c
+++ b/src/scalar.c
@@ -983,4 +983,15 @@ int xtract_wavelet_f0(const double *data, const int N, const void *argv, double
     return XTRACT_SUCCESS;
 }
 
+int xtract_midicent(const double *data, const int N, const void *argv, double *result)
+{
+    double f0 = *(double *)argv;
+    double note = 0.0;
+    
+    note = 69 + log(f0 / 440.f) * 17.31234;
+    note *= 100;
+    note = round(note);
+    
+    return XTRACT_SUCCESS;
+}
 
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