From 416c0b567ac0c973c4cc1bf272d37046cc1ccdb7 Mon Sep 17 00:00:00 2001
From: Paul Brossier <piem@piem.org>
Date: Thu, 6 Sep 2007 18:01:41 +0200
Subject: [PATCH] beattracking.{h,c}: add function aubio_beattracking_get_bpm
 to return the observed tempo at any moment

---
 src/beattracking.c | 8 ++++++++
 src/beattracking.h | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/beattracking.c b/src/beattracking.c
index d902e272..6d30ee07 100644
--- a/src/beattracking.c
+++ b/src/beattracking.c
@@ -452,3 +452,11 @@ void aubio_beattracking_checkstate(aubio_beattracking_t * bt) {
         bt->rp2 = rp2;
 
 }
+
+smpl_t aubio_beattracking_get_bpm(aubio_beattracking_t * bt) {
+        if (bt->timesig != 0 && bt->counter == 0 && bt->flagstep == 0) {
+          return 5168. / (smpl_t)bt->gp;
+        } else {
+          return 0.;
+        }
+}
diff --git a/src/beattracking.h b/src/beattracking.h
index 05309c82..78da1fcd 100644
--- a/src/beattracking.h
+++ b/src/beattracking.h
@@ -59,6 +59,15 @@ aubio_beattracking_t * new_aubio_beattracking(uint_t winlen, uint_t channels);
 
 */
 void aubio_beattracking_do(aubio_beattracking_t * bt, fvec_t * dfframes, fvec_t * out);
+/** get current tempo in bpm
+
+  \param bt beat tracking object
+
+  Returns the currently observed tempo, in beats per minutes, or 0 if no
+  consistent value is found.
+
+*/
+smpl_t aubio_beattracking_get_bpm(aubio_beattracking_t * bt);
 /** delete beat tracking object
 
   \param p beat tracking object
-- 
2.26.2