From 1fcfca3bd900f8505712d9a0f17f87d39eb50caa Mon Sep 17 00:00:00 2001
From: Paul Brossier <piem@piem.org>
Date: Sat, 3 May 2008 22:59:47 +0200
Subject: [PATCH] src/gstaubiotempo.*: add basic computation of instantaneous
 beat period

---
 src/gstaubiotempo.c | 21 ++++++++++++++++++++-
 src/gstaubiotempo.h |  3 +++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/gstaubiotempo.c b/src/gstaubiotempo.c
index cf325f5..aa5848e 100644
--- a/src/gstaubiotempo.c
+++ b/src/gstaubiotempo.c
@@ -27,6 +27,10 @@
  * <para>
  * <programlisting>
  * gst-launch -v -m audiotestsrc ! aubiotempo ! fakesink silent=TRUE
+ * gst-launch filesrc location=file.wav ! waveparse ! audioconvert ! \
+ *      aubiotempo silent=FALSE ! audioconvert ! alsasink
+ * gst-launch filesrc location=file.mp3 ! mad ! audioconvert ! \
+ *      aubiotempo silent=FALSE ! audioconvert ! alsasink
  * </programlisting>
  * </para>
  * </refsect2>
@@ -132,6 +136,9 @@ gst_aubio_tempo_init (GstAubioTempo * filter,
   filter->hop_size = 512;
   filter->channels = 1;
 
+  filter->last_beat = -1;
+  filter->period = 0;
+
   filter->ibuf = new_fvec(filter->hop_size, filter->channels);
   filter->out = new_fvec(2,filter->channels);
   filter->t = new_aubio_tempo(filter->type_onset,
@@ -212,8 +219,20 @@ gst_aubio_tempo_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
         now += GST_FRAMES_TO_CLOCK_TIME(j, audiofilter->format.rate);
         now -= GST_FRAMES_TO_CLOCK_TIME(filter->hop_size - 1, audiofilter->format.rate);
         if (filter->silent == FALSE) {
-          g_print ("beat: %" GST_TIME_FORMAT "\n", GST_TIME_ARGS(now));
+          g_print ("beat: %" GST_TIME_FORMAT " ", GST_TIME_ARGS(now));
+        }
+
+        if (filter->last_beat != -1 && now > filter->last_beat) {
+          filter->period = 60./(now - filter->last_beat)*1.e+9;
+          if (filter->silent == FALSE) {
+            g_print ("| period: %f", filter->period);
+          }
+        }
+        if (filter->silent == FALSE) {
+          g_print ("\n");
         }
+
+        filter->last_beat = now;
       }
 
       filter->pos = -1; /* so it will be zero next j loop */
diff --git a/src/gstaubiotempo.h b/src/gstaubiotempo.h
index ce148bf..48ba927 100644
--- a/src/gstaubiotempo.h
+++ b/src/gstaubiotempo.h
@@ -64,6 +64,9 @@ struct _GstAubioTempo
   uint channels;
   uint pos;
 
+  gfloat period;
+  GstClockTime last_beat;
+
   aubio_onsetdetection_type type_onset;
 
 };
-- 
2.11.0