1 files changed, 40 insertions, 0 deletions
diff --git a/python/demos/demo_tempo.py b/python/demos/demo_tempo.py
new file mode 100755
index 0000000..51e1ae3
--- /dev/null
+++ b/python/demos/demo_tempo.py
@@ -0,0 +1,40 @@
+#! /usr/bin/env python
+
+import sys
+from aubio import tempo, source
+
+win_s = 512                 # fft size
+hop_s = win_s // 2          # hop size
+
+if len(sys.argv) < 2:
+    print("Usage: %s <filename> [samplerate]" % sys.argv[0])
+    sys.exit(1)
+
+filename = sys.argv[1]
+
+samplerate = 0
+if len( sys.argv ) > 2: samplerate = int(sys.argv[2])
+
+s = source(filename, samplerate, hop_s)
+samplerate = s.samplerate
+o = tempo("default", win_s, hop_s, samplerate)
+
+# tempo detection delay, in samples
+# default to 4 blocks delay to catch up with
+delay = 4. * hop_s
+
+# list of beats, in samples
+beats = []
+
+# total number of frames read
+total_frames = 0
+while True:
+    samples, read = s()
+    is_beat = o(samples)
+    if is_beat:
+        this_beat = int(total_frames - delay + is_beat[0] * hop_s)
+        print("%f" % (this_beat / float(samplerate)))
+        beats.append(this_beat)
+    total_frames += read
+    if read < hop_s: break
+#print len(beats)