From a19a216bc60160c162e616145ef091dd18ce4e61 Mon Sep 17 00:00:00 2001
From: Skip Montanaro <skip.montanaro@gmail.com>
Date: Tue, 16 Feb 2021 14:40:46 -0600
Subject: Python 0.9.1 as posted in alt.sources

---
 lib/Soundogram.py | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 lib/Soundogram.py

(limited to 'lib/Soundogram.py')

diff --git a/lib/Soundogram.py b/lib/Soundogram.py
new file mode 100644
index 0000000..38dd5ef
--- /dev/null
+++ b/lib/Soundogram.py
@@ -0,0 +1,36 @@
+# Module 'Soundogram'
+
+import audio
+from Histogram import Histogram
+
+class Soundogram() = Histogram():
+ #
+ def define(self, (win, chunk)):
+ width, height = corner = win.getwinsize()
+ bounds = (0, 0), corner
+ self.chunk = chunk
+ self.step = (len(chunk)-1)/(width/2+1) + 1
+ ydata = _make_ydata(chunk, self.step)
+ return Histogram.define(self, (win, bounds, ydata, (0, 128)))
+ #
+ def setchunk(self, chunk):
+ self.chunk = chunk
+ self.recompute()
+ #
+ def recompute(self):
+ (left, top), (right, bottom) = self.bounds
+ width = right - left
+ self.step = (len(chunk)-1)/width + 1
+ ydata = _make_ydata(chunk, self.step)
+ self.setdata(ydata, (0, 128))
+ #
+
+
+def _make_ydata(chunk, step):
+ ydata = []
+ for i in range(0, len(chunk), step):
+ piece = audio.chr2num(chunk[i:i+step])
+ mi, ma = min(piece), max(piece)
+ y = max(abs(mi), abs(ma))
+ ydata.append(y)
+ return ydata
-- 
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