Find if two pitches are 1 semitone apart and move them to avoid dissonances.

Test mode for gen.py

Author: ldrolez

gen.py

@@ -27,6 +27,7 @@
 
 import os
 import mingus.core.scales as scales
+import sys
 
 from src.chords2midi import c2m
 from chords import *
@@ -53,9 +54,18 @@
     # ('Cb', 'ab'), #  7 b
 ]
 
+# Chords in Major and minor scales
 deg_maj = ['I', 'ii', 'iii', 'IV', 'V', 'vi', 'vii']
 deg_min = ['i', 'ii', 'III', 'iv', 'v', 'VI', 'VII']
 
+# progressions styles
+styles = [ '', 'basic4', 'alt4', 'hiphop' ]
+
+# Test mode
+if len(sys.argv) > 1 and sys.argv[1] == '--test':
+    keys = [ ('C', 'A') ]
+    styles = [ '' ]
+
 #
 # Generate a single chord
 #
@@ -144,17 +154,17 @@ def genprog(dir, key, chords, prefix, style = ''):
         i = i + 1
 
     # Major progressions
-    for style in [ '', 'basic4', 'alt4', 'hiphop' ]:
+    for style in styles:
         for n in prog_maj:
             genprog(f'{base}/4 Progression/Major', root_maj, n, root_maj, style)
 
     # Minor progressions
-    for style in [ '', 'basic4', 'alt4', 'hiphop' ]:
+    for style in styles:
         for n in prog_min:
             genprog(f'{base}/4 Progression/Minor', root_min.lower(), n, root_min, style)
 
     # Modal progressions
-    for style in [ '', 'basic4', 'alt4', 'hiphop' ]:
+    for style in styles:
         for n in prog_modal:
             genprog(f'{base}/4 Progression/Modal', root_maj, n, root_maj, style)
 

src/chords2midi/c2m.py

@@ -392,6 +392,17 @@ def handle(self, argv=None):
                             else:
                                 pitches.append(new_pitch + 12)
 
+            # find if two pitches are 1 semitone apart to avoid dissonances
+            length = len(pitches)
+            for i in range(length):
+                for j in range(i + 1, length):
+                    if abs(pitches[i] - pitches[j]) == 1:
+                        # move the note one octave up
+                        if (bar/4) % 2 == 0:
+                            pitches[j] = pitches[j] + 12
+                        else:
+                            pitches[i] = pitches[i] + 12
+
             # Bassline
             if bassline:
                 pitches.append(root_pitch - 24)