Add vidi/MidiUtils.py to share some utilities to analyze midi files

diff --git a/vidi-timeline.py b/vidi-timeline.py
index 1068545..17165fc 100755 (executable)
--- a/vidi-timeline.py
+++ b/vidi-timeline.py
@@ -26,33 +26,6 @@ import vidi
 ADD_REST_BACKGROUND = True
 
 
-def is_note(msg):
-    return msg.type == 'note_on' or msg.type == 'note_off'
-
-
-def is_note_on(msg):
-    return msg.type == 'note_on' and msg.velocity > 0
-
-
-def is_note_off(msg):
-    return ((msg.type == 'note_on' and msg.velocity == 0) or
-            (msg.type == 'note_off'))
-
-
-def check_overlapping_notes(midi_file):
-    previous_note_on = False
-    for msg in midi_file:
-        if is_note_on(msg) and msg.channel == 0:
-            if previous_note_on:
-                return True
-
-            previous_note_on = True
-        elif is_note_off(msg) and msg.channel == 0:
-            previous_note_on = False
-
-    return False
-
-
 def timeline_from_midi(midi_file, video_font_path):
     timeline = vidi.Timeline()
 
@@ -60,9 +33,9 @@ def timeline_from_midi(midi_file, video_font_path):
     start_time = 0
     for msg in midi_file:
         elapsed_time += msg.time
-        if is_note_on(msg) and msg.channel == 0:
+        if vidi.is_note_on(msg) and msg.channel == 0:
             start_time = elapsed_time
-        elif is_note_off(msg) and msg.channel == 0:
+        elif vidi.is_note_off(msg) and msg.channel == 0:
             note = vidi.MidiNote(msg.note)
             duration = elapsed_time - start_time
             print("Note name: %3s start_time: %f duration: %f" %
@@ -104,7 +77,7 @@ def main():
 
     midi_file = mido.MidiFile(sys.argv[1])
 
-    overlapping_notes = check_overlapping_notes(midi_file)
+    overlapping_notes = vidi.check_overlapping_notes(midi_file)
     if overlapping_notes:
         sys.stderr.write("Sorry, supporting only midi file with no overlapping notes on channel 0\n")
         return 1

diff --git a/vidi/MidiUtils.py b/vidi/MidiUtils.py
new file mode 100755 (executable)
index 0000000..f9b964b
--- /dev/null
+++ b/vidi/MidiUtils.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+#
+# MidiUtils - misc utilities to analyze midi files opened with python-mido
+#
+# Copyright (C) 2016  Antonio Ospite <ao2@ao2.it>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+def is_note(msg):
+    return msg.type == 'note_on' or msg.type == 'note_off'
+
+
+def is_note_on(msg):
+    return msg.type == 'note_on' and msg.velocity > 0
+
+
+def is_note_off(msg):
+    return ((msg.type == 'note_on' and msg.velocity == 0) or
+            (msg.type == 'note_off'))
+
+
+def check_overlapping_notes(midi_file):
+    previous_note_on = False
+    for msg in midi_file:
+        if is_note_on(msg) and msg.channel == 0:
+            if previous_note_on:
+                return True
+
+            previous_note_on = True
+        elif is_note_off(msg) and msg.channel == 0:
+            previous_note_on = False
+
+    return False

diff --git a/vidi/__init__.py b/vidi/__init__.py
index 060bc66..53d457d 100755 (executable)
--- a/vidi/__init__.py
+++ b/vidi/__init__.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+from .MidiUtils import is_note, is_note_on, is_note_off, check_overlapping_notes
 from .Note import SpnNote, MidiNote, PIANO_88_KEYS_RANGE
 from .Player import Player
 from .Timeline import Timeline