X-Git-Url: https://git.ao2.it/vidi-player.git/blobdiff_plain/2780f9db87ca6f82d325aabe88fa0e8ba14f3817..f778b0ade9ac49e0deab3f694c7e4a0905388f1b:/vidi/MidiUtils.py?ds=sidebyside

diff --git a/vidi/MidiUtils.py b/vidi/MidiUtils.py
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+++ b/vidi/MidiUtils.py
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+#!/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