magenta · wtong98 · Jul 22, 2021
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+<article id="content">
+<header>
+<h1 class="title">Module <code>note_seq.constants</code></h1>
+</header>
+<section id="section-intro">
+<p>Constants for music processing in Magenta.</p>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python"># Copyright 2021 The Magenta Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the &#34;License&#34;);
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an &#34;AS IS&#34; BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+&#34;&#34;&#34;Constants for music processing in Magenta.&#34;&#34;&#34;
+
+# Meter-related constants.
+DEFAULT_QUARTERS_PER_MINUTE = 120.0
+DEFAULT_STEPS_PER_BAR = 16  # 4/4 music sampled at 4 steps per quarter note.
+DEFAULT_STEPS_PER_QUARTER = 4
+
+# Default absolute quantization.
+DEFAULT_STEPS_PER_SECOND = 100
+
+# Standard pulses per quarter.
+# https://en.wikipedia.org/wiki/Pulses_per_quarter_note
+STANDARD_PPQ = 220
+
+# Special melody events.
+NUM_SPECIAL_MELODY_EVENTS = 2
+MELODY_NOTE_OFF = -1
+MELODY_NO_EVENT = -2
+
+# Other melody-related constants.
+MIN_MELODY_EVENT = -2
+MAX_MELODY_EVENT = 127
+MIN_MIDI_PITCH = 0  # Inclusive.
+MAX_MIDI_PITCH = 127  # Inclusive.
+NUM_MIDI_PITCHES = MAX_MIDI_PITCH - MIN_MIDI_PITCH + 1
+NOTES_PER_OCTAVE = 12
+
+# Velocity-related constants.
+MIN_MIDI_VELOCITY = 1  # Inclusive.
+MAX_MIDI_VELOCITY = 127  # Inclusive.
+
+# Program-related constants.
+MIN_MIDI_PROGRAM = 0
+MAX_MIDI_PROGRAM = 127
+
+# MIDI programs that typically sound unpitched.
+UNPITCHED_PROGRAMS = (
+    list(range(96, 104)) + list(range(112, 120)) + list(range(120, 128)))
+
+# Chord symbol for &#34;no chord&#34;.
+NO_CHORD = &#39;N.C.&#39;
+
+# The indices of the pitch classes in a major scale.
+MAJOR_SCALE = [0, 2, 4, 5, 7, 9, 11]
+
+# NOTE_KEYS[note] = The major keys that note belongs to.
+# ex. NOTE_KEYS[0] lists all the major keys that contain the note C,
+# which are:
+# [0, 1, 3, 5, 7, 8, 10]
+# [C, C#, D#, F, G, G#, A#]
+#
+# 0 = C
+# 1 = C#
+# 2 = D
+# 3 = D#
+# 4 = E
+# 5 = F
+# 6 = F#
+# 7 = G
+# 8 = G#
+# 9 = A
+# 10 = A#
+# 11 = B
+#
+# NOTE_KEYS can be generated using the code below, but is explicitly declared
+# for readability:
+# NOTE_KEYS = [[j for j in range(12) if (i - j) % 12 in MAJOR_SCALE]
+#              for i in range(12)]
+NOTE_KEYS = [
+    [0, 1, 3, 5, 7, 8, 10],
+    [1, 2, 4, 6, 8, 9, 11],
+    [0, 2, 3, 5, 7, 9, 10],
+    [1, 3, 4, 6, 8, 10, 11],
+    [0, 2, 4, 5, 7, 9, 11],
+    [0, 1, 3, 5, 6, 8, 10],
+    [1, 2, 4, 6, 7, 9, 11],
+    [0, 2, 3, 5, 7, 8, 10],
+    [1, 3, 4, 6, 8, 9, 11],
+    [0, 2, 4, 5, 7, 9, 10],
+    [1, 3, 5, 6, 8, 10, 11],
+    [0, 2, 4, 6, 7, 9, 11]
+]</code></pre>
+</details>
+</section>
+<section>
+</section>
+<section>
+</section>
+<section>
+</section>
+<section>
+</section>
+</article>
+<nav id="sidebar">
+<h1>Index</h1>
+<div class="toc">
+<ul></ul>
+</div>
+<ul id="index">
+<li><h3>Super-module</h3>
+<ul>
+<li><code><a title="note_seq" href="index.html">note_seq</a></code></li>
+</ul>
+</li>
+</ul>
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