78 lines
2.1 KiB
Python
78 lines
2.1 KiB
Python
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# Copyright 2016 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Constants for music processing in Magenta."""
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# Meter-related constants.
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DEFAULT_QUARTERS_PER_MINUTE = 120.0
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DEFAULT_STEPS_PER_BAR = 16 # 4/4 music sampled at 4 steps per quarter note.
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DEFAULT_STEPS_PER_QUARTER = 4
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# Standard pulses per quarter.
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# https://en.wikipedia.org/wiki/Pulses_per_quarter_note
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STANDARD_PPQ = 96
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# Special melody events.
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NUM_SPECIAL_MELODY_EVENTS = 2
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MELODY_NOTE_OFF = -1
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MELODY_NO_EVENT = -2
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# Other melody-related constants.
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MIN_MELODY_EVENT = -2
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MAX_MELODY_EVENT = 127
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MIN_MIDI_PITCH = 0 # Inclusive.
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MAX_MIDI_PITCH = 127 # Inclusive.
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NOTES_PER_OCTAVE = 12
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# Chord symbol for "no chord".
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NO_CHORD = 'N.C.'
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# NOTE_KEYS[note] = The major keys that note belongs to.
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# ex. NOTE_KEYS[0] lists all the major keys that contain the note C,
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# which are:
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# [0, 1, 3, 5, 7, 8, 10]
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# [C, C#, D#, F, G, G#, A#]
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#
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# 0 = C
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# 1 = C#
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# 2 = D
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# 3 = D#
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# 4 = E
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# 5 = F
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# 6 = F#
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# 7 = G
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# 8 = G#
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# 9 = A
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# 10 = A#
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# 11 = B
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#
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# NOTE_KEYS can be generated using the code below, but is explicitly declared
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# for readability:
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# scale = [1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1]
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# NOTE_KEYS = [[j for j in range(12) if scale[(i - j) % 12]]
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# for i in range(12)]
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NOTE_KEYS = [
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[0, 1, 3, 5, 7, 8, 10],
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[1, 2, 4, 6, 8, 9, 11],
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[0, 2, 3, 5, 7, 9, 10],
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[1, 3, 4, 6, 8, 10, 11],
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[0, 2, 4, 5, 7, 9, 11],
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[0, 1, 3, 5, 6, 8, 10],
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[1, 2, 4, 6, 7, 9, 11],
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[0, 2, 3, 5, 7, 8, 10],
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[1, 3, 4, 6, 8, 9, 11],
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[0, 2, 4, 5, 7, 9, 10],
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[1, 3, 5, 6, 8, 10, 11],
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[0, 2, 4, 6, 7, 9, 11]
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]
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