234 lines
9.9 KiB
Python
234 lines
9.9 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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"""Test to ensure correct midi input and output."""
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from collections import defaultdict
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import os.path
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import tempfile
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# internal imports
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import midi as py_midi
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import pretty_midi
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import tensorflow as tf
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from magenta.music import midi_io
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# self.midi_simple_filename contains a c-major scale of 8 quarter notes each
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# with a sustain of .95 of the entire note. Here are the first two notes dumped
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# using mididump.py:
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# midi.NoteOnEvent(tick=0, channel=0, data=[60, 100]),
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# midi.NoteOnEvent(tick=209, channel=0, data=[60, 0]),
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# midi.NoteOnEvent(tick=11, channel=0, data=[62, 100]),
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# midi.NoteOnEvent(tick=209, channel=0, data=[62, 0]),
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_SIMPLE_MIDI_FILE_VELO = 100
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_SIMPLE_MIDI_FILE_NUM_NOTES = 8
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_SIMPLE_MIDI_FILE_SUSTAIN = .95
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# self.midi_complex_filename contains many instruments including percussion as
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# well as control change and pitch bend events.
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# self.midi_is_drum_filename contains 41 tracks, two of which are on channel 9.
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# self.midi_event_order_filename contains notes ordered
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# non-monotonically by pitch. Here are relevent events as printed by
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# mididump.py:
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# midi.NoteOnEvent(tick=0, channel=0, data=[1, 100]),
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# midi.NoteOnEvent(tick=0, channel=0, data=[3, 100]),
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# midi.NoteOnEvent(tick=0, channel=0, data=[2, 100]),
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# midi.NoteOnEvent(tick=4400, channel=0, data=[3, 0]),
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# midi.NoteOnEvent(tick=0, channel=0, data=[1, 0]),
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# midi.NoteOnEvent(tick=0, channel=0, data=[2, 0]),
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class MidiIoTest(tf.test.TestCase):
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def setUp(self):
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self.midi_simple_filename = os.path.join(
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tf.resource_loader.get_data_files_path(), '../testdata/example.mid')
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self.midi_complex_filename = os.path.join(
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tf.resource_loader.get_data_files_path(),
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'../testdata/example_complex.mid')
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self.midi_is_drum_filename = os.path.join(
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tf.resource_loader.get_data_files_path(),
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'../testdata/example_is_drum.mid')
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self.midi_event_order_filename = os.path.join(
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tf.resource_loader.get_data_files_path(),
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'../testdata/example_event_order.mid')
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def CheckPrettyMidiAndSequence(self, midi, sequence_proto):
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"""Compares PrettyMIDI object against a sequence proto.
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Args:
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midi: A pretty_midi.PrettyMIDI object.
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sequence_proto: A tensorflow.magenta.Sequence proto.
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"""
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# Test time signature changes.
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self.assertEqual(len(midi.time_signature_changes),
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len(sequence_proto.time_signatures))
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for midi_time, sequence_time in zip(midi.time_signature_changes,
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sequence_proto.time_signatures):
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self.assertEqual(midi_time.numerator, sequence_time.numerator)
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self.assertEqual(midi_time.denominator, sequence_time.denominator)
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self.assertAlmostEqual(midi_time.time, sequence_time.time)
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# Test key signature changes.
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self.assertEqual(len(midi.key_signature_changes),
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len(sequence_proto.key_signatures))
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for midi_key, sequence_key in zip(midi.key_signature_changes,
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sequence_proto.key_signatures):
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self.assertEqual(midi_key.key_number % 12, sequence_key.key)
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self.assertEqual(midi_key.key_number / 12, sequence_key.mode)
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self.assertAlmostEqual(midi_key.time, sequence_key.time)
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# Test tempos.
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midi_times, midi_qpms = midi.get_tempo_changes()
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self.assertEqual(len(midi_times),
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len(sequence_proto.tempos))
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self.assertEqual(len(midi_qpms),
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len(sequence_proto.tempos))
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for midi_time, midi_qpm, sequence_tempo in zip(
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midi_times, midi_qpms, sequence_proto.tempos):
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self.assertAlmostEqual(midi_qpm, sequence_tempo.qpm)
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self.assertAlmostEqual(midi_time, sequence_tempo.time)
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# Test instruments.
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seq_instruments = defaultdict(lambda: defaultdict(list))
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for seq_note in sequence_proto.notes:
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seq_instruments[
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(seq_note.instrument, seq_note.program, seq_note.is_drum)][
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'notes'].append(seq_note)
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for seq_bend in sequence_proto.pitch_bends:
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seq_instruments[
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(seq_bend.instrument, seq_bend.program, seq_bend.is_drum)][
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'bends'].append(seq_bend)
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for seq_control in sequence_proto.control_changes:
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seq_instruments[
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(seq_control.instrument, seq_control.program, seq_control.is_drum)][
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'controls'].append(seq_control)
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sorted_seq_instrument_keys = sorted(
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seq_instruments.keys(),
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key=lambda (instr, program, is_drum): (instr, program, is_drum))
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self.assertEqual(len(midi.instruments), len(seq_instruments))
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for midi_instrument, seq_instrument_key in zip(
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midi.instruments, sorted_seq_instrument_keys):
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seq_instrument_notes = seq_instruments[seq_instrument_key]['notes']
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self.assertEqual(len(midi_instrument.notes), len(seq_instrument_notes))
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for midi_note, sequence_note in zip(midi_instrument.notes,
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seq_instrument_notes):
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self.assertEqual(midi_note.pitch, sequence_note.pitch)
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self.assertEqual(midi_note.velocity, sequence_note.velocity)
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self.assertAlmostEqual(midi_note.start, sequence_note.start_time)
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self.assertAlmostEqual(midi_note.end, sequence_note.end_time)
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seq_instrument_pitch_bends = seq_instruments[seq_instrument_key]['bends']
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self.assertEqual(len(midi_instrument.pitch_bends),
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len(seq_instrument_pitch_bends))
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for midi_pitch_bend, sequence_pitch_bend in zip(
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midi_instrument.pitch_bends,
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seq_instrument_pitch_bends):
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self.assertEqual(midi_pitch_bend.pitch, sequence_pitch_bend.bend)
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self.assertAlmostEqual(midi_pitch_bend.time, sequence_pitch_bend.time)
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def CheckMidiToSequence(self, filename):
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"""Test the translation from PrettyMIDI to Sequence proto."""
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source_midi = pretty_midi.PrettyMIDI(filename)
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sequence_proto = midi_io.midi_to_sequence_proto(source_midi)
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self.CheckPrettyMidiAndSequence(source_midi, sequence_proto)
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def CheckSequenceToPrettyMidi(self, filename):
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"""Test the translation from Sequence proto to PrettyMIDI."""
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source_midi = pretty_midi.PrettyMIDI(filename)
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sequence_proto = midi_io.midi_to_sequence_proto(source_midi)
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translated_midi = midi_io.sequence_proto_to_pretty_midi(sequence_proto)
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self.CheckPrettyMidiAndSequence(translated_midi, sequence_proto)
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def CheckReadWriteMidi(self, filename):
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"""Test writing to a MIDI file and comparing it to the original Sequence."""
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# TODO(deck): The input MIDI file is opened in pretty-midi and
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# re-written to a temp file, sanitizing the MIDI data (reordering
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# note ons, etc). Issue 85 in the pretty-midi GitHub
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# (http://github.com/craffel/pretty-midi/issues/85) requests that
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# this sanitization be available outside of the context of a file
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# write. If that is implemented, this rewrite code should be
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# modified or deleted.
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with tempfile.NamedTemporaryFile(prefix='MidiIoTest') as rewrite_file:
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original_midi = pretty_midi.PrettyMIDI(filename)
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original_midi.write(rewrite_file.name)
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source_midi = pretty_midi.PrettyMIDI(rewrite_file.name)
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sequence_proto = midi_io.midi_to_sequence_proto(source_midi)
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# Translate the NoteSequence to MIDI and write to a file.
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with tempfile.NamedTemporaryFile(prefix='MidiIoTest') as temp_file:
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midi_io.sequence_proto_to_midi_file(sequence_proto, temp_file.name)
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# Read it back in and compare to source.
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created_midi = pretty_midi.PrettyMIDI(temp_file.name)
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self.CheckPrettyMidiAndSequence(created_midi, sequence_proto)
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def testSimplePrettyMidiToSequence(self):
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self.CheckMidiToSequence(self.midi_simple_filename)
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def testSimpleSequenceToPrettyMidi(self):
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self.CheckSequenceToPrettyMidi(self.midi_simple_filename)
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def testSimpleReadWriteMidi(self):
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self.CheckReadWriteMidi(self.midi_simple_filename)
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def testComplexPrettyMidiToSequence(self):
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self.CheckMidiToSequence(self.midi_complex_filename)
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def testComplexSequenceToPrettyMidi(self):
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self.CheckSequenceToPrettyMidi(self.midi_complex_filename)
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def testIsDrumDetection(self):
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"""Verify that is_drum instruments are properly tracked.
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self.midi_is_drum_filename is a MIDI file containing two tracks
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set to channel 9 (is_drum == True). Each contains one NoteOn. This
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test is designed to catch a bug where the second track would lose
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is_drum, remapping the drum track to an instrument track.
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"""
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sequence_proto = midi_io.midi_file_to_sequence_proto(
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self.midi_is_drum_filename)
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with tempfile.NamedTemporaryFile(prefix='MidiDrumTest') as temp_file:
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midi_io.sequence_proto_to_midi_file(sequence_proto, temp_file.name)
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midi_data1 = py_midi.read_midifile(self.midi_is_drum_filename)
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midi_data2 = py_midi.read_midifile(temp_file.name)
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# Count number of channel 9 Note Ons.
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channel_counts = [0, 0]
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for index, midi_data in enumerate([midi_data1, midi_data2]):
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for track in midi_data:
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for event in track:
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if (event.name == 'Note On' and
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event.velocity > 0 and event.channel == 9):
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channel_counts[index] += 1
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self.assertEqual(channel_counts, [2, 2])
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def testComplexReadWriteMidi(self):
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self.CheckReadWriteMidi(self.midi_complex_filename)
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def testEventOrdering(self):
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self.CheckReadWriteMidi(self.midi_event_order_filename)
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if __name__ == '__main__':
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tf.test.main()
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