mt3/event_codec_test.py

# Copyright 2022 The MT3 Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# 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 "AS IS" 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.

"""Tests for event_codec."""

from absl.testing import absltest
from mt3 import event_codec

Event = event_codec.Event
EventRange = event_codec.EventRange


class EventCodecTest(absltest.TestCase):

  def test_encode_decode(self):
    ec = event_codec.Codec(
        max_shift_steps=100,
        steps_per_second=100,
        event_ranges=[EventRange('pitch', min_value=0, max_value=127)])
    events = [
        Event(type='pitch', value=60),
        Event(type='shift', value=5),
        Event(type='pitch', value=62),
    ]
    encoded = [ec.encode_event(e) for e in events]
    self.assertSequenceEqual([161, 5, 163], encoded)

    decoded = [ec.decode_event_index(idx) for idx in encoded]
    self.assertSequenceEqual(events, decoded)

  def test_shift_steps(self):
    ec = event_codec.Codec(
        max_shift_steps=100,
        steps_per_second=100,
        event_ranges=[EventRange('pitch', min_value=0, max_value=127)])

    self.assertEqual(100, ec.max_shift_steps)
    self.assertFalse(ec.is_shift_event_index(-1))
    self.assertTrue(ec.is_shift_event_index(0))
    self.assertTrue(ec.is_shift_event_index(100))
    self.assertFalse(ec.is_shift_event_index(101))

if __name__ == '__main__':
  absltest.main()