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49 lines
1.6 KiB
49 lines
1.6 KiB
# Copyright (c) 2021 PaddlePaddle Authors. 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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"""Contain the resample augmentation model."""
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from paddlespeech.s2t.frontend.augmentor.base import AugmentorBase
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class ResampleAugmentor(AugmentorBase):
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"""Augmentation model for resampling.
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See more info here:
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https://ccrma.stanford.edu/~jos/resample/index.html
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:param rng: Random generator object.
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:type rng: random.Random
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:param new_sample_rate: New sample rate in Hz.
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:type new_sample_rate: int
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"""
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def __init__(self, rng, new_sample_rate):
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self._new_sample_rate = new_sample_rate
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self._rng = rng
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def __call__(self, x, uttid=None, train=True):
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if not train:
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return x
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self.transform_audio(x)
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return x
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def transform_audio(self, audio_segment):
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"""Resamples the input audio to a target sample rate.
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Note that this is an in-place transformation.
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:param audio: Audio segment to add effects to.
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:type audio: AudioSegment|SpeechSegment
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"""
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audio_segment.resample(self._new_sample_rate)
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