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51 lines
1.9 KiB
51 lines
1.9 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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"""Contains the impulse response augmentation model."""
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from deepspeech.frontend.audio import AudioSegment
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from deepspeech.frontend.augmentor.base import AugmentorBase
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from deepspeech.frontend.utility import read_manifest
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class ImpulseResponseAugmentor(AugmentorBase):
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"""Augmentation model for adding impulse response effect.
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:param rng: Random generator object.
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:type rng: random.Random
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:param impulse_manifest_path: Manifest path for impulse audio data.
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:type impulse_manifest_path: str
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"""
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def __init__(self, rng, impulse_manifest_path):
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self._rng = rng
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self._impulse_manifest = read_manifest(impulse_manifest_path)
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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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"""Add impulse response effect.
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Note that this is an in-place transformation.
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:param audio_segment: Audio segment to add effects to.
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:type audio_segment: AudioSegmenet|SpeechSegment
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"""
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impulse_json = self._rng.choice(
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self._impulse_manifest, 1, replace=False)[0]
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impulse_segment = AudioSegment.from_file(impulse_json['audio_filepath'])
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audio_segment.convolve(impulse_segment, allow_resample=True)
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