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# -*- coding: utf-8 -*-
# Copyright 2020 Minh Nguyen (@dathudeptrai)
#
# 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.
"""Dataset modules."""
import logging
import os
import numpy as np
import tensorflow as tf
from tensorflow_tts.datasets.abstract_dataset import AbstractDataset
from tensorflow_tts.utils import find_files
class AudioMelDataset(AbstractDataset):
"""Tensorflow Audio Mel dataset."""
def __init__(
self,
root_dir,
audio_query="*-wave.npy",
mel_query="*-raw-feats.npy",
audio_load_fn=np.load,
mel_load_fn=np.load,
audio_length_threshold=0,
mel_length_threshold=0,
):
"""Initialize dataset.
Args:
root_dir (str): Root directory including dumped files.
audio_query (str): Query to find audio files in root_dir.
mel_query (str): Query to find feature files in root_dir.
audio_load_fn (func): Function to load audio file.
mel_load_fn (func): Function to load feature file.
audio_length_threshold (int): Threshold to remove short audio files.
mel_length_threshold (int): Threshold to remove short feature files.
return_utt_id (bool): Whether to return the utterance id with arrays.
"""
# find all of audio and mel files.
audio_files = sorted(find_files(root_dir, audio_query))
mel_files = sorted(find_files(root_dir, mel_query))
# assert the number of files
assert len(audio_files) != 0, f"Not found any audio files in ${root_dir}."
assert len(audio_files) == len(
mel_files
), f"Number of audio and mel files are different ({len(audio_files)} vs {len(mel_files)})."
if ".npy" in audio_query:
suffix = audio_query[1:]
utt_ids = [os.path.basename(f).replace(suffix, "") for f in audio_files]
# set global params
self.utt_ids = utt_ids
self.audio_files = audio_files
self.mel_files = mel_files
self.audio_load_fn = audio_load_fn
self.mel_load_fn = mel_load_fn
self.audio_length_threshold = audio_length_threshold
self.mel_length_threshold = mel_length_threshold
def get_args(self):
return [self.utt_ids]
def generator(self, utt_ids):
for i, utt_id in enumerate(utt_ids):
audio_file = self.audio_files[i]
mel_file = self.mel_files[i]
items = {
"utt_ids": utt_id,
"audio_files": audio_file,
"mel_files": mel_file,
}
yield items
@tf.function
def _load_data(self, items):
audio = tf.numpy_function(np.load, [items["audio_files"]], tf.float32)
mel = tf.numpy_function(np.load, [items["mel_files"]], tf.float32)
items = {
"utt_ids": items["utt_ids"],
"audios": audio,
"mels": mel,
"mel_lengths": len(mel),
"audio_lengths": len(audio),
}
return items
def create(
self,
allow_cache=False,
batch_size=1,
is_shuffle=False,
map_fn=None,
reshuffle_each_iteration=True,
):
"""Create tf.dataset function."""
output_types = self.get_output_dtypes()
datasets = tf.data.Dataset.from_generator(
self.generator, output_types=output_types, args=(self.get_args())
)
options = tf.data.Options()
options.experimental_distribute.auto_shard_policy = tf.data.experimental.AutoShardPolicy.OFF
datasets = datasets.with_options(options)
# load dataset
datasets = datasets.map(
lambda items: self._load_data(items), tf.data.experimental.AUTOTUNE
)
datasets = datasets.filter(
lambda x: x["mel_lengths"] > self.mel_length_threshold
)
datasets = datasets.filter(
lambda x: x["audio_lengths"] > self.audio_length_threshold
)
if allow_cache:
datasets = datasets.cache()
if is_shuffle:
datasets = datasets.shuffle(
self.get_len_dataset(),
reshuffle_each_iteration=reshuffle_each_iteration,
)
if batch_size > 1 and map_fn is None:
raise ValueError("map function must define when batch_size > 1.")
if map_fn is not None:
datasets = datasets.map(map_fn, tf.data.experimental.AUTOTUNE)
# define padded shapes
padded_shapes = {
"utt_ids": [],
"audios": [None],
"mels": [None, 80],
"mel_lengths": [],
"audio_lengths": [],
}
# define padded values
padding_values = {
"utt_ids": "",
"audios": 0.0,
"mels": 0.0,
"mel_lengths": 0,
"audio_lengths": 0,
}
datasets = datasets.padded_batch(
batch_size,
padded_shapes=padded_shapes,
padding_values=padding_values,
drop_remainder=True,
)
datasets = datasets.prefetch(tf.data.experimental.AUTOTUNE)
return datasets
def get_output_dtypes(self):
output_types = {
"utt_ids": tf.string,
"audio_files": tf.string,
"mel_files": tf.string,
}
return output_types
def get_len_dataset(self):
return len(self.utt_ids)
def __name__(self):
return "AudioMelDataset"
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