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341 lines
9.9 KiB
341 lines
9.9 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 data helper functions."""
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import json
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import math
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import tarfile
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from collections import namedtuple
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from typing import List
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from typing import Optional
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from typing import Text
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import jsonlines
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import numpy as np
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from deepspeech.utils.log import Log
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logger = Log(__name__).getlog()
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__all__ = [
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"load_dict", "load_cmvn", "read_manifest", "rms_to_db", "rms_to_dbfs",
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"max_dbfs", "mean_dbfs", "gain_db_to_ratio", "normalize_audio", "SOS",
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"EOS", "UNK", "BLANK", "MASKCTC", "SPACE"
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]
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IGNORE_ID = -1
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# `sos` and `eos` using same token
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SOS = "<eos>"
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EOS = SOS
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UNK = "<unk>"
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BLANK = "<blank>"
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MASKCTC = "<mask>"
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SPACE = "<space>"
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def load_dict(dict_path: Optional[Text], maskctc=False) -> Optional[List[Text]]:
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if dict_path is None:
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return None
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with open(dict_path, "r") as f:
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dictionary = f.readlines()
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char_list = [entry.strip().split(" ")[0] for entry in dictionary]
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if BLANK not in char_list:
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char_list.insert(0, BLANK)
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if EOS not in char_list:
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char_list.append(EOS)
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# for non-autoregressive maskctc model
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if maskctc and MASKCTC not in char_list:
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char_list.append(MASKCTC)
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return char_list
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def read_manifest(
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manifest_path,
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max_input_len=float('inf'),
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min_input_len=0.0,
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max_output_len=float('inf'),
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min_output_len=0.0,
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max_output_input_ratio=float('inf'),
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min_output_input_ratio=0.0, ):
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"""Load and parse manifest file.
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Args:
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manifest_path ([type]): Manifest file to load and parse.
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max_input_len ([type], optional): maximum output seq length,
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in seconds for raw wav, in frame numbers for feature data.
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Defaults to float('inf').
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min_input_len (float, optional): minimum input seq length,
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in seconds for raw wav, in frame numbers for feature data.
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Defaults to 0.0.
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max_output_len (float, optional): maximum input seq length,
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in modeling units. Defaults to 500.0.
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min_output_len (float, optional): minimum input seq length,
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in modeling units. Defaults to 0.0.
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max_output_input_ratio (float, optional):
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maximum output seq length/output seq length ratio. Defaults to 10.0.
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min_output_input_ratio (float, optional):
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minimum output seq length/output seq length ratio. Defaults to 0.05.
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Raises:
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IOError: If failed to parse the manifest.
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Returns:
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List[dict]: Manifest parsing results.
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"""
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manifest = []
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with jsonlines.open(manifest_path, 'r') as reader:
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for json_data in reader:
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feat_len = json_data["feat_shape"][
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0] if 'feat_shape' in json_data else 1.0
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token_len = json_data["token_shape"][
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0] if 'token_shape' in json_data else 1.0
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conditions = [
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feat_len >= min_input_len,
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feat_len <= max_input_len,
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token_len >= min_output_len,
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token_len <= max_output_len,
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token_len / feat_len >= min_output_input_ratio,
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token_len / feat_len <= max_output_input_ratio,
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]
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if all(conditions):
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manifest.append(json_data)
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return manifest
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# Tar File read
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TarLocalData = namedtuple('TarLocalData', ['tar2info', 'tar2object'])
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def parse_tar(file):
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"""Parse a tar file to get a tarfile object
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and a map containing tarinfoes
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"""
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result = {}
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f = tarfile.open(file)
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for tarinfo in f.getmembers():
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result[tarinfo.name] = tarinfo
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return f, result
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def subfile_from_tar(file, local_data=None):
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"""Get subfile object from tar.
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tar:tarpath#filename
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It will return a subfile object from tar file
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and cached tar file info for next reading request.
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"""
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tarpath, filename = file.split(':', 1)[1].split('#', 1)
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if local_data is None:
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local_data = TarLocalData(tar2info={}, tar2object={})
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assert isinstance(local_data, TarLocalData)
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if 'tar2info' not in local_data.__dict__:
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local_data.tar2info = {}
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if 'tar2object' not in local_data.__dict__:
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local_data.tar2object = {}
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if tarpath not in local_data.tar2info:
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fobj, infos = parse_tar(tarpath)
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local_data.tar2info[tarpath] = infos
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local_data.tar2object[tarpath] = fobj
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else:
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fobj = local_data.tar2object[tarpath]
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infos = local_data.tar2info[tarpath]
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return fobj.extractfile(infos[filename])
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def rms_to_db(rms: float):
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"""Root Mean Square to dB.
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Args:
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rms ([float]): root mean square
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Returns:
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float: dB
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"""
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return 20.0 * math.log10(max(1e-16, rms))
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def rms_to_dbfs(rms: float):
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"""Root Mean Square to dBFS.
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https://fireattack.wordpress.com/2017/02/06/replaygain-loudness-normalization-and-applications/
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Audio is mix of sine wave, so 1 amp sine wave's Full scale is 0.7071, equal to -3.0103dB.
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dB = dBFS + 3.0103
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dBFS = db - 3.0103
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e.g. 0 dB = -3.0103 dBFS
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Args:
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rms ([float]): root mean square
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Returns:
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float: dBFS
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"""
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return rms_to_db(rms) - 3.0103
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def max_dbfs(sample_data: np.ndarray):
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"""Peak dBFS based on the maximum energy sample.
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Args:
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sample_data ([np.ndarray]): float array, [-1, 1].
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Returns:
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float: dBFS
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"""
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# Peak dBFS based on the maximum energy sample. Will prevent overdrive if used for normalization.
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return rms_to_dbfs(max(abs(np.min(sample_data)), abs(np.max(sample_data))))
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def mean_dbfs(sample_data):
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"""Peak dBFS based on the RMS energy.
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Args:
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sample_data ([np.ndarray]): float array, [-1, 1].
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Returns:
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float: dBFS
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"""
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return rms_to_dbfs(
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math.sqrt(np.mean(np.square(sample_data, dtype=np.float64))))
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def gain_db_to_ratio(gain_db: float):
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"""dB to ratio
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Args:
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gain_db (float): gain in dB
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Returns:
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float: scale in amp
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"""
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return math.pow(10.0, gain_db / 20.0)
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def normalize_audio(sample_data: np.ndarray, dbfs: float=-3.0103):
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"""Nomalize audio to dBFS.
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Args:
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sample_data (np.ndarray): input wave samples, [-1, 1].
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dbfs (float, optional): target dBFS. Defaults to -3.0103.
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Returns:
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np.ndarray: normalized wave
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"""
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return np.maximum(
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np.minimum(sample_data * gain_db_to_ratio(dbfs - max_dbfs(sample_data)),
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1.0), -1.0)
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def _load_json_cmvn(json_cmvn_file):
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""" Load the json format cmvn stats file and calculate cmvn
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Args:
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json_cmvn_file: cmvn stats file in json format
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Returns:
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a numpy array of [means, vars]
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"""
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with open(json_cmvn_file) as f:
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cmvn_stats = json.load(f)
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means = cmvn_stats['mean_stat']
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variance = cmvn_stats['var_stat']
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count = cmvn_stats['frame_num']
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for i in range(len(means)):
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means[i] /= count
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variance[i] = variance[i] / count - means[i] * means[i]
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if variance[i] < 1.0e-20:
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variance[i] = 1.0e-20
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variance[i] = 1.0 / math.sqrt(variance[i])
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cmvn = np.array([means, variance])
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return cmvn
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def _load_kaldi_cmvn(kaldi_cmvn_file):
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""" Load the kaldi format cmvn stats file and calculate cmvn
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Args:
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kaldi_cmvn_file: kaldi text style global cmvn file, which
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is generated by:
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compute-cmvn-stats --binary=false scp:feats.scp global_cmvn
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Returns:
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a numpy array of [means, vars]
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"""
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means = []
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variance = []
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with open(kaldi_cmvn_file, 'r') as fid:
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# kaldi binary file start with '\0B'
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if fid.read(2) == '\0B':
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logger.error('kaldi cmvn binary file is not supported, please '
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'recompute it by: compute-cmvn-stats --binary=false '
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' scp:feats.scp global_cmvn')
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sys.exit(1)
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fid.seek(0)
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arr = fid.read().split()
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assert (arr[0] == '[')
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assert (arr[-2] == '0')
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assert (arr[-1] == ']')
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feat_dim = int((len(arr) - 2 - 2) / 2)
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for i in range(1, feat_dim + 1):
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means.append(float(arr[i]))
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count = float(arr[feat_dim + 1])
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for i in range(feat_dim + 2, 2 * feat_dim + 2):
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variance.append(float(arr[i]))
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for i in range(len(means)):
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means[i] /= count
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variance[i] = variance[i] / count - means[i] * means[i]
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if variance[i] < 1.0e-20:
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variance[i] = 1.0e-20
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variance[i] = 1.0 / math.sqrt(variance[i])
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cmvn = np.array([means, variance])
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return cmvn
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def load_cmvn(cmvn_file: str, filetype: str):
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"""load cmvn from file.
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Args:
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cmvn_file (str): cmvn path.
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filetype (str): file type, optional[npz, json, kaldi].
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Raises:
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ValueError: file type not support.
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Returns:
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Tuple[np.ndarray, np.ndarray]: mean, istd
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"""
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assert filetype in ['npz', 'json', 'kaldi'], filetype
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filetype = filetype.lower()
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if filetype == "json":
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cmvn = _load_json_cmvn(cmvn_file)
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elif filetype == "kaldi":
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cmvn = _load_kaldi_cmvn(cmvn_file)
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elif filetype == "npz":
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eps = 1e-14
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npzfile = np.load(cmvn_file)
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mean = np.squeeze(npzfile["mean"])
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std = np.squeeze(npzfile["std"])
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istd = 1 / (std + eps)
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cmvn = [mean, istd]
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else:
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raise ValueError(f"cmvn file type no support: {filetype}")
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return cmvn[0], cmvn[1]
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