Source code for mindspore.dataset.audio.utils

# Copyright 2021-2022 Huawei Technologies Co., Ltd
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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"""Enum for audio ops."""
from __future__ import absolute_import

from enum import Enum

import mindspore._c_dataengine as cde
from mindspore.dataset.core.validator_helpers import check_non_negative_float32, check_non_negative_int32, \
    check_pos_float32, check_pos_int32, type_check


[文档]class BorderType(str, Enum): """ Padding Mode, BorderType Type. Possible enumeration values are: BorderType.CONSTANT, BorderType.EDGE, BorderType.REFLECT, BorderType.SYMMETRIC. - BorderType.CONSTANT: means it fills the border with constant values. - BorderType.EDGE: means it pads with the last value on the edge. - BorderType.REFLECT: means it reflects the values on the edge omitting the last value of edge. - BorderType.SYMMETRIC: means it reflects the values on the edge repeating the last value of edge. Note: This class derived from class str to support json serializable. """ CONSTANT: str = "constant" EDGE: str = "edge" REFLECT: str = "reflect" SYMMETRIC: str = "symmetric"
[文档]class DensityFunction(str, Enum): """ Density Functions. Possible enumeration values are: DensityFunction.TPDF, DensityFunction.RPDF, DensityFunction.GPDF. - DensityFunction.TPDF: means triangular probability density function. - DensityFunction.RPDF: means rectangular probability density function. - DensityFunction.GPDF: means gaussian probability density function. """ TPDF: str = "TPDF" RPDF: str = "RPDF" GPDF: str = "GPDF"
[文档]class FadeShape(str, Enum): """ Fade Shapes. Possible enumeration values are: FadeShape.QUARTER_SINE, FadeShape.HALF_SINE, FadeShape.LINEAR, FadeShape.LOGARITHMIC, FadeShape.EXPONENTIAL. - FadeShape.QUARTER_SINE: means the fade shape is quarter_sine mode. - FadeShape.HALF_SINE: means the fade shape is half_sine mode. - FadeShape.LINEAR: means the fade shape is linear mode. - FadeShape.LOGARITHMIC: means the fade shape is logarithmic mode. - FadeShape.EXPONENTIAL: means the fade shape is exponential mode. """ QUARTER_SINE: str = "quarter_sine" HALF_SINE: str = "half_sine" LINEAR: str = "linear" LOGARITHMIC: str = "logarithmic" EXPONENTIAL: str = "exponential"
[文档]class GainType(str, Enum): """ Gain Types. Possible enumeration values are: GainType.AMPLITUDE, GainType.POWER, GainType.DB. - GainType.AMPLITUDE: means input gain type is amplitude. - GainType.POWER: means input gain type is power. - GainType.DB: means input gain type is decibel. """ AMPLITUDE: str = "amplitude" POWER: str = "power" DB: str = "db"
[文档]class Interpolation(str, Enum): """ Interpolation Type. Possible enumeration values are: Interpolation.LINEAR, Interpolation.QUADRATIC. - Interpolation.LINEAR: means input interpolation type is linear. - Interpolation.QUADRATIC: means input interpolation type is quadratic. """ LINEAR: str = "linear" QUADRATIC: str = "quadratic"
[文档]class MelType(str, Enum): """ Mel Types. Possible enumeration values are: MelType.HTK, MelType.SLANEY. - MelType.NONE: scale the input data with htk. - MelType.ORTHO: scale the input data with slaney. """ HTK: str = "htk" SLANEY: str = "slaney"
[文档]class Modulation(str, Enum): """ Modulation Type. Possible enumeration values are: Modulation.SINUSOIDAL, Modulation.TRIANGULAR. - Modulation.SINUSOIDAL: means input modulation type is sinusoidal. - Modulation.TRIANGULAR: means input modulation type is triangular. """ SINUSOIDAL: str = "sinusoidal" TRIANGULAR: str = "triangular"
[文档]class NormMode(str, Enum): """ Norm Types. Possible enumeration values are: NormMode.ORTHO, NormMode.NONE. - NormMode.ORTHO: means the mode of input audio is ortho. - NormMode.NONE: means the mode of input audio is none. """ ORTHO: str = "ortho" NONE: str = "none"
[文档]class NormType(str, Enum): """ Norm Types. Possible enumeration values are: NormType.SLANEY, NormType.NONE. - NormType.SLANEY: norm the input data with slaney. - NormType.NONE: norm the input data with none. """ SLANEY: str = "slaney" NONE: str = "none"
[文档]class ResampleMethod(str, Enum): """ Resample method Possible enumeration values are: ResampleMethod.SINC_INTERPOLATION, ResampleMethod.KAISER_WINDOW. - ResampleMethod.SINC_INTERPOLATION: means it resample the tensor with sinc interpolation. - ResampleMethod.KAISER_WINDOW: means it resample the tensor with kaiser window. """ SINC_INTERPOLATION: str = "sinc_interpolation" KAISER_WINDOW: str = "kaiser_window"
[文档]class ScaleType(str, Enum): """ Scale Types. Possible enumeration values are: ScaleType.POWER, ScaleType.MAGNITUDE. - ScaleType.POWER: means the scale of input audio is power. - ScaleType.MAGNITUDE: means the scale of input audio is magnitude. """ POWER: str = "power" MAGNITUDE: str = "magnitude"
[文档]class WindowType(str, Enum): """ Window Function types, Possible enumeration values are: WindowType.BARTLETT, WindowType.BLACKMAN, WindowType.HAMMING, WindowType.HANN, WindowType.KAISER. - WindowType.BARTLETT: means the type of window function is Bartlett. - WindowType.BLACKMAN: means the type of window function is Blackman. - WindowType.HAMMING: means the type of window function is Hamming. - WindowType.HANN: means the type of window function is Hann. - WindowType.KAISER: means the type of window function is Kaiser, currently not supported on macOS. """ BARTLETT: str = "bartlett" BLACKMAN: str = "blackman" HAMMING: str = "hamming" HANN: str = "hann" KAISER: str = "kaiser"
DE_C_NORM_MODE = {NormMode.ORTHO: cde.NormMode.DE_NORM_MODE_ORTHO, NormMode.NONE: cde.NormMode.DE_NORM_MODE_NONE}
[文档]def create_dct(n_mfcc, n_mels, norm=NormMode.NONE): """ Create a DCT transformation matrix with shape (n_mels, n_mfcc), normalized depending on norm. Args: n_mfcc (int): Number of mfc coefficients to retain, the value must be greater than 0. n_mels (int): Number of mel filterbanks, the value must be greater than 0. norm (NormMode, optional): Normalization mode, can be NormMode.NONE or NormMode.ORTHO (default=NormMode.NONE). Returns: numpy.ndarray, the transformation matrix, to be right-multiplied to row-wise data of size (n_mels, n_mfcc). Examples: >>> from mindspore.dataset.audio import create_dct, NormMode >>> >>> dct = create_dct(100, 200, NormMode.NONE) """ if not isinstance(n_mfcc, int): raise TypeError("n_mfcc with value {0} is not of type {1}, but got {2}.".format( n_mfcc, int, type(n_mfcc))) if not isinstance(n_mels, int): raise TypeError("n_mels with value {0} is not of type {1}, but got {2}.".format( n_mels, int, type(n_mels))) if not isinstance(norm, NormMode): raise TypeError("norm with value {0} is not of type {1}, but got {2}.".format( norm, NormMode, type(norm))) if n_mfcc <= 0: raise ValueError("n_mfcc must be greater than 0, but got {0}.".format(n_mfcc)) if n_mels <= 0: raise ValueError("n_mels must be greater than 0, but got {0}.".format(n_mels)) return cde.create_dct(n_mfcc, n_mels, DE_C_NORM_MODE[norm]).as_array()
DE_C_MEL_TYPE = {MelType.HTK: cde.MelType.DE_MEL_TYPE_HTK, MelType.SLANEY: cde.MelType.DE_MEL_TYPE_SLANEY} DE_C_NORM_TYPE = {NormType.SLANEY: cde.NormType.DE_NORM_TYPE_SLANEY, NormType.NONE: cde.NormType.DE_NORM_TYPE_NONE} def linear_fbanks(n_freqs, f_min, f_max, n_filter, sample_rate): """ Creates a linear triangular filterbank. Args: n_freqs (int): Number of frequency. f_min (float): Minimum of frequency in Hz. f_max (float): Maximum of frequency in Hz. n_filter (int): Number of (linear) triangular filter. sample_rate (int): Sample rate. Returns: numpy.ndarray, the linear triangular filterbank. Examples: >>> from mindspore.dataset.audio import linear_fbanks >>> >>> fbanks = linear_fbanks(n_freqs=4096, f_min=0, f_max=8000, n_filter=40, sample_rate=16000) """ type_check(n_freqs, (int,), "n_freqs") check_non_negative_int32(n_freqs, "n_freqs") type_check(f_min, (int, float,), "f_min") check_non_negative_float32(f_min, "f_min") type_check(f_max, (int, float,), "f_max") check_pos_float32(f_max, "f_max") if f_min > f_max: raise ValueError( "Input f_min should be no more than f_max, but got f_min: {0} and f_max: {1}.".format(f_min, f_max)) type_check(n_filter, (int,), "n_filter") check_pos_int32(n_filter, "n_filter") type_check(sample_rate, (int,), "sample_rate") check_pos_int32(sample_rate, "sample_rate") return cde.linear_fbanks(n_freqs, f_min, f_max, n_filter, sample_rate).as_array()
[文档]def melscale_fbanks(n_freqs, f_min, f_max, n_mels, sample_rate, norm=NormType.NONE, mel_type=MelType.HTK): """ Create a frequency transformation matrix with shape (n_freqs, n_mels). Args: n_freqs (int): Number of frequency. f_min (float): Minimum of frequency in Hz. f_max (float): Maximum of frequency in Hz. n_mels (int): Number of mel filterbanks. sample_rate (int): Sample rate. norm (NormType, optional): Norm to use, can be NormType.NONE or NormType.SLANEY (Default: NormType.NONE). mel_type (MelType, optional): Scale to use, can be MelType.HTK or MelType.SLANEY (Default: NormType.SLANEY). Returns: numpy.ndarray, the frequency transformation matrix. Examples: >>> from mindspore.dataset.audio import melscale_fbanks >>> >>> fbanks = melscale_fbanks(n_freqs=4096, f_min=0, f_max=8000, n_mels=40, sample_rate=16000) """ type_check(n_freqs, (int,), "n_freqs") check_non_negative_int32(n_freqs, "n_freqs") type_check(f_min, (int, float,), "f_min") check_non_negative_float32(f_min, "f_min") type_check(f_max, (int, float,), "f_max") check_pos_float32(f_max, "f_max") if f_min > f_max: raise ValueError( "Input f_min should be no more than f_max, but got f_min: {0} and f_max: {1}.".format(f_min, f_max)) type_check(n_mels, (int,), "n_mels") check_pos_int32(n_mels, "n_mels") type_check(sample_rate, (int,), "sample_rate") check_pos_int32(sample_rate, "sample_rate") type_check(norm, (NormType,), "norm") type_check(mel_type, (MelType,), "mel_type") return cde.melscale_fbanks(n_freqs, f_min, f_max, n_mels, sample_rate, DE_C_NORM_TYPE[norm], DE_C_MEL_TYPE[mel_type]).as_array()