"""parses [SPECT_PARAMS] section of config"""importattrfromattrimportconverters,validatorsfromattr.validatorsimportinstance_of
[docs]deffreq_cutoffs_validator(instance,attribute,value):iflen(value)!=2:raiseValueError(f"freq_cutoffs should be a list of two elements, but instead got: {value}")ifvalue[0]>value[1]:raiseValueError(f"lower freq_cutoff should be less than higher freq_cutoff, instead of: {value}")
[docs]defis_valid_transform_type(instance,attribute,value):ifvaluenotinVALID_TRANSFORM_TYPES:raiseValueError(f"Value for `transform_type`, {value}, in [SPECT_PARAMS] ""section of .toml file is not recognized. Must be one "f"of the following: {VALID_TRANSFORM_TYPES}")
[docs]@attr.sclassSpectParamsConfig:"""represents parameters for making spectrograms from audio and saving in files Attributes ---------- fft_size : int size of window for Fast Fourier transform, number of time bins. Default is 512. step_size : int step size for Fast Fourier transform. Default is 64. freq_cutoffs : tuple of two elements, lower and higher frequencies. Used to bandpass filter audio (using a Butter filter) before generating spectrogram. Default is None, in which case no bandpass filtering is applied. transform_type : str one of {'log_spect', 'log_spect_plus_one'}. 'log_spect' transforms the spectrogram to log(spectrogram), and 'log_spect_plus_one' does the same thing but adds one to each element. Default is None. If None, no transform is applied. thresh: int threshold minimum power for log spectrogram. spect_key : str key for accessing spectrogram in files. Default is 's'. freqbins_key : str key for accessing vector of frequency bins in files. Default is 'f'. timebins_key : str key for accessing vector of time bins in files. Default is 't'. audio_path_key : str key for accessing path to source audio file for spectogram in files. Default is 'audio_path'. """fft_size=attr.ib(converter=int,validator=instance_of(int),default=512)step_size=attr.ib(converter=int,validator=instance_of(int),default=64)freq_cutoffs=attr.ib(validator=validators.optional(freq_cutoffs_validator),default=None)thresh=attr.ib(converter=converters.optional(float),validator=validators.optional(instance_of(float)),default=None,)transform_type=attr.ib(validator=validators.optional([instance_of(str),is_valid_transform_type]),default=None,)spect_key=attr.ib(validator=instance_of(str),default="s")freqbins_key=attr.ib(validator=instance_of(str),default="f")timebins_key=attr.ib(validator=instance_of(str),default="t")audio_path_key=attr.ib(validator=instance_of(str),default="audio_path")