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89 lines
2.7 KiB
Python
89 lines
2.7 KiB
Python
import os
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from abc import ABC
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from abc import abstractmethod
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class EmbedderBase(ABC):
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"""
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The subclass must define the supported media file encoding
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formats here using a static variable - such as:
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>>> supported_formats = ("mp3", "opus", "flac")
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"""
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supported_formats = ()
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@abstractmethod
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def __init__(self):
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"""
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For every supported format, there must be a corresponding
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method that applies metadata on this format.
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Such as if mp3 is supported, there must exist a method named
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`as_mp3` on this class that applies metadata on mp3 files.
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"""
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# self.targets = { fmt: eval(str("self.as_" + fmt))
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# for fmt in self.supported_formats }
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#
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# TODO: The above code seems to fail for some reason
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# I do not know.
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self.targets = {}
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for fmt in self.supported_formats:
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# FIXME: Calling `eval` is dangerous here!
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self.targets[fmt] = eval("self.as_" + fmt)
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def get_encoding(self, path):
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"""
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This method must determine the encoding for a local
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audio file. Such as "mp3", "wav", "m4a", etc.
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"""
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_, extension = os.path.splitext(path)
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# Ignore the initial dot from file extension
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return extension[1:]
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def apply_metadata(self, path, metadata, encoding=None):
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"""
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This method must automatically detect the media encoding
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format from file path and embed the corresponding metadata
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on the given file by calling an appropriate submethod.
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"""
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if encoding is None:
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encoding = self.get_encoding(path)
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if encoding not in self.supported_formats:
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raise TypeError(
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'The input format ("{}") is not supported.'.format(
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encoding,
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))
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embed_on_given_format = self.targets[encoding]
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embed_on_given_format(path, metadata)
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def as_mp3(self, path, metadata):
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"""
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Method for mp3 support. This method might be defined in
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a subclass.
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Other methods for additional supported formats must also
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be declared here.
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"""
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raise NotImplementedError
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def as_opus(self, path, metadata):
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"""
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Method for opus support. This method might be defined in
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a subclass.
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Other methods for additional supported formats must also
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be declared here.
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"""
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raise NotImplementedError
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def as_flac(self, path, metadata):
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"""
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Method for flac support. This method might be defined in
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a subclass.
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Other methods for additional supported formats must also
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be declared here.
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"""
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raise NotImplementedError
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