mirror of
https://github.com/iluvcapra/wavinfo.git
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80 lines
2.5 KiB
Python
80 lines
2.5 KiB
Python
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from .riff_parser import parse_chunk, ListChunkDescriptor
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class WavInfoChunkReader:
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def __init__(self, f, encoding):
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self.encoding = encoding
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f.seek(0)
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parsed_chunks = parse_chunk(f)
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list_chunks = [chunk for chunk in parsed_chunks.children \
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if type(chunk) is ListChunkDescriptor]
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self.info_chunk = next((chunk for chunk in list_chunks \
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if chunk.signature == b'INFO'), None)
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#: 'ICOP' Copyright
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self.copyright = self._get_field(f,b'ICOP')
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#: 'IPRD' Product
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self.product = self._get_field(f,b'IPRD')
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#: 'IGNR' Genre
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self.genre = self._get_field(f,b'IGNR')
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#: 'IART' Artist, composer, author
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self.artist = self._get_field(f,b'IART')
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#: 'ICMT' Comment
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self.comment = self._get_field(f,b'ICMT')
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#: 'ISFT' Software, encoding application
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self.software = self._get_field(f,b'ISFT')
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#: 'ICRD' Created date
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self.created_date = self._get_field(f,b'ICRD')
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#: 'IENG' Engineer
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self.engineer = self._get_field(f,b'IENG')
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#: 'IKEY' Keywords, keyword list
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self.keywords = self._get_field(f,b'IKEY')
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#: 'INAM' Name, title
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self.title = self._get_field(f,b'INAM')
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#: 'ISRC' Source
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self.source = self._get_field(f,b'ISRC')
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#: 'TAPE' Tape
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self.tape = self._get_field(f,b'TAPE')
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def _get_field(self, f, field_ident):
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search = next( ( (chunk.start, chunk.length) for chunk in self.info_chunk.children \
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if chunk.ident == field_ident ), None)
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if search is not None:
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f.seek(search[0])
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data = f.read(search[1])
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return data.decode(self.encoding).rstrip('\0')
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else:
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return None
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def to_dict(self):
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"""
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A dictionary with all of the key/values read from the INFO scope.
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"""
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return {'copyright': self.copyright,
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'product': self.product,
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'genre': self.genre,
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'artist': self.artist,
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'comment': self.comment,
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'software': self.software,
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'created_date': self.created_date,
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'engineer': self.engineer,
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'keywords': self.keywords,
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'title': self.title,
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'source': self.source,
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'tape': self.tape
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}
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