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63 lines
1.9 KiB
Python
63 lines
1.9 KiB
Python
# True Audio support for Mutagen
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# Copyright 2006 Joe Wreschnig
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of version 2 of the GNU General Public License as
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# published by the Free Software Foundation.
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"""True Audio audio stream information and tags.
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True Audio is a lossless format designed for real-time encoding and
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decoding. This module is based on the documentation at
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http://www.true-audio.com/TTA_Lossless_Audio_Codec_-_Format_Description
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True Audio files use ID3 tags.
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"""
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__all__ = ["TrueAudio", "Open", "delete", "EasyTrueAudio"]
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from lib.mutagen.id3 import ID3FileType, delete
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from lib.mutagen._util import cdata
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class error(RuntimeError): pass
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class TrueAudioHeaderError(error, IOError): pass
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class TrueAudioInfo(object):
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"""True Audio stream information.
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Attributes:
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length - audio length, in seconds
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sample_rate - audio sample rate, in Hz
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"""
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def __init__(self, fileobj, offset):
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fileobj.seek(offset or 0)
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header = fileobj.read(18)
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if len(header) != 18 or not header.startswith("TTA"):
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raise TrueAudioHeaderError("TTA header not found")
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self.sample_rate = cdata.int_le(header[10:14])
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samples = cdata.uint_le(header[14:18])
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self.length = float(samples) / self.sample_rate
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def pprint(self):
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return "True Audio, %.2f seconds, %d Hz." % (
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self.length, self.sample_rate)
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class TrueAudio(ID3FileType):
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"""A True Audio file."""
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_Info = TrueAudioInfo
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_mimes = ["audio/x-tta"]
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def score(filename, fileobj, header):
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return (header.startswith("ID3") + header.startswith("TTA") +
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filename.lower().endswith(".tta") * 2)
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score = staticmethod(score)
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Open = TrueAudio
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class EasyTrueAudio(TrueAudio):
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"""Like MP3, but uses EasyID3 for tags."""
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from lib.mutagen.easyid3 import EasyID3 as ID3
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