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102 lines
2.5 KiB
Python
102 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 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 the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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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 mutagen import StreamInfo
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from mutagen.id3 import ID3FileType, delete
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from mutagen._util import cdata, MutagenError, convert_error, endswith
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class error(MutagenError):
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pass
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class TrueAudioHeaderError(error):
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pass
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class TrueAudioInfo(StreamInfo):
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"""TrueAudioInfo()
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True Audio stream information.
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Attributes:
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length (`float`): audio length, in seconds
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sample_rate (`int`): audio sample rate, in Hz
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"""
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@convert_error(IOError, TrueAudioHeaderError)
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def __init__(self, fileobj, offset):
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"""Raises TrueAudioHeaderError"""
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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(b"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 u"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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"""TrueAudio(filething, ID3=None)
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A True Audio file.
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Arguments:
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filething (filething)
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ID3 (mutagen.id3.ID3)
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Attributes:
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info (`TrueAudioInfo`)
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tags (`mutagen.id3.ID3`)
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"""
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_Info = TrueAudioInfo
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_mimes = ["audio/x-tta"]
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@staticmethod
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def score(filename, fileobj, header):
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return (header.startswith(b"ID3") + header.startswith(b"TTA") +
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endswith(filename.lower(), b".tta") * 2)
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Open = TrueAudio
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class EasyTrueAudio(TrueAudio):
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"""EasyTrueAudio(filething, ID3=None)
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Like MP3, but uses EasyID3 for tags.
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Arguments:
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filething (filething)
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ID3 (mutagen.id3.ID3)
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Attributes:
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info (`TrueAudioInfo`)
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tags (`mutagen.easyid3.EasyID3`)
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"""
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from mutagen.easyid3 import EasyID3 as ID3
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ID3 = ID3
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