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58 lines
1.8 KiB
Python
58 lines
1.8 KiB
Python
# A WavPack reader/tagger
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#
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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 the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# $Id: wavpack.py 3997 2007-02-25 21:44:53Z piman $
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"""WavPack reading and writing.
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WavPack is a lossless format that uses APEv2 tags. Read
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http://www.wavpack.com/ for more information.
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"""
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__all__ = ["WavPack", "Open", "delete"]
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from lib.mutagen.apev2 import APEv2File, error, delete
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from lib.mutagen._util import cdata
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class WavPackHeaderError(error): pass
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RATES = [6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000, 32000, 44100,
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48000, 64000, 88200, 96000, 192000]
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class WavPackInfo(object):
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"""WavPack stream information.
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Attributes:
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channels - number of audio channels (1 or 2)
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length - file length in seconds, as a float
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sample_rate - audio sampling rate in Hz
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version - WavPack stream version
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"""
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def __init__(self, fileobj):
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header = fileobj.read(28)
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if len(header) != 28 or not header.startswith("wvpk"):
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raise WavPackHeaderError("not a WavPack file")
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samples = cdata.uint_le(header[12:16])
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flags = cdata.uint_le(header[24:28])
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self.version = cdata.short_le(header[8:10])
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self.channels = bool(flags & 4) or 2
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self.sample_rate = RATES[(flags >> 23) & 0xF]
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self.length = float(samples) / self.sample_rate
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def pprint(self):
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return "WavPack, %.2f seconds, %d Hz" % (self.length, self.sample_rate)
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class WavPack(APEv2File):
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_Info = WavPackInfo
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_mimes = ["audio/x-wavpack"]
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def score(filename, fileobj, header):
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return header.startswith("wvpk") * 2
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score = staticmethod(score)
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