"""Interpret sun audio headers."""

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from warnings import warnpy3k

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warnpy3k("the sunaudio module has been removed in Python 3.0; "

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"use the sunau module instead", stacklevel=2)

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del warnpy3k

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MAGIC = '.snd'

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class error(Exception):

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pass

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def get_long_be(s):

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"""Convert a 4-char value to integer."""

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return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])

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def gethdr(fp):

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"""Read a sound header from an open file."""

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if fp.read(4) != MAGIC:

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raise error, 'gethdr: bad magic word'

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hdr_size = get_long_be(fp.read(4))

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data_size = get_long_be(fp.read(4))

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encoding = get_long_be(fp.read(4))

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sample_rate = get_long_be(fp.read(4))

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channels = get_long_be(fp.read(4))

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excess = hdr_size - 24

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if excess < 0:

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raise error, 'gethdr: bad hdr_size'

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if excess > 0:

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info = fp.read(excess)

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else:

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info = ''

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return (data_size, encoding, sample_rate, channels, info)

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def printhdr(file):

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"""Read and print the sound header of a named file."""

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hdr = gethdr(open(file, 'r'))

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data_size, encoding, sample_rate, channels, info = hdr

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while info[-1:] == '\0':

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info = info[:-1]

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print 'File name: ', file

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print 'Data size: ', data_size

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print 'Encoding: ', encoding

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print 'Sample rate:', sample_rate

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print 'Channels: ', channels

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print 'Info: ', repr(info)

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