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48 lines
1.3 KiB
Python
48 lines
1.3 KiB
Python
"""Interpret sun audio headers."""
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MAGIC = b'.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-byte value to integer."""
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return (s[0]<<24) | (s[1]<<16) | (s[2]<<8) | 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 = b''
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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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f = open(file, 'rb')
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try:
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hdr = gethdr(f)
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finally:
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f.close()
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data_size, encoding, sample_rate, channels, info = hdr
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while info.endswith(b'\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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