Lib/sunaudio.py

   1 """Interpret sun audio headers."""
   2 from warnings import warnpy3k
   3 warnpy3k("the sunaudio module has been removed in Python 3.0; "
   4          "use the sunau module instead", stacklevel=2)
   5 del warnpy3k
   6
   7
   8 MAGIC = '.snd'
   9
  10 class error(Exception):
  11     pass
  12
  13
  14 def get_long_be(s):
  15     """Convert a 4-char value to integer."""
  16     return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])
  17
  18
  19 def gethdr(fp):
  20     """Read a sound header from an open file."""
  21     if fp.read(4) != MAGIC:
  22         raise error, 'gethdr: bad magic word'
  23     hdr_size = get_long_be(fp.read(4))
  24     data_size = get_long_be(fp.read(4))
  25     encoding = get_long_be(fp.read(4))
  26     sample_rate = get_long_be(fp.read(4))
  27     channels = get_long_be(fp.read(4))
  28     excess = hdr_size - 24
  29     if excess < 0:
  30         raise error, 'gethdr: bad hdr_size'
  31     if excess > 0:
  32         info = fp.read(excess)
  33     else:
  34         info = ''
  35     return (data_size, encoding, sample_rate, channels, info)
  36
  37
  38 def printhdr(file):
  39     """Read and print the sound header of a named file."""
  40     hdr = gethdr(open(file, 'r'))
  41     data_size, encoding, sample_rate, channels, info = hdr
  42     while info[-1:] == '\0':
  43         info = info[:-1]
  44     print 'File name:  ', file
  45     print 'Data size:  ', data_size
  46     print 'Encoding:   ', encoding
  47     print 'Sample rate:', sample_rate
  48     print 'Channels:   ', channels
  49     print 'Info:       ', repr(info)