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      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)
     50