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- # Module 'sunaudio' -- interpret sun audio headers
-
- MAGIC = '.snd'
-
- error = 'sunaudio sound header conversion error'
-
-
- # convert a 4-char value to integer
-
- def get_long_be(s):
- return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])
-
-
- # read a sound header from an open file
-
- def gethdr(fp):
- if fp.read(4) <> MAGIC:
- raise error, 'gethdr: bad magic word'
- hdr_size = get_long_be(fp.read(4))
- data_size = get_long_be(fp.read(4))
- encoding = get_long_be(fp.read(4))
- sample_rate = get_long_be(fp.read(4))
- channels = get_long_be(fp.read(4))
- excess = hdr_size - 24
- if excess < 0:
- raise error, 'gethdr: bad hdr_size'
- if excess > 0:
- info = fp.read(excess)
- else:
- info = ''
- return (data_size, encoding, sample_rate, channels, info)
-
-
- # read and print the sound header of a named file
-
- def printhdr(file):
- hdr = gethdr(open(file, 'r'))
- data_size, encoding, sample_rate, channels, info = hdr
- while info[-1:] == '\0':
- info = info[:-1]
- print 'File name: ', file
- print 'Data size: ', data_size
- print 'Encoding: ', encoding
- print 'Sample rate:', sample_rate
- print 'Channels: ', channels
- print 'Info: ', `info`
-