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