| """Interpret sun audio headers.""" |
| from warnings import warnpy3k |
| warnpy3k("the sunaudio module has been removed in Python 3.0; " |
| "use the sunau module instead", stacklevel=2) |
| del warnpy3k |
| |
| |
| MAGIC = '.snd' |
| |
| class error(Exception): |
| pass |
| |
| |
| def get_long_be(s): |
| """Convert a 4-char value to integer.""" |
| return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3]) |
| |
| |
| def gethdr(fp): |
| """Read a sound header from an open file.""" |
| 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) |
| |
| |
| def printhdr(file): |
| """Read and print the sound header of a named 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: ', repr(info) |
