💾 Archived View for tris.fyi › pydoc › sndhdr captured on 2022-01-08 at 13:42:37. Gemini links have been rewritten to link to archived content
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Routines to help recognizing sound files. Function whathdr() recognizes various types of sound file headers. It understands almost all headers that SOX can decode. The return tuple contains the following items, in this order: - file type (as SOX understands it) - sampling rate (0 if unknown or hard to decode) - number of channels (0 if unknown or hard to decode) - number of frames in the file (-1 if unknown or hard to decode) - number of bits/sample, or 'U' for U-LAW, or 'A' for A-LAW If the file doesn't have a recognizable type, it returns None. If the file can't be opened, OSError is raised. To compute the total time, divide the number of frames by the sampling rate (a frame contains a sample for each channel). Function what() calls whathdr(). (It used to also use some heuristics for raw data, but this doesn't work very well.) Finally, the function test() is a simple main program that calls what() for all files mentioned on the argument list. For directory arguments it calls what() for all files in that directory. Default argument is "." (testing all files in the current directory). The option -r tells it to recurse down directories found inside explicitly given directories.
SndHeaders(filetype, framerate, nchannels, nframes, sampwidth)
count(self, value, /) Return number of occurrences of value.
index(self, value, start=0, stop=9223372036854775807, /) Return first index of value. Raises ValueError if the value is not present.
filetype = _tuplegetter(0, "The value for type indicates the data type\nand will be one of the strings 'aifc', 'aiff', 'au','hcom',\n'sndr', 'sndt', 'voc', 'wav', '8svx', 'sb', 'ub', or 'ul'.") The value for type indicates the data type and will be one of the strings 'aifc', 'aiff', 'au','hcom', 'sndr', 'sndt', 'voc', 'wav', '8svx', 'sb', 'ub', or 'ul'.
framerate = _tuplegetter(1, 'The sampling_rate will be either the actual\nvalue or 0 if unknown or difficult to decode.') The sampling_rate will be either the actual value or 0 if unknown or difficult to decode.
nchannels = _tuplegetter(2, 'The number of channels or 0 if it cannot be\ndetermined or if the value is difficult to decode.') The number of channels or 0 if it cannot be determined or if the value is difficult to decode.
nframes = _tuplegetter(3, 'The value for frames will be either the number\nof frames or -1.') The value for frames will be either the number of frames or -1.
sampwidth = _tuplegetter(4, "Either the sample size in bits or\n'A' for A-LAW or 'U' for u-LAW.") Either the sample size in bits or 'A' for A-LAW or 'U' for u-LAW.
get_long_be(b)
get_long_le(b)
get_short_be(b)
get_short_le(b)
namedtuple(typename, field_names, *, rename=False, defaults=None, module=None)
Returns a new subclass of tuple with named fields.
>>> Point = namedtuple('Point', ['x', 'y'])
>>> Point.__doc__ # docstring for the new class
'Point(x, y)'
>>> p = Point(11, y=22) # instantiate with positional args or keywords
>>> p[0] + p[1] # indexable like a plain tuple
33
>>> x, y = p # unpack like a regular tuple
>>> x, y
(11, 22)
>>> p.x + p.y # fields also accessible by name
33
>>> d = p._asdict() # convert to a dictionary
>>> d['x']
11
>>> Point(**d) # convert from a dictionary
Point(x=11, y=22)
>>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
Point(x=100, y=22)
test()
test_8svx(h, f)
test_aifc(h, f)
test_au(h, f)
test_hcom(h, f)
test_sndr(h, f)
test_sndt(h, f)
test_voc(h, f)
test_wav(h, f)
testall(list, recursive, toplevel)
what(filename) Guess the type of a sound file.
whathdr(filename) Recognize sound headers.
tests = [<function test_aifc at 0x7f0565efc790>, <function test_au at 0x7f0565efc820>, <function test_hcom at 0x7f0565efc8b0>, <function test_voc at 0x7f0565efc940>, <function test_wav at 0x7f0565efc9d0>, <function test_8svx at 0x7f0565efca60>, <function test_sndt at 0x7f0565efcaf0>, <function test_sndr at 0x7f0565efcb80>]