# `sndhdr` — Determine type of sound file

Source code: Lib/sndhdr.py

Deprecato dalla versione 3.11, sarà rimosso nella versione 3.13.: The `sndhdr` module is deprecated (see PEP 594 for details and alternatives).

The `sndhdr` provides utility functions which attempt to determine the type of sound data which is in a file. When these functions are able to determine what type of sound data is stored in a file, they return a `namedtuple()`, containing five attributes: (`filetype`, `framerate`, `nchannels`, `nframes`, `sampwidth`). 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'`. The sampling_rate will be either the actual value or `0` if unknown or difficult to decode. Similarly, channels will be either the number of channels or `0` if it cannot be determined or if the value is difficult to decode. The value for frames will be either the number of frames or `-1`. The last item in the tuple, bits_per_sample, will either be the sample size in bits or `'A'` for A-LAW or `'U'` for u-LAW.

sndhdr.what(filename)

  Determines the type of sound data stored in the file filename using `whathdr()`. If it succeeds, returns a namedtuple as described above, otherwise `None` is returned.

  Cambiato nella versione 3.5: Result changed from a tuple to a namedtuple.

sndhdr.whathdr(filename)

  Determines the type of sound data stored in a file based on the file header. The name of the file is given by filename. This function returns a namedtuple as described above on success, or `None`.

  Cambiato nella versione 3.5: Result changed from a tuple to a namedtuple.

The following sound header types are recognized, as listed below with the return value from `whathdr()`: and `what()`:

Value | Sound header format
--- | ---
`'aifc'` | Compressed Audio Interchange Files
`'aiff'` | Audio Interchange Files
`'au'` | Au Files
`'hcom'` | HCOM Files
`'sndt'` | Sndtool Sound Files
`'voc'` | Creative Labs Audio Files
`'wav'` | Waveform Audio File Format Files
`'8svx'` | 8-Bit Sampled Voice Files
`'sb'` | Signed Byte Audio Data Files
`'ub'` | UB Files
`'ul'` | uLAW Audio Files

sndhdr.tests

  A list of functions performing the individual tests. Each function takes two arguments: the byte-stream and an open file-like object. When `what()` is called with a byte-stream, the file-like object will be `None`.

  The test function should return a string describing the image type if the test succeeded, or `None` if it failed.

Example:

    >>> import sndhdr
    >>> imghdr.what('bass.wav')
    'wav'
    >>> imghdr.whathdr('bass.wav')
    'wav'