Audio::Extract::PCM::Backend::SoX - sox backend for audio extraction
See "pcm" in Audio::Extract::PCM::Backend.
Note that this backend does not support read,
i.e.
it only supports the pcm method,
which will read all pcm data at once.
This will return the SoX version as a version object. The result will be cached, i.e. if you install a new sox, this module will not recognize it until it is reloaded or the application using it is restarted.
If no sox program is in the path or sox -h outputs strange things,
undef will be returned.
In the latter case,
a warning will be issued.
Currently,
the only internal use is to find out whether SoX is above version 13.0.0,
because they renamed the "-b"/"-w"/"-l"/"-d" flags to "-1"/"-2"/"-4"/"-8" by then.
Note that the old flags were still recognized (though deprecated) until SoX 14.1.0.
Abstract interface to "get_sox_version".
