Information about WAVE (.wav) sound file
Note: wavfinfo will be removed in a future release. Use audioinfo instead.
m is the string 'Sound (WAV) file', if filename is a WAVE file. Otherwise, it contains an empty string ('').
d is a string that reports the number of samples in the file and the number of channels of audio data. If filename is not a WAVE file, it contains the string 'Not a WAVE file'.