Browsers don't sniff basic audio

[GPHemsley]

Neither Firefox nor Chromium sniff for the string ".snd", the basic audio signature (audio/basic). I'm not even sure that Chromium knows that such a file format exists. (Firefox at least defines AUDIO_BASIC as a MIME type constant.)

Given this, I'm guessing we can remove the signature from the spec.

[GPHemsley]

From RFC 2046:

4.3. Audio Media Type

A media type of "audio" indicates that the body contains audio data.
Although there is not yet a consensus on an "ideal" audio format for
use with computers, there is a pressing need for a format capable of
providing interoperable behavior.

The initial subtype of "basic" is specified to meet this requirement
by providing an absolutely minimal lowest common denominator audio
format. It is expected that richer formats for higher quality and/or
lower bandwidth audio will be defined by a later document.

The content of the "audio/basic" subtype is single channel audio
encoded using 8bit ISDN mu-law [PCM] at a sample rate of 8000 Hz.

Unrecognized subtypes of "audio" should at a miniumum be treated as
"application/octet-stream". Implementations may optionally elect to
pass subtypes of "audio" that they do not specifically recognize to a
robust general-purpose audio playing application, if such an
application is available.

This description is repeated in the audio/basic registration.

I'm not sure this was a format that was ever even seriously used.

[GPHemsley]

In case we ever need to bring this back, here are some links:
https://en.wikipedia.org/wiki/Au_file_format
http://fileformats.archiveteam.org/wiki/AU
https://telparia.com/fileFormatSamples/audio/au/