About WebAudioPlugin Support for Android 4.1.2

[simongcc]

Recently, I am using SoundJS to create a game and need to support Android 4.1.2
However, I found that although Android 4.1.2 Android Browser can play mp3, WebAudioPlugin give it a false mainly because
the current checking method is aimed for latest window.AudioContext and the canPlayType is also different in 4.1.2, it is audio/mpeg instead of audio/mp3 nowadays so it does not give a true when checking mp3.

I wonder if it is a good idea to add window.audio in the checking and add mp3: 'mpeg' in the EXTENSION_MAP for a compatibility purpose?

updated notes:
I found that only add mp3: 'mpeg' that the HTMLAudioPlugin can support to play mp3 in Android 4.1.2

[lannymcnie]

We can check this out. We might have to reconfigure the type checking to check both the extension AND the map. Currently if we sub in mp3:"mpeg" into the extension map it will use that, and not check for the audio/mp3.

[simongcc]

@lannymcnie Thanks for your reply and looking into it.
As a tempoary workaround for myself, I have added also mpeg:"mp3" so that it check both interchangeably.