Develop open-source JavaScript 3gp/amr audio codec

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Project Budget (USD)
$30 - $250

Project Description:
I need a Javascript codec that converts 3gp/amr (not quite sure of the exact type) audio files produced by Android devices into a format playable within Chrome browsers. The codec has to operate 100% in the browser, with no servers involved.
There is a Javascript amr codec available here:
[url removed, login to view]
It does not work for the audio files I want to play, but I suspect a similar approach could work.
I'm attaching a sample audio file produced by my android device for testing.
The code should use a permissive free software license.

Some additional context:
[url removed, login to view]

Skills required:
Audio Services, C++ Programming, Javascript
Additional Files: 00ca9168-3b19-b7b9-6abc-e7dc0695ee6c.amr
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$ 200
in 10 days
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$ 200
in 20 days