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List:       vorbis
Subject:    Re: [Speex-dev] Re: [Vorbis] Nelly Moser Asao Codec
From:       Ralph Giles <giles () xiph ! org>
Date:       2006-10-11 16:09:01
Message-ID: 20061011160901.GA7071 () ghostscript ! com
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On Thu, Oct 12, 2006 at 01:03:50AM +1000, Jean-Marc Valin wrote:

> Has anyone ever successfully re-implemented a proprietary codec without
> reverse engineering or decompiling? Or even with reverse engineering? I
> imagine even if you had the exact code, getting the codebooks without
> decompiling would be pretty tough.

I admit I'm a little confused here too. One can make progress by

(a) looking at bitstreams
(b) looking at bitstream changes in response to input/output changes
    using the proprietary implementation as a black box
(c) getting a separate agency to do the disassembly and write 
    documentation for you. This is quite difficult these days as most 
    EULAs forbid this.

>From the contract tender it's not clear which of these methods is 
considered acceptable.

 -r
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