The Interactive Multimedia Association (IMA) developed an ADPCM algorithm designed to be used in entertainment multimedia applications. It is particularly fast to encode and decode and does not strictly require any multiplications or floating point operations. While the encoding and decoding algorithms remain more or less constant across different IMA implementations, the specific on-disk data for
It’s been a while since we’ve run a technical post here on the blog. I recently ran across a problem that seems to be quite common amongst iPhone game developers, so I thought I’d do a quick post on it: using IMA4 (ADPCM) audio encoding on the iPhone/iPod Touch. IMA-ADPCM is a compression standard defined by the Interactive Multimedia Association that gets you 4:1 compression on 16-bit audio files
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