Can I create an M4A wrapper around IMA 4:1 AIFF audio?

Hey, I was just wondering if it's possible to wrap IMA 4:1 audio in an M4A container without re-encoding the audio. I have some AIFF files that are encoded in IMA 4:1, and translating this to Apple Lossless makes larger files (more than twice the original size). However, I want to use M4A containers so I can add iTunes tag information.
If it's not possible, I'll just go with Apple Lossless -- hard drive space is cheap these days. But it seems wasteful to re-encode the audio for no reason.

That's true, the audio encoding in IMA 4:1 is ADPCM. So basically what I'm trying to do is switch from an AIFF container to an M4A container, but keeping the same ADPCM-encoded audio stream.
I'm not too concerned about it, since I have very little audio encoded with IMA. I might as well just go with Apple Lossless and double the file size on those few files. I'll leave the question open though, in case someone does know a solution.

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