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So this is something I've been trying to get my head around when I was trying to load one of my older apps.

There's a lot of threads where people are asking for the supported audio formats in iOS. And in most of them someone comments that support for AMR (Adaptive-Multi-Rate) was dropped in iOS 4.3. How do they know this? Supported Audio file formats in iPhone

But I cannot find ANY api changes or anything about this in Apples official documentations.

i.e the diffs between 4.2 and 4.3: https://developer.apple.com/library/ios/releasenotes/General/iOS43APIDiffs/

How can I get som actual documents saying that this actually happened?

Any help here would be much appreciated!

Community
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ifMike
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1 Answers1

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The closest I ever found to a document or official statement were two responses (login required) by an Apple Employee on the old Apple Developer Forums, both saying:

As of 4.3 iOS does not support encoding or decoding AMR.
If you want AMR you'll have to put in your own decoder.

Rhythmic Fistman
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