The most convenient way to convert mp3 audio to caf format would be to use iTunes. Except for that, it is very likely that other audio programs with support for Apple Core format can be used for the purposes of mp3 to caf conversion.
With iTunes you can convert MP3 to Apple Core Audio Format (CAF) using the following steps. Open Edit menu ► Preferences ► Import settings ► Set Import Using to AIFF Encoder ► Ok button ► Right click on MP3 file ► create AIFF version.
Open MP3 file Open CAF file
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