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I wanna merge a .caf file and a .mp3 file to a .mp3 file on iPhone,or I can convert them to .aac and then merge them.How can I do this ? (Just Like Kala OK,I wanna merge my voice and the music together)
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You need to decode both files to LPCM (plain old ints), add/mix them together then re-encode. The iPhone SDK does not support MP3 encoding, so you should re-encode to AAC.
The Apple sample code iPhoneExtAudioFileConvertTest would be a good place to start.
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