iOS: Create an MP3 on device

Question

I am trying to create an MP3 audio file on the device (iPhone).

I have found that there is no possibility to record directly in MP3 format.
Only .caf file that may contain AIFF, Linear PCM etc.

I have also found here that there is an AudioConverterFillComplexBuffer function that might, theoretically, convert CAF file to MP3, but I can't find any sample code or explanation on how to use this function.

Any help will be greatly appreciated.

-- Michael Kessler

If there's no existing libraries that do it, maybe it's time someone wrote one! ;) — FrustratedWithFormsDesigner, Nov 10 '10 at 14:51
There is an API for this (`AudioConverterFillComplexBuffer`), but I don't understand how to work with it... — Michael Kessler, Nov 11 '10 at 09:10

score 1 · Accepted Answer · answered Nov 10 '10 at 16:13

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Try using LAME - open source MP3 encoder library (liblame)

http://lame.sourceforge.net/

answered Nov 10 '10 at 16:13

Brad

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Thank you. Do you know if it will work on iOS? Have you tried this library? – Michael Kessler Nov 11 '10 at 09:11

score 1 · Answer 2 · edited Jan 21 '12 at 23:14

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As far as I know LAME is GPL which may be an issue for you if you are building an iPhone app.

I believe AudioConverterFillComplexBuffer indeed is the way to go. You might want to take a look at the book "Core Audio Rough Cuts" which has explanations and examples on how to convert audio.

Good luck.

edited Jan 21 '12 at 23:14

Mrchief

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answered Sep 26 '11 at 23:43

cyborch

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iOS: Create an MP3 on device

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