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POiPhone SDK: Is it possible to process audio file from local library
 

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  1. POiPhone SDK: Is it possible to process audio file from local library
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    <p>Well, I will try best not to make it as a 'I just want the code' question...</p> <p>I'm recently working on a project which requires some audio signal processing from local music files (e.g. iTunes Library). The whole work includes: </p> <ol> <li>Get the PCM data of an audio file (normally from iTunes library); &lt;--AudioQueue (?)</li> <li>Write the PCM data to a new file (it seems that Apple does not allow direct modification on music tracks); &lt;--CoreAudio(?)</li> <li>Do some processing and modification, like filters, manipulators, etc. &lt;-- Will be developed in C++</li> <li>Play the processed track. &lt;--RemoteIO</li> </ol> <p>The problem is, after going through some blogs and discussions:</p> <p><a href="http://lists.apple.com/archives/coreaudio-api/2009/Aug/msg00100.html" rel="nofollow noreferrer">http://lists.apple.com/archives/coreaudio-api/2009/Aug/msg00100.html</a>, <a href="http://atastypixel.com/blog/using-remoteio-audio-unit/" rel="nofollow noreferrer">http://atastypixel.com/blog/using-remoteio-audio-unit/</a></p> <p><a href="http://osdir.com/ml/coreaudio-api/2009-08/msg00093.html" rel="nofollow noreferrer">http://osdir.com/ml/coreaudio-api/2009-08/msg00093.html</a></p> <p>as well as the official sample codes, I got a feeling that the CoreAudio SDK allow us to apply audio processing <strong>only on voice demos recorded from Mic</strong>.</p> <p>My question is that: </p> <ol> <li>Can I get raw data from <strong>iTunes library tracks</strong> instead of Mic input?</li> <li>If the first question is 'No', is there a way to 'fool' the SDK to let it think it is getting data from Mic input, not from iTunes? (I have done some similar 'hacking' stuff in C# before XD)</li> <li>If the whole processing just doesn't work, can anyone provide some alternative ideas?</li> </ol> <p>Any help will be appreciated. Thank you very much :-)</p> <p>Thanks.</p>
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