Re: I need to analyze MP3 and AAC content in order to determine BPM . . .
Re: I need to analyze MP3 and AAC content in order to determine BPM . . .
- Subject: Re: I need to analyze MP3 and AAC content in order to determine BPM . . .
- From: "Michael A. Crawford" <email@hidden>
- Date: Fri, 17 Jul 2009 12:13:19 -0400
Thanks for the suggestions. I've looked over the CoreAudio references
for the APIs (not classes) mentioned by Brian. They seem pretty
straight-forward. Before I run with these, I need to ask, are there
any high level wrappers for these APIs in the form of Objective-C or C+
+ classes?
-Michael
----------------------
The difference between genius and stupidity...
...is that genius has its limits."
-- Albert Einstein
On Jul 16, 2009, at 5:57 PM, Brian Willoughby wrote:
On Jul 16, 2009, at 13:02, Michael A. Crawford wrote:
I know there are other programs out there that do this but I want
to integrate this functionality directly into my application.
Where do I begin? Do I need to create an audio unit?
You probably do not need an AudioUnit.
At a minimum, you probably want to take advantage of the AudioFile
and ExtAudioFile classes which are part of CoreAudio. These will
convert non-protected MP3 and AAC content to linear PCM, so that you
can then execute your own analysis algorithms, most of which is
beyond the scope of an Apple mailing list.
You might also find the Accelerate framework useful, particularly
the encompassed vecLib. These frameworks are discussed on email@hidden
Finally, it depends upon what you want to do with the BPM
information once you have calculated it. You might need to take
advantage of other API according to your end goals.
Brian Willoughby
Sound Consulting
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