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: Brian Willoughby <email@hidden>
- Date: Thu, 16 Jul 2009 14:57:23 -0700
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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