Extract iPod Library raw PCM samples and play with sound effects

Question

I am trying to extract raw PCM samples from an MP3 in the iPod Library so that I can play the song and manipulate the pitch, tempo, and apply sound effects (such as filters)

Answer 1

For the song duration, I believe you can simply query the song Asset thusly:

float songTimeInSeconds = CMTimeGetSeconds(songAsset.duration);
    int songMinutes = (int)(songTimeInSeconds/60.);
    int songSeconds = (int)(songTimeInSeconds - 60.0*songMinutes);