Sound analysis to create Guitar Hero levels automatically

Question

I am trying to create a game similar to Guitar-Hero (something like this ) and I want to be able to analyze the audio file provided by the user and automatically create levels, but I'm not sure how to do it.

I thought that maybe I need to use the BPM detection algorithm and put the arrow on the bit and rail on some kind of repeating pattern, but I don't know how to implement them.

In addition, I use NAudio BlockAlignReductionStream, which has a Read method that copies byte [] data, but what happens when I read a two-channel audio file? Does it read 1 byte from the first channel and 1 byte from the second? (because it says 16-bit PCM) and does the same with a 24-bit and 32-bit float?

Answer 1

Bit Detection (or, more specifically, BPM Definition)

Overview of the bit detection algorithm for using a comb filter:

• http://www.clear.rice.edu/elec301/Projects01/beat_sync/beatalgo.html

It looks like they are doing:

• A fast Fourier transform
• Hanning Window , full-scale correction
• Multiple low pass filters ; one for each FFT output range
• Differentiation and half-wave correction
• Comb filter

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• http://tones.wolfram.com/about/faqs/howitworks.html
• http://research.microsoft.com/en-us/um/redmond/projects/songsmith/