Hi pranav,
You need to read audio file and extract feature through cqcc. Check out this link. Here are many example on how to extract features in audio files. Once it is done you have to reduce the dimensionality and thus use PCA which I think you have already done in the code above. The last step you mention is classification step. There are many ways to classify them you can use sequencial model to the same. Here is the link for your help. You can also use typical classifier such as SVM or even KMeans. Just visualise your data after PCA and decide about the approach you want to go with.
I hope this helps.
Cheers.
