Speech recogition and intonation detection

问题:

I want to make an iOS app to count interrogative sentences. I will look for WH questions and also "will I, am I?" format questions.

I am not very get in the speech or audio technology world, but I did Google and found that there are few speech recognition SDKs. But still no idea how can I detect and graph intonation. Are there any SDKs that support intonation or emotional speech recognition?