Getting started with Festival (on iphone)

I'd like to use Festival in an iPhone app. Is this possible, considering the way Festival generates and then plays back audio files? Can I pass Festival an audio file directly from itself to play back? or is there a different way to read things?

Is there another Text-to-speech engine for C/C++ to use with iphone?

EDIT: Free is better.

EDIT: Which files are absolutely necessary to include into my project what are the core met开发者_Python百科hods of Festival? I looked at the example and the src but I'm having trouble.

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This is the Acapela TTS engine. It's license is not free however: http://www.acapela-group.com/acapela-for-iphone-multilingual-speech-synthesis-available-for-iphone-applications--2028-speech-synthesis.html