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What is the difference between OpenAL and AVAudioPlayer on the iPhone? It seems that both can be used for playing/recording audio. When would you use either? What advantages/features does each provide?
Thanks!
-MT
OpenAL is an advanced audio playback engine. You have to get a lot more “down-and-dirty” with it than you do with AVAudio player.
OpenAL is often used in games. OpenAL provides 3D sound positioning which is where things like distance related parameters come into play. It is a C based API while AVAudio is Objective C. If you don’t know medium to advanced C programing than you are going to struggle with OpenAL programming.
AVAudioPlayer is best if you just need basic playback and recording. If you need more control than OpenAL or Audio Queues is the way to go (though Audio Queues are also a C-based API). Many people seem to prefer OpenAL over Audio Queues as it’s a cross platform library and works similar to OpenGL which game programers already are quite familiar with.
In most caes outside of gaming or advanced audio synchronization situations, AVAudio is the way to go and works great. Even in games, I’m often seeing people use a combination of OpenAL (for sound effects) and AVAudio (for music playback).