An audio session category defines a set of audio behaviors. The precise behaviors associated with each category are not under your app’s control, but rather are set by the operating system. Apple may refine category behavior in future versions of the OS. Your best strategy when selecting a category that most accurately describes your intentions for the audio behavior you want.
You can refine the configuration provided by the
play categories by using an audio session mode, as described in Audio Session Modes.
The audio session playback-only categories (
AVAudio) support both the mirrored and non-mirrored variants of AirPlay.
The audio session category
AVAudio supports only the mirrored variant of AirPlay while the
AVAudio categories do not allow routing to AirPlay.