AVAudioSessionOptions enum

An option that indicates whether audio from this session mixes with audio from active sessions in other audio apps. You can set this option explicitly only if the audio session category is playAndRecord, playback, or multiRoute. If you set the audio session category to ambient, the session automatically sets this option. Likewise, setting the duckOthers or interruptSpokenAudioAndMixWithOthers options also enables this option. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1616611-mixwithothers

An option that reduces the volume of other audio sessions while audio from this session plays. You can set this option only if the audio session category is playAndRecord, playback, or multiRoute. Setting it implicitly sets the mixWithOthers option. https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1616618-duckothers

An option that determines whether to pause spoken audio content from other sessions when your app plays its audio. You can set this option only if the audio session category is playAndRecord, playback, or multiRoute. Setting this option also sets mixWithOthers. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1616534-interruptspokenaudioandmixwithot

An option that determines whether Bluetooth hands-free devices appear as available input routes. You can set this option only if the audio session category is playAndRecord or record. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1616518-allowbluetooth

An option that determines whether you can stream audio from this session to Bluetooth devices that support the Advanced Audio Distribution Profile (A2DP). The system automatically routes to A2DP ports if you configure an app’s audio session to use the ambient, soloAmbient, or playback categories. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1771735-allowbluetootha2dp

An option that determines whether you can stream audio from this session to AirPlay devices. You can only explicitly set this option if the audio session’s category is set to playAndRecord. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1771736-allowairplay

An option that determines whether audio from the session defaults to the built-in speaker instead of the receiver. You can set this option only when using the playAndRecord category. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/1616462-defaulttospeaker

An option that indicates whether the system interrupts the audio session when it mutes the built-in microphone. If your app uses an audio session category that supports input and output, such as playAndRecord, you can set this option to disable the default behavior and continue using the session. See: https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions/3727255-overridemutedmicrophoneinterrupt