AVFAudio iOS 14.5 to 15.0 API Differences

AVAudioBuffer.h
Added -[AVAudioPCMBuffer initWithPCMFormat:bufferListNoCopy:deallocator:]
AVAudioRoutingArbiter.h
Added AVAudioRoutingArbitrationCategory
Added AVAudioRoutingArbitrationCategoryPlayback
Added AVAudioRoutingArbitrationCategoryPlayAndRecord
Added AVAudioRoutingArbitrationCategoryPlayAndRecordVoice
AVAudioSession.h
Added -[AVAudioSession setSupportsMultichannelContent:error:]
Added AVAudioSession.supportsMultichannelContent
Added AVAudioSessionSpatialPlaybackCapabilitiesChangedNotification
Added AVAudioSessionSpatialAudioEnabledKey
AVAudioSessionRoute.h
Added AVAudioSessionPortDescription.spatialAudioEnabled
AVAudioUnitSampler.h
Added AVAudioUnitSampler.overallGain
Modified AVAudioUnitSampler.masterGain
AvailabilityReplacement
FromAvailablenone
ToDeprecatedoverallGain