iOS AudioSession Error Code

/*!
    @file       AudioSessionTypes.h
    @framework  CoreAudioTypes.framework
    @copyright  (c) 2009-2019 by Apple, Inc., all rights reserved.
    @abstract   Definitions for types used by AVAudioSession.
*/

#ifndef CoreAudioTypes_AudioSessionTypes_h
#define CoreAudioTypes_AudioSessionTypes_h

#include 

// Types which are binary-compatible with NS(U)Integer but without pulling in objc headers.
#if __LP64__ || 0 || NS_BUILD_32_LIKE_64
typedef long AVAudioInteger;
typedef unsigned long AVAudioUInteger;
#else
typedef int AVAudioInteger;
typedef unsigned int AVAudioUInteger;
#endif

#ifdef __OBJC__
 // Needed for apinotes.
@class AVAudioSession;
#endif

/*!
    @enum    AVAudioSessionErrorCode
    @brief    Error codes returned from the AVAudioSession API.
    @var        AVAudioSessionErrorCodeNone
        Operation succeeded.
    @var        AVAudioSessionErrorCodeMediaServicesFailed
        The app attempted to use the audio session during or after a Media Services failure.  App
        should wait for a AVAudioSessionMediaServicesWereResetNotification and then rebuild all
        its state.
    @var        AVAudioSessionErrorCodeIsBusy
        The app attempted to set its audio session inactive or change its AVAudioSessionIOType,
        but it is still actively playing and/or recording.
    @var        AVAudioSessionErrorCodeIncompatibleCategory
        The app tried to perform an operation on a session but its category does not support it.
        For instance, if the app calls setPreferredInputNumberOfChannels: while in a playback-only
        category.
    @var        AVAudioSessionErrorCodeCannotInterruptOthers
        The app's audio session is non-mixable and trying to go active while in the background.
        This is allowed only when the app is the NowPlaying app.
    @var        AVAudioSessionErrorCodeMissingEntitlement
        The app does not have the required entitlements to perform an operation.
    @var        AVAudioSessionErrorCodeSiriIsRecording
        The app tried to do something with the audio session that is not allowed while Siri is
        recording.
    @var        AVAudioSessionErrorCodeCannotStartPlaying
        The app is not allowed to start recording and/or playing, usually because of a lack of audio
        key in its Info.plist.  This could also happen if the app has this key but uses a category
        that can't record and/or play in the background (AVAudioSessionCategoryAmbient,
        AVAudioSessionCategorySoloAmbient, etc.).
    @var        AVAudioSessionErrorCodeCannotStartRecording
        The app is not allowed to start recording, usually because it is starting a mixable
        recording from the background and is not an Inter-App Audio app.
    @var        AVAudioSessionErrorCodeBadParam
        An illegal value was used for a property.
    @var        AVAudioSessionErrorInsufficientPriority
        The app was not allowed to set the audio category because another app (Phone, etc.) is
        controlling it.
    @var        AVAudioSessionErrorCodeResourceNotAvailable
        The operation failed because the device does not have sufficient hardware resources to
        complete the action. For example, the operation requires audio input hardware, but the
        device has no audio input available.
    @var         AVAudioSessionErrorCodeExpiredSession
        The operation failed because the associated session has been destroyed.
    @var        AVAudioSessionErrorCodeUnspecified
        An unspecified error has occurred.
    @var        AVAudioSessionErrorCodeSessionNotActive
        The operation failed because the session is not active.
 */
typedef CF_ENUM(AVAudioInteger, AVAudioSessionErrorCode) {
    AVAudioSessionErrorCodeNone = 0,
    AVAudioSessionErrorCodeMediaServicesFailed = 'msrv',   // 0x6D737276, 1836282486
    AVAudioSessionErrorCodeIsBusy = '!act',                // 0x21616374, 560030580
    AVAudioSessionErrorCodeIncompatibleCategory = '!cat',  // 0x21636174, 560161140
    AVAudioSessionErrorCodeCannotInterruptOthers = '!int', // 0x21696E74, 560557684
    AVAudioSessionErrorCodeMissingEntitlement = 'ent?',    // 0x656E743F, 1701737535
    AVAudioSessionErrorCodeSiriIsRecording = 'siri',       // 0x73697269, 1936290409
    AVAudioSessionErrorCodeCannotStartPlaying = '!pla',    // 0x21706C61, 561015905
    AVAudioSessionErrorCodeCannotStartRecording = '!rec',  // 0x21726563, 561145187
    AVAudioSessionErrorCodeBadParam = -50,
    AVAudioSessionErrorCodeInsufficientPriority = '!pri',  // 0x21707269, 561017449
    AVAudioSessionErrorCodeResourceNotAvailable = '!res',  // 0x21726573, 561145203
    AVAudioSessionErrorCodeUnspecified = 'what',           // 0x77686174, 2003329396
    AVAudioSessionErrorCodeExpiredSession = '!ses',        // 0x21736573, 561210739
    AVAudioSessionErrorCodeSessionNotActive = 'inac',      // 0x696e6163, 1768841571
};

enum {
    AVAudioSessionErrorInsufficientPriority API_DEPRECATED_WITH_REPLACEMENT("AVAudioSessionErrorCodeInsufficientPriority", ios(7.0, 12.0)) API_UNAVAILABLE(macos) = AVAudioSessionErrorCodeInsufficientPriority
};

#endif // CoreAudioTypes_AudioSessionTypes_h