{! @file AudioUnitUtilities.h @framework AudioToolbox.framework @copyright (c) 2002-2015 by Apple, Inc., all rights reserved. @abstract Higher-level utility functions for the use of AudioUnit clients. @discussion The AU Parameter Listener is designed to provide notifications when an Audio Unit's parameters or other state changes. It makes it unnecessary for UI components to continually poll an Audio Unit to determine if a parameter value has been changed. In order for this notification mechanism to work properly, parameter values should be changed using the AUParameterSet call (discussed below). This also makes it unnecessary for an Audio Unit to provide and support a notification mechanism, particularly as AudioUnitSetParameter may be received by an Audio Unit during the render process. The AUEventListener API's extend the AUParameterListener API's by supporting event types other than parameter changes. Events, including parameter changes are delivered serially to the listener, preserving the time order of the events and parameter changes. There are also some utilities for converting between non-linear and linear value ranges. These are useful for displaying a non-linear parameter (such as one whose units are in Hertz or decibels) using a linear control mechanism, such as a slider, to ensure that the user has a wider perceived range of control over the parameter value. } { Pascal Translation: Jonas Maebe , July 2019 } { Modified for use with Free Pascal Version 308 Please report any bugs to } {$ifc not defined MACOSALLINCLUDE or not MACOSALLINCLUDE} {$mode macpas} {$modeswitch cblocks} {$packenum 1} {$macro on} {$inline on} {$calling mwpascal} unit AudioUnitUtilities; interface {$setc UNIVERSAL_INTERFACES_VERSION := $0400} {$setc GAP_INTERFACES_VERSION := $0308} {$ifc not defined USE_CFSTR_CONSTANT_MACROS} {$setc USE_CFSTR_CONSTANT_MACROS := TRUE} {$endc} {$ifc defined CPUPOWERPC and defined CPUI386} {$error Conflicting initial definitions for CPUPOWERPC and CPUI386} {$endc} {$ifc defined FPC_BIG_ENDIAN and defined FPC_LITTLE_ENDIAN} {$error Conflicting initial definitions for FPC_BIG_ENDIAN and FPC_LITTLE_ENDIAN} {$endc} {$ifc not defined __ppc__ and defined CPUPOWERPC32} {$setc __ppc__ := 1} {$elsec} {$setc __ppc__ := 0} {$endc} {$ifc not defined __ppc64__ and defined CPUPOWERPC64} {$setc __ppc64__ := 1} {$elsec} {$setc __ppc64__ := 0} {$endc} {$ifc not defined __i386__ and defined CPUI386} {$setc __i386__ := 1} {$elsec} {$setc __i386__ := 0} {$endc} {$ifc not defined __x86_64__ and defined CPUX86_64} {$setc __x86_64__ := 1} {$elsec} {$setc __x86_64__ := 0} {$endc} {$ifc not defined __arm__ and defined CPUARM} {$setc __arm__ := 1} {$elsec} {$setc __arm__ := 0} {$endc} {$ifc not defined __arm64__ and defined CPUAARCH64} {$setc __arm64__ := 1} {$elsec} {$setc __arm64__ := 0} {$endc} {$ifc defined cpu64} {$setc __LP64__ := 1} {$elsec} {$setc __LP64__ := 0} {$endc} {$ifc defined __ppc__ and __ppc__ and defined __i386__ and __i386__} {$error Conflicting definitions for __ppc__ and __i386__} {$endc} {$ifc defined __ppc__ and __ppc__} {$setc TARGET_CPU_PPC := TRUE} {$setc TARGET_CPU_PPC64 := FALSE} {$setc TARGET_CPU_X86 := FALSE} {$setc TARGET_CPU_X86_64 := FALSE} {$setc TARGET_CPU_ARM := FALSE} {$setc TARGET_CPU_ARM64 := FALSE} {$setc TARGET_OS_MAC := TRUE} {$setc TARGET_OS_IPHONE := FALSE} {$setc TARGET_IPHONE_SIMULATOR := FALSE} {$setc TARGET_OS_EMBEDDED := FALSE} {$elifc defined __ppc64__ and __ppc64__} {$setc TARGET_CPU_PPC := FALSE} {$setc TARGET_CPU_PPC64 := TRUE} {$setc TARGET_CPU_X86 := FALSE} {$setc TARGET_CPU_X86_64 := FALSE} {$setc TARGET_CPU_ARM := FALSE} {$setc TARGET_CPU_ARM64 := FALSE} {$setc TARGET_OS_MAC := TRUE} {$setc TARGET_OS_IPHONE := FALSE} {$setc TARGET_IPHONE_SIMULATOR := FALSE} {$setc TARGET_OS_EMBEDDED := FALSE} {$elifc defined __i386__ and __i386__} {$setc TARGET_CPU_PPC := FALSE} {$setc TARGET_CPU_PPC64 := FALSE} {$setc TARGET_CPU_X86 := TRUE} {$setc TARGET_CPU_X86_64 := FALSE} {$setc TARGET_CPU_ARM := FALSE} {$setc TARGET_CPU_ARM64 := FALSE} {$ifc defined iphonesim} {$setc TARGET_OS_MAC := FALSE} {$setc TARGET_OS_IPHONE := TRUE} {$setc TARGET_IPHONE_SIMULATOR := TRUE} {$elsec} {$setc TARGET_OS_MAC := TRUE} {$setc TARGET_OS_IPHONE := FALSE} {$setc TARGET_IPHONE_SIMULATOR := FALSE} {$endc} {$setc TARGET_OS_EMBEDDED := FALSE} {$elifc defined __x86_64__ and __x86_64__} {$setc TARGET_CPU_PPC := FALSE} {$setc TARGET_CPU_PPC64 := FALSE} {$setc TARGET_CPU_X86 := FALSE} {$setc TARGET_CPU_X86_64 := TRUE} {$setc TARGET_CPU_ARM := FALSE} {$setc TARGET_CPU_ARM64 := FALSE} {$ifc defined iphonesim} {$setc TARGET_OS_MAC := FALSE} {$setc TARGET_OS_IPHONE := TRUE} {$setc TARGET_IPHONE_SIMULATOR := TRUE} {$elsec} {$setc TARGET_OS_MAC := TRUE} {$setc TARGET_OS_IPHONE := FALSE} {$setc TARGET_IPHONE_SIMULATOR := FALSE} {$endc} {$setc TARGET_OS_EMBEDDED := FALSE} {$elifc defined __arm__ and __arm__} {$setc TARGET_CPU_PPC := FALSE} {$setc TARGET_CPU_PPC64 := FALSE} {$setc TARGET_CPU_X86 := FALSE} {$setc TARGET_CPU_X86_64 := FALSE} {$setc TARGET_CPU_ARM := TRUE} {$setc TARGET_CPU_ARM64 := FALSE} {$setc TARGET_OS_MAC := FALSE} {$setc TARGET_OS_IPHONE := TRUE} {$setc TARGET_IPHONE_SIMULATOR := FALSE} {$setc TARGET_OS_EMBEDDED := TRUE} {$elifc defined __arm64__ and __arm64__} {$setc TARGET_CPU_PPC := FALSE} {$setc TARGET_CPU_PPC64 := FALSE} {$setc TARGET_CPU_X86 := FALSE} {$setc TARGET_CPU_X86_64 := FALSE} {$setc TARGET_CPU_ARM := FALSE} {$setc TARGET_CPU_ARM64 := TRUE} {$ifc defined ios} {$setc TARGET_OS_MAC := FALSE} {$setc TARGET_OS_IPHONE := TRUE} {$setc TARGET_OS_EMBEDDED := TRUE} {$elsec} {$setc TARGET_OS_MAC := TRUE} {$setc TARGET_OS_IPHONE := FALSE} {$setc TARGET_OS_EMBEDDED := FALSE} {$endc} {$setc TARGET_IPHONE_SIMULATOR := FALSE} {$elsec} {$error __ppc__ nor __ppc64__ nor __i386__ nor __x86_64__ nor __arm__ nor __arm64__ is defined.} {$endc} {$ifc defined __LP64__ and __LP64__ } {$setc TARGET_CPU_64 := TRUE} {$elsec} {$setc TARGET_CPU_64 := FALSE} {$endc} {$ifc defined FPC_BIG_ENDIAN} {$setc TARGET_RT_BIG_ENDIAN := TRUE} {$setc TARGET_RT_LITTLE_ENDIAN := FALSE} {$elifc defined FPC_LITTLE_ENDIAN} {$setc TARGET_RT_BIG_ENDIAN := FALSE} {$setc TARGET_RT_LITTLE_ENDIAN := TRUE} {$elsec} {$error Neither FPC_BIG_ENDIAN nor FPC_LITTLE_ENDIAN are defined.} {$endc} {$setc ACCESSOR_CALLS_ARE_FUNCTIONS := TRUE} {$setc CALL_NOT_IN_CARBON := FALSE} {$setc OLDROUTINENAMES := FALSE} {$setc OPAQUE_TOOLBOX_STRUCTS := TRUE} {$setc OPAQUE_UPP_TYPES := TRUE} {$setc OTCARBONAPPLICATION := TRUE} {$setc OTKERNEL := FALSE} {$setc PM_USE_SESSION_APIS := TRUE} {$setc TARGET_API_MAC_CARBON := TRUE} {$setc TARGET_API_MAC_OS8 := FALSE} {$setc TARGET_API_MAC_OSX := TRUE} {$setc TARGET_CARBON := TRUE} {$setc TARGET_CPU_68K := FALSE} {$setc TARGET_CPU_MIPS := FALSE} {$setc TARGET_CPU_SPARC := FALSE} {$setc TARGET_OS_UNIX := FALSE} {$setc TARGET_OS_WIN32 := FALSE} {$setc TARGET_RT_MAC_68881 := FALSE} {$setc TARGET_RT_MAC_CFM := FALSE} {$setc TARGET_RT_MAC_MACHO := TRUE} {$setc TYPED_FUNCTION_POINTERS := TRUE} {$setc TYPE_BOOL := FALSE} {$setc TYPE_EXTENDED := FALSE} {$setc TYPE_LONGLONG := TRUE} uses MacTypes,CFBase,CFRunLoop,AUComponent; {$endc} {not MACOSALLINCLUDE} {$ALIGN POWER} //CF_ASSUME_NONNULL_BEGIN { ============================================================================= } {! @enum @constant kAUParameterListener_AnyParameter A wildcard value for an AudioUnitParameterID. Note that this is only valid when sending a notification (with AUParameterListenerNotify), not when registering to receive one. } const kAUParameterListener_AnyParameter = $FFFFFFFF; {! @enum AudioUnitEventType @abstract Types of Audio Unit Events. @constant kAudioUnitEvent_ParameterValueChange The event is a change to a parameter value @constant kAudioUnitEvent_BeginParameterChangeGesture The event signifies a gesture (e.g. mouse-down) beginning a potential series of related parameter value change events. @constant kAudioUnitEvent_EndParameterChangeGesture The event signifies a gesture (e.g. mouse-up) ending a series of related parameter value change events. @constant kAudioUnitEvent_PropertyChange The event is a change to a property value. } type AudioUnitEventType = UInt32; AudioUnitEventTypePtr = ^AudioUnitEventType; const kAudioUnitEvent_ParameterValueChange = 0; kAudioUnitEvent_BeginParameterChangeGesture = 1; kAudioUnitEvent_EndParameterChangeGesture = 2; kAudioUnitEvent_PropertyChange = 3; { ============================================================================= } {! @typedef AUParameterListenerRef @abstract An object which receives notifications of Audio Unit parameter value changes. @discussion } type AUListenerBase = record end; AUParameterListenerRef = ^AUListenerBase; // opaque // old-style listener, may not be passed to new functions {! @typedef AUEventListenerRef @abstract An object which receives Audio Unit events. @discussion An AUEventListenerRef may be passed to API's taking an AUEventListenerRef as an argument. } type AUEventListenerRef = AUParameterListenerRef; // new-style listener, can be passed to both old and new functions {! @struct AudioUnitEvent @abstract Describes a change to an Audio Unit's state. @field mEventType The type of event. @field mArgument Specifies the parameter or property which has changed. } type AudioUnitEvent = record mEventType: AudioUnitEventType; mArgument: record case byte of 0: (mParameter: AudioUnitParameter); // for parameter value change, begin and end gesture 1: (mProperty: AudioUnitProperty); // for kAudioUnitEvent_PropertyChange end end; AudioUnitEventPtr = ^AudioUnitEvent; {! @typedef AUParameterListenerProc @abstract A function called when a parameter value changes. @param inUserData The value passed to AUListenerCreate when the callback function was installed. @param inObject The object which generated the parameter change. @param inParameter Signifies the parameter whose value changed. @param inValue The parameter's new value. } type AUParameterListenerProc = procedure( inUserData: UnivPtr {__nullable}; inObject: UnivPtr {__nullable}; const (*var*) inParameter: AudioUnitParameter; inValue: AudioUnitParameterValue ); {! @typedef AUEventListenerProc @abstract A function called when an Audio Unit event occurs. @param inUserData The value passed to AUListenerCreate when the callback function was installed. @param inObject The object which generated the parameter change. @param inEvent The event which occurred. @param inEventHostTime The host time at which the event occurred. @param inParameterValue If the event is parameter change, the parameter's new value (otherwise, undefined). } type AUEventListenerProc = procedure( inUserData: UnivPtr {__nullable}; inObject: UnivPtr {__nullable}; const (*var*) inEvent: AudioUnitEvent; inEventHostTime: UInt64; inParameterValue: AudioUnitParameterValue ); { ============================================================================= } {! @functiongroup AUListener } {! @function AUListenerCreate @abstract Create an object for fielding notifications when AudioUnit parameter values change. @param inProc Function called when the parameter's value changes. @param inUserData A reference value for the use of the callback function. @param inRunLoop The run loop on which the callback is called. If NULL, CFRunLoopGetCurrent() is used. @param inRunLoopMode The run loop mode in which the callback's underlying run loop source will be attached. If NULL, kCFRunLoopDefaultMode is used. @param inNotificationInterval The minimum time interval, in seconds, at which the callback will be called. If multiple parameter value changes occur within this time interval, the listener will only receive a notification for the last value change that occurred before the callback. If inNotificationInterval is 0, the inRunLoop and inRunLoopMode arguments are ignored, and the callback will be issued immediately, on the thread on which the parameter was changed. @param outListener On successful return, an AUParameterListenerRef. @discussion Note that only parameter changes issued through AUParameterSet will generate notifications to listeners; thus, in most cases, AudioUnit clients should use AUParameterSet in preference to AudioUnitSetParameter. } function AUListenerCreate( inProc: AUParameterListenerProc; inUserData: UnivPtr; inRunLoop: CFRunLoopRef {__nullable}; inRunLoopMode: CFStringRef {__nullable}; inNotificationInterval: Float32; var outListener: AUParameterListenerRef {__nullable * __nonnull} ): OSStatus; external name '_AUListenerCreate'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUListenerDispose @abstract Dispose a parameter listener object. @param inListener The parameter listener to dispose. @discussion } function AUListenerDispose( inListener: AUParameterListenerRef ): OSStatus; external name '_AUListenerDispose'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUListenerAddParameter @abstract Connect a parameter to a listener. @param inListener The parameter listener which will receive the callback. @param inObject The object which is interested in the value of the parameter. This will be passed as the inObject parameter to the listener callback function when the parameter changes. @param inParameter The parameter whose value changes are to generate callbacks. @discussion Associates an arbitrary object (often a user interface widget) with an AudioUnitParameter, and delivers notifications to the specified listener, telling it that the object needs to be informed of the parameter's value change. } function AUListenerAddParameter( inListener: AUParameterListenerRef; inObject: UnivPtr {__nullable}; const (*var*) inParameter: AudioUnitParameter ): OSStatus; external name '_AUListenerAddParameter'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUListenerRemoveParameter @abstract Remove a parameter/listener connection. @param inListener The parameter listener to stop receiving callbacks. @param inObject The object which is no longer interested in the value of the parameter. @param inParameter The parameter whose value changes are to stop generating callbacks. @discussion } function AUListenerRemoveParameter( inListener: AUParameterListenerRef; inObject: UnivPtr {__nullable}; const (*var*) inParameter: AudioUnitParameter ): OSStatus; external name '_AUListenerRemoveParameter'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUParameterSet @abstract Set an AudioUnit parameter value and notify listeners. @param inSendingListener A parameter listener generating the change and which does not want to receive a callback as a result of it. May be NULL. @param inSendingObject The object generating the change and which does not want to receive a callback as a result of it. NULL is treated specially when inListener is non-null; it signifies that none of the specified listener's objects will receive notifications. @param inParameter The parameter being changed. @param inValue The new value of the parameter. @param inBufferOffsetInFrames The offset into the next rendered buffer at which the parameter change will take effect. @discussion Calls AudioUnitSetParameter, and performs/schedules notification callbacks to all parameter listeners, for that parameter -- except that no callback will be generated to the inListener/inObject pair. } function AUParameterSet( inSendingListener: AUParameterListenerRef {__nullable}; inSendingObject: UnivPtr {__nullable}; const (*var*) inParameter: AudioUnitParameter; inValue: AudioUnitParameterValue; inBufferOffsetInFrames: UInt32 ): OSStatus; external name '_AUParameterSet'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUParameterListenerNotify @abstract Notify listeners of a past parameter change. @param inSendingListener A parameter listener generating the change and which does not want to receive a callback as a result of it. May be NULL. @param inSendingObject The object generating the change and which does not want to receive a callback as a result of it. NULL is treated specially when inListener is non-null; it signifies that none of the specified listener's objects will receive notifications. @param inParameter The parameter which was changed. @discussion Performs and schedules the notification callbacks of AUParameterSet, without actually setting an AudioUnit parameter value. Clients scheduling ramped parameter changes to AudioUnits must make this call dynamically during playback in order for AudioUnitViews to be updated. When the view's listener receives a notification, it will be passed the current value of the parameter. A special meaning is applied if the mParameterID value of inParameter is equal to kAUParameterListener_AnyParameter. In this case, ANY listener for ANY parameter value changes on the specified AudioUnit will be notified of the current value of that parameter. } function AUParameterListenerNotify( inSendingListener: AUParameterListenerRef {__nullable}; inSendingObject: UnivPtr {__nullable}; const (*var*) inParameter: AudioUnitParameter ): OSStatus; external name '_AUParameterListenerNotify'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) { ============================================================================= } {! @functiongroup AUEventListener } {! @function AUEventListenerCreate @abstract Creates an Audio Unit event listener. @param inProc Function called when an event occurs. @param inUserData A reference value for the use of the callback function. @param inRunLoop The run loop on which the callback is called. If NULL, CFRunLoopGetCurrent() is used. @param inRunLoopMode The run loop mode in which the callback's underlying run loop source will be attached. If NULL, kCFRunLoopDefaultMode is used. @param inNotificationInterval The minimum time interval, in seconds, at which the callback will be called. @param inValueChangeGranularity Determines how parameter value changes occurring within this interval are queued; when an event follows a previous one by a smaller time interval than the granularity, then the listener will only be notified for the second parameter change. @param outListener On successful return, an AUEventListenerRef. @discussion See the discussion of AUEventListenerCreateWithDispatchQueue. } function AUEventListenerCreate( inProc: AUEventListenerProc; inUserData: UnivPtr {__nullable}; inRunLoop: CFRunLoopRef {__nullable}; inRunLoopMode: CFStringRef {__nullable}; inNotificationInterval: Float32 { seconds }; inValueChangeGranularity: Float32 { seconds }; var outListener: AUEventListenerRef {__nullable * __nonnull} ): OSStatus; external name '_AUEventListenerCreate'; (* API_AVAILABLE(macos(10.3), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUEventListenerAddEventType @abstract Begin delivering a particular type of events to a listener. @param inListener The parameter listener which will receive the events. @param inObject The object which is interested in the value of the parameter. This will be passed as the inObject parameter to the listener callback function when the parameter changes. @param inEvent The type of event to listen for. @result An OSStatus error code. } function AUEventListenerAddEventType( inListener: AUEventListenerRef; inObject: UnivPtr {__nullable}; const (*var*) inEvent: AudioUnitEvent ): OSStatus; external name '_AUEventListenerAddEventType'; (* API_AVAILABLE(macos(10.3), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUEventListenerRemoveEventType @abstract Stop delivering a particular type of events to a listener. @param inListener The parameter listener to stop receiving events. @param inObject The object which is no longer interested in the value of the parameter. @param inEvent The type of event to stop listening for. @result An OSStatus error code. } function AUEventListenerRemoveEventType( inListener: AUEventListenerRef; inObject: UnivPtr {__nullable}; const (*var*) inEvent: AudioUnitEvent ): OSStatus; external name '_AUEventListenerRemoveEventType'; (* API_AVAILABLE(macos(10.3), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUEventListenerNotify @abstract Deliver an AudioUnitEvent to all listeners registered to receive it. @discussion This is only to be used for notifications about parameter changes (and gestures). It can not be used for notifying changes to property values as these are internal to an audio unit and should not be issued outside of the audio unit itself. @param inSendingListener A parameter listener generating the change and which does not want to receive a callback as a result of it. May be NULL. @param inSendingObject The object generating the change and which does not want to receive a callback as a result of it. NULL is treated specially when inListener is non-null; it signifies that none of the specified listener's objects will receive notifications. @param inEvent The event to be delivered. @result An OSStatus error code. } function AUEventListenerNotify( inSendingListener: AUEventListenerRef {__nullable}; inSendingObject: UnivPtr {__nullable}; const (*var*) inEvent: AudioUnitEvent ): OSStatus; external name '_AUEventListenerNotify'; (* API_AVAILABLE(macos(10.3), ios(6.0), watchos(2.0), tvos(9.0)) *) { ============================================================================= } {! @functiongroup Parameter value utilities } {! @function AUParameterValueFromLinear @abstract Converts a linear value to a parameter value according to the parameter's units. @param inLinearValue The linear value (0.0-1.0) to convert. @param inParameter The parameter, including its Audio Unit, that will define the conversion of the supplied linear value to a value that is natural to that parameter. @result The converted parameter value, in the parameter's natural units. @discussion } function AUParameterValueFromLinear( inLinearValue: Float32 { // 0-1 }; const (*var*) inParameter: AudioUnitParameter ): AudioUnitParameterValue; external name '_AUParameterValueFromLinear'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) {! @function AUParameterValueToLinear @abstract Converts a parameter value to a linear value according to the parameter's units. @param inParameterValue The value in the natural units of the specified parameter. @param inParameter The parameter, including its Audio Unit, that will define the conversion of the supplied parameter value to a corresponding linear value. @result A number 0.0-1.0. @discussion } function AUParameterValueToLinear( inParameterValue: AudioUnitParameterValue; const (*var*) inParameter: AudioUnitParameter ): Float32; external name '_AUParameterValueToLinear'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) // returns 0-1 {! @function AUParameterFormatValue @abstract Format a parameter value into a string. @param inParameterValue The parameter value to be formatted. @param inParameter The Audio Unit, scope, element, and parameter whose value this is. @param inTextBuffer The character array to receive the formatted text. Should be at least 32 characters. @param inDigits The resolution of the string (see example above). @result inTextBuffer @discussion Formats a floating point value into a string. Computes a power of 10 to which the value will be rounded and displayed as follows: if the the parameter is logarithmic (Hertz), the number of significant digits is inDigits - pow10(inParameterValue) + 1. Otherwise, it is inDigits - pow10(maxValue - minValue) + 1. Example for inDigits=3: 
        pow10   range           digits after decimal place display
        -2      .0100-.0999     4
        -1      .100-.999       3
        0       1.00-9.99       2
        1       10.0-99.9       1
        2       100-999         0
        3       1000-9990       -1
        4       10000-99900     -2
} function AUParameterFormatValue( inParameterValue: Float64; const (*var*) inParameter: AudioUnitParameter; var inTextBuffer: char; inDigits: UInt32 ): CStringPtr; external name '_AUParameterFormatValue'; (* API_AVAILABLE(macos(10.2), ios(6.0), watchos(2.0), tvos(9.0)) *) //CF_ASSUME_NONNULL_END {$ifc not defined MACOSALLINCLUDE or not MACOSALLINCLUDE} end. {$endc} {not MACOSALLINCLUDE}