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164 lines
9.3 KiB
C
164 lines
9.3 KiB
C
3 months ago
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// Copyright (c) Meta Platforms, Inc. and affiliates.
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#import <Foundation/Foundation.h>
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#import <AVFoundation/AVFoundation.h>
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NS_ASSUME_NONNULL_BEGIN
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//! Project version number for LofeltHaptics.
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FOUNDATION_EXPORT double LofeltHapticsVersionNumber;
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//! Project version string for LofeltHaptics.
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FOUNDATION_EXPORT const unsigned char LofeltHapticsVersionString[];
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//! Custom error domain
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extern NSString *_Nonnull const LofeltErrorDomain;
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/*!
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@class LofeltHaptics
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@brief The LofeltHaptics class
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@discussion Defines the API of Lofelt SDK for iOS.
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The LofeltHaptics class is not thread safe and can only be used from
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the main thread.
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When the app is put into the background, Core Haptics will not allow
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playing any haptics. LofeltHaptics will detect this situation and cease
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all activity.
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When the app is put into the foreground again, Core Haptics will allow
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playing haptics again, and LofeltHaptics re-initalizes itself. However,
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haptics that were interrupted when the app was backgrounded do not
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automatically resume and need to be started again by calling @c play().
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@author Joao Freire, James Kneafsey, Thomas McGuire, Tomash GHz
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@copyright © 2020 Lofelt. All rights reserved.
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*/
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@interface LofeltHaptics : NSObject
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{
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void *_controller;
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id<NSObject> _foregroundNotificationObserver;
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id<NSObject> _backgroundNotificationObserver;
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}
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/*! @abstract Checks if the iPhone meets the minimum requirements
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@discussion This allows for a runtime check on iPhones that won't
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meet the requirements for Lofelt Haptics.
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@return Whether the iPhone supports or not Lofelt Haptics
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*/
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+ (BOOL)deviceMeetsMinimumRequirement;
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- (instancetype)init NS_UNAVAILABLE;
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/*! @abstract Creates an instance of LofeltHaptics.
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@discussion There should only be one instance of `LofeltHaptics` created in a given application.
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@param error If the initialization fails, this will be set to a valid NSError describing the error.
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*/
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- (nullable instancetype)initAndReturnError:(NSError **)error API_AVAILABLE(ios(13)) NS_SWIFT_NAME(init());
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/*! @abstract Loads a haptic clip from string data.
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@discussion The data must be in a valid Lofelt JSON format.
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If a haptic clip is currently playing, it will be stopped.
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@param data The Lofelt JSON format string.
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@param error If the load operation fails, this will be set to a valid NSError describing the error.
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@return Whether the operation succeeded
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*/
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- (BOOL)load:(NSString *_Nonnull)data error:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract A version of @c load() taking @c NSData instead of @c NSString.
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@discussion This method can be faster than @c load(), as it avoids string conversions.
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@param data The .haptic clip, as UTF-8 encoded JSON string without a null terminator.
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@param error If the load operation fails, this will be set to a valid NSError describing the error.
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@return Whether the operation succeeded
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*/
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- (BOOL)loadFromData:(NSData *_Nonnull)data error:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Plays a loaded haptic clip.
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@discussion The data must be preloaded using @c load() .
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Only one haptic clip can play at a time.
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Playback will start from the beginning of the haptic clip, or from the seek
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position if seek() has been called before.
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Calling play() if the clip is already playing has no effect.
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@param error If the play operation fails, this will be set to a valid NSError describing the error.
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@return Whether the operation succeeded
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*/
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- (BOOL)play:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Stops the haptic clip that is currently playing.
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@discussion The call is ignored if no clip is loaded or no clip is playing.
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@param error If the stop operation fails, this will be set to a valid NSError describing the error.
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@return Whether the operation succeeded
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*/
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- (BOOL)stop:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Jumps to a time position in the haptic clip
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@discussion The playback state (playing or stopped) will not be changed unless seeking
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beyond the end of the haptic clip. Seeking beyond the end of the clip will stop
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playback.
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Seeking to a negative position will start playback after a delay.
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@param time The new position within the clip, as seconds from the beginning of the clip
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@param error If the seek operation fails, this will be set to a valid NSError describing the error.
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@return Whether the operation succeeded
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*/
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- (BOOL)seek:(float)time error:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Multiplies the amplitude of every breakpoint of the clip with the given
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multiplication factor
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@discussion In other words, this function applies a gain (for factors greater than 1.0)
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or an attenuation (for factors less than 1.0) to the clip.
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If the resulting amplitude of a breakpoint is greater than 1.0, it is
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clipped to 1.0. The amplitude is clipped hard, no limiter is used.
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The clip needs to be loaded with @c load() first. Loading a clip resets
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the multiplication factor back to the default of 1.0.
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If no clip is currently playing, the multiplication will take effect
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once @c play() is called. If a clip is currently playing, the multiplication
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will take effect immediately.
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@param amplitudeMultiplication The factor by which each amplitude will be multiplied. This value is a
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multiplication factor, it is not a dB value. The factor needs to be 0
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or greater.
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@param error If the operation fails, this will be set to a valid NSError describing
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the error. An error can for example happen if no clip is loaded, or if
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the factor is outside of the valid range.
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@return Whether the operation succeeded
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*/
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- (BOOL)setAmplitudeMultiplication:(float)amplitudeMultiplication error:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Adds the given shift to the frequency of every breakpoint in the clip,
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including the emphasis.
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@discussion In other words, this function shifts all frequencies of the clip.
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If the resulting frequency of a breakpoint is smaller than 0.0 or
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greater than 1.0, it is clipped to that range. The frequency is
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clipped hard, no limiter is used.
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The clip needs to be loaded with @c load() first. Loading a clip resets
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the shift back to the default of 0.0.
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If no clip is currently playing, the shift will take effect once @c play()
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is called. If a clip is currently playing, the shift will take effect
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immediately.
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@param shift The amount by which each frequency should be shifted. This number is added
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to each frequency value. The shift needs to be between -1.0 and 1.0.
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@param error If the operation fails, this will be set to a valid NSError describing
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the error. An error can for example happen if no clip is loaded, or if
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the shift is outside of the valid range.
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@return Whether the operation succeeded
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*/
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- (BOOL)setFrequencyShift:(float)shift error:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Sets the playback to repeat from the start at the end of the clip.
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@discussion Changes done with this function are only applied when @c play() is called.
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When @c load() is called, looping is always disabled.
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Playback will always start at the beginning of the clip, even if
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@c seek() was used to jump to a different clip position before.
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@param enabled When true, looping is set enabled; false disables looping.
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@param error If the loop operation fails, this will be set to a valid NSError describing the error.
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@return Whether the operation succeeded
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*/
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- (BOOL)loop:(BOOL)enabled error:(NSError *_Nullable *_Nullable)error API_AVAILABLE(ios(13));
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/*! @abstract Returns the duration of the loaded clip
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@discussion It will return 0.0 for an invalid clip
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@return Duration of the loaded clip
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*/
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- (float)getClipDuration;
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@end
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NS_ASSUME_NONNULL_END
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