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AVAudioPlayer+LambdaKit.swift
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AVAudioPlayer+LambdaKit.swift
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//
// AVAudioPlayer+LambdaKit.swift
// Created by Matias Pequeno on 9/23/15.
//
// Copyright (c) 2015 Lyft (http://lyft.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import Foundation
import AVFoundation
public typealias LKDidFinishPlayingClosure = (AVAudioPlayer, Bool) -> Void
public typealias LKDecodeErrorDidOccurClosure = (AVAudioPlayer, NSError?) -> Void
// A global var to produce a unique address for the assoc object handle
private var associatedEventHandle: UInt8 = 0
/// AVAudioPlayer with closure callback(s).
///
/// Example:
///
/// ```swift
/// let player = try? AVAudioPlayer(contentsOfURL: soundURL)
/// player?.play { player, success in
/// // deactivate audio session
/// }
/// ```
extension AVAudioPlayer: AVAudioPlayerDelegate {
private var closuresWrapper: ClosuresWrapper {
get {
if let wrapper = objc_getAssociatedObject(self, &associatedEventHandle) as? ClosuresWrapper {
return wrapper
}
let closuresWrapper = ClosuresWrapper()
self.closuresWrapper = closuresWrapper
return closuresWrapper
}
set {
self.delegate = self
objc_setAssociatedObject(self, &associatedEventHandle, newValue,
objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
/// The closure that fires when a sound has finished playing. This method is NOT called if the player is
/// stopped due to an interruption.
public var didFinishPlaying: LKDidFinishPlayingClosure? {
set { self.closuresWrapper.didFinishPlaying = newValue }
get { return self.closuresWrapper.didFinishPlaying }
}
/// The closure that fires if an error occurs while decoding it will be reported to the delegate.
public var decodeErrorDidOccur: LKDecodeErrorDidOccurClosure? {
set { self.closuresWrapper.decodeErrorDidOccur = newValue }
get { return self.closuresWrapper.decodeErrorDidOccur }
}
/// Plays a sound asynchronously.
///
/// - parameter didFinishPlaying: Closure to be invoked when audio finishes playing. This won't be invoked
/// if the player stopped due to an interruption.
///
/// - returns: Returns `true` on success, or `false` on failure.
public func play(didFinishPlaying closure: @escaping LKDidFinishPlayingClosure) -> Bool {
self.didFinishPlaying = closure
return self.play()
}
// MARK: AVAudioPlayerDelegate implementation
public func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
self.closuresWrapper.didFinishPlaying?(player, flag)
}
public func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
self.closuresWrapper.decodeErrorDidOccur?(player, error as NSError?)
}
}
private final class ClosuresWrapper {
fileprivate var didFinishPlaying: LKDidFinishPlayingClosure?
fileprivate var decodeErrorDidOccur: LKDecodeErrorDidOccurClosure?
}