我想用2种AVPlayer情况下播放多种音频文件，但播放器之一停止一秒钟的一小部分，而不是同时播放的所有音频文件。该方案的逻辑如下：
var player: AVPlayer?将流从我的数据库的音频文件。就其本身而言是完美的播放。
fileprivate var countPlayer: AVPlayer?播放由var player正在播放的当前项目的计数。计为1〜8和对每一个数字我存储/ sandobxing .wav文件本地如1.wav，2.wav ... 8.wav的序列。
当var player的当前时间是在一定的时间，countPlayer被触发，并播放本地文件1.wav之一，2.wav..etc。
问题是，当var countPlayer开始播放时，它使背景AVPlayer，即var player停一秒钟，类似于在此评论中描述的一小部分：
Play multiple Audio Files with AVPlayer
var player: AVPlayer? //plays the song
fileprivate var countPlayer: AVPlayer? // plays the count number of song
private func addBoundaryTimeObserver(tableIndexPath: IndexPath) {
let mediaItem = mediaArray[tableIndexPath.row]
guard let url = URL(string: mediaItem.mediaAudioUrlStringRepresentation ?? "") else {return}
let playerItem = AVPlayerItem(url: url)
player = AVPlayer(playerItem: playerItem)
var timesToTransverse = [NSValue]()
//convert string representation of times elements to array
let timesRecorded: [String] = mediaItem.timesRecorded.components(separatedBy: ",")
// Build boundary times from arrayOfBeats keys
let timeDoubles: [Double] = timesRecorded.compactMap {timeString in
if let second = Double("\(timeString)") {
return second
}
return nil
}
guard timeDoubles.count > 0 else {return} //unexpected
timesToTransverse = timeDoubles.map { second in
let cmtime = CMTime(seconds: second, preferredTimescale: CMTimeScale(NSEC_PER_SEC))
return NSValue(time: cmtime)
}
guard timesToTransverse.count != 0 else {return}
guard let playerCell = tableView.cellForRow(at: IndexPath(row: 0, section: 0)) as? PlayerCell else {return}
startTime = Date().timeIntervalSinceReferenceDate
timeIndex = 0
player?.play()
player?.rate = Float(initialPlaybackRate)
// find the index of time
//reset timeObserverToken
// call a function with the new times sorted
// Queue on which to invoke the callback
let mainQueue = DispatchQueue.main
// Add time observer
timeObserverToken =
player?.addBoundaryTimeObserver(forTimes: timesToTransverse, queue: mainQueue) {
[weak self] in
//because there are no time signature changes, we can simply increment timeIndex with + 1 every time `addBoundaryTimeObserver` completion handler is called and subscript timesToTransverse with timeIndex in order to get the subsequent timeInSeconds
guard let strongSelf = self, strongSelf.timeIndex < timesToTransverse.count else {return}
let timeElement = timesToTransverse[strongSelf.timeIndex]
strongSelf.timeInSeconds = CMTimeGetSeconds(timeElement.timeValue)
//show progress in progressView
let duration = CMTimeGetSeconds(playerItem.duration)
let cmtimeSeconds = CMTime(seconds: strongSelf.timeInSeconds, preferredTimescale: CMTimeScale(NSEC_PER_SEC))
//Total time since timer started, in seconds
strongSelf.timeInSeconds = Date().timeIntervalSinceReferenceDate - strongSelf.startTime
let timeString = String(format: "%.2f", strongSelf.timeInSeconds)
strongSelf.timeString = timeString
//use reminder operator to determine the beat count
let beat = (strongSelf.timeIndex + 1) % 8 == 0 ? 8 : ((strongSelf.timeIndex + 1) % 8)
//play the beat count : 1, 2, ...8
self.preapareToPlayAudio(beatCount: beat)
/*
0: (0 + 1) % 8 = 1
1: (1 + 1) % 8 = 2
6: (6 + 1) % 8 = 7
7: (7 + 1) % 8 = 0
*/
strongSelf.timeIndex += 1
}
}//end addBoundaryTimeObserver
//prepare determine what wav file to play
private func preapareToPlayAudio(beatCount: Int) {
switch beatCount {
case 1:
guard let url = Bundle.main.url(forResource: "1", withExtension: "wav") else {return}
playWith(beatCountURL: url)
//7 more cases go here .....
default: print("unexpected case here")
}
}//end play(beatCount: Int)
private func playWith(beatCountURL: URL) {
let playerItem = AVPlayerItem(url: beatCountURL)
countPlayer = AVPlayer(playerItem: playerItem)
countPlayer?.play()
}
你会使用AVAudioPlayerNode，AVAudioMixerNode，AVAudioEngine会更好。使用这些类，你不会有问题，像你现在所拥有的。它也并不难成立。
您可以检查出我的要点，以发挥你的游乐场，你就需要把音频文件到资源文件夹中的项目导航的声音：https://gist.github.com/standinga/24342d23acfe70dc08cbcc994895f32b
代码工作不停止背景音乐时，声音顶部被触发。
这里也是同样的代码：
import AVFoundation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
class AudioPlayer {
var backgroundAudioFile:AVAudioFile
var topAudioFiles: [AVAudioFile] = []
var engine:AVAudioEngine
var backgroundAudioNode: AVAudioPlayerNode
var topAudioAudioNodes = [AVAudioPlayerNode]()
var mixer: AVAudioMixerNode
var timer: Timer!
var urls: [URL] = []
init (_ url: URL, urls: [URL] = []) {
backgroundAudioFile = try! AVAudioFile(forReading: url)
topAudioFiles = urls.map { try! AVAudioFile(forReading: $0) }
engine = AVAudioEngine()
mixer = AVAudioMixerNode()
engine.attach(mixer)
engine.connect(mixer, to: engine.outputNode, format: nil)
self.urls = urls
backgroundAudioNode = AVAudioPlayerNode()
for _ in topAudioFiles {
topAudioAudioNodes += [AVAudioPlayerNode()]
}
}
func start() {
engine.attach(backgroundAudioNode)
engine.connect(backgroundAudioNode, to: mixer, format: nil)
backgroundAudioNode.scheduleFile(backgroundAudioFile, at: nil, completionHandler: nil)
try! engine.start()
backgroundAudioNode.play()
for node in topAudioAudioNodes {
engine.attach(node)
engine.connect(node, to: mixer, format: nil)
try! engine.start()
}
// simulate rescheduling files played on top of background audio
DispatchQueue.global().async { [unowned self] in
for i in 0..<1000 {
sleep(2)
let index = i % self.topAudioAudioNodes.count
let node = self.topAudioAudioNodes[index]
node.scheduleFile(self.topAudioFiles[index], at: nil, completionHandler: nil)
node.play()
}
}
}
}
let bundle = Bundle.main
let beepLow = bundle.url(forResource: "beeplow", withExtension: "wav")!
let beepMid = bundle.url(forResource: "beepmid", withExtension: "wav")!
let backgroundAudio = bundle.url(forResource: "backgroundAudio", withExtension: "wav")!
let audioPlayer = AudioPlayer(backgroundAudio, urls: [beepLow, beepMid])
audioPlayer.start()