我正在嘗試AVAudioEngine播放 wav 檔案。我嘗試以幾種不同的方式來做，但沒有任何效果。
嘗試 1
...
private var audioEngine: AVAudioEngine = AVAudioEngine()
private var mixer: AVAudioMixerNode = AVAudioMixerNode()
private var audioFilePlayer: AVAudioPlayerNode = AVAudioPlayerNode()
func Play1() {
guard let filePath = Bundle.main.url(forResource: "testwav", withExtension: "wav", subdirectory: "res") else {
print("file not found")
return
}
print("\(filePath)")
guard let audioFile = try? AVAudioFile(forReading: filePath) else{ return }
let audioFormat = audioFile.processingFormat
let audioFrameCount = UInt32(audioFile.length)
guard let audioFileBuffer = AVAudioPCMBuffer(pcmFormat: audioFormat, frameCapacity: audioFrameCount) else{ return }
do{
try audioFile.read(into: audioFileBuffer)
} catch{
print("over")
}
let mainMixer = audioEngine.mainMixerNode
audioEngine.attach(audioFilePlayer)
audioEngine.connect(audioFilePlayer, to:mainMixer, format: audioFileBuffer.format)
audioEngine.connect(mainMixer, to:audioEngine.outputNode, format: audioFileBuffer.format)
try? audioEngine.start()
audioFilePlayer.play()
audioFilePlayer.scheduleBuffer(audioFileBuffer, at: nil, options:AVAudioPlayerNodeBufferOptions.loops)
}
...
嘗試 2
...
private var audioEngine: AVAudioEngine = AVAudioEngine()
private var mixer: AVAudioMixerNode = AVAudioMixerNode()
private var audioFilePlayer: AVAudioPlayerNode = AVAudioPlayerNode()
func Play2() {
DispatchQueue.global(qos: .background).async {
self.audioEngine.attach(self.mixer)
self.audioEngine.connect(self.mixer, to: self.audioEngine.outputNode, format: nil)
// !important - start the engine *before* setting up the player nodes
try! self.audioEngine.start()
let audioPlayer = AVAudioPlayerNode()
self.audioEngine.attach(audioPlayer)
// Notice the output is the mixer in this case
self.audioEngine.connect(audioPlayer, to: self.mixer, format: nil)
guard let fileUrl = Bundle.main.url(forResource: "testwav", withExtension: "wav", subdirectory: "res") else {
// guard let url = Bundle.main.url(forResource: "audiotest", withExtension: "mp3", subdirectory: "res") else {
print("mp3 not found")
return
}
do {
let file = try AVAudioFile(forReading: fileUrl)
audioPlayer.scheduleFile(file, at: nil, completionHandler: nil)
audioPlayer.play(at: nil)
} catch let error {
print(error.localizedDescription)
}
}
}
...
...
private var audioEngine: AVAudioEngine = AVAudioEngine()
private var mixer: AVAudioMixerNode = AVAudioMixerNode()
private var audioFilePlayer: AVAudioPlayerNode = AVAudioPlayerNode()
func Play3() {
DispatchQueue.global(qos: .background).async {
self.audioEngine = AVAudioEngine()
_ = self.audioEngine.mainMixerNode
self.audioEngine.prepare()
do {
try self.audioEngine.start()
} catch {
print(error)
}
guard let url = Bundle.main.url(forResource: "testwav", withExtension: "wav", subdirectory: "res") else {
// guard let url = Bundle.main.url(forResource: "audiotest", withExtension: "mp3", subdirectory: "res") else {
print("mp3 not found")
return
}
let player = AVAudioPlayerNode()
player.volume = 1.0
do {
let audioFile = try AVAudioFile(forReading: url)
let format = audioFile.processingFormat
print(format)
self.audioEngine.attach(player)
self.audioEngine.connect(player, to: self.audioEngine.mainMixerNode, format: format)
player.scheduleFile(audioFile, at: nil, completionHandler: nil)
} catch let error {
print(error.localizedDescription)
}
player.play()
}
}
...
還應該提到的是，沒有錯誤，在除錯時我看到所有方法都被執行并且一切正常，但我沒有聽到聲音播放......
我究竟做錯了什么？
uj5u.com熱心網友回復：
嘗試使用以下方法激活您的音頻會話：
func setActive(_ active: Bool, options: AVAudioSession.SetActiveOptions = []) throws.
請注意，如果另一個活動音頻會話的優先級高于您的優先級（例如，電話），并且兩個音頻會話都不允許混音，則嘗試激活您的音頻會話將失敗。停用具有正在運行的音頻物件的音頻會話會停止它們、停用會話并回傳AVAudioSession.ErrorCode.isBusy錯誤。
轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/329701.html