Question

我目前正致力于从Firebase下载.m4a音频格式文件的代码，并允许用户在同一个View Controller中听到音乐播放。通过对SO和其他网站的大量研究，我设法下载了音频，但是当音频应该被播放时，我只能听到静音。事实上，它实际上播放音频剪辑的整个持续时间（例如，音频是6s长，所以用户会听到6s的静态），所以我知道它实际上是在下载一些东西，只是没有播放。< / p>

以下是我的下载功能和播放音乐功能的源代码。我尝试在SO上搜索这个主题，但很少有关于从Firebase下载到iOS的音频的文章（大多数似乎是＆＃34;如何下载图像＆＃34;等等）

非常感谢您提前！萨姆

  //Function to start playing music
  func playMusic(){
    do {
    self.audioPlay = try AVAudioPlayer(contentsOf: self.localSongURL)
    self.audioPlay.delegate = self
    self.audioPlay.prepareToPlay()
    self.audioPlay.play()
    self.audioPlay.volume = 1.0 //I tried adjusting volumes to see if it would make a difference
  } catch {
    createAlert(title: "File Not Found", message: "Audio downloaded cannot be interpereted.")
  }
  }

//Function to download music
//In the Firebase storage, songs are listed underneath an ID, so the "tillAt"s help to parse through 
//the appropriate strings to get the right path for collection
func downloadMusic(){
  let tillAt1 = self.songPath.components(separatedBy: ID + "/")
  let tillAt2 = tillAt1[1].components(separatedBy: ".")
  store = Storage.storage().reference().child(patientID).child(tillAt1[1])

  //From here is where I think the issue is within
  self.localSongURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent(tillAt2[0] + ".m4a")
  store.getData(maxSize: 128 * 1024 * 1024, completion: {(data, error) in
  if let error = error {
    print("Error Here _______________ Level 1")
    print(error)
  } else {
    if let d = data {
      do {
        try d.write(to: self.localSongURL)
      } catch {
        print("Error Here _______________ Level 2")
        print(error)
      }
    }
  }
})
}

从Firebase下载的音频不会产生噪音Swift 4

0 个答案: