从 Firebase 播放音频文件不起作用

Question

我（未成功）尝试使用 AVAudioPlayer 播放存储在 Firebase 中的音频文件。

我收到以下错误消息：创建音频播放器时出错：操作无法完成。 （操作系统状态错误 2003334207。）

这是我的音频播放器视图模型的代码：

class AudioPlayerViewModel: ObservableObject {
    
    private var audioPlayer: AVAudioPlayer?
    
    func playAudioFromUrl(from storagePath: String) {
        let storage = Storage.storage()
        let storageRef = storage.reference()
        let audioRef = storageRef.child(storagePath)
        
        audioRef.downloadURL { url, error in
            print(audioRef)
            guard let audioURL = url, error == nil else {
                print("Error fetching audio URL: \(error?.localizedDescription ?? "")")
                return
            }
            
            print("Audio URL: \(audioURL)")
            print("Audio URL String: \(audioURL.absoluteString)")
            
            do {
                self.audioPlayer = try AVAudioPlayer(contentsOf: audioURL)
                self.audioPlayer?.prepareToPlay()
                self.audioPlayer?.play()
            } catch {
                print("Error creating audio player: \(error.localizedDescription)")
                if let nsError = error as NSError? {
                    print("Error code: \(nsError.code)")
                }
            }
        }
    }
    
    func stopAudio() {
        audioPlayer?.stop()
    }
}

以及我的观点的代码：

struct PlaybackControlsView: View {
    
    var audioPath: String
    
    @ObservedObject private var audioPlayerVM = AudioPlayerViewModel()
    
    var body: some View {
        
        VStack {
            // Add UI elements here, e.g., play and stop buttons
            Button("Play Audio") {
                audioPlayerVM.playAudioFromUrl(from: "Stories/\(audioPath).mp3")
            }
            .padding()
            
            Button("Stop Audio") {
                audioPlayerVM.stopAudio()
            }
            .padding()
        }
    }
}

#Preview {
    PlaybackControlsView(audioPath: "example")
}

不知道我哪里错了。任何帮助将不胜感激。

Answer 1

您可以尝试使用带有 url 的

AVPlayer

来代替

AVAudioPlayer

似乎只播放文件或缓冲区中的音频数据。

class AudioPlayerViewModel2: ObservableObject {
    
    private var audioPlayer: AVPlayer?  // <-- here
    
    func playAudioFromUrl(from storagePath: String) {
        let storage = Storage.storage()
        let storageRef = storage.reference()
        let audioRef = storageRef.child(storagePath)

        audioRef.downloadURL { url, error in
            print(audioRef)
            guard let audioURL = url, error == nil else {
                print("Error fetching audio URL: \(error?.localizedDescription ?? "")")
                return
            }

            print("Audio URL: \(audioURL)")
            print("Audio URL String: \(audioURL.absoluteString)")

            // --- here
            let playerItem = AVPlayerItem(url: audioURL)
            self.audioPlayer = AVPlayer(playerItem: playerItem)
            self.audioPlayer?.volume = 10
            self.audioPlayer?.play()
        }
    }
    
    func stopAudio() {
        audioPlayer?.pause()
    }
}