decoding ERR

[JatosDetking]

when decoding it gives me this error
Error(rawValue: -4)

[rafus15]

Did you fix this? i'm having the same error

[ydnar]

What are you trying to decode? Can you share reproducible code?

[rafus15]

I'm trying to decode oga files from Telegram.
My first try was obviously flawed because i was not chunking my file (this is a test function, excuse the code mess jeje)

func play(audioUrl: URL) throws {
      var encodingFormat = AVAudioFormat(
          opusPCMFormat: .float32,
          sampleRate: .opus48khz,
        channels: 1
      )
      var opusDecoder = try Opus.Decoder(format: encodingFormat!)
      print("decoder created!")
      let audioData = try Data(contentsOf: audioUrl)
      let mainMixer = audioEngine.mainMixerNode
      audioEngine.attach(audioFilePlayer)
      audioEngine.connect(audioFilePlayer, to: mainMixer, format: encodingFormat!)
      try audioEngine.start()
      audioFilePlayer.play()
      let dec = try opusDecoder.decode(audioData)
      audioFilePlayer.scheduleBuffer(dec)
}

Later looking through the other issues in this repo i found out that i have to parse individual packets and schedule the generated buffers. But i keep getting the same errors for some chunks and estrange sounds.

this is my current code:

func play(audioUrl: URL) throws {
                    var encodingFormat = AVAudioFormat(
            opusPCMFormat: .float32,
            sampleRate: .opus48khz,
          channels: 1
        )
        var opusDecoder = try Opus.Decoder(format: encodingFormat!)
        print("decoder created!")
        let audioData = try Data(contentsOf: audioUrl)
        let mainMixer = audioEngine.mainMixerNode
        audioEngine.attach(audioFilePlayer)
        audioEngine.connect(audioFilePlayer, to: mainMixer, format: encodingFormat!)
       try audioEngine.start()
        var buf = AVAudioPCMBuffer(pcmFormat: encodingFormat!, frameCapacity: 100000)
        audioFilePlayer.play()
        let frameSizeInBytes = 78
var offset = 312
                   print("file size: \(audioData.count)")
                   print("frame size: \(frameSizeInBytes)")
                   while offset < audioData.count {
                       let upperLimit = min(offset + frameSizeInBytes, audioData.count)
                       let opusFrame = audioData[offset..<upperLimit]
                       do {
                           try opusFrame.withUnsafeBytes { ptr in
                               let input = ptr.bindMemory(to: UInt8.self)
                               try opusDecoder.decode(input, to:buf!)
                               audioFilePlayer.scheduleBuffer(buf!)
                           }     
                       } catch {
                           print("failed decoding opus frame ---------- \(error)")
                       }
                       offset += frameSizeInBytes
                   }
        }

Thank you for your time and effort!

EDIT:

As url you can use https://sample-files-online.com/samples/countdownload/280 this sample file