音頻麥克風從正在播放不連貫和聽起來像空氣吹進麥克風

我使用錄製音頻以下：音頻麥克風從正在播放不連貫和聽起來像空氣吹進麥克風

localInput?.installTap(onBus: 0, bufferSize: 4096, format: localInputFormat) { 
     (buffer, time) -> Void in 

     let audioBuffer = self.audioBufferToBytes(audioBuffer: buffer) 
     let output = self.outputStream!.write(audioBuffer, maxLength: Int(buffer.frameLength)) 

     if output > 0 { 
      print("\(#file) > \(#function) > \(output) bytes written from queue \(self.currentQueueName())") 
     } 
     else if output == -1 { 
      let error = self.outputStream!.streamError 
      print("\(#file) > \(#function) > Error writing to stream: \(error?.localizedDescription)") 
     } 
    }

凡我localInputFormat如下：

self.localInput = self.localAudioEngine.inputNode 
self.localAudioEngine.attach(self.localAudioPlayer) 
self.localInputFormat = self.localInput?.inputFormat(forBus: 0) 
self.localAudioEngine.connect(self.localAudioPlayer, to: self.localAudioEngine.mainMixerNode, format: self.localInputFormat)

功能audioBufferToBytes如下：

func audioBufferToBytes(audioBuffer: AVAudioPCMBuffer) -> [UInt8] { 
    let srcLeft = audioBuffer.floatChannelData![0] 
    let bytesPerFrame = audioBuffer.format.streamDescription.pointee.mBytesPerFrame 
    let numBytes = Int(bytesPerFrame * audioBuffer.frameLength) 

    // initialize bytes by 0 
    var audioByteArray = [UInt8](repeating: 0, count: numBytes) 

    srcLeft.withMemoryRebound(to: UInt8.self, capacity: numBytes) { srcByteData in 
     audioByteArray.withUnsafeMutableBufferPointer { 
      $0.baseAddress!.initialize(from: srcByteData, count: numBytes) 
     } 
    } 

    return audioByteArray 
}

在另一臺設備上，當我收到數據我必須將其轉換回來。

func bytesToAudioBuffer(_ buf: [UInt8]) -> AVAudioPCMBuffer { 

    let fmt = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 44100, channels: 1, interleaved: true) 
    let frameLength = UInt32(buf.count)/fmt.streamDescription.pointee.mBytesPerFrame 

    let audioBuffer = AVAudioPCMBuffer(pcmFormat: fmt, frameCapacity: frameLength) 
    audioBuffer.frameLength = frameLength 

    let dstLeft = audioBuffer.floatChannelData![0] 

    buf.withUnsafeBufferPointer { 
     let src = UnsafeRawPointer($0.baseAddress!).bindMemory(to: Float.self, capacity: Int(frameLength)) 
     dstLeft.initialize(from: src, count: Int(frameLength)) 
    } 

    return audioBuffer 
}

最後，我們播放音頻數據：那麼，因爲它是收到了通過以下運行

   self.audioPlayerQueue.async { 
        self.peerAudioPlayer.scheduleBuffer(audioBuffer) 

        if (!self.peerAudioPlayer.isPlaying && self.localAudioEngine.isRunning) { 
         self.peerAudioPlayer.play() 
        } 
       }

然而，無論是揚聲器我剛剛聽到什麼聲音就像是有人竊聽每半麥克風 - 第二（ISH）。不是他們真的在說什麼我想這是由於我從一個音頻緩衝區轉換爲字節並返回，但我不確定。有沒有人看到上述問題？

感謝。

來源

2017-03-09 Kember

如果有人有興趣的解決方案，基本的問題是，在記錄設備上的音頻爲17640個字節，但是到流，它打破它成小塊，並在接收設備上，我不得不讀的第一17640字節，然後播放音頻。不要播放收到的每一小部分數據。

來源

2017-03-29 16:15:15 Kember

音頻麥克風從正在播放不連貫和聽起來像空氣吹進麥克風

回答

相關問題