流媒體實時音頻

Question

我想要在Android設備上實現實時音頻流功能，該設備通過設備的MIC捕獲音頻並將其發送到服務器。我知道錄音後發送一個音頻文件，但在實時情況下，我需要幫助。可以通過將字節數組連續發送到服務器來完成。如果是這樣，或者如果有其他方式，請分享您的想法。謝謝。

編輯 -

Android客戶端代碼： -

public class Main extends Activity { 
    private MediaRecorder recorder; 

    private final String TAG = "AudioTest"; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     String hostname = "192.168.50.25"; 
     int port = 2004; 

     Socket socket = null; 
     try { 
      socket = new Socket(InetAddress.getByName(hostname), port); 

     } catch (UnknownHostException e) { 

      Log.d(TAG, "Inside UnknownHostException@@@@@@@@@@@@@@@@@@@@@@"); 

      e.printStackTrace(); 
     } catch (IOException e) { 
      Log.d(TAG, "Inside IOException%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"); 

      e.printStackTrace(); 
     } 

     ParcelFileDescriptor pfd = ParcelFileDescriptor.fromSocket(socket); 

     recorder = new MediaRecorder(); 
     recorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
     recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
     recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 

     recorder.setOutputFile(pfd.getFileDescriptor()); 


     try { 
      Log.i(TAG, pfd.getFileDescriptor().toString()); 
     } catch (Exception e) { 
      Log.d(TAG, "Inside MyException################################"); 
     } 

     try { 
      recorder.prepare(); 
     } catch (IllegalStateException e) { 

      e.printStackTrace(); 
     } catch (IOException e) { 

      e.printStackTrace(); 
     } 

     recorder.start(); 

    } 

Java服務器代碼 -

public class Provider { 
    ServerSocket providerSocket; 
    Socket connection = null; 
    ObjectOutputStream out; 
    ObjectInputStream in; 
    String message; 

    Provider() { 
    } 

    void run() { 
     try { 
      // 1. creating a server socket 
      providerSocket = new ServerSocket(2004, 10); 
      // 2. Wait for connection 
      System.out.println("Waiting for connection"); 

      connection = providerSocket.accept(); 
      System.out.println("Connection received from " 
        + connection.getInetAddress().getHostName()); 
      // 3. get Input and Output streams 
      out = new ObjectOutputStream(connection.getOutputStream()); 
      out.flush(); 
      in = new ObjectInputStream(connection.getInputStream()); 
      sendMessage("Connection successful"); 
      // 4. The two parts communicate via the input and output streams 
      do { 
       try { 
        message = (String) in.readObject(); 
        System.out.println("client>" + message); 
        if (message.equals("bye")) 
         sendMessage("bye"); 
       } catch (ClassNotFoundException classnot) { 
        System.err.println("Data received in unknown format"); 
       } 
      } while (!message.equals("bye")); 
     } catch (IOException ioException) { 
      ioException.printStackTrace(); 
     } finally { 
      // 4: Closing connection 
      try { 
       in.close(); 
       out.close(); 
       providerSocket.close(); 
      } catch (IOException ioException) { 
       ioException.printStackTrace(); 
      } 
     } 
    } 

    void sendMessage(String msg) { 
     try { 
      out.writeObject(msg); 
      out.flush(); 
      System.out.println("server>" + msg); 
     } catch (IOException ioException) { 
      ioException.printStackTrace(); 
     } 
    } 

    public static void main(String args[]) { 
     Provider server = new Provider(); 
     while (true) { 
      server.run(); 
     } 
    } 
} 

Answer 1

您可以使用套接字像這樣：

String hostname = "1.2.3.4"; 
int port = 865; 

Socket socket = null; 

try { 
    socket = new Socket(InetAddress.getByName(hostname), port); 
} catch (Exception e) { 

    e.printStackTrace(); 
} 

ParcelFileDescriptor socketedFile = ParcelFileDescriptor.fromSocket(socket); 

然後設置socketedFile輸出文件（socketedFile.getFileDescriptor（））。這將以字節形式發送。

或者爲了使其更穩定，請將MediaRecorder中的數據寫出到本地緩衝區，然後讓單獨的線程檢查該緩衝區並將其寫入套接字，以允許套接字連接中的小斷開。

有關更多信息，請參見該問題：android stream audio to server

顯然，你這時就需要有一個服務器上運行的應用收到您的字節，並把它轉換成音頻數據。