content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.example.android.midiscope;
  
  import android.media.midi.MidiDeviceService;
  import android.media.midi.MidiDeviceStatus;
  import android.media.midi.MidiReceiver;
  
  import com.example.android.common.midi.MidiFramer;
  
  import java.io.IOException;
  
  /**
   * Virtual MIDI Device that logs messages to a ScopeLogger.
   */
  
  public class MidiScope extends MidiDeviceService {
  
      private static ScopeLogger mScopeLogger;
      private MidiReceiver mInputReceiver = new MyReceiver();
      private static MidiFramer mDeviceFramer;
  
      @Override
      public MidiReceiver[] onGetInputPortReceivers() {
          return new MidiReceiver[] { mInputReceiver };
      }
  
      public static void setScopeLogger(ScopeLogger logger) {
          if (logger != null) {
              // Receiver that prints the messages.
              LoggingReceiver loggingReceiver = new LoggingReceiver(logger);
              mDeviceFramer = new MidiFramer(loggingReceiver);
          }
          mScopeLogger = logger;
      }
  
      private static class MyReceiver extends MidiReceiver {
          @Override
          public void onSend(byte[] data, int offset, int count,
                  long timestamp) throws IOException {
              if (mScopeLogger != null) {
                  // Send raw data to be parsed into discrete messages.
                  mDeviceFramer.send(data, offset, count, timestamp);
              }
          }
      }
  
      /**
       * This will get called when clients connect or disconnect.
       * Log device information.
       */
      @Override
      public void onDeviceStatusChanged(MidiDeviceStatus status) {
          if (mScopeLogger != null) {
              if (status.isInputPortOpen(0)) {
                  mScopeLogger.log("=== connected ===");
                  String text = MidiPrinter.formatDeviceInfo(
                          status.getDeviceInfo());
                  mScopeLogger.log(text);
              } else {
                  mScopeLogger.log("--- disconnected ---");
              }
          }
      }
  }
  