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.MidiReceiver;
  import android.util.Log;
  
  import java.io.IOException;
  import java.util.Locale;
  import java.util.concurrent.TimeUnit;
  
  /**
   * Convert incoming MIDI messages to a string and write them to a ScopeLogger.
   * Assume that messages have been aligned using a MidiFramer.
   */
  public class LoggingReceiver extends MidiReceiver {
      public static final String TAG = "MidiScope";
      private static final long NANOS_PER_SECOND = TimeUnit.SECONDS.toNanos(1);
      private long mStartTime;
      private ScopeLogger mLogger;
  
      public LoggingReceiver(ScopeLogger logger) {
          mStartTime = System.nanoTime();
          mLogger = logger;
      }
  
      /*
       * @see android.media.midi.MidiReceiver#onReceive(byte[], int, int, long)
       */
      @Override
      public void onSend(byte[] data, int offset, int count, long timestamp)
              throws IOException {
          StringBuilder sb = new StringBuilder();
          if (timestamp == 0) {
              sb.append("-----0----: ");
          } else {
              long monoTime = timestamp - mStartTime;
              double seconds = (double) monoTime / NANOS_PER_SECOND;
              sb.append(String.format(Locale.US, "%10.3f: ", seconds));
          }
          sb.append(MidiPrinter.formatBytes(data, offset, count));
          sb.append(": ");
          sb.append(MidiPrinter.formatMessage(data, offset));
          String text = sb.toString();
          mLogger.log(text);
          Log.i(TAG, text);
      }
  
  }