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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.midiscope;
     18 
     19 import android.media.midi.MidiReceiver;
     20 import android.util.Log;
     21 
     22 import java.io.IOException;
     23 import java.util.concurrent.TimeUnit;
     24 
     25 /**
     26  * Convert incoming MIDI messages to a string and write them to a ScopeLogger.
     27  * Assume that messages have been aligned using a MidiFramer.
     28  */
     29 public class LoggingReceiver extends MidiReceiver {
     30     public static final String TAG = "MidiScope";
     31     private static final long NANOS_PER_SECOND = TimeUnit.SECONDS.toNanos(1);
     32     private long mStartTime;
     33     private ScopeLogger mLogger;
     34 
     35     public LoggingReceiver(ScopeLogger logger) {
     36         mStartTime = System.nanoTime();
     37         mLogger = logger;
     38     }
     39 
     40     /*
     41      * @see android.media.midi.MidiReceiver#onReceive(byte[], int, int, long)
     42      */
     43     @Override
     44     public void onSend(byte[] data, int offset, int count, long timestamp)
     45             throws IOException {
     46         StringBuilder sb = new StringBuilder();
     47         if (timestamp == 0) {
     48             sb.append(String.format("-----0----: "));
     49         } else {
     50             long monoTime = timestamp - mStartTime;
     51             double seconds = (double) monoTime / NANOS_PER_SECOND;
     52             sb.append(String.format("%10.3f: ", seconds));
     53         }
     54         sb.append(MidiPrinter.formatBytes(data, offset, count));
     55         sb.append(": ");
     56         sb.append(MidiPrinter.formatMessage(data, offset, count));
     57         String text = sb.toString();
     58         mLogger.log(text);
     59         Log.i(TAG, text);
     60     }
     61 
     62 }