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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.Locale;
     24 import java.util.concurrent.TimeUnit;
     25 
     26 /**
     27  * Convert incoming MIDI messages to a string and write them to a ScopeLogger.
     28  * Assume that messages have been aligned using a MidiFramer.
     29  */
     30 public class LoggingReceiver extends MidiReceiver {
     31     public static final String TAG = "MidiScope";
     32     private static final long NANOS_PER_SECOND = TimeUnit.SECONDS.toNanos(1);
     33     private long mStartTime;
     34     private ScopeLogger mLogger;
     35 
     36     public LoggingReceiver(ScopeLogger logger) {
     37         mStartTime = System.nanoTime();
     38         mLogger = logger;
     39     }
     40 
     41     /*
     42      * @see android.media.midi.MidiReceiver#onReceive(byte[], int, int, long)
     43      */
     44     @Override
     45     public void onSend(byte[] data, int offset, int count, long timestamp)
     46             throws IOException {
     47         StringBuilder sb = new StringBuilder();
     48         if (timestamp == 0) {
     49             sb.append("-----0----: ");
     50         } else {
     51             long monoTime = timestamp - mStartTime;
     52             double seconds = (double) monoTime / NANOS_PER_SECOND;
     53             sb.append(String.format(Locale.US, "%10.3f: ", seconds));
     54         }
     55         sb.append(MidiPrinter.formatBytes(data, offset, count));
     56         sb.append(": ");
     57         sb.append(MidiPrinter.formatMessage(data, offset));
     58         String text = sb.toString();
     59         mLogger.log(text);
     60         Log.i(TAG, text);
     61     }
     62 
     63 }