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MidiScope / src / com.example.android.midiscope /

MidiScope.java

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