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/*
* Copyright (C) 2014 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 android.media.midi;
import android.content.Context;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.IBinder;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.util.Log;
import dalvik.system.CloseGuard;
import libcore.io.IoUtils;
import java.io.Closeable;
import java.io.IOException;
/**
* This class is used for sending and receiving data to and from a MIDI device
* Instances of this class are created by {@link MidiManager#openDevice}.
*/
public final class MidiDevice implements Closeable {
private static final String TAG = "MidiDevice";
private final MidiDeviceInfo mDeviceInfo;
private final IMidiDeviceServer mDeviceServer;
private Context mContext;
private ServiceConnection mServiceConnection;
private final CloseGuard mGuard = CloseGuard.get();
/**
* This class represents a connection between the output port of one device
* and the input port of another. Created by {@link #connectPorts}.
* Close this object to terminate the connection.
*/
public class MidiConnection implements Closeable {
private final IBinder mToken;
private final MidiInputPort mInputPort;
MidiConnection(IBinder token, MidiInputPort inputPort) {
mToken = token;
mInputPort = inputPort;
}
@Override
public void close() throws IOException {
try {
mDeviceServer.closePort(mToken);
IoUtils.closeQuietly(mInputPort);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in MidiConnection.close");
}
}
}
/* package */ MidiDevice(MidiDeviceInfo deviceInfo, IMidiDeviceServer server) {
this(deviceInfo, server, null, null);
}
/* package */ MidiDevice(MidiDeviceInfo deviceInfo, IMidiDeviceServer server,
Context context, ServiceConnection serviceConnection) {
mDeviceInfo = deviceInfo;
mDeviceServer = server;
mContext = context;
mServiceConnection = serviceConnection;
mGuard.open("close");
}
/**
* Returns a {@link MidiDeviceInfo} object, which describes this device.
*
* @return the {@link MidiDeviceInfo} object
*/
public MidiDeviceInfo getInfo() {
return mDeviceInfo;
}
/**
* Called to open a {@link MidiInputPort} for the specified port number.
*
* @param portNumber the number of the input port to open
* @return the {@link MidiInputPort}
*/
public MidiInputPort openInputPort(int portNumber) {
try {
IBinder token = new Binder();
ParcelFileDescriptor pfd = mDeviceServer.openInputPort(token, portNumber);
if (pfd == null) {
return null;
}
return new MidiInputPort(mDeviceServer, token, pfd, portNumber);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in openInputPort");
return null;
}
}
/**
* Called to open a {@link MidiOutputPort} for the specified port number.
*
* @param portNumber the number of the output port to open
* @return the {@link MidiOutputPort}
*/
public MidiOutputPort openOutputPort(int portNumber) {
try {
IBinder token = new Binder();
ParcelFileDescriptor pfd = mDeviceServer.openOutputPort(token, portNumber);
if (pfd == null) {
return null;
}
return new MidiOutputPort(mDeviceServer, token, pfd, portNumber);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in openOutputPort");
return null;
}
}
/**
* Connects the supplied {@link MidiInputPort} to the output port of this device
* with the specified port number. Once the connection is made, the MidiInput port instance
* can no longer receive data via its {@link MidiReceiver#onSend} method.
* This method returns a {@link MidiDevice.MidiConnection} object, which can be used
* to close the connection.
*
* @param inputPort the inputPort to connect
* @param outputPortNumber the port number of the output port to connect inputPort to.
* @return {@link MidiDevice.MidiConnection} object if the connection is successful,
* or null in case of failure.
*/
public MidiConnection connectPorts(MidiInputPort inputPort, int outputPortNumber) {
if (outputPortNumber < 0 || outputPortNumber >= mDeviceInfo.getOutputPortCount()) {
throw new IllegalArgumentException("outputPortNumber out of range");
}
ParcelFileDescriptor pfd = inputPort.claimFileDescriptor();
if (pfd == null) {
return null;
}
try {
IBinder token = new Binder();
mDeviceServer.connectPorts(token, pfd, outputPortNumber);
// close our copy of the file descriptor
IoUtils.closeQuietly(pfd);
return new MidiConnection(token, inputPort);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in connectPorts");
return null;
}
}
@Override
public void close() throws IOException {
synchronized (mGuard) {
mGuard.close();
if (mContext != null && mServiceConnection != null) {
mContext.unbindService(mServiceConnection);
mContext = null;
mServiceConnection = null;
}
}
}
@Override
protected void finalize() throws Throwable {
try {
mGuard.warnIfOpen();
close();
} finally {
super.finalize();
}
}
@Override
public String toString() {
return ("MidiDevice: " + mDeviceInfo.toString());
}
}
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