185 lines
5.8 KiB
Java
185 lines
5.8 KiB
Java
/*
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* Copyright (C) 2014 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 android.media.midi;
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import android.os.IBinder;
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import android.os.RemoteException;
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import android.util.Log;
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import dalvik.system.CloseGuard;
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import libcore.io.IoUtils;
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import java.io.Closeable;
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import java.io.FileDescriptor;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* This class is used for sending data to a port on a MIDI device
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*/
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public final class MidiInputPort extends MidiReceiver implements Closeable {
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private static final String TAG = "MidiInputPort";
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private IMidiDeviceServer mDeviceServer;
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private final IBinder mToken;
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private final int mPortNumber;
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private FileDescriptor mFileDescriptor;
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private FileOutputStream mOutputStream;
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private final CloseGuard mGuard = CloseGuard.get();
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private boolean mIsClosed;
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private AtomicInteger mTotalBytes = new AtomicInteger();
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// buffer to use for sending data out our output stream
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private final byte[] mBuffer = new byte[MidiPortImpl.MAX_PACKET_SIZE];
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/* package */ MidiInputPort(IMidiDeviceServer server, IBinder token,
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FileDescriptor fd, int portNumber) {
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super(MidiPortImpl.MAX_PACKET_DATA_SIZE);
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mDeviceServer = server;
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mToken = token;
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mFileDescriptor = fd;
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mPortNumber = portNumber;
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mOutputStream = new FileOutputStream(fd);
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mGuard.open("close");
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}
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/* package */ MidiInputPort(FileDescriptor fd, int portNumber) {
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this(null, null, fd, portNumber);
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}
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/**
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* Returns the port number of this port
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*
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* @return the port's port number
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*/
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public final int getPortNumber() {
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return mPortNumber;
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}
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@Override
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public void onSend(byte[] msg, int offset, int count, long timestamp) throws IOException {
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if (offset < 0 || count < 0 || offset + count > msg.length) {
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throw new IllegalArgumentException("offset or count out of range");
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}
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if (count > MidiPortImpl.MAX_PACKET_DATA_SIZE) {
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throw new IllegalArgumentException("count exceeds max message size");
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}
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synchronized (mBuffer) {
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if (mOutputStream == null) {
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throw new IOException("MidiInputPort is closed");
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}
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int length = MidiPortImpl.packData(msg, offset, count, timestamp, mBuffer);
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mOutputStream.write(mBuffer, 0, length);
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mTotalBytes.addAndGet(length);
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}
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}
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@Override
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public void onFlush() throws IOException {
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synchronized (mBuffer) {
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if (mOutputStream == null) {
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throw new IOException("MidiInputPort is closed");
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}
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int length = MidiPortImpl.packFlush(mBuffer);
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mOutputStream.write(mBuffer, 0, length);
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}
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}
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// used by MidiDevice.connectInputPort() to connect our socket directly to another device
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/* package */ FileDescriptor claimFileDescriptor() {
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synchronized (mGuard) {
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FileDescriptor fd;
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synchronized (mBuffer) {
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fd = mFileDescriptor;
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if (fd == null) return null;
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IoUtils.closeQuietly(mOutputStream);
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mFileDescriptor = null;
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mOutputStream = null;
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}
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// Set mIsClosed = true so we will not call mDeviceServer.closePort() in close().
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// MidiDevice.MidiConnection.close() will do the cleanup instead.
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mIsClosed = true;
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return fd;
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}
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}
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// used by MidiDevice.MidiConnection to close this port after the connection is closed
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/* package */ IBinder getToken() {
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return mToken;
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}
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// used by MidiDevice.MidiConnection to close this port after the connection is closed
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/* package */ IMidiDeviceServer getDeviceServer() {
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return mDeviceServer;
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}
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@Override
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public void close() throws IOException {
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synchronized (mGuard) {
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if (mIsClosed) return;
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mGuard.close();
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synchronized (mBuffer) {
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if (mFileDescriptor != null) {
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IoUtils.closeQuietly(mFileDescriptor);
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mFileDescriptor = null;
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}
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if (mOutputStream != null) {
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mOutputStream.close();
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mOutputStream = null;
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}
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}
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if (mDeviceServer != null) {
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try {
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mDeviceServer.closePort(mToken);
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} catch (RemoteException e) {
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Log.e(TAG, "RemoteException in MidiInputPort.close()");
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}
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}
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mIsClosed = true;
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}
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}
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@Override
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protected void finalize() throws Throwable {
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try {
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if (mGuard != null) {
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mGuard.warnIfOpen();
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}
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// not safe to make binder calls from finalize()
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mDeviceServer = null;
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close();
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} finally {
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super.finalize();
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}
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}
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/**
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* Pulls total number of bytes and sets to zero. This allows multiple callers.
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* @hide
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*/
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public int pullTotalBytesCount() {
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return mTotalBytes.getAndSet(0);
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}
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}
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