[Web MIDI] Use Android MIDI API.

media/midi/java/src/org/chromium/media/midi/MidiOutputPortAndroid.java

Index: media/midi/java/src/org/chromium/media/midi/MidiOutputPortAndroid.java
diff --git a/media/midi/java/src/org/chromium/media/midi/MidiOutputPortAndroid.java b/media/midi/java/src/org/chromium/media/midi/MidiOutputPortAndroid.java
new file mode 100644
index 0000000000000000000000000000000000000000..4763ba09f71fa62b3c2108a4c9fafdd2ea157e08
--- /dev/null
+++ b/media/midi/java/src/org/chromium/media/midi/MidiOutputPortAndroid.java
@@ -0,0 +1,88 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.media.midi;
+
+import android.media.midi.MidiDevice;
+import android.media.midi.MidiInputPort;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+import java.io.IOException;
+
+/**
+ * A class implementing media::midi::MidiOutputPortAndroid functionality.
+ */
+// Note "OutputPort" is named in the WebMIDI manner. It corresponds to MidiInputPort class in the

[Takashi Toyoshima, 2015/09/07 16:42:20]

s/WebMIDI/Web MIDI/

[yhirano, 2015/09/10 11:43:50]

Done.

+// Android API.
+@JNINamespace("media::midi")
+class MidiOutputPortAndroid {
+    /**
+     * The underlying port.
+     */
+    private MidiInputPort mPort;
+    /**
+     * The device this port belongs to.
+     */
+    private MidiDevice mDevice;
+    /**
+     * The index of the port in the associated device.
+     */
+    private int mIndex;
+
+    /**
+     * constructor
+     * @param device The device this port belongs to.
+     * @param index The index of the port in the associated device.
+     */
+    MidiOutputPortAndroid(MidiDevice device, int index) {
+        mDevice = device;
+        mIndex = index;
+    }
+
+    /**
+     * Opens this port.
+     * @return true when the operation succeeds or the port is already open.
+     */
+    @CalledByNative
+    boolean open() {
+        if (mPort != null) {
+            return true;
+        }
+        mPort = mDevice.openInputPort(mIndex);
+        return mPort != null;
+    }
+
+    /**
+     * Sends the data to the underlying output port.
+     */
+    @CalledByNative
+    void send(byte[] bs) {
+        if (mPort == null) {
+            return;
+        }
+        try {
+            mPort.send(bs, 0, bs.length);
+        } catch (IOException e) {
+            // We can do nothing here. Just ignore the error.

[Takashi Toyoshima, 2015/09/07 16:42:19]

It's nice to log the error.

[yhirano, 2015/09/10 11:43:50]

Done.

+        }
+    }
+
+    /**
+     * Closes the port.
+     */
+    @CalledByNative
+    void close() {
+        if (mPort == null) {
+            return;
+        }
+        try {
+            mPort.close();
+        } catch (IOException e) {
+            // We can do nothing here. Just ignore the error.
+        }
+        mPort = null;
+    }
+}