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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 package org.chromium.media.midi; | |
| 6 | |
| 7 import android.annotation.TargetApi; | |
| 8 import android.media.midi.MidiDevice; | |
| 9 import android.media.midi.MidiOutputPort; | |
| 10 import android.media.midi.MidiReceiver; | |
| 11 import android.os.Build; | |
| 12 | |
| 13 import org.chromium.base.annotations.CalledByNative; | |
| 14 import org.chromium.base.annotations.JNINamespace; | |
| 15 | |
| 16 import java.io.IOException; | |
| 17 | |
| 18 // Note "InputPort" is named in the Web MIDI manner. It corresponds to MidiOutpu
tPort class in the | |
| 19 // Android API. | |
| 20 /** | |
| 21 * A MidiInputPortAndroid provides data to the associated media::midi::MidiInput
PortAndroid object. | |
| 22 */ | |
| 23 @JNINamespace("media::midi") | |
| 24 @TargetApi(Build.VERSION_CODES.M) | |
| 25 class MidiInputPortAndroid { | |
| 26 /** | |
| 27 * The underlying port. | |
| 28 */ | |
| 29 private MidiOutputPort mPort; | |
| 30 /** | |
| 31 * A pointer to a media::midi::MidiInputPortAndroid object. | |
| 32 */ | |
| 33 private long mNativeReceiverPointer; | |
| 34 /** | |
| 35 * The device this port belongs to. | |
| 36 */ | |
| 37 private final MidiDevice mDevice; | |
| 38 /** | |
| 39 * The index of the port in the associated device. | |
| 40 */ | |
| 41 private final int mIndex; | |
| 42 | |
| 43 /** | |
| 44 * constructor | |
| 45 * @param device the device this port belongs to. | |
| 46 * @param index the index of the port in the associated device. | |
| 47 */ | |
| 48 MidiInputPortAndroid(MidiDevice device, int index) { | |
| 49 mDevice = device; | |
| 50 mIndex = index; | |
| 51 } | |
| 52 | |
| 53 /** | |
| 54 * Registers this object to the underlying port so as to the C++ function wi
ll be called with | |
| 55 * the given C++ object when data arrives. | |
| 56 * @param nativeReceiverPointer a pointer to a media::midi::MidiInputPortAnd
roid object. | |
| 57 * @return true if this operation succeeds or the port is already open. | |
| 58 */ | |
| 59 @CalledByNative | |
| 60 boolean open(long nativeReceiverPointer) { | |
| 61 if (mPort != null) { | |
| 62 return true; | |
| 63 } | |
| 64 mPort = mDevice.openOutputPort(mIndex); | |
| 65 if (mPort == null) { | |
| 66 return false; | |
| 67 } | |
| 68 mNativeReceiverPointer = nativeReceiverPointer; | |
| 69 mPort.connect(new MidiReceiver() { | |
| 70 @Override | |
| 71 public void onSend(byte[] bs, int offset, int count, long timestamp)
{ | |
| 72 nativeOnData(mNativeReceiverPointer, bs, offset, count, timestam
p); | |
| 73 } | |
| 74 }); | |
| 75 return true; | |
| 76 } | |
| 77 | |
| 78 /** | |
| 79 * Closes the port. | |
| 80 */ | |
| 81 @CalledByNative | |
| 82 void close() { | |
| 83 if (mPort == null) { | |
| 84 return; | |
| 85 } | |
| 86 try { | |
| 87 mPort.close(); | |
| 88 } catch (IOException e) { | |
| 89 // We can do nothing here. Just ignore the error. | |
| 90 } | |
| 91 mNativeReceiverPointer = 0; | |
| 92 mPort = null; | |
| 93 } | |
| 94 | |
| 95 private static native void nativeOnData( | |
| 96 long nativeMidiInputPortAndroid, byte[] bs, int offset, int count, l
ong timestamp); | |
| 97 } | |
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Chromium Code Reviews
Issue 2418493002:
//media/midi: use top level namespace midi rather than media.midi (Closed)
