Reland: Web MIDI: split build rules for media/midi

media/base/android/java/src/org/chromium/media/UsbMidiDeviceAndroid.java

Index: media/base/android/java/src/org/chromium/media/UsbMidiDeviceAndroid.java
diff --git a/media/base/android/java/src/org/chromium/media/UsbMidiDeviceAndroid.java b/media/base/android/java/src/org/chromium/media/UsbMidiDeviceAndroid.java
deleted file mode 100644
index c581131fb39a646638985472e7d69ad7b8dc9c57..0000000000000000000000000000000000000000
--- a/media/base/android/java/src/org/chromium/media/UsbMidiDeviceAndroid.java
+++ /dev/null
@@ -1,327 +0,0 @@
-// Copyright 2014 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;
-
-import android.annotation.TargetApi;
-import android.hardware.usb.UsbConstants;
-import android.hardware.usb.UsbDevice;
-import android.hardware.usb.UsbDeviceConnection;
-import android.hardware.usb.UsbEndpoint;
-import android.hardware.usb.UsbInterface;
-import android.hardware.usb.UsbManager;
-import android.hardware.usb.UsbRequest;
-import android.os.Build;
-import android.os.Handler;
-import android.util.SparseArray;
-
-import org.chromium.base.CalledByNative;
-import org.chromium.base.JNINamespace;
-
-import java.nio.ByteBuffer;
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * Owned by its native counterpart declared in usb_midi_device_android.h.
- * Refer to that class for general comments.
- */
-@JNINamespace("media")
-class UsbMidiDeviceAndroid {
-    /**
-     * A connection handle for this device.
-     */
-    private final UsbDeviceConnection mConnection;
-
-    /**
-     * A map from endpoint number to UsbEndpoint.
-     */
-    private final SparseArray<UsbEndpoint> mEndpointMap;
-
-    /**
-     * A map from UsbEndpoint to UsbRequest associated to it.
-     */
-    private final Map<UsbEndpoint, UsbRequest> mRequestMap;
-
-    /**
-     * The handler used for posting events on the main thread.
-     */
-    private final Handler mHandler;
-
-    /**
-     * True if this device is closed.
-     */
-    private boolean mIsClosed;
-
-    /**
-     * True if there is a thread processing input data.
-     */
-    private boolean mHasInputThread;
-
-    /**
-     * The identifier of this device.
-     */
-    private long mNativePointer;
-
-    /**
-     * The underlying USB device.
-     */
-    private UsbDevice mUsbDevice;
-
-    /**
-     * Audio interface subclass code for MIDI.
-     */
-    static final int MIDI_SUBCLASS = 3;
-
-    /**
-     * The request type to request a USB descriptor.
-     */
-    static final int REQUEST_GET_DESCRIPTOR = 0x06;
-
-    /**
-     * The STRING descriptor type.
-     */
-    static final int STRING_DESCRIPTOR_TYPE = 0x03;
-
-    /**
-     * Constructs a UsbMidiDeviceAndroid.
-     * @param manager
-     * @param device The USB device which this object is assocated with.
-     */
-    UsbMidiDeviceAndroid(UsbManager manager, UsbDevice device) {
-        mConnection = manager.openDevice(device);
-        mEndpointMap = new SparseArray<UsbEndpoint>();
-        mRequestMap = new HashMap<UsbEndpoint, UsbRequest>();
-        mHandler = new Handler();
-        mUsbDevice = device;
-        mIsClosed = false;
-        mHasInputThread = false;
-        mNativePointer = 0;
-
-        for (int i = 0; i < device.getInterfaceCount(); ++i) {
-            UsbInterface iface = device.getInterface(i);
-            if (iface.getInterfaceClass() != UsbConstants.USB_CLASS_AUDIO
-                    || iface.getInterfaceSubclass() != MIDI_SUBCLASS) {
-                continue;
-            }
-            mConnection.claimInterface(iface, true);
-            for (int j = 0; j < iface.getEndpointCount(); ++j) {
-                UsbEndpoint endpoint = iface.getEndpoint(j);
-                if (endpoint.getDirection() == UsbConstants.USB_DIR_OUT) {
-                    mEndpointMap.put(endpoint.getEndpointNumber(), endpoint);
-                }
-            }
-        }
-        // Start listening for input endpoints.
-        // This function will create and run a thread if there is USB-MIDI endpoints in the
-        // device. Note that because UsbMidiDevice is shared among all tabs and the thread
-        // will be terminated when the device is disconnected, at most one thread can be created
-        // for each connected USB-MIDI device.
-        startListen(device);
-    }
-
-    /**
-     * Starts listening for input endpoints.
-     */
-    private void startListen(final UsbDevice device) {
-        final Map<UsbEndpoint, ByteBuffer> bufferForEndpoints =
-                new HashMap<UsbEndpoint, ByteBuffer>();
-
-        for (int i = 0; i < device.getInterfaceCount(); ++i) {
-            UsbInterface iface = device.getInterface(i);
-            if (iface.getInterfaceClass() != UsbConstants.USB_CLASS_AUDIO
-                    || iface.getInterfaceSubclass() != MIDI_SUBCLASS) {
-                continue;
-            }
-            for (int j = 0; j < iface.getEndpointCount(); ++j) {
-                UsbEndpoint endpoint = iface.getEndpoint(j);
-                if (endpoint.getDirection() == UsbConstants.USB_DIR_IN) {
-                    ByteBuffer buffer = ByteBuffer.allocate(endpoint.getMaxPacketSize());
-                    UsbRequest request = new UsbRequest();
-                    request.initialize(mConnection, endpoint);
-                    request.queue(buffer, buffer.remaining());
-                    bufferForEndpoints.put(endpoint, buffer);
-                }
-            }
-        }
-        if (bufferForEndpoints.isEmpty()) {
-            return;
-        }
-        mHasInputThread = true;
-        // bufferForEndpoints must not be accessed hereafter on this thread.
-        new Thread() {
-            @Override
-            public void run() {
-                while (true) {
-                    UsbRequest request = mConnection.requestWait();
-                    if (request == null) {
-                        // When the device is closed requestWait will fail.
-                        break;
-                    }
-                    UsbEndpoint endpoint = request.getEndpoint();
-                    if (endpoint.getDirection() != UsbConstants.USB_DIR_IN) {
-                        continue;
-                    }
-                    ByteBuffer buffer = bufferForEndpoints.get(endpoint);
-                    int length = getInputDataLength(buffer);
-                    if (length > 0) {
-                        buffer.rewind();
-                        final byte[] bs = new byte[length];
-                        buffer.get(bs, 0, length);
-                        postOnDataEvent(endpoint.getEndpointNumber(), bs);
-                    }
-                    buffer.rewind();
-                    request.queue(buffer, buffer.capacity());
-                }
-            }
-        }.start();
-    }
-
-    /**
-     * Posts a data input event to the main thread.
-     */
-    private void postOnDataEvent(final int endpointNumber, final byte[] bs) {
-        mHandler.post(new Runnable() {
-                @Override
-                public void run() {
-                    if (mIsClosed) {
-                        return;
-                    }
-                    nativeOnData(mNativePointer, endpointNumber, bs);
-                }
-            });
-    }
-
-    UsbDevice getUsbDevice() {
-        return mUsbDevice;
-    }
-
-    boolean isClosed() {
-        return mIsClosed;
-    }
-
-    /**
-     * Register the own native pointer.
-     */
-    @CalledByNative
-    void registerSelf(long nativePointer) {
-        mNativePointer = nativePointer;
-    }
-
-    /**
-     * Sends a USB-MIDI data to the device.
-     * @param endpointNumber The endpoint number of the destination endpoint.
-     * @param bs The data to be sent.
-     */
-    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
-    @CalledByNative
-    void send(int endpointNumber, byte[] bs) {
-        if (mIsClosed) {
-            return;
-        }
-        UsbEndpoint endpoint = mEndpointMap.get(endpointNumber);
-        if (endpoint == null) {
-            return;
-        }
-        if (shouldUseBulkTransfer()) {
-            // We use bulkTransfer instead of UsbRequest.queue because queueing
-            // a UsbRequest is currently not thread safe.
-            // Note that this is not exactly correct because we don't care
-            // about the transfer attribute (bmAttribute) of the endpoint.
-            // See also:
-            //  http://stackoverflow.com/questions/9644415/
-            //  https://code.google.com/p/android/issues/detail?id=59467
-            //
-            // TODO(yhirano): Delete this block once the problem is fixed.
-            final int timeout = 100;
-            mConnection.bulkTransfer(endpoint, bs, bs.length, timeout);
-        } else {
-            UsbRequest request = mRequestMap.get(endpoint);
-            if (request == null) {
-                request = new UsbRequest();
-                request.initialize(mConnection, endpoint);
-                mRequestMap.put(endpoint, request);
-            }
-            request.queue(ByteBuffer.wrap(bs), bs.length);
-        }
-    }
-
-    /**
-     * Returns true if |bulkTransfer| should be used in |send|.
-     * See comments in |send|.
-     */
-    private boolean shouldUseBulkTransfer() {
-        return mHasInputThread;
-    }
-
-    /**
-     * Returns the descriptors bytes of this device.
-     * @return The descriptors bytes of this device.
-     */
-    @CalledByNative
-    byte[] getDescriptors() {
-        if (mConnection == null) {
-            return new byte[0];
-        }
-        return mConnection.getRawDescriptors();
-    }
-
-    /**
-     * Returns the string descriptor bytes for the given index
-     * @param index index of the descriptor
-     * @return the string descriptor bytes for the given index.
-     */
-    @CalledByNative
-    byte[] getStringDescriptor(int index) {
-        if (mConnection == null) {
-            return new byte[0];
-        }
-        byte[] buffer = new byte[255];
-        int type = UsbConstants.USB_DIR_IN | UsbConstants.USB_TYPE_STANDARD;
-        int request = REQUEST_GET_DESCRIPTOR;
-        int value = (STRING_DESCRIPTOR_TYPE << 8) | index;
-        int read = mConnection.controlTransfer(type, request, value, 0, buffer, buffer.length, 0);
-        if (read < 0) {
-            return new byte[0];
-        }
-        return Arrays.copyOf(buffer, read);
-    }
-
-    /**
-     * Closes the device connection.
-     */
-    @CalledByNative
-    void close() {
-        mEndpointMap.clear();
-        for (UsbRequest request : mRequestMap.values()) {
-            request.close();
-        }
-        mRequestMap.clear();
-        mConnection.close();
-        mNativePointer = 0;
-        mIsClosed = true;
-    }
-
-    /**
-     * Returns the length of a USB-MIDI input.
-     * Since the Android API doesn't provide us the length,
-     * we calculate it manually.
-     */
-    private static int getInputDataLength(ByteBuffer buffer) {
-        int position = buffer.position();
-        // We assume that the data length is always divisable by 4.
-        for (int i = 0; i < position; i += 4) {
-            // Since Code Index Number 0 is reserved, it is not a valid USB-MIDI data.
-            if (buffer.get(i) == 0) {
-                return i;
-            }
-        }
-        return position;
-    }
-
-    private static native void nativeOnData(long nativeUsbMidiDeviceAndroid,
-                                            int endpointNumber,
-                                            byte[] data);
-}