| /* |
| * Copyright (C) 2017 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 com.android.server.usb.descriptors; |
| |
| import android.util.Log; |
| |
| /** |
| * @hide |
| * An audio class-specific Endpoint |
| * see audio10.pdf section 4.4.1.2 |
| */ |
| abstract class UsbACEndpoint extends UsbDescriptor { |
| private static final String TAG = "ACEndpoint"; |
| |
| protected final byte mSubclass; // from the mSubclass member of the "enclosing" |
| // Interface Descriptor, not the stream. |
| protected byte mSubtype; // 2:1 HEADER descriptor subtype |
| |
| UsbACEndpoint(int length, byte type, byte subclass) { |
| super(length, type); |
| mSubclass = subclass; |
| } |
| |
| public byte getSubclass() { |
| return mSubclass; |
| } |
| |
| public byte getSubtype() { |
| return mSubtype; |
| } |
| |
| @Override |
| public int parseRawDescriptors(ByteStream stream) { |
| mSubtype = stream.getByte(); |
| |
| return mLength; |
| } |
| |
| public static UsbDescriptor allocDescriptor(UsbDescriptorParser parser, |
| int length, byte type) { |
| UsbInterfaceDescriptor interfaceDesc = parser.getCurInterface(); |
| byte subClass = interfaceDesc.getUsbSubclass(); |
| switch (subClass) { |
| case AUDIO_AUDIOCONTROL: |
| return new UsbACAudioControlEndpoint(length, type, subClass); |
| |
| case AUDIO_AUDIOSTREAMING: |
| return new UsbACAudioStreamEndpoint(length, type, subClass); |
| |
| case AUDIO_MIDISTREAMING: |
| return new UsbACMidiEndpoint(length, type, subClass); |
| |
| default: |
| Log.w(TAG, "Unknown Audio Class Endpoint id:0x" + Integer.toHexString(subClass)); |
| return null; |
| } |
| } |
| } |