1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.server.usb.descriptors; 17 18 /** 19 * @hide 20 * An audio class-specific Audio Control Endpoint. 21 * audio10.pdf section 4.4.2.1 22 */ 23 public class UsbACAudioControlEndpoint extends UsbACEndpoint { 24 private static final String TAG = "UsbACAudioControlEndpoint"; 25 26 private byte mAddress; // 2:1 The address of the endpoint on the USB device. 27 // D7: Direction. 1 = IN endpoint 28 // D6..4: Reserved, reset to zero 29 // D3..0: The endpoint number. 30 private byte mAttribs; // 3:1 (see ATTRIBSMASK_* below 31 private int mMaxPacketSize; // 4:2 Maximum packet size this endpoint is capable of sending 32 // or receiving when this configuration is selected. 33 private byte mInterval; // 6:1 34 35 static final byte ADDRESSMASK_DIRECTION = (byte) 0x80; 36 static final byte ADDRESSMASK_ENDPOINT = 0x0F; 37 38 static final byte ATTRIBSMASK_SYNC = 0x0C; 39 static final byte ATTRIBMASK_TRANS = 0x03; 40 41 public UsbACAudioControlEndpoint(int length, byte type, int subclass) { 42 super(length, type, subclass); 43 } 44 45 public byte getAddress() { 46 return mAddress; 47 } 48 49 public byte getAttribs() { 50 return mAttribs; 51 } 52 53 public int getMaxPacketSize() { 54 return mMaxPacketSize; 55 } 56 57 public byte getInterval() { 58 return mInterval; 59 } 60 61 @Override 62 public int parseRawDescriptors(ByteStream stream) { 63 super.parseRawDescriptors(stream); 64 65 mAddress = stream.getByte(); 66 mAttribs = stream.getByte(); 67 mMaxPacketSize = stream.unpackUsbShort(); 68 mInterval = stream.getByte(); 69 70 return mLength; 71 } 72 } 73