| /* |
| * 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; |
| |
| /** |
| * @hide |
| * An audio class-specific Interface Header. |
| * see audio10.pdf section 4.3.2 |
| */ |
| public class UsbACHeader extends UsbACInterface { |
| private static final String TAG = "ACHeader"; |
| |
| private int mADCRelease; // 3:2 Audio Device Class Specification Release (BCD). |
| private int mTotalLength; // 5:2 Total number of bytes returned for the class-specific |
| // AudioControl interface descriptor. Includes the combined length |
| // of this descriptor header and all Unit and Terminal descriptors. |
| private byte mNumInterfaces = 0; // 7:1 The number of AudioStreaming and MIDIStreaming |
| // interfaces in the Audio Interface Collection to which this |
| // AudioControl interface belongs: n |
| private byte[] mInterfaceNums = null; // 8:n List of Audio/MIDI streaming interface |
| // numbers associate with this endpoint |
| private byte mControls; // Vers 2.0 thing |
| |
| public UsbACHeader(int length, byte type, byte subtype, byte subclass) { |
| super(length, type, subtype, subclass); |
| } |
| |
| public int getADCRelease() { |
| return mADCRelease; |
| } |
| |
| public int getTotalLength() { |
| return mTotalLength; |
| } |
| |
| public byte getNumInterfaces() { |
| return mNumInterfaces; |
| } |
| |
| public byte[] getInterfaceNums() { |
| return mInterfaceNums; |
| } |
| |
| public byte getControls() { |
| return mControls; |
| } |
| |
| @Override |
| public int parseRawDescriptors(ByteStream stream) { |
| mADCRelease = stream.unpackUsbWord(); |
| |
| mTotalLength = stream.unpackUsbWord(); |
| if (mADCRelease >= 0x200) { |
| mControls = stream.getByte(); |
| } else { |
| mNumInterfaces = stream.getByte(); |
| mInterfaceNums = new byte[mNumInterfaces]; |
| for (int index = 0; index < mNumInterfaces; index++) { |
| mInterfaceNums[index] = stream.getByte(); |
| } |
| } |
| |
| return mLength; |
| } |
| } |