| /* |
| * 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 com.android.server.usb.descriptors.report.ReportCanvas; |
| |
| /** |
| * @hide |
| * An audio class-specific Header descriptor. |
| * see Audio20.pdf section 4.7.2 Class-Specific AC Interface Descriptor |
| */ |
| public final class Usb20ACHeader extends UsbACHeaderInterface { |
| private static final String TAG = "Usb20ACHeader"; |
| |
| private byte mCategory; // 5:1 Constant, indicating the primary use of this audio function. |
| // See audio20.pdf Appendix A.7, “Audio Function Category Codes.” |
| private byte mControls; // 8:1 See audio20.pdf Table 4-5. |
| |
| public Usb20ACHeader(int length, byte type, byte subtype, byte subclass, int spec) { |
| super(length, type, subtype, subclass, spec); |
| } |
| |
| public byte getCategory() { |
| return mCategory; |
| } |
| |
| public byte getControls() { |
| return mControls; |
| } |
| |
| @Override |
| public int parseRawDescriptors(ByteStream stream) { |
| mCategory = stream.getByte(); |
| mTotalLength = stream.unpackUsbShort(); |
| mControls = stream.getByte(); |
| |
| return mLength; |
| } |
| |
| @Override |
| public void report(ReportCanvas canvas) { |
| super.report(canvas); |
| |
| canvas.openList(); |
| canvas.writeListItem("Category: " + ReportCanvas.getHexString(getCategory())); |
| canvas.writeListItem("Controls: " + ReportCanvas.getHexString(getControls())); |
| canvas.closeList(); |
| } |
| } |