content: /*
   * 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, int 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();
      }
  }
  