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 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 = "UsbACEndpoint";
  
      protected final int 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, int subclass) {
          super(length, type);
          mSubclass = subclass;
      }
  
      public int 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();
          int 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;
          }
      }
  }
  