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      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 import com.android.server.usb.descriptors.report.ReportCanvas;
     19 
     20 /**
     21  * @hide
     22  * An audio class-specific Format III interface.
     23  * see Frmts20.pdf section 2.3.1.6 2.3.3.1 Type III Format Type Descriptor
     24  */
     25 public final class Usb20ASFormatIII extends UsbASFormat {
     26     private static final String TAG = "Usb20ASFormatIII";
     27 
     28     // frmts20.pdf Table 2-4: Type III Format Type Descriptor
     29     private byte mSubslotSize;      // 4:1 The number of bytes occupied by one
     30                                     // audio subslot. Must be set to two.
     31     private byte mBitResolution;    // 5:1 The number of effectively used bits from
     32                                     // the available bits in an audio subframe.
     33 
     34     public Usb20ASFormatIII(int length, byte type, byte subtype, byte formatType, int subclass) {
     35         super(length, type, subtype, formatType, subclass);
     36     }
     37 
     38     public byte getSubslotSize() {
     39         return mSubslotSize;
     40     }
     41 
     42     public byte getBitResolution() {
     43         return mBitResolution;
     44     }
     45 
     46     @Override
     47     public int parseRawDescriptors(ByteStream stream) {
     48         mSubslotSize = stream.getByte();
     49         mBitResolution = stream.getByte();
     50 
     51         return mLength;
     52     }
     53 
     54     @Override
     55     public void report(ReportCanvas canvas) {
     56         super.report(canvas);
     57 
     58         canvas.openList();
     59         canvas.writeListItem("Subslot Size: " + getSubslotSize());
     60         canvas.writeListItem("Bit Resolution: " + getBitResolution());
     61         canvas.closeList();
     62     }
     63 }
     64