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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 II interface.
     23  * see Frmts20.pdf section 2.4.2.1 Extended Type II Format Type Descriptor
     24  */
     25 public final class Usb20ASFormatIIEx extends UsbASFormat {
     26     private static final String TAG = "Usb20ASFormatIIEx";
     27 
     28     // Frmts20.pdf Table 2-7: Extended Type II Format Type Descriptor
     29     private int mMaxBitRate;    // 4:2 Indicates the maximum number of bits per
     30                                 // second this interface can handle in kbits/s
     31     private int mSamplesPerFrame;   // 6:2 Indicates the number of PCM audio
     32                                     // samples contained in one encoded audio frame.
     33     private byte mHeaderLength;     // 8:1 Size of the Packet Header, in bytes.
     34     private byte mSidebandProtocol; // 9:1 Constant, identifying the Side Band
     35                                     // Protocol used for the Packet Header content.
     36 
     37     public Usb20ASFormatIIEx(int length, byte type, byte subtype, byte formatType, byte subclass) {
     38         super(length, type, subtype, formatType, subclass);
     39     }
     40 
     41     public int getMaxBitRate() {
     42         return mMaxBitRate;
     43     }
     44 
     45     public int getSamplesPerFrame() {
     46         return mSamplesPerFrame;
     47     }
     48 
     49     public byte getHeaderLength() {
     50         return mHeaderLength;
     51     }
     52 
     53     public byte getSidebandProtocol() {
     54         return mSidebandProtocol;
     55     }
     56 
     57     @Override
     58     public int parseRawDescriptors(ByteStream stream) {
     59         mMaxBitRate = stream.unpackUsbShort();
     60         mSamplesPerFrame = stream.unpackUsbShort();
     61         mHeaderLength = stream.getByte();
     62         mSidebandProtocol = stream.getByte();
     63 
     64         return mLength;
     65     }
     66 
     67     @Override
     68     public void report(ReportCanvas canvas) {
     69         super.report(canvas);
     70 
     71         canvas.openList();
     72         canvas.writeListItem("Max Bit Rate: " + getMaxBitRate());
     73         canvas.writeListItem("Samples Per Frame: " + getSamplesPerFrame());
     74         canvas.writeListItem("Header Length: " + getHeaderLength());
     75         canvas.writeListItem("Sideband Protocol: " + getSidebandProtocol());
     76         canvas.closeList();
     77     }
     78 }
     79