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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 Mixer Interface.
     23  * see audio10.pdf section 4.3.2.3
     24  */
     25 public final class Usb10ACMixerUnit extends UsbACMixerUnit {
     26     private static final String TAG = "Usb10ACMixerUnit";
     27 
     28     private int mChannelConfig; // Spatial location of output channels
     29     private byte mChanNameID;   // First channel name string descriptor ID
     30     private byte[] mControls;   // bitmasks of which controls are present for each channel
     31     private byte mNameID;       // string descriptor ID of mixer name
     32 
     33     public Usb10ACMixerUnit(int length, byte type, byte subtype, int subClass) {
     34         super(length, type, subtype, subClass);
     35     }
     36 
     37     public int getChannelConfig() {
     38         return mChannelConfig;
     39     }
     40 
     41     public byte getChanNameID() {
     42         return mChanNameID;
     43     }
     44 
     45     public byte[] getControls() {
     46         return mControls;
     47     }
     48 
     49     public byte getNameID() {
     50         return mNameID;
     51     }
     52 
     53     @Override
     54     public int parseRawDescriptors(ByteStream stream) {
     55         super.parseRawDescriptors(stream);
     56 
     57         mChannelConfig = stream.unpackUsbShort();
     58         mChanNameID = stream.getByte();
     59 
     60         int controlArraySize = calcControlArraySize(mNumInputs, mNumOutputs);
     61         mControls = new byte[controlArraySize];
     62         for (int index = 0; index < controlArraySize; index++) {
     63             mControls[index] = stream.getByte();
     64         }
     65 
     66         mNameID = stream.getByte();
     67 
     68         return mLength;
     69     }
     70 
     71     @Override
     72     public void report(ReportCanvas canvas) {
     73         super.report(canvas);
     74 
     75         canvas.writeParagraph("Mixer Unit", false);
     76         canvas.openList();
     77 
     78         canvas.writeListItem("Unit ID: " + ReportCanvas.getHexString(getUnitID()));
     79         byte numInputs = getNumInputs();
     80         byte[] inputIDs = getInputIDs();
     81         canvas.openListItem();
     82         canvas.write("Num Inputs: " + numInputs + " [");
     83         for (int input = 0; input < numInputs; input++) {
     84             canvas.write("" + ReportCanvas.getHexString(inputIDs[input]));
     85             if (input < numInputs - 1) {
     86                 canvas.write(" ");
     87             }
     88         }
     89         canvas.write("]");
     90         canvas.closeListItem();
     91 
     92         canvas.writeListItem("Num Outputs: " + getNumOutputs());
     93         canvas.writeListItem("Channel Config: " + ReportCanvas.getHexString(getChannelConfig()));
     94 
     95         byte[] controls = getControls();
     96         canvas.openListItem();
     97         canvas.write("Controls: " + controls.length + " [");
     98         for (int ctrl = 0; ctrl < controls.length; ctrl++) {
     99             canvas.write("" + controls[ctrl]);
    100             if (ctrl < controls.length - 1) {
    101                 canvas.write(" ");
    102             }
    103         }
    104         canvas.write("]");
    105         canvas.closeListItem();
    106         canvas.closeList();
    107     }
    108 }
    109