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 */
16package com.android.server.usb.descriptors;
17
18/**
19 * @hide
20 * An audio class-specific Mixer Unit interface.
21 * see Audio20.pdf section 4.7.2.6 Mixer Unit Descriptor
22 */
23public final class Usb20ACMixerUnit extends UsbACMixerUnit {
24    private static final String TAG = "Usb20ACMixerUnit";
25
26    private int mChanConfig;    // 6+p:4 Describes the spatial location of the
27                                // logical channels.
28    private byte mChanNames;    // 10+p:1 Index of a string descriptor, describing the
29                                // name of the first logical channel.
30    private byte[] mControls;   // 11+p:N bitmasks of which controls are present for each channel
31                                // for N, see UsbACMixerUnit.calcControlArraySize()
32    private byte mControlsMask; // 11+p+N:1 bitmasks of which controls are present for each channel
33    private byte mNameID;       // 12+p+N:1 Index of a string descriptor, describing the
34                                // Mixer Unit.
35
36    public Usb20ACMixerUnit(int length, byte type, byte subtype, byte subClass) {
37        super(length, type, subtype, subClass);
38    }
39
40    @Override
41    public int parseRawDescriptors(ByteStream stream) {
42        super.parseRawDescriptors(stream);
43
44        mChanConfig = stream.unpackUsbInt();
45        mChanNames = stream.getByte();
46        int controlArraySize = calcControlArraySize(mNumInputs, mNumOutputs);
47        mControls = new byte[controlArraySize];
48        for (int index = 0; index < controlArraySize; index++) {
49            mControls[index] = stream.getByte();
50        }
51        mControlsMask = stream.getByte();
52        mNameID = stream.getByte();
53
54        return mLength;
55    }
56}
57