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
18import com.android.server.usb.descriptors.report.ReportCanvas;
19
20/**
21 * @hide
22 * An audio class-specific Header descriptor.
23 * see Audio20.pdf section 4.7.2 Class-Specific AC Interface Descriptor
24 */
25public final class Usb20ACHeader extends UsbACHeaderInterface {
26    private static final String TAG = "Usb20ACHeader";
27
28    private byte mCategory;     // 5:1 Constant, indicating the primary use of this audio function.
29                                // See audio20.pdf Appendix A.7, “Audio Function Category Codes.”
30    private byte mControls;     // 8:1 See audio20.pdf Table 4-5.
31
32    public Usb20ACHeader(int length, byte type, byte subtype, byte subclass, int spec) {
33        super(length, type, subtype, subclass, spec);
34    }
35
36    public byte getCategory() {
37        return mCategory;
38    }
39
40    public byte getControls() {
41        return mControls;
42    }
43
44    @Override
45    public int parseRawDescriptors(ByteStream stream) {
46        mCategory = stream.getByte();
47        mTotalLength = stream.unpackUsbShort();
48        mControls = stream.getByte();
49
50        return mLength;
51    }
52
53    @Override
54    public void report(ReportCanvas canvas) {
55        super.report(canvas);
56
57        canvas.openList();
58        canvas.writeListItem("Category: " + ReportCanvas.getHexString(getCategory()));
59        canvas.writeListItem("Controls: " + ReportCanvas.getHexString(getControls()));
60        canvas.closeList();
61    }
62}
63