| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.server.usb.descriptors; |
| |
| import android.util.Log; |
| |
| /** |
| * @hide |
| * A video class-specific Interface. |
| * see USB_Video_Class_1.1.pdf, section 3.7.2 |
| */ |
| public abstract class UsbVCInterface extends UsbDescriptor { |
| private static final String TAG = "UsbVCInterface"; |
| |
| // Class-specific Video Subtypes |
| public static final byte VCI_UNDEFINED = 0x00; |
| public static final byte VCI_VEADER = 0x01; |
| public static final byte VCI_INPUT_TERMINAL = 0x02; |
| public static final byte VCI_OUTPUT_TERMINAL = 0x03; |
| public static final byte VCI_SELECTOR_UNIT = 0x04; |
| public static final byte VCI_PROCESSING_UNIT = 0x05; |
| public static final byte VCI_EXTENSION_UNIT = 0x06; |
| |
| // See “Universal Serial Bus Device Class Definition for Video |
| protected final byte mSubtype; // 2:1 HEADER descriptor subtype |
| |
| public UsbVCInterface(int length, byte type, byte subtype) { |
| super(length, type); |
| mSubtype = subtype; |
| } |
| |
| /** |
| * Allocates an audio class interface subtype based on subtype and subclass. |
| */ |
| public static UsbDescriptor allocDescriptor(UsbDescriptorParser parser, ByteStream stream, |
| int length, byte type) { |
| byte subtype = stream.getByte(); |
| UsbInterfaceDescriptor interfaceDesc = parser.getCurInterface(); |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " Video Class-specific Interface subtype: " + subtype); |
| } |
| switch (subtype) { |
| // TODO - Create descriptor classes and parse these... |
| case VCI_UNDEFINED: |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_UNDEFINED"); |
| } |
| break; |
| |
| case VCI_VEADER: |
| { |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_VEADER"); |
| } |
| int vcInterfaceSpec = stream.unpackUsbShort(); |
| parser.setVCInterfaceSpec(vcInterfaceSpec); |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " vcInterfaceSpec:0x" + Integer.toHexString(vcInterfaceSpec)); |
| } |
| return new UsbVCHeader(length, type, subtype, vcInterfaceSpec); |
| } |
| |
| case VCI_INPUT_TERMINAL: |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_INPUT_TERMINAL"); |
| } |
| return new UsbVCInputTerminal(length, type, subtype); |
| |
| case VCI_OUTPUT_TERMINAL: |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_OUTPUT_TERMINAL"); |
| } |
| return new UsbVCOutputTerminal(length, type, subtype); |
| |
| case VCI_SELECTOR_UNIT: |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_SELECTOR_UNIT"); |
| } |
| return new UsbVCSelectorUnit(length, type, subtype); |
| |
| case VCI_PROCESSING_UNIT: |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_PROCESSING_UNIT"); |
| } |
| return new UsbVCProcessingUnit(length, type, subtype); |
| |
| case VCI_EXTENSION_UNIT: |
| if (UsbDescriptorParser.DEBUG) { |
| Log.d(TAG, " ---> VCI_EXTENSION_UNIT"); |
| } |
| break; |
| |
| default: |
| Log.w(TAG, "Unknown Video Class Interface subtype: 0x" |
| + Integer.toHexString(subtype)); |
| return null; |
| } |
| |
| return null; |
| } |
| } |