1 /* 2 * Copyright (C) 2013 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 17 package com.android.accessorydisplay.common; 18 19 /** 20 * Defines message types. 21 */ 22 public class Protocol { 23 // Message header. 24 // 0: service id (16 bits) 25 // 2: what (16 bits) 26 // 4: content size (32 bits) 27 // 8: ... content follows ... 28 static final int HEADER_SIZE = 8; 29 30 // Maximum size of a message envelope including the header and contents. 31 static final int MAX_ENVELOPE_SIZE = 64 * 1024; 32 33 /** 34 * Maximum message content size. 35 */ 36 public static final int MAX_CONTENT_SIZE = MAX_ENVELOPE_SIZE - HEADER_SIZE; 37 38 public static final class DisplaySinkService { 39 private DisplaySinkService() { } 40 41 public static final int ID = 1; 42 43 // Query sink capabilities. 44 // Replies with sink available or not available. 45 public static final int MSG_QUERY = 1; 46 47 // Send MPEG2-TS H.264 encoded content. 48 public static final int MSG_CONTENT = 2; 49 } 50 51 public static final class DisplaySourceService { 52 private DisplaySourceService() { } 53 54 public static final int ID = 2; 55 56 // Sink is now available for use. 57 // 0: width (32 bits) 58 // 4: height (32 bits) 59 // 8: density dpi (32 bits) 60 public static final int MSG_SINK_AVAILABLE = 1; 61 62 // Sink is no longer available for use. 63 public static final int MSG_SINK_NOT_AVAILABLE = 2; 64 } 65 } 66
