1 /* 2 * Copyright (C) 2014 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.server.hdmi; 18 19 import android.hardware.hdmi.HdmiDeviceInfo; 20 import java.util.ArrayList; 21 import java.util.Iterator; 22 23 /** 24 * Buffer storage to keep incoming messages for later processing. Used to 25 * handle messages that arrive when the device is not ready. Useful when 26 * keeping the messages from a connected device which are not discovered yet. 27 */ 28 final class DelayedMessageBuffer { 29 private final ArrayList<HdmiCecMessage> mBuffer = new ArrayList<>(); 30 private final HdmiCecLocalDevice mDevice; 31 32 DelayedMessageBuffer(HdmiCecLocalDevice device) { 33 mDevice = device; 34 } 35 36 /** 37 * Add a new message to the buffer. The buffer keeps selected messages in 38 * the order they are received. 39 * 40 * @param message {@link HdmiCecMessage} to add 41 */ 42 void add(HdmiCecMessage message) { 43 boolean buffered = true; 44 45 // Note that all the messages are not handled in the same manner. 46 // For <Active Source> we keep the latest one only. 47 // TODO: This might not be the best way to choose the active source. 48 // Devise a better way to pick up the best one. 49 switch (message.getOpcode()) { 50 case Constants.MESSAGE_ACTIVE_SOURCE: 51 removeActiveSource(); 52 mBuffer.add(message); 53 break; 54 case Constants.MESSAGE_INITIATE_ARC: 55 case Constants.MESSAGE_SET_SYSTEM_AUDIO_MODE: 56 mBuffer.add(message); 57 break; 58 default: 59 buffered = false; 60 break; 61 } 62 if (buffered) { 63 HdmiLogger.debug("Buffering message:" + message); 64 } 65 } 66 67 private void removeActiveSource() { 68 // Uses iterator to remove elements while looping through the list. 69 for (Iterator<HdmiCecMessage> iter = mBuffer.iterator(); iter.hasNext(); ) { 70 HdmiCecMessage message = iter.next(); 71 if (message.getOpcode() == Constants.MESSAGE_ACTIVE_SOURCE) { 72 iter.remove(); 73 } 74 } 75 } 76 77 boolean isBuffered(int opcode) { 78 for (HdmiCecMessage message : mBuffer) { 79 if (message.getOpcode() == opcode) { 80 return true; 81 } 82 } 83 return false; 84 } 85 86 void processAllMessages() { 87 // Use the copied buffer. 88 ArrayList<HdmiCecMessage> copiedBuffer = new ArrayList<HdmiCecMessage>(mBuffer); 89 mBuffer.clear(); 90 for (HdmiCecMessage message : copiedBuffer) { 91 mDevice.onMessage(message); 92 HdmiLogger.debug("Processing message:" + message); 93 } 94 } 95 96 /** 97 * Process messages from a given logical device. Called by 98 * {@link NewDeviceAction} actions when they finish adding the device 99 * information. 100 * <p><Active Source> is processed only when the TV input is ready. 101 * If not, {@link #processActiveSource()} will be invoked later to handle it. 102 * 103 * @param address logical address of CEC device which the messages to process 104 * are associated with 105 */ 106 void processMessagesForDevice(int address) { 107 ArrayList<HdmiCecMessage> copiedBuffer = new ArrayList<HdmiCecMessage>(mBuffer); 108 mBuffer.clear(); 109 HdmiLogger.debug("Checking message for address:" + address); 110 for (HdmiCecMessage message : copiedBuffer) { 111 if (message.getSource() != address) { 112 mBuffer.add(message); 113 continue; 114 } 115 if (message.getOpcode() == Constants.MESSAGE_ACTIVE_SOURCE 116 && !mDevice.isInputReady(HdmiDeviceInfo.idForCecDevice(address))) { 117 mBuffer.add(message); 118 continue; 119 } 120 mDevice.onMessage(message); 121 HdmiLogger.debug("Processing message:" + message); 122 } 123 } 124 125 /** 126 * Process <Active Source>. 127 * 128 * <p>The message has a dependency on TV input framework. Should be invoked 129 * after we get the callback 130 * {@link android.media.tv.TvInputManager.TvInputCallback#onInputAdded(String)} 131 * to ensure the processing of the message takes effect when transformed 132 * to input change callback. 133 * 134 * @param address logical address of the device to be the active source 135 */ 136 void processActiveSource(int address) { 137 ArrayList<HdmiCecMessage> copiedBuffer = new ArrayList<HdmiCecMessage>(mBuffer); 138 mBuffer.clear(); 139 for (HdmiCecMessage message : copiedBuffer) { 140 if (message.getOpcode() == Constants.MESSAGE_ACTIVE_SOURCE 141 && message.getSource() == address) { 142 mDevice.onMessage(message); 143 HdmiLogger.debug("Processing message:" + message); 144 } else { 145 mBuffer.add(message); 146 } 147 } 148 } 149 } 150
