1 /* 2 * Copyright (C) 2020 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 java.util.ArrayList; 20 import java.util.List; 21 22 /** 23 * Buffer for processing the incoming CEC messages while allocating logical addresses. 24 */ 25 final class CecMessageBuffer { 26 private List<HdmiCecMessage> mBuffer = new ArrayList<>(); 27 private HdmiControlService mHdmiControlService; 28 CecMessageBuffer(HdmiControlService hdmiControlService)29 CecMessageBuffer(HdmiControlService hdmiControlService) { 30 mHdmiControlService = hdmiControlService; 31 } 32 33 /** 34 * Adds a message to the buffer. 35 * Only certain types of messages need to be buffered. 36 * @param message The message to add to the buffer 37 * @return Whether the message was added to the buffer 38 */ bufferMessage(HdmiCecMessage message)39 public boolean bufferMessage(HdmiCecMessage message) { 40 switch (message.getOpcode()) { 41 case Constants.MESSAGE_ACTIVE_SOURCE: 42 bufferActiveSource(message); 43 return true; 44 case Constants.MESSAGE_IMAGE_VIEW_ON: 45 case Constants.MESSAGE_TEXT_VIEW_ON: 46 bufferImageOrTextViewOn(message); 47 return true; 48 case Constants.MESSAGE_SYSTEM_AUDIO_MODE_REQUEST: 49 bufferSystemAudioModeRequest(message); 50 return true; 51 // Add here if new message that needs to buffer 52 default: 53 // Do not need to buffer messages other than above 54 return false; 55 } 56 } 57 58 /** 59 * Process all messages in the buffer. 60 */ processMessages()61 public void processMessages() { 62 for (final HdmiCecMessage message : mBuffer) { 63 mHdmiControlService.runOnServiceThread(new Runnable() { 64 @Override 65 public void run() { 66 mHdmiControlService.handleCecCommand(message); 67 } 68 }); 69 } 70 mBuffer.clear(); 71 } 72 bufferActiveSource(HdmiCecMessage message)73 private void bufferActiveSource(HdmiCecMessage message) { 74 if (!replaceMessageIfBuffered(message, Constants.MESSAGE_ACTIVE_SOURCE)) { 75 mBuffer.add(message); 76 } 77 } 78 bufferImageOrTextViewOn(HdmiCecMessage message)79 private void bufferImageOrTextViewOn(HdmiCecMessage message) { 80 if (!replaceMessageIfBuffered(message, Constants.MESSAGE_IMAGE_VIEW_ON) 81 && !replaceMessageIfBuffered(message, Constants.MESSAGE_TEXT_VIEW_ON)) { 82 mBuffer.add(message); 83 } 84 } 85 bufferSystemAudioModeRequest(HdmiCecMessage message)86 private void bufferSystemAudioModeRequest(HdmiCecMessage message) { 87 if (!replaceMessageIfBuffered(message, Constants.MESSAGE_SYSTEM_AUDIO_MODE_REQUEST)) { 88 mBuffer.add(message); 89 } 90 } 91 92 // Returns true if the message is replaced replaceMessageIfBuffered(HdmiCecMessage message, int opcode)93 private boolean replaceMessageIfBuffered(HdmiCecMessage message, int opcode) { 94 for (int i = 0; i < mBuffer.size(); i++) { 95 HdmiCecMessage bufferedMessage = mBuffer.get(i); 96 if (bufferedMessage.getOpcode() == opcode) { 97 mBuffer.set(i, message); 98 return true; 99 } 100 } 101 return false; 102 } 103 } 104