| /* |
| * Copyright (C) 2020 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.hdmi; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Buffer for processing the incoming CEC messages while allocating logical addresses. |
| */ |
| final class CecMessageBuffer { |
| private List<HdmiCecMessage> mBuffer = new ArrayList<>(); |
| private HdmiControlService mHdmiControlService; |
| |
| CecMessageBuffer(HdmiControlService hdmiControlService) { |
| mHdmiControlService = hdmiControlService; |
| } |
| |
| /** |
| * Adds a message to the buffer. |
| * Only certain types of messages need to be buffered. |
| * @param message The message to add to the buffer |
| * @return Whether the message was added to the buffer |
| */ |
| public boolean bufferMessage(HdmiCecMessage message) { |
| switch (message.getOpcode()) { |
| case Constants.MESSAGE_ACTIVE_SOURCE: |
| bufferActiveSource(message); |
| return true; |
| case Constants.MESSAGE_IMAGE_VIEW_ON: |
| case Constants.MESSAGE_TEXT_VIEW_ON: |
| bufferImageOrTextViewOn(message); |
| return true; |
| case Constants.MESSAGE_SYSTEM_AUDIO_MODE_REQUEST: |
| bufferSystemAudioModeRequest(message); |
| return true; |
| // Add here if new message that needs to buffer |
| default: |
| // Do not need to buffer messages other than above |
| return false; |
| } |
| } |
| |
| /** |
| * Process all messages in the buffer. |
| */ |
| public void processMessages() { |
| for (final HdmiCecMessage message : mBuffer) { |
| mHdmiControlService.runOnServiceThread(new Runnable() { |
| @Override |
| public void run() { |
| mHdmiControlService.handleCecCommand(message); |
| } |
| }); |
| } |
| mBuffer.clear(); |
| } |
| |
| private void bufferActiveSource(HdmiCecMessage message) { |
| if (!replaceMessageIfBuffered(message, Constants.MESSAGE_ACTIVE_SOURCE)) { |
| mBuffer.add(message); |
| } |
| } |
| |
| private void bufferImageOrTextViewOn(HdmiCecMessage message) { |
| if (!replaceMessageIfBuffered(message, Constants.MESSAGE_IMAGE_VIEW_ON) |
| && !replaceMessageIfBuffered(message, Constants.MESSAGE_TEXT_VIEW_ON)) { |
| mBuffer.add(message); |
| } |
| } |
| |
| private void bufferSystemAudioModeRequest(HdmiCecMessage message) { |
| if (!replaceMessageIfBuffered(message, Constants.MESSAGE_SYSTEM_AUDIO_MODE_REQUEST)) { |
| mBuffer.add(message); |
| } |
| } |
| |
| // Returns true if the message is replaced |
| private boolean replaceMessageIfBuffered(HdmiCecMessage message, int opcode) { |
| for (int i = 0; i < mBuffer.size(); i++) { |
| HdmiCecMessage bufferedMessage = mBuffer.get(i); |
| if (bufferedMessage.getOpcode() == opcode) { |
| mBuffer.set(i, message); |
| return true; |
| } |
| } |
| return false; |
| } |
| } |