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      1 /*
      2  * Copyright (C) 2018 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 package com.android.server.hdmi;
     17 
     18 import android.hardware.tv.cec.V1_0.SendMessageResult;
     19 
     20 /**
     21  * Feature action that handles Audio Return Channel initiated by AVR devices.
     22  */
     23 public class ArcInitiationActionFromAvr extends HdmiCecFeatureAction {
     24     // State in which waits for ARC response.
     25     private static final int STATE_WAITING_FOR_INITIATE_ARC_RESPONSE = 1;
     26     private static final int STATE_ARC_INITIATED = 2;
     27 
     28     // the required maximum response time specified in CEC 9.2
     29     private static final int TIMEOUT_MS = 1000;
     30     private static final int MAX_RETRY_COUNT = 5;
     31 
     32     private int mSendRequestActiveSourceRetryCount = 0;
     33 
     34     ArcInitiationActionFromAvr(HdmiCecLocalDevice source) {
     35         super(source);
     36     }
     37 
     38     @Override
     39     boolean start() {
     40         audioSystem().setArcStatus(true);
     41         mState = STATE_WAITING_FOR_INITIATE_ARC_RESPONSE;
     42         addTimer(mState, TIMEOUT_MS);
     43         sendInitiateArc();
     44         return true;
     45     }
     46 
     47     @Override
     48     boolean processCommand(HdmiCecMessage cmd) {
     49         if (mState != STATE_WAITING_FOR_INITIATE_ARC_RESPONSE) {
     50             return false;
     51         }
     52         switch (cmd.getOpcode()) {
     53             case Constants.MESSAGE_FEATURE_ABORT:
     54                 if ((cmd.getParams()[0] & 0xFF) == Constants.MESSAGE_INITIATE_ARC) {
     55                     audioSystem().setArcStatus(false);
     56                     finish();
     57                     return true;
     58                 } else {
     59                     return false;
     60                 }
     61             case Constants.MESSAGE_REPORT_ARC_TERMINATED:
     62                 audioSystem().setArcStatus(false);
     63                 finish();
     64                 return true;
     65             case Constants.MESSAGE_REPORT_ARC_INITIATED:
     66                 mState = STATE_ARC_INITIATED;
     67                 if (audioSystem().getActiveSource().physicalAddress != getSourcePath()
     68                         && audioSystem().isSystemAudioActivated()) {
     69                     sendRequestActiveSource();
     70                 } else {
     71                     finish();
     72                 }
     73                 return true;
     74         }
     75         return false;
     76     }
     77 
     78     @Override
     79     void handleTimerEvent(int state) {
     80         if (mState != state) {
     81             return;
     82         }
     83 
     84         switch (mState) {
     85             case STATE_WAITING_FOR_INITIATE_ARC_RESPONSE:
     86                 handleInitiateArcTimeout();
     87                 break;
     88         }
     89     }
     90 
     91     protected void sendInitiateArc() {
     92         sendCommand(HdmiCecMessageBuilder.buildInitiateArc(getSourceAddress(), Constants.ADDR_TV),
     93                 result -> {
     94                     if (result != SendMessageResult.SUCCESS) {
     95                         audioSystem().setArcStatus(false);
     96                         finish();
     97                     }
     98                 });
     99     }
    100 
    101     private void handleInitiateArcTimeout() {
    102         HdmiLogger.debug("handleInitiateArcTimeout");
    103         audioSystem().setArcStatus(false);
    104         finish();
    105     }
    106 
    107     protected void sendRequestActiveSource() {
    108         sendCommand(HdmiCecMessageBuilder.buildRequestActiveSource(getSourceAddress()),
    109                 result -> {
    110                     if (result != SendMessageResult.SUCCESS) {
    111                         if (mSendRequestActiveSourceRetryCount < MAX_RETRY_COUNT) {
    112                             mSendRequestActiveSourceRetryCount++;
    113                             sendRequestActiveSource();
    114                         } else {
    115                             finish();
    116                         }
    117                     } else {
    118                         finish();
    119                     }
    120                 });
    121     }
    122 }
    123