content: /*
   * Copyright (C) 2014 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 android.hardware.tv.cec.V1_0.SendMessageResult;
  import com.android.server.hdmi.HdmiControlService.SendMessageCallback;
  
  /**
   * Action to initiate system audio once AVR is detected on Device discovery action.
   */
  // Seq #27
  final class SystemAudioAutoInitiationAction extends HdmiCecFeatureAction {
      private final int mAvrAddress;
  
      // State that waits for <System Audio Mode Status> once send
      // <Give System Audio Mode Status> to AV Receiver.
      private static final int STATE_WAITING_FOR_SYSTEM_AUDIO_MODE_STATUS = 1;
  
      SystemAudioAutoInitiationAction(HdmiCecLocalDevice source, int avrAddress) {
          super(source);
          mAvrAddress = avrAddress;
      }
  
      @Override
      boolean start() {
          mState = STATE_WAITING_FOR_SYSTEM_AUDIO_MODE_STATUS;
  
          addTimer(mState, HdmiConfig.TIMEOUT_MS);
          sendGiveSystemAudioModeStatus();
          return true;
      }
  
      private void sendGiveSystemAudioModeStatus() {
          sendCommand(HdmiCecMessageBuilder.buildGiveSystemAudioModeStatus(getSourceAddress(),
                  mAvrAddress), new SendMessageCallback() {
              @Override
              public void onSendCompleted(int error) {
                  if (error != SendMessageResult.SUCCESS) {
                      handleSystemAudioModeStatusTimeout();
                  }
              }
          });
      }
  
      @Override
      boolean processCommand(HdmiCecMessage cmd) {
          if (mState != STATE_WAITING_FOR_SYSTEM_AUDIO_MODE_STATUS
                  || mAvrAddress != cmd.getSource()) {
              return false;
          }
  
          if (cmd.getOpcode() == Constants.MESSAGE_SYSTEM_AUDIO_MODE_STATUS) {
              handleSystemAudioModeStatusMessage(HdmiUtils.parseCommandParamSystemAudioStatus(cmd));
              return true;
          }
          return false;
      }
  
      private void handleSystemAudioModeStatusMessage(boolean currentSystemAudioMode) {
          if (!canChangeSystemAudio()) {
              HdmiLogger.debug("Cannot change system audio mode in auto initiation action.");
              finish();
              return;
          }
  
          // If System Audio Control feature is enabled, turn on system audio mode when new AVR is
          // detected. Otherwise, turn off system audio mode.
          boolean targetSystemAudioMode = tv().isSystemAudioControlFeatureEnabled();
          if (currentSystemAudioMode != targetSystemAudioMode) {
              // Start System Audio Control feature actions only if necessary.
              addAndStartAction(
                      new SystemAudioActionFromTv(tv(), mAvrAddress, targetSystemAudioMode, null));
          } else {
              // If AVR already has correct system audio mode, update target system audio mode
              // immediately rather than starting feature action.
              tv().setSystemAudioMode(targetSystemAudioMode);
          }
          finish();
      }
  
      @Override
      void handleTimerEvent(int state) {
          if (mState != state) {
              return;
          }
  
          switch (mState) {
              case STATE_WAITING_FOR_SYSTEM_AUDIO_MODE_STATUS:
                  handleSystemAudioModeStatusTimeout();
                  break;
          }
      }
  
      private void handleSystemAudioModeStatusTimeout() {
          if (!canChangeSystemAudio()) {
              HdmiLogger.debug("Cannot change system audio mode in auto initiation action.");
              finish();
              return;
          }
          // If we can't get the current system audio mode status, just try to turn on/off system
          // audio mode according to the system audio control setting.
          addAndStartAction(new SystemAudioActionFromTv(tv(), mAvrAddress,
                  tv().isSystemAudioControlFeatureEnabled(), null));
          finish();
      }
  
      private boolean canChangeSystemAudio() {
          return !(tv().hasAction(SystemAudioActionFromTv.class)
                 || tv().hasAction(SystemAudioActionFromAvr.class));
      }
  }
  