/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.hdmi;
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import android.hardware.hdmi.HdmiDeviceInfo;
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import android.hardware.tv.cec.V1_0.SendMessageResult;
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import android.util.Slog;
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/**
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* Feature action that handles enabling/disabling of ARC transmission channel.
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* Once TV gets <Initiate ARC>, TV sends <Report ARC Initiated> to AV Receiver.
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* If it fails or it gets <Terminate ARC>, TV just disables ARC.
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*/
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final class SetArcTransmissionStateAction extends HdmiCecFeatureAction {
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private static final String TAG = "SetArcTransmissionStateAction";
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// State in which the action sent <Rerpot Arc Initiated> and
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// is waiting for time out. If it receives <Feature Abort> within timeout
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// ARC should be disabled.
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private static final int STATE_WAITING_TIMEOUT = 1;
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private final boolean mEnabled;
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private final int mAvrAddress;
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/**
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* @Constructor
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*
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* @param source {@link HdmiCecLocalDevice} instance
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* @param enabled whether to enable ARC Transmission channel
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*/
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SetArcTransmissionStateAction(HdmiCecLocalDevice source, int avrAddress,
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boolean enabled) {
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super(source);
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HdmiUtils.verifyAddressType(getSourceAddress(), HdmiDeviceInfo.DEVICE_TV);
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HdmiUtils.verifyAddressType(avrAddress, HdmiDeviceInfo.DEVICE_AUDIO_SYSTEM);
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mAvrAddress = avrAddress;
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mEnabled = enabled;
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}
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@Override
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boolean start() {
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// Seq #37.
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if (mEnabled) {
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// Enable ARC status immediately before sending <Report Arc Initiated>.
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// If AVR responds with <Feature Abort>, disable ARC status again.
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// This is different from spec that says that turns ARC status to
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// "Enabled" if <Report ARC Initiated> is acknowledged and no
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// <Feature Abort> is received.
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// But implemented this way to save the time having to wait for
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// <Feature Abort>.
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setArcStatus(true);
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// If succeeds to send <Report ARC Initiated>, wait general timeout
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// to check whether there is no <Feature Abort> for <Report ARC Initiated>.
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mState = STATE_WAITING_TIMEOUT;
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addTimer(mState, HdmiConfig.TIMEOUT_MS);
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sendReportArcInitiated();
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} else {
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setArcStatus(false);
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finish();
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}
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return true;
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}
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private void sendReportArcInitiated() {
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HdmiCecMessage command =
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HdmiCecMessageBuilder.buildReportArcInitiated(getSourceAddress(), mAvrAddress);
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sendCommand(command, new HdmiControlService.SendMessageCallback() {
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@Override
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public void onSendCompleted(int error) {
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switch (error) {
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case SendMessageResult.SUCCESS:
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case SendMessageResult.BUSY:
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case SendMessageResult.FAIL:
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// The result of the command transmission, unless it is an obvious
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// failure indicated by the target device (or lack thereof), should
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// not affect the ARC status. Ignores it silently.
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break;
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case SendMessageResult.NACK:
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// If <Report ARC Initiated> is negatively ack'ed, disable ARC and
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// send <Report ARC Terminated> directly.
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setArcStatus(false);
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HdmiLogger.debug("Failed to send <Report Arc Initiated>.");
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finish();
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break;
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}
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}
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});
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}
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private void setArcStatus(boolean enabled) {
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boolean wasEnabled = tv().setArcStatus(enabled);
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Slog.i(TAG, "Change arc status [old:" + wasEnabled + ", new:" + enabled + "]");
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// If enabled before and set to "disabled" and send <Report Arc Terminated> to
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// av reciever.
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if (!enabled && wasEnabled) {
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sendCommand(HdmiCecMessageBuilder.buildReportArcTerminated(getSourceAddress(),
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mAvrAddress));
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}
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}
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@Override
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boolean processCommand(HdmiCecMessage cmd) {
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if (mState != STATE_WAITING_TIMEOUT) {
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return false;
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}
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int opcode = cmd.getOpcode();
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if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
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int originalOpcode = cmd.getParams()[0] & 0xFF;
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if (originalOpcode == Constants.MESSAGE_REPORT_ARC_INITIATED) {
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HdmiLogger.debug("Feature aborted for <Report Arc Initiated>");
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setArcStatus(false);
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finish();
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return true;
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}
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}
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return false;
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}
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@Override
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void handleTimerEvent(int state) {
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if (mState != state || mState != STATE_WAITING_TIMEOUT) {
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return;
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}
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// Expire timeout for <Feature Abort>.
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finish();
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}
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}
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