SetArcTransmissionStateAction.java revision 339227da7cf025ce4ae0c85ddc52643d63972321 
1/*
2 * Copyright (C) 2014 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
17package com.android.server.hdmi;
18
19import android.hardware.hdmi.HdmiDeviceInfo;
20import android.util.Slog;
21
22/**
23 * Feature action that handles enabling/disabling of ARC transmission channel.
24 * Once TV gets <Initiate ARC>, TV sends <Report ARC Initiated> to AV Receiver.
25 * If it fails or it gets <Terminate ARC>, TV just disables ARC.
26 */
27final class SetArcTransmissionStateAction extends HdmiCecFeatureAction {
28    private static final String TAG = "SetArcTransmissionStateAction";
29
30    // State in which the action sent <Rerpot Arc Initiated> and
31    // is waiting for time out. If it receives <Feature Abort> within timeout
32    // ARC should be disabled.
33    private static final int STATE_WAITING_TIMEOUT = 1;
34
35    private final boolean mEnabled;
36    private final int mAvrAddress;
37
38    /**
39     * @Constructor
40     *
41     * @param source {@link HdmiCecLocalDevice} instance
42     * @param enabled whether to enable ARC Transmission channel
43     */
44    SetArcTransmissionStateAction(HdmiCecLocalDevice source, int avrAddress,
45            boolean enabled) {
46        super(source);
47        HdmiUtils.verifyAddressType(getSourceAddress(), HdmiDeviceInfo.DEVICE_TV);
48        HdmiUtils.verifyAddressType(avrAddress, HdmiDeviceInfo.DEVICE_AUDIO_SYSTEM);
49        mAvrAddress = avrAddress;
50        mEnabled = enabled;
51    }
52
53    @Override
54    boolean start() {
55        if (mEnabled) {
56            sendReportArcInitiated();
57        } else {
58            setArcStatus(false);
59            finish();
60        }
61        return true;
62    }
63
64    private void sendReportArcInitiated() {
65        HdmiCecMessage command =
66                HdmiCecMessageBuilder.buildReportArcInitiated(getSourceAddress(), mAvrAddress);
67        sendCommand(command, new HdmiControlService.SendMessageCallback() {
68            @Override
69            public void onSendCompleted(int error) {
70                if (error == Constants.SEND_RESULT_SUCCESS) {
71                    // Enable ARC status immediately after sending <Report Arc Initiated>.
72                    // If AVR responds with <Feature Abort>, disable ARC status again.
73                    // This is different from spec that says that turns ARC status to
74                    // "Enabled" if <Report ARC Initiated> is acknowledged and no
75                    // <Feature Abort> is received.
76                    // But implemented this way to save the time having to wait for
77                    // <Feature Abort>.
78                    setArcStatus(true);
79                    // If succeeds to send <Report ARC Initiated>, wait general timeout
80                    // to check whether there is no <Feature Abort> for <Report ARC Initiated>.
81                    mState = STATE_WAITING_TIMEOUT;
82                    addTimer(mState, HdmiConfig.TIMEOUT_MS);
83                } else {
84                    // If fails to send <Report ARC Initiated>, disable ARC and
85                    // send <Report ARC Terminated> directly.
86                    setArcStatus(false);
87                    finish();
88                }
89            }
90        });
91    }
92
93    private void setArcStatus(boolean enabled) {
94        boolean wasEnabled = tv().setArcStatus(enabled);
95        Slog.i(TAG, "Change arc status [old:" + wasEnabled + " ,new:" + enabled);
96
97        // If enabled before and set to "disabled" and send <Report Arc Terminated> to
98        // av reciever.
99        if (!enabled && wasEnabled) {
100            sendCommand(HdmiCecMessageBuilder.buildReportArcTerminated(getSourceAddress(),
101                    mAvrAddress));
102        }
103    }
104
105    @Override
106    boolean processCommand(HdmiCecMessage cmd) {
107        if (mState != STATE_WAITING_TIMEOUT) {
108            return false;
109        }
110
111        int opcode = cmd.getOpcode();
112        if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
113            int originalOpcode = cmd.getParams()[0] & 0xFF;
114            if (originalOpcode == Constants.MESSAGE_REPORT_ARC_INITIATED) {
115                setArcStatus(false);
116                finish();
117                return true;
118            }
119        }
120        return false;
121    }
122
123    @Override
124    void handleTimerEvent(int state) {
125        if (mState != state || mState != STATE_WAITING_TIMEOUT) {
126            return;
127        }
128        // Expire timeout for <Feature Abort>.
129        finish();
130    }
131}
132