SystemAudioAction.java revision 5fba96df30b6b50b3cb9fe1d783320b1cc3bd6ea 
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.annotation.Nullable;
20import android.hardware.hdmi.HdmiCecDeviceInfo;
21import android.hardware.hdmi.HdmiControlManager;
22import android.hardware.hdmi.IHdmiControlCallback;
23import android.os.RemoteException;
24import android.util.Slog;
25
26/**
27 * Base feature action class for SystemAudioActionFromTv and SystemAudioActionFromAvr.
28 */
29abstract class SystemAudioAction extends FeatureAction {
30    private static final String TAG = "SystemAudioAction";
31
32    // State in which waits for <SetSystemAudioMode>.
33    private static final int STATE_WAIT_FOR_SET_SYSTEM_AUDIO_MODE = 1;
34
35    private static final int MAX_SEND_RETRY_COUNT = 2;
36
37    private static final int ON_TIMEOUT_MS = 5000;
38    private static final int OFF_TIMEOUT_MS = HdmiConfig.TIMEOUT_MS;
39
40    // Logical address of AV Receiver.
41    protected final int mAvrLogicalAddress;
42
43    // The target audio status of the action, whether to enable the system audio mode or not.
44    protected boolean mTargetAudioStatus;
45
46    @Nullable private final IHdmiControlCallback mCallback;
47
48    private int mSendRetryCount = 0;
49
50    /**
51     * Constructor
52     *
53     * @param source {@link HdmiCecLocalDevice} instance
54     * @param avrAddress logical address of AVR device
55     * @param targetStatus Whether to enable the system audio mode or not
56     * @param callback callback interface to be notified when it's done
57     * @throw IllegalArugmentException if device type of sourceAddress and avrAddress is invalid
58     */
59    SystemAudioAction(HdmiCecLocalDevice source, int avrAddress, boolean targetStatus,
60            IHdmiControlCallback callback) {
61        super(source);
62        HdmiUtils.verifyAddressType(avrAddress, HdmiCecDeviceInfo.DEVICE_AUDIO_SYSTEM);
63        mAvrLogicalAddress = avrAddress;
64        mTargetAudioStatus = targetStatus;
65        mCallback = callback;
66    }
67
68    protected void sendSystemAudioModeRequest() {
69        int avrPhysicalAddress = tv().getAvrDeviceInfo().getPhysicalAddress();
70        HdmiCecMessage command = HdmiCecMessageBuilder.buildSystemAudioModeRequest(
71                getSourceAddress(),
72                mAvrLogicalAddress, avrPhysicalAddress, mTargetAudioStatus);
73        sendCommand(command, new HdmiControlService.SendMessageCallback() {
74            @Override
75            public void onSendCompleted(int error) {
76                if (error == Constants.SEND_RESULT_SUCCESS) {
77                    mState = STATE_WAIT_FOR_SET_SYSTEM_AUDIO_MODE;
78                    addTimer(mState, mTargetAudioStatus ? ON_TIMEOUT_MS : OFF_TIMEOUT_MS);
79                } else {
80                    setSystemAudioMode(false);
81                    finishWithCallback(HdmiControlManager.RESULT_EXCEPTION);
82                }
83            }
84        });
85    }
86
87    private void handleSendSystemAudioModeRequestTimeout() {
88        if (!mTargetAudioStatus  // Don't retry for Off case.
89                || mSendRetryCount++ >= MAX_SEND_RETRY_COUNT) {
90            setSystemAudioMode(false);
91            finishWithCallback(HdmiControlManager.RESULT_TIMEOUT);
92            return;
93        }
94        sendSystemAudioModeRequest();
95    }
96
97    protected void setSystemAudioMode(boolean mode) {
98        tv().setSystemAudioMode(mode);
99    }
100
101    @Override
102    final boolean processCommand(HdmiCecMessage cmd) {
103        switch (mState) {
104            case STATE_WAIT_FOR_SET_SYSTEM_AUDIO_MODE:
105                // TODO: Handle <FeatureAbort> of <SystemAudioModeRequest>
106                if (cmd.getOpcode() != Constants.MESSAGE_SET_SYSTEM_AUDIO_MODE
107                        || !HdmiUtils.checkCommandSource(cmd, mAvrLogicalAddress, TAG)) {
108                    return false;
109                }
110                boolean receivedStatus = HdmiUtils.parseCommandParamSystemAudioStatus(cmd);
111                if (receivedStatus == mTargetAudioStatus) {
112                    setSystemAudioMode(receivedStatus);
113                    startAudioStatusAction();
114                    return true;
115                } else {
116                    // Unexpected response, consider the request is newly initiated by AVR.
117                    // To return 'false' will initiate new SystemAudioActionFromAvr by the control
118                    // service.
119                    finishWithCallback(HdmiControlManager.RESULT_EXCEPTION);
120                    return false;
121                }
122            default:
123                return false;
124        }
125    }
126
127    protected void startAudioStatusAction() {
128        addAndStartAction(new SystemAudioStatusAction(tv(), mAvrLogicalAddress, mCallback));
129        finish();
130    }
131
132    protected void removeSystemAudioActionInProgress() {
133        removeActionExcept(SystemAudioActionFromTv.class, this);
134        removeActionExcept(SystemAudioActionFromAvr.class, this);
135    }
136
137    @Override
138    final void handleTimerEvent(int state) {
139        if (mState != state) {
140            return;
141        }
142        switch (mState) {
143            case STATE_WAIT_FOR_SET_SYSTEM_AUDIO_MODE:
144                handleSendSystemAudioModeRequestTimeout();
145                return;
146        }
147    }
148
149    // TODO: if IHdmiControlCallback is general to other FeatureAction,
150    //       move it into FeatureAction.
151    protected void finishWithCallback(int returnCode) {
152        if (mCallback != null) {
153            try {
154                mCallback.onComplete(returnCode);
155            } catch (RemoteException e) {
156                Slog.e(TAG, "Failed to invoke callback.", e);
157            }
158        }
159        finish();
160    }
161}
162