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/*
* Copyright (C) 2015 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.tv.receiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.media.AudioFormat;
import android.media.AudioManager;
import com.android.tv.analytics.Tracker;
import java.util.Arrays;
/**
* Creates HDMI plug broadcast receiver, and reports AC3 passthrough capabilities
* to Google Analytics. Call {@link #register} to start receiving notifications,
* and {@link #unregister} to stop.
*/
public final class AudioCapabilitiesReceiver {
private static final String PREFS_NAME = "com.android.tv.audio_capabilities";
private static final String SETTINGS_KEY_AC3_PASSTHRU_REPORTED = "ac3_passthrough_reported";
private static final String SETTINGS_KEY_AC3_PASSTHRU_CAPABILITIES = "ac3_passthrough";
private static final String SETTINGS_KEY_AC3_REPORT_REVISION = "ac3_report_revision";
// AC3 capabilities stat is sent to Google Analytics just once in order to avoid
// duplicated stat reports since it doesn't change over time in most cases.
// Increase this revision when we should force the stat to be sent again.
// TODO: Consier using custom metrics.
private static final int REPORT_REVISION = 1;
private final Context mContext;
private final Tracker mTracker;
private final BroadcastReceiver mReceiver = new HdmiAudioPlugBroadcastReceiver();
/**
* Constructs a new audio capabilities receiver.
*
* @param context context for registering to receive broadcasts
* @param tracker tracker object used to upload capabilities info to Google Analytics
*/
public AudioCapabilitiesReceiver(Context context, Tracker tracker) {
mContext = context;
mTracker = tracker;
}
public void register() {
mContext.registerReceiver(mReceiver, new IntentFilter(AudioManager.ACTION_HDMI_AUDIO_PLUG));
}
public void unregister() {
mContext.unregisterReceiver(mReceiver);
}
private final class HdmiAudioPlugBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (!action.equals(AudioManager.ACTION_HDMI_AUDIO_PLUG)) {
return;
}
reportAudioCapabilities(intent.getIntArrayExtra(AudioManager.EXTRA_ENCODINGS));
}
}
private void reportAudioCapabilities(int[] supportedEncodings) {
boolean newVal = supportedEncodings != null
&& Arrays.binarySearch(supportedEncodings, AudioFormat.ENCODING_AC3) >= 0;
boolean oldVal = getBoolean(SETTINGS_KEY_AC3_PASSTHRU_CAPABILITIES, false);
boolean reported = getBoolean(SETTINGS_KEY_AC3_PASSTHRU_REPORTED, false);
int revision = getInt(SETTINGS_KEY_AC3_REPORT_REVISION, 0);
// Send the value just once. But we send it again if the value changed, to include
// the case where users have switched TV device with different AC3 passthrough capabilities.
if (!reported || oldVal != newVal || REPORT_REVISION > revision) {
mTracker.sendAc3PassthroughCapabilities(newVal);
setBoolean(SETTINGS_KEY_AC3_PASSTHRU_REPORTED, true);
setBoolean(SETTINGS_KEY_AC3_PASSTHRU_CAPABILITIES, newVal);
if (REPORT_REVISION > revision) {
setInt(SETTINGS_KEY_AC3_REPORT_REVISION, REPORT_REVISION);
}
}
}
private SharedPreferences getSharedPreferences() {
return mContext.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
}
private boolean getBoolean(String key, boolean def) {
return getSharedPreferences().getBoolean(key, def);
}
private void setBoolean(String key, boolean val) {
getSharedPreferences().edit().putBoolean(key, val).apply();
}
private int getInt(String key, int def) {
return getSharedPreferences().getInt(key, def);
}
private void setInt(String key, int val) {
getSharedPreferences().edit().putInt(key, val).apply();
}
}
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