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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.server.audio;
import android.content.Context;
import android.hardware.devicestate.DeviceStateManager;
import android.hardware.devicestate.DeviceStateManager.FoldStateListener;
import android.hardware.display.DisplayManager;
import android.hardware.display.DisplayManagerGlobal;
import android.media.AudioSystem;
import android.os.Handler;
import android.os.HandlerExecutor;
import android.util.Log;
import android.view.Display;
import android.view.Surface;
/**
* Class to handle device rotation events for AudioService, and forward device rotation
* and folded state to the audio HALs through AudioSystem.
*
* The role of this class is to monitor device orientation changes, and upon rotation,
* verify the UI orientation. In case of a change, send the new orientation, in increments
* of 90deg, through AudioSystem.
*
* Another role of this class is to track device folded state changes. In case of a
* change, send the new folded state through AudioSystem.
*
* Note that even though we're responding to device orientation events, we always
* query the display rotation so audio stays in sync with video/dialogs. This is
* done with .getDefaultDisplay().getRotation() from WINDOW_SERVICE.
*
* We also monitor current display ID and audio is able to know which display is active.
*/
class RotationHelper {
private static final String TAG = "AudioService.RotationHelper";
private static final boolean DEBUG_ROTATION = false;
private static AudioDisplayListener sDisplayListener;
private static FoldStateListener sFoldStateListener;
private static final Object sRotationLock = new Object();
private static final Object sFoldStateLock = new Object();
private static int sDeviceRotation = Surface.ROTATION_0; // R/W synchronized on sRotationLock
private static boolean sDeviceFold = true; // R/W synchronized on sFoldStateLock
private static Context sContext;
private static Handler sHandler;
/**
* post conditions:
* - sDisplayListener != null
* - sContext != null
*/
static void init(Context context, Handler handler) {
if (context == null) {
throw new IllegalArgumentException("Invalid null context");
}
sContext = context;
sHandler = handler;
sDisplayListener = new AudioDisplayListener();
enable();
}
static void enable() {
((DisplayManager) sContext.getSystemService(Context.DISPLAY_SERVICE))
.registerDisplayListener(sDisplayListener, sHandler);
updateOrientation();
sFoldStateListener = new FoldStateListener(sContext, folded -> updateFoldState(folded));
sContext.getSystemService(DeviceStateManager.class)
.registerCallback(new HandlerExecutor(sHandler), sFoldStateListener);
}
static void disable() {
((DisplayManager) sContext.getSystemService(Context.DISPLAY_SERVICE))
.unregisterDisplayListener(sDisplayListener);
sContext.getSystemService(DeviceStateManager.class)
.unregisterCallback(sFoldStateListener);
}
/**
* Query current display rotation and publish the change if any.
*/
static void updateOrientation() {
// Even though we're responding to device orientation events,
// use display rotation so audio stays in sync with video/dialogs
// TODO(b/148458001): Support multi-display
int newRotation = DisplayManagerGlobal.getInstance()
.getDisplayInfo(Display.DEFAULT_DISPLAY).rotation;
synchronized(sRotationLock) {
if (newRotation != sDeviceRotation) {
sDeviceRotation = newRotation;
publishRotation(sDeviceRotation);
}
}
}
private static void publishRotation(int rotation) {
if (DEBUG_ROTATION) {
Log.i(TAG, "publishing device rotation =" + rotation + " (x90deg)");
}
switch (rotation) {
case Surface.ROTATION_0:
AudioSystem.setParameters("rotation=0");
break;
case Surface.ROTATION_90:
AudioSystem.setParameters("rotation=90");
break;
case Surface.ROTATION_180:
AudioSystem.setParameters("rotation=180");
break;
case Surface.ROTATION_270:
AudioSystem.setParameters("rotation=270");
break;
default:
Log.e(TAG, "Unknown device rotation");
}
}
/**
* publish the change of device folded state if any.
*/
static void updateFoldState(boolean newFolded) {
synchronized (sFoldStateLock) {
if (sDeviceFold != newFolded) {
sDeviceFold = newFolded;
if (newFolded) {
AudioSystem.setParameters("device_folded=on");
} else {
AudioSystem.setParameters("device_folded=off");
}
}
}
}
/**
* Uses android.hardware.display.DisplayManager.DisplayListener
*/
final static class AudioDisplayListener implements DisplayManager.DisplayListener {
@Override
public void onDisplayAdded(int displayId) {
}
@Override
public void onDisplayRemoved(int displayId) {
}
@Override
public void onDisplayChanged(int displayId) {
if (DEBUG_ROTATION) {
Log.i(TAG, "onDisplayChanged diplayId:" + displayId);
}
updateOrientation();
}
}
}
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