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/*
* Copyright 2014, 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.telecom;
import android.content.Context;
import android.media.AudioManager;
import android.media.ToneGenerator;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.provider.Settings;
import com.android.internal.util.Preconditions;
// TODO: Needed for move to system service: import com.android.internal.R;
/**
* Plays DTMF tones locally for the caller to hear. In order to reduce (1) the amount of times we
* check the "play local tones" setting and (2) the length of time we keep the tone generator, this
* class employs a concept of a call "session" that starts and stops when the foreground call
* changes.
*/
class DtmfLocalTonePlayer extends CallsManagerListenerBase {
/** Generator used to actually play the tone. */
private ToneGenerator mToneGenerator;
/** The current call associated with an existing dtmf session. */
private Call mCall;
/** The context. */
private final Context mContext;
/**
* Message codes to be used for creating and deleting ToneGenerator object in the tonegenerator
* thread.
*/
private static final int EVENT_CREATE_OBJECT = 1;
private static final int EVENT_DELETE_OBJECT = 2;
/** Handler running on the tonegenerator thread. */
private Handler mHandler;
public DtmfLocalTonePlayer(Context context) {
mContext = context;
}
/** {@inheritDoc} */
@Override
public void onForegroundCallChanged(Call oldForegroundCall, Call newForegroundCall) {
endDtmfSession(oldForegroundCall);
startDtmfSession(newForegroundCall);
}
/**
* Starts playing the dtmf tone specified by c.
*
* @param call The associated call.
* @param c The digit to play.
*/
void playTone(Call call, char c) {
// Do nothing if it is not the right call.
if (mCall != call) {
return;
}
synchronized(this) {
if (mToneGenerator == null) {
Log.d(this, "playTone: mToneGenerator == null, %c.", c);
} else {
Log.d(this, "starting local tone: %c.", c);
int tone = getMappedTone(c);
if (tone != ToneGenerator.TONE_UNKNOWN) {
mToneGenerator.startTone(tone, -1 /* toneDuration */);
}
}
}
}
/**
* Stops any currently playing dtmf tone.
*
* @param call The associated call.
*/
void stopTone(Call call) {
// Do nothing if it's not the right call.
if (mCall != call) {
return;
}
synchronized(this) {
if (mToneGenerator == null) {
Log.d(this, "stopTone: mToneGenerator == null.");
} else {
Log.d(this, "stopping local tone.");
mToneGenerator.stopTone();
}
}
}
/**
* Runs initialization requires to play local tones during a call.
*
* @param call The call associated with this dtmf session.
*/
private void startDtmfSession(Call call) {
if (call == null) {
return;
}
final Context context = call.getContext();
final boolean areLocalTonesEnabled;
if (context.getResources().getBoolean(R.bool.allow_local_dtmf_tones)) {
areLocalTonesEnabled = Settings.System.getInt(
context.getContentResolver(), Settings.System.DTMF_TONE_WHEN_DIALING, 1) == 1;
} else {
areLocalTonesEnabled = false;
}
mCall = call;
if (areLocalTonesEnabled) {
Log.d(this, "Posting create.");
postMessage(EVENT_CREATE_OBJECT);
}
}
/**
* Releases resources needed for playing local dtmf tones.
*
* @param call The call associated with the session to end.
*/
private void endDtmfSession(Call call) {
if (call != null && mCall == call) {
// Do a stopTone() in case the sessions ends before we are told to stop the tone.
stopTone(call);
mCall = null;
Log.d(this, "Posting delete.");
postMessage(EVENT_DELETE_OBJECT);
}
}
/**
* Posts a message to the tonegenerator-thread handler. Creates the handler if the handler
* has not been instantiated.
*
* @param messageCode The message to post.
*/
private void postMessage(int messageCode) {
synchronized(this) {
if (mHandler == null) {
mHandler = getNewHandler();
}
if (mHandler == null) {
Log.d(this, "Message %d skipped because there is no handler.", messageCode);
} else {
mHandler.obtainMessage(messageCode, null).sendToTarget();
}
}
}
/**
* Creates a new tonegenerator Handler running in its own thread.
*/
private Handler getNewHandler() {
Preconditions.checkState(mHandler == null);
HandlerThread thread = new HandlerThread("tonegenerator-dtmf");
thread.start();
return new Handler(thread.getLooper()) {
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case EVENT_CREATE_OBJECT:
synchronized(DtmfLocalTonePlayer.this) {
if (mToneGenerator == null) {
try {
mToneGenerator = new ToneGenerator(
AudioManager.STREAM_DTMF, 80);
} catch (RuntimeException e) {
Log.e(this, e, "Error creating local tone generator.");
mToneGenerator = null;
}
}
}
break;
case EVENT_DELETE_OBJECT:
synchronized(DtmfLocalTonePlayer.this) {
if (mToneGenerator != null) {
mToneGenerator.release();
mToneGenerator = null;
}
// Delete the handler after the tone generator object is deleted by
// the tonegenerator thread.
if (mHandler != null && !mHandler.hasMessages(EVENT_CREATE_OBJECT)) {
// Stop the handler only if there are no pending CREATE messages.
mHandler.removeMessages(EVENT_DELETE_OBJECT);
mHandler.getLooper().quitSafely();
mHandler = null;
}
}
break;
}
}
};
}
private static final int getMappedTone(char digit) {
if (digit >= '0' && digit <= '9') {
return ToneGenerator.TONE_DTMF_0 + digit - '0';
} else if (digit == '#') {
return ToneGenerator.TONE_DTMF_P;
} else if (digit == '*') {
return ToneGenerator.TONE_DTMF_S;
}
return ToneGenerator.TONE_UNKNOWN;
}
}
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