| /* |
| * 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; |
| } |
| } |