Google Git
Sign in
android / platform / frameworks / base / 705d2ea63a4b3c2345af83eec9dabdeea29cfa9f / . / core / java / android / speech / tts / TextToSpeech.java
blob: 4b194692f195f1a30746fb2618b1b4c5e3eea421 [file] [log] [blame]
/*
* Copyright (C) 2009 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 android.speech.tts;
import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.Log;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
/**
*
* Synthesizes speech from text for immediate playback or to create a sound file.
* <p>A TextToSpeech instance can only be used to synthesize text once it has completed its
* initialization. Implement the {@link TextToSpeech.OnInitListener} to be
* notified of the completion of the initialization.<br>
* When you are done using the TextToSpeech instance, call the {@link #shutdown()} method
* to release the native resources used by the TextToSpeech engine.
*
*/
public class TextToSpeech {
private static final String TAG = "TextToSpeech";
/**
* Denotes a successful operation.
*/
public static final int SUCCESS = 0;
/**
* Denotes a generic operation failure.
*/
public static final int ERROR = -1;
/**
* Queue mode where all entries in the playback queue (media to be played
* and text to be synthesized) are dropped and replaced by the new entry.
*/
public static final int QUEUE_FLUSH = 0;
/**
* Queue mode where the new entry is added at the end of the playback queue.
*/
public static final int QUEUE_ADD = 1;
/**
* Denotes the language is available exactly as specified by the locale.
*/
public static final int LANG_COUNTRY_VAR_AVAILABLE = 2;
/**
* Denotes the language is available for the language and country specified
* by the locale, but not the variant.
*/
public static final int LANG_COUNTRY_AVAILABLE = 1;
/**
* Denotes the language is available for the language by the locale,
* but not the country and variant.
*/
public static final int LANG_AVAILABLE = 0;
/**
* Denotes the language data is missing.
*/
public static final int LANG_MISSING_DATA = -1;
/**
* Denotes the language is not supported.
*/
public static final int LANG_NOT_SUPPORTED = -2;
/**
* Broadcast Action: The TextToSpeech synthesizer has completed processing
* of all the text in the speech queue.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_TTS_QUEUE_PROCESSING_COMPLETED =
"android.speech.tts.TTS_QUEUE_PROCESSING_COMPLETED";
/**
* Interface definition of a callback to be invoked indicating the completion of the
* TextToSpeech engine initialization.
*/
public interface OnInitListener {
/**
* Called to signal the completion of the TextToSpeech engine initialization.
*
* @param status {@link TextToSpeech#SUCCESS} or {@link TextToSpeech#ERROR}.
*/
public void onInit(int status);
}
/**
* Listener that will be called when the TTS service has
* completed synthesizing an utterance. This is only called if the utterance
* has an utterance ID (see {@link TextToSpeech.Engine#KEY_PARAM_UTTERANCE_ID}).
*/
public interface OnUtteranceCompletedListener {
/**
* Called when an utterance has been synthesized.
*
* @param utteranceId the identifier of the utterance.
*/
public void onUtteranceCompleted(String utteranceId);
}
/**
* Constants and parameter names for controlling text-to-speech.
*/
public class Engine {
/**
* Default speech rate.
* @hide
*/
public static final int DEFAULT_RATE = 100;
/**
* Default pitch.
* @hide
*/
public static final int DEFAULT_PITCH = 100;
/**
* Default volume.
* @hide
*/
public static final float DEFAULT_VOLUME = 1.0f;
/**
* Default pan (centered).
* @hide
*/
public static final float DEFAULT_PAN = 0.0f;
/**
* Default value for {@link Settings.Secure#TTS_USE_DEFAULTS}.
* @hide
*/
public static final int USE_DEFAULTS = 0; // false
/**
* Package name of the default TTS engine.
*
* TODO: This should come from a system property
*
* @hide
*/
public static final String DEFAULT_ENGINE = "com.svox.pico";
/**
* Default audio stream used when playing synthesized speech.
*/
public static final int DEFAULT_STREAM = AudioManager.STREAM_MUSIC;
/**
* Indicates success when checking the installation status of the resources used by the
* TextToSpeech engine with the {@link #ACTION_CHECK_TTS_DATA} intent.
*/
public static final int CHECK_VOICE_DATA_PASS = 1;
/**
* Indicates failure when checking the installation status of the resources used by the
* TextToSpeech engine with the {@link #ACTION_CHECK_TTS_DATA} intent.
*/
public static final int CHECK_VOICE_DATA_FAIL = 0;
/**
* Indicates erroneous data when checking the installation status of the resources used by
* the TextToSpeech engine with the {@link #ACTION_CHECK_TTS_DATA} intent.
*/
public static final int CHECK_VOICE_DATA_BAD_DATA = -1;
/**
* Indicates missing resources when checking the installation status of the resources used
* by the TextToSpeech engine with the {@link #ACTION_CHECK_TTS_DATA} intent.
*/
public static final int CHECK_VOICE_DATA_MISSING_DATA = -2;
/**
* Indicates missing storage volume when checking the installation status of the resources
* used by the TextToSpeech engine with the {@link #ACTION_CHECK_TTS_DATA} intent.
*/
public static final int CHECK_VOICE_DATA_MISSING_VOLUME = -3;
/**
* Intent for starting a TTS service. Services that handle this intent must
* extend {@link TextToSpeechService}. Normal applications should not use this intent
* directly, instead they should talk to the TTS service using the the methods in this
* class.
*/
@SdkConstant(SdkConstantType.SERVICE_ACTION)
public static final String INTENT_ACTION_TTS_SERVICE =
"android.intent.action.TTS_SERVICE";
// intents to ask engine to install data or check its data
/**
* Activity Action: Triggers the platform TextToSpeech engine to
* start the activity that installs the resource files on the device
* that are required for TTS to be operational. Since the installation
* of the data can be interrupted or declined by the user, the application
* shouldn't expect successful installation upon return from that intent,
* and if need be, should check installation status with
* {@link #ACTION_CHECK_TTS_DATA}.
*/
@SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
public static final String ACTION_INSTALL_TTS_DATA =
"android.speech.tts.engine.INSTALL_TTS_DATA";
/**
* Broadcast Action: broadcast to signal the completion of the installation of
* the data files used by the synthesis engine. Success or failure is indicated in the
* {@link #EXTRA_TTS_DATA_INSTALLED} extra.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_TTS_DATA_INSTALLED =
"android.speech.tts.engine.TTS_DATA_INSTALLED";
/**
* Activity Action: Starts the activity from the platform TextToSpeech
* engine to verify the proper installation and availability of the
* resource files on the system. Upon completion, the activity will
* return one of the following codes:
* {@link #CHECK_VOICE_DATA_PASS},
* {@link #CHECK_VOICE_DATA_FAIL},
* {@link #CHECK_VOICE_DATA_BAD_DATA},
* {@link #CHECK_VOICE_DATA_MISSING_DATA}, or
* {@link #CHECK_VOICE_DATA_MISSING_VOLUME}.
* <p> Moreover, the data received in the activity result will contain the following
* fields:
* <ul>
* <li>{@link #EXTRA_VOICE_DATA_ROOT_DIRECTORY} which
* indicates the path to the location of the resource files,</li>
* <li>{@link #EXTRA_VOICE_DATA_FILES} which contains
* the list of all the resource files,</li>
* <li>and {@link #EXTRA_VOICE_DATA_FILES_INFO} which
* contains, for each resource file, the description of the language covered by
* the file in the xxx-YYY format, where xxx is the 3-letter ISO language code,
* and YYY is the 3-letter ISO country code.</li>
* </ul>
*/
@SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
public static final String ACTION_CHECK_TTS_DATA =
"android.speech.tts.engine.CHECK_TTS_DATA";
/**
* Activity intent for getting some sample text to use for demonstrating TTS.
*
* @hide This intent was used by engines written against the old API.
* Not sure if it should be exposed.
*/
@SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
public static final String ACTION_GET_SAMPLE_TEXT =
"android.speech.tts.engine.GET_SAMPLE_TEXT";
// extras for a TTS engine's check data activity
/**
* Extra information received with the {@link #ACTION_CHECK_TTS_DATA} intent where
* the TextToSpeech engine specifies the path to its resources.
*/
public static final String EXTRA_VOICE_DATA_ROOT_DIRECTORY = "dataRoot";
/**
* Extra information received with the {@link #ACTION_CHECK_TTS_DATA} intent where
* the TextToSpeech engine specifies the file names of its resources under the
* resource path.
*/
public static final String EXTRA_VOICE_DATA_FILES = "dataFiles";
/**
* Extra information received with the {@link #ACTION_CHECK_TTS_DATA} intent where
* the TextToSpeech engine specifies the locale associated with each resource file.
*/
public static final String EXTRA_VOICE_DATA_FILES_INFO = "dataFilesInfo";
/**
* Extra information received with the {@link #ACTION_CHECK_TTS_DATA} intent where
* the TextToSpeech engine returns an ArrayList<String> of all the available voices.
* The format of each voice is: lang-COUNTRY-variant where COUNTRY and variant are
* optional (ie, "eng" or "eng-USA" or "eng-USA-FEMALE").
*/
public static final String EXTRA_AVAILABLE_VOICES = "availableVoices";
/**
* Extra information received with the {@link #ACTION_CHECK_TTS_DATA} intent where
* the TextToSpeech engine returns an ArrayList<String> of all the unavailable voices.
* The format of each voice is: lang-COUNTRY-variant where COUNTRY and variant are
* optional (ie, "eng" or "eng-USA" or "eng-USA-FEMALE").
*/
public static final String EXTRA_UNAVAILABLE_VOICES = "unavailableVoices";
/**
* Extra information sent with the {@link #ACTION_CHECK_TTS_DATA} intent where the
* caller indicates to the TextToSpeech engine which specific sets of voice data to
* check for by sending an ArrayList<String> of the voices that are of interest.
* The format of each voice is: lang-COUNTRY-variant where COUNTRY and variant are
* optional (ie, "eng" or "eng-USA" or "eng-USA-FEMALE").
*/
public static final String EXTRA_CHECK_VOICE_DATA_FOR = "checkVoiceDataFor";
// extras for a TTS engine's data installation
/**
* Extra information received with the {@link #ACTION_TTS_DATA_INSTALLED} intent.
* It indicates whether the data files for the synthesis engine were successfully
* installed. The installation was initiated with the {@link #ACTION_INSTALL_TTS_DATA}
* intent. The possible values for this extra are
* {@link TextToSpeech#SUCCESS} and {@link TextToSpeech#ERROR}.
*/
public static final String EXTRA_TTS_DATA_INSTALLED = "dataInstalled";
// keys for the parameters passed with speak commands. Hidden keys are used internally
// to maintain engine state for each TextToSpeech instance.
/**
* @hide
*/
public static final String KEY_PARAM_RATE = "rate";
/**
* @hide
*/
public static final String KEY_PARAM_LANGUAGE = "language";
/**
* @hide
*/
public static final String KEY_PARAM_COUNTRY = "country";
/**
* @hide
*/
public static final String KEY_PARAM_VARIANT = "variant";
/**
* @hide
*/
public static final String KEY_PARAM_ENGINE = "engine";
/**
* @hide
*/
public static final String KEY_PARAM_PITCH = "pitch";
/**
* Parameter key to specify the audio stream type to be used when speaking text
* or playing back a file. The value should be one of the STREAM_ constants
* defined in {@link AudioManager}.
*
* @see TextToSpeech#speak(String, int, HashMap)
* @see TextToSpeech#playEarcon(String, int, HashMap)
*/
public static final String KEY_PARAM_STREAM = "streamType";
/**
* Parameter key to identify an utterance in the
* {@link TextToSpeech.OnUtteranceCompletedListener} after text has been
* spoken, a file has been played back or a silence duration has elapsed.
*
* @see TextToSpeech#speak(String, int, HashMap)
* @see TextToSpeech#playEarcon(String, int, HashMap)
* @see TextToSpeech#synthesizeToFile(String, HashMap, String)
*/
public static final String KEY_PARAM_UTTERANCE_ID = "utteranceId";
/**
* Parameter key to specify the speech volume relative to the current stream type
* volume used when speaking text. Volume is specified as a float ranging from 0 to 1
* where 0 is silence, and 1 is the maximum volume (the default behavior).
*
* @see TextToSpeech#speak(String, int, HashMap)
* @see TextToSpeech#playEarcon(String, int, HashMap)
*/
public static final String KEY_PARAM_VOLUME = "volume";
/**
* Parameter key to specify how the speech is panned from left to right when speaking text.
* Pan is specified as a float ranging from -1 to +1 where -1 maps to a hard-left pan,
* 0 to center (the default behavior), and +1 to hard-right.
*
* @see TextToSpeech#speak(String, int, HashMap)
* @see TextToSpeech#playEarcon(String, int, HashMap)
*/
public static final String KEY_PARAM_PAN = "pan";
}
private final Context mContext;
private Connection mServiceConnection;
private OnInitListener mInitListener;
private final Object mStartLock = new Object();
private String mRequestedEngine;
private final Map<String, Uri> mEarcons;
private final Map<String, Uri> mUtterances;
private final Bundle mParams = new Bundle();
private String mCurrentEngine = null;
/**
* The constructor for the TextToSpeech class, using the default TTS engine.
* This will also initialize the associated TextToSpeech engine if it isn't already running.
*
* @param context
* The context this instance is running in.
* @param listener
* The {@link TextToSpeech.OnInitListener} that will be called when the
* TextToSpeech engine has initialized.
*/
public TextToSpeech(Context context, OnInitListener listener) {
this(context, listener, null);
}
/**
* The constructor for the TextToSpeech class, using the given TTS engine.
* This will also initialize the associated TextToSpeech engine if it isn't already running.
*
* @param context
* The context this instance is running in.
* @param listener
* The {@link TextToSpeech.OnInitListener} that will be called when the
* TextToSpeech engine has initialized.
* @param engine Package name of the TTS engine to use.
*/
public TextToSpeech(Context context, OnInitListener listener, String engine) {
mContext = context;
mInitListener = listener;
mRequestedEngine = engine;
mEarcons = new HashMap<String, Uri>();
mUtterances = new HashMap<String, Uri>();
initTts();
}
private String getPackageName() {
return mContext.getPackageName();
}
private <R> R runActionNoReconnect(Action<R> action, R errorResult, String method) {
return runAction(action, errorResult, method, false);
}
private <R> R runAction(Action<R> action, R errorResult, String method) {
return runAction(action, errorResult, method, true);
}
private <R> R runAction(Action<R> action, R errorResult, String method, boolean reconnect) {
synchronized (mStartLock) {
if (mServiceConnection == null) {
Log.w(TAG, method + " failed: not bound to TTS engine");
return errorResult;
}
return mServiceConnection.runAction(action, errorResult, method, reconnect);
}
}
private int initTts() {
String defaultEngine = getDefaultEngine();
String engine = defaultEngine;
if (!areDefaultsEnforced() && !TextUtils.isEmpty(mRequestedEngine)
&& isEngineEnabled(engine)) {
engine = mRequestedEngine;
}
// Try requested engine
if (connectToEngine(engine)) {
return SUCCESS;
}
// Fall back to user's default engine if different from the already tested one
if (!engine.equals(defaultEngine)) {
if (connectToEngine(defaultEngine)) {
return SUCCESS;
}
}
// Fall back to the hardcoded default if different from the two above
if (!defaultEngine.equals(Engine.DEFAULT_ENGINE)
&& !engine.equals(Engine.DEFAULT_ENGINE)) {
if (connectToEngine(Engine.DEFAULT_ENGINE)) {
return SUCCESS;
}
}
return ERROR;
}
private boolean connectToEngine(String engine) {
Connection connection = new Connection();
Intent intent = new Intent(Engine.INTENT_ACTION_TTS_SERVICE);
intent.setPackage(engine);
boolean bound = mContext.bindService(intent, connection, Context.BIND_AUTO_CREATE);
if (!bound) {
Log.e(TAG, "Failed to bind to " + engine);
dispatchOnInit(ERROR);
return false;
} else {
mCurrentEngine = engine;
return true;
}
}
private void dispatchOnInit(int result) {
synchronized (mStartLock) {
if (mInitListener != null) {
mInitListener.onInit(result);
mInitListener = null;
}
}
}
/**
* Releases the resources used by the TextToSpeech engine.
* It is good practice for instance to call this method in the onDestroy() method of an Activity
* so the TextToSpeech engine can be cleanly stopped.
*/
public void shutdown() {
runActionNoReconnect(new Action<Void>() {
@Override
public Void run(ITextToSpeechService service) throws RemoteException {
service.setCallback(getPackageName(), null);
service.stop(getPackageName());
mServiceConnection.disconnect();
return null;
}
}, null, "shutdown");
}
/**
* Adds a mapping between a string of text and a sound resource in a
* package. After a call to this method, subsequent calls to
* {@link #speak(String, int, HashMap)} will play the specified sound resource
* if it is available, or synthesize the text it is missing.
*
* @param text
* The string of text. Example: <code>"south_south_east"</code>
*
* @param packagename
* Pass the packagename of the application that contains the
* resource. If the resource is in your own application (this is
* the most common case), then put the packagename of your
* application here.<br/>
* Example: <b>"com.google.marvin.compass"</b><br/>
* The packagename can be found in the AndroidManifest.xml of
* your application.
* <p>
* <code>&lt;manifest xmlns:android=&quot;...&quot;
* package=&quot;<b>com.google.marvin.compass</b>&quot;&gt;</code>
* </p>
*
* @param resourceId
* Example: <code>R.raw.south_south_east</code>
*
* @return Code indicating success or failure. See {@link #ERROR} and {@link #SUCCESS}.
*/
public int addSpeech(String text, String packagename, int resourceId) {
synchronized (mStartLock) {
mUtterances.put(text, makeResourceUri(packagename, resourceId));
return SUCCESS;
}
}
/**
* Adds a mapping between a string of text and a sound file. Using this, it
* is possible to add custom pronounciations for a string of text.
* After a call to this method, subsequent calls to {@link #speak(String, int, HashMap)}
* will play the specified sound resource if it is available, or synthesize the text it is
* missing.
*
* @param text
* The string of text. Example: <code>"south_south_east"</code>
* @param filename
* The full path to the sound file (for example:
* "/sdcard/mysounds/hello.wav")
*
* @return Code indicating success or failure. See {@link #ERROR} and {@link #SUCCESS}.
*/
public int addSpeech(String text, String filename) {
synchronized (mStartLock) {
mUtterances.put(text, Uri.parse(filename));
return SUCCESS;
}
}
/**
* Adds a mapping between a string of text and a sound resource in a
* package. Use this to add custom earcons.
*
* @see #playEarcon(String, int, HashMap)
*
* @param earcon The name of the earcon.
* Example: <code>"[tick]"</code><br/>
*
* @param packagename
* the package name of the application that contains the
* resource. This can for instance be the package name of your own application.
* Example: <b>"com.google.marvin.compass"</b><br/>
* The package name can be found in the AndroidManifest.xml of
* the application containing the resource.
* <p>
* <code>&lt;manifest xmlns:android=&quot;...&quot;
* package=&quot;<b>com.google.marvin.compass</b>&quot;&gt;</code>
* </p>
*
* @param resourceId
* Example: <code>R.raw.tick_snd</code>
*
* @return Code indicating success or failure. See {@link #ERROR} and {@link #SUCCESS}.
*/
public int addEarcon(String earcon, String packagename, int resourceId) {
synchronized(mStartLock) {
mEarcons.put(earcon, makeResourceUri(packagename, resourceId));
return SUCCESS;
}
}
/**
* Adds a mapping between a string of text and a sound file.
* Use this to add custom earcons.
*
* @see #playEarcon(String, int, HashMap)
*
* @param earcon
* The name of the earcon.
* Example: <code>"[tick]"</code>
* @param filename
* The full path to the sound file (for example:
* "/sdcard/mysounds/tick.wav")
*
* @return Code indicating success or failure. See {@link #ERROR} and {@link #SUCCESS}.
*/
public int addEarcon(String earcon, String filename) {
synchronized(mStartLock) {
mEarcons.put(earcon, Uri.parse(filename));
return SUCCESS;
}
}
private Uri makeResourceUri(String packageName, int resourceId) {
return new Uri.Builder()
.scheme(ContentResolver.SCHEME_ANDROID_RESOURCE)
.encodedAuthority(packageName)
.appendEncodedPath(String.valueOf(resourceId))
.build();
}
/**
* Speaks the string using the specified queuing strategy and speech
* parameters.
*
* @param text The string of text to be spoken.
* @param queueMode The queuing strategy to use, {@link #QUEUE_ADD} or {@link #QUEUE_FLUSH}.
* @param params Parameters for the request. Can be null.
* Supported parameter names:
* {@link Engine#KEY_PARAM_STREAM},
* {@link Engine#KEY_PARAM_UTTERANCE_ID},
* {@link Engine#KEY_PARAM_VOLUME},
* {@link Engine#KEY_PARAM_PAN}.
* Engine specific parameters may be passed in but the parameter keys
* must be prefixed by the name of the engine they are intended for. For example
* the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the
* engine named "com.svox.pico" if it is being used.
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int speak(final String text, final int queueMode, final HashMap<String, String> params) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
Uri utteranceUri = mUtterances.get(text);
if (utteranceUri != null) {
return service.playAudio(getPackageName(), utteranceUri, queueMode,
getParams(params));
} else {
return service.speak(getPackageName(), text, queueMode, getParams(params));
}
}
}, ERROR, "speak");
}
/**
* Plays the earcon using the specified queueing mode and parameters.
* The earcon must already have been added with {@link #addEarcon(String, String)} or
* {@link #addEarcon(String, String, int)}.
*
* @param earcon The earcon that should be played
* @param queueMode {@link #QUEUE_ADD} or {@link #QUEUE_FLUSH}.
* @param params Parameters for the request. Can be null.
* Supported parameter names:
* {@link Engine#KEY_PARAM_STREAM},
* {@link Engine#KEY_PARAM_UTTERANCE_ID}.
* Engine specific parameters may be passed in but the parameter keys
* must be prefixed by the name of the engine they are intended for. For example
* the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the
* engine named "com.svox.pico" if it is being used.
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int playEarcon(final String earcon, final int queueMode,
final HashMap<String, String> params) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
Uri earconUri = mEarcons.get(earcon);
if (earconUri == null) {
return ERROR;
}
return service.playAudio(getPackageName(), earconUri, queueMode,
getParams(params));
}
}, ERROR, "playEarcon");
}
/**
* Plays silence for the specified amount of time using the specified
* queue mode.
*
* @param durationInMs The duration of the silence.
* @param queueMode {@link #QUEUE_ADD} or {@link #QUEUE_FLUSH}.
* @param params Parameters for the request. Can be null.
* Supported parameter names:
* {@link Engine#KEY_PARAM_UTTERANCE_ID}.
* Engine specific parameters may be passed in but the parameter keys
* must be prefixed by the name of the engine they are intended for. For example
* the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the
* engine named "com.svox.pico" if it is being used.
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int playSilence(final long durationInMs, final int queueMode,
final HashMap<String, String> params) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
return service.playSilence(getPackageName(), durationInMs, queueMode,
getParams(params));
}
}, ERROR, "playSilence");
}
/**
* Checks whether the TTS engine is busy speaking.
*
* @return {@code true} if the TTS engine is speaking.
*/
public boolean isSpeaking() {
return runAction(new Action<Boolean>() {
@Override
public Boolean run(ITextToSpeechService service) throws RemoteException {
return service.isSpeaking();
}
}, false, "isSpeaking");
}
/**
* Interrupts the current utterance (whether played or rendered to file) and discards other
* utterances in the queue.
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int stop() {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
return service.stop(getPackageName());
}
}, ERROR, "stop");
}
/**
* Sets the speech rate.
*
* This has no effect on any pre-recorded speech.
*
* @param speechRate Speech rate. {@code 1.0} is the normal speech rate,
* lower values slow down the speech ({@code 0.5} is half the normal speech rate),
* greater values accelerate it ({@code 2.0} is twice the normal speech rate).
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int setSpeechRate(float speechRate) {
if (speechRate > 0.0f) {
int intRate = (int)(speechRate * 100);
if (intRate > 0) {
synchronized (mStartLock) {
mParams.putInt(Engine.KEY_PARAM_RATE, intRate);
}
return SUCCESS;
}
}
return ERROR;
}
/**
* Sets the speech pitch for the TextToSpeech engine.
*
* This has no effect on any pre-recorded speech.
*
* @param pitch Speech pitch. {@code 1.0} is the normal pitch,
* lower values lower the tone of the synthesized voice,
* greater values increase it.
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int setPitch(float pitch) {
if (pitch > 0.0f) {
int intPitch = (int)(pitch * 100);
if (intPitch > 0) {
synchronized (mStartLock) {
mParams.putInt(Engine.KEY_PARAM_PITCH, intPitch);
}
return SUCCESS;
}
}
return ERROR;
}
/**
* Sets the text-to-speech language.
* The TTS engine will try to use the closest match to the specified
* language as represented by the Locale, but there is no guarantee that the exact same Locale
* will be used. Use {@link #isLanguageAvailable(Locale)} to check the level of support
* before choosing the language to use for the next utterances.
*
* @param loc The locale describing the language to be used.
*
* @return Code indicating the support status for the locale. See {@link #LANG_AVAILABLE},
* {@link #LANG_COUNTRY_AVAILABLE}, {@link #LANG_COUNTRY_VAR_AVAILABLE},
* {@link #LANG_MISSING_DATA} and {@link #LANG_NOT_SUPPORTED}.
*/
public int setLanguage(final Locale loc) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
if (loc == null) {
return LANG_NOT_SUPPORTED;
}
String language = loc.getISO3Language();
String country = loc.getISO3Country();
String variant = loc.getVariant();
// Check if the language, country, variant are available, and cache
// the available parts.
// Note that the language is not actually set here, instead it is cached so it
// will be associated with all upcoming utterances.
int result = service.loadLanguage(language, country, variant);
if (result >= LANG_AVAILABLE){
if (result < LANG_COUNTRY_VAR_AVAILABLE) {
variant = "";
if (result < LANG_COUNTRY_AVAILABLE) {
country = "";
}
}
mParams.putString(Engine.KEY_PARAM_LANGUAGE, language);
mParams.putString(Engine.KEY_PARAM_COUNTRY, country);
mParams.putString(Engine.KEY_PARAM_VARIANT, variant);
}
return result;
}
}, LANG_NOT_SUPPORTED, "setLanguage");
}
/**
* Returns a Locale instance describing the language currently being used by the TextToSpeech
* engine.
*
* @return language, country (if any) and variant (if any) used by the engine stored in a Locale
* instance, or {@code null} on error.
*/
public Locale getLanguage() {
return runAction(new Action<Locale>() {
@Override
public Locale run(ITextToSpeechService service) throws RemoteException {
String[] locStrings = service.getLanguage();
if (locStrings != null && locStrings.length == 3) {
return new Locale(locStrings[0], locStrings[1], locStrings[2]);
}
return null;
}
}, null, "getLanguage");
}
/**
* Checks if the specified language as represented by the Locale is available and supported.
*
* @param loc The Locale describing the language to be used.
*
* @return Code indicating the support status for the locale. See {@link #LANG_AVAILABLE},
* {@link #LANG_COUNTRY_AVAILABLE}, {@link #LANG_COUNTRY_VAR_AVAILABLE},
* {@link #LANG_MISSING_DATA} and {@link #LANG_NOT_SUPPORTED}.
*/
public int isLanguageAvailable(final Locale loc) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
return service.isLanguageAvailable(loc.getISO3Language(),
loc.getISO3Country(), loc.getVariant());
}
}, LANG_NOT_SUPPORTED, "isLanguageAvailable");
}
/**
* Synthesizes the given text to a file using the specified parameters.
*
* @param text Thetext that should be synthesized
* @param params Parameters for the request. Can be null.
* Supported parameter names:
* {@link Engine#KEY_PARAM_UTTERANCE_ID}.
* Engine specific parameters may be passed in but the parameter keys
* must be prefixed by the name of the engine they are intended for. For example
* the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the
* engine named "com.svox.pico" if it is being used.
* @param filename Absolute file filename to write the generated audio data to.It should be
* something like "/sdcard/myappsounds/mysound.wav".
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int synthesizeToFile(final String text, final HashMap<String, String> params,
final String filename) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
return service.synthesizeToFile(getPackageName(), text, filename,
getParams(params));
}
}, ERROR, "synthesizeToFile");
}
private Bundle getParams(HashMap<String, String> params) {
if (params != null && !params.isEmpty()) {
Bundle bundle = new Bundle(mParams);
copyIntParam(bundle, params, Engine.KEY_PARAM_STREAM);
copyStringParam(bundle, params, Engine.KEY_PARAM_UTTERANCE_ID);
copyFloatParam(bundle, params, Engine.KEY_PARAM_VOLUME);
copyFloatParam(bundle, params, Engine.KEY_PARAM_PAN);
// Copy over all parameters that start with the name of the
// engine that we are currently connected to. The engine is
// free to interpret them as it chooses.
if (!TextUtils.isEmpty(mCurrentEngine)) {
for (Map.Entry<String, String> entry : params.entrySet()) {
final String key = entry.getKey();
if (key != null && key.startsWith(mCurrentEngine)) {
bundle.putString(key, entry.getValue());
}
}
}
return bundle;
} else {
return mParams;
}
}
private void copyStringParam(Bundle bundle, HashMap<String, String> params, String key) {
String value = params.get(key);
if (value != null) {
bundle.putString(key, value);
}
}
private void copyIntParam(Bundle bundle, HashMap<String, String> params, String key) {
String valueString = params.get(key);
if (!TextUtils.isEmpty(valueString)) {
try {
int value = Integer.parseInt(valueString);
bundle.putInt(key, value);
} catch (NumberFormatException ex) {
// don't set the value in the bundle
}
}
}
private void copyFloatParam(Bundle bundle, HashMap<String, String> params, String key) {
String valueString = params.get(key);
if (!TextUtils.isEmpty(valueString)) {
try {
float value = Float.parseFloat(valueString);
bundle.putFloat(key, value);
} catch (NumberFormatException ex) {
// don't set the value in the bundle
}
}
}
/**
* Sets the listener that will be notified when synthesis of an utterance completes.
*
* @param listener The listener to use.
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
public int setOnUtteranceCompletedListener(final OnUtteranceCompletedListener listener) {
return runAction(new Action<Integer>() {
@Override
public Integer run(ITextToSpeechService service) throws RemoteException {
ITextToSpeechCallback.Stub callback = new ITextToSpeechCallback.Stub() {
public void utteranceCompleted(String utteranceId) {
if (listener != null) {
listener.onUtteranceCompleted(utteranceId);
}
}
};
service.setCallback(getPackageName(), callback);
return SUCCESS;
}
}, ERROR, "setOnUtteranceCompletedListener");
}
/**
* Sets the TTS engine to use.
*
* @param enginePackageName The package name for the synthesis engine (e.g. "com.svox.pico")
*
* @return {@link #ERROR} or {@link #SUCCESS}.
*/
// TODO: add @Deprecated{This method does not tell the caller when the new engine
// has been initialized. You should create a new TextToSpeech object with the new
// engine instead.}
public int setEngineByPackageName(String enginePackageName) {
mRequestedEngine = enginePackageName;
return initTts();
}
/**
* Gets the package name of the default speech synthesis engine.
*
* @return Package name of the TTS engine that the user has chosen as their default.
*/
public String getDefaultEngine() {
String engine = Settings.Secure.getString(mContext.getContentResolver(),
Settings.Secure.TTS_DEFAULT_SYNTH);
return engine != null ? engine : Engine.DEFAULT_ENGINE;
}
/**
* Checks whether the user's settings should override settings requested by the calling
* application.
*/
public boolean areDefaultsEnforced() {
return Settings.Secure.getInt(mContext.getContentResolver(),
Settings.Secure.TTS_USE_DEFAULTS, Engine.USE_DEFAULTS) == 1;
}
private boolean isEngineEnabled(String engine) {
if (Engine.DEFAULT_ENGINE.equals(engine)) {
return true;
}
for (String enabled : getEnabledEngines()) {
if (engine.equals(enabled)) {
return true;
}
}
return false;
}
private String[] getEnabledEngines() {
String str = Settings.Secure.getString(mContext.getContentResolver(),
Settings.Secure.TTS_ENABLED_PLUGINS);
if (TextUtils.isEmpty(str)) {
return new String[0];
}
return str.split(" ");
}
/**
* Gets a list of all installed TTS engines.
*
* @return A list of engine info objects. The list can be empty, but will never by {@code null}.
*/
public List<EngineInfo> getEngines() {
PackageManager pm = mContext.getPackageManager();
Intent intent = new Intent(Engine.INTENT_ACTION_TTS_SERVICE);
List<ResolveInfo> resolveInfos =
pm.queryIntentServices(intent, PackageManager.MATCH_DEFAULT_ONLY);
if (resolveInfos == null) return Collections.emptyList();
List<EngineInfo> engines = new ArrayList<EngineInfo>(resolveInfos.size());
for (ResolveInfo resolveInfo : resolveInfos) {
ServiceInfo service = resolveInfo.serviceInfo;
if (service != null) {
EngineInfo engine = new EngineInfo();
// Using just the package name isn't great, since it disallows having
// multiple engines in the same package, but that's what the existing API does.
engine.name = service.packageName;
CharSequence label = service.loadLabel(pm);
engine.label = TextUtils.isEmpty(label) ? engine.name : label.toString();
engine.icon = service.getIconResource();
engines.add(engine);
}
}
return engines;
}
private class Connection implements ServiceConnection {
private ITextToSpeechService mService;
public void onServiceConnected(ComponentName name, IBinder service) {
Log.i(TAG, "Connected to " + name);
synchronized(mStartLock) {
if (mServiceConnection != null) {
// Disconnect any previous service connection
mServiceConnection.disconnect();
}
mServiceConnection = this;
mService = ITextToSpeechService.Stub.asInterface(service);
dispatchOnInit(SUCCESS);
}
}
public void onServiceDisconnected(ComponentName name) {
synchronized(mStartLock) {
mService = null;
// If this is the active connection, clear it
if (mServiceConnection == this) {
mServiceConnection = null;
}
}
}
public void disconnect() {
mContext.unbindService(this);
}
public <R> R runAction(Action<R> action, R errorResult, String method, boolean reconnect) {
try {
synchronized (mStartLock) {
if (mService == null) {
Log.w(TAG, method + " failed: not connected to TTS engine");
return errorResult;
}
return action.run(mService);
}
} catch (RemoteException ex) {
Log.e(TAG, method + " failed", ex);
if (reconnect) {
disconnect();
initTts();
}
return errorResult;
}
}
}
private interface Action<R> {
R run(ITextToSpeechService service) throws RemoteException;
}
/**
* Information about an installed text-to-speech engine.
*
* @see TextToSpeech#getEngines
*/
public static class EngineInfo {
/**
* Engine package name..
*/
public String name;
/**
* Localized label for the engine.
*/
public String label;
/**
* Icon for the engine.
*/
public int icon;
@Override
public String toString() {
return "EngineInfo{name=" + name + "}";
}
}
}